JP4404598B2 - Manufacturing method for simultaneously molded decorative molded products - Google Patents

Description

  In the simultaneous molding decoration method, a decorative sheet provided with a decorative layer is disposed on a base sheet between an A mold and a B mold of an injection mold, and a mold of an A mold and a B mold. In this method, a molding resin is injected into a molding space formed by closing to form an injection-molded product, and at the same time, a decorative layer is integrally bonded to the surface of the injection-molded product.

  And recently, due to the need for improved design properties and improved physical properties of the surface of the molded resin, the simultaneous molding and double-sided decoration method in which a decorative layer is provided on both sides as well as on one side of the molded resin layer as in Patent Document 1 has been highlighted. Have been bathed. In the case of such a molding simultaneous double-sided decoration method, the first decorative sheet and the second decorative sheet are placed in both the A mold and the B mold, and the molding resin is injected. Is common.

JP-A-6-99457

  However, when forming a decorative layer on both surfaces of the molded resin layer, when the mold is opened, the resulting molded simultaneous decorative molded product is held on the side of the A mold, held on the side of the B mold, Alternatively, it may not be held in either direction and may be dropped from the injection mold at the same time as opening the mold, making it difficult to collect the double-sided decorative molded product continuously and stably during mass production. There was a problem.

  Therefore, the present inventor has made the following invention in order to solve the above problems.

1st invention arrange | positions the 1st decorating sheet in A mold | die of the injection mold in which the ejector pin is attached, and after arrange | positioning the 2nd decorating sheet in B mold | die of an injection mold, A molding space is formed by closing the A mold and the B mold, and a molding resin is injected into the molding space to form an injection molded product, and at the same time, a first decorative sheet and a second decorative sheet Is a method for producing a molded simultaneous decorative molded product, wherein the size of the second decorative sheet is set so as to cover almost the entire cavity surface of the B mold, The mold release weight from the B mold is set to be smaller than the mold release weight of the first decorative sheet from the A mold, and the molded simultaneous decorative molded product is held in the A mold after the mold is opened. It is what I did.

According to a second aspect of the present invention, in the configuration of the first aspect, the B mold further includes a second ejector pin that operates simultaneously with the mold opening.

  Therefore, according to the method for producing a simultaneously molded decorative molded product of the present invention, the molded simultaneous decorated molded product obtained is constantly held on the side of the A mold and is ejected by an ejector pin attached to the side of the A mold. Since the simultaneous molding decorative molded product can be ejected, the recovery device can always operate in the same direction, so it is possible to recover the simultaneous molding on both sides continuously and stably during mass production. There is an effect that can be done.

  Further, according to the first decorative sheet, the second decorative sheet, and the injection mold according to the present invention, it is possible to simultaneously decorate the molding without making it easy to hold the shape of the injection molded product on the side of the A mold. Since the molded product can be held on the side of the mold A, there is an effect that the selection range of the shape of the molded simultaneous decorative molded product is expanded.

  Hereinafter, the invention of the method for producing a molded simultaneous decorative molded product of the first aspect of the present invention will be described with reference to the drawings. The manufacturing method of the simultaneous decorative decorative molded product 10 of the present invention is as follows. The first decorative sheet 2 is arranged in the A mold 5 and the second decorative sheet 3 is arranged in the B mold 6. And a mold 6 are closed to form a molding space 12, and a molding resin 7 is injected from the gate 8 into the molding space 12 (see FIG. 1). The first decorative sheet 2 and the first decorative sheet 2 are integrally formed on the back surface of the second decorative sheet 3, and is characterized in that the molded simultaneous decorative molded product 10 is held in the A mold 5 after the mold is opened (Fig. 2).

  The A mold 5 is formed in a rectangular shape or the like as in the prior art, and includes a reference surface 13 that directly contacts the B mold 6 at the peripheral end thereof. A concave portion 14 having a shape suitable for the outer shape of the molded product is formed in the inner portion surrounded by the reference surface 13 (see FIG. 7). On the other hand, the B mold 6 is formed in a square shape having a width and a height corresponding to the A mold 5, and includes a reference surface 13 that is a flat surface that directly contacts the A mold 5. A concave portion 14 having a shape suitable for the outer shape of the molded product is formed in the inner portion surrounded by the reference surface 13 (see FIG. 8).

  Then, the first decorative sheet 2 and the second decorative sheet 3 are sandwiched so that the reference surface 13 of the A mold 5 and the reference surface 13 of the B mold 6 are in contact with each other (FIG. 1). In FIG. 8, the recess 14 (see FIG. 8) of the B mold 6 is arranged in the recess 14 (see FIG. 7) of the A mold 5. And the molding space part 12 is formed between the 1st decorating sheet 2 and the 2nd decorating sheet 3, A part of recessed part 14 of the B metal mold | die 6 becomes the gate 8, The molding resin 7 passes through this gate 8 Then, it is injected into the molding space 12 (see FIG. 1). The height, width, and thickness of the molding space 12 correspond to the predetermined height, width, and thickness of the molded product.

