JP4877030B2 - Manufacturing method of plastic moldings for industrial materials - Google Patents

Description

  INDUSTRIAL APPLICABILITY The present invention is used as a small liquid crystal display panel member (with all diagonal dimensions of the display unit being less than 2.5 inches) such as a mobile phone, an advanced information release terminal, a digital camera, a liquid crystal television, electronic paper, and an electronic dictionary. The present invention relates to a plastic molded product for industrial materials and a manufacturing method thereof.

  Conventionally, as a method of decorating the surface of a plastic molded product, there are a primary decoration performed simultaneously with molding and a secondary decoration performed after molding, and the primary decoration includes a film insert molding method, in-mold transfer The method etc. were used, and the silk screen printing method, coating, etc. were used as secondary decoration.

As a primary decorative film insert molding method, for example, the decorative film is inserted into a mold for injection molding having fine irregularities on the cavity surface, and then the decorative film is inserted in advance and then melted into the mold cavity. A resin is injected to mold a plastic molded product, and at the same time, a decorative film is fused to the surface of the plastic molded product (see Patent Document 1), or a thermoplastic resin film composed of a colored layer and an outer clear layer, Inserted into the mold for injection molding in advance, then injected the molten resin into the mold cavity to mold the plastic molded product, and at the same time fused the thermoplastic resin film to the surface of the plastic molded product ( In addition, as an in-mold transfer method, for example, an in-mold transfer film is introduced into a mold and a plastic is used. Simultaneously molding the molded article, obtained by fusing transferred pattern of the in-mold transfer film on the surface of the plastic molded article (see Patent Document 3) had the like.
JP 2000-158479 A JP 2000-317976 A JP 10-1113949 A

  As described above, there have been many inventions and devices for the film insert molding method, however, no inventions and devices related to industrial materials have been found. As for the in-mold transfer method, for example, FIG. 2 (a) shows an in-mold transfer configuration of an example base film layer 41 / peeling varnish layer 42 / metal vapor deposition layer 43 / ink layer 44 / adhesive layer 45. The film 40 is shown. Using this in-mold transfer film 40, the release varnish layer 42 / metal vapor deposition layer 43 / ink layer 44 / adhesive layer 45 / molded product body 31 of FIG. The structure of the insert transfer plastic molded product 30 is manufactured. Since the release varnish layer is basically required during the configuration of the in-mold transfer film, the surface properties of the insert transfer plastic molded product include friction. Naturally, there were limits to the scratch resistance and thermal shock resistance, and gloss and transparency were also limited for the same reason.

  The present invention solves the above-mentioned conventional problems, and has a sufficient surface property as a member of industrial materials, has good gloss and transparency, and has good productivity. A molded article and a manufacturing method thereof are provided.

That is, in the present invention, after applying a varnish to the metal deposition layer surface of the transparent resin base film layer having a hard coating layer on one side and a metal deposition layer on the other side, and providing a non-metal deposition part by pasta processing, On the metal deposition layer side, an ink layer and an adhesive layer are sequentially provided to produce an insert film.
A transparent resin base film layer provided with a hard coat layer on one side and a metal vapor deposition layer on the other side, before providing an ink layer and an adhesive layer on the metal vapor deposition layer side, above the glass transition temperature of the transparent resin base film layer, Heat aging at a temperature below the melting point,
After the insert film is cut into a predetermined shape and previously inserted into an injection mold, the molten resin is injected into the mold to form a plastic molded article body, and at the same time, the surface of the plastic molded article body in a industrial materials for the production method for a plastic molded article characterized in that it is welded to the insert film.

  Since the plastic molding for industrial materials of the present invention has a hard coat layer formed on the outer surface, it has sufficient surface properties as a member of industrial materials due to the characteristics of this hard coat layer.

  The structure of the plastic molded product for industrial materials of the present invention is <outer surface side> hard coat layer / transparent resin base film layer / metal vapor deposition layer / ink layer / adhesive layer / plastic molded product body <inner surface side>. Therefore, gloss and transparency become good.

  In addition, the plastic molded product for industrial materials of the present invention has a transparent resin base film layer provided with a hard coat layer on one side and a metal vapor deposition layer on the other side, before providing an ink layer and an adhesive layer on the metal vapor deposition layer side, Since it is heated and aged at a temperature not lower than the glass transition temperature and not higher than the melting point of the transparent resin base film layer, it can withstand a 20-cycle thermal shock test of −20 ° C. × 1 hour and + 85 ° C. × 1 hour.

  In addition, the plastic molded product for industrial materials of the present invention is manufactured by a film insert molding method, and compared with the in-mold transfer method, the defective rate at the time of manufacturing is small and the delivery time required for manufacturing can be shortened. As a result, productivity is good.

