JP2012051218A - Decorative sheet and decorated molded article - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a decorative sheet which can give high design to a surface of a resin molded article and can decrease a problem of design change in injection molding of the resin molded article.SOLUTION: A decorative sheet 2 includes a decorating sheet 3, a transparent resin sheet 4 piled up on the surface of the decorating sheet 3, and a resin backer sheet 5 piled up on the back surface of the decorating sheet 3 on the side opposite to the transparent resin sheet 4. The decorating sheet 3 includes a print substrate 6 of sheet form formed of a thermoplastic resin which is different from the resin of the backer sheet 5, a design printed layer 7 formed on the surface of the print substrate 6, a convexo-concave pattern 8 formed by fabricating the print substrate 6 including the design printed layer 7 so as to have a convexo-concave surface, and a laminate layer 9 laminating the surface of the convexo-concave pattern 8 with a resin equivalent to the resin of the print substrate 6. The decorating sheet 3 is piled up through insert molding on the surface of the resin molded article 1 via the backer sheet 5.

Description

  The present invention relates to an interior / exterior material in a building such as a house, a building material such as a construction material, a fitting, a vehicle interior part, a decorative sheet used for decorating the surface of a mobile phone, a personal computer, and the like, and the use thereof The present invention relates to a decorative molded product.

Conventionally, this type of decorative sheet includes a single-layer structure in which a pattern is printed on the front or back surface of a sheet base material made of a thermoplastic resin such as a vinyl chloride resin, a polyolefin resin, or an acrylic copolymer resin. Some of them have a multilayer structure in which a transparent sheet made of a thermoplastic resin is laminated on a pattern printing layer formed on the surface of a plastic resin sheet substrate.
A decorative sheet using a vinyl chloride resin as a material for a sheet base material or a transparent sheet has been widely used since it is excellent in printability, high designability, adhesion to a base material, and the like. However, since vinyl chloride resin generates hydrogen chloride gas that causes acid rain during incineration and may cause environmental problems, decorative sheets using polyolefin resin as a thermoplastic resin instead of vinyl chloride resin. It has been proposed and developed (see Patent Document 1).

  When a decorative sheet made of such a thermoplastic resin is applied to the surface of various parts to give design, it is required to attach to a three-dimensional surface in addition to bonding to a flat surface as the shape of the part becomes complicated. Is done. In this case, as a bonding method to a three-dimensional surface, bonding by a wrapping method or the like has been conventionally performed. In particular, in the field of injection molding, there is a known simultaneous injection molding method (insert molding method) in which a decorative sheet is laminated on the surface of a resin molded product at the same time as injection molding, and the surface of the resin molded product is decorated with a decorative sheet. (See Patent Document 2).

JP 2001-353828 A JP 2003-145998 A

  In recent years, with respect to the design properties imparted by decorative sheets, in addition to the conventional design properties by pattern printing, it has been required to give unevenness patterns by embossing etc. to decorative sheets to impart high design properties to various parts There is. However, when decorating the surface of a resin molded product using a decorative sheet with a concavo-convex pattern such as embossing by the simultaneous injection molding method, the decorative sheet is in close contact with the mold. The decorative sheet is softened by the heat and pressure of the molten resin injected into the mold, and the uneven pattern of the softened decorative sheet changes to the shape of the mold, which causes a problem that the pattern cannot be held.

In addition, in the process of laminating a decorative sheet on the surface of a resin molded product by insert molding, the design of the decorative sheet near the gate is greatly affected by heat and shear due to the melt flow of the molten resin loaded on the decorative sheet during injection molding. There was also a problem with the change.
The present invention has been made in order to solve the above-mentioned problems, and the object of the present invention is to provide high designability to the surface of the resin molded product and to design the resin molded product at the time of injection molding. An object of the present invention is to provide a decorative sheet that can improve the change in sex and a decorative molded product using the same.

