JPS5918205B2 - Composite sheet manufacturing method for molding - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a method for manufacturing a moldable composite sheet, which is formed by laminating a thermoplastic resin sheet to a moldable sheet-like material. Relating to a method for producing a moldable composite sheet by stretching a sheet material to more than twice its original size, restoring it to its original size without electrodeposition flocking, and then laminating thermoplastic resin sheets together. It is something.

Conventionally, various materials have been used as materials for the inner soles of gift boxes for lighters, microphones, jewelry, watches, and the like. First, items made by pasting fabrics such as velpet or velveteen onto the surface of cardboard were made by hand, making them inefficient, leading to inconsistent delivery times and quality, and lacking a sense of luxury. . In addition, when a thermoplastic resin sheet that has been subjected to electrodeposition flocking is molded by a thermoforming method, the thermoplastic resin sheet is softened and stretched, so the density of the flocking becomes coarse and the appearance is poor. Fabrics such as velveteen or velpet are laminated to a thermoplastic resin sheet using an appropriate adhesive. ), the fabric may tear or break, making it impossible to obtain a molded product that can be used as the inner sole of a cosmetic case. ″o As described above, it has been impossible to obtain molded products with a high-class appearance using conventional techniques.

The present inventor completed the present invention as a result of intensive research in order to obtain a molded product with a beautiful surface appearance that could not be obtained using conventional techniques. The present invention is made of a material that does not soften at the softening point of a thermoplastic resin sheet, and can be stretched to more than twice its original size at the same ratio in length and width. In the state
Short fibers that do not soften at the softening temperature of the thermoplastic resin sheet are flocked on one side of the material 20, and after the elongation is eliminated and the original dimensions are restored, a thermoplastic resin sheet is laminated on the back side. The present invention provides a composite sheet that can be formed into a running shape.

That is, the laminated sheet of the present invention 25 can be heat-formed at 100 to 180°C to provide molded products of any depth or depth. In the present invention, the sheet-like material that can be stretched to twice or more of its original size when the length and width are the same may be any film-like material, 30-knit woven fabric, etc., and examples thereof include urethane foam, natural rubber, and Subandex.

In the present invention, it is most important to use a sheet-like material that can be stretched to twice or more of its original size at the same ratio in length and width as the base material for flocking. If the base material for flocking is one in which the vertical and horizontal elongation ratios 35 are uneven and the elongation ratio is less than twice the original size, the resulting composite sheet may be molded at the corners. This is because cracking occurs due to insufficient stretching, and since the stretching at these corners during molding is particularly large, the density of flocking at these corners becomes coarse and the quality of the resulting molded product is greatly impaired.

If the length and width can be stretched to 2 times or more of the original size at the same ratio, there is an advantage that the electrodeposited sheet material can be easily molded without tearing during heat molding, and the raised portions on the surface can be stretched by stretching. Accidents such as roughness are also avoided, and the surface texture and appearance of the molded product are significantly improved.
In the present invention, the thermoplastic sheet material to be bonded to the back surface of the flocked sheet material is polyvinyl chloride polyvinyl chloride monoacetic acid copolymer, polycarbonate, polypropylene, polyethylene, ABS resin, polystyrene,
Various resins such as cellulose resin and methacrylic resin are used, and the type thereof may be selected depending on the use and purpose.

It may also contain appropriate fillers, lubricants, stabilizers, plasticizers, colorants, flame retardants, antistatic agents, etc.Also, it may have the same vertical and horizontal proportions as the thermoplastic resin sheet and is twice the original size. There is no particular limitation on the method of bonding the sheet-like material that stretches as described above, and it may be crimped using various ordinary adhesives and solvents.

In addition, the thickness of the thermoplastic resin sheet used in the present invention and the sheet-like material that can be stretched at the same ratio in length and width to more than twice its original size should be selected appropriately by considering the use, purpose, economy, and workability. However, the more preferable range is 0.2 to 3 mm for a thermoplastic resin sheet, and 0.4 to 5.0 mm for a sheet-like product that is stretched at the same ratio in length and width to more than twice its original size.

The thermoforming method is generally used to form the composite sheet obtained by the present invention because of its advantages such as good productivity, the ability to provide a decorative and protective finish with an excellent surface appearance, and low equipment costs. used.

Examples of this heat forming method include vacuum or pressure forming, draw forming, etc. Specifically, examples include straight forming, drape forming, plug assist forming, plug assist reverse draw forming, air strip forming, snapback forming, and air action non forming. Examples include free molding, mated molding, plug ring molding, and stub molding.

There is also a drawing method in which a mold is pressed onto a heated sheet to form the product without using air pressure, and when applying this method, it is preferable that the forming temperature is 100 to 180°C and the drawing ratio is 0.7 or less. If the molding temperature is below 100°C, the softening will be insufficient and the sheet will not stretch to the specified dimensions, and if it is above 180°C, the sheet-like material, which stretches to more than twice its original size at the same ratio in length and width, will discolor or deteriorate, which is undesirable. Further, the drawing ratio is H/W (H: depth of the molded article, W: diameter or short side length of the molded article), and it was obtained according to the present invention that the drawing ratio was greater than 0.7. Even with composite sheets, the electrodeposited flocking surface may become rough or damaged at the corners of the molded product. As mentioned above, the molded product using the composite sheet obtained by the present invention has characteristics that could not be obtained using conventional techniques, such as an elegant surface appearance and a good texture and feel. , lighters, watches, jewelry, etc., at the bottom of a cosmetic box (commonly known as a guess board)
Particularly excellent molded products can be obtained.

Example 1 A foamed urethane sheet of 200 tL in length and width was stretched to 40 cm each using a test tenter, one side of the sheet was knife-coated with an acrylic emulsion with a solid content of 35%, and dark blue rayon pulverized short fibers were electrostatically flocked. .

After drying, remove it from the test tenter, restore its original length, and insert a hard PVC board with a thickness of 1 mm and a vinyl roll +
2006 (manufactured by Koubunshi Kagaku) and dried. This composite material was used to make the inner bottom of a decorative lighter case (commonly known as a guess board) using a drawing machine, but it was torn and a product with a high-class appearance was obtained, with no flocking spots. Example 2 A commercially available spandex cloth was stretched 2.2 times vertically and horizontally in the same manner as in Example 1, red acetate cut staple fibers were planted using the vibrating flocking method, and after drying, the tension was restored and an ABS resin board was made. The inner sole of the watch was made by laminating with urethane adhesive and vacuum forming, resulting in a product with an elegant surface and a pleasant feel.

Claims (1)

[Claims] 1. A sheet-like object that is made of a material that does not soften at the softening point of a thermoplastic resin sheet, and that can be stretched at the same ratio both vertically and horizontally, and at least twice its original size. In the stretched state, short fibers that do not soften at the softening temperature of the thermoplastic resin sheet were flocked on one side, and after the stretching was resolved and the original dimensions returned, a thermoplastic resin sheet was bonded to the back side. A method for manufacturing a composite sheet for molding processing, characterized by: