WO2010090107A1 - 吸収体の製造装置、及び通気性部材の製造方法 - Google Patents
吸収体の製造装置、及び通気性部材の製造方法 Download PDFInfo
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- WO2010090107A1 WO2010090107A1 PCT/JP2010/051021 JP2010051021W WO2010090107A1 WO 2010090107 A1 WO2010090107 A1 WO 2010090107A1 JP 2010051021 W JP2010051021 W JP 2010051021W WO 2010090107 A1 WO2010090107 A1 WO 2010090107A1
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- WIPO (PCT)
- Prior art keywords
- wire
- breathable
- reinforcing member
- breathable member
- wires
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Ceased
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
- B32B37/14—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F13/00—Bandages or dressings; Absorbent pads
- A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
- A61F13/15577—Apparatus or processes for manufacturing
- A61F13/15617—Making absorbent pads from fibres or pulverulent material with or without treatment of the fibres
- A61F13/15626—Making fibrous pads without outer layers
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F13/00—Bandages or dressings; Absorbent pads
- A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
- A61F13/15577—Apparatus or processes for manufacturing
- A61F13/15617—Making absorbent pads from fibres or pulverulent material with or without treatment of the fibres
- A61F13/15658—Forming continuous, e.g. composite, fibrous webs, e.g. involving the application of pulverulent material on parts thereof
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F13/00—Bandages or dressings; Absorbent pads
- A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
- A61F13/53—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium
Definitions
- the present invention relates to a manufacturing apparatus for an absorbent body related to an absorbent article such as a disposable diaper, and a manufacturing method for a breathable member provided in the manufacturing apparatus to mold the absorbent body.
- Disposable diapers, sanitary napkins and the like are used as examples of absorbent articles that absorb excreted fluid such as urine and menstrual blood.
- absorbent articles include an absorbent body formed by molding pulp fibers as an example of a liquid absorbent material into a predetermined shape.
- the absorber 1 is molded by the fiber stacking device 10 in the production line (see FIG. 1).
- the fiber stacking apparatus 10 has a rotating drum 20. Then, while rotating the rotating drum 20 in the circumferential direction Dc, the mixed air 3 mixed with the pulp fibers 2 is supplied toward the outer peripheral surface 20a, and the pulp fibers 2 are transferred to the concave mold 21 of the outer peripheral surface 20a. After the lamination, the laminated pulp fiber 2 is released from the mold 21 to form the absorbent body 1.
- the molding die 21 is configured, for example, by stretching a wire net or the like as a breathable member 50 from the inside of the rotating drum 20 to an opening 27a formed on the outer peripheral surface 20a of the rotating drum 20.
- the mixed air 3 is sucked from the outside of the rotary drum 20 to the inside through the wire mesh 50, and the pulp fibers 2 are laminated on the wire mesh 50.
- the pulp fibers 2 stacked in the mold 21 are taken out as the absorber 1. .
- the wire mesh 50 receives external forces opposite to each other at the time of lamination and release, that is, every time one absorber 1 is formed, the wire mesh 50 is repeatedly forced to undergo deformation that reverses the bending direction.
- the wire mesh 50 is made of a thin wire, and its strength is weak. When an external force in both forward and reverse directions is repeatedly applied, there is a risk of fatigue failure. Therefore, in order to suppress deformation of the wire mesh 50, a wire mesh 50 to which a reinforcing member is joined is disclosed (see, for example, Patent Document 1).
- this Patent Document 1 does not describe which part of the reinforcing member is joined to the wire mesh 50.
- the above-described external force that acts on the wire mesh 50 at the time of lamination and mold release causes the reinforcement member to The low-rigidity part is easily deformed, and the reinforcing member itself may be fatigued and destroyed, so that the expected reinforcing effect may not be obtained. That is, there is a possibility that deformation of the wire mesh 50 cannot be effectively suppressed.
- the present invention has been made in view of the above-described conventional problems, and an object thereof is to reliably reinforce a gas-permeable member such as a wire mesh by a reinforcing member and suppress deformation thereof.
- the main invention for achieving the above object is: An absorbent body according to an absorbent article by laminating the liquid absorbent material on the breathable member by passing a gas containing the liquid absorbent material in the thickness direction of the breathable member covering the opening of the mold member; An apparatus for manufacturing A reinforcing member that reinforces the breathable member by being superimposed on the breathable member in the thickness direction;
- the reinforcing member is a mesh body formed by connecting the first wire and the second wire intersecting each other at the intersection point, In the intersection, the reinforcing member is joined to the breathable member.
- a method for producing a breathable member having at least one of convex portions The material of the breathable member is a member that regulates the passage of the liquid absorbent material in the thickness direction, The material of the reinforcing member is a mesh formed by connecting the first wire and the second wire intersecting each other at these intersections, While superposing the material of the breathable member and the material of the reinforcing member in the thickness direction, the material of the reinforcing member is used as the material of the breathable member at the intersection of the first wire and the second wire.
- the breathable member can be reliably reinforced by the reinforcing member, and the deformation can be effectively suppressed.
- FIG. 2 is an exploded perspective view of a rotary drum 20.
- FIG. 3 is an exploded perspective view of a mold plate 27.
- FIG. 4A is an enlarged plan view with a part of the air-permeable member 50 removed, and FIGS. 4B and 4C are a BB cross-sectional view and a CC cross-sectional view, respectively, in FIG. 4A.
- FIG. 5A is an explanatory diagram of the first embodiment, and is a plan view showing a part of the air permeable member 50 removed.
- FIGS. 5B and 5C are cross-sectional views taken along the line BB in FIG. 5A, respectively. It is CC sectional drawing.
- FIG. 6A is a plan view showing the positions where the concave portions 56a and the convex portions 56b are formed in the air-permeable member 50 and the reinforcing member 60
- FIG. 6B is a longitudinal sectional view taken along the line BB in FIG. 6A
- 7A and 7B are explanatory views of a modification of the first embodiment, and are longitudinal sectional views corresponding to a BB section and a CC section in FIG. 5A, respectively.
- FIG. 8A is an explanatory diagram of the second embodiment, and is a plan view showing a part of the air-permeable member 50a removed.
- FIGS. 8B and 8C are a cross-sectional view taken along the line BB in FIG. 8A, respectively. It is CC sectional drawing.
- FIG. 9A is a plan view showing the positions where the low density regions 57a and the recesses 57b of the air holes 51a are formed in the air permeable member 50a
- FIG. 9B is a longitudinal sectional view taken along the line BB in FIG. 9A
- FIG. 10A is an example of another embodiment, and is a plan view of a breathable member 50b or a reinforcing member 60b knitted in a twill weave.
- FIGS. 10B and 10C are respectively B- in FIG. 10A.
- FIG. 6 is a B sectional view and a CC sectional view. It is an example of other embodiment, Comprising: It is a top view of the reinforcement member 60b in which the 1st wire 61 and the 2nd wire 62 are not knitted.
- An absorbent body according to an absorbent article by laminating the liquid absorbent material on the breathable member by passing a gas containing the liquid absorbent material in the thickness direction of the breathable member covering the opening of the mold member
- An apparatus for manufacturing A reinforcing member that reinforces the breathable member by being superimposed on the breathable member in the thickness direction;
- the reinforcing member is a mesh body formed by connecting the first wire and the second wire intersecting each other at the intersection point, In the intersection, the reinforcing member is joined to the breathable member.
- the reinforcing member is joined to the breathable member at the intersection of the first wire and the second wire.
- the said intersection is a site
- the intersection can sufficiently resist the external force acting on the breathable member when the absorbent body is laminated, and the deformation of the breathable member is surely suppressed.
- the breathable member and the reinforcing member are joined and integrated at the intersection point, they are deformed substantially integrally. Therefore, the distance between the breathable member and the reinforcing member is easily kept constant. As a result, even if a liquid absorbent material is sandwiched between the breathable member and the reinforcing member, the liquid absorbing material is absorbed. The easy-to-remove material can be easily removed, and the mesh of the breathable member and the reinforcing member can be effectively prevented.
- An apparatus for manufacturing such an absorber It is desirable that the first wire and the second wire are connected at the intersection by knitting. According to the manufacturing apparatus of such an absorber, a 1st wire and a 2nd wire can be connected firmly.
- first wire and the second wire are joined at the intersection.
- the first wire and the second wire are joined together, so that the rigidity of the reinforcing member itself can be increased, and its deformation is suppressed, so that fatigue breakdown is difficult. Further, since the deformation of the mesh of the reinforcing member is suppressed, it is also effectively prevented that the liquid absorbent material is pinched and clogged with the mesh when the mesh is opened and closed.
