Transfer sheet and method for manufacturing molded product

Abstract

To provide a transfer sheet which is less susceptible to peeling defects by adjusting a peeling force of a release layer of the transfer sheet, and a molded product using the transfer sheet.SOLUTION: A molded product 10 is a flat plate, and has an injection molded body 11 and an adhesive layer 54 formed on the injection molded body 11, and a release layer 53 formed on a surface of the adhesive layer 54 on which the injection molded body 11 is not formed. The molded product 10 is formed by transferring the adhesive layer 54 and the release layer 53 onto the injection molded body 11 by in-mold molding using a transfer sheet 50. The release layer contains a thermosetting resin and a thermoplastic resin, and a ratio of the thermosetting resin to the thermoplastic resin is 2:1 to 6:1.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a method for producing a transfer sheet and a molded product, and more particularly to a method for producing a transfer sheet and a molded product using a transfer sheet that is less susceptible to peeling defects. [Background technology]

[0002] Conventionally, molded products have been manufactured by in-mold molding, in which a transfer sheet is transferred to an injection molded body in an injection mold. Such molded products are used for the interior of automobiles, the exterior of electrical appliances, and the cover panels of displays. For example, Patent Document 1 describes a molding method that is less likely to cause foil burrs during in-mold molding using a transfer sheet. In Patent Document 1, a dummy part is formed by injection molding with a gap between the product part and the product part, and the product part and the dummy part are configured so that the resins of the product part and the dummy part are not connected to each other. Foil burrs are likely to occur at the boundary between the transfer area and the non-transfer area, but the product part and the dummy part are connected by the transfer layer of the transfer sheet, and there is no boundary between the transfer area and the non-transfer area around the product part, so foil burrs are less likely to occur. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 2020-163585 Summary of the Invention [Problem to be solved by the invention]

[0004] In the conventional manufacturing method of a molded product as described above, a step of cutting out the dummy portion from the product portion after molding is required, which may reduce productivity.

[0005] This invention has been made to solve the above-mentioned problems, and aims to provide a transfer sheet that is less likely to have peeling problems by adjusting the peeling force of the release layer of the transfer sheet, and a molded product using such a transfer sheet. [Means for solving the problem]

[0006] In order to achieve the above object, the first invention is a transfer sheet comprising a base sheet, a release layer formed on the base sheet, and a peeling layer formed on the release layer, the release layer containing a thermosetting resin and a thermoplastic resin, and the ratio of the thermosetting resin to the thermoplastic resin is 2:1 to 6:1.

[0007] With this configuration, the release layer has a good balance between the releasability due to the thermosetting resin and the adhesiveness due to the thermoplastic resin, resulting in a transfer sheet that is less likely to cause burrs and leaves little traces after peeling.

[0008] A second invention is a transfer sheet according to the first invention, wherein the thermosetting resin is a melamine resin, and the thermoplastic resin is a mixture of a urethane resin and a xylene resin.

[0009] When configured in this manner, the urethane resin has high flexibility, and the xylene resin acts as a compatibilizer between the melamine resin and the urethane resin, forming a uniform release layer. Therefore, when this transfer sheet is used for injection molding, the product has excellent crack resistance and impact resistance, and uneven product characteristics are suppressed.

[0010] A third invention is the transfer sheet according to the second invention, wherein the ratio of the urethane resin to the xylene resin is 20:1 to 5:2.

[0011] In this configuration, when the xylene resin is more than urethane resin:xylene resin=20:1, good adhesion is obtained, so that foil burrs are unlikely to occur. Also, when the xylene resin is less than urethane resin:xylene resin=5:2, good flexibility is obtained, so that cracks are unlikely to occur.

[0012] A fourth invention is the transfer sheet according to the second or third invention, wherein the urethane resin has a glass transition temperature of -80°C to 0°C.

[0013] With this configuration, the glass transition temperature of the urethane resin is sufficiently lower than room temperature, and the peel strength is unlikely to change depending on the temperature, so that moldability is likely to be stable.

[0014] A fifth invention is a transfer sheet according to the second or third invention, wherein the release layer further contains p-toluenesulfonic acid as a catalyst.

[0015] In this manner, the p-toluenesulfonic acid promotes the polymerization of low molecular weight melamine, resulting in good releasability derived from the high molecular weight melamine resin, and making it difficult for peeling marks to remain.

