JP2008120019A - Decoration method of resin molded article - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a decoration method of a resin molded article which can execute a pattern having concavo-convex having a suitable depth on the front surface of the resin molded article while the entire deformation of the resin molded article is suppressed. <P>SOLUTION: First, the resin molded article 2 is manufactured by forming a front layer 22 having a lower thermal deformation temperature than that of a base layer 21 on the front surface 21a of the base layer 21. Then, the front surface is decorated with the pattern on by heating the front surface 22a of the front layer 22, and then transferring the decorating roll while the decorating roll is pressed to the front surface 22a of the front layer 22, thereby transferring the rugged shape of the decorating roll to the front surface 22a of the front layer 22. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a decoration method for decorating a pattern by imparting an uneven shape to the surface of a resin molded product.

2. Description of the Related Art Conventionally, for example, a resin molded product used for a building material instead of wood is known in which a wood grain pattern is decorated on the surface. In order to decorate a grain pattern on the surface of the resin molded product in this way, as described in Patent Document 1, for example, the surface of the flat resin molded product is first heated and then applied to the heated surface. By rolling the decorating roll while pressing the decorating roll, there is a method of transferring the uneven shape applied to the surface of the decorating roll to the surface of the resin molded product and decorating the grain pattern on the surface.
Japanese Patent No. 3030009

  However, since the surface of the resin molded product is softened from the surface of the resin molded product to a certain depth by heating the surface of the resin molded product, for example, when the resin molded product is hollow, the decoration roll in that state If is pressed against the surface of the resin molded product, the resin molded product may be crushed. To prevent this, if the heating temperature when heating the surface of the resin molded product is set to be relatively low, the portion near the surface of the resin molded product is not sufficiently softened, and the surface of the resin molded product is not softened. The unevenness of the transferred wood grain pattern becomes shallow. Moreover, when the rib is provided in the hollow resin molded product, unevenness appears in the depth of the unevenness between the position where the rib is present and the position where the rib is not present.

  In view of such circumstances, the present invention provides a method for decorating a resin molded product capable of applying a pattern having irregularities of appropriate depth to the surface of the resin molded product while suppressing the overall deformation of the resin molded product. The purpose is to provide.

  In order to achieve the above-mentioned object, the present invention is a decoration method for decorating a pattern by imparting a concavo-convex shape to the surface of a resin molded product, which is more thermally deformed than the base layer on the surface of the base layer. A manufacturing process for producing a resin molded product by forming a surface layer having a low temperature, a heating process for heating the surface of the surface layer, and a surface of the surface layer heated by a decorative roll having a pattern formed on the surface in an uneven shape And a transfer step of transferring the concavo-convex shape onto the surface of the surface layer and decorating the surface with a pattern by rolling the surface over the surface.

  Here, the heat deformation temperature refers to a temperature that exhibits a predetermined deformation when a base layer or a surface layer composed of a single layer is placed under a constant load and the temperature is increased at a constant speed.

  According to this configuration, the resin molded product is composed of a base layer and a surface layer having a lower thermal deformation temperature than the base layer, and the surface of the surface layer is transferred before transferring the uneven shape of the decorating roll to the surface of the surface layer. By heating, it becomes possible to sufficiently soften only the surface layer by utilizing the difference in heat deformation temperature between the surface layer and the base layer. And by pressing a decorating roll on the surface of the surface layer in this state, a deep uneven pattern can be applied to the surface of the surface layer while suppressing deformation of the base layer. That is, according to the present invention, it is possible to provide a pattern having irregularities with an appropriate depth on the surface of the resin molded product while suppressing the overall deformation of the resin molded product.

  In the decoration method of the resin molded product, in the heating step, the surface temperature of the surface layer is equal to or higher than the thermal deformation temperature of the surface layer, and the temperature of the boundary surface between the base layer and the surface layer is equal to or lower than the thermal deformation temperature of the base layer. It is preferable to heat the surface of the surface layer so that

  In this way, it is possible to sufficiently soften only the surface layer while suppressing softening of the base layer.

  The pattern is preferably a wood grain pattern.

  In this way, a good wood texture can be obtained by deep irregularities.

  In the manufacturing process, it is preferable to form the surface layer with a material containing a foaming agent.

