JP4054841B2 - Manufacturing method of uneven pattern decorative sheet - Google Patents

Description

The present invention relates to a method for producing a concavo-convex pattern decorative sheet used for decorating resin molded products such as building materials, automotive interior / exterior components, home appliance components, and mobile phone components.

  Conventionally, there has been a transfer material in which a transparent release layer, a metal thin film layer, an adhesive layer, and the like are sequentially formed on an uneven surface of a substrate sheet having a fine uneven shape on the surface. After the adhesive layer side of the transfer material having such a structure is in close contact with the resin molded product and heated and pressurized, when the base sheet is peeled off and removed from the release layer, the uneven shape of the base sheet is formed on the release layer surface. It is copied, and fine uneven shapes such as a hairline pattern, a spin pattern, a mat pattern, and a knurled pattern can be imparted to the surface of the molded product.

  However, there is a problem in that scratches are likely to be noticeable in such a pattern made of fine irregularities formed on the surface of the release layer. That is, when a concavo-convex shape is formed along a certain direction, such as a hairline pattern, if a scratch occurs in a direction different from this direction, the scratch becomes very conspicuous. Further, even if the scratches are such that only the convex vertices of the fine uneven shape are crushed, it appears that a larger scratch has occurred than the actual crushed state of the vertices.

  In addition, since the transfer material has a thin film thickness, and the release layer located above the metal thin film layer is thin, there is a problem that only a decoration lacking a heavy feeling can be obtained.

  Therefore, after the transfer processing, it is possible to further coat the transparent resin to increase the surface strength of the molded product and to form a transparent layer with a large thickness, but the surface uneven shape of the release layer is buried, There is a problem that the sharpness of the pattern expressed by the uneven surface shape is lost or the pattern disappears.

Accordingly, an object of the present invention is to solve the above-mentioned problems, and to provide a method for producing a concavo-convex pattern decorating sheet that is less likely to damage a fine concavo-convex pattern and has an excellent profound feeling.

In order to achieve the above object, the method for producing a concavo-convex pattern decorative sheet according to the present invention is configured as follows.

That is, the method for producing a concavo-convex pattern decorative sheet according to the present invention provides a transfer material in which a transparent layer is provided at least on a concavo-convex surface of a base sheet having a fine concavo-convex surface on a transparent base sheet having three-dimensional processability. bonding the transparent layer side, forming a transparent uneven layer by removing by peeling the substrate sheet with the transparent layer, then the concave and convex pattern decorative sheet by at least forming an adhesive layer on the transparent uneven layer Configured to get.

Further, the transparent layer side of the transfer material provided with at least a transparent layer is adhered to the uneven surface of the substrate sheet having a fine uneven surface on a transparent substrate sheet having three-dimensional processability, and the substrate sheet is formed as a transparent layer. A transparent concavo-convex layer was formed by peeling and removing between, and then a concavo-convex decorative sheet was obtained by forming at least a glittering layer and an adhesive layer on the transparent concavo-convex layer.

  Since this invention consists of an above-described structure, it has the following effects.

  The method for producing a concavo-convex pattern decorative sheet according to the present invention includes a transparent layer of a transfer material in which at least a transparent layer is provided on a concavo-convex surface of a base sheet having a fine concavo-convex surface on a transparent base sheet having three-dimensional processability. Adhering the sides, forming the transparent uneven layer by peeling and removing the base sheet from the transparent layer, and then forming the above uneven pattern decorative sheet by forming at least the adhesive layer on the transparent uneven layer Therefore, it is possible to easily obtain a concavo-convex pattern-decorating sheet that is not easily damaged and that has a profound feeling.

  Embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a cross-sectional view showing an embodiment of a concavo-convex pattern decorative sheet obtained by the present invention. FIG. 2 is a cross-sectional view showing an embodiment of a transfer material used in the method for producing a concavo-convex pattern decorative sheet according to the present invention. FIG. 3 is a cross-sectional view showing the uneven width and uneven depth of the transparent uneven layer of the uneven pattern decorating sheet obtained by the present invention. 4-5 is sectional drawing which shows the process of manufacturing an uneven | corrugated pattern molded article using the uneven | corrugated pattern decorating sheet obtained by this invention. FIG. 6: is sectional drawing which shows one Example of the uneven | corrugated pattern molded article which can be obtained using the uneven | corrugated pattern decorating sheet obtained by this invention. In the figure, 10 is a decorative pattern decorative sheet, 11 is a substrate sheet, 12 is a transparent uneven layer, 13 is a glitter layer, 14 is an adhesive layer, 20 is a transfer material, 21 is a base sheet, 22 is a transparent layer, 23 Is an adhesive layer, 30 is an uneven pattern molded product, 31 is a mold, and 32 is a molding resin.

The concave / convex decorative sheet 10 obtained by the present invention has a transparent concave / convex layer 12 having a fine concave / convex shape laminated at least on the back side of a transparent substrate sheet 11 having three-dimensional processability, and the fine concave / convex shape of the transparent concave / convex layer 12. Is not exposed on the surface of the concavo-convex pattern decorative sheet 10, and the concavo-convex pattern decorative sheet 10 is stretched in the longitudinal direction and the lateral direction in a tensile test based on Japanese Industrial Standard (JIS) C2318 in an atmosphere of 110 ° C. It is preferable that the transparent concavo-convex layer 12 has a fine concavo-convex shape having a concavo-convex width of 0.2 to 200 μm and a depth of 0.10 to 10 μm after being stretched to 200% (see FIG. 1).

  In order to obtain the concavo-convex pattern decorative sheet 10 having such a configuration, it is preferable to use the transfer material 20. As the transfer material 20, a material in which at least a transparent layer 22 is formed on a base sheet 21 having an uneven surface is used (see FIG. 2).

  As a material of the base sheet 21, a material used as a base sheet of a normal transfer material such as a polypropylene resin, a polyethylene resin, a polyamide resin, a polyester resin, an acrylic resin, or a polyvinyl chloride resin should be used. Can do.

  A fine uneven shape is formed on the surface of the base sheet 21. By peeling off the base sheet 21 in a later step, the fine uneven shape of the base sheet 21 is copied to the transparent layer 22 to express a fine uneven shape such as a hairline pattern, a spin pattern, a mat pattern, or a knurled pattern. it can.

  As a method of creating a fine uneven shape on the surface of the base sheet 21, there is a film excavation method in which the surface of the base sheet 21 is scratched by rubbing with a wire brush, sandpaper, steel wool or the like. Further, there is a matting agent kneading method in which a matting agent is kneaded into a material of a base sheet raw material, and the matting agent rises on the surface in a sheeted state to make it uneven. In addition, there is a mat agent coating method in which an ink in which a resin, a mat agent, and a solvent are mixed is coated on the base sheet 21, and after the solvent is dried, the mat agent is raised on the resin surface to make the surface uneven. Further, there is a pressing method in which the base sheet 21 made of a thermoplastic resin is pressed with a concavo-convex mold by applying pressure while applying heat in the vicinity of the softening point or higher, and the concavo-convex pattern is copied on the surface by the principle of embossing.

  When the peelability of the base sheet 21 from the transparent layer 22 is good, the transparent layer 22 may be provided directly on the base sheet 21. In order to improve the peelability of the base sheet 21 from the transparent layer 22, a release layer (not shown) may be formed on the entire surface before the transparent layer 22 is provided on the base sheet 21. The release layer is removed from the transparent layer 22 together with the base sheet 21 when the base sheet 21 is peeled off after transfer. As the material of the release layer, melamine resin release agent, silicone resin release agent, fluororesin release agent, cellulose derivative release agent, urea resin release agent, polyolefin resin release agent, Paraffin-type release agents and composite release agents thereof can be used. As a method for forming the release layer, there are a coating method such as a roll coating method and a spray coating method, a printing method such as a gravure printing method and a screen printing method.

  The transparent layer 22 is entirely or partially formed on the base sheet 21 or the release layer. When the substrate sheet 21 is peeled off after the transfer, the transparent layer 22 becomes a transparent uneven layer 12 by copying the fine uneven shape of the substrate sheet 21. The material of the transparent layer 22 includes acrylic resin, polyester resin, polyvinyl chloride resin, cellulose resin, rubber resin, polyurethane resin, polyvinyl acetate resin, and vinyl chloride-vinyl acetate copolymer. Copolymers such as system resins and ethylene-vinyl acetate copolymer resins may be used. When hardness is required, a photocurable resin such as an ultraviolet curable resin, a radiation curable resin such as an electron beam curable resin, or a thermosetting resin may be selected and used. The transparent layer 22 may be colored or uncolored. Examples of the method for forming the transparent layer 22 include a coating method such as a gravure coating method, a roll coating method, and a comma coating method, a printing method such as a gravure printing method, and a screen printing method.

  Moreover, you may form a design layer (not shown) as needed. As a material of the pattern layer, a resin such as polyvinyl resin, polyamide resin, polyester resin, acrylic resin, polyurethane resin, polyvinyl acetal resin, polyester urethane resin, cellulose ester resin, alkyd resin is used as a binder. A colored ink containing a pigment or dye of an appropriate color as a colorant may be used. As a pattern layer forming method, a normal printing method such as a gravure printing method, a screen printing method, or an offset printing method may be used. In particular, the offset printing method and the gravure printing method are suitable for performing multicolor printing and gradation expression. In the case of a single color, a coating method such as a gravure coating method, a roll coating method, or a comma coating method may be employed.

  Moreover, you may form the contact bonding layer 23 as needed. As the adhesive layer 23, a heat-sensitive or pressure-sensitive resin suitable for the material of the base sheet 11 that is a transfer target is appropriately used. For example, when the material of the base sheet 11 is a polypropylene resin, a chlorinated polyolefin resin, a chlorinated ethylene-vinyl acetate copolymer resin, a cyclized rubber, or a coumarone indene resin may be used. Further, when the material of the base sheet 11 is an acrylic resin, an acrylic resin can be used. Examples of the method for forming the adhesive layer 23 include a coating method such as a gravure coating method, a roll coating method, and a comma coating method, and a printing method such as a gravure printing method and a screen printing method.

  Using the transfer material 20 having such a layer structure, the transparent uneven layer 12 is formed on the substrate sheet 11. For that purpose, first, the transparent layer 22 side of the transfer material 20 is brought into close contact with one side of the base material sheet 11.

  As the base sheet 11, a transparent sheet having three-dimensional processability is used. As a material for the base sheet 11, a resin sheet such as a polypropylene resin, a polyethylene resin, a polyamide resin, a polyester resin, an acrylic resin, or a polyvinyl chloride resin may be used.

  Next, using a transfer machine such as a roll transfer machine or an up-down transfer machine equipped with a heat-resistant rubber-like elastic body such as silicon rubber, a heat-resistant rubber-like condition set at a temperature of about 80 to 260 ° C. and a pressure of about 490 to 1960 Pa. Heat and pressure are applied from the substrate sheet 21 side of the transfer material 20 through the elastic body. By doing so, the transparent layer 22 side adheres to the surface of the base sheet 11. When the base sheet 21 is peeled off after cooling, peeling occurs between the base sheet 21 and the transparent layer 22 and transfer is completed. When a release layer is provided on the base sheet 21, when the base sheet 21 is peeled off, peeling occurs between the release layer and the transparent layer 22, and transfer is completed. In this way, the transparent uneven layer 12 can be formed on the base sheet 11.

  Next, the glitter layer 13 is formed on the transparent uneven layer 12 as necessary.

  The glitter layer 13 is composed of a metal thin film layer or a printed layer, and is a layer that expresses metallic luster and makes the unevenness of the transparent uneven layer 12 more clearly visible. The glitter layer 13 is formed by vacuum deposition, sputtering, ion plating, plating, or the like. Metals such as aluminum, nickel, gold, platinum, chromium, iron, copper, tin, indium, silver, titanium, lead, and zinc, and alloys or compounds thereof are used depending on the metallic luster color to be expressed. As an example of forming a partial metal thin film layer, a solvent-soluble resin layer is formed on a portion that does not require the metal thin film layer, and then a metal thin film is formed on the entire surface, followed by solvent cleaning. There is a method of removing an unnecessary metal thin film together with a solvent-soluble resin layer. The solvent often used in this case is water or an aqueous solution. As another example, there is a method in which a metal thin film is formed on the entire surface, a resist layer is then formed on a portion where the metal thin film is to be left, and etching is performed with acid or alkali to remove the resist layer. .

