JP5112951B2 - Method for manufacturing tube container with closure membrane - Google Patents

Description

  The present invention relates to a method for manufacturing a container that prevents backflow and air bag of contents and is excellent in storage stability of the contents, and relates to a method for manufacturing a tube container with a closed membrane having a low manufacturing cost and a small number of manufacturing steps. .

  Conventionally, a tube container with a backflow prevention valve has been used as a tube container with a closing membrane that is filled with a drug such as cream or ointment. Moreover, the tube container with a dripping function is used as a tube container filled with chemicals such as eye drops. The tube container with backflow prevention valve is intended to prevent the contents once poured out to the outside and the outside air from being sucked into the container by the restoring force of the container. It is a tube container that has been proposed for the purpose of always dropping a constant amount. Conventionally, as a tube container with a check valve, there is a tube container as shown in FIGS. In the figure, reference numeral 100 denotes a container body, and a backflow prevention valve 103 is mounted or fitted to the mouth portion 102 of the container body 100. A sphere 105 is housed in the sphere storage portion 104 of the backflow prevention valve 103, and the sphere 105 moves between an upper opening 106 and a protrusion 107 formed at the lower portion so as to be movable up and down. Therefore, it has a function as a backflow prevention valve. And the opening of the mouth part 102 of the container main body 100 is closed by screwing a cap (not shown) with the male thread part of the mouth part 102 of the container main body 100. In FIG. 17, a backflow prevention valve 203 is attached or fitted to the mouth portion 202 of the container body 200. And in the valve body storage part 204 of this backflow prevention valve 203, the valve body 205 is manufactured and formed by integral molding with the valve body storage part 204. As shown in FIG. Similarly, a cap (not shown) is screwed into the male screw portion of the mouth portion 202 of the container main body 200 so that the opening of the mouth portion 202 of the container main body 200 is closed.

After the contents are filled in the tube containers 100 and 200 to which the backflow prevention valve is fitted, when the body of the tube containers 100 and 200 is pressed, the spherical body 105 or the tongue-like valve 205 is pushed up, and the contents An object is discharged to the outside. When the pressing of the body parts of the tube containers 100, 200 is stopped, the contents remaining in the spherical body storage part 104 or the valve body storage part 204 are restored by the restoring force of the body parts of the container bodies 100, 200. At the same time as it is pulled back into the interior, the air 105 tries to suck in the outside air. An object is prevented from flowing back into the container main bodies 100 and 200, and air bag back into the container main bodies 100 and 200 is prevented. There is Patent Document 1 as a document of such a conventional check valve.
Japanese Patent Application No. 2006-173570

However, in the conventional tube container with a backflow prevention valve, the spherical body storage portion 104 or the valve body storage portion 204 and the inner shoulder 109 constituting the mouth portion 102 or the inner shoulder 209 constituting the mouth portion 202 are formed separately. As shown in FIGS. 18 and 19, in the final manufacturing process, the spherical body storage portion 104 or the valve body storage portion 204 is replaced with the inner shoulder 109 constituting the mouth portion 102 or the inner shoulder constituting the mouth portion 202, as shown in FIGS. 209 has a drawback that it has to be fitted or mounted in the final manufacturing process, which increases the manufacturing cost and increases the manufacturing process.
The present invention has been made paying attention to such problems, and in a tube container with a backflow prevention valve or a tube container with a drip function, production of a tube container with a closed membrane with a low production cost and a small number of production steps. It is intended to provide a method.

  In order to solve this problem, the solving means of the invention according to claim 1 is characterized in that an inner shoulder with a valve housing portion having a protruding portion is formed at a lower portion of the cylindrical portion of the inner shoulder and is closed on an upper surface of the inner shoulder with a valve housing portion. The valve housing with the membrane sealed, then the inner shoulder with the valve housing, to which the closure membrane was welded, was placed on the mandrel head, the upper mold was placed and the resin flowed in, and the closure membrane was welded An outer shoulder is formed and joined on an inner shoulder with a portion, and a spherical body is press-fitted from a lower portion of a cylindrical portion of the inner shoulder with a valve storage portion.