  In order to solve the above-mentioned problem, the invention according to claim 1 of the present invention includes a decorative sheet for adding decoration to the surface of a resin molded product, and a transparent sheet laminated on the surface of the decorative sheet. And a backer sheet laminated on the back surface of the decorative sheet opposite to the transparent sheet, wherein the transparent sheet and the backer sheet are a decorative sheet made of a thermoplastic resin, The printing including the printing original fabric in which the decorative sheet is formed into a sheet shape from a thermoplastic resin different from the backing sheet, the pattern printing layer formed on the surface of the printing original fabric, and the pattern printing layer It comprises a concavo-convex pattern formed by processing the surface of the original fabric into a concavo-convex shape, and a laminate layer that laminates the surface of the concavo-convex pattern with a resin equivalent to the printing original fabric, and the decorative sheet is used for the backer Sheet Through it, characterized in that it is laminated by insert molding on the surface of the resin molded article.

The invention according to claim 2 of the present invention is the decorative sheet according to claim 1, wherein the printing raw fabric is formed by blending a luster pigment in a thermoplastic resin different from the backing sheet. And
According to a third aspect of the present invention, in the decorative sheet according to the first aspect, the pattern print layer is made of an ink containing a bright pigment.

The invention according to claim 4 of the present invention is the decorative sheet according to claim 1, wherein the concavo-convex pattern has a striped pattern composed of a plurality of parallel straight lines or curved strips with fine intervals as a unit, It is characterized in that the stripe directions of adjacent unit stripe patterns are combined so that the stripe directions are different from each other.
The invention according to claim 5 of the present invention is the decorative sheet according to any one of claims 1 to 4, wherein the backer sheet is 0.5 times or more the thickness of the decorative sheet. It is formed from a thermoplastic resin having a thickness of 0.0 times or less and a glass transition temperature higher by 30 ° C. or more than that of the original printing material.

The invention according to claim 6 of the present invention is the decorative sheet according to any one of claims 1 to 5, wherein the printing raw material is formed from a polyolefin-based resin, and the transparent sheet is formed from a transparent acrylic resin. It is characterized by being.
The invention according to claim 7 of the present invention is the decorative sheet according to any one of claims 1 to 6, wherein the printing raw fabric is formed from a polyolefin resin, and the transparent sheet is formed from a transparent acrylic resin. The backer sheet is formed of an acrylic resin.

The invention according to claim 8 of the present invention is the decorative sheet according to any one of claims 1 to 6, wherein the printing raw fabric is formed from a polyolefin resin, and the transparent sheet is formed from a transparent acrylic resin. The backer sheet is formed of a polyester-based resin.
The invention according to claim 9 of the present invention is the decorative sheet according to any one of claims 1 to 8, wherein the pattern printing layer is formed by printing a wood grain pattern on the surface of the printing original fabric. It is characterized by.

  The invention according to claim 10 of the present invention comprises a resin molded article and a decorative sheet for decorating the surface of the resin molded article simultaneously with injection molding of the resin molded article, and the decorative sheet is claimed in claims 1-9. It is the decorative sheet described in any one of the above.

According to the invention described in claim 1, the printing sheet in which the decorative sheet is formed in a sheet shape from a thermoplastic resin different from the backer sheet, and the pattern printing formed on the surface of the printing sheet A concavo-convex pattern formed by processing the surface of the printing original fabric including the pattern printing layer into an uneven shape, and a laminate layer that laminates the surface of the uneven pattern with a resin equivalent to the printing original fabric. By becoming, it becomes possible to provide a complicated design property to a resin molded product. Also, by laminating the surface of the pattern printing layer with a laminate layer made of a thermoplastic resin, the decorative sheet is laminated on the surface of the resin molded product by insert molding, and the surface of the resin molded product is decorated with the decorative sheet. In addition, the shape of the concavo-convex pattern can be maintained in a desired shape, and a unique design feeling can be created by forming the concavo-convex pattern inside the decorative sheet. Further, by laminating the surface of the picture print layer with a laminate layer made of a thermoplastic resin, damage and dirt on the picture print layer can be prevented. Moreover, by laminating a transparent sheet on the surface of the decorative sheet, functions such as scratch resistance and weather resistance can be imparted to the decorative sheet, and a sense of depth can be imparted to the decorative sheet. Furthermore, by laminating the backer sheet on the surface of the decorative sheet opposite to the transparent sheet, the heat and pressure applied to the decorative sheet during the injection molding of the resin molded product are alleviated by the backer sheet. Further, it is possible to suppress the occurrence of thermal deformation or the like in the uneven pattern of the decorative sheet during the injection molding of the resin molded product.

According to invention of Claims 2-4, the special design feeling from which a feeling of shining changes with viewing angles can be provided to a resin molded product.
According to the invention described in claims 5 to 8, the heat and pressure of the molten resin injected into the mold at the time of injection molding of the resin molded product directly affect the printing raw material of the decorative sheet. It can suppress, and it can suppress more effectively that the uneven | corrugated pattern of the sheet | seat for decorating deform | transforms with molten resin.

  According to the ninth and tenth aspects of the present invention, it is possible to add interior materials, building materials, automobile interior members, casing members such as mobile phones and personal computers, which have excellent design properties, manufacturing costs, and mass production stability. A decorative molded product can be provided.

It is sectional drawing which shows the 1st Embodiment of this invention typically. It is sectional drawing which shows the 2nd Embodiment of this invention typically.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 shows a first embodiment of the present invention. In the figure, reference numeral 1 denotes an interior material, a building material, a car interior member, a resin molded product such as a housing member for a mobile phone or a personal computer, and 2 denotes a decorative sheet according to the first embodiment of the present invention. The decorative sheet 2 includes a decorative sheet 3, a transparent sheet 4, and a backer sheet 5.

  The decorative sheet 3 adds decoration to the surface of the resin molded product 1, and is formed on the surface of the backer sheet 5 laminated on the surface of the resin molded product 1. The decorative sheet 3 includes a sheet-shaped printing original 6 made of a thermoplastic resin, a pattern printing layer 7 formed on the surface of the printing original 6, and a printing original including the pattern printing layer 7. 6 is formed of a concavo-convex pattern 8 formed by processing the surface of the concavo-convex pattern 6 and a laminate layer 9 for laminating the surface of the concavo-convex pattern 8, and the laminate layer 9 is formed of a thermoplastic resin equivalent to the printing raw fabric 6. Has been.

The transparent sheet 4 is for protecting the surface of the decorative sheet 3 and covers the entire surface of the decorative sheet 3 on the surface of the decorative sheet 3 with a thermoplastic resin such as a transparent acrylic resin. It is formed as follows.
The backer sheet 5 is used to relieve heat and pressure applied to the printing raw fabric 6 and the laminate layer 9 of the decorative sheet 3 when the surface of the resin molded product 1 is decorated by the simultaneous injection molding method. It is a thing and is formed from the thermoplastic resin different from the printing original fabric 6 of the sheet | seat 3 for decorating. Specifically, it is formed from a thermoplastic resin whose glass transition temperature is 30 ° C. or more higher than that of the printing original fabric 6. The backer sheet 5 is formed in a sheet shape with a thickness of 0.5 to 5.0 with respect to the thickness of the printing original fabric 6.

In the decorative sheet 2 of the first embodiment, the transparent sheet 4 is laminated on the decorative layer 3 on the laminate layer 9 side, and the backer sheet 5 is laminated on the printing raw fabric 6 side. The laminate is oriented so that the surface of the resin molded product 1 and the backer sheet 5 are in contact with each other.
FIG. 2 is a diagram showing a second embodiment of the present invention. The decorative sheet 2 of the second embodiment is a state in which the transparent sheet 4 is laminated on the printing raw fabric 6 side of the decorative sheet 3 and the backer sheet 5 is laminated on the laminate layer 9 side. Furthermore, it laminates | stacks so that the surface of the resin molded product 1 and the sheet | seat 5 for backers may contact | connect.

  In the first and second embodiments described above, the printing stock 6 can be formed of a thermoplastic resin such as a vinyl chloride resin, a polyolefin resin, an acrylic copolymer resin, or a polyester resin. Vinyl chloride resin is not preferable from the viewpoint of the environmental load described above. Furthermore, among these thermoplastic resins, polyolefin resins are preferable because they have appropriate flexibility, chemical resistance, post-processing properties, etc. required for a decorative sheet and are provided at low cost.

  Examples of the polyolefin resin include polyethylene, polypropylene, polybutene, polyisoprene, ethylene-propylene copolymer, ethylene-vinyl acetate copolymer, ethylene-α-olefin copolymer, propylene-α-olefin copolymer, ethylene. -Ethyl acrylate copolymer, those obtained by acid modification for the purpose of improving adhesiveness, or ionomer can be selected as appropriate, and may be a single type or a mixture of plural types.

