JP5776331B2 - Tube container mouth manufacturing equipment - Google Patents

Description

  The present invention relates to compression molding for forming a mouth part (a mouth part and a shoulder part) of a tube container. In particular, the present invention relates to an apparatus for manufacturing a mouth portion of a laminated tube container.

  Synthetic resin tube containers are widely used in cosmetics, foods, pharmaceuticals, and the like. Various methods are known for producing this type of synthetic resin tube container.

  For example, a cylindrical body member is formed in advance using a flexible material, and after inserting the body member into a mold, the mouth is injection-molded and fused to the body member to be integrated. There is a method of manufacturing a tube container (Patent Document 1).

  In addition, after the piece with the mouth portion injection-molded into a bottomed cylindrical shape is preheated, the mouth portion is attached to the blow mold, and then the body portion of the piece is stretch-molded in the axial direction by the stretching rod and blown. There is a method for producing a tube container by stretching in the radial direction by molding (Patent Document 2).

  However, in the former case, it requires a process for accurately positioning and inserting the cylindrical body member in the mold and a process for injection-molding the mouth part and integrating it with the body member. The problem is that a complicated apparatus becomes complicated and expensive. Further, in the latter blow molding, there is a problem that the thickness of the mouth portion (mouth portion) is difficult to be uniform.

  Depending on the contents to be stored, gas barrier properties are required. Since a conventional synthetic resin tube container uses a single layer or multiple layers of polyethylene, it is necessary to laminate a gas barrier layer. Therefore, a laminate tube container is formed by using a laminate material in which a gas barrier layer is laminated to form a tube container.

  As a method of manufacturing a laminated tube container, there is a tube container mouth manufacturing apparatus 50 as shown in FIG. A body member 18 made of a laminated body laminated in advance is formed into a cylindrical shape and inserted into the body portion mold 2. The trunk part mold 2 is connected to the mouth part molding mold 12. The mouth forming cavity 11 for forming the mouth part is composed of a mouth part forming cavity 9 and a shoulder part forming cavity 10. A ring-shaped resin lump 19 is inserted into the mouth-forming cavity 11 in a heated state, and is pressed by the pressing core 3 having a shape with respect to the mouth-forming cavity to perform compression molding. An apparatus for producing a laminated tube container for forming a mouth portion.

  The mouth molding cavity 11 is provided with a mouth pin 13 at the center thereof. A center chip 5 is provided at the center of the front end surface of the pressing core 3. When the mouth part is molded, the pressing core 3 is lowered, and the center chip 5 and the tip surface of the mouth pin 13 come into contact with each other, and then the pressing core is further lowered and compression-molded to form the mouth part. Usually, the mouth pin and the tip surface of the center chip are each flat. Since each tip surface is a flat surface, it may deviate from the center when contacted. FIG. 5 shows an example when the intraoral pin and the center chip are displaced.

  FIG. 6 is an explanatory view showing an example of the mouth portion 20 compression-molded in the state shown in FIG. As shown in FIG. 6, there is a problem that the mouth portion 21 and the shoulder portion 22 forming the mouth portion 20 each have a difference in resin thickness, that is, uneven thickness.

  If uneven thickness in the circumferential direction of the mouth portion 21 or uneven thickness of the shoulder portion 22 occurs, a seal failure occurs in the Lectra seal to the mouth portion in a later process, and the contents are leaked due to leakage of the contents or deterioration of gas barrier properties. There are problems such as deterioration.

  Therefore, a method for stably producing the mouth portion of the laminated tube container is desired.

Japanese Patent Publication No. 37-1987 Japanese Patent Laid-Open No. 55-118834

  In view of the problems of the background art, the present invention is to provide a manufacturing method in which uneven thickness does not occur in the mouth portion of a laminated tube container.

  In order to solve the above problems, the inventors have intensively studied and completed the present invention.

In the invention according to claim 1 of the present invention, a tube is formed in a mold that forms a tube container having a mouth forming cavity in which a lump of a ring-shaped resin is previously inserted, and a mouth pin is provided in the center. A cylindrical body member and clamping the mold,
Having a shape for the mouth forming cavity, and having a pressing core that expands and contracts in the axial direction on the inside of the body member;
With a center tip in the center of the front end surface of the pressing圧Ko A,
In the mouth part manufacturing apparatus for a tube container, in which the pressing core presses the center part of the distal end surface of the mouth pin to form the mouth part,
In the central portion of the tip surface of the mouth pin, a concave portion comprising a cylindrical concave portion having a taper in the inner direction, and a conical concave portion drilled in connection with the cylindrical concave portion,
An apparatus for manufacturing a mouth portion of a tube container, comprising a convex portion fitted into a concave portion comprising the cylindrical concave portion and the conical concave portion at a central portion of a front end surface of the center chip.