  Further, the glittering layer 13 can be formed using an ink using a metal powder such as aluminum as a pigment. As a method for forming the glitter layer 13 composed of the print layer, a normal printing method such as an offset printing method, a gravure printing method, a screen printing method, or the like may be used. When the glittering layer 13 made of ink is formed, the fine uneven shape of the transparent uneven layer 12 is filled.

  When providing the glitter layer 13, a front anchor layer or a rear anchor layer may be provided in order to improve adhesion with other layers. As materials for the front anchor layer and the rear anchor layer, two-component cured urethane resin, thermosetting urethane resin, melamine resin, cellulose ester resin, chlorine-containing rubber resin, chlorine-containing vinyl resin, acrylic resin, epoxy It is preferable to use a vinyl resin, a vinyl copolymer resin, or the like. Examples of methods for forming the front anchor layer and the rear anchor layer include coating methods such as gravure coating, roll coating, and comma coating, printing methods such as gravure printing, and screen printing.

  Next, an adhesive layer 14 is formed on the glitter layer 13 as necessary. The adhesive layer 14 adheres each of the above layers to the surface of the molded product that is decorated with the concavo-convex pattern decorative sheet 10. As the adhesive layer 14, a heat sensitive or pressure sensitive resin suitable for the material of the surface of the object to be decorated is appropriately used. For example, when the material of the surface of the object to be decorated is an acrylic resin, an acrylic resin may be used. In addition, when the material of the surface of the object to be decorated is polyphenylene oxide / polystyrene resin, polycarbonate resin, styrene copolymer resin, or polystyrene blend resin, acrylic resin or polystyrene resin having an affinity for these resins Polyamide resin or the like may be used. Furthermore, when the material of the surface of the object to be decorated is a polypropylene resin, a chlorinated polyolefin resin, a chlorinated ethylene-vinyl acetate copolymer resin, a cyclized rubber, or a coumarone indene resin can be used. Examples of the method for forming the adhesive layer 14 include a coating method such as a gravure coating method, a roll coating method, and a comma coating method, and a printing method such as a gravure printing method and a screen printing method.

In the concavo-convex pattern decorative sheet 10 that can be obtained in this manner, the transparent concavo-convex pattern is obtained after stretching in the longitudinal direction and the lateral direction to an elongation of 200% in a tensile test based on Japanese Industrial Standard (JIS) C2318 under an atmosphere of 110 ° C. It is preferable that the layer 12 has a fine uneven shape with an uneven width of 0.2 to 200 μm and a depth of 0.10 to 10 μm.

The tensile test based on JISC2318 is performed as follows. First, five test pieces each having a length of 200 mm and a width of 15 mm are sampled from the longitudinal direction and the transverse direction over the entire width, and a test mark is set at a distance of 50 mm at the center of the test piece. Using a shopper type pendulum type tensile tester or the like, the distance between the grips is set to about 100 mm, a test piece is attached to the grip, and the tensile elongation is measured at a speed of about 200 mm / min. When the distance between the test marks before the test is L ₀ and the distance between the test marks after the test is L, the elongation (%) is represented by ((L−L ₀ ) / L ₀ ) × 100.

  The reason why the atmosphere in which the tensile test is performed is 110 ° C. is that the uneven pattern decorative sheet 10 is three-dimensionally processed in a vacuum forming method that can be used as one of the three-dimensional processing methods of the uneven pattern decorative sheet 10 of the present invention. As a result of investigating a suitable temperature, most of the uneven pattern decorative sheet 10 was suitable for processing in the vicinity of 110 to 180 ° C., so the lowest value in the above temperature range was adopted. Processing at a temperature as low as possible has an advantage that thermal deterioration of each optical element such as an ink layer and a film constituting the uneven pattern decorating sheet 10 can be prevented.