  The solution of the invention described in claim 2 is to form an inner shoulder with a valve housing portion having a protrusion at the lower portion of the cylindrical portion of the inner shoulder, weld a closing film on the upper surface of the inner shoulder with the valve housing portion, The inner shoulder with a valve storage part to which the closing membrane is welded is placed on the mandrel head, and the shoulder material is dropped onto the inner shoulder with the valve storage part to which the closing membrane is welded and pressed with an upper mold, A method of manufacturing a closed membrane tube container, comprising molding and joining an outer shoulder on an inner shoulder with a valve storage portion welded with a closure membrane, and press-fitting a sphere from the bottom of the cylindrical portion of the inner shoulder with the valve storage portion. It is.

  According to a third aspect of the present invention, there is provided a closed membrane tube container manufacturing method in which a sphere is fixed so as not to move up and down in a cylindrical portion of an inner shoulder with a valve storage portion.

  According to a fourth aspect of the present invention, the inner shoulder and the tongue-like valve body at the lower portion of the inner shoulder cylindrical portion are molded integrally with a valve, and a closing membrane is formed on the upper surface of the valve-equipped inner shoulder. Next, the inner shoulder with a valve housing part to which the closing membrane is welded is placed on the mandrel head, and the upper mold is further placed to flow the resin into the valve housing part where the closing membrane is welded. It is a manufacturing method of a closed membrane tube container characterized in that an outer shoulder is formed and joined on an inner shoulder.

According to the method for manufacturing a tube container with a closed membrane according to the present invention, the manufacturing cost is low and the number of manufacturing steps is small.

  Hereinafter, an example of an embodiment of the present invention will be described with reference to the drawings.

  1-3 is drawing which shows the manufacturing method of Example 1 of this invention. In FIG. 1, 1 is an inner shoulder with a valve storage part. The inner shoulder 1 with a valve storage portion has a cylindrical portion 2, and a protruding portion 3 is formed on the lower portion of the inner peripheral surface of the cylindrical portion 2. This inner shoulder 1 with a valve accommodating part is shape | molded previously, for example with polyethylene resin, polypropylene resin, etc., and is shape | molded by methods, such as injection molding. As shown in FIG. 1, in Example 1, when the dimension of the inner diameter of the cylinder part 2 is a and the dimension between the projecting parts 3 formed at the lower part of the cylinder part 2 is b, the dimension b between the projecting parts 3 is If the inner diameter dimension a of the cylindrical portion 2 is configured to be 70% or more and the formula b / a × 100 ≧ 70% is established, the sphere can be connected to the inner shoulder 1 with a valve storage portion. It can be forcibly inserted from below the protruding portion 3 of the cylindrical portion 2 (see FIG. 5).

  Next, as shown in FIG. 1 and FIG. 2, a gas barrier closing film 4 is welded on the inner shoulder 1 with a valve storage portion, and the lower surface of the sealing film 4 is heated to 150 to 250 ° C. And welded onto the inner shoulder 1. The closing film 4 has, for example, a configuration in which a polyethylene resin or a polyethylene terephthalate resin or the like is laminated on an aluminum foil, or a configuration in which a polyethylene resin or a polyethylene terephthalate resin or the like is laminated on a gas barrier resin such as an ethylene-vinyl alcohol copolymer. is there. When the barrier layer is an aluminum foil, the closing film 4 is manufactured by drawing an aluminum plate material that has been cut into a disk shape in advance, and is laminated with a resin such as polyethylene on at least the front surface or the back surface thereof, thereby providing a valve storage portion. Welding with the inner shoulder 1 can be strengthened.

