WO2005030481A1 - 加飾シート、加飾成形品、及び射出成形同時加飾方法 - Google Patents
加飾シート、加飾成形品、及び射出成形同時加飾方法 Download PDFInfo
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- WO2005030481A1 WO2005030481A1 PCT/JP2004/009426 JP2004009426W WO2005030481A1 WO 2005030481 A1 WO2005030481 A1 WO 2005030481A1 JP 2004009426 W JP2004009426 W JP 2004009426W WO 2005030481 A1 WO2005030481 A1 WO 2005030481A1
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- sheet
- transparent resin
- decorative
- resin base
- molded product
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B3/00—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar form; Layered products having particular features of form
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/14—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/14—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles
- B29C45/14778—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles the article consisting of a material with particular properties, e.g. porous, brittle
- B29C45/14811—Multilayered articles
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/26—Moulds
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/26—Moulds
- B29C45/263—Moulds with mould wall parts provided with fine grooves or impressions, e.g. for record discs
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- B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
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- B32B27/18—Layered products comprising a layer of synthetic resin characterised by the use of special additives
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- B32B27/304—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers comprising vinyl halide (co)polymers, e.g. PVC, PVDC, PVF, PVDF
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- B32B27/306—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers comprising vinyl acetate or vinyl alcohol (co)polymers
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- B32B27/30—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers
- B32B27/308—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers comprising acrylic (co)polymers
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- B32B27/322—Layered products comprising a layer of synthetic resin comprising polyolefins comprising halogenated polyolefins, e.g. PTFE
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- B32B3/26—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar form; Layered products having particular features of form characterised by a particular shape of the outline of the cross-section of a continuous layer; characterised by a layer with cavities or internal voids ; characterised by an apertured layer
- B32B3/263—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar form; Layered products having particular features of form characterised by a particular shape of the outline of the cross-section of a continuous layer; characterised by a layer with cavities or internal voids ; characterised by an apertured layer characterised by a layer having non-uniform thickness
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- B32B3/26—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar form; Layered products having particular features of form characterised by a particular shape of the outline of the cross-section of a continuous layer; characterised by a layer with cavities or internal voids ; characterised by an apertured layer
- B32B3/28—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar form; Layered products having particular features of form characterised by a particular shape of the outline of the cross-section of a continuous layer; characterised by a layer with cavities or internal voids ; characterised by an apertured layer characterised by a layer comprising a deformed thin sheet, i.e. the layer having its entire thickness deformed out of the plane, e.g. corrugated, crumpled
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B44—DECORATIVE ARTS
- B44C—PRODUCING DECORATIVE EFFECTS; MOSAICS; TARSIA WORK; PAPERHANGING
- B44C5/00—Processes for producing special ornamental bodies
- B44C5/04—Ornamental plaques, e.g. decorative panels, decorative veneers
- B44C5/0453—Ornamental plaques, e.g. decorative panels, decorative veneers produced by processes involving moulding
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2995/00—Properties of moulding materials, reinforcements, fillers, preformed parts or moulds
- B29K2995/0018—Properties of moulding materials, reinforcements, fillers, preformed parts or moulds having particular optical properties, e.g. fluorescent or phosphorescent
- B29K2995/0026—Transparent
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- B32B2250/00—Layers arrangement
- B32B2250/24—All layers being polymeric
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- B32B2264/00—Composition or properties of particles which form a particulate layer or are present as additives
- B32B2264/10—Inorganic particles
- B32B2264/102—Oxide or hydroxide
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- B32B2264/00—Composition or properties of particles which form a particulate layer or are present as additives
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- B32B2264/104—Oxysalt, e.g. carbonate, sulfate, phosphate or nitrate particles
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- B32B2307/40—Properties of the layers or laminate having particular optical properties
- B32B2307/402—Coloured
- B32B2307/4023—Coloured on the layer surface, e.g. ink
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
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- Y10T428/24355—Continuous and nonuniform or irregular surface on layer or component [e.g., roofing, etc.]
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
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- Y10T428/24479—Structurally defined web or sheet [e.g., overall dimension, etc.] including variation in thickness
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- Y10T428/24529—Structurally defined web or sheet [e.g., overall dimension, etc.] including variation in thickness with component conforming to contour of nonplanar surface and conforming component on an opposite nonplanar surface
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
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- Y10T428/24479—Structurally defined web or sheet [e.g., overall dimension, etc.] including variation in thickness
- Y10T428/24612—Composite web or sheet
Definitions
- the present invention relates to a decorative sheet having a three-dimensional design effect of a concavo-convex pattern, a decorative molded product using the same, and a simultaneous injection molding decorative method for molding a decorative molded product.
- Decorative molded products decorated by integrating a decorative sheet on the surface of a resin molded product as an adherend are used for various purposes.
- a typical method of obtaining such a decorative molded product is a simultaneous injection molding decorative method in which a decorative sheet is laminated and integrated at the same time as molding a resin molded product (see Patent Literature 1-16 below).
- An uneven pattern for shaping is provided on the cavity surface of the injection mold, and the uneven pattern is formed on the surface of the decorative molded product (decorative sheet surface) after injection molding.
- a resin sheet made of a thermoplastic resin such as an acrylic resin is used as a base sheet of the decorative sheet, and the base sheet is embossed by applying heat and pressure to form an uneven pattern. Use a decorative sheet.
- the uneven pattern is expressed by printing such as screen printing.
- the decorative sheet is given an uneven pattern by embossing printing with curable resin ink such as ultraviolet curable resin.
- curable resin ink such as ultraviolet curable resin.
- an ionizing radiation-curable resin ink is filled into at least a concave portion of a roll intaglio (also referred to as a shaping plate, a molding plate cylinder, or the like), and a resin sheet is brought into contact with the ink.
- the ink is cured by irradiating it with ionizing radiation while being held in between. Thereafter, by peeling the resin sheet from the roll intaglio, an uneven pattern composed of a cured product of the ink is provided on the resin sheet (see Patent Literature 3, Patent Literature 4, Patent Literature 5, Patent Literature 6, etc.).
- Patent Document 1 Japanese Patent Publication No. 50-19132
- Patent Document 2 Japanese Patent Publication No. 43-27488
- Patent Document 3 JP-A-57-87318
- Patent Document 4 Japanese Patent Publication No. 57-22755
- Patent Document 5 JP-B-63-50066
- Patent Document 6 JP-A-7-32476
- the above methods (1)-(4) have the following disadvantages. That is, in the method (1) of embossing with an injection mold during injection molding of a molded product, the embossed surface is limited to the surface of the molded product. Therefore, an uneven pattern cannot be provided inside. Since it is necessary to make the cavity surface of the injection mold a concave and convex surface as a shaping die, when changing the design of the concave-convex pattern, even if the shape of the molded product is the same, expensive injection molding is required. The entire mold had to be replaced, and the uneven pattern could not be freely changed.