  Further, in the tensile test, the elongation to 200% in each of the longitudinal direction and the transverse direction is the result of examining the tensile test at 110 ° C., and as a result, it is decorated with a concavo-convex pattern having mechanical properties that at least the elongation is 200% or more. This is because the sheet 10 can be processed into a three-dimensional shape deep enough to decorate the resin molded product.

  In addition, after the tensile test, the transparent uneven layer 12 has a fine uneven shape with an uneven width of 0.2 to 200 μm and a depth of 0.10 to 10 μm. If the uneven width is less than 0.2 μm, a transfer failure occurs in the transfer process for creating the uneven decorative sheet 10, and if the uneven width exceeds 200 μm, the sharpness as a fine pattern is lost in design. Further, if the uneven depth is less than 0.10 μm, the sharpness as a fine pattern is lost, and if the uneven depth exceeds 10 μm, a transfer failure occurs in the transfer process for creating the uneven patterned decorative sheet 10. .

  Moreover, it is preferable to make the transparent uneven | corrugated layer 12 have the fine uneven | corrugated shape of the uneven | corrugated width | variety of 0.15-150 micrometers and the depth of 0.15-15 micrometers before a tension test. When the transparent concavo-convex layer 12 is in the above range, it becomes easy to configure the transparent concavo-convex layer 12 to have a fine concavo-convex shape having a concavo-convex width of 0.2 to 200 μm and a depth of 0.10 to 10 μm after the tensile test. Because.

  In the present invention, the width of the unevenness means the average of the shortest distances between the vertices of the unevenness formed in the transparent uneven layer 12. Moreover, the depth of unevenness means the average distance from the deepest part of the unevenness | corrugation formed in many in the transparent uneven | corrugated layer 12 to the top part (refer FIG. 3).

  About the uneven | corrugated pattern decoration sheet 10 produced using the transfer material 20 so that it might become various values about the uneven | corrugated width and uneven | corrugated depth of the transparent uneven | corrugated layer 12, the tension test and the process to the uneven | corrugated pattern molded article 30 were performed. The results are shown in Tables 1 and 2.

  In the table, the evaluation of transferability is ○ when the transparent layer 22 is transferred 99% or more in area from the base sheet 21, 90% or more of the transparent layer 22 is less than 99% although there is a part not transferred. Δ when the image was transferred, and x when the transparent layer 22 was transferred less than 90% in many portions where the image was not transferred.

  In the tensile test, each transfer material 20 was stretched to an elongation of 200% in a tensile test based on JISC2318 in an atmosphere at a temperature of 110 ° C., and an average value of the width and depth of the unevenness was calculated.

  In addition, the evaluation of the fine concavo-convex pattern is ○ when the fine concavo-convex pattern is clearly expressed even after the molding process, △ when the presence of the fine concavo-convex pattern can be confirmed but is not clear, and part of the fine concavo-convex pattern When it disappeared or the sharpness of the fine concavo-convex pattern was lost, it was set as x.

  First, the concavo-convex width of the base sheet 21 of the transfer material 20 was fixed to 1.0 μm, and the concavo-convex depth of the base sheet 21 was set to various values to obtain the concavo-convex pattern decorative sheet 10 and the concavo-convex pattern molded product 30. (See Table 1).

  When the uneven depth of the base sheet 21 is less than 0.15 μm, the uneven depth of the transparent uneven layer 12 before the tensile test of the uneven patterned decorative sheet 10 is the same as the uneven depth formed on the base sheet 21. I was able to. However, after the tensile test of the concavo-convex pattern decorative sheet 10, the concavo-convex depth of the transparent concavo-convex layer 12 became less than 0.10 μm, and even in the concavo-convex pattern molded product 30, the fine concavo-convex pattern was not clear.

  When the concavo-convex depth of the base sheet 21 is 0.15 μm or more and 15.0 μm or less, the concavo-convex depth of the transparent concavo-convex layer 12 before the tensile test of the concavo-convex pattern decorative sheet 10 is the concavo-convex depth formed on the base sheet 21. The same value could be obtained. Further, after the tensile test of the concavo-convex pattern decorative sheet 10, the concavo-convex depth of the transparent concavo-convex layer 12 becomes 0.10 μm or more and 10.0 μm or less, and even in the concavo-convex pattern molded product 30, the fine concavo-convex pattern is clearly expressed and sufficient What had both scratch strength and profound feeling was obtained.