  Next, as shown in FIG. 3, the inner shoulder 1 with a valve storage portion to which the gas barrier closing film 4 is welded is placed on the mandrel head 5. Around the outer periphery of the mandrel head 5, a body 6 obtained by rolling a laminate sheet having a barrier layer such as an aluminum foil is wound and guided by a lower mold 8. Then, the upper molding die 7 and the lower molding die 8 are lowered onto the mandrel head 5, and the closure film 4 is sandwiched between the molding pin 9 and the convex portion 5 a of the mandrel head 5, and the body portion 6 of the laminate sheet. The outer shoulder 10 is molded by injecting the molten synthetic resin from the upper molding die 7 and cooling it. Then, the front end of the body portion 6 of the laminate sheet, the inner shoulder 1 with a valve housing portion to which the closing film 4 is welded, and the outer shoulder 10 are integrally welded and joined. And as shown in FIG. 5, the head 12 of the tube container with a closure membrane is shape | molded.

  FIG. 4 is a drawing showing a manufacturing method of Example 2 of the present invention. As shown in FIG. 4, the inner shoulder 11 with a valve housing portion to which the gas barrier closing membrane 14 is welded is placed on a mandrel head 15. Then, the shoulder material 19 melted at 200 to 300 ° C. from above is dropped onto the closing film 14. The shoulder material 19 has an annular shape in FIG. 4, but the shape can be arbitrarily selected. The material of the shoulder material 19 can be arbitrarily selected as an outer shoulder such as polyethylene resin, polypropylene resin, polyethylene terephthalate resin, ethylene-vinyl alcohol copolymer resin, and the like. Similarly, around the outer periphery of the mandrel head 15, a body 16 obtained by rolling a laminate sheet having a barrier layer such as an aluminum foil is wound and guided by a lower mold 18. Next, the melted shoulder material 19 that has fallen is strongly pressed with the upper mold 17 to fill the gap between the outer shoulder and the closing film 14, and the tip of the body 16 of the laminate sheet and the closing film 14 are welded. The inner shoulder 11 with valve storage and the outer shoulder are integrally welded and joined. And as shown in FIG. 5, the head 12 of the tube container with a closure membrane is shape | molded.

  As shown in FIG. 5, the molded tube container with a closed membrane according to the first and second embodiments formed in this way is formed into a sphere from the protrusion 3 at the bottom of the cylindrical portion 2 of the inner shoulder 1 with a valve storage portion. 20 is press-fitted into the cylindrical portion 2. The spherical body 20 freely moves up and down within the cylindrical portion 2 and performs a valve function. In addition, the spherical body 20 may have an elliptical cross section or the like that is vertically long (not shown). FIG. 6 shows a head portion 13 of a tube container with a closure membrane showing another form of Embodiment 3 of the present invention. The feature of this head 13 is that FIG. 5 does not have a nozzle part at the mouth part, but has a long nozzle part 13a at the mouth part.

  7 and 8 are drawings showing the manufacturing method of the fourth embodiment. The manufacturing method of the tube container with a closure membrane of this Example 4 is manufactured by molding by the same manufacturing method as that of Example 1, Example 2 or Example 3. The difference from the first embodiment, the second embodiment, or the third embodiment is that the spherical body 30 is fixed so as not to move up and down on the projection 23 of the cylindrical portion 22 of the inner shoulder 21 with a valve storage portion. That is, it is a tube container with a drip function, and the tube container with a drip function is a tube container with a closing membrane proposed for the purpose of cutting the contents well and always dropping a constant amount.