The invention according to claim 2 of the present invention is characterized in that the mouth portion of the tube container according to claim 1, wherein an air vent hole is provided in a central portion of the concave portion including the cylindrical concave portion and the conical concave portion. It is a manufacturing device.

According to the first aspect of the present invention, a cylindrical shape is formed in a mold for forming a tube container having a mouth forming cavity in which a mouth-shaped pin having a ring-shaped resin lump inserted therein in advance is provided. Insert the body member, and clamp the mold,
Having a shape for the mouth forming cavity, and having a pressing core that expands and contracts in the axial direction on the inside of the body member;
With a center tip in the center of the front end surface of the pressing圧Ko A,
In the mouth part manufacturing apparatus for a tube container, in which the pressing core presses the center part of the distal end surface of the mouth pin to form the mouth part,
In the central portion of the tip surface of the mouth pin, a concave portion comprising a cylindrical concave portion having a taper in the inner direction, and a conical concave portion drilled in connection with the cylindrical concave portion,
The center tip is provided with a convex portion that fits into a concave portion composed of the cylindrical concave portion and the conical concave portion at the center portion of the front end surface of the center chip.
Misalignment can be prevented by fitting the concave portion formed of the cylindrical concave portion and the conical concave portion at the center portion of the distal end surface of the mouth pin and the convex portion at the central portion of the distal end surface of the center chip. Therefore, uneven thickness at the mouth portion is eliminated, and Lectra seal to the mouth portion can be stably performed. This is effective for manufacturing a laminated tube container that imparts gas barrier properties.

According to a second aspect of the present invention, an air vent hole is provided in the central portion of the concave portion including the cylindrical concave portion and the conical concave portion . By providing an air vent hole in the central part of the concave part composed of the cylindrical concave part and the conical concave part, gas generated from the resin can be discharged during compression molding. The gas accumulated in the mouth forming cavity can be discharged. This eliminates uneven thickness of the mouth portion and foaming in the resin, thereby forming a mouth portion that does not adversely affect the Lectra seal to the mouth portion.

It is explanatory drawing which shows an example of the opening part manufacturing apparatus of the tube container of this invention. It is explanatory drawing which shows an example of the intraoral pin and center chip | tip shown in FIG. It is explanatory drawing which shows an example of the opening | mouth part shape | molded by FIG. It is explanatory drawing which shows an example of the opening part manufacturing apparatus of the conventional tube container. It is explanatory drawing which shows an example when the intraoral pin and center chip | tip shown in FIG. 4 have shifted | deviated. It is explanatory drawing which shows an example of the opening | mouth part shape | molded by FIG. It is explanatory drawing which shows an example of the laminate tube container shape | molded by FIG.

  Hereinafter, embodiments for carrying out the present invention will be described.

FIG. 1 is an explanatory view showing an example of the mouth container manufacturing apparatus 40 of the present invention. In order to form the body part in advance, the cylindrical body member 18 is inserted into the body part mold 2. The body part mold 2 is connected to the mouth part mold 12. The mouth molding cavity 11 includes a mouth part molding cavity 9 and a shoulder molding cavity 10, and includes an intraoral pin 13 at the center thereof.
A ring-shaped resin mass 19 formed in advance is inserted into the cavity 11 for forming the mouth portion. It is inserted into the ring-shaped center in a state where the intraoral pin is arranged.

  A pressing core 3 having a shape with respect to the cavity for forming the mouth portion and extending and contracting in the axial direction inside the body member 18 is provided. The pressing core is connected to the compression molding cylinder 1 and includes a tapered surface 4 and a center tip 5 at the center of the tip thereof in order to mold the mouth.

At the center of the distal end surface of the intraoral pin 13, there is provided a recess 14 composed of a cylindrical recess having a taper in the inner direction and a conical recess drilled in connection with the cylindrical recess.
In addition, the center chip 5 includes a convex portion 6 including a cylindrical convex portion and a conical convex portion connected to the cylindrical convex portion so as to be fitted to the concave portion 14 at the center portion of the tip surface. .