- the decorative sheet is preliminarily prepared in a vacuum forming step prior to the injection molding step. During molding, there was a problem that the uneven shape of the embossed pattern was restored by the heat of preforming the decorative sheet.
- a concavo-convex pattern having a more excellent three-dimensional appearance is formed as compared with the printing method of (3). It can.
- the uneven pattern is hardened and formed by irradiating ultraviolet rays from the resin sheet side, so that the uneven pattern cannot be provided unless a transparent sheet is used for the resin sheet.
- a decorative layer is formed on a decorative sheet by ordinary printing, if a concavo-convex pattern is provided before printing, printing defects such as printing omission during printing are likely to occur due to the concavo-convex pattern.
- the present invention includes a transparent resin substrate sheet and a glittering layer provided on the back surface of the transparent resin substrate sheet, and the surface of the transparent resin substrate sheet has a relatively glossy high gloss region.
- the transparent resin substrate sheet is relatively thick in the high gloss area and relatively thin in the low gloss area.
- a decorative sheet characterized by visually exhibiting a concavo-convex pattern corresponding to the thickness of the high gloss region and the thickness of the low gloss region.
- a high-low gloss area on the surface and the corresponding concave and convex inside the sheet can provide a three-dimensional design that visually feels an uneven pattern.
- the present invention is a decorative sheet characterized in that a decorative layer is provided between the transparent resin base sheet and the glitter layer so as not to completely hide the glitter of the glitter layer.
- the present invention is a decorative sheet characterized in that a backing sheet made of a thermoplastic resin is provided on the back surface of the glittering layer.
- the decorative sheet By adopting such a structure, if the total thickness of the decorative sheet as a whole is insufficient without a backing sheet in terms of use, formability, design, etc., the decorative sheet can be used with this backing sheet. The total thickness can be compensated. Further, when the layer on the back side of the decorative sheet has insufficient adhesion with the resin molded product or the like as the adherend of the decorative sheet, the adhesion of the resin molded product or the like with the adherend is insufficient.
- the backing sheet is made of a good resin to improve the adhesion.
- the present invention is characterized in that, on the back surface of the transparent resin substrate sheet, a portion corresponding to the high gloss region is provided with a protruding portion projecting toward the back surface direction. It is a sheet.
- the transparent resin base sheet includes a first transparent resin base sheet located on the front side and a second transparent resin base sheet located on the back side, and the first transparent resin base
- the second transparent resin base sheet is made of an amorphous resin, and the melting point of the first transparent resin base sheet is higher than the softening temperature of the second transparent resin base sheet.
- the decorative sheet when the decorative sheet is heat-formed, such as by simultaneous injection molding and decorating method, the high gloss area and the low gloss area given as the presence or absence of minute irregularities on the surface disappear during the heat molding. It can also satisfy the moldability (or shape followability) of the decorative sheet. That is, when embossing is performed on the transparent resin substrate sheet including the fine irregularities by embossing, the embossing is performed at a temperature equal to or higher than the melting point of the first transparent resin base sheet. By performing the heat molding at a temperature lower than the melting point of the first transparent resin base material and equal to or higher than the softening temperature of the second transparent resin base sheet, both the maintenance of the irregularities and the moldability can be achieved. As a result, when the simultaneous decorating method by injection molding is performed, even after the vacuum forming step of the decorative sheet and even after the injection molding step, the visual three-dimensional design feeling of the uneven pattern involving the unevenness does not disappear.
- the present invention relates to a decorative molded article comprising a decorative sheet and a resin molded article provided on the back side of the decorative sheet, wherein the decorative sheet comprises a transparent resin base sheet, a transparent resin base, A glossy layer provided on the back side of the material sheet, and the surface of the transparent resin substrate sheet is divided into a relatively high gloss area and a relatively low gloss area with relatively high gloss.
- the thickness of the resin base sheet is relatively thick in the high-gloss area and relatively thin in the low-gloss area. This is a decorative molded product characterized by visually expressing the appearance.
- the present invention is a decorative molded article characterized in that a protruding portion is provided on a back surface and a front surface is a flat surface in a high gloss region of a transparent resin substrate sheet.
- the present invention is a decorative molded product, characterized in that a protruding portion is provided on the back surface and a convex shape is provided on the front surface side in a high gloss region of the transparent resin substrate sheet.
- This configuration also clearly shows an example of a specific configuration for making the thickness of the transparent resin base material sheet in the decorative sheet portion relatively thicker in the high gloss area on the surface than in the low gloss area. .
- the shape of the surface portion of the high gloss region and the pseudo unevenness due to the visual effect are compatible with each other, so that a three-dimensional design feeling that visually senses the uneven pattern can be obtained.
- the present invention provides an injection molding simultaneous decorating method for obtaining a decorative molded product by integrally providing a decorative sheet on the surface of the resin molded product when molding the resin molded product.
- the laminate including the material sheet and the glittering layer is heated, the laminate is embossed, and the surface of the transparent resin base material sheet has a relatively high gloss area and a relatively low gloss area.
- the effect of the decorative sheet for visually perceiving the concavo-convex pattern can be enjoyed by the simultaneous injection molding and decorative method, and this effect can also be obtained in the obtained decorative molded product. Can be enjoyed.
- the transparent resin base sheet of the laminate includes a first transparent resin base sheet located on the front side and a second transparent resin base sheet located on the back side.
- the transparent resin base sheet is made of a crystalline resin
- the second transparent resin base sheet is made of an amorphous resin
- the melting point of the first transparent resin base sheet is lower than that of the second transparent resin base sheet.
- the present invention is the simultaneous injection molding and decorating method, wherein embossing is performed at a temperature equal to or higher than the melting point of the first transparent resin base sheet in the sheet manufacturing step.
- the present invention is characterized in that in the vacuum forming step, vacuum forming is performed at a temperature equal to or higher than the softening point of the second transparent resin base sheet and lower than the melting point of the first transparent resin base sheet. It is a decoration method.
- the transparent resin substrate sheet is made of a specific two-layer laminate, the effect of visually perceiving the concavo-convex pattern can be ensured by the injection molding simultaneous decoration method ( And a decorative molded product obtained thereby). Therefore, even in the vacuum forming step and even after the injection forming step, the visual three-dimensional design feeling of the uneven pattern at the decorative sheet stage does not disappear.
- the decorative sheet of the present invention even when the surface is flat, it is possible to obtain a three-dimensional design that visually gives an uneven pattern. Further, if the decorative layer is provided between the transparent resin substrate sheet and the glittering layer, higher design properties can be obtained. Further, if the backing sheet is provided on the back surface of the glittering layer, it is possible to secure the total thickness of the decorative sheet and to improve the adhesion to the adherend such as a resin molded product.
- the sheet thickness of that portion is relatively thicker than other portions, so that Even if the surface is flat, a three-dimensional design that gives a visual impression of unevenness can be obtained.
