JP2015196353A - Decorative sheet, decorative article and method of producing decorative article - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a technique which improves the appearance quality of end surfaces when a decorative sheet provided with a leather-like sheet, e.g. artificial leather or synthetic leather to be stuck to the surface of an article, as a decorative sheet is stuck to an article.SOLUTION: A decorative sheet for decoration of an article includes a fiber substrate, a surface resin layer and a hot melt adhesive layer intervening between the fiber substrate and the surface resin layer and has a cut surface which is cut in such a way that an inclination of 30 degree or greater to the vertical surface relative to the upper surface, with the surface resin layer as the upper surface, is retained.

Description

  The present invention relates to a decorative article having a leather-like appearance.

  When the leather is cut, a cut surface of the fiber containing collagen fibers appears. Such a cut surface of leather is inferior in aesthetics and durability as it is. Conventionally, cut surfaces of leather products have been subjected to a cross-sectional finish in order to improve aesthetics and durability.

  As a technique for finishing a cross-section, for example, helicopter turning, nail drawing, edge polishing, and the like are known.

  The helicopter is a process of finishing the cross-section by thinning the end of the leather thinly and folding the shaved part inward. FIG. 8 shows a schematic diagram of the leather product that has been helicoptered. FIG. 8A is a schematic perspective view of a helicopter portion when the leather 70 is bonded to the core 71 and the end portion 70E of the leather 70 is helicopter-treated, and FIG. 8B is a perspective view of FIG. It is a cross-sectional schematic diagram of BB 'cross section. As shown in FIG. 8B, the helicopter is bonded to the core material 71 so that the cut surface 70E obtained by thinly scooping the leather 70 protrudes, and the end portion 70E is folded and glued with glue 72 or sewn. It is a technique that hides the cut surface of the leather by fixing it.

  In addition, the idea of drawing is to provide design properties and improve the adhesive strength by gluing by pressing the wire while melting it using a heated linear iron near the cut surface of the leather. It is a process to make. FIG. 9 shows a schematic diagram of the leather product that was conceived. FIG. 9A is a schematic perspective view of a leather product in which leather 70 is bonded to a core 71 with glue 72, and a wire 71L is formed using a heated iron near the cut surface of the leather 70. FIG. 9B is a schematic cross-sectional view taken along the line CC ′ of FIG. 9A.

  Also, edge polishing makes the cross section of the leather (edge) polished to homogenize the cross-section roughness, and by repeating the process of applying paint, the end face has a uniform, hardened aesthetic appearance. It is a technique to form.

  As for the cross-section finishing of the leather as described above, any method is finished one by one by a leather craftsman having skilled skills. For example, in the case of helicopter turning, the end of the leather is accurately rolled, folded and glued together. Such skilled skills cannot be acquired in a short period of time. In addition, it is difficult to apply the method to mass-produced products because it is necessary to carefully finish each one through steps such as curling, folding, gluing, and drying the glue one by one.

  By the way, in recent years, decorative articles decorated in leather-like appearance are known as exterior parts of cameras, mobile devices, mobile phones, home appliances, interior parts such as vehicles and aircraft, building materials and furniture. ing. For example, Patent Document 1 below discloses a camera holder in which natural or artificial leather or a film is attached to at least a part of the outer surface.

Registered Utility Model No. 3185757

  FIG. 10 shows a schematic cross-sectional view of an article to which a sheet having a leather-like surface is bonded. FIG. 10 is a partial cross-sectional schematic view showing a state when a decorative sheet 90 having a leather-like appearance is bonded to the member 8. As shown in FIG. 10, the decorative sheet 90 includes, for example, a fiber base material 1, a surface resin layer 2 that is laminated on the fiber base material 1 to form a decorative surface, and an adhesive layer 5. .

  As shown in FIG. 10, the cut surface 90 </ b> E is exposed as it is on the end surface of the decorative sheet 90 bonded to the surface of the member 8. The exposed cut surface 90E is formed from the end surface of the fiber substrate 1, the end surface of the surface resin layer 2, and the end surface of the adhesive layer 5, and the color tone and texture of each layer are different from each other. Therefore, there is a problem that the appearance of the end face that is made of a laminated structure of the fiber base material, the resin layer, and the adhesive layer is low in quality. In addition, when the decorative sheet is cut and shaped by laser cutting from the original fabric, a portion that is burnt or melted and deformed by laser cutting is formed on the end surface, and the state of such end surface There is a problem that the quality of the appearance is deteriorated even if it is visually recognized.