- the breathable member is a mesh body formed by knitting a third wire and a fourth wire intersecting each other,
- the mesh of the breathable member is finer than the mesh of the reinforcing member,
- the intersections of the third wires and the fourth wires are arranged in correspondence with all the intersections of the reinforcing members existing in the opening, and the intersections of the reinforcing members and the corresponding third wires It is desirable that the point of intersection with the fourth wire is abutted.
- the intersections of the third wire and the fourth wire are arranged so as to correspond to all the intersections of the reinforcing members present in the openings of the mold member, Moreover, these corresponding intersections are abutted. Therefore, the highly rigid joining point where the intersecting points are abutted makes it possible to more reliably and effectively suppress the deformation of the air-permeable member over a wide range.
- the breathable member is a mesh body formed by knitting a third wire and a fourth wire intersecting each other,
- the breathable member and the reinforcing member have at least one of a concave portion and a convex portion formed by press molding in a state of being overlapped and joined to each other in the thickness direction,
- the first wires are arranged at a first pitch in the longitudinal direction of the second wires
- the second wires are arranged at a second pitch in the longitudinal direction of the first wires
- the longitudinal direction of the third wire and the longitudinal direction of the first wire are aligned
- the longitudinal direction of the fourth wire and the longitudinal direction of the second wire are aligned
- the third wire is arranged at a third pitch in the longitudinal direction of the fourth wire
- the fourth wires are arranged at a fourth pitch in the longitudinal direction of the third wires
- the first pitch is an integer multiple (twice or more) of the third pitch
- the second pitch is preferably an integer multiple (twice or more)
- the intersections of the breathable members can be reliably arranged with respect to all the intersections of the reinforcing members existing in the opening, and thereby the ventilation
- the deformation of the sex member is effectively suppressed over a wide range.
- the air permeable member has a concave portion and a convex portion formed by press molding, the absorbent body can be molded into a three-dimensional shape in which the basis weight (g / cm 2 ) of the absorbent body is locally varied.
- An apparatus for manufacturing such an absorber It is desirable that the third wire and the fourth wire are joined at the intersection of the third wire and the fourth wire. According to such an absorber manufacturing apparatus, since the third wire and the fourth wire are joined, the rigidity of the air-permeable member itself can be increased, the deformation thereof is suppressed, and the fatigue breakdown is difficult. Further, since the deformation of the mesh is also suppressed, it is effectively prevented that the liquid absorbent material is pinched and clogged with the opening and closing deformation of the mesh.
- the breathable member has a plate member as a main body, It is desirable that a vent hole extending in the thickness direction is formed through the plate member.
- the peripheral portion of the air hole is planar, and thereby the air hole is formed into the air hole. Clogging of liquid absorbent material is reduced.
- the liquid absorbent material is a granular material such as a superabsorbent polymer, clogging of the air holes can be effectively prevented.
- a breathable member is a knitted fabric, it is excellent in the design freedom of the shape of a vent hole and the arrangement position of a vent hole.
- the plate member has a low density region in the opening portion where the distribution density of the air holes is lower than the surrounding region.
- the plate member has a low density region where the distribution density of the air holes is low, and in the low density region, the number of joint points with the reinforcing member as compared with the surrounding region. Can be secured. Therefore, compared with the case where the distribution density of a ventilation hole is uniform over the whole area in the said opening part, joint strength with a reinforcement member can be raised more.
- the basis weight of the liquid absorbent material related to the low density region is relatively small compared to other regions, by setting the low density region, the absorber is made into a target three-dimensional shape. It can be easily built in.
- the bonding is desirably performed by diffusion bonding in an inert gas atmosphere.
- joining can be performed without using a brazing material such as solder or a welding rod. Therefore, the brazing material lump is not interposed in the mesh or the like, and as a result, the air permeability of the air permeable member or the reinforcing member can be maintained in a good state.
- diffusion bonding is performed in an inert gas atmosphere. Therefore, when forming the concave portion or the convex portion by press molding with respect to the breathable member and the reinforcing member that are joined and integrated, the breathable member and the reinforcing member are quickly maintained while maintaining the joined and integrated state. Can be plastically deformed. Therefore, it is possible to avoid problems such as disconnection from the breathable member at the intersection of the reinforcing members during press working.
- An apparatus for manufacturing such an absorber It has a cylindrical rotating drum that rotates continuously in one circumferential direction,
- the molding die member constitutes an outer peripheral surface of the rotating drum, and the inner space and the outer space of the rotating drum are communicated with each other by the breathable member so as to allow ventilation.
- a supply duct for supplying the gas from the outside toward the outer peripheral surface of the rotating drum is provided at the first position in the circumferential direction, and an internal space of the rotating drum corresponding to the first position is provided.
- the atmospheric pressure in the range is maintained in a negative pressure state lower than the external space, When the mold member passes through the first position, the gas in the supply duct is sucked into the internal space of the rotating drum through the air permeable member, and the air permeable member absorbs the gas.
- a release position for releasing the absorber from the air-permeable member is set at a position downstream of the first position in the circumferential direction, and the interior of the rotating drum corresponding to the release position is set. It is desirable that the atmospheric pressure in the space is maintained at or above the atmospheric pressure in the external space. According to such an apparatus for manufacturing an absorbent body, the above-described effects can be enjoyed effectively. That is, when the mold member passes through the first position, the breathable member receives a force drawn from the gas inward in the rotational radius direction of the rotary drum, while when passing through the mold release position. On the contrary, it receives a force drawn from the gas outward in the radial direction of the rotating drum.
- the breathable member may repeatedly receive an external force whose direction is reversed and may lead to fatigue failure.
- the breathable member is joined and integrated with a reinforcing member, and is joined to an intersection that is a particularly rigid portion of the reinforcing member. Therefore, the deformation of the breathable member when receiving the above-described external force is effectively suppressed, and as a result, fatigue failure is less likely to occur.
- a method for producing a breathable member having at least one of convex portions The material of the breathable member is a member that regulates the passage of the liquid absorbent material in the thickness direction, The material of the reinforcing member is a mesh formed by connecting the first wire and the second wire intersecting each other at these intersections, While superposing the material of the breathable member and the material of the reinforcing member in the thickness direction, the material of the reinforcing member is used as the material of the breathable member at the intersection of the first wire and the second wire.
- the concave portion and the convex portion are formed by pressing. Therefore, when the procedure is reversed, that is, compared to the case where the concave portion and the convex portion are formed on the breathable member and the reinforcing member, respectively, and then the breathable member and the reinforcing member are overlapped and joined. Further, it is possible to prevent poor polymerization due to poor molding accuracy of the concave portions and convex portions, and as a result, it is possible to reliably prevent poor bonding between the breathable member and the reinforcing member.
- diffusion bonding between the breathable member and the reinforcing member is performed in an inert gas atmosphere. Therefore, when pressing the concave portion or the convex portion with respect to the breathable member and the reinforcing member that are joined and integrated, the breathable member and the reinforcing member are quickly plasticized while maintaining the joined and integrated state. Deformable. Therefore, it is possible to avoid problems such as disconnection from the breathable member at the intersection of the reinforcing members during press working.
- the reinforcing member is a mesh body formed by knitting the first wire and the second wire
- the breathable member is a mesh body formed by knitting a third wire and a fourth wire intersecting each other
- the first wire and the second wire are diffusion-bonded at the intersection of the first wire and the second wire
- the third wire and the fourth wire are diffusion-bonded at the intersection of the third wire and the fourth wire.
- the reinforcing member is a knitted fabric in which the first wire and the second wire are knitted.
- the first wire and the second wire forming the knitted material are joined, so that the rigidity of the reinforcing member itself can be increased and the deformation thereof is suppressed, and the fatigue breakage is difficult. Further, since the deformation of the mesh of the reinforcing member is suppressed, it is also effectively prevented that the liquid absorbent material is pinched and clogged with the mesh when the mesh is opened and closed.
- the breathable member is also a knitted fabric, and the third wire and the fourth wire forming the knitted fabric are joined in the joining and integrating step. Therefore, the rigidity of the air-permeable member itself can be increased, the deformation thereof is suppressed, and the fatigue breakage is difficult. Further, since the deformation of the mesh is also suppressed, it is effectively prevented that the liquid absorbent material is pinched and clogged with the opening and closing deformation of the mesh. Furthermore, by applying diffusion bonding, bonding can be performed without using a brazing material. Therefore, the air permeability of the air permeable member or the reinforcing member can be maintained in a good state without the brazing material lump intervening in the mesh or the like.
- FIG. 1 is a central longitudinal sectional view of an example of a manufacturing apparatus 10 for the absorbent body 1.
- the manufacturing apparatus 10 for the absorbent body 1 is a so-called fiber stacking apparatus that forms the absorbent body 1 by laminating pulp fibers 2 as liquid absorbent materials.
