JP4850778B2 - Decorative sheets, molded articles and transport equipment - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To fully improve weatherability of a decorative sheet to be adhered to the surface of a matter to be decorated under being extended and also to prevent a crack from developing in the adhesion. <P>SOLUTION: The decorative sheet which is adhered under extending to the surface of a matter to be decorated comprises a substrate 1 with two of primary surfaces 1a and 1b which are opposited each other, a protective layer 2 formed on the side of the primary surface 1a on one side of the substrate 1 and a colored layer 3 containing a pigment formed on the other side of the primary surface 1b of the substrate 1 or between the substrate 1 and the protective layer 2. The protective layer 2 has a thickness of more than 30 &mu;m and less than 60 &mu;m and contains a UV absorber of more than 1.4 wt.% and less than 4.0 wt.%. The colored layer 3 has thickness more than 15 &mu;m and less than 80 &mu;m and contains a UV absorber of more than 1.0 wt.% and less than 4.0 wt.%. <P>COPYRIGHT: (C)2008,JPO&amp;INPIT

Description

  The present invention relates to a decorative sheet that is attached to a surface of an article to be decorated while being stretched. The present invention also relates to a molded article or a transport device that is decorated with such a decorative sheet.

  Various molded products are used for exterior parts of transportation equipment such as automobiles. Conventionally, a painting technique has been used as a technique for decorating a molded product. Painted exterior parts are required to have excellent weather resistance and scratch resistance so that they can withstand long-term use outdoors.

  As a technique for imparting sufficient weather resistance and scratch resistance to exterior parts, a top coat technique is known in the field of automobile painting. By coating acrylic resin, fluororesin, etc. on the outermost surface of the painted exterior parts, weather resistance and scratch resistance are improved.

  On the other hand, in recent years, as a technique for decorating a molded product, a technique of attaching a decorative sheet to the surface of the molded product as disclosed in Patent Document 1 has been proposed.

  An example of the decorative sheet is shown in FIG. A decoration sheet 110 shown in FIG. 9 has a base material 1 formed from a resin material and a decoration layer 2 formed by printing ink or the like on the main surface 1a of the base material 1. The decorative sheet 110 provided with the adhesive 8 on the decorative layer 2 is attached to the surface of the molded article main body 121 as shown in FIGS. A molded product 120 is obtained.

  A molded article 121 shown in FIG. 10A has a hemispherical (ridge-shaped) convex portion 121a, and has an uneven surface. Therefore, the decorative sheet 110 is stretched so as to follow the undulations when being attached. In order that the decorative sheet 110 can be suitably stretched, the decorative sheet 110 is heated and softened before being pasted.

  When a decorative sheet is used, it is easier to recycle the molded product than coating with a paint. In addition, since the aesthetics different from painting can be brought out, the decorativeness can be improved. Thus, the method using the decorative sheet is very useful.

  When a decorative sheet is used for decoration of an exterior part, there is a possibility that the ink of the decorative layer is deteriorated by ultraviolet rays contained in sunlight. Therefore, it is necessary to improve the weather resistance of the decorative sheet.

  Patent Document 2 discloses a resin laminate excellent in weather resistance. FIG. 11 schematically shows the resin laminate 210.

  As shown in FIG. 11, the resin laminate 210 cures a base material 211 made of polycarbonate, an acrylic resin layer 212 containing an ultraviolet absorber, and a coating agent in which a plurality of components are blended in a specific composition ratio. The cured layer 213 formed in such a manner is laminated.

In this resin laminate 210, since ultraviolet rays are absorbed by the ultraviolet absorber contained in the acrylic resin layer 212, high weather resistance is obtained.
JP 2005-153351 A JP 2004-250581 A

  However, according to the study of the present inventor, the resin laminate 210 as disclosed in Patent Document 2 is used as a decorative sheet, and is applied to a molded product by a technique as disclosed in Patent Document 1. However, in practice, it was found difficult to obtain sufficient weather resistance. This is due to the fact that the decorative sheet is stretched and thinned during pasting. When the acrylic resin layer 212 becomes thin, the amount of the ultraviolet absorber contained per unit area of the decorative sheet is reduced, so that the ultraviolet rays cannot be sufficiently absorbed and the weather resistance is lowered.

  In addition, it is conceivable that the entire sheet is formed thick in advance in anticipation of the decorative sheet being stretched. However, the decorative sheet is not necessarily stretched uniformly when being attached to a molded product. The extent to which the sheet is stretched varies from part to part of the decorative sheet. For this reason, if the entire sheet is formed thick, the portion where a sufficient thickness is originally secured is excessively thick, which causes a significant cost increase.

  Although it is conceivable that only the acrylic resin layer 212 containing the ultraviolet absorber is formed thick, the acrylic resin layer 212 is less likely to be stretched than the base material 211 formed of polycarbonate, and thus the thick acrylic resin layer 212 is formed. May crack when stretched.

  The present invention has been made in view of the above problems, and its purpose is to sufficiently improve the weather resistance of a decorative sheet that is pasted while being stretched on the surface of the article to be decorated. It is to prevent the occurrence of cracks.

  A decorative sheet according to the present invention is a decorative sheet that is pasted while being stretched on the surface of an article to be decorated, and includes a base material having first and second main surfaces facing each other, and the first of the base materials. A protective layer provided on the main surface side of 1 and a colored layer containing a pigment provided on the second main surface side of the base material or between the base material and the protective layer. The layer has a thickness of 30 μm or more and 60 μm or less and includes an ultraviolet absorber of 1.4% by weight or more and 4.0% by weight or less, and the colored layer has a thickness of 15 μm or more and 80 μm or less. And 1.0 wt% or more and 4.0 wt% or less of an ultraviolet absorber.

  In a preferred embodiment, the substrate has a thickness of 300 μm or more and 800 μm or less.

  In a preferred embodiment, the protective layer has a pencil hardness at room temperature higher than that of the substrate.

  The molded product according to the present invention includes a molded product main body and a decorative sheet having the above-described configuration attached to the surface of the molded product main body.

  In a preferred embodiment, the decorative sheet is attached to the back surface of the molded product body so as to be wound at an end of the molded product body.

  In a preferred embodiment, the decorative sheet includes a portion having a thickness of 30% to 50% with respect to the thickness of the thickest portion.

  The transport apparatus according to the present invention includes a molded product having the above-described configuration.

  In the decorative sheet according to the present invention, since the ultraviolet absorber is contained in both the protective layer and the colored layer (that is, not only in the protective layer but also in the colored layer), high weather resistance is easily obtained.

  In the decorative sheet according to the present invention, the protective layer further has a thickness of 30 μm or more and 60 μm or less, and contains an ultraviolet absorber of 1.4% by weight or more and 4.0% by weight or less. Has a thickness of 15 μm or more and 80 μm or less, and contains 1.0 wt% or more and 4.0 wt% or less of an ultraviolet absorber. Thus, since both the thickness of the protective layer and the colored layer and the content of the ultraviolet absorber are set within a specific range, it is sufficient even if it is applied to the surface of the article to be decorated while being stretched. Excellent weather resistance can be ensured, and cracking can be prevented.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In addition, this invention is not limited to the following embodiment.

  FIG. 1 schematically shows a decorative sheet 10 according to the present embodiment. The decorative sheet 10 is a sheet that is pasted while being stretched on the surface of the article to be decorated.

  As shown in FIG. 1, the decorative sheet 10 includes a base material 1 having two main surfaces 1a and 1b facing each other, a protective layer 2 provided on one main surface 1a side of the base material 1, and a base And a colored layer 3 provided on the other main surface 1b side of the material 1.

  The base material 1 is formed from a resin material, and is typically formed from a thermoplastic resin such as polycarbonate or vinyl chloride resin. Since the base material 1 is required to have rigidity as a sheet base material, it is preferable to select a material in consideration of this point. The thickness of the substrate 1 is preferably 300 μm or more and 800 μm or less. If the thickness of the substrate 1 is less than 300 μm, it may be difficult to handle as a sheet, or the strength may be insufficient, and the substrate 1 may be torn. Moreover, when the thickness of the base material 1 exceeds 800 μm, the followability to the surface of the article to be decorated may be deteriorated.

  The protective layer 2 is formed from a resin material. From the viewpoint of sufficiently increasing the scratch resistance of the decorative sheet 10, the protective layer 2 preferably has a pencil hardness at room temperature higher than that of the substrate 1. Specifically, an acrylic resin or a vinyl chloride resin can be used as the resin material for forming the protective layer 2. For example, an acrylic resin containing 80 mol% or more of a repeating unit derived from a methyl methacrylate monomer and having a weight average molecular weight of about 70,000 to 150,000 can be suitably used. As the base material 1 provided with such a protective layer 2, for example, acrylic co-extruded polycarbonate DO-2 manufactured by Mitsubishi Gas Chemical Co., Inc. can be used.

  The colored layer 3 contains a pigment and is colored thereby. The colored layer 3 can be formed, for example, by printing ink in which a pigment is added to a binder resin. As the binder resin, for example, an acrylic resin, a urethane resin, or an acrylic urethane resin can be used.

  The protective layer 2 and the colored layer 3 each contain an ultraviolet absorber. A well-known thing can be used as a ultraviolet absorber. As an ultraviolet absorber contained in the protective layer 2, for example, Tinuvin 1577FF manufactured by Ciba Specialty Chemicals can be used. Moreover, as the ultraviolet absorber contained in the colored layer 3, for example, Tinuvin 328 and Tinuvin 571 manufactured by Ciba Specialty Chemicals can be used.

  As the ultraviolet absorber contained in the colored layer 3, one that is solid at room temperature (for example, the above-mentioned Tinuvin 328) may be used, or one that is liquid at room temperature (for example, the above-mentioned Tinuvin 571) may be used. . When a liquid ultraviolet absorber is used, the colored layer 3 is more easily stretched than when a solid ultraviolet absorber is used, so that the colored layer 3 is not easily cracked. However, as will be described later, when a liquid ultraviolet absorber is used, the ultraviolet absorber may ooze out of the colored layer 3 depending on the thickness of the colored layer 3.

  When the decorative sheet 10 is affixed to a molded product, an adhesive 8 is applied on the colored layer 3 as indicated by a broken line in FIG. As the adhesive, a urethane or acrylic adhesive can be suitably used.

  The decorative sheet 10 having the above-described configuration can be used in a molding method as disclosed in Patent Document 1, and is suitably used for decoration of a molded product having a large undulation on the surface.

  In the decorative sheet 10 according to the present embodiment, since both the protective layer 2 and the colored layer 3 (that is, not only the protective layer 2 but also the colored layer 3) contain an ultraviolet absorber, high weather resistance is obtained. Cheap. Hereinafter, this reason will be described more specifically.

  In order to prevent the ultraviolet rays from reaching the colored layer 3, it is considered that a large amount of an ultraviolet absorber may be simply added to the protective layer 2 only. However, it is actually very difficult to absorb all the ultraviolet rays (included in sunlight) irradiated on the decorative sheet 10 only with the protective layer 2. Therefore, a part of ultraviolet rays irradiated to the decorative sheet 10 attached to the article to be decorated passes through the protective layer 2 and reaches the base material 1 and the colored layer 3, and then the decorative sheet 10 and The reflection is repeated at the interface with the article to be decorated, the interface between the substrate 1 and the colored layer 3, the interface between the substrate 1 and the protective layer 2, and the like. Therefore, a part of the ultraviolet light that has once transmitted through the colored layer 3 can reach the colored layer 3 again.

  When the ultraviolet absorber is contained only in the protective layer 2, the ultraviolet rays once transmitted through the protective layer 2 are not absorbed by the ultraviolet absorber as long as reflection is repeated at the above-described interface. Therefore, the colored layer 3 is deteriorated by ultraviolet rays.

