JPS624057A - Plastic vessel - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a plastic container consisting of a double-walled main body, a lid, and a hinge that connects these together, and the container surface is made of a fiber layer. Relating to a manufacturing method.

[Conventional technology]

BACKGROUND ART It has been known to attach a fiber layer to the surface of a container such as a bag for the purpose of improving the surface appearance, texture, etc.

[Problem to be solved by the invention]

In the conventional manufacturing method as described above, it is difficult to uniformly adhere the fiber layer to the surface of the container, and the adhesion work is also difficult.

The present invention was devised in view of the above-mentioned drawbacks, and provides a method for manufacturing a plastic container in which a fiber sheet is laminated during molding of the container, and the surface of the container is made of a fiber layer.

[Means for solving problems]

The present invention involves extruding a parison between opposingly spaced molds, closing a fiber sheet between the mold and the parison, and then extruding the two opposing walls of the parison and the fiber sheet in the compression section of the mold cavity. The fiber sheets are laminated using the heat and adhesiveness of the molten parison that has been clamped and compressed together, and the molten parison is inserted into the small gaps between the fiber sheets by the pressure applied at the compression part to form a thin hinge. Pressurized fluid is blown into the parison to expand the parison and form it into the external shape of the main body and lid in the cavity, and the heat, adhesiveness and expansion pressure of the parison cause the fiber sheet to form the main body and lid. The present invention relates to a method for manufacturing a plastic container, which is characterized by lamination on the surface.

[Effect]

As a means of laminating fiber sheets on the main body and lid of a plastic container, the blowing expansion pressure of pressurized fluid (usually 3 to 7 kg) is used.
/cflI), whereas mold clamping pressure, which is completely different from the blowing expansion pressure of pressurized fluid, is used as a means of laminating fiber sheets on the hinge of a plastic container that requires repeated bending characteristics. (Usually 50-1000Kg/c
This is carried out in a compression section formed opposite to the mold cavity, on which the compressor (fll) acts directly.

The two opposing walls of the parison and the fiber sheet are then integrated into a single, laminated, thin-walled hinge, which resists the heat and stickiness of the parison in its molten state. It is formed by inserting the parison in a molten state into the fine gaps of the fiber sheet due to the extremely high compression force in the compression section where the pressurizing force from high-pressure mold clamping is directly applied. Therefore, the repeated bending characteristics of the manufactured hinge are far superior to those obtained by simply laminating other reinforcing sheets by means such as welding or gluing. In addition, if the pressure applied to the lamination is extremely high, the parison bitten into the surface of the laminated fiber sheets from the opposite side may be partially exposed, or the texture of the fiber sheets themselves may be impaired; however, in the present invention, The pressure force when laminating the fiber sheet on the surface of the body or lid is much lower than the pressure force when forming the hinge, so the pressure of the fiber sheet laminated on the surface of the body or lid of the resulting plastic container is A plastic container with high commercial value without spoiling the appearance can be obtained.

〔Example〕

Hereinafter, the present invention will be explained based on examples.

In the figure, 1 and 2 are split-type molds, and 3 is an extrusion head 4.
It is a parison that is extruded more. One of the molds 1.2 has concave cavities 1a and lb forming the outer walls of the main body and the lid, and a compression part IC forming the hinge, and the other mold 2 Inside, there are convex cavities 2a, 2b which form the inner walls of the main body and lid, facing the concave cavities 1a, lb, and a compression part 2C, which forms a hinge, facing the compression part IC. Further, 5 is a blow bin for blowing pressurized fluid such as compressed air into the parisphere 3, 6 is an exhaust hole for exhausting the fluid in the cavity to the outside, and 7 is a fiber sheet held by clamps 8.