- a decorative molded article that allows the user to visually feel an uneven pattern is obtained.
- the decorative sheet to be used is a transparent resin base sheet having a specific two-layer laminate, the visual three-dimensional design feeling of the uneven pattern at the decorative sheet stage will not be lost. .
- FIG. 1A to FIG. 1C are cross-sectional views illustrating some embodiments of the decorative sheet of the present invention.
- FIG. 2 is a cross-sectional view illustrating another embodiment of the decorative sheet of the present invention.
- FIG. 3 is a cross-sectional view illustrating another embodiment of the decorative sheet of the present invention.
- FIG. 4A is a cross-sectional view illustrating one embodiment of a decorative molded product of the present invention.
- FIG. 4B is an enlarged view of a portion B of FIG. 4A.
- FIG. 5A to FIG. 5B are cross-sectional views illustrating a method for forming a high / low gloss region on the surface of a transparent resin base material sheet and a corresponding projection on the back surface.
- FIG. 6A to FIG. 6C are conceptual views illustrating a simultaneous injection molding decorating method according to the present invention.
- FIG. 1 is a cross-sectional view illustrating three examples of the basic configuration of the decorative sheet S of the present invention.
- the caro-decoration sheets Sl, S2, S3, and S4 of various forms are collectively referred to as caro-decoration sheets Sn (n is an integer) such as S4.
- the decorative sheet S1 shown in FIG. 1A includes a transparent resin base sheet 1 and a glittering layer 2 provided on the back surface of the transparent resin base sheet 1.
- the surface of the transparent resin base material sheet 1 has a low gloss area L which has a relatively lower gloss (for example, matte) than the surroundings, and a high gloss which has a relatively higher gloss (for example, gloss) than the surroundings.
- the area is defined by the glossy area H (Hf).
- the surface of the high-gloss region H is a flat surface, which is represented as a high-gloss region Hf.
- the thickness of the transparent resin substrate sheet 1 is such that the thickness of the high gloss region Hf is relatively thick and the thickness of the low gloss region L is relatively thin.
- the back surface of the transparent resin base material sheet 1 protrudes toward the back surface, and a projection p is formed.
- the surface of the transparent resin substrate sheet 1 is flat in the low gloss region L.
- FIGS. 1A to 1C there are three shapes of the high gloss region H as shown in the cross-sectional views of FIGS. 1A to 1C. That is, as shown in FIG. 1A, which has already been described, a flat shape (high gloss region Hf), a concave shape (recess) as shown in FIG. IB (high gloss region Hr), or a convex shape (protrude region) as shown in FIG. 1C. ) (High gloss area Hp).
- these high gloss regions Hf, Hr, and Hp are collectively referred to simply as a high gloss region H.
- front surface and back surface mean that “front surface” refers to the direction of the transparent resin base material sheet 1 side of the decorative sheet S (the observer side of the decorative sheet).
- Direction 1A to 1C, the upper side is the surface side.
- the “back side” means the direction toward the glittering layer 2 of the decorative sheet (the direction opposite to the observer side of the decorative sheet, which is also the direction of the adherend).
- Figure 1A In FIG. 1C, the lower side is the back side.
- the decorative sheet of the present invention may further include a decorative layer 3 between the transparent resin base sheet 1 and the glittering layer 2 as shown in FIG.
- a backing sheet 4 may be provided on the back surface of the brilliant layer 2, or an adhesive layer may be provided on the outermost back surface for imparting adhesiveness to an adherend (not shown).
- the decorative layer 3, the backing sheet 4, and the adhesive layer are basically provided as needed, and may be formed by only one layer or a combination of two arbitrary layers. You can do it.
- an injection molding simultaneous decoration method of the present invention there is an injection molding simultaneous decoration method of the present invention.
- the simultaneous decorating method by injection molding it is preferable to employ a decorative sheet in which the transparent resin base sheet is a specific two-layer laminate. This is because the three-dimensional design of the embossed pattern using the embossing process at the stage of making the decorative sheet can be reliably applied to the decorative molded product so that it does not disappear even after the vacuum forming process and the injection molding process. This is because it can be granted.
- embossing of the decorative sheet is performed at a temperature equal to or higher than the melting point of the first transparent resin base sheet, so that the embossing of the decorative sheet can be performed at the same time.
- the decorating vacuum forming step it is performed at a temperature equal to or higher than the softening temperature of the second transparent resin base sheet and lower than the melting point of the first transparent resin base sheet.
- the transparent resin substrate sheet 1 is made of transparent thermoplastic resin, which is transparent, suitable for embossing, and the decorative sheet is heated and softened to form a mold such as vacuum forming. It should be selected in consideration of compatibility between molding suitability and durability of embossing (prevention of emboss loss).
- thermoplastic resin for example, polyethylene, polypropylene, Polyolefin resins such as polymethylpentene, polybutene, and olefin thermoplastic elastomers, polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, terephthalic acid-isophthalic acid-ethylene glycol copolymer, terephthalic acid-ethylene glycol -1,4-cyclohexanedimethanol copolymer, polyester resin such as polyester thermoplastic elastomer, polyamide resin such as nylon 6, nylon 9, nylon 6,6, etc., polyvinyl fluoride, polyvinylidene fluoride, etc.
- fluorine-based resins such as poly-3fluoroanilide, ethylene-4fluoroethylene copolymer, polytetrafluoroethylene, and the like, acrylic resins, polychloroanilide, polystyrene, polycarbonate resins, and the like.
- acrylic resin for example, polymethyl (meth) acrylate, polyester (meth) acrylate, polybutyl (meth) acrylate, methyl (meth) acrylate-butyl (meth) acrylate, Polymers, resins such as ethyl (meth) acrylate-butyl (meth) acrylate copolymer, methyl (meth) acrylate-styrene copolymer (provided that (meth) acrylate is acrylate or methacrylate) Meaning] is used alone or as a mixture of two or more.
- Thickness The thickness (total thickness in the case of a laminate structure) of the transparent resin substrate sheet is about 50 to 400 / m.
- the transparent resin substrate sheet can optionally add additives as needed.
- additives appropriate amounts of various additives can be added as long as the thermal behavior such as transparency, surface gloss and melting point is not hindered.
- ultraviolet absorbers such as benzotriazole and benzophenone
- light stabilizers such as hindered amine radical scavengers
- lubricants such as silicone resins and waxes
- coloring agents plasticizers
- heat stabilizers antibacterial agents
- fungicides Agents antistatic agents and the like can be added.
- the layer configuration of the transparent resin substrate sheet may be either a single layer or a laminate in which two or more layers of different resins are laminated.
