JP2006224459A - Resin molded product, skin material used therein and its manufacturing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a resin molded product constituted so that metallic appearance can be simply applied to the surface of a molding base material comprising an olefinic resin to impart suitable appearance quality to the surface of the molding base material, a skin material used therein and its manufacturing method. <P>SOLUTION: The resin molded product 10 is constituted of the molding base material 11 made of the olefinic resin and the skin material 12 used for covering the surface of the molding base material 11. The skin material 12 is constituted by successively laminating a base layer 13, a metal layer 14 and an adhesive layer 15 from a surface side. The base layer 13 is formed of a film having elongation and the metal layer 14 is formed of the metal thin film provided on the back of the base layer 13 while the adhesive layer 15 is formed from an adhesive having adhesiveness with respect to the olefinic resin. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a resin molded product having a metallic appearance as a design surface, a skin material used therefor, and a method for producing the same.

2. Description of the Related Art Conventionally, for example, in vehicles, there are interior and exterior products such as garnishes and door trims, and the appearance of a resin molded product made of synthetic resin is made in a metallic (metallic) tone. For example, the switch handle described in Patent Document 1 expresses a metallic appearance by metal plating. In addition to the metal plating, as a method of making the appearance of the resin molded product metallic, for example, a method by insert molding using an insert film described in Patent Document 2 can also be mentioned. Furthermore, the method of coating the surface of a resin molded product is also mentioned.
JP 2003-317562 A JP-A-9-183136

  However, when metal plating is performed on a synthetic resin as in the conventional case, the synthetic resin that can be used as a molding substrate of a resin molded product is limited to a part such as ABS resin and acrylic resin. is there. In particular, in recent years, olefin-based resins have attracted attention and are frequently used as materials for molding substrates because of their high recyclability and high impact resistance compared to ABS resins, acrylic resins, and the like. However, an olefin resin is a material that is difficult to perform metal plating, and it has been difficult to impart a metallic appearance to such an olefin resin by a method using metal plating. Furthermore, from the environmental consideration, the tendency to avoid metal plating is increasing recently.

  On the other hand, in the case of the method by insert molding, it can be used even if the material of the molding substrate is an olefin resin. However, in the case of insert molding, the mold structure related to fixing of the insert film or the like tends to be complicated, and the production cost is likely to increase. In addition, in the mold, the injected molten resin is not sufficiently fused to the insert film, and the insert film may be peeled off after die cutting to cause a poor appearance. Furthermore, when the molten resin is injected, the insert film may not withstand the injection pressure and may be torn.

  In addition, in the case of the method by coating, it is possible to use an olefin resin. However, in the case of the method by painting, the work must be performed in a plurality of steps, and it is difficult to say that it is suitable for mass production, and there is a high possibility that the manufacturing cost increases. In addition, there are problems such as appearance defects such as unevenness and dissipation of volatile organic compounds.

  The present invention has been made paying attention to such problems existing in the prior art. The object is to make the surface of the molding substrate made of an olefin resin easy to have a metallic appearance, and to use a resin molded product that can have a suitable appearance quality It is providing a skin material and its manufacturing method.

  In order to achieve the above object, the invention of the resin molded product according to claim 1 has a molded base material made of olefin resin, and a skin material laminated on the surface of the molded base material, It is a resin molded product whose appearance of the design surface is metallic with a skin material, and the skin material is formed by laminating at least a base layer, a metal layer, and an adhesive layer in order from the design surface side. And the base layer is formed of a transparent film made of a thermoplastic resin having a breaking elongation of 50 to 300% as defined in JIS K 6251, and the metal layer is one surface of the film forming the base layer. The gist is that the adhesive layer is formed of an adhesive having adhesiveness to the olefin resin.

  According to the above configuration, the skin material has a metal layer, and a resin molded product is formed by laminating this skin material on the surface of the molding base material. The appearance quality of the resin molded product can be made metallic by the metal layer. In addition, it is possible to express metallic appearance quality by simply laminating the skin material on the surface of the molding substrate, and it is not necessary to work in multiple steps, making it suitable for mass production and reducing manufacturing costs. Reduction can be achieved. Furthermore, the base layer of the skin material has a break elongation specified by JIS K 6251 of 50 to 300% and has a suitable elongation, so that the surface shape of the molded base material has a complicated three-dimensional shape. Even in this case, it is possible to suitably follow the surface shape. Furthermore, it is possible to make it difficult to peel off the skin material by adhering the skin material to the surface of the molded substrate with the adhesive layer. As a result, the surface of the molding substrate made of an olefin resin can be easily made to have a metallic appearance, and suitable appearance quality can be obtained.

  The invention of the resin molded article according to claim 2 is the invention according to claim 1, wherein the winding portion is wound on the back surface of the molding base material by winding the edge portion of the skin material on the back surface. The gist is that is formed.

  According to the above configuration, for example, in the case of insert molding, when the resin molded product is viewed from the back side, the molded base material is exposed, leading to a decrease in appearance quality. Even if it is a case visually recognized from the side, the forming substrate is covered with the winding portion. As a result, it is possible to improve the appearance quality by covering not only the front surface but also the back surface with the skin material.

  The invention of the skin material according to claim 3 is used to make the appearance of the design surface of the resin molded product to be metallic, and is laminated on the surface of the molding substrate made of olefin resin constituting the resin molded product. It is a skin material, and is formed by laminating at least a base layer, a metal layer, and an adhesive layer in order from the side that becomes the design surface when the resin molded product is used. It is formed from a transparent film made of a thermoplastic resin having a breaking elongation defined by K 6251 of 50 to 300%, and the metal layer is formed from a metal thin film provided on one surface of the film forming the base layer The gist is that the adhesive layer is formed of an adhesive having adhesiveness to the olefin resin.

  According to the above configuration, the configuration of the skin material can be simplified, and the manufacturing cost can be reduced. Furthermore, the base layer of the skin material has a fracture elongation of 50 to 300% as defined in JIS K 6251 and has a suitable elongation, so that the surface shape of the molded base material to be adhered is complicated. Even in the case of a three-dimensional shape, it is possible to suitably follow the surface shape. Furthermore, it is possible to make it difficult to peel off the skin material by adhering the skin material to the surface of the molded substrate with the adhesive layer. As a result, the surface of the molding substrate made of an olefin resin can be easily made to have a metallic appearance, and suitable appearance quality can be obtained.

  The invention of the method for producing a resin molded product according to claim 4 is the method for producing the resin molded product according to claim 1, wherein the molding base is disposed on the adhesive layer side of the skin material, After heating and softening the skin material, with the skin material as a boundary, the adhesive layer side of the skin material is a reduced pressure atmosphere, the base layer side of the skin material is a normal pressure atmosphere or a pressurized atmosphere, The gist is to bring the adhesive layer of the skin material into contact with the surface of the molding substrate.

  According to the said structure, it is possible to make the external appearance quality of a resin molded product into a metal tone by the simple operation | work which only softens a skin material and contacts the surface of a shaping | molding base material. Therefore, it is not necessary to perform the work in a plurality of steps, which is suitable for mass production, and it is possible to reduce the manufacturing cost. Further, with the skin material as a boundary, the adhesive layer side of the skin material is a reduced pressure atmosphere, and the base layer side is a normal pressure atmosphere or a pressurized atmosphere. Thus, the skin material can be adsorbed on the surface of the molding substrate on the adhesive layer side in a reduced pressure atmosphere, and the skin material is molded on the base layer side due to a pressure difference with the adhesive layer side. Can be crimped to the surface. As a result, the skin material can be made to suitably follow the surface shape of the molded base material, the surface of the molded base material made of olefin resin can be easily made into a metallic appearance, and a suitable appearance It can be quality.

  The invention of the method for producing a resin molded article according to claim 5 is the invention according to claim 4, wherein the edge of the skin material is contacted with the adhesive layer of the skin material and the surface of the molding substrate. The gist is that the range of the edge portion that is wound around the back surface of the molding substrate and the edge portion that is wound around the back surface of the molding substrate is 1 mm or more from the edge of the skin material.

  According to the above configuration, there is no need to wrap the edge portion of the skin material around the back surface of the molded base material by providing a post-process, etc., and the operation of attaching the skin material to the surface of the molded base material, It is possible to carry out the work of entraining the back surface of the molded substrate in one step. Moreover, a skin material can be suitably wound around the back surface of a shaping | molding base material by making the range wound around the back surface of a shaping | molding base material into 1 mm or more from the edge of a skin material.

  ADVANTAGE OF THE INVENTION According to this invention, while being able to make the surface of the shaping | molding base material which consists of olefin resin easily a metal-like external appearance, it becomes possible to set it as suitable external appearance quality.

  Hereinafter, an embodiment embodying the resin molded product of the present invention will be described. The resin molded product of the present invention has a metallic (metallic) appearance on the design surface visible from the outside. Such resin molded products include not only interior and exterior products such as vehicle garnishes and door trims, but also various fields such as household appliances such as refrigerators, air conditioners, personal computers and mobile phones, furniture such as desks, chairs and storage shelves. Used in.

First, the configuration of the resin molded product 10 will be described.
As shown in FIG. 1, the resin molded product 10 includes a molded base material 11 and a skin material 12 laminated on the surface of the molded base material 11. The molding substrate 11 is formed such that the surface on the upper surface side in FIG. Moreover, the shaping | molding base material 11 is formed so that the back surface used as the lower surface side in FIG. The resin molded product 10 of the present embodiment has a design surface that corresponds to the entire surface and a part of the back surface, that is, the entire surface of the molded base material 11 and the edge of the back surface of the molded base material 11. The molding substrate 11 is formed from an olefin resin such as polyethylene or polypropylene. If the olefin-based resin is, for example, a vehicle exterior product, it has a property of being superior in impact resistance compared to ABS resin and acrylic resin when a stepping stone collides. In addition, in order to improve the impact resistance, a rubber elastic component such as rubber or elastomer may be blended.

  The skin material 12 is formed by laminating a base layer 13, a metal layer 14, and an adhesive layer 15 in order from the design surface side of the resin molded product 10. The base layer 13 is made of a transparent synthetic resin. The base layer 13 also has a function as a protective layer for protecting the metal layer 14. The metal layer 14 is formed of a metal thin film provided on the back surface of the base layer 13. The metal layer 14 is visible from the outside because the base layer 13 is formed of a transparent film, and the appearance of the design surface of the resin molded product 10 is metallic. The adhesive layer 15 is formed from an adhesive applied to the back surface of the metal layer 14. The adhesive layer 15 suppresses peeling of the skin material 12 from the surface of the molding base material 11 by bonding the skin material 12 to the surface of the molding base material 11.

  Further, the skin material 12 is provided not only on the front surface but also on the back surface of the design surface of the resin molded product 10. That is, the skin material 12 forms the winding part 12a which coat | covers the back surface of this shaping | molding base material 11 by winding the edge part to the back surface of the said shaping | molding base material 11. FIG. And by providing this winding part 12a, in the design surface of the resin molded product 10, the external appearance quality in the back surface is improved.

Next, the configuration of the skin material 12 will be described.
As shown in FIG. 2, the skin material 12 includes the base layer 13, the metal layer 14, and the adhesive layer 15 that are sequentially laminated from the surface side that is the upper surface in FIG. A release paper 16 is provided on the back surface.