- a rotating drum 20 that continuously rotates in one direction of the circumferential direction Dc (for example, clockwise) around a horizontal axis C20 as a rotation center
- a circumference of the rotating drum 20 Supply that supplies and supplies mixed air 3 (corresponding to gas) containing pulp fibers 2 toward the outer peripheral surface 20a of the rotary drum 20 from a supply opening 31a arranged at a predetermined position (corresponding to the first position) in the direction Dc
- a suction conveyor 41 that is arranged downstream of the supply duct 31 in the circumferential direction Dc and sucks and conveys the absorber 1 from the molding die 21 on the outer circumferential surface 20a of the rotary drum 20 And.
- circumferential direction Dc of the rotating drum 20 is simply referred to as “circumferential direction”, and the direction along the horizontal axis C20 of the rotating drum 20 (the direction penetrating the paper surface of FIG. 1) is “ It is called “width direction” or “left-right direction”.
- the rotating drum 20 is a substantially cylindrical body, and a concave mold 21 corresponding to the shape of the absorbent body 1 to be molded is intermittently provided on the outer circumferential surface 20a at a predetermined pitch in the circumferential direction Dc. .
- a breathable member 50 is provided as a bottom surface of each mold 21, and the inside of the mold 21 communicates with the inside of the rotary drum 20 through the vent hole 51 of the breathable member 50 so as to allow ventilation.
- a cylindrical partition wall 22 a concentric with the rotating drum 20 is provided inside the rotating drum 20, whereby a donut-shaped substantially closed space S is partitioned on the inner peripheral side of the rotating drum 20.
- the substantially closed space S is divided into zones in the circumferential direction Dc by a plurality of partition walls 22b.
- the first zone Z1 shown in FIG. 1 is maintained in a negative pressure state lower than the external pressure
- the second zone Z2 on the downstream side is maintained at the same or slightly higher pressure than the external pressure.
- the supply opening 31a of the supply duct 31 is arranged corresponding to the first zone Z1, while the suction conveyor 41 is arranged corresponding to the second zone Z2.
- the absorbent body 1 is formed as follows. First, when the molding die 21 passes the position of the supply duct 31 due to the rotation of the rotary drum 20, only the substantially air of the mixed air 3 discharged and supplied from the supply opening 31 a is the bottom surface of the molding die 21. Thus, the pulp fiber 2 in the mixed air 3 is laminated on the breathable member 50. When the molding die 21 has passed through the position of the supply opening 31 a and reaches a position facing the suction conveyor 41, the pulp fibers 2 of the molding die 21 are sucked outward by the intake air from the suction conveyor 41. Then, the mold is released from the mold 21 in succession, and is thereafter conveyed by the suction conveyor 41 as the absorbent body 1.
- a polymer charging pipe (not shown) may be provided in the supply duct 31, and the superabsorbent polymer may be discharged from the charging port toward the outer peripheral surface 20a.
- the superabsorbent polymer also corresponds to the liquid absorbent material.
- FIG. 2 is an exploded perspective view of the rotary drum 20.
- the rotating drum 20 includes a pair of ring members 23, 23 arranged side by side in the width direction, and a plurality of ring members 23, 23 connected to each other in a state where a space is maintained between the ring members 23, 23. And a plurality of mold plates 27 (corresponding to mold members) spanning between the connection plates 25, 25 adjacent to each other at an appropriate pitch in the circumferential direction Dc and forming the outer peripheral surface 20a of the rotary drum 20. ) And.
- the pair of ring members 23, 23 are the same shape of a circular ring.
- the circular wall 24 of the shape similar to the perfect circle shape of the ring member 23 is each obstruct
- the aforementioned substantially closed space S is defined inside the ring members 23 and 23.
- the molding die plate 27 has an arcuate plate 27 having a length obtained by equally dividing the circumference of the outer peripheral surface 20a of the rotary drum 20 by the number of molding die 21 to be provided (here, seven), and the arcuate plate 27
- An opening 27a having a shape corresponding to the molded shape of the absorber 1 is formed at the center of the plane.
- the opening 27 a is covered with a breathable member 50 from the inside of the rotary drum 20, and the breathable member 50 is made of the pulp fiber 2.
- the breathable member 50 is fixed by welding or the like continuously or intermittently over the entire periphery of the peripheral portion of the opening 27a.
- one opening 27a forming the mold 21 is formed for each mold plate 27.
- the present invention is not limited to this.
- the opening 27a is formed for each mold plate 27. Two or more may be formed.
- the connecting plate 25 is, for example, a strip that is long in the width direction of the rotary drum 20. And it arrange
- FIGS. 4A to 4C are explanatory diagrams of the air-permeable member 50 according to the present invention.
- 4A is an enlarged plan view showing a part of the air-permeable member 50 while removing a part thereof
- FIGS. 4B and 4C are a BB sectional view and a CC sectional view in FIG. 4A, respectively.
- the air holes 51 of the air permeable member 50 are omitted in order to prevent complication of the drawings.
- the air-permeable member 50 has a plurality of air holes 51 (not shown in FIGS. 4A to 4C) penetrating along the thickness direction.
- the air holes 51 allow the passage of air in the thickness direction, but restrict the passage of the pulp fibers 2.
- An example of the air-permeable member 50 includes a wire mesh described later. A specific example of the breathable member 50 will be described later.
- the breathable member 50 is reinforced over almost the entire surface of one side of the breathable member 50 (the surface opposite to the surface on which the absorber 1 is laminated when attached to the rotating drum 20).
- the reinforcing members 60 to be overlapped are joined together.
- a mesh body formed by connecting the first wire 61 and the second wire 62 that intersect each other at the intersection CP60 is used.
- the reason why the mesh body is used is that the air permeability of the air permeable member 50 is not hindered.
- the first wire 61 and the second wire 62 are knitted.
- “knitted” means that the positional relationship between the first wire 61 and the second wire 62 is changed at every other intersection point CP60 or every plurality of intersection points CP60 in the thickness direction. Says the state of matching. And by being knitted, the first wire 61 and the second wire 62 are firmly connected at the intersection CP60.
- Such joining of the reinforcing member 60 and the air permeable member 50 is performed at the intersection CP 60 of the first wire 61 and the second wire 62.
- the intersection CP60 is a relatively high-rigidity portion as much as they are connected to each other, rather than only the first wire 61 or the second wire 62 alone. Therefore, the intersection CP60 can sufficiently resist the suction force acting on the breathable member 50 when the absorbent body 1 is laminated or released, and the deformation of the breathable member 50 is reliably suppressed. Further, since the air-permeable member 50 and the reinforcing member 60 are joined and integrated at the intersection point CP60, they are deformed substantially integrally.
- the distance between the air permeable member 50 and the reinforcing member 60 is easily kept constant.
- the pulp fiber 2 is temporarily sandwiched between the air permeable member 50 and the reinforcing member 60.
- the pulp fibers 2 are easy to come off, and the clogging of the air holes 51 of the air permeable member 50 and the mesh of the reinforcing member 60 is effectively prevented.
- the reinforcing member 60 it is most desirable to join the reinforcing member 60 to the air permeable member 50 at all the intersection points CP60 existing in the opening 27a of the mold plate 27, but more than half of the intersection points CP60 may be used. There may be more than one, and moreover, even one can provide a reinforcing effect.
- the planar dimensions of the vent holes 51 (mesh in the case of a metal mesh) of the breathable member 50 can be appropriately selected according to the size of the liquid absorbent material such as the pulp fiber 2 or the superabsorbent polymer, but preferably
- the opening area is preferably in the range of 0.01 to 1 mm 2 . This is because when the pressure is less than 0.01 mm 2 , the pressure loss increases, the suction power required at the time of laminating and releasing is increased and the pulp fiber 2 is likely to be clogged, whereas it exceeds 1 mm 2. This is because the trapping ability of the pulp fiber 2 is lowered.
- the opening area of the mesh of the reinforcing member 60 is larger than the opening area of the vent hole 51 of the breathable member 50.
- the breathable member 50 provided by providing the reinforcing member 60 A decrease in air permeability can be effectively suppressed.
- the breathable member 50 and the reinforcing member 60 will be described in detail while showing specific examples.
- FIG. 5A is a plan view showing a part of the air permeable member 50 removed
- FIGS. 5B and 5C are a BB sectional view and a CC sectional view in FIG. 5A, respectively.
- the air-permeable member 50 is a mesh body formed by knitting a third wire 53 and a fourth wire 54 that intersect each other, and more specifically, a plain weave wire mesh.
- the mesh functions as the vent hole 51 described above.
- the reinforcing member 60 is a plain weave wire net formed by knitting a first wire 61 and a second wire 62 having a larger wire diameter than the third and fourth wires 53 and 54.
- both wire meshes are made of a metal wire such as stainless steel (SUS304 in this example).
- a non-metal such as a resin may be used as long as it has a certain degree of rigidity and strength. . From the viewpoint of bonding properties, it is desirable that the breathable member 50 and the reinforcing member 60 are made of the same material.
