WO2018154803A1 - Method and device for producing composite stretchable member having tunnel spaces, and composite stretchable member having tunnel spaces - Google Patents

Abstract

The present invention addresses the problems of reducing the used amount of a hot-melt adhesive for joining, achieving a decrease in product costs by dispensing with an elastic member (thread-like rubber), and enhancing function as tunnel spaces (pleats (folds)) when joining two sheets (a non-stretchable sheet of a first substrate and a stretchable sheet of a second substrate). A method for producing a composite stretchable member comprises: a transfer step (I) for applying a thin film hot-melt adhesive (HM) to the rear surface of the non-stretchable sheet of the first substrate (A) using a pattern distribution from the surfaces of protrusions (12) of a pattern roll (1); and a bonding step (II) for cladding the first substrate and the stretchable sheet of the second substrate (B), said first substrate having had the thin film hot-melt adhesive applied to the rear surface thereof by the above-mentioned process, and said second substrate being fed at a running speed that is 1/2 or less than that of the first substrate, wherein the distribution of adhesion positions and the cross-sectional shape of the tunnel spaces are set by the pattern distribution from the surfaces of the protrusions of the pattern roll by configuring a stretchable nonwoven fabric sheet to the natural length thereof.

Description

Method of manufacturing composite stretchable member having tunnel space, manufacturing apparatus, and composite stretchable member having tunnel space

The present invention is a composite stretchable member comprising a non-stretchable sheet of a first base and a stretchable sheet of a second base, for forming a tunnel space formed between the two sheets. The present invention relates to a method of manufacturing a compound stretchable member, a manufacturing apparatus, and a compound stretchable member.
In addition, a nonwoven fabric, paper, etc. are applied as a 1st base material and a 2nd base material.

In an absorbent article such as a disposable diaper or a sanitary napkin, an elastic member is joined to a sheet material in a stretched state, and the elastic member is It is widely practiced to shrink to form gathers (stretchable parts having a large number of folds) on the sheet material.
As a composite stretchable member of this type, an elastic member whose longitudinal direction is the stretch direction is interposed between a plurality of sheet layers, and a linear joint portion located in a direction perpendicular to the stretch direction of the elastic member. A disposable diaper provided with an elastic stretchable portion is known.

Published Utility Model Publication: Japanese Utility Model Application Publication No. 4-71922 Patent Publication No. 5928469

Problems to be solved by the invention

Patent Document 1 (title of the invention: a gatherer for disposable articles) is a composite stretchable member having two sheet members and a plurality of elastic members disposed between the two sheet members, The sheet material is partially bonded to form a plurality of bonding portions, and a plurality of bonding lines extending in a direction intersecting the expansion and contraction direction of the elastic member are formed by the plurality of bonding portions, Each elastic member R is fixed between the two sheet materials at at least a part of the joint portion, and each of the two sheet materials forms a gather (a weir) T 'between the adjacent joint lines. A composite telescopic member is disclosed (see FIG. 10).
Furthermore, due to the presence of a plurality of elastic members (thread rubber) arranged between both sheet materials, two sheets of the elastic material (thread rubber) are interposed at the position of the joining line. The sheet material of is fixed.
Therefore, there is a problem that a plurality of elastic members (thread rubber) are required.

Patent document 2 (roll transfer application method and application apparatus for hot melt adhesive) is a prior invention by the inventor of the present invention, the patentee is the applicant of the present application, and referring to FIG. In the roll transfer application method of a hot melt adhesive including the step of transferring the hot melt adhesive applied to the portion from the convex surface 12 of the pattern roll to the surface of the coated substrate, the slot groove is the axial center of the pattern roll By providing a coater head in the direction opposite to the pattern surface of the pattern roll, and supplying the hot melt adhesive HM supplied from the hot melt adhesive supply device to the pattern surface of the pattern roll 10 in a thin film state, A hot melt adhesive, characterized in that a thin film hot melt adhesive is supplied only to the convex surface 12 of the pattern roll. It discloses Le transfer coating method.