[0016] A sixth invention is the transfer sheet according to the second or third invention, wherein the release layer has a thickness of 0.16 μm to 0.22 μm.

[0017] By configuring it in this way, a transfer sheet can be obtained that is highly effective in suppressing foil burrs and peeling marks.

[0018] A seventh invention is a method for manufacturing a molded product, comprising the steps of: preparing a transfer sheet comprising a base sheet, a release layer formed on the base sheet, and a peeling layer formed on the release layer, the release layer containing a thermosetting resin and a thermoplastic resin, the ratio of the thermosetting resin to the thermoplastic resin being 2:1 to 6:1; placing the transfer sheet on a cavity surface of a first mold of an injection molding mold having a first mold and a second mold that forms a cavity between the first mold and the second mold by clamping; clamping the injection molding mold; injecting molten resin into the cavity to mold an injection molded product and simultaneously transferring the peeling layer to the surface of the injection molded product; and opening the injection molding mold, peeling the base sheet of the transfer sheet together with the release layer from the molded product, and removing the injection molded product.

[0019] With this configuration, the release layer has a good balance between the releasability of the thermosetting resin and the adhesiveness of the thermoplastic resin, resulting in a molded product that is less likely to develop burrs and that is less likely to leave traces after peeling. Effect of the Invention

[0020] According to the present invention, it is possible to obtain a transfer sheet which is less prone to peeling defects, and a molded product using the transfer sheet. [Brief description of the drawings]

[0021] [Figure 1] FIG. 1 is a schematic cross-sectional view of a molded product according to a first embodiment of the present invention. [Diagram 2] 1 is a schematic cross-sectional view of a transfer sheet according to a first embodiment of the present invention. [Diagram 3] 1A to 1C are schematic cross-sectional views illustrating a manufacturing process of a molded product according to a first embodiment of the present invention. [Figure 4] FIG. 4 is a schematic cross-sectional view of a molded product according to a second embodiment of the present invention. [Diagram 5] FIG. 4 is a schematic cross-sectional view of a transfer sheet according to a second embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0022] A molded article 10 according to a first embodiment of the present invention will be described with reference to the drawings.

[0023] 1, molded article 10 according to the first embodiment of the present invention is a flat plate-like shape, and includes injection molded body 11, adhesive layer 54 formed on injection molded body 11, and release layer 53 formed on the surface of adhesive layer 54 on which injection molded body 11 is not formed. Molded article 10 is formed by in-mold molding using transfer sheet 50, in which adhesive layer 54 and release layer 53 are transferred onto injection molded body 11.

[0024] 2, the transfer sheet 50 includes a base sheet 51, a release layer 52 formed on the base sheet 51, a peeling layer 53 formed on the release layer 52, and an adhesive layer 54 formed on the peeling layer 53. The molded product 10 is applied to, for example, a cover panel of a display, an interior of an automobile, or an exterior of an electric appliance.

[0025] The injection molded body 11 is, for example, a general-purpose resin such as polystyrene resin, polyolefin resin, ABS resin, AS resin, or AN resin, a general-purpose engineering resin such as polycarbonate resin, acrylic resin, or thermoplastic polyurethane, or a super engineering resin such as polyimide resin or liquid crystal polyester resin. A composite resin containing a reinforcing material such as glass fiber or inorganic filler can also be used. The thickness of the molded resin body 11 is not particularly limited and is selected according to the thickness of the housing of the product to be manufactured.

[0026] The base sheet 51 supports the release layer 52, the peeling layer 53, and the adhesive layer 54. For example, the base sheet 51 may be a thermoplastic resin such as polypropylene resin, polyethylene resin, polyamide resin, acrylic resin, olefin resin, epoxy resin, polyimide resin, thermoplastic polyurethane, silicone resin, polyester resin, vinyl chloride resin, polycarbonate resin, ABS resin, or a laminate thereof. The thickness of the base sheet 40 is preferably, for example, 12 μm to 200 μm. If the thickness of the base sheet 51 is 12 μm or more, the base sheet 51 has a thickness that is excellent in handleability, and if the thickness is 200 μm or less, the base sheet 51 has a suitable rigidity and therefore has good flexibility.

[0027] The release layer 52 is a layer that is peeled off together with the base sheet 51 during in-mold transfer. The release layer 52 contains both a thermosetting resin and a thermoplastic resin. In addition to the thermosetting resin and the thermoplastic resin, additives such as a stabilizer and a catalyst may be contained. The thickness of the release layer 52 is preferably, for example, 0.1 μm to 0.5 μm. If the thickness is 0.1 μm or more, the layer can be stably applied onto the base sheet, and good releasability can be obtained. If the thickness is 0.5 μm or less, the thickness of the release layer is less likely to be uneven, and the releasability is more likely to be stable.

[0028] The thermosetting resin is a material that can mainly impart releasability to the release layer 52, and examples of the material that can be used include melamine resin, urea resin, epoxy resin, and urethane resin. In particular, melamine resin is preferable, and has good releasability when used in the transfer sheet 50. Examples of the melamine resin that can be used include butyl group type melamine, ethyl group type melamine, methyl group type melamine, imino group type melamine, mixed imino group and ethyl group type melamine, butyrol group type melamine, ethylol group type melamine, and methylol group type melamine.

[0029] An acid catalyst may be used together with the thermosetting resin. When forming the release layer 52 on the base sheet 51, for example, various materials including a thermosetting resin are diluted with an organic solvent, and applied to the base sheet 51, followed by drying and curing. At that time, by using an acid catalyst together, the polymerization of the low molecular weight material that becomes a thermosetting resin after polymerization, which is contained together with the thermosetting resin in the material diluted with the organic solvent, is promoted, and good releasability derived from the high molecular weight thermosetting resin is obtained. In addition, when a melamine resin is used as the thermosetting resin, it is preferable to use p-toluenesulfonic acid as the acid catalyst. By using p-toluenesulfonic acid as the acid catalyst, the polymerization of low molecular weight melamine is promoted particularly efficiently.

[0030] The thermoplastic resin is a resin that mainly imparts adhesiveness to the release layer 52, and for example, urethane resin or acrylic resin can be used as the base resin, and xylene resin, petroleum resin, terpene resin, rosin, etc. can be used as the tackifier. Moreover, one or more of these materials may be used.

[0031] It is more preferable to use a mixture of melamine resin as the thermosetting resin and urethane resin and xylene resin as the thermoplastic resin as the material of the release layer 52. Melamine resin has good releasability when used in the transfer sheet 50. Urethane resin has high flexibility as well as adhesiveness, so it has excellent crack resistance and impact resistance when injection molding is performed using the transfer sheet 50. Xylene resin not only provides adhesion, but also acts as a compatibilizer for the melamine resin and the urethane resin, so it plays a role in easily forming the release layer 52 into a uniform film and suppressing unevenness in product characteristics.

[0032] The urethane resin may be a urethane resin obtained by polymerizing a polyol resin and an isocyanate. For example, the polyol resin may be a polyester polyol or a polyether polyol, which are generally used in adhesive applications. For example, the isocyanate may be a diisocyanate compound such as tolylene diisocyanate, xylylene diisocyanate, phenylene diisocyanate, biphenylmethane diisocyanate, hexamethylene diisocyanate, tetramethylene diisocyanate, dimethoxybiphenylene diisocyanate, naphthalene diisocyanate, dimethylbiphenylene diisocyanate, diphenylene diisocyanate, diisocyanate diphenyl ether, xylylene diisocyanate, diisocyanate methylcyclohexane, diisocyanate dicyclohexane, diisocyanate cyclohexylmethane, or isophorone diisocyanate. The glass transition temperature of the urethane resin is preferably -80°C to 0°C, more preferably -60°C to -30°C. If the glass transition temperature of the urethane resin is within this range, it is sufficiently lower than room temperature, and the release force is unlikely to change due to temperature, so that moldability tends to be stable. As the xylene resin, for example, an unmodified xylene resin crosslinked with a methylene bond or an ether bond can be used.

[0033] The ratio of thermosetting resin to thermoplastic resin is 2:1 to 6:1 to form the release layer 52. With this configuration, the balance between the releasability of the thermosetting resin and the adhesiveness of the thermoplastic resin is good, resulting in a transfer sheet that is less likely to cause burrs and leaves little traces after peeling.

