JP5267019B2 - Manufacturing method of embossed decorative sheet - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for manufacturing an embossed decorative sheet to which emboss processing extremely reduced in the gloss change on a surface is applied in a post-step such as a vacuum molding step or the like. <P>SOLUTION: In the method for manufacturing the embossed decorative sheet, a decorative sheet, wherein at least a printing layer and an adhesive layer are provided on a base material comprising a transparent resin film with a glossiness of 20 or above, is heated to be inserted in the gap between an embossing roll 15 to which a shaping embossed pattern is applied and a pressure roll 14, and pressurized to shape an embossed pattern on the side of the adhesive layer. The difference between the glossiness of the transparent resin film before the embossed pattern is shaped and the glossiness of the pressure roll is set to &plusmn;10 or below and the pressure roll is cooled. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

  The present invention relates to a method for manufacturing an embossed decorative sheet, and more particularly, to a method for manufacturing an embossed decorative sheet having no gloss change in a subsequent process such as a vacuum forming process.

Injection molded products (hereinafter referred to as “decorated resin molded products”) decorated by laminating and integrating decorative sheets as adherends on the surface of resin molded products are used in various applications. These decorative resin molded products are required to have a concavo-convex pattern such as an embossed pattern on the decorative portion of the decorative resin molded product from the viewpoint of high design required in recent years. As its manufacturing method, it is conceivable to give an embossed pattern or the like to the decorative sheet in advance, but since the decorative sheet is made of a thermoplastic resin, a post-process such as a vacuum molding process or a molding resin injection process. However, the embossed pattern disappeared, and as a result, it was difficult to arrange the uneven pattern on the decorative resin molded product.
Therefore, various ideas have been made, for example, transparent or translucent thermoplasticity through an embossed pattern provided on a specific substrate sheet via a transparent or translucent adhesive resin layer that fills the unevenness. A decorative sheet formed by laminating resin sheets (see Patent Document 1 and Claim 1) has been proposed. This decorative sheet is a decorative sheet having so-called internal embossing that has been embossed on the inside, and it is said that an embossing return phenomenon due to expansion of the sheet is suppressed even by vacuum forming or the like (Patent Document 1, paragraph [ 0056]).

  By the way, as a method of embossing a decorative sheet or the like, an embossing manufacturing apparatus as shown in FIG. 1 is generally used. The embossing manufacturing apparatus 10 includes a heating drum 11, a guide roll 12, a heater 13, a pressure roll 14, and an embossing roll 15. The decorative sheet 1 is preliminarily heated by the heating drum 11, passes through the guide roll 12, is heated by the heater 13, and is inserted between the embossing roll 15 and the pressure roll 14, and the uneven shape is imparted. Shaped. In the case of an internally embossed decorative sheet, the surface side of the decorative sheet (the surface side of the decorative resin molded product) is in contact with the pressure roll, so the gloss of the pressure roll is transferred to the surface of the decorative sheet. The

JP 2004-50777 A

In the decorative sheet having internal embossing as disclosed in Patent Document 1, the gloss of the pressure roll is transferred to the surface of the decorative sheet as described above. However, it has been clarified by the inventors' examination that the temperature changes under heating conditions such as a vacuum forming step of the decorative sheet.
In the case of embossing a sheet having a transparent resin film as a base material using an embossing production apparatus as shown in FIG. 1, it is common to use silicone rubber as a pressure roll. This is because the silicone rubber roll has an excellent releasability from the sheet and is advantageous in that it does not cause a phenomenon called “pressed”, that is, the sheet does not come into close contact with the pressure roll. The reason why "pressure is not taken" is that the glossiness of the silicone rubber roll is low, and the glossiness is usually about 8.