  Of these, polypropylene resins such as homopolypropylene, random polypropylene, block polypropylene, and propylene-α-olefin copolymer are most suitable in terms of flexibility and heat resistance.

  The printing original fabric 6 can be colored by appropriately adding a coloring agent such as an inorganic dye or pigment to the printing original fabric 6 of the decorative sheet 3. In particular, when the decorative sheet requires a concealing property depending on the application, it is preferable to add a concealing pigment to make the printing original fabric 6 concealing. The concealing pigment referred to here is a pigment having a high refractive index compared to the thermoplastic resin as a dispersion medium. From the viewpoint of high refractive index, weather resistance, chemical resistance, etc., for example, a titanium oxide pigment or an oxidation pigment. It is preferable to use at least an inorganic pigment such as an iron pigment. However, as in the case of the second embodiment shown in FIG. 2, when the pattern printing layer 7 is on the resin molded product side, transparency is required for the printing raw fabric 6, so that it is obtained. It is necessary to adjust the concealment property according to design properties.

  There is no restriction | limiting in particular in the manufacturing method of the printing raw fabric 6, It can form into a film by well-known methods, such as a T-die extrusion method, an inflation molding method, and a calender molding method. Moreover, there is no restriction | limiting in particular in the thickness of the printing original fabric 6, Although it is based also on a use or the kind of resin, it is common to select from the range of about 50-200 micrometers.

  The pattern printing layer 7 is provided for the purpose of imparting a desired pattern to a target decorative sheet, and there is no particular limitation on the type of the pattern. For example, a grain pattern, a stone pattern, an abstract pattern, a single color Various patterns similar to those in the case of a conventional decorative sheet, such as plain fabric, can be employed. There are no particular restrictions on the constituent material and the formation method of the pattern printing layer 7, and for example, a colorant such as an organic or inorganic dye or pigment is dissolved or dispersed in an appropriate solvent together with an appropriate binder resin. The printing ink or the coating agent can be provided by printing or coating by an appropriate printing method or coating method.

  Examples of the colorant include inorganic pigments such as carbon black, titanium white, zinc white, dial, bitumen, cadmium red, azo pigments, lake pigments, anthraquinone pigments, phthalocyanine pigments, isoindolinone pigments, dioxazine pigments, and the like. Luminous pigments such as organic pigments, metal pigments made of scale-like foil pieces such as aluminum and titanium, titanium oxide-coated mica, pearl pigments made of scale-like foil pieces such as shells, etc., or a mixture of two or more selected from these Can be used.

The number of prints of the pattern print layer 7 is not particularly limited, and can be appropriately selected for desired design expression, but in order to obtain high designability by providing an uneven pattern inside. It is preferable to have a pattern printing layer using at least the glitter pigment.
Examples of the binder resin include acrylic resins, styrene resins, polyester resins, urethane resins, polyvinyl resins, alkyd resins, petroleum resins, ketone resins, epoxy resins, and melamine resins. , Various synthetic resins such as fluorine-based resins, silicone-based resins, fiber derivatives, and rubber-based resins, or a mixture or copolymer of two or more thereof can be used.

  Examples of the solvent include petroleum organic solvents such as hexane, heptane, octane, toluene, xylene, ethylbenzene, cyclohexane, methylcyclohexane, ethyl acetate, butyl acetate, 2-methoxyethyl acetate, and 2-ethoxyacetate. Ester-based organic solvents such as ethyl, alcohol-based organic solvents such as methyl alcohol, ethyl alcohol, normal propyl alcohol, isopropyl alcohol, isobutyl alcohol, ethylene glycol, propylene glycol, and ketone-based organics such as acetone, methyl ethyl ketone, methyl isobutyl ketone, and cyclohexanone Solvents, ether-based organic solvents such as diethyl ether, dioxane, and tetrahydrofuran; salts such as dichloromethane, carbon tetrachloride, trichloroethylene, and tetrachloroethylene It can be used various organic solvents such systems an organic solvent, an inorganic solvent such as water, or two or more mixed solvents thereof.

There is no particular limitation on the method for forming the pattern print layer 7. For example, various conventionally known printing methods such as gravure printing, offset printing, screen printing, flexographic printing, electrostatic printing, and inkjet printing are used. can do.
As a method for forming the concavo-convex pattern 8 on the surface of the printing original fabric 6 including the pattern printing layer 7, a known method such as hot-press embossing can be used, and it is not particularly limited. The concavo-convex pattern 8 can be formed by applying heat or pressure using. Specifically, a desired shape can be imparted by pressing and cooling an embossed plate or embossing roll made of metal or resin having irregularities in a state in which the printing original fabric 6 is heated and softened. The heating temperature of the embossed plate is preferably about 130 ° C., although it depends on the constituent material such as resin forming the printing original fabric 6. Thereby, a decorative sheet will be in the state heated to about 50-100 degreeC.

  Regarding the shape of the embossed plate, there is no particular limitation on the type of uneven pattern, and for example, it may be various patterns such as woodgrain, stone, Japanese paper, cloth, and geometric patterns, It may be matte, grainy, hairlined, suede or the like. In particular, the concavo-convex pattern is composed of a plurality of parallel straight lines or curved stripe patterns with fine intervals as one unit, and the stripe directions of adjacent unit stripe patterns are combined to be different from each other. In the case of a shape, it is possible to express a unique design feeling that varies depending on the viewing angle. Moreover, when it uses in combination with the wood grain pattern printed with the ink which added the luster pigment, the realistic wood grain feeling of lacquering can be expressed, and it is more preferable. The depth of the unevenness is not particularly limited, but 5 to 100 μm is appropriate for the expression of wood grain feeling, and a height difference of 20 to 70 μm is more preferable.

The laminate layer 9 of the decorative sheet 3 is formed by a melt extrusion laminating method in which a thermoplastic resin is heated and melted and extruded into a film or sheet, and simultaneously laminated and adhered onto the surface of the resin sheet substrate. It is laminated on the uneven surface side of the applied printing original fabric 6. By filling the recesses with a thermoplastic resin by a melt extrusion laminating method, a concavo-convex pattern exists inside the decorative sheet, and a unique design with a three-dimensional feeling can be obtained. By using the melt extrusion laminating method, it is advantageous that the concave portions can be uniformly filled with the thermoplastic resin even with respect to the concave and convex patterns having uneven height differences.

  The material of the laminate layer 9 is preferably a resin of the same system as the printing raw fabric 6. By using a resin of the same system, problems such as peeling due to thermal dimensional changes can be prevented. More specifically, a polypropylene resin is preferable as a resin system used for extrusion lamination in view of performance as a decorative sheet, aptitude for extrusion lamination, fluidity of the resin to the uneven portion, and the like. Moreover, in 1st Embodiment shown in FIG. 1, since resin of the laminate layer 9 is laminated | stacked on the design surface side from the pattern printing layer 7, it has transparency by controlling crystallinity and molding conditions. is required.

  As in the first and second embodiments, by laminating the transparent sheet 4 on the design surface side of the decorative sheet 3, it is possible to impart a further three-dimensional effect and unique design to the decorative sheet. Become. As a material for the transparent resin sheet forming the transparent sheet 4, polyolefin resin, polyester resin, acrylic resin, etc. are used. Among them, acrylic resin from the viewpoint that transparency, surface hardness characteristics and weather resistance can be improved. A transparent thermoplastic sheet using is preferred.

  There is a possibility that a phenomenon called washout (W / O) in which the decorative sheet material melts when the production of a simultaneously decorated molded article by insert molding is studied using a decorative sheet imparted with high designability. This occurs when a high molding pressure and heat are applied to the decorative sheet, particularly in the vicinity of the gate, during the injection molding of the resin molded product 1. In order to suppress this W / O, glass made of a material different from that of the decorative sheet 3 on the surface opposite to the transparent resin sheet forming the transparent sheet 4 (position between the decorative sheet 3 and the resin molded product 1). Resin molding is performed by laminating a thermoplastic resin sheet having a transition temperature of 30 ° C. or higher and a thickness of 0.5 to 5.0 times the thickness of the decorative sheet 3 as the backer sheet 5. It is possible to alleviate the heat and pressure of the molten resin applied to the decorative sheet 3 during the injection molding of the product 1, and as a result, W / O can be improved.