  After the pressing core 3 connected to the compression molding cylinder 1 is lowered and the tip surfaces of the center chip 5 and the mouth pin 13 are in contact with each other, the pressing core 3 is further lowered and compression-molded to mold the mouth. When this molding is performed, the concave portion 14 at the center portion of the distal end surface of the mouth pin 13 and the convex portion 6 at the central portion of the distal end surface of the center chip 5 can be fitted to each other to prevent displacement.

FIG. 2 is an explanatory diagram showing an example of the intraoral pin and the center chip shown in FIG. It is explanatory drawing which shows an example of the front end surface of the intraoral pin 13 and the center chip | tip 5. FIG. A concave portion 14 comprising a cylindrical concave portion 15 having a taper in the inner direction and a conical concave portion 16 drilled in connection with the cylindrical concave portion 15 is provided at the center of the distal end surface of the mouth pin 13. Yes. Further, in the center portion of the front end surface of the center chip 5, a convex portion 6 including a cylindrical convex portion 7 and a conical convex portion 8 connected thereto is provided in order to fit the concave portion 14. By fitting the convex portions 6 and the concave portions 14, it is possible to prevent a shift when the center chip 5 and the intraoral pin 13 are in contact with each other.

  Further, the taper angle of the cylindrical convex portion 7 of the center chip 5 is set to 0.5 to 1.0 ° inward, and the taper angle of the cylindrical concave portion 15 of the mouth pin 13 is set to +0. Set to 1 to 0.3 °. Moreover, it becomes easier to fit than the taper angle of the conical recessed part 16 is set to +0.5 to 1.0 ° from the taper angle of the conical convex part 8. Since the concave portion 14 at the center of the intraoral pin 13 and the convex portion 6 at the central portion of the center chip 5 can be more easily fitted, it is possible to further prevent displacement.

  FIG. 3 is an explanatory view showing an example of the mouth 20 formed in FIG. It is explanatory drawing which shows an example of the shape | molded mouth part. The mouth portion 21 and the shoulder portion 22 forming the mouth portion 20 have no uneven thickness, and the screw thread portion 23 screwed with the cap has no uneven thickness.

  By using the tube container mouth manufacturing apparatus of the present invention, uneven thickness does not occur in the mouth, so in the Lectra seal to the mouth part in the post-process, the seal is stable, content leakage and gas barrier properties A laminated tube container having no deterioration of contents due to a decrease can be manufactured.

  An air vent hole 17 is provided at the center of the recess 14. By providing the air vent hole 17, the gas generated from the resin can be discharged. A gas reservoir in the mouth forming cavity 11 can be eliminated, and a laminated tube container without uneven thickness can be manufactured.

  The present invention will be described in more detail.

  As the body member 18 used in the present invention, a laminate material in which films having gas barrier properties are laminated can be used. As the gas barrier film, a metal foil such as aluminum, a gas barrier film such as an ethylene-vinyl alcohol copolymer resin, a polyethylene terephthalate film on which silicon oxide, alumina, or the like is vapor-deposited can be used.

  For example, as a constitution, polyethylene film / polyethylene layer / milk white polyethylene film / polyethylene layer / aluminum foil / adhesion layer / polyethylene film, polyethylene film / polyethylene layer / milk white polyethylene film / polyethylene layer / ethylene-vinyl alcohol copolymer film / adhesion Layer / polyethylene film, polyethylene film / polyethylene layer / milk white polyethylene film / polyethylene layer / silicon oxide deposited polyethylene terephthalate film / adhesive layer / polyethylene film, polyethylene film / polyethylene layer / milk white polyethylene film / polyethylene layer / alumina deposited polyethylene terephthalate film / Examples thereof include an adhesive layer / polyethylene film. If transparency is required, non-colored polyethylene resin may be used instead of milk white polyethylene resin. As the gas barrier film having transparency, an ethylene-vinyl alcohol copolymer film, a polyethylene terephthalate film on which silicon oxide, alumina, or the like is vapor-deposited may be used.

  As the mouth molding resin, polyolefin resins such as polyethylene resin and polypropylene resin can be used. In particular, milk white polyethylene resin is used. Moreover, you may add an antistatic agent etc. from required quality. Further, if transparency is required, an uncolored polyethylene resin may be used instead of the milk white polyethylene resin.

  A ring-shaped resin lump 19 is formed by an extruder from the mouth molding resin, and is inserted into the mouth molding cavity 11. In the center of the ring-shaped resin lump 19, the mouth pin 13 is inserted.

