JP2005263246A - Spout and method for manufacturing the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a spout having high barrier property in which a circumferential wall of a spout body is constituted of a multi-layered wall of the layer configuration of a skin layer/an intermediate layer consisting of barrier property resin/a skin layer, the skin layers are free from any breakage or projection of barrier property resin, and the intermediate layer is formed over the entire circumference of the spout body, and a method for manufacturing the same. <P>SOLUTION: The spout comprises a spout body and a joint continuously provided therebelow, and formed of the multi-layered injection molding consisting of a multi-layered wall having the layer configuration of a skin layer/an intermediate layer consisting of barrier property resin/a skin layer. A plurality of legs are continuously provided on a lower side of a joint. A lower portion of each leg radially extends in the axial direction of the spout, and is connected to connectors connected to each other on the axial direction, and a gate is provided on a center of each connector. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a spout attached to the edge of a pouch that contains a liquid and having a barrier property, and a method of manufacturing the spout.

Conventionally, a barrier material layer such as a polypropylene, polyester, polyamide film or other base material and a polyvinyl alcohol film, a saponified product of an ethylene-vinyl acetate copolymer, and low density polyethylene, linear low density polyethylene, metallocene A pouch with a spout is used in which a spout formed by molding polyethylene, polypropylene, or the like is attached to a pouch composed of a multilayer film in which a heat seal material layer such as a polymer is laminated using a catalyst (see, for example, Patent Document 1). ). As a method of molding a molded product with a barrier property, after injecting a base resin such as polypropylene or polyethylene to form a skin layer along the cavity wall surface, injecting a molten barrier resin instead of the base resin There is a multilayer injection molding method in which an intermediate layer made of a barrier resin is formed by allowing a molten barrier resin to flow inside a skin layer formed of a base resin (see, for example, Patent Document 2 and Patent Document 3).
Japanese Patent Laid-Open No. 10-120000 JP-A-4-28507 JP-A-4-49010

  However, in a conventional pouch with a spout, the spout portion is made of a single resin such as polypropylene or polyethylene and has poor barrier properties. Therefore, foods such as jelly and beverages in the pouch have browned near the spout, and neutral foods have a short storage period. Therefore, it is conceivable to form the peripheral wall portion of the spout with a multilayer wall having a layer structure having an intermediate layer made of a barrier resin instead of a single resin such as polypropylene or polyethylene. However, since the spout has a complicated shape, the barrier layer does not reach the entire circumference, and the barrier property is insufficient, or the barrier resin protrudes from the skin layer and adheres to the surface of the joint. The adhesiveness with the pouch may be reduced, or the protruding barrier resin may absorb moisture and the barrier property may be reduced.

  The problem of the present invention is that the peripheral wall portion of the spout body is composed of a multi-layer wall having a skin layer / barrier resin intermediate layer / skin layer structure, and there is no breakage of the skin layer or protrusion of the barrier resin. The object is to provide a spout with a high barrier property in which a layer is formed over the entire periphery of the spout main body and a method for manufacturing the spout.

  The invention according to claim 1 solves the above-described problems relating to the spout, and includes a spout body formed by multilayer injection molding, which includes a spout main body and a joint portion provided below the spout main body. A plurality of legs are connected to each other, and the lower part of each leg is connected to a connecting part that extends radially toward the central axis of the spout and is connected to each other on the central axis, and a gate is formed at the center of the connecting part. The spout is characterized by being provided.

  In the spout according to the present invention, a plurality of legs are continuously provided under the joint, and the lower part of each leg extends in a radial direction toward the center axis of the spout and is connected to each other on the central axis. By being connected and the gate being provided at the center of the connecting portion, an intermediate layer is formed over the entire circumference of the peripheral wall of the spout main body, and it is characterized by high barrier properties and good product appearance. Therefore, a barrier material layer such as a film made of a base material such as polypropylene, polyester or polyamide film and a polyvinyl alcohol film, a saponified product of an ethylene-vinyl acetate copolymer, and low density polyethylene, linear low density polyethylene, metallocene catalyst It is attached to a barrier pouch consisting of a multilayer film in which a heat sealing material layer such as a polymer is used to provide excellent barrier properties, and foods such as jelly and beverage in the pouch are browned near the spout or neutral It is possible to provide a pouch with a spout that eliminates the conventional drawback of food having a short storage period.