  In this way, when the surface of the surface layer is heated in the heating step, the foaming agent contained in the surface layer foams and the surface of the surface layer becomes rough, so that the gloss of the surface disappears and the wood texture is improved. Become.

  In the transfer step, it is preferable to roll the decorative roll while pressing the decorative roll against the surface of the surface layer while keeping the surface temperature of the decorative roll at a predetermined temperature.

  Thus, the glossiness of the surface of the surface layer can be controlled by maintaining the surface temperature of the decorating roll at a predetermined temperature. For example, if the surface temperature of the decorating roll is kept relatively low, the surface of the surface layer will be pressed while the surface gloss has disappeared, so the surface can be made dull. If the surface temperature of the decorating roll is kept relatively high, the surface of the surface layer is pressed while being softened again by the decorating roller, so that the surface can be made glossy.

  Further, it is preferable that a finer stripe pattern than the wood grain pattern is further applied to the surface of the surface layer after the transfer step.

  In this way, the wood texture can be further improved by the fine streaks.

  Moreover, it is preferable to grind and roughen the surface of the surface layer before the heating step.

  In this way, a bark feel can be obtained.

  As described above, according to the present invention, it is possible to provide a pattern having irregularities with an appropriate depth on the surface of a resin molded product while suppressing the overall deformation of the resin molded product.

  Hereinafter, the best mode for carrying out the present invention will be described in detail with reference to the drawings.

  The method for decorating a resin molded product according to an embodiment of the present invention includes a manufacturing process, a heating process, and a transfer process.

  The manufacturing process is performed by the manufacturing apparatus 1 shown in FIG. This manufacturing apparatus 1 manufactures a resin molded product 2 as shown in FIG. 2A and performs a process of cutting the resin molded product 2 with a desired length in one line. A molding table 12, a take-up machine 13, and a cutting machine 14 are provided.

  The resin molded product 2 is a plate-like extrusion molded product extending in a specific direction with a predetermined cross-sectional shape. Specifically, the resin molded product 2 includes a base layer 21 configured to be hollow by connecting the left and right ends of the ceiling wall 21b and the bottom wall 21c with side walls 21d, and a surface 21a of the base layer 21. Specifically, in FIG. 2A, it is composed of the entire upper surface of the ceiling wall 21b, the outer surface of the right side wall 21d, and the surface layer 22 formed on the outer surface of the left side wall 21d. In addition, a plurality of ribs 21e arranged at regular intervals in the width direction of the resin molded product 2 are provided inside the base layer 21, and the strength of the base layer 21 is ensured. In the present embodiment, the surface layer 22 is formed on three of the four surfaces constituting the surface 21a of the base layer 21, but the surface layer 22 is formed on all four surfaces of the surface 21a. Alternatively, it may be formed only on one surface.

  Examples of the material constituting the base layer 21 include styrene resins such as polystyrene (PS), HIPS, ABS resin, AES resin and ASA resin; olefin resins such as polyethylene (PE) and polypropylene (PP); polyvinyl chloride (PVC); Polyester resins such as polyethylene terephthalate (PET) and polylactic acid (PLA); acrylic resins; resins such as polycarbonate. Or what added fillers, such as wood flour and talc, to these resin is also employable.

  Examples of the material constituting the surface layer 22 include styrene resins such as polystyrene (PS), HIPS, ABS resin, AES resin and ASA resin; olefin resins such as polyethylene (PE) and polypropylene (PP); polyvinyl chloride ( PVC); polyester resins such as polyethylene terephthalate (PET) and polylactic acid (PLA); acrylic resins; resins such as polycarbonate. In addition, it is preferable that these resins have weather resistance. Or what added fillers, such as wood flour and talc, to these resin is also employable. Furthermore, it is more preferable to employ a resin obtained by adding a foaming agent to these resins.

  The amount of the foaming agent added is preferably such that the expansion ratio is in the range of 1.1 to 3.0. If the expansion ratio is less than 1.1, the improvement of the wood texture due to foaming of the foaming agent is not so much seen. If the expansion ratio is greater than 3.0, the surface layer 22 becomes too soft and is not suitable as a building material. is there.

  Examples of the foaming agent include inorganic foaming agents such as sodium bicarbonate, sodium carbonate, ammonium bicarbonate, ammonium carbonate, and ammonium nitrite; N, N′-dimethyl-N, N′-dinitroso terephthalamide, N, N′— Nitroso compounds such as dinitroso, pentamethylene, tetramine; azo compounds such as azodicarbonamide, azodicarboxamide, azobisisobutyronitrile, azocyclohexylnitrile, azodiaminobenzene, barium azodicarboxylate; benzenesulfonyl hydrazide, toluene Sulfonyl hydrazide compounds such as sulfonyl hydrazide, P, P′-oxybis (benzenesulfonyl hydrazide), diphenylsulfone-3,3′-disulfonyl hydrazide; calcium azide, 4,4′-diphenyl disulfide Niruajido, may be mentioned an azide compound such as p- toluenesulfonyl azide. Of these, nitroso compounds, azo compounds and azide compounds are preferably used. Moreover, you may use a foaming adjuvant together with a foaming agent as needed. The foaming assistant is an additive that functions to lower the decomposition temperature of the foaming agent, promote decomposition, and make the bubbles uniform. Examples of the foaming aid include organic acids such as salicylic acid, phthalic acid and stearic acid; urea and derivatives thereof.

  Further, the thickness of the surface layer 22, that is, the distance from the surface 21 a of the base layer 21 to the surface 22 a of the surface layer 22 is 0.5 mm or more larger than the depth of the unevenness of the wood grain pattern to be decorated on the surface 22 a of the surface layer 22. It is preferable to set to. Specifically, when the depth of the target unevenness is 0.5 mm or more, the thickness of the surface layer 22 is preferably set within a range of 1 to 5 mm.

  First, the manufacturing apparatus 1 uses the twin-screw extruder 11 to extrude the base layer 21 with the above-described material, and the surface layer 22 having a predetermined thickness with the above-described material on the surface 21 a of the extruded base layer 21. The resin molded product 2 is manufactured. Next, the manufacturing apparatus 1 cools the resin molded product 2 by the molding table 12 and cures the base layer 21 and the surface layer 22, then takes the resin molded product 2 by the take-up machine 13, and finally forms the resin by the cutting machine 14. Product 2 is cut to the desired length. And the resin molded product 2 cut | disconnected in this way is used for the said heating process and the said transfer process.

  The heating step and the transfer step are performed by an embossing machine 3 shown in FIG. The embossing machine 3 performs the transfer step after the heating step in the process in which the resin molded product 2 is conveyed from the left side to the right side in FIG. 3 with the surface 22a of the surface layer 22 facing upward. The heating means 31 for performing the heating process and the transfer means 36 for performing the transfer process are provided.

  The heating means 31 is composed of a ceramic heater that heats the surface 22 a of the surface layer 22. More specifically, in the heating means 31, the temperature of the surface 22a of the surface layer 22 is equal to or higher than the heat deformation temperature of the surface layer 22, and the temperature of the boundary surface between the base layer 21 and the surface layer 22 is equal to or lower than the heat deformation temperature of the base layer 21. The surface 22a of the surface layer 22 is heated so that it becomes. A more preferable heating condition is that the temperature of the surface 22 a of the surface layer 22 is equal to or higher than the temperature obtained by adding 20 ° C. to the heat distortion temperature of the surface layer 22. Further, the temperature of the boundary surface between the base layer 21 and the surface layer 22 may be equal to or lower than the temperature obtained by adding 20 ° C. to the thermal deformation temperature of the base layer 21. In addition to the ceramic heater, a hot air heater or an infrared heater can be used as the heating means 31.

  As shown in FIG. 4, the transfer unit 36 includes a decorating roll 32 and a smoothing roll 33 that sandwich the resin molded product 2 whose surface 22 a of the surface layer 22 is heated by the heating unit 31 from above and below with a predetermined pressure. ing.

  The decorating roll 32 and the smooth roll 33 are rotatably supported by a support means (not shown). When the resin molded product 2 is inserted between the rolls 32 and 33 from the left side and pulled out to the right side, the surface layer 22 of the resin molded product 2 is pressed by the decorating roll 32 from above and the base layer 21. Pass between them while being pressed by the smooth roll 33 from below. In other words, the decoration roll 32 rolls on the surface 22 a while being pressed against the surface 22 a of the surface layer 22. Note that the decoration roll 32 may be configured to rotate counterclockwise in FIG. 3 by a driving unit such as a motor, and the resin molded product 2 may be sent to the right side by the rotation of the decoration roll 32.

  Moreover, the grain pattern is given to the surface of the decorating roll 32 by the uneven | corrugated shape 32a (refer FIG. 4). For this reason, when the decorating roll 32 rolls on the surface 22a while being pressed against the surface 22a of the surface layer 22, the uneven shape 32a of the decorating roll 32 is transferred to the surface 22a of the surface layer 22, and FIG. The wood grain pattern 23 as shown in b) is applied.

  Furthermore, the surface temperature of the decorating roll 32 is maintained at a predetermined temperature by a temperature adjusting means (not shown). For this reason, the transfer is performed in a state in which the surface temperature of the decorating roll 32 is kept at a predetermined temperature.

  Further, on the downstream side of the transfer means 36 in the transport direction of the resin molded product 2, a decorative roll 34 and a smooth roll 35 are provided for sandwiching the resin molded product 2 after the transfer process from above and below. . On the surface of the decorative roll 34, a finer stripe pattern than the grain pattern of the decorative roll 32 is provided in an uneven shape. That is, the uneven shape on the surface of the decorative roll 34 is narrower in pitch and shallower than the uneven shape 32 a on the surface of the decorative roll 32. Then, when the resin molded product 22 passes between these rolls 34, 35, a finer stripe pattern than the wood grain pattern 23 is further applied to the surface 22 a of the surface layer 22.

  The embossing machine 3 configured in this manner first heats the surface 22a of the surface layer 22 of the resin molded product 2 with the heating means 31 as described above, and then the surface temperature of the decorating roll 32 with a predetermined temperature by the transfer means 36. The grain pattern of the decorating roll 32 is transferred to the surface 22a of the surface layer 22 in a state of being kept in the state, and finally a streak pattern is further formed on the surface 22a of the surface layer 22 to which the grain pattern 23 is applied by the decorating roll 34 and the smooth roll 35. Apply.

  As described above, in the method for decorating a resin molded product according to the present embodiment, the resin molded product 2 is composed of the base layer 21 and the surface layer 22 having a lower thermal deformation temperature than the base layer 21, and the decorating roll 32. Before the uneven shape 32a of the surface layer 22 is transferred to the surface 22a of the surface layer 22, the temperature of the surface 22a of the surface layer 22 becomes equal to or higher than the thermal deformation temperature of the surface layer 22, and the temperature of the boundary surface between the base layer 21 and the surface layer 22 is By heating the surface 22a of the surface layer 22 so as to be equal to or lower than the heat deformation temperature of the base layer 21, only the surface layer 22 is sufficiently suppressed while suppressing softening of the base layer 21 by utilizing the difference in heat deformation temperature between the surface layer 22 and the base layer 21. Can be softened. Then, by pressing the decorating roll 32 against the surface 22a of the surface layer 22 in this state, it is possible to apply a deep uneven wood grain pattern 23 to the surface 22a of the surface layer 22 while suppressing deformation of the base layer 21. That is, according to the method for decorating a resin molded product of the present embodiment, a grain pattern having an appropriate depth of unevenness is applied to the surface of the resin molded product 2 while suppressing the overall deformation of the resin molded product 2. Will be able to.

  Further, when a material containing a foaming agent is used as a material constituting the surface layer 22 when the resin molded product 2 is manufactured, foaming included in the surface layer 22 is heated when the surface 22a of the surface layer 22 is heated. Since the agent foams and the surface 22a of the surface layer 22 becomes rough, the luster of the surface 22a disappears and the wood texture is improved.

  Furthermore, in the decoration method of the resin molded product of this embodiment, after the uneven | corrugated shape 32a of the decorating roll 32 is transcribe | transferred to the surface 22a of the said surface layer 22, and the grain pattern 23 is decorated, it is finer than the grain pattern 23. Since a fine stripe pattern is further applied, the wood texture can be further improved by the fine stripe pattern.

  Moreover, since the surface temperature of the decorating roll 32 is maintained at a predetermined temperature, the gloss state of the surface 22a of the surface layer 22 can be controlled thereby. For example, if the surface temperature of the decorating roll 32 is kept relatively low, the surface 22a of the surface layer 22 is pushed with the surface 22a remaining in a glossy state. On the contrary, if the surface temperature of the decorating roll 32 is kept relatively high, the surface 22a of the surface layer 22 is pressed while being softened again by the decorating roller 32, so that the glossy surface 22a It can be.