As shown in FIG. 1, thermoplastic plastics such as polyethylene and polypropylene are melt-kneaded in an extruder (not shown) and the molten parison is passed through an extrusion head 4 into a mold 1.2 which is spaced apart from each other. Extrude between. And the main body,
A fiber sheet 7 held by clamps 8 is placed between a mold 2 and a parison 3 that form the inner wall of the lid. Then, both molds 1.2 are closed, and the blow pin 5 is inserted into the parisphere 3. Pressurized fluid such as compressed air (3 to 14K
g/7). At the same time, the fluid in the cavity may be forcibly discharged to the outside from the exhaust hole 6. In this way, parison 3 expands into a shape corresponding to the cavity,
The hollow double-walled main body 9 is compressed in the cavities 1a and 2a, the hollow double-walled lid 10 is compressed in the cavities 1b and 2b, and the parison 3 is compressed in the compression parts IC and 2C to form a thin hinge. 11 is formed. During this molding, the fiber sheet 7 located between the mold 2 and the parison 3 comes into contact with the surface of the expanding parison 3, and the cavities 2a, 2
At b, the inner walls 9' and 10' of the main body 9 and the lid 10 are formed, and the heat of the parison 3 in the molten state (10
The fiber sheet 7 is closely laminated on the surface of the parison 3 due to its adhesiveness and expansion pressure (0 to 280°C). Further, the fiber sheets 7 are compressed together with the parison in the compression parts 1c and 2C, and a hinge is formed on the surface of which the fiber sheets 7 are closely laminated. In particular, the pressure applied by the compression parts 1c and 2c of the mold allows the parison 3 in a molten state to fit into the fine gaps, thereby improving the adhesion between the fiber sheet 7 and the parison 3. Then, after cooling and solidifying the molded product, mold 1.2
The main body 9 is made up of a double-walled main body 9, a lid 10, and a hinge 11 connecting these together, as shown in FIG. ．． A plastic container 12 is obtained in which the surfaces of the inner walls 9', 10' of the lid 10 and the hinge 11 are made of the fiber layer 7.

Although the above-mentioned embodiments have been described in detail about the method of manufacturing a plastic container in which the entire surface of the inner wall of the container is made of a fiber layer, the present invention is not limited to the above-mentioned embodiments. (1) The entire surface of the outer wall of the container; (2) A portion of the outer or inner wall of the container or the main body or lid may be made of a fiber layer, or the container of the present invention may be formed by arranging the fiber sheet at a desired position. can get.

In addition, when manufacturing a container, a latch consisting of a fitting protrusion and a fitting recess is integrally installed on the mating surfaces of the main body and the lid, and the inner or outer walls of the main body and the lid are shaped to correspond to the stored items. The formation can be performed arbitrarily by known means. Alternatively, the inner wall or outer wall of the main body and the lid may be partially cut and opened by secondary processing, so that the main body and the lid have a single-wall structure. In addition, means for applying adhesion to one or both of the parison or the fibrous sheet, such as an adhesive, may be used to increase the lamination strength of the fibrous layer.

The plastics used in the present invention include polyethylene (low density, medium density, high density), polypropylene, ethylene-
Vinyl acetate copolymer, vinyl chloride, ABS, nylon,
Fiber sheets are soft, hard, and elastic thermoplastics such as polyester, and fiber sheets include natural fibers such as cotton, hemp, wool, and silk, recycled fibers such as viscose rayon, copper ammonia rayon, and semi-synthetic fibers such as acetate and rayon. , nylon, polyester, acrylic, vinylon, polypropylene, polyurethane, and other synthetic fibers, as well as woven, knitted, and nonwoven fabrics obtained by processing these fibers. In particular, in order to obtain a container with a complex shape and good appearance and feel, it is desirable to use a highly stretchable knitted fabric containing 20% or more of thermoplastic synthetic fibers.

〔Effect of the invention〕

As described above, in the manufacturing method of the present invention, it is possible to efficiently obtain a plastic container consisting of a double-walled main body with excellent surface appearance characteristics, a lid body, and a hinge connecting these parts, and whose surface is made of a fiber layer. be able to. In addition, the container obtained by the manufacturing method of the present invention has an excellent appearance, texture, and feel because its desired surface is composed of a fibrous layer.
In particular, when the surface of the outer wall of the container is made of a fibrous layer, the decorativeness of the container is improved, and when the surface of the inner wall of the container is made of a fibrous layer, the protective properties of stored items are improved, and the commercial value of the container is improved. Furthermore, since a fiber layer is inserted into the surface of the hinge that connects the main body and the lid, the repeated bending characteristics (hinge life) are improved.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional view showing an embodiment of the present invention, FIG. 2 is a partially cutaway perspective view of a container obtained by the present invention, and FIG. 3 is an enlarged sectional view of a hinge portion. 1. 2: Mold 3: Neulison 7: Fiber sheet 9: Main body 10: M body 11: Hinge

Claims (1)

[Claims] The parison is extruded between opposingly spaced molds, the fiber sheet is closed between the mold and the parison, and then the two opposing walls of the parison and the fiber sheet are held together in the compression section of the mold cavity. The fiber sheets are laminated using the heat and adhesiveness of the compressed and molten parison, and the molten parison is inserted into small gaps between the fiber sheets by the pressure applied at the compressed part to form a thin hinge. Pressurized fluid is blown into the parison to expand the parison and form it into the external shape of the main body and lid in the cavity.Fiber sheets are laminated on the surfaces of the main body and lid by the heat, adhesiveness and expansion pressure of the parison. A plastic container characterized by: