JP4346398B2 - Method for manufacturing injection-molded decorative product and injection-molding mold - Google Patents

Description

  In the simultaneous injection molding decoration method, a decoration sheet having a decoration layer is disposed on a base sheet between an A mold and a B mold of an injection mold, and the A mold and the B mold In this method, a molding resin is injected into a molding space formed by mold 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, from the need for improvement in design properties and physical properties of the surface of the molded resin, there is an injection molding simultaneous 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. In the spotlight. In the case of such an injection molding simultaneous double-sided decoration method, it is common to place a decorative sheet in both the A mold and the B mold and to inject a molding resin.

JP-A-6-99457

  However, when a decorative layer is formed on both surfaces of the molded resin layer, even if the obtained injection-molded simultaneous decorative molded product is held on the side of the mold A, it is difficult to eject with an ejector pin because there is a decorative sheet. However, there was a problem of damaging the injection-molded and simultaneously decorated molded product when trying to force it out with a strong force.

  Therefore, the present inventor has adopted the following configuration in order to solve the above problems. In the first aspect of the present invention, the first decorative sheet is placed on the A mold, the second decorative sheet is placed on the B mold, and then molded by closing the A mold and the B mold. For simultaneous injection molding for forming a first space and forming a first decorative sheet and a second decorative sheet at the same time by forming a molding space and injecting molding resin into the molding space It is a mold, an ejector pin is installed at a position different from the placement part of the first decorative sheet of the A mold, and a part of the molding space part is in contact with the tip of the ejector pin of the A mold This is a mold for simultaneous decorating of injection molding.

  In the second aspect of the present invention, the first decorative sheet is placed on the A mold, the second decorative sheet is placed on the B mold, and then molded by closing the A mold and the B mold. Forming a molding space and an auxiliary molding space and injecting molding resin into the molding space and the auxiliary molding space to form an injection-molded product, and at the same time, integrating the first decorative sheet and the second decorative sheet A mold for simultaneous injection molding for forming, wherein an ejector pin is installed at a position different from the placement part of the first decorative sheet of the A mold, and the auxiliary molding space part is an ejector pin of the A mold It is the metal mold | die for simultaneous injection-molding decoration characterized by contacting with the front-end | tip part.

  In the third aspect of the present invention, the first decorative sheet is placed on the A mold of the injection molding simultaneous decorating mold, and the second decorative sheet is placed on the B mold. Injection molding in which a molding resin is injected into a molding space formed between the decorative sheet and the second decorative sheet to form an injection molded product, and at the same time, the first decorative sheet and the second decorative sheet are integrally formed. A method for producing a simultaneous decorative product, wherein after the molding resin is cooled and solidified, a part of the simultaneous injection molded decorative product is ejected by an ejector pin of the A mold, thereby releasing the simultaneous injection molded decorative product from the A mold. It is a manufacturing method of the injection-molding simultaneous decorating product characterized by making it do.

  According to a fourth aspect of the present invention, the first decorative sheet is placed on the A mold of the simultaneous injection molding mold and the second decorative sheet is placed on the B mold. A molding resin is injected into the molding space and auxiliary molding space formed between the decorative sheet and the second decorative sheet to form an injection molded product, and at the same time, the first decorative sheet and the second decorative sheet are integrated. A method for producing injection-molded and simultaneously decorated products, wherein after the molded resin is cooled and solidified, the auxiliary molded product is ejected by the ejector pins of the A mold to release the simultaneous injection-molded decorative product from the A mold. It is a manufacturing method of the injection-molding simultaneous decorating product characterized by making it do.

  Moreover, the injection mold simultaneous decoration metal mold | die of this invention places a 1st decorating sheet in A metal mold | die, and after placing a 2nd decorating sheet in B metal mold, A metal mold | die and B metal mold | die Forming a molding space by closing the mold and injecting a molding resin into the molding space to form an injection-molded product and simultaneously forming the first decorative sheet and the second decorative sheet The mold for simultaneous injection molding decorating, wherein the ejector pin is installed at a position different from the placement part of the first decorative sheet of the A mold, and a part of the molding space part of the ejector pin of the A mold It is in contact with the tip. Therefore, even if the first decorative sheet is placed on the A mold, there is no problem in the operation of the ejector pin, and the effect that the molded simultaneous decorative molded product can be easily released from the A mold. is there.

  Moreover, the injection mold simultaneous decoration metal mold | die of this invention places a 1st decorating sheet in A metal mold | die, and after placing a 2nd decorating sheet in B metal mold, A metal mold | die and B metal mold | die A molding space and an auxiliary molding space are formed by closing the mold, and an injection molded product is formed by injecting molding resin into the molding space and the auxiliary molding space. A mold for simultaneous decoration of injection molding for integrally forming two decorative sheets, wherein an ejector pin is installed at a position different from the placement part of the first decorative sheet of the A mold, and an auxiliary molding space part Is in contact with the tip of the ejector pin of the A mold. Therefore, even if the first decorative sheet is placed on the A mold, there is no problem in the operation of the ejector pin, and the molded simultaneous decorative molded product can be easily released from the A mold, and There is an effect of preventing the product part of the simultaneous injection molded decorative product from being damaged.

  Moreover, the manufacturing method of the injection-molding simultaneous decorating product of this invention mounts a 1st decorating sheet in A metal mold | die of the said injection molding simultaneous decorating metal mold | die, and mounts a 2nd decorating sheet in B metal mold | die. The first decorative sheet and the second decorative sheet are simultaneously formed by injecting a molding resin into a molding space formed between the first decorative sheet and the second decorative sheet to form an injection molded product. Is a method of manufacturing an injection-molded simultaneous decorating product that integrally forms a mold, and after the molding resin has cooled and solidified, the ejector pin of the A mold ejects a part of the co-molded decorative product to inject from the A mold. It is characterized by releasing the simultaneously decorated decorative product. Therefore, there is an effect that an injection molded simultaneous decorative product can be easily obtained.

  In addition, after the first decorative sheet is placed on the A mold of the injection molding simultaneous decorating mold and the second decorative sheet is placed on the B mold, the first decorative sheet and the second decorative sheet are placed. Simultaneously with injection molding to form an injection molded product by injecting molding resin into the molding space and auxiliary molding space formed between the decorative sheet and the first decorative sheet and the second decorative sheet integrally. A method for producing a decorative product, characterized in that, after the molding resin is cooled and solidified, the auxiliary molded product is ejected by an ejector pin of the A mold, and the simultaneous injection-molded decorative product is released from the A mold. . Therefore, it is possible to prevent the product portion of the simultaneous injection-molded decorative product from being damaged and to obtain an injection-molded simultaneous decorative product easily.

  Hereinafter, the present invention will be described in detail with reference to the drawings. FIG. 1 is a plan view showing an example of a mold A of an injection molding simultaneous decorating mold of the present invention. FIG. 2 is a longitudinal sectional view taken along line XX of FIG. 1 showing an example of the injection molding simultaneous decorating mold of the present invention. FIG. 3 is a longitudinal sectional view taken along line YY of FIG. 1 showing an example of an injection molding simultaneous decorating mold of the present invention. FIG. 4: shows sectional drawing of the injection-molding simultaneous decorating product obtained by the manufacturing method of the injection-molding simultaneous decorating metal mold | die and injection molding simultaneous decorating product which concern on this invention. FIG. 5: shows sectional drawing of the 1st decorating sheet used for the manufacturing method of the injection-molding simultaneous decorating product which concerns on this invention.

  The injection molding simultaneous decorating mold of the present invention is a pair of injection molding simultaneous decorating molds arranged opposite to each other, the first decorating sheet 2 is set on the A mold 5 side, and on the B mold 6 side. After the second decorative sheet 3 is set, the mold is clamped, the molding resin is injected through the gate 8, and after the mold clamping, the molding space is filled with the molten molding resin and cooled and solidified. The mold 5 and the B mold 6 are opened, and then the ejector pins 4 formed on the A mold 5 directly project a part of the injection-molded simultaneous decorating product 10 or the auxiliary molded product 40 simultaneously with the injection molding. The decorative article 10 is a mold that is released from the A mold 5 (see FIG. 3). The auxiliary molded product 40 refers to a molded product that is cut and discarded after the product portion of the simultaneous injection-molded decorative product 10, and is a molded product obtained by filling the auxiliary molding space with the molding resin 7. .

  The A mold 5 is formed in a rectangular shape as in the prior art, and includes a reference surface that directly contacts the B mold 6 at the four circumferential ends. The inner part surrounded by the reference surface is formed with a concave portion having a shape adapted to the outer shape of the molded product, a clamp 13 for fixing the first decorative sheet 2 and an ejector pin 4 (see FIG. 1). An injection port for the gate 8 is formed near the lower portion of the molding space 12 of the A mold 5, and the molding resin 7 is injected through the gate 8.

  On the other hand, the B mold 6 is formed in a rectangular shape having a width and a height corresponding to the A mold 5, and includes a reference surface which is a flat surface that directly contacts the A mold 5. In the inner part surrounded by the reference surface, a concave portion having a shape adapted to the outer shape of the molded product and a clamp for fixing the second decorative sheet 3 are formed.

  And the 1st decorating sheet 2 moves A metal mold | die 5 right and left (refer FIG. 1), and the 2nd decorating sheet 3 can move B metal mold | die 6 up and down (refer FIG. 2). . The fixing position of the clamp 13 of the first decorative sheet 2 is set at a position different from the ejector pin 4 of the A mold 5 so that a part of the molding space portion is in contact with the tip of the ejector pin 4 of the A mold 5. Provided. Therefore, a part of the molding space is not covered with the first decorative sheet 2 (see FIG. 1).