[0034] When a mixture of urethane resin and xylene resin is used as the thermoplastic resin, the ratio of urethane resin to xylene resin is preferably 20:1 to 5:2. When the xylene resin is more than 20:1 (urethane resin:xylene resin), good adhesion is exhibited, so that burrs are unlikely to occur. When the xylene resin is less than 5:2 (urethane resin:xylene resin), good flexibility derived from the urethane resin is sufficiently obtained, so that cracks are unlikely to occur during molding.

[0035] The release layer 53 is a layer that becomes the outermost surface of the molded product 10 by being peeled off at the interface between the release layer 52 and the release layer 53 during in-mold molding. The release layer 53 may function as a layer having hard coat properties and chemical resistance in order to protect the molded product 10. The material of the release layer 53 may be, for example, a thermoplastic resin such as an acrylic resin, a polystyrene resin, a polyamide resin, a chlorinated polyolefin resin, a chlorinated ethylene-vinyl acetate copolymer resin, a cyclized rubber, or a coumarone-indene resin. In addition, the release layer 53 may be formed by including any of a photocurable resin such as an ultraviolet curable resin, a radiation curable resin such as an electron beam curable resin, or a thermosetting resin. Examples of such resins include urethane acrylate resins, cyanoacrylate resins, epoxy acrylate resins, polyester acrylate resins, and resins obtained by adding additives such as isocyanate to these resins.

[0036] The adhesive layer 54 is a layer for bonding the transfer sheet 50 and the injection molded body 11. For example, an acrylic resin, a urethane resin, a polyester resin, a polyvinyl acetate resin, a vinyl chloride resin, or a vinyl chloride-vinyl acetate copolymer can be used. The thickness of the adhesive layer 54 can be, for example, 2 to 20 μm.

[0037] Next, an outline of a method for producing the molded product 10 according to the first embodiment of the present invention will be described with reference to the drawings.

[0038] Referring to FIG. 3(a), a transfer sheet 50 is prepared. The transfer sheet 50 includes a base sheet 51, a release layer 52 formed on the base sheet 51, a peeling layer 53 formed on the release layer 52, and an adhesive layer 54 formed on the peeling layer 53. The transfer sheet 50 is placed in an injection mold 80. The injection mold 80 includes a first mold 81 and a second mold 82. The first mold 81 has a cavity surface 83 corresponding to the shape of the molded product 10, and the second mold 82 has an injection port 84 for injecting molten resin. In addition, a space is formed between the first mold 81 and the second mold 82 by clamping the first mold 81 and the second mold 82. This space is called a cavity 87. In the process of placing the transfer sheet 50 in the injection mold 80, the transfer sheet 50 passes over the guide roller 85 from above the first mold 81, is placed between the first mold 81 and the second mold 82 so that the base sheet 51 faces the cavity surface 83 of the first mold 81, and passes under the guide roller 86 of the first mold 81. Next, referring to FIG. 3(b), the transfer sheet 50 is three-dimensionally molded according to the shape of the cavity surface 83 of the first mold 81 by sucking from the first mold 81 side by a suction mechanism (not shown). Next, referring to FIG. 3(c), the first mold 81 and the second mold 82 are clamped. Next, molten resin is injected from the injection port 84 of the second mold 82 to mold the injection molded body 11, and at the same time, the surface of the injection molded body 11 on the first mold 81 side and the adhesive layer 54 of the transfer sheet 50 are fixed. Next, referring to Figure 3 (d), the injection molding die 80 is opened, and the portion of the transfer sheet 50 that is adhered to the injection molded body 11 is released at the interface between the release layer 52 and the peeling layer 53, while removing the molded article 10 in which the adhesive layer 54 and the peeling layer 53 are adhered to the injection molded body 11, thereby producing the molded article 10.

[0039] The transfer sheet 50 used in the above manufacturing method is configured so that the release layer 52 contains a thermosetting resin and a thermoplastic resin, and the ratio of the thermosetting resin to the thermoplastic resin is 2: 1 to 6: 1. If the ratio of the thermosetting resin to the thermoplastic resin is within the above range, the balance between the releasability derived from the thermosetting resin of the release layer 52 and the adhesiveness derived from the thermoplastic resin is good, and when the base sheet 51 and the release layer 52 are peeled off after injection molding or transfer, burrs are unlikely to occur and peeling marks are unlikely to remain.