  Examples of the sheet base material for the backer sheet 5 include vinyl chloride resins, polyolefin resins, acrylic copolymer resins, and polyester resins. In view of heat resistance and adhesion to the resin molded product 1, acrylic resin is used. Or polyester based materials are preferred. The selection can be made in consideration of the adhesiveness with the resin molded product 1, but if necessary, in order to obtain the adhesiveness with the molten resin injected into the mold, the backer sheet 5 is used. An adhesive layer (not shown) may be applied.

The lamination method of the decorative sheet 3, the transparent sheet 4, and the backer sheet 5 is not particularly limited. Is possible.
The resin for injection molding is not particularly limited, and a general-purpose injection molding thermoplastic resin can be used, but ABS (acrylonitrile-butadiene-styrene copolymer), assuming automobile interior parts, PC (polycarbonate), alloy resin of PC and ABS, etc. are common. By using the decorative sheet according to the present invention, even when a resin having a high injection molding temperature of 250 to 300 ° C. is used, insert molding is possible without causing problems such as W / O.

Also, the insert molding technique is not particularly limited, and a technique of inserting a pre-shaped decorative sheet in advance by vacuum molding into an injection mold or a decorative sheet directly into an injection mold. The method can be selected in a timely manner depending on the shape of the molded member.

Next, examples and comparative examples of the present invention will be described. The present invention is not limited to these examples.
[Example 1]
Using a polypropylene colored sheet (glass transition temperature −10 ° C., base material thickness 80 μm) obtained by blending an inorganic pigment, an antioxidant, and an antiblocking agent into random polypropylene as a printing stock 6, and obtained by melt extrusion using a T-die, The pattern printing layer 7 was provided by overprinting this sheet and gravure-printing the wood grain pattern including the ink added with the bright pigment of acrylic-vinyl chloride-vinyl acetate copolymer ink manufactured by Toyo Ink Mfg. Co., Ltd.

  Next, on the printing surface side of the pattern printing layer 7, a striped pattern composed of a plurality of parallel straight strips with a fine interval of a maximum depth of 50 μm is taken as one unit, and the strip direction of the strips of adjacent unit striped patterns Using embossing plates formed in such a way that they are different from each other, using an embossing roll device such that the preheating roll 80 ° C., the main drum heater temperature 110 ° C., the slidac heater 110 ° C./160° C./170° C. The embossed plate was heated to 30 ° C. by heating with warm water, and the embossing was performed on the pattern printing layer 7 to give the concavo-convex pattern 8 while feeding the printing original fabric 6 provided with the pattern pattern layer at a line speed of 11 m / min.

  A homopolypropylene resin was laminated as a laminate layer 9 on the concavo-convex surface of the printing original fabric 6 provided with the concavo-convex pattern 8 by a melt extrusion laminating method, and the concavo-convex surface was filled to prepare the decorative sheet 3. Thereafter, an acrylic sheet made of Mitsubishi Rayon: HBS010P (glass transition temperature 100 ° C., substrate thickness 125 μm) is laminated as a transparent sheet 4 on the laminate layer side of the decorative sheet 3 by the dry laminating method, and Cosmo manufactured by Toyobo Co., Ltd. Shine A4300 (glass transition temperature 70 ° C., substrate thickness 100 μm) was used as a backer sheet 5 and laminated on the side opposite to the transparent sheet 4 by a dry laminating method to obtain a decorative molding decorative sheet.

  The decorative molding decorative sheet was heated to 100 ° C., and preliminarily shaped into a shape along the inner surface of the injection mold by vacuum / pressure forming, thereby forming a preform molded body. The prepared preform was set in an injection mold, and a resin was injected onto the backer sheet side to obtain a decorative molded product. As an injection molding resin, an alloy of Nippon A & L made of polycarbonate resin and ABS resin: T105 is used. Injection molding is performed under molding conditions of an injection temperature of 270 ° C., a maximum injection pressure of 200 MPa, a mold temperature of 70 ° C., and an injection rate of 150 cm 3 / sec. The decorative molded product was obtained.