- plain weaving is a weaving method in which vertical and horizontal wires are alternately crossed one by one.
- the third wire 53 is a vertical wire along the circumferential direction Dc of the rotary drum 20
- the fourth wire 54 is a horizontal wire along the width direction of the rotary drum 20.
- These vertical wires and horizontal wires are orthogonal to each other at the intersection CP50.
- the reinforcing member 60 the first wire 61 is arranged as a vertical wire and the second wire 62 is arranged as a horizontal wire, and the vertical wire and the horizontal wire are orthogonal to each other at an intersection CP60.
- the third wires 53 are arranged at the third pitch P3 in the longitudinal direction of the fourth wires 54, and the fourth wires 54 are arranged at the fourth pitch P4 in the longitudinal direction of the third wires 53.
- the third pitch P3 and the fourth pitch P4 are set to be the same size, so that the mesh 51 has a square shape.
- the first wires 61 are arranged at the first pitch P1 in the longitudinal direction of the second wires 62, and the second wires 62 are arranged at the second pitch P2 in the longitudinal direction of the first wires 61.
- the first pitch P1 and the second pitch P2 are set to the same size, and the mesh shape is square.
- the wire diameter is 0.27 mm
- the third pitch P3 and the fourth pitch P4 are pitches corresponding to 40 lines / inch
- the aperture ratio (the unit plane area occupying the unit plane area of the air-permeable member 50).
- the air permeable member 50 having a pore 51 (mesh) opening area ratio) of 33%
- the wire diameter is 0.9 mm
- the first pitch P1 and the second pitch P2 are pitches corresponding to 4 / inch
- a breathable member having a wire diameter of 0.12 mm, a third pitch P3 and a fourth pitch P4 corresponding to 80 lines / inch, and an aperture ratio of 38.7%.
- 50 and a reinforcing member 60 having a wire diameter of 0.9 mm, a pitch corresponding to 4 / inch of the first pitch P1 and the second pitch P2, and an aperture ratio of 73.7%.
- the first pitch P1 that is the arrangement pitch of the vertical wires of the reinforcing member 60 is an integral multiple (twice or more) of the third pitch P3 that is the arrangement pitch of the vertical wires of the breathable member 50
- the second pitch P2 that is the arrangement pitch of the transverse wires of the reinforcing member 60 is an integral multiple (twice or more) of the fourth pitch P4 that is the arrangement pitch of the transverse wires of the air-permeable member 50.
- the examples of FIGS. 5A to 5C are cases where the above-described magnification is five times.
- intersection CP50 of the air permeable member 50 is reliably matched with all the intersection CP60 of the reinforcement member 60 which exists in the said opening part 27a of the shaping
- FIG. Can be arranged.
- all the intersection points CP60 of the reinforcing member 60 can be brought into contact with the intersection point CP50 of the breathable member 50, and the intersection of the intersection points CP60 and CP50 can be joined to each other. It is more reliably and effectively suppressed over a wide range.
- the third wire 53 and the fourth wire 54 related to the breathable member 50 are joined at an intersection CP50 between the wires 53 and 54.
- the rigidity improvement of breathable member 50 itself can be aimed at, the deformation
- the pulp fiber 2 is effectively prevented from being clogged by the mesh 51 with the opening / closing deformation of the mesh 51.
- the reinforcing member 60 that is, it is desirable to join the first wire 61 and the second wire 62 of the reinforcing member 60 at the intersection CP60 between the wires 61 and 62.
- Examples of the bonding method include diffusion bonding.
- Diffusion bonding is a “method of bonding by using the diffusion of atoms generated between the bonding surfaces by bringing the base material into close contact and applying pressure to the extent that plastic deformation does not occur as much as possible under temperature conditions below the melting point of the base material”. (See Japanese Industrial Standards JIS Z3001-2 22702).
- both the breathable member 50 and the reinforcing member 60 are made of SUS304, the breathable member 50 and the reinforcing member 60 are superposed on each other, and the melting point of the SUS304 is not more than 800 to 1200 ° C., for example.
- both the air-permeable member 50 and the reinforcing member 60 are sandwiched and pressurized with a predetermined pressing member. Thereby, the intersection CP60 of the reinforcing member 60 and the breathable member 50 are joined, the first wire 61 and the second wire 62 of the reinforcing member 60 are joined, and further, the first of the breathable member 50 is joined.
- the 3 wire 53 and the 4th wire 54 are joined.
- bonding can be performed without using a brazing material such as solder or a welding rod, so that the brazing material lump is prevented from remaining on the mesh and the air permeability of the air permeable member 50 and the reinforcing member 60 is increased. It can be maintained in a good state.
- a brazing material such as solder or a welding rod
- the above diffusion bonding is performed with argon gas or nitrogen gas in order to improve the workability (plastic deformability) at that time. It is preferable to carry out in inert gas atmosphere.
- the mold plate 27 to which the air-permeable member 50 and the reinforcing member 60 are attached has an arc shape as shown in FIG. 2, the air-permeable member 50 and the reinforcing member 60 are also formed with the mold plate 27. It is necessary to perform a bending process in accordance with the curvature of the inner peripheral surface.
- concave portions or convex portions are formed in the air-permeable member 50 and the reinforcing member 60 so as to correspond to the three-dimensional shape.
- Such a bending process and the formation of a concave part or a convex part are performed by performing press working in the integrated state after the breathable member 50 and the reinforcing member 60 are integrated by diffusion bonding.
- the target three-dimensional shape of the air permeable member 50 and the reinforcing member 60 has the recessed part 56a and the convex part 56b which protruded and protruded in the said thickness direction. Therefore, as the press mold, a male press mold and a female press mold having a curved shape as a whole and having irregularities corresponding to the concave portions 56a and the convex portions 56b are used.
- the breathable member 50 and the reinforcing member 60 are sandwiched and pressed between the female press molds, thereby plastically deforming the breathable member 50 and the reinforcing member 60 to form the curved shape, the concave portion 56a and the convex portion 56b. .
- the above-described diffusion bonding may be performed in an inert gas atmosphere.
- FIG. 7A and 7B are explanatory views of a modification of the first embodiment, and are longitudinal sectional views corresponding to a BB section and a CC section in FIG. 5A, respectively.
- the single-layer reinforcement in which only one reinforcing member 60 is overlapped on the air-permeable member 50 is illustrated, but in this modification, two reinforcing members 60 are overlapped as an example.
- the difference is that the layer structure is reinforced, and the other points are almost the same. Therefore, the same components are denoted by the same reference numerals and description thereof is omitted.
- a reinforcing member 60a (hereinafter referred to as a second reinforcing member 60) (hereinafter referred to as a second reinforcing member 60) is further added to a reinforcing member 60 (hereinafter referred to as a first reinforcing member 60) bonded to the air-permeable member 50.
- a reinforcing member 60a hereinafter referred to as a second reinforcing member 60
- a first reinforcing member 60 hereinafter referred to as a first reinforcing member 60
- the second reinforcing member 60a is also a plain weave wire mesh, for example.
- the second reinforcing member 60 a includes a fifth wire 65 and a sixth wire 66 that intersect each other, and the diameter of these wires is larger than that of the first and second wires 61 and 62 of the first reinforcing member 60. It is getting thicker.
- the fifth wire 65 is arranged as a vertical wire along the circumferential direction Dc of the rotary drum 20, and the sixth wire 66 is arranged as a horizontal wire along the width direction of the rotary drum 20. Are perpendicular to each other at an intersection CP60a.
- the fifth wire 65 is arranged at the fifth pitch P5 in the longitudinal direction of the sixth wire 66, and the sixth wire is arranged at the sixth pitch P6 in the longitudinal direction of the fifth wire, and these fifth pitch P5.
- the 6th pitch P6 is mutually set to the same dimension, and, thereby, the mesh shape is a square.
- the fifth pitch P5, which is the arrangement pitch of the vertical wires of the second reinforcing member 60a, is an integral multiple of the first pitch P1, which is the arrangement pitch of the vertical wires of the first reinforcing member 60 (two or more, in this case, 2
- the sixth pitch P6, which is the arrangement pitch of the horizontal wires of the second reinforcing member 60a, is an integral multiple (2) of the second pitch P2, which is the arrangement pitch of the horizontal wires of the first reinforcing member 60. It is set to a size that is twice or more, and twice here.
- the intersection point CP60 of the first reinforcing member 60 can be reliably associated with all the intersection points CP60a of the second reinforcing member 60a. That is, all the intersection points CP60a of the second reinforcing member 60a can be brought into contact with the intersection point CP60 of the first reinforcing member 60, and as a result, the reinforcing effect can be further improved.
- a reinforcing member satisfying the above-described pitch relationship may be additionally provided and joined to the second reinforcing member 60a so as to form a three-layer reinforcing member.
- the reinforcing members satisfying the above may be sequentially stacked so that the reinforcing member has a multilayer structure of four or more layers.
