JPH0526340U - Synthetic resin container - Google Patents

Abstract

(57) [Summary] [Purpose] A container molded by injection molding,
It is an object of the present invention to provide a container having a multi-layered wall portion. [Structure] A plurality of injection molding machines 10 and 16 are combined, and resin raw materials injected from these injection molding machines 10 and 16 are mixed in layers by the torpedo 15, and thus mixed in layers. By introducing the resin raw material into the cavity 41 of the mold 37, a synthetic resin container 45 having a multi-layered wall portion is provided.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a synthetic resin container, and more particularly to a synthetic resin container suitable for use as a single-use disposable container for filling and supplying food and drinking beverages.

[0002]

[Prior Art]

 BACKGROUND ART Disposable containers made of synthetic resin are widely used to fill and supply various foods. Particularly, transparent or almost transparent synthetic resin containers are widely used.

A predetermined food is filled in such a transparent synthetic resin container, and the upper opening is closed by a lid, and a flange is sealed. In order for the filled food product to be stored for a long period of time, it is preferable that oxygen does not penetrate through the wall surface of the container. Such an oxygen barrier container is formed by pressure forming or vacuum forming a multi-layered sheet.

[0004]

[Problems to be solved by the device]

 In general, when a multilayered sheet is vacuum-formed or pressure-formed to give an oxygen barrier property to a formed container, the transparency of the container is impaired. Further, according to vacuum forming or pressure forming, a surplus material is cut later, so that a skeleton is generated, which causes a loss of raw materials, resulting in an increase in product cost. Also, in the case of cut multi-layered sheets, there is a problem in its processing.

Further, a container formed by vacuum forming or pressure forming has a problem that the shape of the finished container is not properly formed, as compared with a container formed by injection molding. Furthermore, in order to produce a laminated sheet for producing an oxygen barrier sheet by vacuum forming or pressure forming, the extruded sheet must be multi-layered, and equipment for such multi-layering is expensive. However, there is a drawback in that it requires a lot of space and requires a large installation space.

On the other hand, when a container is molded by ordinary injection molding, transparency can be imparted to the container by using polypropylene resin, polystyrene resin, polycarbonate resin, or the like. .. However, when such a resin is used, the oxygen barrier property becomes poor.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a synthetic resin container which is molded by injection molding and has a multilayer structure.

[0008]

[Means for Solving the Problems]

 The present invention is a container formed by molding a synthetic resin, which is molded by injection molding and has a multi-layered wall portion.

[0009]

[Action]

 By performing the injection molding, a skeleton is not generated, waste of raw materials is eliminated, and a container having a proper size and shape can be obtained. In addition, it becomes possible to perform multi-layering at the same time in the injection molding process, which eliminates the need for equipment for multi-layering the extrusion sheet. Further, by selecting the type of raw material, it becomes possible to impart transparency and oxygen barrier property to the container.

[0010]

【Example】

 FIG. 3 shows a molding apparatus for molding a multi-layered container according to an embodiment of the present invention. This molding apparatus includes a main injection molding machine 10 arranged horizontally. The main injection molding machine 10 is composed of a cylinder, and has a screw 11 inside thereof.

An end plate 12 is attached to the tip end side of the cylinder of the molding machine 10, and a joint block 13 is further fixed to the end plate 12. The nozzle 14 is held on the tip side of the joint block 13. A torpedo 15 is arranged in the joint block 13, and this torpedo 15 enables molding of a resin composed of a laminated body.

A sub-injection molding machine 16 is arranged above the joint block 13 and above the torpedo 15, and is connected to the joint block 13 by a connecting block 17. The auxiliary injection molding machine 16 has a plunger 18, and the plunger 18 is pushed by a piston 20 in a cylinder 19. Further, the auxiliary injection molding machine 16 is provided with a hopper 21, and the hopper 21 supplies the raw material to the auxiliary injection molding machine 16 through the raw material supply passage 22.

Next, the torpedo 15 will be described. As shown in FIGS. 4 to 7, the torpedo 15 has a first passage 26 formed of a central hole, and further has a ring-shaped groove 27 and a vertical groove 28 on its outer peripheral surface. And a ring-shaped groove 29. The ring-shaped groove 29 communicates with the second passage 31 via the radial passage 30. The top speed 15 further has eight third passages 33 on the outer peripheral side of the second passage 31 so that the first resin can pass through these third passages 33. There is. That is, the torpedo 15 constitutes a torpedo for two types and three layers of A / B / A.

Such a molding device is connected to the mold 37 shown in FIG. The mold 37 has a female mold 38 and a male mold 39, and a resin passage 40 is further formed in the female mold 38. A cavity 41 communicating with the resin passage 40 is formed between the female mold 38 and the male mold 39.