  Therefore, the ejector pin 4 operates without being obstructed by the first decorative sheet 2, and can directly project a part of the injection-molded simultaneous decorative product 10 or the auxiliary molded product portion 40. The mold can be released from the A mold 5. In particular, when only the auxiliary molded product portion 40 is protruded, the product portion of the simultaneous injection molded decorative product 10 is not damaged at all.

  There may be only one auxiliary molded product portion 40, or a plurality of auxiliary molded product portions 40 may be provided. Correspondingly, only one ejector pin 4 or a plurality of ejector pins 4 may be provided (see FIG. 1).

  In the above example, the first decorative sheet 2 moves the A mold 5 left and right, and the second decorative sheet 3 moves the B mold 6 up and down. 2 may move the A mold 5 up and down, and the second decorative sheet 3 may be disposed so as to move the B mold 6 left and right.

  When the auxiliary injection molded product 40 is provided, the obtained injection molded simultaneous decorative article 10 is cut into a predetermined size and divided into a product and the auxiliary molded product 40. Cutting methods include cutting, laser processing, Thomson processing, die press processing, engraving blade processing (including thermal processing), and high-frequency processing.

  Next, the 1st decorating sheet 2 used for this invention is demonstrated. The 1st decorating sheet 2 is formed from the base sheet 21 and the decorating layer 20, and the decorating layer 20 consists of the design layer 23, the contact bonding layer 24, etc. (refer FIG. 6). The second decorative sheet used in the present invention also has the same configuration as the first decorative sheet 2, and the second decorative layer 30 also has the same configuration as the first decorative layer 20.

  As the base sheet 21, a single layer film selected from polycarbonate resin, polyamide resin, polyimide resin, polyester resin, acrylic resin, olefin resin, urethane resin, acrylonitrile butadiene styrene resin, or the like There are laminated films or copolymer films made of two or more resins selected from among the above.

  The thickness of the base sheet 21 is preferably 5 to 500 μm. If the sheet is less than 5 μm, handling at the time of mold setting is poor and the molding process becomes unstable. If the sheet exceeds 500 μm, the sheet is too rigid.

  An easy-adhesion layer may be formed on the base sheet 21 so that the decorative layer 20 adheres firmly. Examples of the material for the easy adhesion layer include polyester resins, acrylic resins, olefin resins, and urethane resins. As a method of providing the easy-adhesion layer, any of various coating methods may be used in addition to general-purpose printing methods such as gravure printing, screen printing, and offset printing.

  Examples of the material of the pattern layer 23 include acrylic resins, nitrified cotton resins, polyurethane resins, chlorinated rubber resins, vinyl chloride-vinyl acetate copolymer resins, polyamide resins, polyester resins, and epoxy resins. However, it is not particularly limited.

  Further, the pattern layer 23 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.

  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, 50 to 1200 mm is preferable. This is because if the thickness of the metal film layer is less than 50 mm, there is a problem that sufficient metallic luster cannot be obtained, and if it is more than 1200 mm, there is a problem that cracks are likely to occur.

  As a method of providing the pattern layer 23 in the entire surface or in a pattern, metal film formation such as gravure printing, screen printing, offset printing method, etc., tampo printing, painting, various coating methods, vapor deposition, ion plating, sputtering method, etc. There are laws.

  The adhesive layer 24 has an action of joining the first decorative layer 20 and the molded resin layer 1. The material of the adhesive layer 24 includes acrylic resin, nitrified cotton resin, polyurethane resin, chlorinated rubber resin, vinyl chloride-vinyl acetate copolymer resin, polyamide resin, polyester resin, epoxy resin, and polycarbonate resin. It is preferable to use a resin, an olefin resin, an acrylonitrile butadiene styrene resin, or the like.

  The thickness of the adhesive layer 24 is preferably 0.5 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 method for forming the adhesive layer 24 may be a general-purpose printing method such as gravure printing, offset printing, or screen printing, or any method such as painting, dipping, or reverse coater.

  When only the first decorative layer 20 is bonded to the molding resin 7, a release layer 22 may be provided between the base sheet 21 and the design layer 23. Alternatively, a release layer 25 may be provided on the base sheet 21 to provide a release base sheet.

  The release layer 22 may be made of acrylic resin, nitrified cotton resin, polyurethane resin, chlorinated rubber resin, vinyl chloride-vinyl acetate copolymer resin, polyamide resin, polyester resin, epoxy resin, polycarbonate resin. It is preferable to use a resin, an olefin resin, an acrylonitrile butadiene styrene resin, or the like.

