JP2005047155A - Injection-molded painted molding with convex lens and its production method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an injection-molded decorative molding with a convex lens which does not use a lens sheet of a soft material causing the deformation of the convex lens by pressure during injection molding to obtain a desired lens effect and is composed of the transparent injection-molded resin layers of hemispherical convex lens parts and a decorative pattern layer on the opposite surface. <P>SOLUTION: In the method for producing the injection-molded decorative molding with the convex lens, a decorative sheet 10 with the decorative pattern layer 3 formed is set on the side of a mold 21. A transparent molding resin 9 is packed in a molding space formed between the decorative sheet 10 and a mold 20 in which a plurality of hemispherical recesses are formed on one side, and the decorative sheet 10 and a molding resin layer are integrated. In this way, the convex lens part and the decorative pattern layer can easily be formed on one side of the transparent molding resin layer and on the opposite surface, respectively. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention provides an injection molding process with a convex lens in which one surface of a transparent injection molded resin layer is composed of a plurality of hemispherical convex lens portions, and a decorative pattern is formed on the surface opposite to the convex lens portion forming surface of the transparent injection molded resin layer. The present invention relates to a decorative molded product and a manufacturing method thereof.

  Conventionally, as a product exhibiting a lens effect, the invention of a lens sheet disclosed in Patent Document 1 is known. In this lens sheet, a hemispherical convex lens layer is formed on one side of a base sheet, and a decorative pattern layer is formed on the back side thereof by a technique such as printing.

JP-A-9-207254

  However, even if this lens sheet is inserted into an injection mold and integrated with a molding resin, there is a problem that an injection molded product exhibiting a desired lens effect cannot be obtained. The reason is that when the convex lens layer portion is formed of a soft material, the convex lens portion is deformed by the pressure at the time of injection molding. Further, when the convex lens layer portion is formed of a hard material, the lens sheet loses stretchability, and the lens sheet is broken by the pressure during injection molding.

  Accordingly, an object of the present invention is to obtain an injection molded product that exhibits a desired lens effect without using the lens sheet. In order to achieve this object, the inventor has invented the following configuration.

  That is, according to the first aspect of the present invention, one side of the transparent injection-molded resin layer is composed of a plurality of hemispherical convex lens portions, and a decorative pattern layer is formed on the opposite surface of the transparent injection-molded resin layer from the convex lens portion forming surface. It is the injection molded decorative molded product with a convex lens.

  A second aspect of the present invention is an injection-molded decorative article with a convex lens in which the hemispherical convex lens portion has a diameter of 0.05 mm to 3.0 mm.

  Moreover, the 3rd aspect of this invention is an injection-molding painting article with a convex lens whose height of the said hemispherical convex lens part is 0.003 mm-2.0 mm.

  Moreover, the 4th aspect of this invention installs the decoration sheet | seat in which the decoration pattern layer was formed in the B metal mold | die side, and is a decoration sheet | seat and the A metal mold | die with which several hemispherical recessed parts were provided in the surface. Filling the molding space formed between them with a transparent molding resin, and integrating the decorative sheet and the transparent molding resin layer, a hemispherical convex lens part is formed on one side of the transparent molding resin layer. And a decorative pattern layer is formed on the opposite surface of the injection molded decorative molded product with a convex lens.

  Therefore, the injection molded decorative molded product of the present invention has an effect of exhibiting a desired lens effect without using a lens sheet. Moreover, the manufacturing method of the injection molded decorative molded product with a convex lens of the present invention has an effect that the injection molded decorative molded product can be easily obtained.

  In addition, the injection-molded decorative molded product of the present invention has a convex lens part that is part of a transparent molded resin layer, so there is no interface between the base sheet and the convex lens layer part existing in the conventional lens sheet, and peeling at the interface. There is also an effect that the problem of reduction of the lens effect due to the difference of the refractive index of the material and the material does not occur at all. Further, as long as the concave portion can be formed in the A mold, there is also an effect that the lens effect can be applied to the three-dimensional shape portion having a considerably deep aperture.

