JPS5871129A - Blow molding method - Google Patents

Abstract

PURPOSE:To obtain a resin product having excellent cushioning properties and beautiful appearance, by a method wherein a skin material is set on the inner wall surface of each of molds, and a foamed body is set on a predetermined portion of the inner surface of each skin material, and then a parison is extruded into the molds, and the molds are closed, and while the parison is expanded, the parison is heat-welded to the foamed body and the skin materials. CONSTITUTION:Skin materials 3 and 4 are set on the inner wall surfaces of molds 1 and 2, respectively. Moreover, resin foams 5 and 6 are set on predetermined portions of the inner surfaces of the skin materials 3 and 4, respectively. With the molds 1 and 2 open, a resin parison 8 is extruded into the molds from an extruder head 7, and the molds 1 and 2 are closed. While air is blown into the parison 8 from a blow pin 10 to expand the parison 8, the greater part of the parison 8 is brought into close contact with the inner surfaces of the foams 5 and 6 and heat-welded thereto. In addition, a part of the parison 8 is brought into close contact with a part of each of the skin materials 3 and 4 and heat- welded thereto. Thereby, it is possible to easily obtain a resin product.

Description

Detailed Description of the Invention The present invention relates to a blow molding method for resin products. Specifically, the rigidity and flexibility are provided by the inner resin, the cushioning properties are provided by the foam, and the feel is provided by the outer skin material. The present invention relates to a blow molding method for resin products.

There are many interior chairs and beds on the market that have urethane foam fixed with adhesive to frame parts made of metal, plastic, wood, etc., and covered with patterned blankets. However, since the work is done manually,
It is expensive and difficult to reduce costs.

The object of the present invention is to produce resin products with excellent cushioning properties and aesthetic appearance by blow molding without going through a sewing process. Therefore, in the blow molding method of the present invention, a stretchable resin skin material is set on the inner wall surface of the mold,
Further, a resin foam is set on a predetermined part of the inner surface of the skin, and then the parison is extruded into a mold, the mold is closed, and air is blown into the parison to inflate it. In addition, most of the parison is brought into close contact with one surface of the foam and heat-sealed, and a part of the parison is closely layered and heat-sealed on a part of the inner surface of the skin material. be.

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows a first embodiment of the invention (7), and FIG. 2 shows a second embodiment of the invention.

In FIG. 1, 1 and 2 are gold JlllL, 3 and 4 are epidermis, 5 and 6 are foam, 7 is an 11° press head, 8 is a parison, a 90° pre-pinch device, and an IJj blowbin.

The epidermis 6 and 4 are both mainly made of a resin fabric that has elasticity and are made of a resin fabric that has elasticity. 0, polyolenoin-based tree) is made of a solid rolled or foamed laminate and lined with a +A resin. In this case, the lining may be omitted.

1k, foams 5 and 6 are both made of polyurethane foam, etc.
Depending on the desired cushioning properties, the hard i hole may be soft or a combination of 11II first and soft q'↓ may be used.

Valinone 8 is preferably a polyolefin resin or high-density polyethylene.

Furthermore, to explain based on FIG. 1, skin materials 3 and 4 made of the above-mentioned materials are attached to the inner wall surfaces of the molds 1 and 2, and resin foams 5 and 6 made of the materials mentioned above are attached to the inner walls of the molds 1 and 2. is attached to a predetermined portion of the inner surface of the skin material slot 4. Then, with the molds 1 and 2 open, the above-mentioned material, for example, Balinon 8, which is a polyolefin resin, is extruded into the mold from the extruder head 7 in a single position, and the parison 8 is formed by the pre-pinch device 9. Pinch the tip. In this state, molds 1 and 2 are closed, and air is blown into the parison 8 from the blow pin 10 to inflate the parison 8 while bringing the dog part of the parison 80 into close contact with the inward direction of the foams 5 and 6 to heat-melt. At the same time, a part of the parison 8 is brought into close contact with a part of the skin materials 5 and 4 and heat-sealed. After cooling for an appropriate amount of time, the mold is opened and the product inside is taken out. When the inside is made of polyolefin resin and the middle is polyurethane foam (c
A molded product can be obtained with a cushion made of Niboolefin foam (4) and a resin seam (1) with elasticity on the outside, which has only one fiber link.

FIG. 2 shows the application 1+11 to a chair, and in the same figure, the blow molding order is 71, zu from 1- to [-. 1), Figure 2 (-) shows molds 1 and 2 as described above. The shape of the urethane foam-soil or polyoleno foam 5 and 6 may be the side surface 1 shown by the two-dot chain line. (There must be a part left in contact with parison 8).The diagram in Figure 2 shows that when molds 1 and 2 are closed, polyolefin resin parison 8 is inflated by internal air pressure, and urethane foam or polyolefin is formed. The urethane foam'!l:
*Polyolefin foams 5 and 6 are compressed by internal air pressure. Figure 1 in Figure 2 shows the blow-molded products taken out from the molds 1 and 2 after cooling in the state shown in the middle diagram. The heat fusion allowance has been subtracted and the original thickness has been restored.

In addition, in the example described in Ajl, the possibility of using urethane foam or polyolefin foam as the material was explained, but the resin foam described in m1 that is thermally fused with the material and has cushioning properties. If so, it can be implemented in the same way.

Therefore, according to the present invention, synthetic resin products that were conventionally manufactured by handmade cottage industries, etc., are made of synthetic resin or other resin on the inside, cushioning material in the middle, and elastic resin outer skin on the outside. Resin products such as synthetic resin products can be manufactured easily and accurately by blow molding, and mass production is possible, so they can be provided at low cost.

[Brief explanation of drawings]

FIG. 1 shows the first embodiment of the present invention;
/=i<111 sectional view. 1.2...mold, 6,4...epidermis, 5゜6...
7...Extruder-\Grot, 8...Parison, 9...Pre-pinch device, 10...Blowbin. Special, -i'l- requester Ishikawajima Ban 1 Tochu T! 51 Akari Company Agent Patent Attorney 1st grade I11 Tomihisa (7) Brown 1st second flash 185-

Claims (1)

[Claims] 1. A stretchable resin skin material is set on the inner wall surface of the mold, a resin foam is further set on a predetermined portion of the inner surface of the skin material, and the parison is slowly extruded into the mold, and then the The mold is closed, and then air is blown into the parison to inflate the parison, bringing most of the halinon into close contact with one surface of the foam and heat-sealing it, and part of the parison is attached to the skin material. A blow molding method that is characterized by heat-sealing the product in close contact with a part of the inner surface of the product.