[0040] Next, the action and effect when the thermosetting resin and the thermoplastic resin are used in the release layer 52 in a ratio of 2:1 to 6:1 will be described. The thermosetting resin was melamine resin, and the thermoplastic resin was a mixture of urethane resin and xylene resin. In addition, p-toluenesulfonic acid was used as a catalyst together with the melamine resin. With reference to Tables 1 and 2, the transfer sheet 50 was produced using the release layer 52 of Examples 1 to 10 and Comparative Examples 1 to 5, and it was examined whether or not foil burrs and peeling marks were generated by insert molding using the transfer sheet 50. The amounts of the melamine resin, urethane resin, xylene resin, and catalyst in Tables 1 and 2 represent the weight ratios of each. In addition, the ratio of the thermosetting resin and the thermoplastic resin, the amount of the melamine resin, the amount of the urethane resin, the amount of the xylene resin, and the film thickness of the release layer 52 are described in terms of the solid content in a state in which the release layer 52 is applied to the base sheet 51 and dried. In addition, melamine resin, which is the most preferable thermosetting resin, and a mixture of urethane resin and xylene resin, which is the most preferable thermoplastic resin, are used, but the materials are not limited to these and other materials can be used. In addition, in the examples and comparative examples shown in Table 1, acrylic resin A is mainly used for the release layer, and the thickness of the release layer is 3 μm. In the examples and comparative examples shown in Table 2, acrylic resin B, which is different from acrylic resin A, is mainly used for the release layer, and the thickness of the release layer is 5 μm.

[0041] In Tables 1 and 2, the foil burr resistance is marked with ◎, which indicates that the foil burr suppression effect is very high. The foil burr resistance is marked with ○, which indicates that the foil burr suppression effect is high. The foil burr resistance is marked with ×, which indicates that the foil burr occurs at a level that has a large impact on the production yield. The peeling trace resistance is marked with ◎, which indicates that the peeling trace suppression effect is very high. The peeling trace resistance is marked with ○, which indicates that the peeling trace suppression effect is high. The peeling trace resistance is marked with ×, which indicates that the peeling trace occurs. In Examples 1 to 10, both the foil burr resistance and the peeling trace resistance are marked with ◎ or ○, and it can be seen that the ratio of the thermosetting resin to the thermoplastic resin is within the optimal range. On the other hand, in Comparative Example 1 and Comparative Example 4, the ratio of the thermosetting resin to the thermoplastic resin, the thermosetting resin / thermoplastic resin, is 7.85, but foil burrs occurred after insert molding. In Comparative Example 2, Comparative Example 3, and Comparative Example 5, the thermosetting resin / thermoplastic resin is 1.01, but peeling traces were observed after insert molding. The foil burr refers to a layer transferred to a transfer area of ​​a molded product remaining as a burr in a non-transfer area. The peeling trace refers to a transfer defect trace remaining on the molded product 10, in which a part of the peeling layer 53 remains on the base sheet side when the base sheet 51 is peeled off together with the release layer 52. From the above, it was found that the optimum range for the thermosetting resin / thermoplastic resin is 2.00 to 6.00, i.e., the ratio of thermosetting resin to thermoplastic resin is 2:1 to 6:1, as shown in Examples 1 to 10. Also, from Experimental Examples 3 to 5, 8, and 9, it was found that when the thermosetting resin / thermoplastic resin is in the range of 2.00 to 6.00 and the film thickness of the release layer is 0.16 μm to 0.22 μm, the effect of suppressing foil burrs and the effect of suppressing peeling marks are very high, and this is a more preferable range.

[0042] [Table 1]

[0043] [Table 2]

[0044] Next, a molded product 20 according to a second embodiment of the present invention will be described, focusing on the differences from the molded product 10 according to the first embodiment.

[0045] Referring to Figure 4, the molded product 20 is similar in that an adhesive layer 64 and a peel-off layer 63 are formed on an injection-molded body 21, but differs from the molded product 10 of the first embodiment in that it further has a decorative layer 65 between the adhesive layer 64 and the peel-off layer 63.

[0046] The molded product 20 is produced by in-mold molding using a transfer sheet 60, in which an adhesive layer 64, a decorative layer 65, and a release layer 63 are transferred onto an injection molded body 21.