Hereinafter, the injection molded decorative molded product with a convex lens of the present invention will be described with reference to the drawings.
In the injection molded decorative molded product with a convex lens, a plurality of hemispherical convex lens portions 2 are formed on the surface of a transparent injection molded resin layer 15, and a decorative pattern 3 is formed on the surface opposite to the surface on which the convex lens portions 2 are formed. (See FIG. 1).

  The transparent injection-molded resin layer 15 has a function of protecting the decorative pattern 3, and fulfills a function of promoting a lens effect generated by proper selection of the convex lens portion 2 and the decorative pattern 3.

  The material of the transparent injection molded resin layer 15 is preferably an injection molded resin such as acrylic, polycarbonate, acrylonitrile butadiene styrene, acrylonitrile styrene, polystyrene, polyethylene, polypropylene, polyamide.

  The thickness of the transparent injection molded resin layer 15 is preferably 0.8 mm to 2.5 mm. When the thickness of the injection molded product 15 is less than 0.8 mm, the injection molding itself is difficult and the strength of the injection molded product is weak. On the other hand, when the thickness of the injection molded product 15 exceeds 2.5 mm, molding defects such as sink marks are likely to occur.

  The hemispherical convex lens portion 2 is formed on one side of the injection-molded resin layer 15, and fulfills a function of causing a lens effect by proper selection with the decorative pattern layer 3 formed on the opposite side. The diameter of the hemispherical convex lens portion 2 is preferably 0.05 mm to 3.0 mm. It is technically difficult to produce an injection mold that can form a convex lens portion 2 of less than 0.05 mm. With a convex lens portion 2 of more than 3.0 mm, the lens effect cannot be obtained and the decorative pattern layer has a deep feeling. Because it is difficult to give.

  The height of the hemispherical convex lens portion 2 is preferably 0.003 mm to 2.0 mm. It is technically difficult to manufacture an injection mold that can form a convex lens portion 2 of less than 0.003 mm. With a convex lens portion 2 of more than 2.0 mm, the lens effect cannot be obtained and the decorative pattern layer has a sense of depth. Because it is difficult to give.

  The gap between adjacent hemispherical convex lens portions 2 is preferably 0.005 mm to 3.0 mm. If the gap is less than 0.005 mm, the strength of the gap between adjacent recesses of the corresponding A mold may be insufficient and the A mold may be damaged. If the gap exceeds 3.0 mm, the lens effect is obtained. This is because it is difficult to give the decorative pattern layer a deep feeling.

  In the method of forming the hemispherical convex lens portion 2, a plurality of hemispherical concave portions 22 corresponding to the mold of the convex lens portion 2 are provided on the surface of the A mold 20 of the injection mold, and the molding space portion 8 is transparent. This is a method of filling the injection molding resin and forming the convex lens portion 2 on one side of the transparent injection molding resin layer 15.

  Examples of the method for forming the recess 22 include a method in which the surface of the A mold 20 of the injection mold is formed by etching or engraving, but is not particularly limited. Alternatively, there is a method in which a steel plate or the like in which the concave portion 22 is formed is separately prepared and attached to the surface of the A mold 20. If the molded resin layer 15 is difficult to release from the recess 22, a release film may be placed on the A mold 20 side, or the surface of the recess 22 may be release-coated.

  The decorative pattern layer 3 is formed by a general-purpose printing technique or the like on a pattern desired to be decorated such as a wood grain pattern, a stone pattern, a cloth pattern, a character, a geometric pattern, and a solid surface. A plurality of decorative pattern layers 3 may be formed in parallel.

  Further, the decorative pattern layer 3 may be provided with a metal film layer such as aluminum, chromium, copper, nickel, indium, tin, or silicon oxide by a method such as vacuum deposition or plating. In this case, the metal film layer may be entirely or patterned.

  Examples of the material of the decorative pattern layer 3 include polyester resins, acrylic resins, vinyl resins, nitrified cotton resins, urethane resins, and chlorinated rubber resins, but are not particularly limited.