  And if the molding resin 7 is inject | poured and solidified in the molding space part 12, the molding resin layer 1, the 1st decorating sheet 2, and the 2nd decorating sheet 3 will adhere | attach and integrate. Thereafter, when the A mold 5 and the B mold 6 are opened, the release weight of the second decorative sheet 3 from the B mold 6 is the release weight of the first decorative sheet 2 from the A mold 5. Since the second decorative sheet 3 is separated from the B mold 6, the second decorative sheet 3 is bonded to the surface of the molded resin layer 1, and the first decorative sheet 2 is bonded and integrated to the back surface. The decorative molded product 10 is held in the A mold 5 (see FIG. 2).

  Thereafter, when the ejector pin 4 attached to the A mold 5 of the injection mold protrudes the simultaneous decorated decorative molded product 10, the simultaneous molded decorative molded product 10 is separated from the A mold 5, and the ejector pin 4. Thus, the molded simultaneous decorative molded product 10 detached from the A mold 5 of the injection mold is taken out from the mold by the recovery device 15 (see FIG. 3). As a recovery method, there are a suction method by suction and a method of catching by pinching. The ejector pin 4 is driven by pressure such as hydraulic pressure.

  Below, the 1st decorating sheet 2 and the 2nd decorating sheet 3 which concern on this invention are demonstrated.

  The first decorative sheet 2 and the second decorative sheet 3 are sheets on which the first decorative layer 20 and the second decorative layer 30 that are not peeled off are formed on the base sheet 21. As an example of the 1st decoration layer 20 and the 2nd decoration layer 30, there exists what laminated | stacked the pattern layer 23 and the contact bonding layer 24 one by one (refer FIG. 5). And the 1st decorating sheet 2 and the 2nd decorating sheet 3 adhere | attach on both surfaces of the molding resin layer 1, and the shaping | molding simultaneous decorating molded article 10 is obtained (refer FIG. 4).

  An anchor layer 26 may be formed between the base sheet 21 and the design layer 23 or between the design layer 23 and the adhesive layer 24 to improve the adhesion. Moreover, when the design layer 23 has adhesiveness, the adhesive layer 24 may be omitted.

  The material of the base sheet 21 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 21 is preferably 5 μm to 5 mm. This is because if the film thickness is less than 5 μm, there is a problem that the sheet is not rigid and easily wrinkled, and if it is thicker than 5 mm, the sheet is too rigid and difficult to handle.

  The base sheet 21 may be formed by 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.

  The pattern layer 23 is a layer on which a pattern to be decorated such as a wood grain pattern, a stone pattern, a cloth pattern, a character, a geometric pattern, a solid pattern and the like is formed. A plurality of design layers 23 may be formed in parallel. Moreover, you may provide a metal film layer in the pattern layer 23 as needed. In this case, the metal film layer may be entirely or patterned.

  Examples of the material for the pattern layer 23 include, but are not particularly limited to, polyester resins, acrylic resins, vinyl resins, nitrified cotton resins, urethane resins, and chlorinated rubber resins. In the case of a metal film layer, aluminum, chromium, copper, nickel, indium, tin, silicon oxide, and the like can be given, but there is no particular limitation. .

  The thickness of the pattern layer 23 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, 150 to 1200 mm is preferable. If the film thickness is less than 150 mm, there is a problem that sufficient designability cannot be obtained, and if it is more than 1200 mm, there is a problem that cracks are likely to occur.

  The pattern layer 23 may be formed by a method such as gravure printing, offset printing, or screen printing, or by a method such as painting, dipping, or reverse coater. In the case of a metal film layer, there are methods such as vacuum deposition and plating.

  The material of the adhesive layer 24 includes acrylic resin, vinyl resin, urethane resin, polyester resin, polypropylene resin, polyethylene resin, polystyrene resin, polycarbonate resin, vinylon resin, acetate resin, polyamide resin. Resin can be mentioned, A preferable material is suitably selected according to adhesiveness with molding resin.

  The film thickness of the adhesive layer 24 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 24 may be a method such as gravure printing, offset printing, or screen printing, or a method such as painting, dipping, or reverse coater.

  The material of the anchor layer 26 is acrylic resin, vinyl resin, urethane resin, polyester resin, polypropylene resin, polyethylene resin, polystyrene resin, polycarbonate resin, vinylon resin, acetate resin, polyamide resin. Resin can be mentioned, A preferable material is suitably selected according to adhesiveness with molding resin.