  The base layer 13 is formed from a transparent film made of a thermoplastic resin. Examples of the thermoplastic resin include polyester, polypropylene, polyvinyl chloride, acrylic resin, urethane resin, and fluorine resin, and an amorphous resin is used from the viewpoint of making it transparent. The term “transparent” is not limited to colorless and transparent (clear), but is also transparent in black (smoke), transparent in red (clear red), transparent in blue (clear blue), transparent in yellow (clear yellow), and transparent in orange (clear orange) ) Etc. are also included. Further, when the base layer 13 is colored and transparent, the base layer 13 itself may be colored and transparent by mixing a dye into a thermoplastic resin or the like, and a coating is applied to the surface of the base layer 13 or the surface is coated. For example, a colored layer may be provided on the surface of the base layer 13.

  From the viewpoint of suitably following the surface shape of the molded base material 11 having a three-dimensional shape, the base layer 13 has an elongation at break specified in JIS K 6251 of 50 to 300%. The elongation at break of the base layer 13 is preferably 50 to 150% at normal temperature (20 to 25 ° C.) and 50 to 300% at 50 to 120 ° C. If the elongation at break is less than 50%, the surface shape of the molded base material 11 cannot be suitably followed, and there is a possibility that the material will break when stuck to the molded base material 11. On the other hand, when the elongation at break exceeds 300%, a dramatic improvement in the performance of suppressing breakage during sticking to the molded substrate 11 is not observed. On the other hand, the metal layer 14 and the adhesive layer 15 cannot follow the elongation of the base layer 13, and the thickness of the metal layer 14 and the adhesive layer 15 may be uneven or may break.

  The base layer 13 has a function as a core material in the skin material 12. Therefore, from the viewpoint of adjusting the thickness, flexibility, rigidity, strength and the like of the skin material 12, the thickness of the base layer 13 is preferably 12 to 1000 μm. When the thickness is less than 12 μm, the rigidity, strength, and the like of the skin material 12 are lowered, and the skin material 12 may be easily broken. On the other hand, when thickness exceeds 1000 micrometers, there exists a possibility that the softness | flexibility of the skin material 12 may fall.

  The base layer 13 preferably has a visible light transmittance of 80 to 95% from the viewpoint that the metallic color tone of the metal layer 14 is visible from the outside. When the visible light transmittance is less than 80%, the metal layer 14 becomes difficult to visually recognize from the outside, and the appearance quality of the resin molded product 10 may be deteriorated. On the other hand, even if the visible light transmittance exceeds 95%, it does not contribute to the improvement of the appearance quality, but on the contrary, the manufacturing cost increases due to the rising material cost.

  The base layer 13 preferably has a surface glossiness of 70 to 98 from the viewpoint that the appearance of the resin molded product 10 has a suitable metallic tone. When the surface glossiness is less than 70, the appearance quality may be deteriorated, for example, the appearance of the resin molded product 10 becomes dull metallic. On the other hand, when the surface glossiness exceeds 98, it does not contribute so much to the improvement of the appearance quality, but fine scratches or the like may be conspicuous and the appearance quality may be deteriorated.

  The base layer 13 may be laminated with a layer made of a thermoplastic resin on the surface from the viewpoint of imparting weather resistance or improving surface hardness. Examples of the laminating method include a laminating method by dry lamination, heating lamination, etc., a method of applying a molten resin, and the like. In addition, when improving surface hardness, it is preferable to laminate | stack the layer which consists of acrylic resins, and to make the surface hardness H-2H in pencil hardness. In addition, as described above, when a colored layer is provided on the surface of the base layer 13, the design surface of the resin molded article 10 made of the skin material 12 can be obtained by including a filler such as talc or mica in the colored layer. The appearance may be a metallic pearl tone or the like. In addition, by making the colored layer semi-transparent, the appearance of the design surface of the resin molded article 10 made of the skin material 12 may be a blunt metal tone or the like. In addition, the base layer 13 itself may be translucent by blending the base layer 13 with a matting agent as a matting agent or embossing the base layer 13.