  Claim 2 solves the problem relating to the above-described manufacturing method. In the manufacturing method of a spout formed by multi-layer injection molding, which includes a spout main body and a joint portion provided below the spout main body, A plurality of legs are provided below, and the lower part of each leg has a cavity having a shape that extends in the radial direction toward the central axis of the spout and is connected to a connecting portion that is connected to each other on the central axis. A mold gate is provided at a position corresponding to the part, a base resin is injected into the cavity from this gate, a skin layer is formed along the cavity wall surface, and then a molten barrier resin is injected instead of the base resin. The intermediate layer is formed by allowing the molten barrier resin to flow inside the skin layer formed by the base resin, and is composed of a multilayer wall having a layer structure of skin layer / barrier resin. The spout method for producing and forming a peripheral wall of the outlet and gist.

  According to the manufacturing method of the present invention, a plurality of legs are connected under the joint, and the lower portions of the legs extend radially toward the central axis of the spout and are connected to each other on the central axis. After forming a skin layer along the cavity wall surface by injecting the base resin into the cavity from the gate, the base resin is formed. Instead of injecting a molten barrier resin, the molten barrier resin flows inside the skin layer formed by the base resin to form an intermediate layer, and the intermediate layer / skin made of skin layer / barrier resin By forming the peripheral wall portion of the spout consisting of a multi-layer wall with a layer structure, it has an intermediate layer made of a barrier resin over the entire periphery of the peripheral wall of the spout main body, and has a high barrier property and good product appearance. Outlet It can be produced.

  The spout of the present invention has a plurality of legs connected continuously under the joint, and the lower part of each leg is connected to a connecting portion that extends radially toward the center axis of the spout and is connected to each other on the central axis. The spout body has an intermediate layer made of a barrier resin over its entire circumference, and has an excellent barrier property and is attached to a barrier pouch. Thus, it is possible to provide a pouch with a spout that eliminates the conventional disadvantage that foods such as jelly and beverages in the pouch are browned near the spout and neutral food has a short storage period.

  The spout manufacturing method according to the present invention includes a spout main body and a spout formed by multilayer injection molding comprising a spout main body and a joint portion provided below the spout main body. The lower part of each foot has a cavity with a shape extending radially toward the central axis of the spout and connected to a connecting part connected to each other on the central axis, at a position corresponding to the connecting part. A base resin was formed by providing a mold gate, injecting a base resin into the cavity from the gate, forming a skin layer along the cavity wall surface, and then injecting a molten barrier resin instead of the base resin. The present invention is characterized in that an intermediate layer is formed by flowing inside a skin layer, and a peripheral wall portion of a spout consisting of a multilayer wall having a layer structure of skin layer / barrier resin is formed. According to the production method, there is no tearing of the skin layer, and the spout has an intermediate layer made of a barrier resin on the peripheral wall of the spout, and has a high barrier property and a good product appearance. it can. And by attaching the spout manufactured in this way to a barrier-type pouch, foods such as jelly and beverages in the pouch are browned near the spout, or neutral food has a short storage period. It is possible to provide a pouch with a spout that eliminates the drawbacks.

  Embodiments of the present invention will be described below with reference to the drawings. 1 to 4 show a spout of the present invention, FIG. 1 is a front view, FIG. 2 is a plan view, FIG. 3 is a bottom view, and FIG. 4 is a side view.

  The spout according to the present invention includes a spout main body 1 and a joint portion 6 provided below the spout main body 1. The spout main body 1 has a round tube portion 1a, and a screw thread 2 is provided on the round tube portion 1a. This thread 2 can be provided with a notch 2a. By providing this notch 2a, since the washing water or the like flows down without staying in the thread portion in the process of cleaning the spout portion, the spout portion can be efficiently cleaned. The spout is provided with three flanges 3, 4, and 5.