  The film thickness of the anchor layer 26 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 anchor layer 26 may be formed by a method such as gravure printing, offset printing, or screen printing, or by a method such as painting, dipping, or reverse coater.

  In addition, as for the form of the 1st decorating sheet 2 and the 2nd decorating sheet 3, the sheet-like thing cut into the predetermined dimension is preferable. This is because, when the molded simultaneous decorative molded product 10 is ejected from the A mold 5 and the B mold 6, it is easier to handle when there is no sheet edge.

  Further, the release weight of the second decorative sheet 3 from the B mold 6 and the release weight of the first decorative sheet 2 from the A mold 5 are preferably less than 100 g weight / cm. This is because if the weight is 100 g weight / cm or more, the simultaneous decorative and molded product 10 may be caught by the mold and damaged when the mold is opened.

  And it is preferable to make the mold release weight from A mold 5 of the 1st decorating sheet 2 more than the mold release weight from the B mold 6 of the 2nd decorating sheet 3. This is because if the mold release weight of the second decorative sheet 3 from the B mold 6 is larger, the molded simultaneous decorative molded product 10 may be held in the B mold 6.

  As a means for making the release weight from the A mold 5 of the first decorative sheet 2 equal to or higher than the release weight from the B mold 6 of the second decorative sheet 3 as described above, An overcoat layer 22 is provided on the surface of the sheet 2 so as to be temporarily in close contact with the A mold 5 (see FIG. 5), or a release overcoat layer that is easily released from the B mold 6 on the surface of the second decorative sheet 3. 25 may be provided (see FIG. 6).

  Examples of the material of the overcoat layer 22 include acrylic resins, vinyl resins, urethane resins, polyester resins, polycarbonate resins, vinylon resins, acetate resins, and polyamide resins. A preferred material is appropriately selected depending on the temporary adhesion to the substrate.

  The method of providing the overcoat layer 22 may be a method such as gravure printing, offset printing, or screen printing, or a method such as painting, dipping, or reverse coater. Alternatively, the overcoat layer 22 may be formed into a film in advance and formed by a laminating method.

Examples of the material for the release overcoat layer 25 include silicon-based resins, melamine-based resins, and fluorine-based resins. A preferable material is appropriately selected depending on the releasability with the B mold 6.

  The method for providing the release overcoat layer 25 may be a method such as gravure printing, offset printing, or screen printing, or a method such as painting, dipping, or reverse coater. Alternatively, the overcoat layer 25 may be formed into a film in advance and formed by a laminating method.

  In addition, the method of measuring a mold release weight is after attaching the 1st width | variety 1st decorative sheet 2 and the 2nd decorative sheet 3 to the metal mold | die thin plate 17 of A metal mold | die 5 and B metal mold | die 6, respectively. The end of the mold thin plate 17 is fixed with one chuck 16, and then the base sheet 21 is peeled off by 2 cm, bent at 180 °, fixed with the other chuck 16, and pulled by peeling at an ambient temperature of 25 ° C. This is a method of measuring the strength (see FIG. 9).

  Further, in order for the second decorative sheet 3 to be easily released from the B mold 6, a second ejector pin 9 that operates simultaneously with the mold opening may be attached to the B mold 6 (FIG. 8). reference).

  Although the shape of the 2nd ejector pin 9 is not specifically limited, Since the surface of the 2nd decorating sheet | seat 3 is pressed, in order to prevent damage, it is preferable to provide micro R at the front-end | tip part. If the number of attachment positions is one, the vicinity of the center of the molding space 12 is preferable.

  A release overcoat layer made of silicon resin is formed on one side of a base sheet made of a polyethylene terephthalate film (easy adhesion treatment) with a thickness of 38 μm, and an anchor layer is formed on the opposite side using a urethane resin-based two-component curable ink. It formed by the gravure printing method. After heat treatment at 120 ° C. for 5 minutes, a pattern layer made of an aluminum metal film having a thickness of 600 ± 50 mm is formed by vacuum deposition, and then an adhesive layer made of vinyl chloride vinyl acetate copolymer resin is formed by gravure printing. By forming, the 2nd decorating sheet of mold release weight 3g weight / cm was prepared.

  On the other hand, by patterning a woodgrain pattern layer made of acrylic resin on a base sheet made of polyethylene terephthalate film (easy adhesion treatment) with a thickness of 38 μm, and then forming an adhesive layer made of vinyl chloride resin by gravure printing A first decorative sheet having a release weight of 10 gf / cm was prepared.

  The prepared first decorative sheet is placed in the A mold of the injection mold attached with the ejector pin, and the second decorated sheet is placed in the B mold attached with the second ejector pin, and then acrylonitrile. A molding resin made of butadiene styrene copolymer resin is injected, and after cooling and solidifying, the first decorative sheet and the second decorative sheet are integrated with the molding resin, and then the injection mold is opened. The decorative molded product was held on the A mold side.