  When the uneven depth of the base sheet 21 exceeded 15.0 μm, there were many places where the transparent layer 22 was not transferred in the transfer step, and a clear fine uneven pattern could not be obtained.

  Next, the uneven depth of the base sheet 21 of the transfer material 20 is fixed to 1.0 μm, the uneven width of the base sheet 21 is set to various values, and various uneven pattern decorated sheets 10 and uneven pattern molded products 30 are set. (See Table 2).

  When the uneven | corrugated width | variety of the base sheet 21 was less than 0.15 micrometer, the location where the transparent layer 22 was not transcribe | transferred in the transfer process increased, and the clear fine uneven | corrugated pattern was not able to be obtained.

  When the uneven width of the base sheet 21 is 0.15 μm or more and 150.0 μm or less, the uneven width of the transparent uneven layer 12 before the tensile test of the uneven pattern decorative sheet 10 is the same value as the uneven width formed on the base sheet 21. Could get. In addition, after the tensile test of the concavo-convex pattern decorative sheet 10, the concavo-convex width of the transparent concavo-convex layer 12 becomes 0.20 μm or more and 200.0 μm or less, and the fine concavo-convex pattern is clearly expressed also in the concavo-convex pattern molded product 30, which is sufficiently scratched. What had both strength and profound feeling was obtained.

  When the uneven width of the base sheet 21 exceeds 150.0 μm, the uneven width of the transparent uneven layer 12 before the tensile test of the uneven pattern decorative sheet 10 can obtain the same value as the uneven width formed on the base sheet 21. It was. However, after the tensile test of the concavo-convex pattern decorative sheet 10, the concavo-convex width of the transparent concavo-convex layer 12 greatly exceeded 200.0 μm, and the fine concavo-convex pattern was not clear even in the concavo-convex pattern molded product 30.

An example of the method of obtaining the uneven | corrugated pattern molded article 30 using the uneven | corrugated pattern decorating sheet 10 obtained by this invention is demonstrated.

  First, the concavo-convex pattern decorative sheet 10 is set in an injection mold 31 (see FIG. 4).

  As a specific example of how to set the injection molding die 31, the long uneven decorative sheet 10 is temporarily wound around a roll shaft to form a roll-shaped scroll, and this roll-shaped scroll is used as a movable mold for injection molding. It is placed on the upper part of the movable mold so as to be movable integrally with the movable mold, and passes between the retracted movable mold and the stationary mold while unwinding the concavo-convex pattern decorative sheet 10 from the roll-shaped scroll, and is movable for injection molding. What is necessary is just to wind up the uneven | corrugated pattern decorating sheet 10 with the roll axis | shaft of the film winding means installed in the lower part of the type | mold so that a movement with the movable type | mold was possible. Moreover, you may set on the movable surface by a robot or a hand using the sheet | seat uneven | corrugated pattern decorating sheet 10. FIG. When the concave / convex pattern decorative sheet 10 is set on the movable surface, after the concave / convex pattern decorative sheet 10 is arranged on the movable surface, the position of the concave / convex pattern decorative sheet 10 relative to the movable surface is determined by a positioning sensor or the like. It is preferable to press the concavo-convex pattern decorative sheet 10 against the surface of a movable mold for injection molding with a clamp member or the like.

  Next, using the vacuum suction hole formed in the movable mold, the concave and convex pattern decorative sheet 10 is vacuum-sucked along the movable cavity forming surface, thereby along the movable recess or cavity forming surface. As shown in FIG. As a specific example, with a heating plate or the like inserted between the movable mold and the fixed mold, the uneven pattern decorative sheet 10 set on the surface of the movable mold is heated above its softening point to be softened, and the movable depression There is a method in which the space between the decorative sheet and the uneven pattern decorative sheet 10 is sealed, exhausted from the vacuum suction hole and vacuum-sucked, and the uneven pattern decorative sheet 10 is adhered to the inner surface of the movable recess.