  The thickness of the release layer 22 is preferably 0.5 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 method for forming the release layer 22 may be a general-purpose printing method such as gravure printing, offset printing, or screen printing, or any method such as painting, dipping, or reverse coater.

  The release layer 25 is made of acrylic resin, nitrified cotton resin, polyurethane resin, chlorinated rubber resin, vinyl chloride-vinyl acetate copolymer resin, polyamide resin, polyester resin, epoxy resin, polycarbonate. It is preferable to use a resin, an olefin resin, an acrylonitrile butadiene styrene resin, or the like.

  The thickness of the release layer 25 is preferably 0.5 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 release layer 55 may be formed by a general-purpose printing method such as gravure printing, offset printing, or screen printing, or any method such as painting, dipping, or reverse coater.

  The thickness of the release layer 25 is preferably 0.5 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 release layer 55 may be formed by a general-purpose printing method such as gravure printing, offset printing, or screen printing, or any method such as painting, dipping, or reverse coater.

  As the molding resin, a thermoplastic resin such as acrylic resin, polycarbonate resin, styrene resin, polyamide resin, noryl resin, polyester resin, olefin resin, urethane resin, or acrylonitrile butadiene styrene resin may be used. it can.

  The present invention relates to a mold for simultaneous injection molding decoration and a method for manufacturing an injection molded simultaneous decoration product. The mold for simultaneous injection-molding decoration and the method for producing the simultaneous injection-molded article according to the present invention are particularly suitable when decorating both surfaces of an injection-molded article. The injection molded simultaneous decorative molded product obtained by the present invention includes an upper cover and a lower cover of a mobile telephone device, surface parts and exterior parts of an electronic application toy, a rice cooker input unit panel, an automobile interior / exterior panel, and a pachinko machine. It can be used for frames.

All of the drawings are an embodiment of a mold for simultaneous injection molding and a method for manufacturing an injection molding simultaneous decoration according to the present invention, an injection molding simultaneous decoration obtained by using these, and a decorative sheet used for these An example is shown.
It is a top view of A metal mold | die seen from the B metal mold | die side of the injection mold simultaneous decorating metal mold | die which shows the state which opened the A metal mold | die and B metal mold | die after shaping | molding. It is XX sectional drawing of the metal mold | die for simultaneous injection molding decoration of FIG. It is the YY sectional view taken on the line of the injection-molding simultaneous decorating die of FIG. 1 showing a state in which the injection-molding simultaneously decorated product is projected by the ejector pin of the A mold after opening the mold. It is sectional drawing of the injection molding simultaneous decorating article obtained using the manufacturing method of the injection molding simultaneous decorating metal mold | die and injection molding simultaneous decorating product which concern on this invention. It is sectional drawing of the 1st decorating sheet used for the manufacturing method of the injection-molding simultaneous decorating product which concerns on this invention.

Explanation of symbols

1 A mold
2 First decorative sheet
3 second decorative sheet
4 Ejector pin
5 A mold
6 B mold
8 Gate 10 Injection Molding Simultaneously Decorated Product 13 Clamp 20 First Decorated Layer 21 Base Sheet 22 Peeling Layer 23 Pattern Layer 24 Adhesive Layer 25 Release Layer 26 Anchor Layer 30 Second Decorated Layer 40 Auxiliary Molded Product

Claims (2)

Simultaneously injection molding the molded product and the auxiliary molded product connected to the molded product, and integrating the first decorative sheet on one side of the molded product and the second decorative sheet on the other side of the molded product A mold for simultaneous injection-molding decoration, which can produce injection-molded simultaneously decorated products,
A mold on which the first decorative sheet is placed;
B mold on which the second decorative sheet is placed, and a molding space corresponding to the molded product and an auxiliary molding space corresponding to the auxiliary molded product are formed between the A mold by clamping. When,
A mold for simultaneous injection-molding decoration, comprising: an ejector pin installed at a position different from the placement part of the first decorative sheet of the A mold so that the tip part is in contact with the auxiliary molding space part. A method for producing an injection-molded simultaneous decorative article using the injection-molding simultaneous decoration mold according to claim 1,
Placing the first decorative sheet on the A mold, and placing the second decorative sheet on the B mold;
Clamping the previously placed A mold and the previously placed B mold to form the molding space portion and the auxiliary molding space portion;
A molding resin is poured into the formed molding space and the auxiliary molding space to form the molded product and the auxiliary molded product, and at the same time, the first decorative sheet and the second decorative sheet are added to the molded product. Integrating the process;
Cooling and solidifying the formed molded product and auxiliary molded product, and
A step of opening the mold and ejecting the cooled and solidified auxiliary molded product by the ejector pin, thereby releasing the cooled and solidified molded product and the auxiliary molded product from the A mold. Manufacturing method of simultaneous decorations.

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