  The metal layer 14 is formed of a metal thin film formed on the back surface of the base layer 13 by physical vapor deposition (PVD) such as vapor deposition or sputtering, or chemical vapor deposition (CVD). . The metal layer 14 of this embodiment is formed by vapor deposition or sputtering. Moreover, as a metal which forms the metal layer 14, simple substance, such as aluminum, chromium, nickel, tin, indium, or these alloys are mentioned.

  The metal layer 14 is formed of an aggregate of metal thin films that form fine dots from the viewpoint of providing elongation together with the base layer 13. That is, when the base layer 13 is stretched, for example, in the case of a metal layer formed from an integrated metal thin film, the base layer 13 may be broken. On the other hand, the metal layer 14 formed from an aggregate of a plurality of metal thin films having a fine dot shape suppresses the breakage of the metal layer 14 by expanding the distance between the metal thin films when the base layer 13 is stretched. is doing. In addition, since the metal layer 14 is formed of an aggregate of a plurality of metal thin films that form fine dots, the visible light transmittance is higher than that of a metal layer formed of an integrated metal thin film. It has the property of Therefore, the metal layer 14 preferably has a visible light transmittance of 2 to 25%. When the visible light transmittance is less than 2%, the metal layer 14 may be broken when the base layer 13 is stretched. On the other hand, when the visible light transmittance exceeds 25%, it becomes difficult to conceal the molded base material 11 with the metal layer 14, and the color tone of the molded base material 11 is displayed on the design surface of the resin molded product 10. May decrease. In addition, the visible light transmittance of the metal layer formed from the integrated metal thin film is approximately 0%.

  From the viewpoint that the metal layer 14 can be stretched together with the base layer 13, the elongation at break specified in JIS K 6251 is preferably 50 to 150% at room temperature (20 to 25 ° C.), and 50 to 120. It is 50 to 300% at ° C. If the elongation at break is less than 50%, the elongation of the base layer 13 cannot be followed, and the appearance quality of the resin molded product 10 may be deteriorated by causing breakage (cracking) or whitening. On the other hand, even if the elongation at break exceeds 300%, the elongation is not significantly affected. On the other hand, the visible light transmittance is excessively increased and the appearance quality may be deteriorated.

  The thickness of the metal layer 14 is preferably 0.04 to 0.08 μm from the viewpoint of adjusting the thickness, flexibility, rigidity, strength, and the like of the skin material 12 and making the appearance of the metal tone suitable. It is. When thickness is less than 0.04 micrometer, there exists a possibility that the color tone of the shaping | molding base material 11 may be exposed on the design surface of the resin molded product 10, and there exists a possibility that external appearance quality may fall. When the thickness exceeds 0.08 μm, the rigidity, strength and the like of the skin material 12 become excessively high, and the skin material 12 may be inferior in flexibility.

  The said adhesive layer 15 is formed from the adhesive agent which has adhesiveness with respect to an olefin resin from the viewpoint of making the skin material 12 adhere to the shaping | molding base material 11 made from an olefin resin. Examples of such adhesives include acrylic adhesives, rubber adhesives, and hot-melt heat-sensitive adhesives such as acrylic, urethane, olefin, polyester, and nylon.

  From the viewpoint that the adhesive layer 15 can be stretched together with the base layer 13, the elongation at break specified in JIS K 6251 is preferably 50 to 150% at room temperature (20 to 25 ° C.), and 50 to 120. It is 50 to 300% at ° C. When the elongation at break is less than 50%, the elongation of the base layer 13 cannot be followed, and there is a possibility that a portion that is not bonded to the molded base material 11 may be generated due to breakage or the like. On the other hand, even if the breaking elongation exceeds 300%, the elongation is not affected so much, and there is a possibility that the adhesive easily protrudes to the periphery of the resin molded product 10.

  The thickness of the adhesive layer 15 is preferably 20 to 160 μm from the viewpoint of maintaining suitable adhesion to the molded substrate 11 and making the appearance quality of the resin molded product 10 suitable. If the thickness is less than 20 μm, the base layer 13 may be unevenly stretched, or the skin material 12 may not be sufficiently bonded to the molded substrate 11. On the other hand, when the thickness exceeds 160 μm, the adhesiveness is not improved so much. On the other hand, the design surface of the resin molded product 10 becomes uneven, or the adhesive protrudes from the periphery of the resin molded product 10, thereby causing an appearance. There is a risk of quality degradation.

  The adhesive layer 15 has an adhesive strength of preferably 4 N or more in the 180 ° peel strength test defined in JIS Z 0238, from the viewpoint of suitably bonding the skin material 12 to the molded substrate 11. Moreover, in order to maintain the adhesive strength of 4N or more, the surface of the molding substrate 11 may be subjected to a primer treatment or the like.

  The release paper 16 is provided to protect the adhesive layer 15 when the skin material 12 is conveyed. Therefore, the release paper 16 is peeled from the adhesive layer 15 when the skin material 12 is bonded to the molding substrate 11. For this reason, the release paper 16 that can be adhered to the adhesive layer 15 and easily peeled from the adhesive layer 15 is used. As such a release paper 16, it is preferable to use a film having a smooth surface made of polyolefin such as polyethylene or polypropylene, polyester or the like.

Next, a method for manufacturing the resin molded product 10 will be described.
The resin molded product 10 is manufactured using a vacuum lamination apparatus. A vacuum lamination device is a sheet that is softened by heating, and the pressure is applied to the other side of the sheet after the other side of the sheet is evacuated. It is a device for doing. And by using the said skin material 12 as a sheet | seat, the resin molded product 10 is manufactured using this vacuum lamination apparatus. Here, in the skin material 12, the surface on the base layer 13 side corresponds to one surface side of the sheet, and the surface on the adhesive layer 15 side corresponds to the other surface side of the sheet. In addition, when using a vacuum lamination apparatus, a part of skin material 12 is wound in the back surface of the shaping | molding base material 11, and forms the said winding part 12a. Further, the molded base material 11 and the skin material 12 adhered to each other are taken out from the vacuum lamination apparatus, and then the surplus skin material 12 is cut off on the back surface of the molding base material 11 to be a resin molded product 10. . In other words, as a result of cutting off the surplus skin material 12, a part of the skin material 12 wound around the back surface of the molded base material 11 becomes an edge portion of the skin material 12 covering the molded base material 11.

  In the formation of the winding part 12a, the edge part to be wound around the back surface of the molding substrate 11, that is, the range to be the winding part 12a is preferably from the edge of the skin material 12 (edge of the winding part 12a). 1 mm or more. When the range is less than 1 mm, the edge portion of the skin material 12 is less likely to be caught on the back surface of the molding substrate 11, and it becomes difficult to form the winding portion 12a.

  The winding portion 12a can be formed only by causing a pressure difference between one surface and the other surface of the skin material 12. That is, in the case of insert molding, for example, the skin material 12 can be pressed by the injection pressure, but cannot be adsorbed on the surface of the molding substrate 11, and the winding portion 12a cannot be formed. On the other hand, according to the method, by making the other surface side of the skin material 12 vacuum (reduced pressure atmosphere), not only the skin material 12 is adsorbed on the surface of the molding substrate 11, but also one surface side of the skin material 12 is The skin material 12 can be press-contacted so that it may follow the surface of the shaping | molding base material 11 by setting it as a normal pressure (normal pressure atmosphere). Therefore, the winding part 12a will be formed by the adsorption | suction and the crimping | compression-bonding to the shaping | molding base material 11 by a pressure difference.

The effects exhibited by the above embodiment will be described below.
According to the resin molded product 10 of the embodiment, the skin material 12 is provided so as to cover the surface of the molding base material 11, and the skin material 12 is bonded to the molding base material 11. The skin material 12 has a metal layer 14. For this reason, the appearance of the design surface of the resin molded product 10 can be made metallic by a simple method of bonding the skin material 12 to the surface of the molded base material 11.