When such a silicone rubber roll is used as a pressure roll and embossing (internal embossing) is applied to a decorative sheet based on a transparent resin film having a gloss level of 20 or more, the gloss of the pressure roll is the decorative sheet. Is transferred to the transparent resin film substrate, and its glossiness is reduced to about 10. When the decorative sheet is placed under heating conditions such as a vacuum forming process, the gloss of the base material is changed, and finally, it is revealed by the inventors that it returns to the gloss of the original transparent resin film. .
Moreover, because the way the gloss returns changes depending on the heating conditions in the subsequent steps such as the vacuum forming step, specifically the heating temperature and the heating time, a decorative resin molded product having a stable design cannot be obtained. I understood it.
Under such circumstances, the present invention provides a method for producing an embossed decorative sheet (hereinafter referred to as an “embossed decorative sheet”) having a very small surface gloss change in a subsequent process such as a vacuum forming process. The purpose is to provide.

As a result of intensive studies to achieve the above object, the inventors have previously measured the glossiness of a transparent resin film used as a substrate, and have a glossiness close to the glossiness. It has been found that the above problem can be solved by selecting a roll. Furthermore, it has been found that the problem of “pressure squeezing” caused by using a specific pressure roll can be eliminated by cooling the pressure roll. The present invention has been completed based on such findings.
That is, the present invention heats a decorative sheet having at least a printing layer and an adhesive layer on a substrate made of a transparent resin film having a glossiness of 20 or more, and pressurizes with an embossing roll provided with an irregular pattern for shaping. It is a manufacturing method of an embossed decorative sheet that is inserted between a roll and pressurizes to form a concavo-convex pattern on the adhesive layer side, and the glossiness of the transparent resin film before the concavo-convex pattern is formed The present invention provides a method for producing an embossed decorative sheet, wherein the difference in glossiness between pressure rolls is within ± 10 and the pressure roll is cooled.

  According to the manufacturing method of the present invention, an embossed decorative sheet having a very small surface gloss change before and after the process can be manufactured in a subsequent process including a process of heating the decorative sheet such as a vacuum forming process.

The manufacturing method of the embossed decorating sheet of this invention is demonstrated in detail, referring FIG.
In the production method of the present invention, as shown in FIG. 1, the decorative sheet 1 is preliminarily heated with, for example, a heating drum 11, then moved through a guide roll 12, and heated with a heater 13. The concavo-convex pattern is shaped by inserting and pressing between the embossing roll 15 and the pressure roll 14 provided with the predetermined concavo-convex pattern for shaping.
A feature of the present invention is that the glossiness of the transparent resin film before the uneven pattern is shaped is measured in advance, and the difference between the glossiness and the glossiness of the pressure roll 14 is within ± 10. .
The glossiness is measured at an angle of 60 degrees using a testing machine “GMX-202” manufactured by Murakami Color Research Laboratory in accordance with JIS K5600-4-7 (ISO1512).

First, as shown in FIG. 2, the decorative sheet that is the subject of the present invention has at least a printing layer 3 and an adhesive layer 4 on a substrate 2 made of a transparent resin film having a glossiness of 20 or more.
The transparent resin film used in the present invention is not particularly limited as long as it is a substrate that is excellent in transparency and can impart an excellent coating feeling, and preferably includes an acrylic resin film, a polycarbonate resin film, a polyester resin film, and the like. It is done. The transparent resin film may be translucent, but it is preferable that the transparent resin film is transparent to make the printed layer 3 vividly colored. When it is transparent, it may be colored and transparent in addition to colorless and transparent.

The thickness of the transparent resin film used as the substrate 2 is preferably in the range of 20 to 500 μm. When it is 20 μm or more, embossing is easy to be performed, while when it is 500 μm or less, the film follows the three-dimensional shape during the subsequent three-dimensional processing and does not break. From the above viewpoint, the thickness of the substrate 2 is more preferably in the range of 50 to 150 μm. The present invention is applied to a decorative sheet having a glossiness of 20 or more of the transparent resin film. This is because the decorative sheet having a glossiness of less than 20 does not particularly cause a problem of gloss change of the decorative sheet even with the conventional method.