[Example 2]
A polypropylene clear sheet (glass transition temperature −10 ° C., substrate thickness 80 μm) obtained by blending an antioxidant and an anti-blocking agent into random polypropylene as the printing stock 6 and melt-extruding with a T-die is used for this sheet. A pattern printing layer 7 was provided by gravure printing and overprinting, including ink added with a bright pigment of acrylic-vinyl chloride-vinyl acetate copolymer ink manufactured by Toyo Ink Co., Ltd.

Next, on the printing surface side of the pattern printing layer 7, a striped pattern composed of a plurality of parallel straight strips with a fine interval of a maximum depth of 50 μm is taken as one unit, and the strip direction of the strips of adjacent unit striped patterns Using embossing plates formed in such a way that they are different from each other, using an embossing roll device such that the preheating roll 80 ° C., the main drum heater temperature 110 ° C., the slidac heater 110 ° C./160° C./170° C. The embossed plate was heated to 30 ° C. by heating with hot water, and an embossing process was applied on the pattern printing layer 7 to give the concavo-convex pattern 8 while feeding the printing original fabric 6 provided with the pattern pattern layer at a line speed of 11 m / min.

  A homopolypropylene resin was laminated as a laminate layer 9 on the concavo-convex surface of the printing original fabric 6 provided with the concavo-convex pattern 8 by a melt extrusion laminating method, and a decorative sheet was prepared by filling the concavo-convex surface. Thereafter, an acrylic sheet made of Mitsubishi Rayon: HBS010P (glass transition temperature 100 ° C., substrate thickness 125 μm) is laminated as a backer sheet 5 on the laminate layer side of the decorative sheet 3 by the dry laminating method. A decorative sheet for decorative molding was obtained by laminating a rayon acrylic sheet as a transparent sheet 4 on the side opposite to the backer sheet 5 by a dry laminating method.

  The decorative molding decorative sheet was heated to 100 ° C., and preliminarily shaped into a shape along the inner surface of the injection mold by vacuum / pressure forming, thereby forming a preform molded body. The prepared preform was set in an injection mold, and a resin was injected onto the backer sheet side to obtain a decorative molded product. As resin for injection molding, polycarbonate resin: T105 manufactured by Japan A & L is used, and injection molding is performed under the molding conditions of an injection temperature of 270 ° C., a maximum injection pressure of 200 MPa, a mold temperature of 70 ° C., and an injection rate of 150 cm 3 / sec. A molded product was obtained.

[Comparative Example 1]
Using a polypropylene colored sheet (glass transition temperature -10 ° C., substrate thickness 80 μm) obtained by melt extrusion using a T-die, blending an inorganic pigment, an antioxidant, and an anti-blocking agent with random polypropylene as a printing raw material. The sheet was overprinted with a gravure ink added to Toyo Ink Mfg. Co., Ltd.'s acrylic-vinyl chloride gravure ink, and a pattern print layer was provided by gravure printing.

  Next, on the printing surface side of the pattern printing layer, a stripe pattern composed of a plurality of parallel straight stripes with a fine interval of a maximum depth of 50 μm is taken as one unit, and the stripe direction of the stripes between adjacent unit stripe patterns is Using embossing plates formed in different combinations from each other, an embossing roll device having a preheating roll of 80 ° C., a main drum heater temperature of 110 ° C., and a slidac heater of 110 ° C./160° C./170° C. is used. The plate was heated to 30 ° C. by heating with hot water, and an embossing process was performed on the pattern printing layer to give a concavo-convex pattern while feeding out the printing stock provided with the pattern pattern layer at a line speed of 11 m / min.

  A homopolypropylene resin was laminated as a laminate layer on the concavo-convex surface of the printing original fabric provided with the concavo-convex pattern by a melt extrusion lamination method, and a decorative sheet was prepared by filling the concavo-convex surface. Then, on the laminate layer side of the decorative sheet, decorative molding is performed by laminating an acrylic sheet manufactured by Mitsubishi Rayon: HBS010P (glass transition temperature 100 ° C., substrate thickness 125 μm) as a transparent thermoplastic resin sheet by a dry lamination method. A decorative sheet was obtained.