  The thickness of the decorative pattern layer 3 is preferably 0.5 μm to 50 μm. When the film thickness is less than 0.5 μm, there is a problem that sufficient designability cannot be obtained, and when it is more than 50 μm, there is a problem that it is difficult to dry after printing. However, in the case of a metal film layer, 50 to 1200 mm is preferable. This is because when the film thickness is less than 50 mm, there is a problem that sufficient designability cannot be obtained, and when it is more than 1200 mm, there is a problem that cracks are likely to occur.

  As a method of forming the decorative pattern layer 3, the decorative sheet 10 is placed on a B mold 21 of an injection mold, and a molding resin is formed in the molding space 8 formed by the decorative sheet 10 and the A mold 20. There is a method in which the decorative sheet 10 and the molded resin layer 9 are integrally bonded simultaneously with injection molding by filling 9 and solidifying (see FIG. 2).

  The decorative sheet 10 is obtained by forming the decorative pattern layer 3 on the base sheet 1, and is adhered to the surface opposite to the surface on which the convex lens portion 2 is formed of the transparent injection-molded resin layer 15. It fulfills the function of forming (see FIG. 3).

  The material of the base sheet 1 is preferably a polyester resin, a vinyl chloride resin, an acrylic resin, a polycarbonate resin, a polypropylene resin, a polyethylene resin, a polyurethane resin, a polystyrene resin, an acetate resin, a polyamide resin, or the like. .

  The film thickness of the base sheet 1 is preferably 5 μm to 5 mm. This is because if the film thickness is less than 5 μm, the sheet is not rigid and the convex layer 2 cannot be supported, and if it is thicker than 5 mm, the sheet is too rigid and difficult to handle.

  The formation method of the base sheet 1 may be a general film forming method such as extrusion molding, calendar molding, or casting. In addition, the base sheet 1 may be subjected to easy adhesion treatment such as corona discharge treatment, plasma treatment, and easy adhesion primer coating on the surface on the side on which the printed layer is formed, if necessary.

  As shown in FIG. 4, as a transfer sheet for forming the release layer 5 on the base sheet 1 and integrating the decorative sheet 10 with the transparent injection molding resin layer 15, the base sheet 1 is peeled and removed. Also good.

  The release layer 5 is made of acrylic resin, vinyl chloride resin, polyurethane resin, polyester resin, polypropylene resin, polyethylene resin, polystyrene resin, polycarbonate resin, vinylon resin, acetate resin, polyamide. A preferred material is appropriately selected according to the releasability with each layer.

  The thickness of the release layer 5 is preferably 0.5 μm to 50 μm. If the film thickness is less than 0.5 μm, there is a problem that sufficient peelability cannot be obtained, and if it is more than 50 μm, there is a problem that it is difficult to dry after printing.

  The method for forming the release layer 5 may be a method such as gravure printing, offset printing, or screen printing, or a method such as painting, dipping, or reverse coater.

  Further, an adhesive layer 6 may be provided on the decorative pattern layer 3 in order to firmly bond the decorative pattern layer 3 to the transparent injection molding resin layer 15.

  The material of the adhesive layer 6 is acrylic resin, vinyl chloride resin, polyurethane resin, polyester resin, polypropylene resin, polyethylene resin, polystyrene resin, polycarbonate resin, vinylon resin, acetate resin, polyamide. A resin may be used, and a preferable material is appropriately selected according to the adhesiveness with each layer.

  The film thickness of the adhesive layer 6 is preferably 0.5 μm to 10 μm. If the film thickness is less than 0.5 μm, there is a problem that sufficient adhesion cannot be obtained, and if it is more than 10 μm, there is a problem that it is difficult to dry after printing.

  The method for forming the adhesive layer 6 may be a method such as gravure printing, offset printing, or screen printing, or a method such as painting, dipping, or reverse coater.

  Moreover, when the peeling layer 5 or the adhesive layer 6 and the decorative pattern layer 3 have poor adhesion, an anchor layer may be provided as necessary.

  The material of the anchor layer is acrylic resin, vinyl chloride resin, polyurethane resin, polyester resin, polypropylene resin, polyethylene resin, polystyrene resin, polycarbonate resin, vinylon resin, acetate resin, polyamide resin A preferable material is appropriately selected according to the adhesion to each layer.