Examples of the acrylic resin used for the substrate include polymethyl (meth) acrylate, polyethyl (meth) acrylate, polybutyl (meth) acrylate, methyl (meth) acrylate-butyl (meth) acrylate copolymer, and methyl (meth) acrylate. -Acrylic resin such as styrene copolymer (where (meth) acrylate refers to acrylate or methacrylate).
The polycarbonate resin includes a polymer obtained by a phosgene method in which a dihydroxydiaryl compound and phosgene are reacted or a transesterification method in which a dihydroxydiaryl compound and a carbonic ester such as diphenyl carbonate are reacted. Examples thereof include polycarbonate resins produced from 2,2-bis (4-hydroxyphenyl) propane and bisphenol A.
Examples of the polyester resin include polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, polyarylate, polycarbonate, ethylene terephthalate-isophthalate copolymer, and polyarylate. Among these, polyethylene terephthalate, polybutylene terephthalate, and the like are preferable, and polyethylene terephthalate is particularly preferable.
As the transparent resin film, the above-mentioned resin material is used as a single layer or a mixture of two or more types as a single layer or a laminate of two or more layers.

In the transparent resin film, if necessary, a matting agent; a lubricant such as polyethylene wax or paraffin wax; an ultraviolet absorber such as benzotriazole, benzophenone, or fine particle cerium oxide; a hindered amine radical scavenger Various additives such as a light stabilizer such as a plasticizer, a stabilizer, and a colorant may be added to adjust the physical properties.
As for the method for producing the transparent resin film, a conventionally known general method, for example, a so-called extrusion T-die method in which the transparent resin is extruded from a linear slit, a so-called calendar processing method in which the transparent resin is stretched by a hot roll, It is possible to use a so-called casting method in which a liquid transparent resin is poured into a mold and solidified.

Next, the printed layer 3 in the decorative sheet of the present invention preferably has a colored solid layer, and in addition to the colored solid layer, it preferably has a design layer from the viewpoint of improving the design. Usually, the pattern layer is applied to the outside of the colored solid layer (the surface side of the colored solid layer).
The colored solid layer and the picture layer are basically not particularly limited, except that the binder resin is composed of a specific resin and an appropriate colorant for obtaining a desired color is blended. The colored solid layer and the pattern layer are usually formed by a known printing method such as gravure printing, letterpress printing, silk screen printing, offset printing, and ink jet printing with a printing ink. The colored solid layer may be a known coating method such as roll coating.
Although there is no restriction | limiting in particular as thickness of the printing layer 3, Usually, about 1-20 micrometers, Preferably it is 1-10 micrometers.

The ink (or coating liquid) used for forming the printing layer 3 may be appropriately selected from known ones in consideration of adhesiveness and the like. For example, acrylic resin, vinyl chloride-vinyl acetate copolymer, polyester resin, polyurethane resin, etc. are usually used as the binder resin for the ink (or coating liquid). Among these, it is more preferable that the binder resin is mainly composed of an acrylic resin alone or a mixture of an acrylic resin and a vinyl chloride-vinyl acetate copolymer. In the present invention in which the base film 2 is an acrylic resin, an acrylic resin is used to improve the adhesion to the base film 2, and further a vinyl chloride-vinyl acetate copolymer or another acrylic resin is mixed. Printability and moldability are further improved.
Here, as an acrylic resin, it selects suitably from the thing similar to what was listed in the above-mentioned base material 2, methyl (meth) acrylate, ethyl (meth) acrylate, butyl (meth) acrylate, 2-ethylhexyl. (Meth) acrylate, alkyl methacrylate (meth) acrylate such as octyl (meth) acrylate, 2-hydroxyethyl (meth) acrylate, 2-hydroxybutyl (meth) acrylate, 2-hydroxy-3-phenoxypropyl (meth) An acrylic polyol obtained by copolymerizing a (meth) acrylic acid ester having a hydroxyl group in a molecule such as acrylate can also be used.
As the vinyl chloride-vinyl acetate copolymer, those having a vinyl acetate content of about 5 to 20% by mass and an average degree of polymerization of about 350 to 900 are usually used. If necessary, the vinyl chloride-vinyl acetate copolymer may be further copolymerized with a carboxylic acid such as maleic acid or fumaric acid. The mixing ratio of the acrylic resin and the vinyl chloride-vinyl acetate copolymer is about acrylic resin / vinyl chloride-vinyl acetate copolymer = 1/9 to 9/1 (mass ratio). In addition, as a subcomponent resin, if necessary, other resins such as thermoplastic polyester resin, thermoplastic urethane resin, chlorinated polyethylene, chlorinated polypropylene, and other chlorinated polyolefin resins may be mixed. Also good.
Examples of the colorant contained in the ink (or coating liquid) include inorganic pigments such as titanium white, zinc white, carbon black, iron black, petal, cadmium red, ultramarine, cobalt blue, chrome lead, and titanium yellow. , Phthalocyanine blue, indanthrene blue, isoindolinone yellow, quinacridone red, perylene red and other organic pigments, metal powders such as aluminum and brass or metal pigments such as scales, titanium dioxide-coated mica powder and pearls such as scales (Pearl) pigments or dyes are used.