- the decorative sheet is applied to a heating process such as a vacuum forming method or a simultaneous decorating method of injection molding in a mold
- the transparent resin substrate sheet 1 is formed by the moldability of the transparent resin substrate sheet itself. (Or shape followability) and the contradictory conditions of preventing the disappearance of the high gloss area and the low gloss area obtained by forming minute irregularities on the surface.
- a transparent resin base material sheet 1 has a first transparent resin base material sheet 11 located on the front side and a second transparent resin base sheet 11 located on the back side.
- the resin substrate sheet 12 has a two-layer structure, the first transparent resin substrate sheet 11 is a crystalline resin having a melting point, and the second transparent resin substrate sheet 12 is a non-crystalline resin having no melting point. I do.
- the melting point of the first transparent resin substrate sheet is higher than the softening temperature of the second transparent resin substrate sheet.
- the softening temperature is based on the VICAT softening temperature (standard DIN-ENTW. 53, 460).
- the transparent resin substrate sheet 1 having a specific temperature physical property as described above and having a two-layer structure, when forming irregularities on the surface of the transparent resin substrate sheet 1 by embossing, particularly, embossing is performed by heating minute irregularities.
- embossing is performed at a temperature equal to or higher than the melting point of the first transparent resin base material sheet.
- the crystalline resin of the first transparent resin base material sheet 11 is melted into its crystalline structure to form an uneven shape.
- the temperature is lowered after embossing, the resin is recrystallized and becomes uneven. The shape is fixed.
- the decorative sheet is heated again during heat molding such as vacuum forming of simultaneous injection molding decoration, the first transparent resin base sheet 1
- the crystal structure is maintained, and the formability of the decorative sheet as a whole is made of an amorphous resin.
- the second transparent resin base sheet 12 is secured mainly, and the shape of the fine irregularities is easily maintained.
- the adherend 5 flows in the decorative sheet itself or in an adhesive for adhering to the adherend.
- the decorative sheet is preformed into a molded product by vacuum forming.
- the decorative sheet front side is pressed against the vacuum forming die side, but the unevenness on the back side is in a free state, so that the disappearance of the unevenness on the back side can be prevented.
- the decorative sheet is pressed on the surface of the injection molding die, but the irregularities on the back side are filled with the injection resin in a flowing state. It is held in the resin molding.
- the temperature applied to the decorative sheet is in the range of 100 to 170 ° C.
- Use resin VICAT softening temperature 120 ° C for polymethyl (meth) acrylate
- polycarbonate resin VICAT softening temperature 155 ° C
- polystyrene VICAT softening temperature 103 ° C.
- a fluororesin such as polyvinylidene fluoride (melting point of 160 ° C. or more), polytetrafluoroethylene (melting point of 327 ° C), polytetrafluoroethylene (melting point of 205 to 220 ° C.) is used. .
- the embossing temperature is set at a temperature equal to or higher than the melting point of the first transparent resin base sheet 11
- the vacuum forming temperature is set lower than the melting point of the first transparent resin base sheet 11
- a fluororesin (more specifically, for example, vinylidene fluoride resin) is used.
- a configuration in which an acrylic resin is used for the first transparent resin base sheet 12 and an acrylic resin is used for the second transparent resin base sheet 12 is one of preferred configurations.
- vinylidene fluoride resin is particularly preferable from the viewpoint of not being too high in cost and having an appropriate melting point.
- acryl resins are preferred because they have a tendency to broaden the molding temperature range during sheet heating, and are also preferred because of their excellent weather resistance and transparency.
- the heating temperature of the decorative sheet during vacuum forming (including vacuum pressure forming) as preforming in the simultaneous injection molding and decorating method is determined by injection molding using a vacuum forming die as an injection molding die.
- the heating temperature of the decorative sheet is 140 to 170 ° C in the case of off-line preforming in which vacuum forming is performed separately from the injection molding die, that is, outside the injection molding machine. Therefore, from these viewpoints, the resin of the first transparent resin substrate sheet has a melting point of 120 ° C or higher, preferably 130 ° C or higher if limited to in-line preforming, including offline preforming. If considered, it is preferable to select a resin having a temperature of 150 ° C. or higher or 170 ° C. or higher.
- the thickness of the first transparent resin base material sheet 11 may be determined according to the depth of the concavo-convex shape for making the surface low gloss.
- the vacuum formability of the decorative sheet as a whole Other layers such as the transparent resin base sheet 12 can play a major role. Therefore, the thickness of the first transparent resin substrate sheet 11 is usually smaller than the thickness of the second transparent resin substrate sheet 12.
- a specific example of the thickness of the first transparent resin base material sheet 11 is about 5-50 ⁇ .
- the second transparent resin base sheet 12 is a layer for ensuring vacuum formability as a decorative sheet and for providing irregularities on the back side of the transparent resin base sheet.
- the second transparent resin base sheet 12 is a layer that mainly plays a role of the total thickness as a decorative sheet more than the first transparent resin base sheet 11. Therefore, a resin having better vacuum moldability than the first transparent resin base sheet 11 is used for the second transparent resin base sheet 12.
- the thickness of the second transparent resin substrate sheet 12 is usually larger than the thickness of the first transparent resin substrate sheet 11.
- a specific example of the thickness of the second transparent resin base material sheet 12 is about 50 to 200 ⁇ m.
- the relationship between the thickness of the first transparent resin substrate sheet 11 and the thickness of the second transparent resin substrate sheet 12 is not limited to this.
- the resin base sheets 11 and 12 may be laminated via an adhesive.
- the transparent resin base sheets 11 and 12 are formed by co-extrusion of two layers, or one is prepared in advance with a resin fill and the other is melt-extruded and coated thereon.
- the first and second transparent resin base sheets 11 and 12 may be formed.
- a two-layer coextrusion or melt extrusion coating a thin transparent resin base sheet that cannot be formed by laminating the first and second transparent resin base sheets 11 and 12 can be formed.
- two-layer co-extrusion is more preferable in that the first and second transparent resin substrate sheets 11 and 12 can be adhered to each other.
- High gloss area and low gloss area The surface of the transparent resin substrate sheet 1 is divided into two types of high gloss areas H and low gloss L having relatively different gloss.
- the thickness of the transparent resin substrate sheet 1 corresponding to the high gloss region H and the low gloss region L, and the visual irregularities due to the irregularities on the back surface of the light-reflective interface between the transparent resin substrate sheet 1 and the glittering layer 2 You can get the feeling.
- a pattern formed in correspondence with the high gloss area H and the low gloss area L (this pattern is called an uneven pattern because it has a visual unevenness) is used in the required design expression.
- the uneven pattern is, for example, wood grain conduit groove, wood grain year These include ring patterns, grain, pearskin, hair lines, parallel grooves, irregularities on the cleavage surface of granite, surface texture of cloth, squeezing, joint grooves for tiled and brickwork, characters, geometric patterns, etc.
- an area in which a concave portion is to be visually expressed in appearance is made to correspond to the high gloss area H
- an area in which a convex part is to be visually expressed is made to correspond to the low gloss area L.