  Instead of the above method, before setting the concavo-convex pattern decorative sheet 10 to the injection mold 31, the concavo-convex pattern decorative sheet 10 is formed using a three-dimensional processing mold different from the injection mold 31. Three-dimensional processing that matches the cavity forming surface of the injection mold 31 may be performed in advance, and punching into a desired shape may be performed. As a three-dimensional processing method, there are a vacuum forming method, a pressure forming method, a press forming method for pressing a heated rubber, a press forming method, and the like. Examples of the punching method include a Thomson punching method and a press method using a die 31. In addition, when performing a three-dimensional process, you may carry out a punching process simultaneously.

  Next, the injection molding die 31 is closed and the molten molding resin 32 is injected into the cavity from the gate portion of the fixed mold, and the molding resin 32 is solidified to form a resin molded product in the cavity. The adhesive layer 14 of the concavo-convex pattern decorative sheet 10 is integrally bonded to the surface (see FIG. 5).

  The molding resin 32 is not particularly limited. For example, an acrylic resin, a polystyrene resin, a polyacrylonitrile styrene resin, a polyacrylonitrile butadiene styrene resin, or the like can be used. Moreover, as a typical molding resin 32 used for interior parts and exterior parts of automobiles, there can be mentioned polypropylene resin containing talc, modified polypropylene resin and the like.

  Thereafter, the mold is opened, and the uneven pattern decorative sheet 10 is taken out together with the resin molded product, and unnecessary portions of the uneven pattern decorated sheet 10 adhered to the resin molded product are removed (see FIG. 6). In addition, when the concavo-convex pattern decorative sheet 10 is punched in advance, an operation of removing unnecessary portions of the concavo-convex pattern decorative sheet 10 becomes unnecessary. In this way, an uneven pattern molded product 30 can be obtained.

In the concavo-convex pattern molded product 30 decorated with the concavo-convex pattern decorative sheet 10 obtained by the present invention , the fine concavo-convex pattern of the transparent concavo-convex layer 12 is covered with the base sheet 11, so that the fine concavo-convex pattern is hardly damaged and heavy The feeling is excellent.

(Example 1) A base sheet having a fine concavo-convex shape of a hairline pattern having a concavo-convex width of 0.2 to 1.0 袖 m and a depth of 0.2 to 8.0 袖 m, obtained by subjecting a polyethylene terephthalate film having a thickness of 38 袖 m to abrasion processing with sandpaper. It was created. Next, a transparent layer made of an acrylic resin and an adhesive layer made of a vinyl chloride-vinyl acetate copolymer resin were formed on the uneven surface of the base sheet by a gravure printing method to obtain a transfer material.

  By using an acrylic film with a thickness of 125 μm as a base sheet and transferring the previously obtained transfer material thereon, a fine uneven shape with an uneven width of 0.2 to 1.0 μm and a depth of 0.2 to 8.0 μm The transparent uneven | corrugated layer which has was formed on the base material sheet. Next, a glittering layer made of an ink containing an aluminum paste in a resin binder of acrylic-vinyl copolymer resin / vinyl chloride-vinyl acetate copolymer system resin 1/1 on the transparent concavo-convex layer, vinyl chloride -The adhesion layer which consists of vinyl acetate copolymer type | system | group resin was each formed by the gravure printing method, and the uneven | corrugated pattern decorating sheet was obtained.

  About the uneven | corrugated pattern decorating sheet | seat obtained in this way, it extended | stretched to the elongation of 200% each in the vertical direction and the horizontal direction by the tension test based on JISC2318 in 110 degreeC atmosphere, and the width | variety and depth of the unevenness | corrugation of a transparent uneven | corrugated layer were made. When measured, the unevenness width was 0.3 to 1.4 μm and the depth was 0.15 to 7.0 μm.

(Reference example 1) After the concave / convex pattern decorative sheet obtained in Example 1 is formed into a desired three-dimensional shape by vacuum forming, it is injection-molded by heat-resistant ABS, and is an automobile part having a fine concave / convex shape of a hairline pattern. A certain concavo-convex decorative molded product was obtained. The surface of the concavo-convex pattern decorative molded product thus obtained had excellent design properties having both scratch strength and a heavy feeling.