  The decorative molding decorative sheet was heated to 100 ° C., and preliminarily shaped into a shape along the inner surface of the injection mold by vacuum / pressure forming, thereby forming a preform molded body. The prepared preform was set in an injection mold and the resin was injected on the side opposite to the transparent thermoplastic resin sheet to obtain a decorative molded product. As resin for injection molding, polycarbonate resin: T105 manufactured by Japan A & L is used, and injection molding is performed under the molding conditions of an injection temperature of 270 ° C., a maximum injection pressure of 200 MPa, a mold temperature of 70 ° C., and an injection rate of 150 cm 3 / sec. A molded product was obtained.

[Comparative Example 2]
In the decorative sheet 3, a decorative molded product was created in the same process as in Example 1 except that the step of imparting the uneven pattern was omitted.
[Comparative Example 3]
A decorative molded product was prepared in the same process as in Example 1 except that a polyethylene resin sheet having a glass transition temperature of −100 ° C. and a substrate thickness of 50 μm was used as the backer sheet of the decorative decorative decorative sheet.

  As can be seen from the results in Table 1, Examples 1 and 2 obtained according to the present invention are the characteristics of the present invention. It was possible to provide a decorative sheet and a decorative molded product in which the change in the design of the decorative sheet was improved.

DESCRIPTION OF SYMBOLS 1 ... Resin molded product 2,10 ... Cosmetic sheet 3 ... Decorating sheet 4 ... Transparent sheet 5 ... Backer sheet 6 ... Original printing material 7 ... Pattern printing layer 8 ... Uneven pattern 9 ... Laminate layer

Claims (10)

  A decorative sheet for adding decoration to the surface of a resin molded product, a transparent sheet laminated on the surface of the decorative sheet, and a laminated sheet on the back surface of the decorative sheet opposite to the transparent sheet A decorative sheet in which the transparent sheet and the backer sheet are made of a thermoplastic resin, and the decorative sheet is formed into a sheet shape from a thermoplastic resin different from the backer sheet. A printed original fabric, a pattern printing layer formed on one surface of the printing original fabric, and an uneven pattern formed by processing the surface of the printing original fabric including the pattern printing layer into an irregular shape. And a laminate layer for laminating the surface of the concavo-convex pattern with a resin equivalent to the printing raw fabric, and the decorative sheet is formed by insert molding on the surface of the resin molded product via the backer sheet. Decorative sheet characterized in that it is laminated.   The decorative sheet according to claim 1, wherein the printing original fabric is formed by blending a luster pigment with a thermoplastic resin different from the backing sheet.   The decorative sheet according to claim 1, wherein the pattern printing layer is made of ink containing a bright pigment.   The concavo-convex pattern has a striped pattern composed of a plurality of parallel straight lines or curved strips with fine intervals as one unit, and is combined so that the strip directions of adjacent unit striped patterns are different from each other. It is a shape, The decorative sheet as described in any one of Claims 1-3 characterized by the above-mentioned.   The backer sheet is a thermoplastic resin having a thickness of 0.5 to 5.0 times the thickness of the decorative sheet and having a glass transition temperature of 30 ° C. or more higher than the original printing sheet. The decorative sheet according to claim 1, wherein the decorative sheet is formed of   The decorative sheet according to any one of claims 1 to 5, wherein the printing original fabric is formed from a polyolefin-based resin, and the transparent sheet is formed from a transparent acrylic resin.   The said printing original fabric is formed from polyolefin resin, the said transparent sheet is formed from transparent acrylic resin, and the said sheet | seat for backers is formed from acrylic resin, The any one of Claims 1-6 characterized by the above-mentioned. The decorative sheet according to claim 1.   The said printing original fabric is formed from polyolefin resin, the said transparent sheet is formed from transparent acrylic resin, and the said sheet | seat for backers is formed from the polyester-type resin, Any one of Claims 1-6 characterized by the above-mentioned. The decorative sheet according to claim 1.   The decorative sheet according to any one of claims 1 to 8, wherein the pattern printing layer is formed by printing a wood grain pattern on a surface of the printing original fabric.   A decorative sheet comprising: a resin molded product; and a decorative sheet for decorating the surface of the resin molded product simultaneously with injection molding of the resin molded product, wherein the decorative sheet is described in any one of claims 1 to 9 Decorative molded product characterized by being.

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