  On the other hand, when the ultraviolet absorber is contained in both the protective layer 2 and the colored layer 3 as in the present embodiment, the ultraviolet light transmitted through the protective layer 2 is absorbed by the ultraviolet absorber of the colored layer 3. Therefore, deterioration of the colored layer 3 due to ultraviolet rays can be suppressed, and as a result, the weather resistance is greatly improved.

  In addition, when the decorative sheet 10 is pasted while being stretched on the article to be decorated, the thickness of the decorative sheet 10 may vary, and a part of the protective layer 2 may become thin. Thus, when the protective layer 2 is locally thin or the amount of the ultraviolet absorber contained in the protective layer 2 is small, a considerable amount of ultraviolet rays can pass through the protective layer 2. However, since the ultraviolet absorber is contained not only in the protective layer 2 but also in the colored layer 3 as in the present embodiment, sufficient weather resistance is ensured even when a considerable amount of ultraviolet rays can pass through the protective layer 2. be able to.

  In the decorative sheet 10 according to the present embodiment, the thickness and the content of the ultraviolet absorber are set within a specific range for both the protective layer 2 and the colored layer 3. Even if it is applied to the surface of the product while being stretched, cracks do not occur, and sufficient weather resistance can be ensured.

  Specifically, the protective layer 2 preferably has a thickness of 30 μm or more and 60 μm or less and includes an ultraviolet absorber of 1.4% by weight or more and 4.0% by weight or less. The colored layer 3 preferably has a thickness of 15 μm or more and 80 μm or less, and contains 1.0% by weight or more and 4.0% by weight or less of an ultraviolet absorber. Hereinafter, the reason why the above numerical range is preferable will be described.

  First, in Table 1, after preparing a plurality of decorative sheets 10 having different thicknesses of the protective layer 2 and the colored layer 3, and extending them to a predetermined thickness, weather resistance, cracking of the protective layer 2, The result of having evaluated the crack of the colored layer 3 and the bleeding of the ultraviolet absorber contained in the colored layer 3 is shown. In addition, about the thickness of the base material 1, the protective layer 2, and the colored layer 3, both the numerical values before and after the stretching are shown, and the evaluation results are “◯”, “Δ”, “×” with some exceptions. "Is shown in three stages. The weather resistance was evaluated using a sunshine weatherometer in accordance with JIS B7753. The case where ΔE (color difference) of 3 or less and the initial glossiness of 50% or more can be maintained for 600 hours or more “◯”, the case where it is 400 hours or more and less than 600 hours is indicated by “Δ”, and the case where it is less than 400 hours is indicated by “x”. In addition, the evaluation of bleeding of the ultraviolet absorber is performed when the decorative sheet 10 after being stretched is heated to 80 ° C. (when the decorative sheet 10 is used for decoration of the exterior of a motorcycle, it is up to about 80 ° C. by irradiation with sunlight. This was done by observing the appearance of the case (because it is assumed to be heated).

  As can be seen from the results for the case where the thickness of the protective layer 2 is 80 μm (# 5), when the thickness of the protective layer 2 exceeds 60 μm, the protective layer 2 is cracked. In the case where the thickness of the protective layer 2 is 20 μm (# 1), there was no problem with weather resistance, cracking, and bleeding, but the overall evaluation result is indicated by “▲” instead of “◯”. This is because, when the protective layer 2 is thin (specifically, when the thickness is less than 30 μm), the thickness of the protective layer 2 tends to vary greatly during the production of the decorative sheet 10, making it difficult to produce a uniform sheet. That's why. Variations in the thickness of the protective layer 2 cause variations in weather resistance.

  Further, as can be seen from the results when the thickness of the colored layer 3 is 90 μm (# 9) or 100 μm (# 10), if the thickness of the colored layer 3 exceeds 80 μm, the cracking of the colored layer 3 occurs. There has occurred. When the thickness of the colored layer 3 was 10 μm (# 6), there was no problem with weather resistance, cracking, and bleeding, but the overall evaluation result was indicated by “▲” instead of “◯”. This is because if the colored layer 3 is thin (specifically, if the thickness is less than 15 μm), the thickness of the colored layer 3 tends to vary greatly during the production of the decorative sheet 10 and color unevenness occurs. is there.

  On the other hand, when the thickness of the protective layer 2 is not less than 30 μm and not more than 60 μm and the thickness of the colored layer 3 is not less than 15 μm and not more than 80 μm (# 2, # 3, # 4, # 7 and # 8), The problem of cracking and bleeding did not occur, and variations in the thickness of the protective layer 2 and the colored layer 3 during sheet preparation were small. Thus, the thickness of the protective layer 2 is preferably 30 μm or more and 60 μm or less, and the thickness of the colored layer 3 is preferably 15 μm or more and 80 μm or less.

  Subsequently, in Tables 2, 3 and 4, the thickness of the base material 1 is set to 300 μm, 500 μm and 800 μm, respectively, the thickness of the protective layer 2 and the ultraviolet absorber content, and the thickness of the colored layer 3 The evaluation result when changing thickness and ultraviolet absorber content is shown.

  In Table 2, Table 3 and Table 4, when the thickness of the substrate 1 is different (for example, comparison between # 11, # 24 and # 33, comparison between # 19, # 28 and # 37) As can be seen from the above, even if the thickness of the substrate 1 is different, the same evaluation is performed as long as the thickness of the protective layer 2 and the ultraviolet absorber content, the thickness of the colored layer 3 and the ultraviolet absorber content are the same. Results were obtained. This is because, in the range of the thickness of the base material 1 exemplified, weather resistance and resistance to cracking (that is, formability) do not depend on the thickness of the base material 1, and the thickness of the protective layer 2 and This means that it depends on the ultraviolet absorber content, the thickness of the colored layer 3 and the ultraviolet absorber content.

  The thickness of the protective layer 2 and the thickness of the colored layer 3 are 30 μm and 15 μm, which are preferable lower limits, respectively, the ultraviolet absorber content of the protective layer 2 is 1.4% by weight, and the ultraviolet absorber content of the colored layer 3 When the content was 1.0% by weight (# 18 in Table 2), sufficient weather resistance was obtained. On the other hand, when the thickness of the protective layer 2 and the thickness of the colored layer 3 are 30 μm and 15 μm, respectively, and the UV absorber contents of the protective layer 2 and the colored layer 3 are 1.0% by weight, respectively (in the table) The weather resistance was not sufficient. In addition, when one of the protective layer 2 and the colored layer 3 did not contain an ultraviolet absorber (# 14, # 15, # 16 and # 17), the weather resistance was insufficient.

  Further, the thickness of the protective layer 2 and the thickness of the colored layer 3 are 60 μm and 80 μm, which are preferable upper limits, respectively, the ultraviolet absorber content of the protective layer 2 is 4.0% by weight, and the ultraviolet absorber of the colored layer 3 When the content was 4.0% by weight (# 19 in Table 2), the protective layer 2 and the colored layer 3 were not cracked, and good moldability was obtained. On the other hand, when the thickness of the protective layer 2 was 60 μm and the UV absorber content of the protective layer 2 was 5.0% by weight (# 15), the protective layer 2 was cracked. Further, when the thickness of the colored layer 3 was 80 μm and the content of the ultraviolet absorber in the colored layer 3 was 5.0% by weight (# 17), the colored layer 3 was cracked.

  As can be seen from the results described above, the UV absorber content of the protective layer 2 is preferably 1.4 wt% or more and 4.0 wt% or less, and the UV absorber content of the colored layer 3 is 1.0 wt%. It is preferable that it is at least 4.0% by weight.

  To support this, the thicknesses of the protective layer 2 and the colored layer 3 are 30 μm or more and 60 μm or less and 15 μm or more and 80 μm or less, respectively, and the UV absorber content of the protective layer 2 and the colored layer 3 is within the above numerical range. In the case (# 12, # 18, # 19, # 20, # 21), a good evaluation result is obtained.

  In addition, a comparison is made between the case of using a solid UV absorbent and the case of using a liquid UV absorber contained in the colored layer 3 (comparison between # 22 and # 23, comparison between # 31 and # 32, # 38 and # 39), when a liquid ultraviolet absorber is used, cracking of the colored layer 3 hardly occurs, but bleeding occurs when the colored layer 3 is thick (for example, when the thickness is 90 μm). It turns out that it is easy to occur.

  As described above, the thickness of the protective layer 2 and the ultraviolet absorber content are 30 μm or more and 60 μm or less and 1.4 wt% or more and 4.0 wt% or less, respectively. By setting each to 15 μm or more and 80 μm or less and 1.0% by weight or more and 4.0% by weight or less, generation of cracks in the decorative sheet 10 can be prevented and sufficient weather resistance can be secured.

  1 illustrates a configuration in which the colored layer 3 is provided on the side opposite to the protective layer 2 with respect to the base material 1, the arrangement of the colored layer 3 is not limited to this. The colored layer 3 may be provided between the base material 1 and the protective layer 2 like the decorative sheets 10A and 10B shown in FIGS. 2 (a) and 2 (b).

  In the decorative sheet 10 </ b> A shown in FIG. 2A, the adhesive layer 4, the colored layer 3, and the protective layer 2 are provided in this order on the main surface 1 a of the substrate 1. Further, in the decorative sheet 10B shown in FIG. 2B, the colored layer 3, the adhesive layer 4 and the protective layer 2 are provided in this order on the main surface 1a of the substrate 1. In both of the decorative sheets 10A and 10B, as in the decorative sheet 10 shown in FIG. 1, since both the protective layer 2 and the colored layer 3 contain an ultraviolet absorber, excellent weather resistance is realized. The

  The decorative sheet 10A shown in FIG. 2A is manufactured, for example, as follows. First, the protective layer 2 is formed by extrusion molding. Next, the colored layer 3 is formed on the protective layer 2 by a printing method. Subsequently, the adhesive layer 4 is formed on the colored layer 3 or on the base material 1 separately formed by extrusion molding. Then, the decorative sheet 10 </ b> A is obtained by bonding the laminate of the protective layer 2 and the colored layer 3 and the base material 1 via the adhesive layer 4.

  The decorative sheet 10B shown in FIG. 2B is manufactured, for example, as follows. First, the base material 1 is formed by extrusion molding. Next, the colored layer 3 is formed on the substrate 1 by a printing method. Subsequently, an adhesive layer 4 is formed on the colored layer 3 or on the protective layer 2 separately formed by extrusion. Thereafter, the decorative sheet 10 </ b> B is obtained by bonding the laminate of the base material 1 and the colored layer 3 and the protective layer 2 via the adhesive layer 4.

  In any case, the adhesive layer 4 can be formed by various known methods using a known adhesive. The thickness of the adhesive layer 4 is, for example, 10 μm to 60 μm.

  Next, a method for decorating a molded product using the decorative sheet 10 will be described with reference to FIGS. 3 to 6. FIG. 3 is a diagram schematically illustrating a vacuum forming apparatus 100 for decorating a molded product using the decorative sheet 10, and FIGS. 4 to 6 schematically illustrate a molding process using the vacuum forming apparatus 100. FIG.

  A vacuum forming apparatus 100 shown in FIG. 3 includes a holding frame 30 that holds the decorative sheet 10, a support base 31 that supports the molded product, and a heater (for example, a far infrared heater) 33 that heats the decorative sheet 10. And a vacuum vessel 34 for housing them.

  The vacuum container 34 includes a main container 34 a that houses the grip frame 30 and the support base 31, and a sub container 34 b that houses the heater 33. The heater 33 is introduced into the main container 34a when the decorative sheet 10 is heated.