  As shown in FIG. 3, the central portion of the joint portion 6 swells in an annular shape, and four legs 7a, 7b, 7c, and 7d are continuously provided at intervals of 90 degrees under the annularly swelled portion. Yes. The lower part of each foot extends in the radial direction toward the central axis of the spout and is connected to connecting parts 8a, 8b, 8c and 8d which are connected to each other on the central axis, and connected to the connecting parts 8a, 8b, 8c and 8d. A gate 9 is provided at a corresponding position. In this embodiment, the number of legs is four, but the number of legs may be two or three. However, it is preferable to provide four legs in order to supply the molding material, that is, the base register and the barrier resin over the entire circumference and form the intermediate layer over the entire circumference of the peripheral wall of the spout body.

  FIG. 5 is a longitudinal sectional view of the spout, and FIG. 6 is a transverse sectional view taken along the line AA in FIG. FIG. 7 is a cross-sectional view taken along line BB in FIG. As shown in FIGS. 5 to 7, the spout of the present invention is composed of a multilayer wall having a layer structure of skin layer 11 / intermediate layer 12 / barrier layer 11 made of a barrier resin.

  In the spout of the present invention, the gate 9 is located at the bottom of the spout, and the base resin and the barrier resin are injected into the cavity from the gate 9 through the connecting portions 8a8b, 8c, and 8d in the radial direction. As a result of the injection of the base resin and the barrier resin into the cavity through the connecting portions 8a8b, 8c, and 8d, a portion that does not completely adhere as shown in FIG. 7 is formed. An intermediate layer 12 is formed. Further, as shown in FIG. 6, the intermediate layer 12 is formed over the entire circumference of the peripheral wall portion of the container body 1 above the flange 4. Therefore, it is attached to a barrier-type pouch, and foods such as jelly and beverages in the pouch are browned near the spout, and neutral food has a short shelf life, eliminating the conventional shortcomings. Can be provided.

  Next, the manufacturing method of the spout of this invention is demonstrated. As shown in FIG. 3, the central portion of the joint portion 6 swells in an annular shape, and four legs 7a, 7b, 7c, 7d are continuously provided at intervals of 90 degrees under the annularly swelled portion. The lower portion of the tube has a cavity connected to the connecting portions 8a, 8b, 8c, 8d extending in the radial direction toward the central axis of the spout and connected to each other on the central axis, and the connecting portions 8a, 8b, 8c. , 8d is a vertical mold provided with a gate at a position corresponding to 8d. First, a base resin such as molten polypropylene or polyethylene is injected from the gate into the cavity. When the melted base resin comes into contact with the cavity wall surface 13, it immediately cools and solidifies into a skin-like state, forming a so-called skin layer 11 along the cavity 13 as shown in FIG. The injected molten base resin flows through the skin layer 11 so as to press the cavity wall surface 13 while proceeding forward. Next, when the molten barrier resin is injected instead of the base resin, it flows through the base resin still in the molten state, and as shown in FIG. 9, the skin layer 11 / intermediate layer 12 made of the barrier resin / skin layer 11 A multilayer wall having a layer structure of is formed.

  As the barrier resin, a polyvinyl alcohol film, a saponified ethylene-vinyl acetate copolymer, MX nylon, or the like can be used.

  In the production method of the present invention, it is necessary to adjust the viscosity of the base resin, the resin pressure, the filling speed, the mold temperature, and the like so that the injection amount of the base resin can sufficiently reach the mouth of the spout. In addition, it is necessary to set a filling speed appropriately, lower a mold temperature, and form a firm, non-breaking skin layer with a moderate thickness.

  In addition, if the length of the foot is long, it is difficult for the resin to reach the mouth of the spout body. It is desirable to keep the length of the foot approximately the same as the height of the joint.