  Moreover, the winding part 12a is formed by winding the skin material 12 in the back surface of the shaping | molding base material 11. FIG. For this reason, also on the design surface of the resin molded product 10 which becomes the back surface of the molding substrate 11, the appearance can be made metallic.

  Moreover, the skin material 12 is formed in a sheet shape, has elongation, and can be used regardless of the surface shape of the molding base material 11. For this reason, the skin material 12 can be joined even after the molding substrate 11 is molded. That is, for example, even after the molded base material 11 is used as the resin molded product 10, the skin material 12 can be provided in accordance with the preference and the like.

  In addition, the method for manufacturing the resin molded product 10 is a simple method in which after the skin material 12 and the molding base material 11 are set, a pressure difference is generated between the front surface side and the back surface side of the skin material 12. For this reason, while being able to manufacture the resin molded product 10 in a short time and in large quantities, the skin material 12 can be suitably adapted to the surface shape of the molding substrate 11, and the resin molded product 10 with good appearance quality can be obtained. Obtainable.

  -Moreover, the winding part 12a can be formed easily by producing a pressure difference.

Examples that further embody the present invention will be given below.
(Molding of molding substrate)
A molding substrate 11 made of polyolefin was molded by injection molding. As the polyolefin, a polymer alloy of polypropylene and polyethylene (manufactured by Sumitomo Chemical) was used, and 20% by mass of talc was further blended.

Example 1
A transparent film (thickness 40 μm) made of urethane blended with non-yellowing isocyanate was used as the base layer 13, and tin was vacuum-deposited on one surface to form a metal layer 14. At this time, the metal layer 14 had a visible light transmittance of 10% (OD value: 1.0). Thereafter, an acrylic pressure-sensitive pressure-sensitive adhesive formed by blending an isocyanate crosslinking agent mainly composed of an acrylate ester is applied to one surface of the metal layer 14 so as to have a thickness of 40 μm using a reverse coater and bonded. Layer 15 was formed. Thus, the skin material 12 of Example 1 was obtained.

  Then, the skin material 12 was adhere | attached on the surface of the shaping | molding base material 11 using the vacuum lamination apparatus, and the resin molded product 10 was obtained. When the vacuum lamination apparatus was evacuated, the pressure in the apparatus was 0.004 to 0.008 MPa (30 to 60 mmHg), and the surface temperature of the skin material 12 during heating was 90 ° C. At the time of molding, the inside of the apparatus was evacuated and then the apparatus was brought to atmospheric pressure by opening it to the atmosphere.

  As a result of visually recognizing and evaluating the resin molded product 10 obtained as described above, it was a mirror-like metallic tone similar to metal plating, and the appearance was good. The surface shape of the molding substrate 11 was also suitably reproduced. Moreover, the skin material 12 was wound around the back surface of the molding base material 11 at the edge of the resin molded product 10 to form a winding portion 12a.

(Comparative Example 1)
A metallic paint (acrylic polyester resin) containing aluminum flakes was applied to the surface of the molding substrate 11 by spraying, and a top coat (clear) was further applied to obtain a metallic resin molded product.

  As a result of visually recognizing and evaluating the resin molded product obtained as described above, the surface shape of the molded base material is suitably reproduced, and at the edge of the resin molded product, the back surface of the molded base material is also metallic. It was said. However, since it is aluminum flakes, it is not a mirror-like metallic tone but a blunt metallic tone, which is inferior in appearance to Example 1.

(Comparative Example 2)
Metallic printing was applied to the back surface of the acrylic fluorine-based film, a urethane adhesive was applied, and a polypropylene sheet was adhered to obtain a sheet for insert molding. Using this, the molding substrate 11 was injection molded by insert molding, and the sheet was welded to obtain a resin molded product.