The present invention applies the above-described invention to the bonding of two sheets (the non-stretchable sheet of the first base and the stretchable sheet of the second base), and a thin film hot melt is applied to a predetermined location of the base sheet. By performing pattern application of the adhesive, reduction of the usage amount of the hot melt adhesive for bonding and reduction of product cost without using a plurality of elastic members (thread rubber) in Patent Document 1 Let's make it a task.
Another object is to enhance the function as a tunnel space (bleets).

Solution to the problem

According to the invention of claim 1, the thin film hot melt adhesive is applied to the back surface of the non-stretchable sheet of the first base material in a pattern distribution by the convex surface of the pattern roll. A transfer process,
Bonding the first base material coated with the thin film hot melt adhesive on the back side to the stretchable sheet of the second base material fed at a traveling speed of 1/2 or less to the first base , Including the bonding process,
A method of manufacturing a composite stretchable member characterized in that the distribution of bonding positions and the cross-sectional shape of the tunnel space are set by making the stretchable non-woven fabric sheet natural length so that the distribution of bonding positions and the cross-sectional shape of tunnel space provide.
In the invention of claim 2 of the present application, the thin film hot melt adhesive is applied to the back surface of the non-stretchable sheet of the first base material in a pattern distribution due to the convex surface of the pattern roll. A transfer step, a first base material coated with a thin film hot melt adhesive on the back side in the above step, and an elastic sheet of the second base material fed at a traveling speed of 1/2 or less with respect to the first base material; Including the pasting process of pasting place,
In the transfer step, the pattern distribution by the convex portion surface of the pattern roll is a narrow straight line in the direction orthogonal to the traveling direction of the first base material, and the bonding / fixing part between the first base material and the second base material is the coated base material Intermittently present in a narrow straight line in the direction orthogonal to the longitudinal direction,
Provided is a method of manufacturing a composite stretchable member having a tunnel space, wherein the tunnel space formed by making the stretchable non-woven sheet natural length is intermittently present in the direction orthogonal to the traveling direction of the coated substrate. Do.
In the invention of claim 3 of the present application, the thin film hot melt adhesive is applied to the back surface of the non-stretchable sheet of the first base material in a pattern distribution due to the convex surface of the pattern roll. A transfer process,
Bonding the first base material coated with the thin film hot melt adhesive on the back side to the stretchable sheet of the second base material fed at a traveling speed of 1/2 or less to the first base , Including the bonding process,
In the transfer step, the pattern distribution by the convex portion surface of the pattern roll is a narrow straight line in the direction orthogonal to the traveling direction of the first base material, and the bonding portion between the first base material and the second base material is the coated base material longitudinal Intermittently with narrow straight lines in the direction orthogonal to the direction, and divided into multiple sections with different narrow straight line intervals,
The tunnel space formed by making the stretchable nonwoven sheet natural length is intermittently present in the direction orthogonal to the traveling direction of the coated substrate, and is divided into a plurality of application sections in which the cross-sectional shape of the tunnel space is different. The present invention provides a method of manufacturing a composite stretchable member having a tunnel space.
The invention of claim 4 of the present application is a supply device of a non-stretchable sheet of a first substrate, a transfer device for transferring and applying a thin film hot melt adhesive to the first substrate, and a supply of an elastic sheet of a second substrate. An apparatus, and a bonding apparatus for bonding the first and second substrates,
The number of rotations of the drive roller of the second base material supply device is equal to or less than half the number of rotations of the drive roller of the first base material supply device, and the pattern distribution by the convex surface of the pattern roll of the transfer device is the roll A manufacturing apparatus of a stretchable member characterized in that it is a narrow straight line in a direction orthogonal to the rotation direction.
The invention of claim 5 of the present application provides a supply device of a non-stretchable sheet of a first substrate, a transfer device for transferring and applying a thin film hot melt adhesive to the first substrate, and a supply of an elastic sheet of a second substrate. An apparatus, and a bonding apparatus for bonding the first and second substrates,
The number of rotations of the drive roller of the second base material supply device is equal to or less than half the number of rotations of the drive roller of the first base material supply device, and the pattern distribution by the convex surface of the pattern roll of the transfer device is the roll Production of a composite stretchable member having a tunnel space, characterized in that it is a narrow straight line in a direction orthogonal to the rotation direction, and is divided into a plurality of sections in which the narrow straight lines have different intervals in the roll rotation direction. Provide an apparatus.
According to the invention of claim 6, the pattern distribution by the surface of the convex portion of the pattern roll of the transfer device is a narrow straight line in the direction orthogonal to the roll rotation direction, and the spacing between narrow straight lines (pitch of the narrow straight line) The apparatus for manufacturing a composite stretchable member having a tunnel space according to claim 5, wherein there are a plurality of different sections.
The invention of claim 7 of the present application is configured by laminating the non-stretchable sheet of the first base material and the stretchability of the second base material via the bonding and fixing portion with a thin film hot melt adhesive, and the first base material The present invention provides a composite stretchable member having a tunnel space, characterized in that a tunnel space is formed between the fixed area between the non-stretchable sheet of and the stretchable sheet of the second base material.
The invention according to claim 7 of the present application is configured by laminating a non-stretchable nonwoven sheet and a stretchable nonwoven sheet via a fixed area with a thin film hot melt adhesive, and the non-stretchable nonwoven sheet and the stretchable nonwoven sheet A tunnel space is formed between the fixed areas, and the fixed area is a narrow straight line in a direction orthogonal to the longitudinal direction of the composite stretchable member, and is intermittently present in the longitudinal direction of the composite stretchable member. A composite stretchable member having the
[Effect of the invention]