- a technique in which a pseudo uneven pattern is felt by the glossy pattern of the surface Only the application is applied, and the visual interaction between the glittering layer on the back surface of the transparent resin base sheet and the thickness difference of the transparent resin base sheet as in the present invention is not used. different.
- the high gloss region H corresponds to the convex portion
- the low gloss region L corresponds to the concave portion
- the level of the gloss is completely opposite to that of the present invention.
- the gloss difference between the high gloss area H and the low gloss area L may be such that the gloss difference can be visually recognized.
- the specular gloss Gs (60 °) of 60 degrees specified in JIS Z8741 is 5 or more, more preferably 20 or more.
- the low gloss area L has a relatively rough surface due to the formation of fine irregularities, compared to the high gloss area H, and the high gloss area H has relatively higher surface smoothness than the low gloss area L.
- the surface roughness of the surface of the transparent resin base material sheet 1 is adjusted so that the center line average roughness Ra specified in JIS B0601 is less than 1 ⁇ m and the mirror gloss Gs (60 ° ) Is 80 or more.
- the center line average roughness Ra of the surface of the transparent resin substrate sheet 1 is 4 / im or more
- the specular gloss Gs (60 °) is 40 or less. .
- the difference in the degree of the fine irregularities (rough surface) for providing a difference in gloss as described above can be formed by a known method, for example, embossing.
- Thickness difference The thickness of the transparent resin base material sheet 1 is formed so as to be relatively thick in the high gloss area H and thin in the low gloss area L. The difference in thickness due to this is usually about 10 to 100 zm.
- the interface between the transparent resin substrate sheet 1 and the glittering layer 2 also referred to as a light-reflecting interface
- the shape of the protruding portion p is preferably a curve having at least a cross-sectional shape protruding in the back surface direction.
- the vertical cross-sectional shape may be a curve that becomes convex in the back direction, or another shape such as a straight line that becomes convex in the back direction.
- the light-reflective interface functions like a concave mirror, and once converges the illumination light to the focal point (focal line). Later, emanate from it. Therefore, the depth and shape of the protruding portion p appear to be brighter and emphasized.
- the depth and shape of the protruding portion can be set to be higher than that of the surrounding area by making the high gloss area H immediately above the protruding part and the relatively low gloss area L around the protruding part. The effect is also emphasized. As a result, even if the surface of the transparent resin base material sheet 1 is flat or slightly protruded, a sufficient unevenness is visually reproduced.
- the transparent resin base sheet 1 is formed with the high gloss areas H and low gloss areas L and the rear projections p synchronized with these areas.
- a conventionally known shaping method such as an embossing method may be appropriately adopted.
- the transparent resin base sheet is composed of a first transparent resin base sheet 11 made of a crystalline resin and a second transparent resin base sheet 12 made of an amorphous resin.
- the embossing temperature of the first transparent resin substrate sheet 11 is generally set to the second transparent resin. The temperature becomes higher than the melting temperature of the base sheet 12.
- both transparent resin base sheets are in a flowing state.
- the following processing methods (A) and (B) are possible.
- the processing method (C) is possible. It is.
- the embossing method 'machine itself is known.
- Both transparent resin base sheets 11 and 12 are made into a single-sheet sheet, which is embossed by a single-sheet hot press machine.
- Both transparent resin base sheets 11 and 12 are formed into continuous belt-shaped sheets, which are sandwiched and pressurized between an endless belt-shaped embossing plate and an endless belt-shaped impression cylinder. By driving the note in synchronization with the sheet traveling speed, embossing is performed without substantially applying tension to both transparent resin base sheets in a flowing state.
- the transparent resin base sheets 11 and 12 are formed into continuous strip-shaped sheets, and the laminated sheets are embossed using a rotary embossing machine in a laminated state.
- the second transparent resin substrate sheet 12 side is heated to a temperature lower than the melting temperature of the second transparent resin substrate sheet 12 by heat conduction from the heating drum, while the first transparent resin substrate sheet 11 side is irradiated with infrared rays. Only the first transparent resin substrate sheet 11 near the surface is locally heated by a radiant heater so as to have a melting point of the first transparent resin substrate sheet 11 or higher, and embossing is performed.
- a first transparent resin base sheet 11, a second transparent resin base sheet 12, and a glittering layer 2 each having a flat and uniform film thickness are prepared.
- the first transparent resin base material sheet 11 on the front side and the second transparent resin base material sheet 12 on the back side are laminated in advance
- the glittering layer 2 is laminated on the substrate by a printing method or the like. Note that all three layers may be prepared as separate layers and laminated at the same time as embossing.
- the first resin base sheet 11 is made of a crystalline resin
- the second transparent resin base sheet 12 is made of an amorphous resin
- the melting point of the first transparent resin base sheet 11 is the second transparent resin base sheet. It is higher than the softening temperature of 12.
- the surface of the rubber impression cylinder C has a rough surface Fr corresponding to the rough surface to be formed on the surface of the first transparent resin base material sheet 11.
- At least the surface of the rubber impression cylinder C is made of rubber such as silicone rubber.
- the center part may be made of a rigid core material such as iron.
- the metal embossing plate E is made of a metal such as iron or copper, and has an uneven surface corresponding to the unevenness to be formed on the rear surface of the second transparent resin base material sheet 12.
- the rubber impression cylinder C and the metal embossing plate E may be either flat or cylindrical.
- the first transparent resin substrate sheet 11, the second transparent resin substrate sheet 12, and the glittering layer 2 are heated and softened, and as shown in FIG. 5B, the first transparent resin substrate sheet 11 Rubber on the front side
- the first and second transparent resin base material sheets 11 and 12 and the glitter layer 2 are pressed with rubber so as to contact the impression cylinder C side and the back side of the glitter layer 2 against the metal embossing plate E side. Press with the body C and the metal embossing plate E (so-called embossing).
- the surface side of the first transparent resin substrate sheet 11 is heated by an infrared radiation heater (not shown) to heat the vicinity of the surface of the first transparent resin substrate sheet 11 to a melting point or higher.
- the second transparent resin substrate sheet 12 is heated by heat conduction from a heating drum (not shown) so that the second transparent resin substrate sheet 12 reaches the softening temperature or higher but does not reach the melting temperature. Heat.
- each layer is strongly pressed, and both transparent resin base sheets 11 , 12 are relatively thin.
- the rough surface Fr of the surface of the rubber impression cylinder C is completely formed, and the surface of the first transparent resin base material sheet 11 becomes a low gloss region L.
- the pressing force is weak in each layer, and the thickness of the transparent resin base sheets 11 and 12 is relatively large.
- the shape of the rough surface Fr on the surface of the rubber impression cylinder C becomes incomplete, and the surface of the first transparent resin base material sheet 11 becomes a high gloss area H.