The pattern of the pattern layer is, for example, a wood grain pattern, a stone pattern, a grain pattern, a cloth pattern, a leather pattern, a tiled pattern, a brickwork pattern, a geometric figure, a character, a symbol, and the like.
If desired, the printing layer 3 may have a functional layer such as a light reflection layer, a magnetic layer, or a conductive layer. Here, as the light reflecting layer, for example, a metal thin film layer formed by depositing a metal (aluminum, chromium, silver, etc.) on the surface of the resin film, or a white coating with excellent reflectivity on the surface. Examples thereof include a resin film having a film or a metallic gloss coating (using a metal-containing ink such as aluminum, chromium, silver, etc.). When the light reflecting layer is formed on the entire surface of the printing layer 3, it becomes a colored solid layer, and when it is partially formed, it becomes a pattern layer. The magnetic layer includes a magnetic material, and the conductive layer includes a conductive material.

As the adhesive layer 4, for example, a known resin such as a thermoplastic resin or a thermosetting resin is used as a heat-sensitive adhesive. In the thermoplastic resin, for example, one or a mixture of two or more of acrylic resin, chlorinated polyolefin resin, vinyl chloride-vinyl acetate copolymer, thermoplastic urethane resin, thermoplastic polyester resin, polyamide resin, rubber resin, etc. Is used. In the thermosetting resin, a urethane resin, an epoxy resin, or the like is used.
The adhesive layer 4 is formed by known printing or coating methods such as gravure printing and roll coating, using an adhesive made of these resins. The thickness of the adhesive layer 4 is not particularly limited, but is usually about 1 to 20 μm, preferably 1 to 10 μm.

  As a method for producing the decorative sheet 1 in the present invention, for example, the printed layer 3 is printed or coated in the order of the pattern layer and the colored solid layer on the back surface of the transparent resin film that is the substrate 2, and then the adhesive. Layer 4 may be applied.

The heating condition for the decorative sheet 1 in the production method of the present invention is preferably carried out at a temperature of 150 ° C. or higher, more preferably 150 to 260 ° C., and 160 to 250 ° C. More preferably, it is carried out at a temperature, particularly preferably at a temperature of 200 to 240 ° C. It is for the transparent resin film which comprises the decorating sheet 1 to be processed rapidly. Here, the temperature of the embossing process being 150 ° C. means that the temperature of the decorative sheet 1 before shaping at the time of processing is 150 ° C.
The embossing is performed by appropriately adjusting the depth so that the design of the concavo-convex pattern is enhanced. In the present invention, a concavo-convex pattern is formed on the adhesive layer 4 side. However, the concavo-convex pattern may be formed at a depth within the range of the thickness of the adhesive layer 4, and the concavo-convex pattern may be formed on the printing layer 3 and the substrate 2. You may carry out by the depth provided.

The decorative sheet 1 is inserted between an embossing roll 15 and a pressure roll 14 provided with a predetermined shaping uneven pattern, and is pressed to form the uneven pattern on the adhesive layer side. Here, it is important that the difference between the glossiness of the pressure roll and the glossiness of the transparent resin film before the uneven pattern is formed is within ± 10.
Since the transparent resin film used in the present invention has a glossiness of 20 or more, the glossiness of at least the surface of the pressure roll 14 is 10 or more. Therefore, a conventionally used silicone rubber roll having a gloss level of 8 cannot be used.
The pressure roll that can be used in the present invention is not limited as long as the gloss difference between the embossed decorative sheet and the transparent resin film is within ± 10, and carbon-containing EPT (Ethylene-Propylene Terpolymer Or the like, and a cylindrical outer periphery made of a metal such as iron and the like and a cylindrical elastic body such as the above-mentioned carbon-containing EPT can be used. Of these, carbon-containing EPT is preferable from the viewpoint of finish processing suitability for surface polishing.