  Next, embodiments of the plastic molded product for industrial materials of the present invention will be described in detail with reference to the drawings.

  Fig.1 (a) is sectional drawing of the film for inserts concerning this embodiment, FIG.2 (b) is sectional drawing of the plastic molded product for industrial materials of this embodiment using the film for inserts. .

  First, the film for inserts according to the present embodiment has a polyethylene terephthalate film or polycarbonate film having a thickness of about 75 μm to 125 μm as a transparent resin base film layer, and a hard coat layer such as an ultraviolet curing type is provided on one side of the transparent resin base film layer. Form a metal vapor deposition layer on the other side, and if necessary, suppress the metal vapor deposition layer surface, print the varnish by silk screen printing method, apply paster processing, and make the metal vapor deposition layer a window frame or one point In accordance with the design, etc., after forming the non-metal vapor deposited portion, the pattern and the adhesive are sequentially printed on the metal vapor deposited layer surface by the silk screen printing method, and the hard coat layer 21 / transparent resin base shown in FIG. The insert film 20 having the structure of the film layer 22 / metal vapor deposition layer 23 / ink layer 24 / adhesive layer 25 It is to be produced.

  In the above-mentioned process for producing an insert film, a transparent resin base film layer provided with a hard coat layer on one side and a metal vapor deposition layer on the other side, and a transparent resin base before providing an ink layer and an adhesive layer on the metal vapor deposition layer side. Heat aging is performed at a temperature not lower than the glass transition temperature and not higher than the melting point of the film layer. This heat aging is intended to withstand a 20 cycle thermal shock test of −20 ° C. × 1 hour and + 85 ° C. × 1 hour. For example, when a polyethylene terephthalate film is used as a transparent resin base film layer, Heat aging is performed at a temperature of about 110 ° C. to 120 ° C. as a standard and at a temperature equal to or higher than the glass transition temperature for about 1 hour as a minimum standard.

  Next, the above-described insert film 20 is cut into a predetermined shape, and the cut insert film is inserted in advance into an injection mold, and then molten resin such as polycarbonate or polymethyl methacrylate is made of gold. At the same time as forming a plastic molded product body by injection into the mold, an insert film is welded to the surface of the plastic molded product body, and the hard coat layer 21 / transparent resin base film layer 22 shown in FIG. A plastic molded product 10 for industrial materials having a structure of / metal deposition layer 23 / ink layer 24 / adhesive layer 25 / molded product body 11 is produced.

  When the resin of the molded body is polycarbonate, the insert film is controlled by controlling the mold temperature with an oil temperature between 95 ° C. and 105 ° C. and setting the nozzle temperature to a high temperature of about 270 ° C. to 330 ° C. Is well welded to the molded product body. Further, when the resin of the molded product body is polymethyl methacrylate or ABS resin, the mold temperature is set lower by about 30 ° C. to about 50 ° C. than that of polycarbonate.

  In addition, the plastic molded product for industrial materials of this embodiment is a polyethylene terephthalate film hard coat specification polycarbonate molded product, the pencil hardness test of JIS standard K5400 is 3H level, and is a polycarbonate film hard coat specification polycarbonate molded product. The pencil hardness test of JIS standard K5400 is 2H level and conforms to the world standard of mobile phone panels.

(A) is sectional drawing which shows the structure of the film for inserts concerning this invention, (b) is sectional drawing which shows the structure of the plastic molded product for industrial materials of this invention using the film for inserts. . (A) is sectional drawing which shows the structure of the conventional film for insert transfer, (b) is sectional drawing which shows the structure of the insert transfer plastic molded product of this invention using the film for insert transfer.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Plastic molded article 11,31 ... Industrial product body 20 ... Insert film 21 ... Hard coat layer 22 ... Transparent resin base film layer 23,43 ... Metal vapor deposition layer 24,44 ... Ink layer 25, 45 ... Adhesive layer 30 ... Insert transfer plastic molding 40 ... Insert transfer film 41 ... Base film layer 42 ... Release varnish layer

Claims (1)

After applying a varnish to the metal deposition layer surface of the transparent resin base film layer having a hard coating layer on one side and a metal deposition layer on the other side and providing a non-metal deposition part by pasta processing, on the metal deposition layer side, Sequentially, an ink layer and an adhesive layer are provided to produce an insert film,
A transparent resin base film layer provided with a hard coat layer on one side and a metal vapor deposition layer on the other side, before providing an ink layer and an adhesive layer on the metal vapor deposition layer side, above the glass transition temperature of the transparent resin base film layer, Heat aging at a temperature below the melting point,
After the insert film is cut into a predetermined shape and previously inserted into an injection mold, the molten resin is injected into the mold to form a plastic molded article body, and at the same time, the surface of the plastic molded article body in, wherein the industrial production method of materials for plastic moldings you that you have welded the insert film.

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