The present invention is an elastic member by fixing the non-stretchable sheet of the first base and the stretchable sheet of the second base by the thin film hot melt adhesive with the pattern distribution by the convex surface of the pattern roll. It has the effect of being able to provide a composite stretchable member in which a tunnel space [bleats (brows)] which is soft and has a good feel and a good touch can be provided without using (thread rubber) and reducing the manufacturing cost.
Furthermore, it has the effect of being able to provide a composite stretchable member having a tunnel space with good bondability between the composite stretchable member and the sheet-like member to be stacked.

The schematic diagram of the manufacturing apparatus of the compound expansion-contraction member which has a tunnel space which shows this invention 1st Example. The expanded view of the convex part surface of a pattern roll. It is explanatory drawing of a coating area, a figure is a top view, b figure is a side view, c figure is an expanded sectional view of a coating area. It is explanatory drawing of an adhesion fixation area, a figure is a top view, b figure is a side view, c figure is an expanded sectional view of a fixation area. Explanatory drawing explanatory drawing of a tunnel space, a figure is sectional drawing, b figure is a perspective view. The expanded view which shows another Example about pattern distribution of the convex part surface of a pattern roll. The top view schematic of the manufacturing apparatus of the compound expansion-contraction member which has a tunnel space which shows this invention 2nd Example. The expanded view which shows another Example about pattern distribution of the convex part surface of a pattern roll. Explanatory drawing of the distribution and shape of the tunnel space in the embodiment of pattern distribution shown in FIG. 8 a is a plan view, b is a longitudinal sectional view at the center of the plan, c is a longitudinal cross section at the side of the plan Figure. The perspective view of the compound elastic member of patent documents 1. It is explanatory drawing which shows supplying the hot-melt-adhesive of a thin film only to the convex part surface of a pattern roll in patent document 2, and a figure is sectional drawing and b figure is a top view.