  Moreover, as the hardness of a pressure roll, the range of 50-95 is preferable. A hardness of 50 or more is advantageous in terms of glossy surface finish, and a range of 70 to 95 is more preferable. The hardness was determined by an IRHD pocket hardness test according to JIS K 6253 (ISO 7619).

As described above, the higher the glossiness of the pressure roll, the more so-called “pressed” phenomenon appears. In the present invention, this problem is solved by cooling the pressure roll. The temperature of the pressure roll is not limited as long as “pressure is not taken” and is within a range where the effects of the present invention can be achieved. Specifically, the pressure roll is cooled to a temperature lower than that of the heated decorative sheet. It is preferable that it is 110 degrees C or less.
Also, the method for cooling the pressure roll is not particularly limited as long as the effect of the present invention is achieved, a method for providing a space for cooling water inside the pressure roll, and injecting the cooling water into the space, A method in which a part of the pressure roll is brought into direct contact with the cooling water in the cooling water tank, a method in which cold air is blown onto the pressure roll using a cold air device, and a touch in which a metal roll in which cooling water is circulated is brought into contact with the pressure roll. Examples include a roll type.

  The embossed decorative sheet obtained by the production method of the present invention is not particularly limited with respect to the uneven average depth, but a range of 30 to 80 μm is preferable. When the average depth of the unevenness on the surface is 30 μm or more, a sufficient uneven pattern can be applied to the decorated resin molded product, and when it is 80 μm or less, the embossed decorative sheet is wound on a roll and stored. In this case, it is preferable that the unevenness is too intense, so that damage or tearing during transportation, collapse of winding, etc. do not occur. From the above viewpoint, it is more preferable that the surface roughness average depth is in the range of 30 to 60 μm. In addition, the uneven | corrugated average depth of the surface was measured using "Handy Surf E35A" by Tokyo Seimitsu Co., Ltd.

The embossed decorative sheet obtained by the production method of the present invention has a surface gloss change before and after the post-process including a step of heating the decorative sheet such as a vacuum forming process or a molding resin injection process. Since it can be 30 or less, preferably 20 or less, and most preferably 10 or less, it is useful for applications in which the base material surface of the embossed decorative sheet constitutes the surface of a molded product or the like.
Specifically, it is particularly useful for the following uses.
(1) A decorative sheet used in a method (in-mold method) in which a decorative sheet is placed inside an injection mold, a molding resin is injected into a cavity, and the decorative sheet is integrally bonded to the surface of the molding resin.
(2) Before placing the decorative sheet inside the injection mold, the sheet is three-dimensionally processed by vacuum forming or the like, punched into a desired shape, and then fitted into a recess or the like in the injection mold. The decorative sheet is used for a method (insert molding) in which the molded resin is injected into the cavity, and the molded resin decorative sheet is integrally bonded to the surface of the molded resin.
(3) After the decorative sheet is placed in the injection mold, it is three-dimensionally processed by vacuum molding or the like along the recess of the injection mold, and after mold clamping, the molding resin is injected into the cavity and molded. A decorative sheet used for a method (thermoject molding) in which a decorative sheet is integrally bonded to a resin surface simultaneously with molding.
(4) On the surface of a base material for a decorative material such as a wooden base material previously molded into a three-dimensional solid shape of the target decorative material, the decorative sheet is spread while being heated and softened, and the decorative material for the decorative sheet Adhesion lamination while forming the decorative sheet along the three-dimensional shape of the surface of the base material for decorative material by depressurizing the space on the base material side and pressurizing the space on the opposite side as necessary Decorative sheet used for the method (membrane pressing method or membraneless pressing method).