  When the ring-shaped resin lump 19 is inserted into the mouth molding cavity 11, it is pressed by the compression molding cylinder 1 in a state where the cylindrical body member 18 is inserted into the body mold 2 and clamped. When the core 3 is lowered and the convex portion 6 at the center of the center chip 5 and the concave portion 14 at the center of the mouth pin 13 are fitted, the pressing core 3 is further lowered to perform compression molding, and the mouth 20 is molded. Is done. Further, the laminated tube container 60 is formed by thermally bonding the polyethylene film on the inner surface of the cylindrical body member 18 and a mouth molding resin, for example, milk white polyethylene resin. The mouth portion 20 without uneven thickness is formed. Thereafter, in order to close the opening 24 of the mouth portion 20, the mouth portion 21 is Lectra sealed. Lectra seal can be made stably.

  FIG. 7 is an explanatory view showing an example of a laminated tube container 60 formed by the tube container mouth manufacturing apparatus of the present invention. The polyethylene film on the inner surface of the barrel member 18 and a mouth molding resin, for example, milk white polyethylene resin, are thermally bonded, and the barrel member 18 and the shoulder portion 22 are integrated. A laminate tube container 60 is formed.

  Further, the shoulder 22 can be provided with a gas barrier property. Laminate with a polyethylene layer laminated on one or both sides of a metal foil such as aluminum, an ethylene-vinyl alcohol copolymer film, or a vapor-deposited polyethylene terephthalate film such as silica or alumina, is pre-extracted according to the shoulder dimensions. The extracted piece is inserted into the mouth forming cavity 11 and placed on the ring-shaped resin lump. Then, by performing compression molding, the laminate material is disposed on the shoulder portion, and gas barrier properties can be added. If transparency is required, a polyethylene terephthalate film on which an ethylene-vinyl alcohol copolymer film, silica, alumina or the like is vapor-deposited can be used.

  The tube container mouth manufacturing device of the present invention uniformly compresses the mouth by fitting the convex portion at the center of the tip surface of the center chip and the recess at the center of the tip surface of the mouth pin. be able to. Further, by providing an air vent hole at the center of the concave portion of the mouth pin, it is possible to eliminate a gas reservoir in the mouth forming cavity and to manufacture the mouth portion of the tube container in which uneven thickness does not occur. A laminated tube container can be stably manufactured by the tube container opening manufacturing apparatus of the present invention.

DESCRIPTION OF SYMBOLS 1 Compression molding cylinder 2 Body part mold 3 Pressing core 4 Tapered surface 5 Center chip 6 Convex part 7 Cylindrical convex part 8 Conical convex part 9 Cavity part for mouth part molding 10 Cavity part for shoulder part 11 For mouth part molding Cavity 12 Mouth mold 13 Inner pin 14 Recess 15 Cylindrical recess 16 Conical recess 17 Air vent 18 Body member 19 Ring-shaped resin lump 20 Mouth 21 Mouth part 22 Shoulder 23 Screw thread 24 Open Section 25 Descent direction 26 Shift direction 40 Tube container mouth manufacturing apparatus of the present invention 50 Conventional tube container mouth manufacturing apparatus 60 An explanatory view showing an example of a laminated tube container manufactured by the mouth manufacturing apparatus of the present invention

Claims (2)

A cylindrical body member is inserted into a mold that forms a tube container having a mouth molding cavity that is provided with a mouth pin in the center and is previously inserted with a ring-shaped resin lump. As well as mold clamping
Having a shape for the mouth forming cavity, and having a pressing core that expands and contracts in the axial direction on the inside of the body member;
With a center tip in the center of the front end surface of the pressing圧Ko A,
In the mouth part manufacturing apparatus for a tube container, in which the pressing core presses the center part of the distal end surface of the mouth pin to form the mouth part,
In the central portion of the tip surface of the mouth pin, a concave portion comprising a cylindrical concave portion having a taper in the inner direction, and a conical concave portion drilled in connection with the cylindrical concave portion,
An apparatus for manufacturing a mouth portion of a tube container, comprising a convex portion that fits into a concave portion comprising the cylindrical concave portion and the conical concave portion at a central portion of a tip surface of the center chip. The mouth portion manufacturing apparatus for a tube container according to claim 1, further comprising an air vent hole in a central portion of the concave portion including the cylindrical concave portion and the conical concave portion .

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