In the above-mentioned configuration, the screw 11 of the injection molding apparatus shown in FIG. 3 causes the main injection molding machine 10 to inject the first resin, and the first resin is in the joint block 13. Of the torpedo 15 and the third passage 33 on the outer peripheral side.

On the other hand, the second resin supplied from the hopper 21 is pushed by the plunger 18 in the sub-injection molding machine 16 and passes through the resin passage of the connecting block 17 so as to cover the outer peripheral surface of the torpedo 15. It is adapted to be guided to the ring-shaped groove 27. Then, the second resin further flows through the vertical groove 28 and the ring-shaped groove 29 in the radial passage 30 toward the center side, and reaches the confluence portion 32 from the passage 30 through the second passage 31. ing. Then, it is mixed with the first resin in the merging portion 32.

The state of the resins joined at the joining portion 32 is such that the first resin is arranged on the center side, the second resin is arranged on the outer peripheral portion, and the first resin is arranged on the outer peripheral side. As a result, it has a structure of two types and three layers.

The resin mixed by the torpedo 15 so as to form a three-layer structure is injected from the resin passage 40 of the mold 37 into the cavity 41 through the nozzle 14. Therefore, the resin injected into the cavity 41 forms a cup-shaped molding container 45 as shown in FIGS. 1 and 2.

The cup-shaped container 45 is formed into a substantially cup shape, and an upper side thereof is formed into an opening 46, and a flange 47 is formed on a peripheral portion of the opening 46. As is clear from FIG. 1, the wall surface of this container has a three-layer structure, and the inner and outer layers are composed of the first resin 51, and the second resin 52 is layered in the middle. It is distributed.

Here, for example, a polycarbonate resin is used as the first resin, and MXD-6 nylon is used as the second resin. Therefore, the cup-shaped container 45 is a container in which the inner and outer layers are composed of the polycarbonate resin layer 51 and the MXD-6 nylon layer 52 is formed in the middle.

In the container 45 having such a three-layer structure, since the polycarbonate resin layer 51 as the inner and outer layers has a high bending rigidity, the delamination of the second MXD-6 nylon layer 52 in the middle is achieved without providing an adhesive layer. The phenomenon does not occur.

Further, according to the container having the three-layer structure in which the polycarbonate resin layer 51 is used as the inner and outer layers and the MXD-6 nylon layer 52 is formed in the middle, a high oxygen barrier as shown in Table 1 is obtained. It is known that sex can be obtained. Moreover, with such a structure, a transparent synthetic resin container can be provided.

[0023]

[Table 1] According to the container having a three-layer structure in which the inner and outer layers 51 are made of high-impact polystyrene resin and the MXD-6 nylon layer 52 similar to the above-mentioned embodiment is provided in the middle, the delamination phenomenon is eliminated and the oxygen A container with a high barrier property can be obtained. The properties of this container are shown in Table 2. However, due to this combination of raw materials, the container is not transparent.

[0024]

[Table 2]

[0025]

[Effect of the device]

 INDUSTRIAL APPLICABILITY As described above, the present invention relates to a synthetic resin container molded by an injection molding device and having a multi-layered wall portion. Therefore, according to such a container, it becomes possible to impart transparency to the container or to make the container have an oxygen barrier property, especially by combining the materials. In addition, it is not necessary to make the extrusion sheet multi-layered in advance, and equipment for this is not required. In addition, there is no skeleton as in the case of vacuum forming or pressure forming, which eliminates the waste of raw materials. Moreover, since it is molded by injection molding, a container having a proper size and shape can be obtained.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of a synthetic resin container according to an embodiment of the present invention.

FIG. 2 is an external perspective view of the same container.

FIG. 3 is a vertical cross-sectional view of a molding device that molds this container.

FIG. 4 is a vertical sectional view of a torpedo of this molding apparatus.

FIG. 5 is a front view of the same.

FIG. 6 is a rear view of the same.

7 is a sectional view taken along line VII-VII in FIG.

[Explanation of symbols]

 10 Main Injection Molding Machine 11 Screw 12 End Plate 13 Joint Block 14 Nozzle 15 Torpedo 16 Sub Injection Molding Machine 17 Connection Block 18 Plunger 19 Cylinder 20 Piston 21 Hopper 22 Raw Material Supply Channel 26 First Passage (Center Hole) 27 Ring-shaped Groove 28 Vertical groove 29 Ring-shaped groove 30 Radial groove 31 Second passage (small hole) 32 Merging portion 33 Third passage 37 Mold 38 Female 39 Male 40 Resin passage 41 Cavity 45 Cup-shaped container 46 Opening 47 Flange 51 First resin 52 Second resin

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification code Office reference number FI technical display area B65D 3/22 B 6916-3E // B29L 22:00 4F

Claims (1)

[Scope of utility model registration request] 1. A container made of synthetic resin, which is molded by injection molding and has a multi-layered wall portion.