In the case of the above-described insert molding, a backer film may be provided on the side of the adhesive layer 4 that has been embossed. In this case, the total thickness including the decorative sheet and the backer film is preferably 0.03 to 2.00 mm. If it is 0.03 mm or more, the decorative sheet follows the three-dimensional shape and does not break, and if it is 2.00 mm or less, it is possible to follow a fine groove, and the aperture on the end face of the product may become shallow. Absent. From the above points, the overall thickness is more preferably in the range of 0.2 to 1.0 mm.
Further, the backer film is determined in consideration of the adhesiveness with the molding resin to be injected, and is usually composed of the same resin as the molding resin. That is, when the molding resin is an ABS resin, the backer film is also preferably made of an ABS resin.

  In the above methods (1) to (3), the molded resin to be injected includes polyolefin resins such as polyethylene (PE), polypropylene (PP), and a mixture of PP and PE; acrylonitrile-butadiene-styrene resin (ABS resin); polycarbonate (PC); mixture of ABS resin and PC; acrylic resin; polystyrene; polyester such as polyethylene terephthalate (PET), polybutylene terephthalate (PBT), polyethylene naphthalate (PEN), and mixtures thereof Is mentioned.

EXAMPLES Hereinafter, although this invention is demonstrated concretely using an Example, this invention is not limited to these examples.
Production Example 1 (Manufacture of decorative sheet)
A heat-resistant acrylic resin film (thickness 125 μm, surface glossiness 70) having a glass transition temperature (hereinafter referred to as Tg) of 104 ° C. is used as a substrate, and polybutyl methacrylate / vinyl chloride-vinyl acetate is used on the back surface. Gravure printing a pattern layer made of a copolymer (mass ratio: 2/1) composition, and gravure printing a metallic gloss coating on a part of the area where the pattern layer is not printed. A colored solid layer containing a high hiding pigment (titanium white and colored pigment) is applied by roll coating (thickness 4 μm as a printing layer), and an adhesive layer (thickness 3 μm) made of acrylic resin is rolled. After coating with a coat, it was dried to obtain a decorative sheet.

Production Example 2 (Manufacture of decorative sheets)
A decorative sheet was produced in the same manner as in Production Example 1 except that a heat-resistant acrylic resin film (thickness 125 μm, surface glossiness 40) having a Tg of 100 ° C. was used as the substrate.

Example 1
(1) Embossing Using the apparatus shown in FIG. 1, embossing was performed on the adhesive layer side of the decorative sheet obtained in Production Example 1. For embossing, the temperature of the heating drum 11 is 60 ° C., the sheet temperature just before shaping is 250 ° C., a metal embossing roll (the copper surface is chrome plated) is used, and the temperature of the embossing roll is 100 ° C. It was. As the pressure roll, a roll containing a carbon-containing EPT rubber roll (hardness 80) was buffed to give a glossiness of 60, and cooled to 100 ° C. with a touch roll type. Further, embossing was performed at a decorative sheet conveyance speed of 9 m / s. So-called “pressed” did not occur.
The glossiness of the surface side of the decorative sheet (embossed decorative sheet) after embossing (the side in contact with the pressure roll) is 60 degrees using a testing machine “GMX-202” manufactured by Murakami Color Research Laboratory. As a result, the glossiness was 58.
(2) Vacuum forming heating The embossed decorative sheet obtained in (1) above is heated for 4 seconds under the condition of a temperature of 120 ° C., and then subjected to vacuum forming to obtain the same glossiness as the above. As a result of measurement by the method, the glossiness was 60 and no significant change in gloss was observed. The vacuum forming was also performed at a film temperature of 120 ° C.
Under the same heating conditions, the surface was heated for 5, 6, 7, 8, 9 and 10 seconds, respectively, and then vacuum forming was carried out to measure the glossiness of the formed surface. The results are shown in Table 1. In all cases, no significant change in gloss was observed.

Example 2
Instead of the decorative sheet manufactured in Manufacturing Example 1, the decorative sheet manufactured in Manufacturing Example 2 was used, and the surface of a carbon-containing EPT rubber roll (hardness 80) was buffed as a pressure roll. Except that the glossiness of 40 was used, embossing was performed in the same manner as in Example 1, heat treatment was performed in the same manner, and vacuum molding was then performed to measure the glossiness of the molded surface. The results are shown in Table 1. In Example 2, “pressure was not taken” occurred.