  The thickness of the anchor layer is preferably 0.5 μm to 50 μm. If the film thickness is less than 0.5 μm, there is a problem that sufficient adhesion cannot be obtained, and if it is more than 50 μm, there is a problem that it is difficult to dry after printing.

  The formation method of the anchor layer may be a method such as gravure printing, offset printing, or screen printing, or a method such as painting, dipping, or reverse coater.

  A semispherical concave portion having a depth of 0.04 mm and a diameter of 0.3 mm was formed on the surface of the A mold of the injection molding die on the top, bottom, left and right surfaces with a gap of 0.05 mm between adjacent concave portions.

  Next, using a 38 μm polyethylene terephthalate film as a base sheet, a 1 μm release layer made of an acrylic resin is formed, and then a 2 μm decorative pattern layer made of a urethane resin and adjacent to a 2 μm decorative pattern layer made up of the letter N Formed with a pattern gap of 0.08 mm, an adhesive layer made of vinyl chloride resin was then formed, and a transfer sheet was obtained.

  The transfer sheet obtained in this way is set on the surface of the B mold of the injection mold, and the molding space formed between the mold and the A mold is filled with polycarbonate molding resin and integrated with the decorative sheet. After removing the base sheet, a convex lens portion is formed on a part of the surface of the transparent molded resin layer, and when viewed through the letter N, the lens-shaped injection with an excellent design is achieved. A molded decorative molded product was obtained.

  A semispherical concave portion having a depth of 0.06 mm and a diameter of 0.5 mm was formed on the surface of the A mold of the injection molding die on the top, bottom, left and right surfaces with a gap of 0.3 mm between adjacent concave portions.

  Next, a 125 μm polycarbonate film is used as a base sheet, and a 2 μm decorative pattern layer made of acrylic resin is formed on the top, bottom, left, and right surfaces with a gap of 0.2 mm between adjacent patterns, and then a vinyl chloride resin The adhesive layer which consists of was formed one by one, and the decorating sheet was obtained.

  The decorative sheet thus obtained is set on the B mold surface of the injection mold, and the molding space formed between the mold and the A mold is filled with polycarbonate molding resin, When integrated, a convex lens part is formed on a part of the surface of the transparent molded resin layer, and when viewed through it, an injection molded decorative molded product with a convex lens with an excellent design property in which the letter N shows a lens effect is obtained. It was.

It is sectional drawing which shows one Example of the injection molded decorative molded product with a convex lens which concerns on this invention. It is sectional drawing which shows one concept of the manufacturing method of the injection molded decorative molded product with a convex lens concerning this invention. It is sectional drawing which shows one Example of the decorating sheet which concerns on this invention. It is sectional drawing which shows one Example of the decorating sheet which concerns on this invention.

Explanation of symbols

1 Base sheet
2 Convex lens
3 decoration pattern layers
5 Release layer
6 Adhesive layer
8 Molding space
9 Molding resin 10 Decorative sheet 15 Injection molded resin layer 20 A mold 21 B mold

Claims (4)

An injection-molded decorative molded product with a convex lens in which one side of a transparent injection-molded resin layer is composed of a plurality of hemispherical convex lens portions, and a decorative pattern layer is formed on the surface opposite to the convex lens-portion-forming surface of the transparent injection-molded resin layer . The injection molded decorative molded product with a convex lens according to claim 1, wherein the hemispherical convex lens portion has a diameter of 0.05 mm to 3.0 mm. The injection molded decorative molded product with a convex lens according to claim 1, wherein the height of the hemispherical convex lens portion is 0.003 mm to 2.0 mm. A decorative sheet on which a decorative pattern layer is formed is placed on the B mold side, and is transparent in the molding space formed between the decorative sheet and the A mold having a plurality of hemispherical recesses on the surface. By filling the molding resin and integrating the decorative sheet and the transparent molding resin layer, a hemispherical convex lens part is formed on one side of the transparent molding resin layer, and a decorative pattern layer is formed on the opposite side. The manufacturing method of the injection-molding decoration molded product with a convex lens in any one of Claims 1-3 characterized by the above-mentioned.

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