I
In the transfer step, a thin film hot melt adhesive is applied to the back surface of the non-stretchable sheet (non-woven fabric) of the first base material in a pattern distribution by the convex surface of the pattern roll.
II
In the next bonding step, a non-stretchable sheet (non-woven fabric) of a first base material coated with a thin film hot melt adhesive on the back surface in the above step;
The elastic sheet (nonwoven fabric) of the second base material is passed between the speed reduction drive rolls, and the traveling speed between the pressure-rolling rolls is less than half the traveling speed of the non-elastic sheet (nonwoven fabric) of the first base material. And the non-stretchable sheet (non-woven fabric), which is the first base material, and the stretchable sheet (non-woven fabric) of the second base material are pasted together.
III
The elastic sheet (nonwoven fabric) of the second base material has a natural length by progressing through the bonding step and the elastic sheet of the second base material and the lower surface of the non-elastic sheet (nonwoven fabric) of the first base material Between the upper surface of the non-woven fabric and the upper surface of the non-woven fabric, a fixed area is formed by the hot melt adhesive of the pattern distribution of the convex surface of the pattern roll.
IV
Furthermore, a tunnel space is formed between the fixed areas.
V
The pattern distribution on the surface of the convex portion of the pattern roll in the transfer step I is shaped so as to be intermittent with a narrow straight line in the direction orthogonal to the longitudinal direction of the member.

An apparatus for producing a multilayer stretchable member having a tunnel space according to the present invention shown in FIGS. 1 to 5 will be described.
First, referring to FIG. 1, a supply device 1 for a non-stretchable sheet of a first base material, a transfer device 2 for transferring and applying a thin film hot melt adhesive to a first base material A, and expansion and contraction of a second base material Of the first sheet A and the second sheet B of the first substrate A.

The supply apparatus 1 of the non-stretchable sheet | seat of a 1st base material is comprised by a pair of upper and lower drive rolls 5 and 5. As shown in FIG. The transfer device 2 comprises a pattern roll 10 and a rolling roll 6.
The decelerating supply device 3 for the elastic sheet B of the second base material includes decelerating drive rolls 7 and 7 and a tension roll 8.
The bonding apparatus 4 for bonding the first base and the second base includes rolling rolls 9 and 9.
The pair of upper and lower drive rolls 5, 5 of the feeding apparatus 1 of the first base material non-stretchable sheet, and the rolling rolls 9, 9 of the bonding apparatus 4 are synchronously operated via the servo mechanism and substantially the same rotation Drive by number.
The pattern roll 10 and the rolling roll 6 of the transfer device 2 are free rolls and correspond to the transfer speed of the first base material A, so that they have the same speed as the rolling rolls 9 and 9 of the bonding device 4.

The driving rotational speed of the reduction driving rolls 7 of the reduction supply device 3 is set to 1/2 or less of the rotational speed of the rolling rolls 9 of the bonding device 4. That is, the transfer speed of the second base material B is set to 1/2 or less of the transfer speed of the first base material A.

A convex surface 12 and a concave surface 13 are formed on the surface of the pattern roll 10 of the transfer device 2.
The thin film hot melt adhesive HM supplied from the application head 11 of the hot melt adhesive supply device is applied to the convex surface 12 of the pattern surface.
The pattern distribution by the convex surface 12 of the pattern roll of the transfer device is a narrow straight line in the direction orthogonal to the roll rotation direction.

FIG. 2 is a developed view of a roll surface showing an example of a pattern distribution, where a shows the width d of the convex surface 12 0.3 mm, the pitch p 4 mm, and b shows the convex surface 12. The width d is 0.3 mm, the pitch p is 7 mm, and the width c of the convex portion surface 12 is 0.3 mm to 0.5 mm, and the pitch p is 10 mm.

Below, the example of a condition of each part of application | coating operation is shown.
Pitch p: 0.2 mm to 0.5 mm
Coating thickness: 5μ to 30μ
Transfer speed of substrate A: 400 m / min
Hot melt adhesive supply hot melt supply path temperature: 160 ° C
Patterned roll temperature: 130 ° C to 65 ° C
It should be noted that the above shows an example of the application conditions, and does not indicate the limiting conditions.