  9-13 is drawing which shows the manufacturing method of Example 5 of this invention. That is, a method of forming the inner shoulder 31 with a valve having a tongue-like valve body formed by integral molding at the lower part of the cylindrical portion of the inner shoulder is shown. As shown in FIG. 9, a tongue-shaped valve body 37 at the bottom of the cylindrical portion of the valve-equipped inner shoulder 31 is integrally formed by a mold including a cavity 32, a plate 33, a core pin 35, and an insert 36. . That is, the resin is poured into the space sandwiched between the cavity 32, the plate 33, the core pin 35 and the insert 36, thereby forming the main body of the inner shoulder 31 with valve, and the lower tapered portion 35 a of the core pin 35 and the insert Resin is poured into the space sandwiched between the upper taper portions 36 a of 36. Since the lower tapered portion 35a of the core pin 35 and the upper tapered portion 36a of the insert 36 are inclined by a certain angle, the outer diameter of the valve body 37 is slightly larger than the diameter of the lower valve hole 38. Can be configured. The resin is poured and then cooled, and the core pin 35 and the insert 36 are separated vertically as shown in FIG. 10, so that the tongue-like valve element 37 is integrally formed at the lower part of the cylindrical portion of the inner shoulder 31 with valve. Molded.

  Next, as shown in FIG. 11, a gas barrier closing film 34 is similarly welded onto the molded inner shoulder 31 with a valve. The sealing film 34 is similarly welded onto the inner shoulder 31 with a valve by heating the lower surface to be welded to 150 to 250 ° C. Similarly, the closing film 34 is formed by laminating polyethylene resin or polyethylene terephthalate resin or the like on the surface of the aluminum foil, or laminating polyethylene resin or polyethylene terephthalate resin or the like on gas barrier resin such as ethylene-vinyl alcohol copolymer. Has been.

  Further, the valved inner shoulder 31 to which the gas barrier closing film 34 is welded is placed on a mandrel head 45 as shown in FIG. Around the outer periphery of the mandrel head 45, a body 46 made by rolling a laminate sheet having a barrier layer such as an aluminum foil is wound and guided by a lower molding die 48. Then, the upper molding die 47 is lowered onto the mandrel head 45, the molding pin 49 is brought into contact with the closing film 34, the tip of the body portion 46 of the laminate sheet is curved inward, and then from the upper molding die 47. The outer shoulder 50 is formed by injecting a molten synthetic resin and cooling, and at the same time, the tip of the body portion 46 of the laminate sheet, the inner shoulder 31 with valve, the closing film 34 and the outer shoulder 50 are integrally formed. By joining, the head part 52 of the tube container with a closure membrane shown in FIG. 14 is shape | molded.

  FIG. 15 is a drawing showing a tube container with a closure membrane according to Embodiment 6 of the present invention. As for the tube shape, an inner shoulder with a valve and an outer shoulder having a closing membrane are integrally joined to a known ordinary tube vessel, and a head portion 62 of the tube vessel with a closing membrane is formed. The manufacturing method is the same as in Example 5. The difference is that the tube container with a closure membrane of Example 6 shown in FIG. 15 is characterized in that a long nozzle portion 62a is formed above the mouth as a feature of the head portion 62 of the tube vessel with a closure membrane. Needless to say, the present invention can be applied to a bottle container provided with a closing film at the mouth, in addition to a tube container with a closing film.

  Since the manufacturing method of the tube container with a closure membrane according to the present invention is low in manufacturing cost and the number of manufacturing steps is small, the manufactured tube container with a closure membrane is inexpensive and can be used in various ways. Further, since gas permeation can be completely prevented, it is possible to prevent deterioration of contents in the distribution and sales process until opening. And as a tube container with a closed membrane having a gas barrier function in addition to the conventional backflow prevention function or dripping function, it is widely suitable for filling medicines, foods, etc., and can be used in various ways.