- FIG. 8A to 8C show a second embodiment of the breathable member 50a and the reinforcing member 60.
- FIG. 8A is a plan view showing a part of the air-permeable member 50a with a part removed
- FIGS. 8B and 8C are a BB sectional view and a CC sectional view in FIG. 8A, respectively.
- the air holes 51a of the air permeable member 50a are omitted in order to prevent complication of the drawings.
- a metal mesh is used as the air-permeable member 50.
- the second embodiment is different in that a plate member is used, and the other points are substantially the same. Therefore, the same components are denoted by the same reference numerals and description thereof is omitted.
- the air-permeable member 50a is a metal plate such as a stainless steel plate (SUS304 in this example) having a predetermined thickness (here, 0.3 mm thick).
- a non-metal plate such as a resin plate may be used as long as it has a certain degree of rigidity and strength.
- the material of the breathable member 50a and the material of the reinforcing member 60 are preferably the same material.
- through holes 51a along the thickness direction are formed in a predetermined arrangement pattern as the air holes 51a over substantially the entire surface of the air permeable member 50a.
- the ventilation hole 51a is formed in a perfect circle shape with a diameter of 0.3 mm, for example, and the aperture ratio is 32.43%, for example.
- the arrangement pattern is, for example, a staggered pattern. That is, it has a vent hole row 151 in which a plurality of vent holes 51a are arranged at a predetermined pitch Ph (0.5 mm in this case) along the width direction of the rotary drum 20, and each of the vent hole rows 151 is a rotary drum.
- a half pitch Ph / 2
- Pm 2 ⁇ Ph ⁇ cos 30 °
- adjacent vent holes 51a 2 ⁇ Ph ⁇ cos 30 °
- the distances between the 51a are made equal for all the vent holes 51a.
- the arrangement pattern in this case can be said to be a pattern in which each apex of the regular triangle is a unit of a pattern where the air holes 51a are formed, and this is repeated over substantially the entire surface.
- the length of one side of the equilateral triangle is, for example, 0.5 mm, which is the same value as the above-mentioned Ph.
- Such a vent 51a is formed through, for example, by etching. That is, first, on the plate surface of the air permeable member 50a, an area corresponding to the area where the air holes 51a are not formed is masked with an anticorrosive agent, and then only the area corresponding to the air holes 51a is corroded with an appropriate chemical to vent holes. 51a is formed through.
- a region corresponding to that portion as shown in FIG. 9A 57a may be masked with an anticorrosive.
- region is formed, and the fabric weight of the pulp fiber 2 of this low density area
- the reinforcing member 60 is the same wire mesh as that of the first embodiment.
- the wire diameter is 0.9 mm
- the first pitch P1 and A wire net having a pitch corresponding to 4 pitches / inch and a numerical aperture of 73.7% can be used.
- the breathable member 50a and the reinforcing member 60 are joined at the intersection CP60 between the first wire 61 and the second wire 62 of the reinforcing member 60, as in the first embodiment described above.
- Examples include diffusion bonding.
- it is performed by the press process of the same procedure as 1st Embodiment. That is, after the breathable member 50a and the reinforcing member 60 are integrated by diffusion bonding, pressing is performed in the integrated state.
- the reinforcing member 60 is exemplified by a wire mesh in which the first wire 61 and the second wire 62 are orthogonal to each other, but the intersection angle between the first wire 61 and the second wire 62 is illustrated. Is not limited to 90 °, that is, an angle other than 90 ° may be set to change the mesh shape to a parallelogram, rhombus, or the like.
- a metal mesh in which the third wire 53 and the fourth wire 54 are orthogonal to each other is exemplified as the breathable member 50.
- the intersecting angle between the third wire 53 and the fourth wire 54 is 90 °.
- the mesh shape may be set to a parallelogram, a rhombus, or the like by setting an angle other than 90 °.
- the second reinforcing member 60a is exemplified by a wire mesh in which the fifth wire 65 and the sixth wire 66 are orthogonal to each other.
- the intersection angle between the fifth wire 65 and the sixth wire 66 is illustrated. Is not limited to 90 °, that is, an angle other than 90 ° may be set to change the mesh shape to a parallelogram, rhombus, or the like.
- the first pitch P1 of the first wire 61 and the second pitch P2 of the second wire 62 are equal to each other, but may be different from each other.
- the third pitch P3 of the third wire 53 and the fourth pitch P4 of the fourth wire 54 are equal to each other, but may be different from each other.
- the wire diameters of the first wire 61 and the second wire 62 are the same.
- the present invention is not limited to this, and even if the diameters are different from each other. good.
- the wire diameters of the third wire 53 and the fourth wire 54 are the same, but the present invention is not limited to this, and the diameters may be different from each other.
- a plain weave wire mesh is used for the air-permeable member 50 and a plain weave wire mesh is used for the reinforcing member 60.
- the present invention is not limited to this.
- a twill wire mesh may be applied to both, and a plain weave wire mesh may be used for one of the breathable member 50 and the reinforcing member 60, and a twill wire mesh may be used for the remaining one.
- the longitudinal relationship between the first wire 61 and the third wire 53 and the longitudinal relationship between the second wire 61 and the fourth wire 54 are described.
- the knitting method of the reinforcing member 60 and the knitting method of the breathable member 50 are preferably aligned with each other.
- the twill weave is a weaving method in which the longitudinal wires 61 (53) and the transverse wires 62 (54) are regularly woven in a line by arranging two or more wires in succession as shown in FIGS. 10A to 10C. is there.
- the reinforcing member 60 only needs to have a configuration in which the first wire 61 and the second wire 62 are connected at the intersection point CP60, that is, the configuration woven like the above-described plain weave or twill weave. is not.
- the positional relationship between the first wire 61 and the second wire 62 in the thickness direction may not be switched. That is, all the first wires 61 are present on one side in the thickness direction, all the second wires 62 are present on the other side, and the wires 61 and 62 are joined at the intersection CP60.
- the member 60c may be used. However, knitting is preferable because the first wire 61 and the second wire 62 are firmly connected at the intersection CP60.
- the reinforcing member 60 is disposed on one side of the breathable member 50 (or 50a). However, the reinforcing member 60 is disposed on both sides of the breathable member 50 (or 50a), and the pair of reinforcing members is provided.
- the breathable member 50 (or 50a) may be reinforced by 60, 60. Specifically, the reinforcing member 60 is arranged on one side of the breathable member 50 (or 50a), and the breathable member 50 (or the crossing point CP60 between the first wire 61 and the second wire 62 of the reinforcing member 60).
- a plate member having a circular hole shape of the vent hole 51a, a staggered pattern, and an aperture ratio of 32 and 43% is exemplified.
- the shape of the vent hole 51a may be an ellipse or a polygon
- the arrangement pattern may be a lattice pattern (square pattern)
- the aperture ratio may be set to a percentage other than the above.
- the reinforcing member 60 is joined to the breathable member 50 at the intersection point CP60.