  Further, the surface 22a of the surface layer 22 may be ground and roughened before the surface 22a of the surface layer 22 is heated. For this grinding, for example, a wire brush, a flap wheel, a belt sander or the like can be used. In this way, a bark feel can be obtained by the rough surface 22a.

<Example>
First, the molded products A to F having the configurations shown in Table 1 below were manufactured as the resin molded products 2 and the comparative examples having the configurations shown in Table 1 below were manufactured. In addition, the unit of the numerical value of the column of resin, a filler, a coloring agent, a plasticizer, and a foaming agent in a table | surface is a mass part.

  The molded products A to C are obtained by forming the surface layer 22 with a material containing a foaming agent, and the molded product F is obtained by making the surface layer 22 soft. Further, the molded product B 'is obtained by increasing the thickness of the surface layer 22 and increasing the amount of the foaming agent relative to the molded product B. The hardness of the surface layer 22 of the molded product F is 80 HDA. The heat deformation temperature in the table is a temperature measured by ASTM D-648, and both ends of a test piece comprising the base layer 21 or the surface layer 22 as a single layer are supported in an oil bath, and the test piece is loaded with a load rod. This is the temperature at which the bending stress of 1.82 MPa is applied to the test piece by pushing the center of the nozzle, the temperature of the oil bath is raised at 2 ° C./min, and the deflection of the test piece at the load point reaches 0.254 mm. .

<Example 1>
In Example 1, as shown in Table 2 below, the heating process and the transfer process are performed on the molded product A under conditions 1 to 3 and the comparative example is also subjected to the heating process and transfer under the conditions in the table. The process was performed. In addition, the glossiness in the column of evaluation in the table is a value measured using a handy gloss meter (gross chucker) IG-320 manufactured by Horiba, Ltd.

  Under condition 1, in the heating step, the surface 22a of the surface layer 22 was heated so that the temperature of the surface 22a of the surface layer 22 was 110 ° C., which is 25 ° C. higher than the thermal deformation temperature of the surface layer 22. In this way, the maximum depth of the grain pattern irregularities applied to the surface 22a of the surface layer 22 was 0.5 mm. Moreover, as a result of setting the surface temperature of the decorating roll 32 to 20 ° C., the glossy surface 22 a having a glossiness of 3.0 was obtained.

  In condition 2, the heating temperature in the heating step was set to 180 ° C. In this way, the maximum depth of the grain pattern irregularities applied to the surface 22a of the surface layer 22 was 0.8 mm. Further, as a result of setting the surface temperature of the decorating roll 32 to 170 ° C., the glossiness of the surface 22a was increased to 6.0, and not only the surface 22a was glossy but also the glossiness was increased.

  In Condition 3, the heating temperature in the heating step was set to a relatively high value of 240 ° C. In this way, foaming of the foaming agent contained in the surface layer 22 is promoted, and the surface 22a of the surface layer 22 is more roughened, so that the surface 22a after the transfer process can have a rough feeling, and further the wood Improved texture. The glossiness of the surface 22a at this time was 1.5.

  On the other hand, in the comparative example, the heat deformation temperature of the surface layer is the same as the heat deformation temperature of the base layer and is high. Therefore, even if the pressing force of the decorating roll is set large, the surface of the surface layer is about 0.2 mm. Only the grain pattern with the unevenness of depth could be given.

<Example 2>
In Example 2, as shown in Table 3 below, the heating step and the transfer step are performed on the molded product B under conditions 1 to 3, and the molded product B ′ is also heated under the conditions in the table. And a transfer step. In conditions 2 and 3, the surface 22a of the surface layer 22 was ground and roughened by a belt sander before the heating step.

  In condition 1, as a result of setting the surface temperature of the decorating roll 32 to 90 ° C. and about halfway between the condition 1 and the condition 2 of Example 1, the glossiness of the surface 22a of the surface layer 22 becomes 5.0, which is lower than the surface 22a. We were able to put out the glossiness.

  Under condition 2, a streak appears on the surface 22a of the surface layer 22 after the transfer process due to the grinding performed before the heating process, and a bark feel can be obtained.

  In condition 3, the surface temperature of the decorating roll 32 was set to 120 ° C., and the pressing force of the decorating roll 32 was set small. As a result, it was possible to give glossiness only to the valleys while maintaining the maximum depth of the grain pattern irregularities applied to the surface 22a of the surface layer 22 at a relatively good level of 0.5 mm.