Sectional drawing which shows Example 1 and Example 2 which concern on this invention, and shows the state by which a closing film is welded on the inner shoulder with a valve storage part. Sectional drawing which shows Example 1 and Example 2 which concern on this invention, and the closure film | membrane was welded on the inner shoulder with a valve storage part. Sectional drawing which shows the manufacturing method (metal mold | die) of Example 1 which concerns on this invention. Sectional drawing which shows the manufacturing method of Example 2 which concerns on this invention. Sectional drawing which shows Example 1 and Example 2 which concern on this invention, and inserts a spherical body in the tube container with a closure membrane. Sectional drawing which shows Example 3 which concerns on this invention, and inserted the spherical body in the tube container with a closure membrane. Sectional drawing which shows Example 4 which concerns on this invention, and inserts a sphere in the tube container with a closure film | membrane of a dripping function type. Sectional drawing which shows Example 4 which concerns on this invention, and inserted the spherical body in the tube container with a closure function type | mold closure membrane. Sectional drawing of the metal mold | die which shows Example 5 which concerns on this invention, and shows the state which shape | molds the inner shoulder with a valve | bulb of Example 5. FIG. . Sectional drawing which shows Example 5 which concerns on this invention, and shows the state which filled the resin with the metal mold | die in shaping | molding of the inner shoulder with a valve. Sectional drawing which shows Example 5 which concerns on this invention, and shows the state by which a closing film is welded on the inner shoulder with a valve. Sectional drawing which shows Example 5 which concerns on this invention, and shows the state by which the closing film was welded on the inner shoulder with a valve. Sectional drawing which shows the manufacturing method (metal mold | die) of Example 5 which concerns on this invention. Sectional drawing which shows the tube container manufactured with the manufacturing method of Example 5 which concerns on this invention. Sectional drawing which shows the tube container with a closure membrane of Example 6 which concerns on this invention. Sectional drawing which shows the tube container with a closure membrane which has the conventional spherical body. Sectional drawing which shows the tube container with a closure membrane which has the conventional tongue piece-like valve body. Sectional drawing which shows the assembly | attachment state of the tube container with a closure membrane which has the conventional spherical body. Sectional drawing which shows the assembly | attachment state of the tube container with a closing membrane which has the conventional tongue piece-like valve body.

Explanation of symbols

1, 11, 21, 31 Inner shoulder with valve housing 2, 22 Cylinder 3, 23 Projection 4, 14, 34 Closure membrane 5, 15, 45 Mandrel head 7, 17, 47 Upper mold 10 Outer shoulder 19 Shoulder Material 20 sphere 37 tongue-shaped valve body

Claims (4)

An inner shoulder with a valve housing portion having a protruding portion is formed on the lower portion of the inner shoulder tube portion, a closing membrane is welded to the upper surface of the inner shoulder with the valve housing portion, and then the closing membrane is welded. The inner shoulder is placed on the mandrel head, the upper mold is further placed, the resin is allowed to flow in, the outer shoulder is molded and joined to the inner shoulder with the valve storage portion to which the closing membrane is welded, and A method for producing a closed membrane tube container, wherein a spherical body is press-fitted from a lower part of a cylindrical part of an inner shoulder with a valve storage part. An inner shoulder with a valve housing portion having a protruding portion is formed on the lower portion of the inner shoulder tube portion, a closing membrane is welded to the upper surface of the inner shoulder with the valve housing portion, and then the closing membrane is welded. The inner shoulder is placed on the mandrel head, and the shoulder material is dropped onto the inner shoulder with the valve storage part welded with the closing membrane and pressed with the upper mold, and the valve storage part with the closure membrane welded is attached. A method of manufacturing a closed membrane tube container, comprising molding an outer shoulder on an inner shoulder, joining the outer shoulder, and then press-fitting a sphere from a lower portion of a cylindrical portion of the inner shoulder with a valve storage portion.     The method for manufacturing a closed membrane tube container according to claim 1 or 2, wherein the spherical body is fixed so as not to move up and down in a cylindrical portion of the inner shoulder with a valve storage portion. An inner shoulder and a tongue-like valve body at the lower part of the inner shoulder cylinder part form an inner shoulder with a valve formed by integral molding, and a closing membrane is welded to the upper surface of the inner shoulder with valve, and then the closing membrane is Place the welded inner shoulder with valve storage on the mandrel head, place the upper mold and flow resin, and put the outer shoulder on the inner shoulder with valve storage to which the closing membrane is welded. A method for producing a closed membrane tube container, comprising molding and joining.

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