The formation of a tunnel space according to the invention will now be described.
FIG. 3 shows the coated state of the thin film hot melt adhesive HM between the transfer step E1 and the bonding step E2.
A thin film hot melt adhesive HM is applied to the lower surface of the first base material A in the range of the area Q in the application pattern of the developed view shown in FIG.
FIG. 4 shows the coated state of the thin film hot melt adhesive HM immediately after the bonding step E2.
By passing between the pressure-rolling rolls, the application range of the thin film hot melt adhesive HM is expanded around the application area Q, and becomes the range of the fixed area QQ. Accordingly, the bonding and fixing range of the first base material A and the second base material B, that is, the fixed area QQ is completed.

Referring to FIG. 5, when the elastic sheet (non-woven fabric) of the second base material changes to a natural length, a tunnel space T is formed between the fixed areas QQ.
The tunnel space T intermittently exists in a direction orthogonal to the traveling direction of the coated substrate.

FIG. 6 shows an embodiment in which the pattern distribution of the pattern roll 1 is divided into a plurality of divisions in which the narrow straight line intervals of the convex surface 12 are different in the direction perpendicular to the roll rotation direction (longitudinal direction in the pattern development view). An example is shown. In FIG. 7, 10A, 10B and 10C are coating heads, 13A, 13B and 13C are hot melt supply devices, and 14 is a hot melt tank.

FIG. 7 shows an embodiment in which a plurality of (6A, 6B, 6C) hot melt adhesive supply devices 10 and pattern rolls 6 are provided side by side, and the intervals of narrow straight lines are made different for each pattern roll 10.

FIG. 8 shows a large number of narrow straight lines 12B formed in the inclination direction in addition to the large number of narrow straight lines 12A formed in the direction orthogonal to the roll rotation direction (longitudinal direction in the pattern development view). , 12B ′ are shown.

FIG. 9 shows that the base material A on which the coated area Q composed of the thin film hot melt adhesive HM coated with the pattern distribution cloth of FIG. Based on the approach of the fixed area QQ, the distribution of the tunnel space T is shown. In FIG. 9, the tunnel space includes T1, T2, T3, and T3 '.
With respect to the fixed area QQ formed by the large number of narrow straight lines formed in the inclination direction, a change component in the direction orthogonal to the inclination direction acts on the change to the natural length of the base material B.

A sheet-like member (for example, a body fluid absorption mat, a therapeutic drug solution, and the like) laminated on an intermediate product of a composite stretchable member that forms a tunnel space [bleaches] by changing the distribution and shape of the tunnel space T depending on the position of the base material It has the effect of improving the bonding with the coated sheet)).

The present invention can reduce the manufacturing cost of the composite stretchable member forming the tunnel space [bleets], and can provide a composite stretchable member that is soft and has a good touch and a good touch, thereby making the composite stretchable member an intermediate product. It contributes to the development of manufacturing industries such as body fluid absorption products such as disposable diapers.

A First base material B Second base material HM Thin film hot melt adhesive Q Application area QQ Fixed area T Tunnel space 1 Non-stretchable sheet supply device 2 Transfer device,
3 Stretching Sheet Deceleration and Feeding Device 4 Bonding Device 5 Drive Roll 6 Rolling Roll 7 Deceleration Drive Roll 8 Tension Roll 9 Rolling Roll 10 Pattern Roll 12 Convex Surface

Claims (8)