  When this test was repeated 50 times, the molded simultaneous decorative molded product was held on the A mold side in all 50 times. And it was possible to collect | recover the molding simultaneous decoration molded product continuously and stably by the collection | recovery apparatus with a suction apparatus 50 times.

  A pattern layer made of an acrylic resin is formed on a base sheet made of a polyethylene terephthalate film (easy adhesion treatment) with a thickness of 38 μm by a gravure printing method, and then an adhesive layer made of a vinyl chloride-vinyl acetate copolymer resin is formed by a gravure printing method. As a result, a first decorative sheet having a release weight of 10 gf / cm was prepared.

  On the other hand, a 25 μm-thick vinyl chloride film is laminated on one side of a 25 μm-thick polyethylene terephthalate film (easy adhesion treatment), and a wood grain pattern layer made of acrylic resin is formed on the opposite side by gravure printing. Then, a second decorative sheet having a release weight of 20 g / cm 2 was prepared by forming an adhesive layer made of a vinyl chloride resin by a gravure printing method.

  The prepared first decorative sheet is placed in the A mold of the injection mold attached with the ejector pin, and the second decorated sheet is placed in the B mold attached with the second ejector pin, and then acrylonitrile. A molding resin made of styrene copolymer resin is injected, cooled and solidified to integrate the first decorative sheet and second decorative sheet and the molding resin, and then the injection mold is opened. The decorative molded product was held on the A mold side.

  When this test was repeated 50 times, the molded simultaneous decorative molded product was held on the A mold side in all 50 times. And it was possible to collect | recover the molding simultaneous decoration molded product continuously and stably by the collection | recovery apparatus with a suction apparatus 50 times.

  Molded simultaneous decorative molded products obtained by this invention include upper and lower covers of mobile phone devices, surface parts and exterior parts of electronic application toys, rice cooker input panel, automobile interior / exterior panel, pachinko machine outer frame, etc. Available to:

All the drawings show the method for producing a simultaneously molded decorative molded product according to the present invention, and an injection mold used for these, a first decorative sheet, a second decorative sheet, a mold release weight measuring device, and these. An example of the simultaneously decorated decorative molded product obtained in this manner is shown.
The first decorative sheet and the second decorative sheet are inserted between the A mold and the B mold, and after mold clamping, the molding resin is injected, and the molding resin is filled in the molding space. It is sectional drawing of the injection mold shown. It is sectional drawing of the metal mold | die for simultaneous injection-molding decoration which shows the state by which the molding simultaneous decoration molded product was hold | maintained to A mold after mold opening. It is sectional drawing of the metal mold | die for injection molding simultaneous decorating which shows the state which a collection | recovery apparatus collects a molding simultaneous decorating molded product. It is sectional drawing of the collect | recovered simultaneous decoration decoration molded product. It is sectional drawing of the 1st decorating sheet which concerns on this invention. It is sectional drawing of the 2nd decorating sheet which concerns on this invention. It is sectional drawing of A metal mold | die of an injection mold. It is sectional drawing of the B metal mold | die of an injection mold. It is a schematic sectional drawing of a mold release weight measuring apparatus.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Molding resin layer 2 1st decorating sheet 3 2nd decorating sheet 4 Ejector pin 5 A die 6 B die 7 Molding resin 8 Gate 9 Second ejector pin 10 Molding simultaneous decorating molded product 12 Molding space part 13 Standard Surface 14 Concave portion 15 Recovery device 16 Chuck 17 Mold plate 20 First decorative layer 21 Base sheet 22 Overcoat layer 23 Design layer 24 Adhesive layer 25 Overcoat release layer 26 Anchor layer 30 Second decorative layer

Claims (2)

After the first decorative sheet is placed in the A mold of the injection mold with the ejector pins attached, the second decorative sheet is placed in the B mold of the injection mold, and then the A mold and the B mold Molding that forms a molding space by closing the mold and injects molding resin into the molding space to form an injection-molded product, and at the same time, integrally forms the first decorative sheet and the second decorative sheet. A method for producing a simultaneous decorative molded product,
The size of the second decorative sheet is set so as to cover almost the entire cavity surface of the B mold,
The release weight from the B mold of the second decorative sheet is set to be smaller than the release weight from the A mold of the first decorative sheet,
A method for producing a simultaneously molded decorative molded product, wherein the molded simultaneous decorative molded product is held in the A mold after the mold is opened. The method for producing a molded simultaneous decorative molded product according to claim 1, wherein the B mold further includes a second ejector pin that operates simultaneously with mold opening.

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