  The support base 31 has a plurality of openings 31a. The air in the main container 34a can be discharged to the outside through the opening 31a. Although not shown here, the main container 34a is provided with a mechanism (for example, a hose connected to the outside) for introducing gas into the main container 34a from the outside.

  The decoration of the molded product using the decorative sheet 10 is performed, for example, as follows using the vacuum forming apparatus 100 described above.

  First, as shown in FIG. 4A, a molded product main body 21 is prepared, and this molded product main body 21 is placed on a support base 31. The molded product body 21 may be formed from a resin material, may be formed from a metal material, or may be formed from other materials. The molded product main body 21 can be manufactured by using a known method, for example, by injection molding using a resin material.

  Next, as shown in FIG. 4B, a decorative sheet 10 is prepared, and the decorative sheet 10 is fixed to the gripping frame 30. The decorative sheet 10 includes a base material 1 and a protective layer 2 and a colored layer 3 each containing an ultraviolet absorber, as shown in a partially enlarged view in FIG.

  Subsequently, as shown in FIG. 5A, the decorative sheet 10 is heated using a heater 33, thereby softening the decorative sheet 10. At this time, the decorative sheet 10 is preferably heated to a temperature 20 ° C. to 30 ° C. higher than the minimum bonding temperature of the adhesive 8 in order to ensure good adhesiveness of the adhesive 8.

  Thereafter, as shown in FIG. 5B, after the decorative sheet 10 is brought close to the molded product body 21, the space 35 formed between the decorative sheet 10 and the molded product body 21 is decompressed, As a result, the decorative sheet 10 is joined to the molded product body 21 as shown in FIG. When the space 35 between the decorative sheet 10 and the molded product main body 21 is depressurized, the decorative sheet 10 is pressed against the molded product main body 21 with a uniform pressure, so that the joining is suitably performed.

  In the present embodiment, a larger pressure difference is generated by pressurizing the space 36 that extends above the decorative sheet 10. Thereby, joining of the sheet | seat 10 for decoration can be performed still more rapidly. The decompression of the space 35 is performed by, for example, discharging the air in the space 35 through the opening 31 a of the support base 31 using a vacuum pump. The space 36 is pressurized by supplying compressed air using a compressor (compressor), for example. In this joining step, the decorative sheet 10 is spread and molded along the surface of the molded product main body 21.

  Subsequently, as shown in FIG. 6 (b), the unnecessary portion 10 ′ of the decorative sheet 10 is cut (trimmed) using a cutting means such as a rotary blade, and then the molded product body 21 is removed from the support base 31. By removing, as shown in FIG.6 (c), the molded article 20 by which the surface was decorated is completed.

  When the decorative sheet 10 in the present embodiment is used, cracking of the protective layer 2 and the colored layer 3 can be prevented while ensuring sufficient weather resistance and wear resistance, and therefore suitable for outdoor use and aesthetics. Can be obtained.

  An example of the molded product 20 decorated with the decorative sheet 10 is shown in FIG. In the molded product 20 illustrated in FIG. 7, the decorative sheet 10 is attached to the back surface 21 a of the molded product main body 21 so as to be wound at the end of the molded product main body 21. Thus, a part of the decorative sheet 10 may be wound around the end of the molded product main body 21.

  Further, in FIG. 7, the thickness of each portion of the decorative sheet 10 stretched and pasted is shown with the thickest portion being 100%. As shown in FIG. 7, the decorative sheet 10 becomes thinner as it goes from the center part to the end part of the molded product 20, and the decorative sheet 10 is thinnest at the part where it is caught.

  Since the weather resistance of the decorative sheet 10 is lowest in the thinnest part, it is preferable that sufficient weather resistance is ensured even in the thinnest part. Therefore, as illustrated in FIG. 7, the present invention is highly effective when a part of the decorative sheet 10 is caught at the end of the molded product body 21.