Example 2 A base sheet having a fine concavo-convex shape of a hairline pattern having a concavo-convex width of 0.3 to 1.1 μm and a depth of 0.3 to 9.0 μm obtained by abrasion-processing a polyethylene terephthalate film having a thickness of 38 μm with sandpaper. It was created. Next, a transparent layer made of a two-component cured urethane resin and an adhesive layer made of a vinyl chloride-vinyl acetate copolymer resin are formed on the uneven surface of the base sheet by a gravure printing method to obtain a transfer material. It was.

  By using a polymer alloy film of polycarbonate and polybutylene terephthalate having a thickness of 100 μm as a base sheet and transferring the transfer material previously obtained thereon, an uneven width of 0.3 to 1.1 μm and a depth of 0.3 to A transparent uneven layer having a fine uneven shape of 9.0 μm was formed. Next, a glittering layer made of an aluminum thin film was formed on the transparent uneven layer, and then an adhesive layer made of vinyl chloride-vinyl acetate copolymer resin was formed by a gravure printing method to obtain an uneven pattern decorative sheet. .

  About the uneven | corrugated pattern decorating sheet | seat obtained in this way, it extended | stretched to the elongation of 200% each in the vertical direction and the horizontal direction by the tension test based on JISC2318 in 110 degreeC atmosphere, and the width | variety and depth of the unevenness | corrugation of a transparent uneven | corrugated layer were made. When measured, the unevenness width was 0.4 to 1.5 μm and the depth was 0.2 to 7.4 μm.

(Reference Example 2) A cellular phone part having a fine uneven shape of a hairline pattern after the uneven decorative sheet obtained in Example 2 is formed into a desired three-dimensional shape by vacuum forming and then injection-molded with heat-resistant ABS. An uneven pattern decorative molded product was obtained. The surface of the concavo-convex pattern decorative molded product thus obtained had both a scratch strength and a heavy feeling.

It is sectional drawing which shows one Example of the uneven | corrugated pattern decorating sheet obtained by this invention. It is sectional drawing which shows one Example of the transfer material used for the manufacturing method of the uneven | corrugated pattern decorating sheet of this invention. It is sectional drawing which shows the uneven | corrugated width and uneven | corrugated depth of the transparent uneven | corrugated layer of the uneven | corrugated pattern decorating sheet obtained by this invention. It is sectional drawing which shows the process of manufacturing an uneven | corrugated pattern molded article using the uneven | corrugated pattern decorating sheet obtained by this invention. It is sectional drawing which shows the process of manufacturing an uneven | corrugated pattern molded article using the uneven | corrugated pattern decorating sheet obtained by this invention. It is sectional drawing which shows one Example of the uneven | corrugated pattern molded article which can be obtained using the uneven | corrugated pattern decorating sheet obtained by this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Concave-pattern decoration sheet 11 Base material sheet 12 Transparent uneven | corrugated layer 13 Glossy layer 14 Adhesive layer 20 Transfer material 21 Base sheet 22 Transparent layer 23 Adhesive layer 30 Concave-pattern molded product 31 Mold 32 Molding resin

Claims (2)

  The transparent layer side of the transfer material provided with at least a transparent layer is adhered to the uneven surface of the substrate sheet having a fine uneven surface on a transparent substrate sheet having three-dimensional processability, and the substrate sheet is interposed between the transparent layer and the transparent layer. A method for producing a concavo-convex pattern decorative sheet, comprising forming a transparent concavo-convex layer by peeling and removing at step, and then obtaining a concavo-convex pattern decorative sheet by forming at least an adhesive layer on the transparent concavo-convex layer .   Adhering the transparent layer side of the transfer material provided with at least a transparent layer to the uneven surface of the substrate sheet having a fine uneven surface on a transparent substrate sheet having three-dimensional workability, the substrate sheet between the transparent layer A concave / convex pattern decoration is obtained by forming a transparent concave / convex layer by peeling and removing at step, and then obtaining a concave / convex pattern decorative sheet by forming at least a glitter layer and an adhesive layer on the transparent concave / convex layer Sheet manufacturing method.

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