[0047] Referring to Figure 5, the transfer sheet 60 comprises a base sheet 61, a release layer 62 formed on the base sheet 51, a peeling layer 63 formed on the release layer 62, a decorative layer 65 formed on the peeling layer 63, and an adhesive layer 64 formed on the decorative layer 65.

[0048] The decorative layer 65 is a layer for decorating the molded product 20. The decorative layer 65 is formed, for example, by gravure ink. The gravure ink contains a binder resin, a solvent, and a colorant. Examples of the binder resin include vinyl chloride vinyl acetate copolymer resin, acrylic resin, polyester resin, and polyurethane resin. The solvent is for dissolving the resin and is selected according to the resin. Examples of the solvent for the gravure ink include toluene, methyl ethyl ketone, ethyl acetate, and isopropyl alcohol. The decorative layer 65 is formed, for example, on the entire surface of the molded product 20. Note that the decoration is not limited to the use of imparting color to the molded product, and may also include imparting a function. The imparting of a function includes, for example, an anti-reflection function and an anti-glare function.

[0049] The materials of the other layers and the method of manufacturing the molded article 20 are the same as those of the molded article 10 according to the first embodiment.

[0050] Although the molded products according to the above embodiments are flat plate-like, they may have any shape that can be formed by injection molding, and may also have a three-dimensional shape.

[0051] Furthermore, in the molded product according to the second embodiment described above, the decorative layer is formed over the entire surface of the molded product, but as long as the molded product is decorated with the decorative layer, the decorative layer may be formed only on a portion of the molded product, for example, on only the outer periphery of the molded product.

[0052] Furthermore, in the molded article according to each of the above embodiments, the configuration in which the release layer is the outermost surface has been described, but the outermost surface of the molded article is not limited to the release layer, and other layers may be provided. For example, after a molded article in which the release layer is the outermost surface is manufactured by insert molding, other layers can be formed on the release layer. Examples of other layers include a hard coat layer.

[0053] Furthermore, in the manufacturing methods of molded products according to each of the above embodiments, an injection molding die having an injection outlet in the second die is used, but as long as molten resin can be injected from the injection outlet into the cavity of the injection molding die, the injection outlet may be located in either the first die or the second die. [Explanation of symbols]

[0054] 10 Molded products 11 Injection molded body 20 Molded products 21 Injection molded body 50 Transfer Sheet 51 Base sheet 52 Release layer 53 Peeling layer 54 Adhesive layer 60 Transfer Sheet 61 Base sheet 62 Release layer 63 Peeling layer 64 Adhesive layer 80 Injection Mould 81 First Mold 82 2nd Mold 83 Cavity surface 87 Cavity

Claims

1. A base sheet; A release layer formed on the base sheet; a peeling layer formed on the release layer, The release layer contains a thermosetting resin and a thermoplastic resin, A transfer sheet, wherein the ratio of the thermosetting resin to the thermoplastic resin is 2:1 to 6:

1.

2. The thermosetting resin is a melamine resin, The transfer sheet according to claim 1 , wherein the thermoplastic resin is a mixture of a urethane resin and a xylene resin.

3. 3. The transfer sheet according to claim 2, wherein a ratio of the urethane resin to the xylene resin is from 20:1 to 5:

2.

4. 4. The transfer sheet according to claim 2, wherein the urethane resin has a glass transition temperature of -80°C to 0°C.

5. The transfer sheet according to claim 2 or 3, wherein the release layer further contains p-toluenesulfonic acid as a catalyst.

6. 4. The transfer sheet according to claim 2, wherein the release layer has a thickness of 0.16 μm to 0.22 μm.

7. preparing a transfer sheet comprising a base sheet, a release layer formed on the base sheet, and a peeling layer formed on the release layer, the release layer including a thermosetting resin and a thermoplastic resin, the ratio of the thermosetting resin to the thermoplastic resin being 2:1 to 6:1; A step of placing the transfer sheet on a cavity surface of a first mold of an injection molding die having a first mold and a second mold that forms a cavity between the first mold and a second mold by clamping; clamping the injection mold; a step of injecting a molten resin into the cavity to form an injection molded body, and at the same time, transferring the release layer onto a surface of the injection molded body; opening the injection molding die and peeling the base sheet of the transfer sheet together with the release layer from the molded article to remove the injection molded article.

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