  Further, the present invention is highly effective when the decorative sheet 10 is stretched thinly to some extent by molding at the time of application. Specifically, according to the present invention, a portion having a thickness of 30% or more and 50% or less with respect to the thickness of the thickest portion of the decorative sheet 10 after being attached (for example, a portion to be wound as described above) ) Is highly effective.

  Since the molded product decorated with the decorative sheet 10 in the present embodiment has excellent weather resistance and a beautiful appearance, it is suitably used as an exterior member for various transportation equipment. For example, it is suitably used as the tank cover 51, the front fender 52, and the tail cowl 53 of the motorcycle 50 shown in FIG.

  According to the present invention, it is possible to sufficiently improve the weather resistance of a decorative sheet that is pasted while being stretched on the surface of an article to be decorated, and to prevent the occurrence of cracks during pasting.

  Since the molded product decorated with the decorative sheet according to the present invention has excellent weather resistance and a beautiful appearance, it can be used for passenger cars, buses, trucks, motorcycles, tractors, airplanes, motor boats, civil engineering vehicles, etc. It is suitably used for exterior members of various transportation equipment.

1 is a perspective view schematically showing a decorative sheet 10 in a preferred embodiment of the present invention. (A) And (b) is sectional drawing which shows typically other decorative sheet | seat 10A and 10B in suitable embodiment of this invention. It is a figure which shows typically the vacuum forming apparatus used for the decoration of the molded article using the sheet | seat 10 for decoration. (A) And (b) is process sectional drawing which shows typically the shaping | molding process using the vacuum forming apparatus shown in FIG. (A) And (b) is process sectional drawing which shows typically the shaping | molding process using the vacuum forming apparatus shown in FIG. (A), (b) and (c) is process sectional drawing which shows typically the shaping | molding process using the vacuum forming apparatus shown in FIG. 3 is a cross-sectional view showing an example of a molded product decorated with a decorative sheet 10. FIG. 1 is a side view schematically showing a motorcycle. It is a perspective view which shows typically the conventional decorative sheet 110 used for decoration of a molded article. (A)-(c) is a figure which shows typically the process of decorating a molded article using a decoration sheet. It is sectional drawing which shows typically the resin laminated body 210 which has an acrylic resin layer containing a ultraviolet absorber.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Base material 1a, 1b Main surface of base material 2 Protective layer 3 Colored layer 4 Adhesive layer 8 Adhesive 10 Decoration sheet 20 Molded product 21 Molded product main body 30 Grip frame 31 Support base 31a Opening 33 Heater 34 Vacuum container 34a Main container 34b Sub container 50 Motorcycle 51 Tank cover 52 Front fender 53 Tail cowl 100 Vacuum forming device

Claims (7)

A decorative sheet that is pasted while being stretched on the surface of the item to be decorated,
A substrate having first and second major surfaces facing each other;
A protective layer provided on the first main surface side of the substrate;
A colored layer including a pigment provided on the second main surface side of the substrate or between the substrate and the protective layer;
With
The protective layer has a thickness of 30 μm or more and 60 μm or less, and includes an ultraviolet absorber of 1.4 wt% or more and 4.0 wt% or less,
The decorative sheet has a thickness of 15 μm or more and 80 μm or less, and a decorative sheet containing an ultraviolet absorber of 1.0 wt% or more and 4.0 wt% or less.   The decorative sheet according to claim 1, wherein the substrate has a thickness of 300 μm or more and 800 μm or less.   The decorative sheet according to claim 1, wherein the protective layer has a pencil hardness at room temperature higher than that of the substrate.   A molded article comprising: a molded article main body; and the decorative sheet according to any one of claims 1 to 3 attached to a surface of the molded article main body.   The molded product according to claim 4, wherein the decorative sheet is attached to the back surface of the molded product body so as to be wound at an end of the molded product body.   The molded article according to claim 4 or 5, wherein the decorative sheet includes a portion having a thickness of 30% to 50% with respect to a thickness of the thickest portion.   A transportation device comprising the molded product according to claim 4.

Images