- the rubber impression cylinder C and the metal embossing plate E are released from the pressing, whereby the layers are laminated and shaped, and the decorative sheet of the present invention shown in FIG. G S5 is obtained.
- the glittering layer 2 is provided (laminated) on the back surface of the transparent resin substrate sheet 1.
- the glitter layer comprises a glitter ink layer in which a glitter pigment is dispersed in a transparent binder, a metal thin film layer, or the like.
- a resin of the binder of the glitter ink layer an acrylic resin, a vinyl chloride-butyl acetate copolymer, a chlorinated polypropylene, a polyester resin, a polyurethane resin, or the like is used.
- the brilliant pigment metal pigments such as metal powders or scales such as aluminum and brass, and pearlescent pigments such as powders or scales of titanium dioxide-coated mica are used.
- the glittering ink layer may be formed by a coating method such as roll coating, comma coating, slit reverse coating, curtain flow coating, or the like, and gravure printing, silk-screen printing, or other solid printing.
- a coloring agent may be added to give a colored metallic luster (color metallic).
- the thickness of the glitter ink layer is usually about 110 / im.
- the metal thin film layer is formed by, for example, vapor deposition, sputtering, or electroless plating of a metal such as aluminum, chromium, tin, or indium.
- a coloring agent is added to the transparent resin base material sheet 1, or a colored transparent ink layer is provided between the transparent resin base material sheet 1 and the metal thin film layer, so that the brilliancy by the brilliant layer is also provided.
- the thickness of the metal thin film layer is usually about 0.1-1 ⁇ m.
- the decorative layer 3 is a layer provided as necessary to make the decorative sheet have a higher design.
- the decorative layer is formed of partially provided transparent material such as transparent coloring ink or the like so as not to impair the brilliancy of the brilliant layer 2 and the sense of visual unevenness based thereon.
- the ink used to form the decorative layer 3 may be appropriately selected from known ones. For example, acrylic resin, vinyl chloride-biel acetate copolymer, chlorinated polypropylene, polyester resin, polyurethane resin, etc. are used as the resin for the binder of the ink.
- Examples of the coloring agent to be contained in the ink include inorganic pigments such as titanium white, zinc white, carbon black, iron black, red iron oxide, cadmium red, ultramarine, cobalt blue, graphite, titanium yellow, phthalocyanine blue, and indus.
- Organic pigments such as Lenblue, isoindolinone yellow, quinacridone red, and perylene red, or dyes are used.
- the pattern of the decorative layer 3 may be, for example, a wood pattern, a stone pattern, a grain pattern, a grain pattern, a leather pattern, a tiled pattern, a brickwork pattern, a geometric pattern, a character, a symbol, or a solid surface. is there.
- the decorative layer may be a functional layer such as a magnetic layer or a conductive layer in addition to the expression of the pattern design such as wood grain. That is, the decoration or the decoration includes such a functional addition.
- the backing sheet 4 is provided as appropriate mainly for adjusting (securing) the total thickness of the decorative sheet. Further, the backing sheet 4 can be provided to improve the adhesion to the adherend. Such a backing sheet 4 can be formed by laminating a thermoplastic resin sheet on the back side of the glittering layer.
- Various thermoplastic resins such as polypropylene, chlorinated A polyolefin-based resin, an ABS resin, or a mixed resin of a polyolefin-based resin and an ABS resin, for example, and a mixed resin of different kinds of resins may be appropriately used depending on the material of the adherend.
- a transparent resin base sheet or, if it is a two-layer laminate, a second resin base sheet similar to the transparent resin base sheet so as not to impair the formability is preferred to be composed of
- a resin sheet prepared in advance as a thermoplastic resin sheet is formed on the glittering layer 2 by a known laminating method such as a dry lamination method using a known adhesive such as a urethane resin. If you stick them together, Specifically, for example, a thermoplastic resin sheet is bonded to the surface of the glittering layer 2 of the laminate of the transparent resin base material sheet 1 and the glittering layer 2 with an adhesive. Note that the thermoplastic resin sheet of the backing sheet 4 may be laminated at the same time as film formation by melt extrusion coating of the thermoplastic resin.
- the thickness of the backing sheet 4 is usually about 20 to 500 ⁇ m in terms of securing the total thickness and improving the adhesiveness to an adherend, etc. in order to secure the total thickness of the force depending on the purpose.
- the backing sheet 4 can also have a concealing reinforcing function of concealing the adherend.
- the glittering layer 2 is a thin film and the above-mentioned concealing property is insufficient, or when the decorative sheet is formed, the glittering layer 2 is partially stretched to form a thin film or cracks. Concealment may decrease.
- backing sheet 4 In order to make the backing sheet 4 opaque, a pigment having high concealment may be added to the thermoplastic resin in order to impart concealment. Examples of highly opaque pigments include titanium white and carbon black (black ink). In this case, if necessary, another coloring agent may be appropriately added.
- a known adhesive layer can be appropriately provided on the rearmost surface of the decorative sheet as needed.
- the adhesive layer for example, an acrylic resin, a chloride-butyl acetate copolymer, a chlorinated polyolefin resin, a urethane resin, a rubber resin, or the like is used.
- the decorative sheet of the present invention can be used for the purpose of stacking and decorating various adherends 5, but the adherend is not particularly limited.
- the material and shape of the adherend are arbitrary.
- the material resin, woody material, metal, non-metallic inorganic material, There are paper, cloth and the like.
- the shape can be arbitrarily determined as a sheet (or film), a plate, a three-dimensional object, or the like.
- the decorative molded article of the present invention is provided with a resin molded article 5 as an adherend, and a laminate formed so that the transparent resin base material sheet 1 side is positioned on the surface side of the resin molded article 5.
- Decorative sheet S In the high gloss region, the decorative sheet S has, for example, a rear surface side of the transparent resin base material sheet 1 that is convex toward the rear surface direction, and the front surface side of that portion faces a flat surface or a surface direction. Is concave.
- the adherend is a resin molded product.
- the decorative sheet is laminated and integrated on the surface of the resin molded product in an injection mold. It is a molding simultaneous decoration method.
- the decorative sheet of the present invention exhibits a three-dimensional design feeling of concave and convex by a visual effect even when the sheet surface is flat or substantially flat, the decorative sheet is formed by embossing at the time of vacuum forming or injection molding. A good concavo-convex pattern can be visually provided without fear of disappearance of the actual concavo-convex shape.
- the transparent resin base sheet 1 has a two-layer structure of a first transparent resin base sheet 11 located on the front side and a second transparent resin base sheet 12 located on the back side.
- the transparent resin base sheet 11 is made of a crystalline resin
- the second transparent resin base sheet 12 is made of an amorphous resin.
- FIG. 4B shows a cross-sectional view and a partially enlarged view thereof.
- One of the typical production methods for such decorative molded articles is the simultaneous injection molding and decorative method.