- 1 absorbent body 2 pulp fibers (liquid absorbent material), 3 mixed air (gas), 10 fiber stacker (absorber manufacturing apparatus), 20 rotary drum, 20a outer peripheral surface, 21 molding die, 22a cylindrical partition, 22b partition wall, 23 ring member, 23a edge, 24 circular wall, 25 connection plate, 27 mold plate (molding mold member), 27a opening, 31 supply duct, 31a supply opening, 41 suction conveyor, 50 breathable member , 50a breathable member, 51 mesh (ventilation hole), 51a vent hole, 53 third wire, 54 fourth wire, 56a concave portion, 56b convex portion, 57a low density region, 57b concave portion, 60 reinforcing member, 60a reinforcing member, 60c reinforcing member, 61 first wire, 62 second wire, 65 fifth wire, 66 sixth wire, 51 vents column, Z1 first zone, Z2 second zone, C20 shaft, CP50 intersection, CP 60 intersection, CP60a intersection, S substantially closed space
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Abstract
Description
他方、補強部材が、当該補強部材の中で比較的低剛性の部位において金網50に接合されている場合には、積層時及び離型時に金網50に作用する上述の外力によって、前記補強部材の前記低剛性の部位が容易に変形してしまい、補強部材自体が疲労破壊する等して、期待通りの補強効果を得られない虞がある。つまり、金網50の変形を有効に抑制できない可能性がある。
成形型部材の開口部を覆う通気性部材の厚み方向に、液体吸収性素材を含む気体を通すことにより、前記通気性部材に前記液体吸収性素材を積層して、吸収性物品に係る吸収体を製造する装置であって、
前記厚み方向に前記通気性部材に重ね合わせられて前記通気性部材を補強する補強部材を有し、
前記補強部材は、互いに交差する第1ワイヤと第2ワイヤとを、これらの交点にて連結させてなる網目体であり、
前記交点において、前記補強部材は、前記通気性部材に接合されていることを特徴とする吸収体の製造装置である。
液体吸収性素材を積層して吸収性物品に係る吸収体を成形する際に使用される通気性部材であって、補強部材により補強されるとともに、前記吸収体の目標成形形状に対応した凹部及び凸部の少なくとも一方を有した通気性部材の製造方法であって、
前記通気性部材の素材は、厚み方向の前記液体吸収性素材の通過を規制する部材であり、
前記補強部材の素材は、互いに交差する第1ワイヤと第2ワイヤとを、これらの交点にて連結させてなる網目体であり、
前記通気性部材の素材と前記補強部材の素材とを前記厚み方向に重ね合わせつつ、前記第1ワイヤと前記第2ワイヤとの交点において、前記補強部材の素材を、前記通気性部材の素材に不活性ガス雰囲気下で拡散接合することにより、前記通気性部材の素材と前記補強部材の素材とを接合一体化することと、
前記補強部材の素材が接合一体化された前記通気性部材の素材を、雄プレス金型と雌プレス金型とで挟み込んでプレス加工することにより、前記凹部及び前記凸部の少なくとも一方を形成することと、を備えたことを特徴とする通気性部材の製造方法である。
前記厚み方向に前記通気性部材に重ね合わせられて前記通気性部材を補強する補強部材を有し、
前記補強部材は、互いに交差する第1ワイヤと第2ワイヤとを、これらの交点にて連結させてなる網目体であり、
前記交点において、前記補強部材は、前記通気性部材に接合されていることを特徴とする吸収体の製造装置。
前記第1ワイヤと前記第2ワイヤとは、編まれることによって前記交点にて連結されているのが望ましい。
このような吸収体の製造装置によれば、第1ワイヤと第2ワイヤとを強固に連結させることができる。
前記交点において、前記第1ワイヤと前記第2ワイヤとは接合されているのが望ましい。
このような吸収体の製造装置によれば、第1ワイヤと第2ワイヤとは接合されているので、補強部材自体の剛性アップを図れてその変形が抑制され、疲労破壊し難くなる。また、補強部材の網目の変形が抑制されることにもなるので、当該網目の開閉変形に伴って網目に液体吸収性素材が挟まれて詰まることも有効に防止される。
前記通気性部材は、互いに交差する第3ワイヤと第4ワイヤとが編まれてなる網目体であり、
前記通気性部材の網目は、前記補強部材の網目よりも細かく、
前記第3ワイヤと前記第4ワイヤとの交点は、前記開口部内に存在する前記補強部材の全ての交点に対応付けて配置されているとともに、前記補強部材の交点と、対応する前記第3ワイヤと前記第4ワイヤとの交点とが突き合わされているのが望ましい。
このような吸収体の製造装置によれば、前記成形型部材の開口部内に存在する前記補強部材の全ての交点に対応させて、第3ワイヤと第4ワイヤとの交点は配置されており、しかも、これら対応する交点同士は突き合わされている。よって、交点同士を突き合わせた高剛性の接合点によって、通気性部材の変形は、より確実に且つ広範囲に亘り有効に抑制されるようになる。
前記通気性部材は、互いに交差する第3ワイヤと第4ワイヤとが編まれてなる網目体であり、
前記通気性部材と前記補強部材とは、前記厚み方向に互いに重ね合わせられて接合された状態でプレス成形されてなる凹部及び凸部の少なくとも一方を有し、
前記プレス成形前の状態においては、
前記第1ワイヤは、前記第2ワイヤの長手方向に第1ピッチで配置され、
前記第2ワイヤは、前記第1ワイヤの長手方向に第2ピッチで配置され、
前記第3ワイヤの長手方向と前記第1ワイヤの長手方向とは揃っており、
前記第4ワイヤの長手方向と前記第2ワイヤの長手方向とは揃っており、
前記第3ワイヤは、前記第4ワイヤの長手方向に第3ピッチで配置され、
前記第4ワイヤは、前記第3ワイヤの長手方向に第4ピッチで配置され、
前記第1ピッチは、前記第3ピッチの整数倍(2倍以上)の大きさであり、
前記第2ピッチは、前記第4ピッチの整数倍(2倍以上)の大きさであるのが望ましい。
このような吸収体の製造装置によれば、前記開口部内に存在する前記補強部材の全ての交点に対して、通気性部材の交点を確実に対応させて配置することができ、これにより、通気性部材の変形は、広い範囲に亘って有効に抑制される。
また、通気性部材は、プレス成形されてなる凹部及び凸部を有するので、吸収体の目付量(g/cm2)を局所的に異ならせた三次元形状に吸収体を成型可能となる。
前記第3ワイヤと前記第4ワイヤとの交点において、前記第3ワイヤと前記第4ワイヤとは接合されているのが望ましい。
このような吸収体の製造装置によれば、第3ワイヤと第4ワイヤとは接合されているので、通気性部材自体の剛性アップを図れてその変形が抑制され、疲労破壊し難くなる。また、網目の変形が抑制されることにもなるので、当該網目の開閉変形に伴って網目に液体吸収性素材が挟まれて詰まることも有効に防止される。
前記通気性部材は、プレート部材を本体とし、
前記プレート部材には、前記厚み方向に沿った通気孔が貫通形成されているのが望ましい。
このような吸収体の製造装置によれば、プレート部材であるので、通気性部材が編み物である場合と比較して、通気孔の周囲部分が平面的になっており、これにより、通気孔への液体吸収性素材の詰まりが軽減される。特に、液体吸収性素材が高吸収性ポリマー等の粒状物である場合に、通気孔の目詰まりを有効に防止できる。
また、通気性部材が編み物である場合と比較して、通気孔の形状や通気孔の配置位置の設計自由度に優れる。
前記プレート部材は、前記開口部内において、前記通気孔の分布密度が周囲の領域よりも低い低密度領域を有するのが望ましい。
このような吸収体の製造装置によれば、通気孔の分布密度が低い低密度領域を有しており、当該低密度領域では、その周囲の領域と比較して補強部材との接合点の数を多く確保できる。よって、前記開口部内の全域に亘り通気孔の分布密度が一様な場合と比較して、補強部材との接合強度をより高めることができる。
また、前記低密度領域に係る液体吸収性素材の目付量は、他の領域と比較して相対的に少なくなるので、当該低密度領域を設定することにより、吸収体を目標の三次元形状に容易に作り込み可能となる。
前記接合は、不活性ガス雰囲気下において、拡散接合によりなされているのが望ましい。
このような吸収体の製造装置によれば、半田や溶接棒等のろう材を用いずに、接合を行うことができる。よって、ろう材塊が網目等に介在することが無く、結果、通気性部材や補強部材の通気性を良好な状態に維持できる。
また、拡散接合は、不活性ガス雰囲気下で行われる。よって、接合一体化された通気性部材及び補強部材に対してプレス成形により前記凹部又は凸部を形成する際には、接合一体化された状態を維持しながら、通気性部材及び補強部材は速やかに塑性変形可能となる。よって、プレス加工時に、補強部材の交点において通気性部材との接合が外れる等の不具合を回避できる。
周方向の一方向に連続回転する筒型の回転ドラムを有し、
前記成形型部材は、前記回転ドラムの外周面を構成するとともに、前記通気性部材によって、前記回転ドラムの内部空間と外部空間とは通気可能に連通され、
前記周方向の第1位置には、前記回転ドラムの外周面へ向けて外方から前記気体を供給する供給ダクトが設けられているとともに、前記第1位置に対応する前記回転ドラムの内部空間の範囲の気圧は、前記外部空間よりも気圧の低い負圧状態に維持され、
前記成形型部材が前記第1位置を通過する際には、前記通気性部材を介して前記供給ダクト内の前記気体が前記回転ドラムの前記内部空間へ吸い込まれて、前記通気性部材に前記吸収体が積層され、
前記周方向において前記第1位置よりも下流側の位置には、前記通気性部材から前記吸収体を離型する離型位置が設定されており、前記離型位置に対応する前記回転ドラムの内部空間の範囲の気圧は、前記外部空間の気圧以上に維持されているのが望ましい。
このような吸収体の製造装置によれば、上述の作用効果を有効に享受することができる。すなわち、成形型部材が第1位置を通過する際には、通気性部材は、気体から、回転ドラムの回転半径方向の内方に引かれる力を受ける一方、離型位置を通過する際には、逆に、気体から、回転ドラムの回転半径方向の外方に引かれる力を受ける。よって、通気性部材は、方向の逆転する外力を繰り返し受けて、疲労破壊に至る虞がある。この点につき、通気性部材には、補強部材が接合一体化されているとともに、しかも、補強部材の中で特に剛性の高い部位たる交点に接合されている。よって、上述の外力を受けた際の通気性部材の変形は有効に抑えられ、その結果、疲労破壊を起こし難くなる。