Comparative Example 1
In Example 1, embossing was performed in the same manner as in Example 1 except that a silicone rubber roll (hardness 60, glossiness 8) was used as the pressure roll, heat treatment was performed in the same manner, and then vacuum forming was performed. The glossiness of the molded surface was measured. The results are shown in Table 1.

Comparative Example 2
In Example 2, embossing was performed in the same manner as in Example 2 except that a silicone rubber roll (hardness 60, glossiness 8) was used as the pressure roll, heat treatment was performed in the same manner, and then vacuum forming was performed. The glossiness of the molded surface was measured. The results are shown in Table 1.

As is apparent from Table 1, the embossed decorative sheet (Example 1 and Example 2) produced by the method of the present invention has a small change in gloss (gloss) due to heating time. On the other hand, it can be seen that in Comparative Examples 1 and 2 using the conventional pressure roll, the glossiness (gloss) changes greatly depending on the heating time. That is, in the case of the conventional method, when the time required for the subsequent molding process varies between 4 and 10 seconds, the glossiness of the surface of the molded product is between 19 and 70 in the case of Comparative Example 1, In the case of Comparative Example 2, the result varies between 12 and 41, and the design properties vary. It is not easy to manage the variation in designability by the molding process time, and it is extremely complicated.
On the other hand, it can be seen that the embossed decorative sheet produced by the method of the present invention has small variations in each molding process time. That is, in Example 1, the variation in glossiness between 4 and 10 seconds was 15 or less, and in Example 2, it was 10 or less. Therefore, a molded product with good reproducibility and small design variation can be obtained without strictly controlling the molding process time.

In the embossed decorative sheet obtained by the production method of the present invention, the gloss change of the surface is extremely small in a subsequent process such as a vacuum forming process. Therefore, in the in-mold method, insert molding, thermoject molding, membrane pressing method or membraneless pressing method, it is possible to impart design properties to the molded product with good reproducibility. Further, the production method of the present invention can produce an embossed decorative sheet stably without causing so-called “pressing”.
Molded articles using the embossed decorative sheet of the present invention include automotive interior parts such as console panels, center clusters, and switch bases, painted side mat guards, bumper, automotive exterior parts such as foil caps and moldings, kitchen doors, It is suitably used for decorative materials with complex three-dimensional solid shapes, building exteriors, interiors, fittings, furniture, and other surface decorations such as schoolchildren's desk members.

It is a schematic diagram which shows an embossing manufacturing apparatus. It is a cross-sectional schematic diagram which shows the embossed decorating sheet manufactured by this invention.

Explanation of symbols

1: Embossed decorative sheet 2: Base material 3: Print layer 4: Adhesive layer 5: Embossed surface 10: Embossed production apparatus 11: Heating drum 12: Guide roll 13: Heater 14: Pressure roll 15: Embossed roll

Claims (6)

  A decorative sheet having at least a printing layer and an adhesive layer is heated on a base material made of a transparent resin film having a glossiness of 20 or more, and is inserted between an embossing roll and a pressure roll provided with an irregular pattern for shaping. The embossed decorative sheet is formed by pressing to form a concavo-convex pattern on the adhesive layer side, and the glossiness of the transparent resin film and the pressure roll before the concavo-convex pattern is formed. The manufacturing method of the embossing decorating sheet | seat characterized by making the difference of less than +/- 10 and cooling a pressurization roll.   The method for producing an embossed decorative sheet according to claim 1, wherein the pressure roll has a temperature of 110 ° C. or lower. The method for producing an embossed decorative sheet according to claim 1 or 2, wherein the pressure roll is a roll or a rubber roll in which a cylindrical outer periphery made of metal is coated with an elastic body in a cylindrical shape .   The method for producing an embossed decorative sheet according to claim 3, wherein the rubber roll is made of carbon-containing EPT rubber.   The heating temperature of a decorating sheet is 150 degreeC or more, The manufacturing method of the embossed decorating sheet in any one of Claims 1-4.   The method for producing an embossed decorative sheet according to claim 1, wherein the transparent resin film is an acrylic resin film, a polycarbonate resin film, or a polyester resin film.

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