- the transparent resin base sheet 1 has a two-layer structure of a first transparent resin base sheet 11 and a second transparent resin base sheet 12.
- the shape of the decorative molded product Pd is a three-dimensional object having a non-planar surface such as an uneven surface or a planar surface.
- the shape of the decorative molded product is a plate (A flat plate, a curved plate, etc.), a columnar shape, a three-dimensional solid object, and the like.
- the injection resin to be the resin molded product 5 is basically not particularly limited, and may be a known resin. What is necessary is just to select according to the required physical properties of a product, cost, etc.
- the thermoplastic resin an ABS (acrylonitrile-butadiene-styrene copolymer) resin, a styrene resin, an acrylic resin, a vinyl chloride resin, a polycarbonate resin, a polyolefin resin, or the like is used.
- a curable resin a two-component curable resin, for example, an uncured resin liquid such as a urethane resin, an unsaturated polyester resin, or an epoxy resin is used.
- thermoplastic resin is heated and melted and injected in a fluid state, and the curable resin (the uncured product) is injected in a fluid state at room temperature or appropriately heated.
- the injection resin contains various known additives such as a coloring agent, a filler, a stabilizer, and a lubricant as appropriate according to the application.
- the injection molding simultaneous decorating method according to the present invention includes a sheet forming step of a decorative sheet, and more preferably, a vacuum forming step as preliminary forming of the sheet.
- a sheet forming step of a decorative sheet and more preferably, a vacuum forming step as preliminary forming of the sheet.
- the injection molding simultaneous decorating method will be described in the order of sheet forming step, vacuum forming step, and injection molding step.
- the sheet preparation step is a step of preparing and preparing a decorative sheet as described above.
- the sheet preparation step according to the present invention is a sheet preparation step in which the layer of the decorative sheet and its resin composition, the melting point and the softening temperature, the embossing temperature of the concavo-convex shaping, and the like are specified. That is, in the sheet forming step, as a decorative sheet, a laminate including at least the transparent resin base sheet 1 and the glittering layer 2 that are positioned outside in the state of the decorative molded article is heated. Next, the thickness of the transparent resin substrate sheet 1 is changed by embossing so as to correspond to the high gloss region and the low gloss region on the surface of the transparent resin substrate sheet 1 and the high gloss region and the low gloss region. Prepare decoration sheet S.
- the transparent resin base material sheet 1 includes a first transparent resin base material sheet 11 located on the front side and a second transparent resin base sheet located on the back side.
- the resin base sheet 12 has a two-layer structure.
- the first transparent resin substrate sheet 11 is made of a crystalline resin
- the second transparent resin substrate sheet 12 is made of an amorphous resin
- the melting point of the first transparent resin substrate sheet 11 is a second transparent resin. It is higher than the softening temperature of the fat base sheet 12.
- the first transparent resin base sheet 11 includes a vinylidene fluoride resin
- the second transparent resin base sheet 12 includes an acrylic resin. Including.
- the decorative sheet S as described above is simultaneously decorated by injection molding in a form with sheet preforming.
- the sheet heating temperature is preferably set to the second temperature.
- the temperature is equal to or higher than the softening temperature of the transparent resin base material sheet 12 and lower than the melting point of the first transparent resin base material sheet 11.
- the vacuum forming step (including vacuum pressure forming) for preforming the decorative sheet is roughly divided into a vacuum forming die and an injection molding die, and vacuum forming is performed on the injection molding die.
- vacuum forming is performed on the injection molding die.
- inline preforming that is performed
- vacuum preforming that is different from the injection molding die
- offline preforming that performs vacuum forming outside the injection molding machine.
- off-line preforming is more suitable than in-line preforming when the size of the decorative molded product is large or when the sheet thickness is large.
- the sheet heating temperature during vacuum forming is usually about 100 to 120 ° C for in-line preforming and about 140 to 170 ° C for off-line preforming. Therefore, for example, when the transparent resin base sheet 1 uses a decorative sheet having a specific two-layer structure, a vinylidene fluoride resin is used for the first transparent resin base sheet 11 and a second transparent resin base is used. In the case of a decorative sheet having a configuration in which an acrylic resin is used for the material sheet 12, the present invention can be applied to both ordinary in-line preforming and off-line preforming.
- the preforming temperature indicates a general temperature, and may be set at a temperature outside the above range according to the resin used for the decorative sheet.
- a pair of male and female injection molding dies is clamped in a state where the decorative sheet preformed by the vacuum molding step as described above is loaded in the injection molding die. That Thereafter, the resin in the fluid state is injected into the cavity of the injection mold, filled and solidified, and the decorative sheet is integrated with the surface of the resin molded product. Then, after the resin is solidified, the mold is opened and the decorative molded product to be taken out is taken out.
- the decorative molded product is given a three-dimensional design feeling by which the uneven pattern is visually felt by the decorative sheet as described above.
- the injection resin to be injected into the injection mold is usually heated and melted to be in a fluid state, and its temperature can reach 200 ° C or more. Even so, the uneven shape of the decorative sheet is maintained. In other words, the heat of the injection resin at the time of injection molding does not influence as at the time of vacuum molding.
- the injection resin is ABS resin
- the decorative sheet is exposed to a temperature of about 200 240 ° C for the injection resin and about 60 ° C for the injection mold. This is because the sheet is instantaneously added to the decorative sheet, and if the concave-convex shape can withstand the vacuum forming process, the concave-convex shape can basically be left on the decorative molded product.
- FIGS. 6A to 6C a so-called simultaneous injection molding decoration method will be outlined with reference to the conceptual diagrams of FIGS. 6A to 6C.
- the embodiment described here is an inline preforming mode in which a vacuum forming process is performed on an injection mold.
- a mold Ma having a runner (runner) and a gate (gate) communicating with the injection nozzle, and a suction hole 41 on the cavity surface are provided.
- a pair of molds, Mb which also serve as a preforming mold for the vacuum forming process of the decorative sheet, is used. These molds are made of metal such as iron or ceramics.
- the decorative sheet S is supplied between the two molds Ma and Mb, and the decorative sheet S is fixed to the mold Mb by pressing with a sheet clamp 42 having a frame shape in plan view.
- the back side of the decorative layer on the side of the glittering layer is the injection resin side on the right side of the drawing.
- the heater 43 retracted at the retracted position outside the mold (in the drawing, above the mold) is appropriately moved and inserted between both molds. Is heated and softened.
- the heating step in this case includes, for example, non-contact radiant heating, but may be conduction heating by contact.
- the decorative sheet S is sucked from the suction hole 41 and vacuum formed, and the decorative sheet is preformed along the cavity surface of the mold Mb.
- the heater 43 is retracted from between the two dies, the two dies are clamped as shown in FIG. 6C, and the cavity formed by both dies is filled with the resin Pm in a fluidized state such as a heated and molten state.