液体吸収性素材を積層して吸収性物品に係る吸収体を成形する際に使用される通気性部材であって、補強部材により補強されるとともに、前記吸収体の目標成形形状に対応した凹部及び凸部の少なくとも一方を有した通気性部材の製造方法であって、
前記通気性部材の素材は、厚み方向の前記液体吸収性素材の通過を規制する部材であり、
前記補強部材の素材は、互いに交差する第1ワイヤと第2ワイヤとを、これらの交点にて連結させてなる網目体であり、
前記通気性部材の素材と前記補強部材の素材とを前記厚み方向に重ね合わせつつ、前記第1ワイヤと前記第2ワイヤとの交点において、前記補強部材の素材を、前記通気性部材の素材に不活性ガス雰囲気下で拡散接合することにより、前記通気性部材の素材と前記補強部材の素材とを接合一体化することと、
前記補強部材の素材が接合一体化された前記通気性部材の素材を、雄プレス金型と雌プレス金型とで挟み込んでプレス加工することにより、前記凹部及び前記凸部の少なくとも一方を形成することと、を備えたことを特徴とする通気性部材の製造方法。
前記補強部材は、前記第1ワイヤと前記第2ワイヤとを編んでなる網目体であり、
前記通気性部材は、互いに交差する第3ワイヤと第4ワイヤとを編んでなる網目体であり、
前記接合一体化することでは、前記第1ワイヤと前記第2ワイヤとの交点において、前記第1ワイヤと前記第2ワイヤとが拡散接合され、
前記第3ワイヤと前記第4ワイヤとの交点において、前記第3ワイヤと前記第4ワイヤとが拡散接合されるのが望ましい。
このような通気性部材の製造方法によれば、補強部材は、第1ワイヤと第2ワイヤとが編まれてなる編み物である。そして、接合一体化工程では、この編み物をなす第1ワイヤと第2ワイヤとが接合されるので、補強部材自体の剛性アップを図れてその変形が抑制され、疲労破壊し難くなる。また、補強部材の網目の変形が抑制されることにもなるので、当該網目の開閉変形に伴って網目に液体吸収性素材が挟まれて詰まることも有効に防止される。
更には、拡散接合の適用により、ろう材を用いずに接合できる。よって、ろう材塊が網目等に介在すること無く、通気性部材や補強部材の通気性を良好な状態に維持することができる。
<<<吸収体1の製造装置10の概略構成について>>>
図1は、吸収体1の製造装置10の一例の中心縦断面図である。
吸収体1の製造装置10は、液体吸収性素材としてのパルプ繊維2を積層して吸収体1を成形する、いわゆる積繊装置である。そして、その主な構成として、例えば、(1)水平な軸C20を回転中心として周方向Dcの一方向に(例えば時計回りに)連続回転する回転ドラム20と、(2)回転ドラム20の周方向Dcの所定位置(第1位置に相当)に配置された供給開口部31aから回転ドラム20の外周面20aに向けてパルプ繊維2を含んだ混入空気3(気体に相当)を吐出供給する供給ダクト31と、(3)供給ダクト31よりも周方向Dcの下流側に配置され、回転ドラム20の外周面20aの成形型21から吸収体1を離型すべく吸引して搬送するサクションコンベア41と、を備えている。
図2は、回転ドラム20の分解斜視図である。
回転ドラム20は、幅方向の左右に並んで配置された一対のリング部材23,23と、リング部材23,23同士の間に間隔を保った状態でこれらリング部材23,23同士を連結する複数の連結プレート25と、周方向Dcに適宜ピッチで隣り合う前記連結プレート25,25同士の間に架け渡されて回転ドラム20の外周面20aをなす複数の成形型プレート27(成形型部材に相当)と、を有している。
以下、通気性部材50及び補強部材60について、その具体例を示しながら詳細に説明する。
図5A乃至図5Cに、通気性部材50及び補強部材60の第1実施形態を示す。図5Aは、通気性部材50の一部を取り除いて示す平面図であり、図5B及び図5Cは、それぞれ、図5A中のB-B断面図及びC-C断面図である。
図8A乃至図8Cに、通気性部材50a及び補強部材60の第2実施形態を示す。図8Aは、通気性部材50aの一部を取り除いて示す平面図であり、図8B及び図8Cは、それぞれ、図8A中のB-B断面図及びC-C断面図である。なお、図8B及び図8Cでは、図の錯綜を防ぐべく、通気性部材50aの通気孔51aを省略して示している。
以上、本発明の実施形態について説明したが、本発明は、かかる実施形態に限定されるものではなく、以下に示すような変形が可能である。
Claims (12)
- 成形型部材の開口部を覆う通気性部材の厚み方向に、液体吸収性素材を含む気体を通すことにより、前記通気性部材に前記液体吸収性素材を積層して、吸収性物品に係る吸収体を製造する装置であって、
前記厚み方向に前記通気性部材に重ね合わせられて前記通気性部材を補強する補強部材を有し、
前記補強部材は、互いに交差する第1ワイヤと第2ワイヤとを、これらの交点にて連結させてなる網目体であり、
前記交点において、前記補強部材は、前記通気性部材に接合されていることを特徴とする吸収体の製造装置。 - 請求項1に記載の吸収体の製造装置であって、
前記第1ワイヤと前記第2ワイヤとは、編まれることによって前記交点にて連結されていることを特徴とする吸収体の製造装置。 - 請求項2に記載の吸収体の製造装置であって、
前記交点において、前記第1ワイヤと前記第2ワイヤとは接合されていることを特徴とする吸収体の製造装置。 - 請求項1乃至3の何れかに記載の吸収体の製造装置であって、
前記通気性部材は、互いに交差する第3ワイヤと第4ワイヤとが編まれてなる網目体であり、
前記通気性部材の網目は、前記補強部材の網目よりも細かく、
前記第3ワイヤと前記第4ワイヤとの交点は、前記開口部内に存在する前記補強部材の全ての交点に対応付けて配置されているとともに、前記補強部材の交点と、対応する前記第3ワイヤと前記第4ワイヤとの交点とが突き合わされていることを特徴とする吸収体の製造装置。 - 請求項1乃至4の何れかに記載の吸収体の製造装置であって、
前記通気性部材は、互いに交差する第3ワイヤと第4ワイヤとが編まれてなる網目体であり、
前記通気性部材と前記補強部材とは、前記厚み方向に互いに重ね合わせられて接合された状態でプレス成形されてなる凹部及び凸部の少なくとも一方を有し、
前記プレス成形前の状態においては、
前記第1ワイヤは、前記第2ワイヤの長手方向に第1ピッチで配置され、
前記第2ワイヤは、前記第1ワイヤの長手方向に第2ピッチで配置され、
前記第3ワイヤの長手方向と前記第1ワイヤの長手方向とは揃っており、
前記第4ワイヤの長手方向と前記第2ワイヤの長手方向とは揃っており、
前記第3ワイヤは、前記第4ワイヤの長手方向に第3ピッチで配置され、
前記第4ワイヤは、前記第3ワイヤの長手方向に第4ピッチで配置され、
前記第1ピッチは、前記第3ピッチの整数倍(2倍以上)の大きさであり、
前記第2ピッチは、前記第4ピッチの整数倍(2倍以上)の大きさであることを特徴とする吸収体の製造装置。 - 請求項4又は5に記載の吸収体の製造装置であって、
前記第3ワイヤと前記第4ワイヤとの交点において、前記第3ワイヤと前記第4ワイヤとは接合されていることを特徴とする吸収体の製造装置。 - 請求項1乃至3の何れかに記載の吸収体の製造装置であって、
前記通気性部材は、プレート部材を本体とし、
前記プレート部材には、前記厚み方向に沿った通気孔が貫通形成されていることを特徴とする吸収体の製造装置。 - 請求項7に記載の吸収体の製造装置であって、
前記プレート部材は、前記開口部内において、前記通気孔の分布密度が周囲の領域よりも低い低密度領域を有することを特徴とする吸収体の製造装置。 - 請求項1乃至8の何れかに記載の吸収体の製造装置であって、
前記接合は、不活性ガス雰囲気下において、拡散接合によりなされていることを特徴とする吸収体の製造装置。 - 請求項1乃至9の何れかに記載の吸収体の製造装置であって、
周方向の一方向に連続回転する筒型の回転ドラムを有し、
前記成形型部材は、前記回転ドラムの外周面を構成するとともに、前記通気性部材によって、前記回転ドラムの内部空間と外部空間とは通気可能に連通され、
前記周方向の第1位置には、前記回転ドラムの外周面へ向けて外方から前記気体を供給する供給ダクトが設けられているとともに、前記第1位置に対応する前記回転ドラムの内部空間の範囲の気圧は、前記外部空間よりも気圧の低い負圧状態に維持され、
前記成形型部材が前記第1位置を通過する際には、前記通気性部材を介して前記供給ダクト内の前記気体が前記回転ドラムの前記内部空間へ吸い込まれて、前記通気性部材に前記吸収体が積層され、
前記周方向において前記第1位置よりも下流側の位置には、前記通気性部材から前記吸収体を離型する離型位置が設定されており、前記離型位置に対応する前記回転ドラムの内部空間の範囲の気圧は、前記外部空間の気圧以上に維持されていることを特徴とする吸収体の製造装置。 - 液体吸収性素材を積層して吸収性物品に係る吸収体を成形する際に使用される通気性部材であって、補強部材により補強されるとともに、前記吸収体の目標成形形状に対応した凹部及び凸部の少なくとも一方を有した通気性部材の製造方法であって、
前記通気性部材の素材は、厚み方向の前記液体吸収性素材の通過を規制する部材であり、
前記補強部材の素材は、互いに交差する第1ワイヤと第2ワイヤとを、これらの交点にて連結させてなる網目体であり、
前記通気性部材の素材と前記補強部材の素材とを前記厚み方向に重ね合わせつつ、前記第1ワイヤと前記第2ワイヤとの交点において、前記補強部材の素材を、前記通気性部材の素材に不活性ガス雰囲気下で拡散接合することにより、前記通気性部材の素材と前記補強部材の素材とを接合一体化することと、
前記補強部材の素材が接合一体化された前記通気性部材の素材を、雄プレス金型と雌プレス金型とで挟み込んでプレス加工することにより、前記凹部及び前記凸部の少なくとも一方を形成することと、を備えたことを特徴とする通気性部材の製造方法。 - 請求項11に記載の通気性部材の製造方法であって、
前記補強部材は、前記第1ワイヤと前記第2ワイヤとを編んでなる網目体であり、
前記通気性部材は、互いに交差する第3ワイヤと第4ワイヤとを編んでなる網目体であり、
前記接合一体化することでは、前記第1ワイヤと前記第2ワイヤとの交点において、前記第1ワイヤと前記第2ワイヤとが拡散接合され、
前記第3ワイヤと前記第4ワイヤとの交点において、前記第3ワイヤと前記第4ワイヤとが拡散接合されることを特徴とする通気性部材の製造方法。
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| AU2010211839A AU2010211839A1 (en) | 2009-02-05 | 2010-01-27 | A manufacturing apparatus for an absorbent body, and a method for manufacturing an air-permeable member |