  In the molded product B ′, by using the decorating roll 32 having a concavo-convex shape with a maximum depth of 3.0 mm, the maximum depth of the concavo-convex pattern of the wood grain pattern applied to the surface 22a of the surface layer 22 is 2.8 mm. became.

<Example 3>
In Example 3, as shown in Table 4 below, the heating process and the transfer process were performed on the molded products C to F under the conditions in the table.

  As can be seen from Table 4, a deep uneven grain pattern 23 could be applied to the surface 22a of the surface layer 22 also for the molded products C to F. In addition, about the molded products D-F, since the foaming agent was not contained in the material which comprises the surface layer 22, the measurement of the glossiness was abbreviate | omitted.

  In the said embodiment, although the base layer 21 of the resin molded product 2 is hollow, the base layer 21 may be solid.

  Moreover, in the said embodiment, although the resin molded product 2 is extrusion-molded with the biaxial extruder 11, the base layer 21 and the surface layer 22 were formed in the resin molded product 2 with the other shaping | molding method. It may be a thing. For example, after the base layer 21 is formed by molding, the resin molded product 2 may be molded by applying and curing a resin constituting the surface layer 22 on the surface 21a of the base layer 21 in a molten state.

  Moreover, in the said embodiment, although the embossing machine 3 and the manufacturing apparatus 1 are made independent, the embossing machine 3 is installed between the take-up machine 13 and the cutting machine 14 of the manufacturing apparatus 1, and a heating process and a transcription | transfer process are carried out. It can also be done online.

  Furthermore, the pattern to be decorated on the surface 22a of the surface layer 22 of the resin molded product 2 is not limited to the grain pattern 23 but may be other patterns. However, when decorating the wood grain pattern 23 on the surface 22a of the surface layer 22, a good wood texture can be obtained due to deep unevenness.

It is a schematic diagram of the manufacturing apparatus which performs the manufacturing process in the decoration method of the resin molded product which concerns on one Embodiment of this invention. (A) is a perspective view of the resin molded product before a heating process, (b) is a perspective view of the resin molded product after a transfer process. It is a schematic diagram of the embossing machine which performs the heating process and transfer process in the said decoration method. It is sectional drawing of the resin molded product at the time of a transcription | transfer process being performed by the said embossing machine.

Explanation of symbols

2 resin molded product 21 base layer 21a surface 22 surface layer 22a surface 23 wood grain pattern 3 embossing machine 31 heating means 32 decorating roll 32a uneven shape 34 decorating roll

Claims (7)

It is a decoration method for decorating a pattern by imparting an uneven shape to the surface of a resin molded product,
A production process for producing a resin molded product by forming a surface layer having a lower thermal deformation temperature than the base layer on the surface of the base layer;
A heating step of heating the surface of the surface layer;
The surface of the surface layer is rolled onto the surface by rolling a decorative roll having a pattern on the surface while pressing the decorative roll onto the surface of the heated surface layer, thereby decorating the pattern on the surface. And a transfer step for performing a decoration method for a resin molded product.   In the heating step, the surface of the surface layer is heated so that the surface temperature of the surface layer is equal to or higher than the heat deformation temperature of the surface layer, and the temperature of the boundary surface between the base layer and the surface layer is equal to or lower than the heat deformation temperature of the base layer. The decoration method of the resin molded product of Claim 1 characterized by the above-mentioned.   The method for decorating a resin molded product according to claim 1 or 2, wherein the pattern is a wood grain pattern.   In the said manufacturing process, a surface layer is formed with the material containing a foaming agent, The decoration method of the resin molded product of Claim 3 characterized by the above-mentioned.   5. The resin molding according to claim 4, wherein in the transfer step, the decorative roll is rolled on the surface while pressing the decorative roll against the surface of the surface layer while maintaining the surface temperature of the decorative roll at a predetermined temperature. How to decorate goods.   The method for decorating a resin molded product according to any one of claims 3 to 5, wherein a streak pattern finer than the grain pattern is further applied to the surface of the surface layer after the transfer step.   The method for decorating a resin molded product according to any one of claims 3 to 6, wherein the surface of the surface layer is ground and roughened before the heating step.

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