A thin film hot melt adhesive is applied to the back surface of the non-stretchable sheet of the first substrate in a pattern distribution by the convex surface of the pattern roll. A transfer process,
Bonding the first base material coated with the thin film hot melt adhesive on the back side to the stretchable sheet of the second base material fed at a traveling speed of 1/2 or less to the first base , Including the bonding process,
A method of manufacturing a composite stretchable member, wherein the distribution of bonding positions and the cross-sectional shape of the tunnel space are set by pattern distribution on the surface of the convex portion of the pattern roll by setting the stretchable nonwoven sheet to a natural length. A thin film hot melt adhesive is applied to the back surface of the non-stretchable sheet of the first substrate in a pattern distribution by the convex surface of the pattern roll. A transfer process,
Bonding the first base material coated with the thin film hot melt adhesive on the back side to the stretchable sheet of the second base material fed at a traveling speed of 1/2 or less to the first base , Including the bonding process,
In the transfer step, the pattern distribution by the convex portion surface of the pattern roll is a narrow straight line in the direction orthogonal to the traveling direction of the first base material, and the bonding / fixing part between the first base material and the second base material is the coated base material Intermittently present in a narrow straight line in the direction orthogonal to the longitudinal direction,
A tunnel space formed by making a stretchable nonwoven sheet into a natural length is intermittently present in a direction perpendicular to a traveling direction of a coated substrate, a method of manufacturing a composite stretchable member having a tunnel space. A thin film hot melt adhesive is applied to the back surface of the non-stretchable sheet of the first substrate in a pattern distribution by the convex surface of the pattern roll. A transfer process,
Bonding the first base material coated with the thin film hot melt adhesive on the back side to the stretchable sheet of the second base material fed at a traveling speed of 1/2 or less to the first base , Including the bonding process,
In the transfer step, the pattern distribution by the convex portion surface of the pattern roll is a narrow straight line in the direction orthogonal to the traveling direction of the first base material, and the bonding portion between the first base material and the second base material is the coated base material longitudinal Intermittently with narrow straight lines in the direction orthogonal to the direction, and divided into multiple sections with different narrow straight line intervals,
The tunnel space formed by making the stretchable nonwoven sheet natural length is intermittently present in the direction orthogonal to the traveling direction of the coated substrate, and is divided into a plurality of application sections in which the cross-sectional shape of the tunnel space is different. A manufacturing method of a compound elastic member which has tunnel space characterized by things. And a feeder for the non-stretchable sheet of the first substrate.
A transfer device for transferring and applying a thin film hot melt adhesive to the first substrate;
A device for supplying a second base elastic sheet;
Including a bonding apparatus for bonding the first and second substrates,
The number of rotations of the drive roller of the second base material supply device is set equal to or less than half the number of rotations of the drive roller of the first base material supply device,
An apparatus for manufacturing an elastic member, wherein the pattern distribution by the surface of the convex portion of the pattern roll of the transfer device is a narrow straight line in the direction orthogonal to the roll rotation direction. And a feeder for the non-stretchable sheet of the first substrate.
A transfer device for transferring and applying a thin film hot melt adhesive to the first substrate;
A device for supplying a second base elastic sheet;
Including a bonding apparatus for bonding the first and second substrates,
The number of rotations of the drive roller of the second base material supply device is set equal to or less than half the number of rotations of the drive roller of the first base material supply device,
The pattern distribution by the convex portion surface of the pattern roll of the transfer device is a narrow straight line in a direction orthogonal to the roll rotation direction, and is divided into a plurality of sections in which the narrow straight lines have different intervals in the roll rotation direction. An apparatus for manufacturing a composite stretchable member having a tunnel space, characterized in that The pattern distribution by the convex surface of the pattern roll of the transfer device is a narrow straight line in the direction orthogonal to the roll rotation direction, and there are a plurality of sections in which the intervals between the narrow straight lines (pitch of the narrow straight line) are different. The manufacturing apparatus of the compound expansion-contraction member which has a tunnel space of Claim 5 characterized by the above-mentioned. The non-stretchable sheet of the first base material and the stretchability of the second base material are laminated via the bonding / fixing portion with a thin film hot melt adhesive, and the non-stretchable sheet of the first base material and the second A composite stretchable member having a tunnel space, characterized in that a tunnel space is formed between the fixed areas between the base and the stretchable sheet. A non-stretchable non-woven sheet and a non-stretch non-woven sheet are laminated via a fixed area with a thin film hot melt adhesive, and between the non-stretch non-woven sheet and the stretch non-woven sheet A tunnel space is formed,
A composite stretchable member having a tunnel space, wherein the fixed area is a narrow straight line in a direction orthogonal to the longitudinal direction of the composite stretchable member, and is intermittently present in the longitudinal direction of the composite stretchable member.

Images