| CA2750702A CA2750702A1 (en) | 2009-02-05 | 2010-01-27 | A manufacturing apparatus for an absorbent body, and a method for manufacturing an air-permeable member |
| US13/146,530 US20120018078A1 (en) | 2009-02-05 | 2010-01-27 | Manufacturing apparatus for an absorbent body, and a method for manufacturing an air-permeable member |
| NZ594750A NZ594750A (en) | 2009-02-05 | 2010-01-27 | An apparatus and method for manufacturing an absorbent body for an absorbent article, such as a diaper or sanitary napkin |
| CN201080012239.0A CN102355877B (zh) | 2009-02-05 | 2010-01-27 | 吸收体的制造设备以及透气部件的制造方法 |
| BRPI1005334A BRPI1005334B8 (pt) | 2009-02-05 | 2010-01-27 | aparelho de fabricação de corpo absorvente e método para a fabricação de membro permeável ao ar |
| EA201101168A EA019415B1 (ru) | 2009-02-05 | 2010-01-27 | Аппарат для получения поглощающего элемента абсорбирующего изделия |
| EP10738442.2A EP2394620B1 (en) | 2009-02-05 | 2010-01-27 | Apparatus for manufacturing an absorbing body and method of manufacturing an air permeable member |
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| WO2007037357A1 (ja) * | 2005-09-29 | 2007-04-05 | Daio Paper Corporation | 吸収体の積繊装置、積繊ドラム、及びこれを用いた吸収体の製造方法、並びにこの製造方法により製造された吸収体を有する吸収性物品 |
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| US4778644A (en) * | 1987-08-24 | 1988-10-18 | The Procter & Gamble Company | Method and apparatus for making substantially fluid-impervious microbubbled polymeric web using high pressure liquid stream |
| US4936934A (en) * | 1988-08-08 | 1990-06-26 | Accurate Products Co. | Process and apparatus for collecting nonwoven web |
| US5398816A (en) * | 1993-07-20 | 1995-03-21 | Sweco, Incorporated | Fine mesh screening |
| JP4587909B2 (ja) * | 2005-08-24 | 2010-11-24 | 花王株式会社 | 積繊装置の回転ドラム |
| JP4820333B2 (ja) * | 2007-06-22 | 2011-11-24 | 花王株式会社 | 吸収体の製造装置 |
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2009
- 2009-02-05 JP JP2009025228A patent/JP5210914B2/ja active Active
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2010
- 2010-01-27 NZ NZ594750A patent/NZ594750A/xx not_active IP Right Cessation
- 2010-01-27 EP EP10738442.2A patent/EP2394620B1/en not_active Not-in-force
- 2010-01-27 CA CA2750702A patent/CA2750702A1/en not_active Abandoned
- 2010-01-27 CN CN201080012239.0A patent/CN102355877B/zh active Active
- 2010-01-27 KR KR1020117020205A patent/KR101553433B1/ko active Active
- 2010-01-27 BR BRPI1005334A patent/BRPI1005334B8/pt not_active IP Right Cessation
- 2010-01-27 EA EA201101168A patent/EA019415B1/ru not_active IP Right Cessation
- 2010-01-27 US US13/146,530 patent/US20120018078A1/en not_active Abandoned
- 2010-01-27 AU AU2010211839A patent/AU2010211839A1/en not_active Abandoned
- 2010-01-27 WO PCT/JP2010/051021 patent/WO2010090107A1/ja not_active Ceased
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2011
- 2011-08-07 EG EG2011081321A patent/EG26177A/en active
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| JPH07119013A (ja) * | 1985-12-10 | 1995-05-09 | Kimberly Clark Corp | 軽または重毛羽区域の制御された地合い |
| JPH02107250A (ja) * | 1988-10-17 | 1990-04-19 | Takao Sakata | 液吸収体並びにその製造方法及び装置 |
| JP2006122109A (ja) * | 2004-10-26 | 2006-05-18 | Daio Paper Corp | 吸収性物品の製造装置、吸収性物品の製造方法およびこれを用いて製造した吸収性物品 |
| WO2007037357A1 (ja) * | 2005-09-29 | 2007-04-05 | Daio Paper Corporation | 吸収体の積繊装置、積繊ドラム、及びこれを用いた吸収体の製造方法、並びにこの製造方法により製造された吸収体を有する吸収性物品 |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9155664B2 (en) | 2009-03-02 | 2015-10-13 | Unicharm Corporation | Conveyor apparatus and method of manufacturing absorbent article |
| EP2612634A4 (en) * | 2010-08-31 | 2014-07-23 | Uni Charm Corp | DEVICE FOR PREPARING AN ABSORBENT AND METHOD FOR PRODUCING AN AIR-AIR ELEMENT |
| US9486946B2 (en) | 2010-08-31 | 2016-11-08 | Uni-Charm Corporation | Apparatus for manufacturing absorbent body and method for manufacturing air-permeable member |
| CN102078249A (zh) * | 2010-10-19 | 2011-06-01 | 杭州珂瑞特机械制造有限公司 | 隔片式框架模轮 |
| CN106915045A (zh) * | 2017-03-13 | 2017-07-04 | 山东大学 | 一种组合排列式的块状透气体镶嵌模具 |
| CN106915045B (zh) * | 2017-03-13 | 2023-04-07 | 山东大学 | 一种组合排列式的块状透气体镶嵌模具 |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2010178919A (ja) | 2010-08-19 |
| EA019415B1 (ru) | 2014-03-31 |
| EG26177A (en) | 2013-04-04 |
| BRPI1005334B1 (pt) | 2020-03-17 |
| EA201101168A1 (ru) | 2012-01-30 |
| CN102355877A (zh) | 2012-02-15 |
| CA2750702A1 (en) | 2010-08-12 |
| KR20110118702A (ko) | 2011-10-31 |
| CN102355877B (zh) | 2014-07-02 |
| BRPI1005334A2 (ja) | 2018-03-06 |
| US20120018078A1 (en) | 2012-01-26 |
| EP2394620B1 (en) | 2018-09-12 |
| NZ594750A (en) | 2013-01-25 |
| BRPI1005334B8 (pt) | 2021-06-22 |
| EP2394620A1 (en) | 2011-12-14 |
| EP2394620A4 (en) | 2014-08-06 |
| AU2010211839A1 (en) | 2011-09-08 |
| KR101553433B1 (ko) | 2015-09-15 |
| JP5210914B2 (ja) | 2013-06-12 |
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