- the mold is opened and the molded product is taken out. Then, by trimming the unnecessary portion of the decorative sheet as appropriate, as shown in FIGS. 4A to 4B, a decorative molded product Pd in which the decorative sheet S is laminated and decorated on the resin molded product 5 is obtained. Further, in the present invention, the decorative sheet allows the expression of a three-dimensional design to visually perceive the concavo-convex pattern even with the decorative molded product.
- the decorative sheet S5 shown in FIG. 3 was produced as follows. First, two layers of co-extruded a vinylidene fluoride resin (melting point Tml60 ° C), which is a fluorine resin of a crystalline resin, and an atarinole resin (VICAT, temperature Tsl18 ° C), which is a non-crystalline resin. Then, a transparent resin base sheet 1 in which the first transparent resin base sheet 11 having a thickness and the second transparent resin base sheet 12 having a thickness were laminated was produced.
- a vinylidene fluoride resin melting point Tml60 ° C
- VICAT temperature Tsl18 ° C
- an acrylic resin is used as a binder resin, and a flaky aluminum foil piece (average particle size of 14
- the brilliant layer 2 having a thickness (when dried) of 2 ⁇ m was formed by gravure printing using silver ink to which ⁇ m) was added.
- an ink composed of a mixed resin of an acrylic resin and a vinyl chloride-butyl acetate copolymer in a mass ratio of 1: 1 is printed twice by gravure printing twice, and an adhesive layer having a thickness of 4 ⁇ m (when dry) is formed. (Not shown) to obtain a decorative sheet.
- the surface of the first transparent resin base material sheet 11 of vinylidene fluoride resin has fine irregularities having a center line average roughness Ra5 im.
- a low-gloss area L that was rough and flat when viewed from the surface, and a high-gloss area Hr that was concave when viewed from the surface and had a smooth center line average roughness RaO.lzm were formed.
- the height difference between the concave portion and the convex portion was ⁇ .
- the low-gloss area L and the high-gloss area H are elongated striped areas each having a width of 100 to 200 ⁇ m.
- a hairline pattern is formed as a whole.
- the second transparent resin base material sheet 12 of the acrylic resin and the glittering layer 2 With respect to the second transparent resin base material sheet 12 of the acrylic resin and the glittering layer 2, a concave region is formed in a portion facing the low gloss region L, and a convex region is formed in the portion facing the high gloss region H. A partial region P was formed. The height difference between both regions was 80 ⁇ m.
- the surface temperature of the first transparent resin substrate sheet 11 at the time of embossing was set to 180 ° C. by heating an infrared radiation heater.
- the second transparent resin substrate sheet 12 was heated by conduction heat from a heated metal drum having a surface temperature of 150 ° C.
- the decorative sheet S obtained above was attached to the simultaneous injection-molding and decorating apparatus such that the glittering layer 2 side faced the male mold gate side of the injection mold.
- the decorative sheet is heated and softened by non-contact heating using a heater under the condition of a sheet heating temperature of 120 ° C on the female mold of the injection molding die to be used as a vacuum molding die, and then vacuum suction is performed from the injection molding die side.
- the decorative sheet was vacuum formed into the shape of the injection molding die.
- the injection mold was closed, and the ABS resin was injection molded.
- the temperature of the injection mold was 60 ° C and the temperature of the injection resin was 240 ° C.
- the decorative molded product Pd was taken out, and the residual state of the uneven pattern in the molded product was confirmed.As a result, the decorative molded product Pd had irregularities including fine irregularities on its surface, The three-dimensional design feeling that visually perceives the uneven pattern was expressed, and it was a molded product of high design.
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US10/573,409 US7776423B2 (en) | 2003-09-29 | 2004-07-02 | Decorating sheet, decorated molded product, and in-injection-mold decorating method |
EP04746895.4A EP1669191B1 (en) | 2003-09-29 | 2004-07-02 | Decorating sheet, decorated molded article and in-mold decorating injection molding |
KR1020067005665A KR101161032B1 (ko) | 2003-09-29 | 2004-07-02 | 가식 시트와 가식 성형품 및 사출성형 동시 가식 방법 |
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JP2003-337086 | 2003-09-29 | ||
JP2003337086A JP4319882B2 (ja) | 2003-09-29 | 2003-09-29 | 加飾シート、加飾成形品、及び射出成形同時加飾方法 |
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WO2005030481A1 true WO2005030481A1 (ja) | 2005-04-07 |
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PCT/JP2004/009426 WO2005030481A1 (ja) | 2003-09-29 | 2004-07-02 | 加飾シート、加飾成形品、及び射出成形同時加飾方法 |
Country Status (5)
Country | Link |
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US (1) | US7776423B2 (ja) |
EP (1) | EP1669191B1 (ja) |
JP (1) | JP4319882B2 (ja) |
KR (1) | KR101161032B1 (ja) |
WO (1) | WO2005030481A1 (ja) |
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JP4357804B2 (ja) * | 2002-07-10 | 2009-11-04 | 大日本印刷株式会社 | 成形加飾用シート及び射出成形同時加飾方法 |
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- 2004-07-02 WO PCT/JP2004/009426 patent/WO2005030481A1/ja active Application Filing
- 2004-07-02 US US10/573,409 patent/US7776423B2/en active Active
- 2004-07-02 KR KR1020067005665A patent/KR101161032B1/ko active IP Right Grant
- 2004-07-02 EP EP04746895.4A patent/EP1669191B1/en active Active
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Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US8652385B2 (en) * | 2006-09-07 | 2014-02-18 | Okia Optical Company Ltd. | Method of manufacturing a decorative article with sealed decorative laminated sheet |
JP2008088682A (ja) * | 2006-09-29 | 2008-04-17 | Dainippon Printing Co Ltd | 床材用化粧シート |
JP2015024521A (ja) * | 2013-07-25 | 2015-02-05 | リケンテクノス株式会社 | 高光沢加飾シートの製造方法 |
CN111186152A (zh) * | 2020-03-17 | 2020-05-22 | 晋江市诺特新材料科技有限公司 | 一种在印刷后裸眼可见不同变换效果的塑料薄膜及其制备方法 |
CN111186152B (zh) * | 2020-03-17 | 2022-05-06 | 晋江市诺特新材料科技有限公司 | 一种在印刷后裸眼可见不同变换效果的塑料薄膜及其制备方法 |
Also Published As
Publication number | Publication date |
---|---|
KR20060101459A (ko) | 2006-09-25 |
US20070026197A1 (en) | 2007-02-01 |
JP2005103794A (ja) | 2005-04-21 |
KR101161032B1 (ko) | 2012-06-28 |
EP1669191A1 (en) | 2006-06-14 |
EP1669191A4 (en) | 2010-01-06 |
EP1669191B1 (en) | 2013-05-22 |
US7776423B2 (en) | 2010-08-17 |
JP4319882B2 (ja) | 2009-08-26 |
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