  As a result of visually recognizing and evaluating the resin molded product obtained as described above, it had a mirror-like metallic tone similar to that of metal plating, and the appearance was good. The surface shape of the molding substrate 11 was also suitably reproduced. However, at the edge of the resin molded product, the back surface of the molding substrate 11 was exposed, and the appearance was inferior to that of Example 1.

(Comparative Example 3)
A skin material 12 similar to that of Example 1 was bonded to the surface of the molding substrate 11 while being heated by a dryer, and a resin molded product was obtained.

As a result of visually recognizing and evaluating the resin molded product obtained as described above, the skin material 12 was whitened, and the appearance was inferior to that of Example 1. Moreover, wrinkles and bubbles were formed, and the surface shape of the molded base material 11 was not sufficiently reproduced. Furthermore, at the edge of the resin molded product, there was a portion where the skin material 12 was peeled off from the molded substrate 11.
(Example of change)
In addition, this embodiment can also be changed and embodied as follows.

The adhesive layer 15 is not necessarily provided on the back surface of the metal layer 14, and the adhesive layer 15 may be formed by applying an adhesive to the surface of the molding substrate 11.
-The winding part 12a does not necessarily need to be provided, and may be provided as necessary. However, even if the winding part 12a is a resin molded product 10 that is not visually recognized from the outside, the provision of the winding part 12a makes it possible to clarify the outline of the resin molded product 10 and improve the appearance quality. It is done.

Sectional drawing which shows the resin molded product of embodiment. Sectional drawing which shows the skin material of embodiment.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 ... Resin molded article, 11 ... Molding base material, 12 ... Skin material, 12a ... Winding part, 13 ... Base layer, 14 ... Metal layer, 15 ... Adhesive layer.

Claims (5)

A resin molded product having a molding base made of an olefin resin and a skin material laminated on the surface of the molding base, and having a metallic appearance on the design surface by the skin material,
The skin material is formed by laminating at least a base layer, a metal layer, and an adhesive layer in order from the design surface side.
The base layer is formed from a transparent film made of a thermoplastic resin having an elongation at break specified in JIS K 6251 of 50 to 300%,
The metal layer is formed from a metal thin film provided on one surface of the film forming the base layer,
The said adhesive layer is formed from the adhesive agent which has adhesiveness with respect to olefin resin, The resin molded product characterized by the above-mentioned. 2. The resin molded product according to claim 1, wherein a winding portion is formed on the back surface of the molding base material by winding an edge portion of the skin material on the back surface. A skin material that is used to make the appearance of the design surface of a resin molded product metallic, and is laminated on the surface of a molding substrate made of an olefin resin that constitutes the resin molded product,
In order from the side that becomes the design surface when the resin molded product is used, at least a base layer, a metal layer, and an adhesive layer are laminated,
The base layer is formed from a transparent film made of a thermoplastic resin having an elongation at break specified in JIS K 6251 of 50 to 300%,
The metal layer is formed from a metal thin film provided on one surface of the film forming the base layer,
The said contact bonding layer is formed from the adhesive agent which has adhesiveness with respect to olefin resin, The skin material characterized by the above-mentioned. It is a manufacturing method of the resin molded product according to claim 1,
After the molding substrate is disposed on the adhesive layer side of the skin material, and the skin material is further heated and softened, with the skin material as a boundary, the adhesive layer side of the skin material is in a reduced pressure atmosphere, A method for producing a resin molded product, characterized in that the base layer side of the skin material is at an atmospheric pressure or a pressurized atmosphere, and the adhesive layer of the skin material is brought into contact with the surface of the molding substrate. At the time of contact between the adhesive layer of the skin material and the surface of the molding substrate, the edge of the skin material is wound around the back surface of the molding substrate and the edge material is wound around the back surface of the molding substrate. The method for producing a resin molded product according to claim 4, wherein a range of the portion is set to 1 mm or more from an edge of the skin material.

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