  FIG. 10 shows a pouch with a spout attached with a spout of the present invention.

  The spout of the present invention is attached between two sides of the edge of the barrier pouch 10 and is thermally bonded to the inner surface of the pouch. As a structure of the material of the barrier pouch 10, a substrate, a barrier material for protecting contents, and an inner surface material having heat sealability can be applied. The base material is selected from materials having printability, strength, heat resistance, and the like, and preferably a stretched film formed by forming a resin such as various types of thin paper, polypropylene, polyester, polyamide, etc. can be applied. . Moreover, as a barrier material, a barrier film such as a film formed by forming a film of polyvinyl alcohol, a film formed by forming a resin formed of a saponified ethylene-vinyl acetate copolymer, a metal foil such as aluminum, and the various types described above A film having a moisture-proof coating such as vinylidene chloride applied thereto can be applied. Furthermore, as a barrier material, a film obtained by directly depositing a metal alone or an oxide such as silicon or aluminum on a base film can be used. In addition, the heat sealing material is polymerized using a material having the necessary strength as a pouch, for example, low density polyethylene, linear low density polyethylene, or metallocene catalyst, without affecting the taste of the contents. Examples thereof include polyolefin and ethylene-vinyl acetate copolymer. The spout of the present invention can be used by being mounted on various types of barrier pouches such as a flat bag, a self-supporting bag (stand pack), and a gusset pouch.

  Further, as a cap attached to the spout of the present invention, for example, a pouch with a spout having a very high barrier property is provided by using a barrier cap in which a barrier thin film made of aluminum foil or the like is attached to the top plate of the cap. can do.

  The spout of the present invention can be used not only as a spout attached to a bag-like container for filling liquid drinks such as sports drinks, juices, and jelly, but also as a spout of a volatile cosmetic container. .

It is a front view of the spout of the present invention. It is a top view of the spout shown in FIG. It is a bottom view of the spout shown in FIG. It is a side view of the spout shown in FIG. It is a longitudinal cross-sectional view of the spout of the present invention. It is sectional drawing cut | disconnected by the AA line of FIG. It is sectional drawing cut | disconnected by the BB line of FIG. It is a figure which shows the state which injected the base resin in the cavity and formed the skin layer. It is a figure which shows the state which formed the intermediate | middle layer which consists of barrier resin in the inside of a skin layer. It is a top view of the barrier type pouch equipped with the spout of the present invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Spout main body 1a Round cylinder part 2 Thread 2a Thread notch 3 1st flange 4 2nd flange 5 3rd flange 6 Joining part 7a A foot 7b A foot 7c A foot 7d A foot 8a Connecting part 8b Connecting part 8c Connecting part 8d Connecting part 9 Gate 10 Pouch 11 Skin layer 12 Intermediate layer 13 Cavity wall

Claims (2)

  In a spout formed by multi-layer injection molding consisting of a spout body and a joint portion provided below the spout body, a plurality of feet are continuously provided under the joint portion, and the bottom of each foot is poured in the radial direction. A spout characterized in that it is connected to connecting portions that extend toward the central axis of the outlet and are connected to each other on the central axis, and a gate is provided at the center of the connecting portion. In a method for manufacturing a spout formed by multi-layer injection molding, which comprises a spout body and a joint portion provided below the spout body, a plurality of feet are continuously provided under the joint portion, and the bottom of each foot is a radius. It has a cavity with a shape that extends in the direction toward the central axis of the spout and is connected to a connecting part that is connected to each other on the central axis, and a mold gate is provided at a position corresponding to the connecting part. After injecting the base resin and forming the skin layer along the cavity wall surface, injecting the molten barrier resin instead of the base resin, the molten barrier resin is formed inside the skin layer formed by the base resin. A method for producing a spout characterized by forming an intermediate layer by flowing to form a peripheral wall portion of a spout formed of a multilayer wall having a layer structure of a skin layer / barrier resin and comprising an intermediate layer / skin layer

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