  The cut surface of the leather can be concealed by applying a helicopter similar to the leather to the decorative sheet. However, pasting a decorative sheet to the camera, mobile information terminal device, mobile phone, home appliance housing, etc. as described above, and applying a helicopter treatment to the end face of the process, cost, and skill It is difficult because it is difficult to secure engineers.

  The present invention is a decorative sheet comprising a leather-like sheet such as artificial leather or synthetic leather that is bonded to the surface of an article as a decorative layer. The purpose is to provide technology.

  One aspect of the present invention is a decorative sheet for decorating an article, comprising a fiber base material, a surface resin layer, and a hot melt adhesive layer interposed between the fiber base material and the surface resin layer. The decorative sheet has a cut surface that has a surface resin layer as an upper surface and maintains an inclination of 30 degrees or more with respect to a surface perpendicular to the upper surface. In such a decorative sheet, the cut surface is cut with an inclination, and the hot melt adhesive layer is exposed in the cross section, so that the cut surface is hidden by thermocompression treatment. Can do. The cut surface is preferably formed by, for example, laser cutting.

  Another aspect of the present invention is a decorative article in which the above-described decorative sheet is bonded to the surface of the article, and the decorative sheet is an article or decorative sheet with its cut surface folded back. Is a decorative article bonded with a hot melt adhesive layer. In such a decorative article, since the cut surface is folded and bonded with the adhesive derived from the hot melt adhesive layer, the cut surface is hidden.

  Another aspect of the present invention is a decorative article in which the above-described decorative sheet is bonded to the surface of the article, and the cut surface of the decorative sheet is the hot melt adhesive layer on the surface of the article. It is a decorative article bonded with In such a decorative article as well, the cut surface is hidden because the cut surface is adhered to the surface of the article with an adhesive derived from the hot melt adhesive layer.

  Another aspect of the present invention is a process in which the decorative sheet is bonded to each of the first and second surfaces of an article having a first surface and a second surface facing each other. The decorative article is a decorative article in which cut surfaces of the decorative sheet respectively disposed on the first surface and the second surface are bonded to each other with a hot melt adhesive layer. In such a decorative article, the cut surfaces are concealed without being folded back by thermocompression bonding of the cut surfaces of the decorative sheets disposed on both sides of the article to bond the cut surfaces together.

  Another aspect of the present invention is a method for producing any one of the above decorative articles.

  According to the present invention, in a decorative article obtained by laminating a decorative sheet having a leather-like appearance on the surface of the article, the appearance quality of the end face of the decorative sheet can be improved by a simple process. .

FIG. 1 is a partial cross-sectional schematic diagram of a decorative sheet according to an embodiment. FIG. 2 shows a partial schematic cross-sectional view for explaining a method of bonding a decorative sheet to a member. FIG. 3 shows a partial schematic cross-sectional view for explaining a method of adhering to a member without folding the cut surface of the decorative sheet, which is an embodiment. FIG. 4 is an embodiment for explaining a method of adhering a decorative sheet to both surfaces of an article, and bonding the cut surfaces of the arranged decorative sheet by melting a hot-melt adhesive layer. The partial schematic sectional drawing of is shown. FIG. 5: shows the partial schematic cross section for demonstrating the method which forms an embossed handle in the sheet | seat for decoration which is embodiment. FIG. 6 shows an explanatory view for explaining a method for producing a decorative sheet. FIG. 7 is a schematic diagram illustrating an example of the use of the decorative sheet. FIG. 8 shows a schematic diagram of a leather product that has been helicoptered. FIG. 9 shows a schematic diagram of a conceived leather product. FIG. 10 is a partial schematic cross-sectional view of a conventional decorative sheet.

  Embodiments of a method for manufacturing a decorative sheet, a decorative article, and a decorative article according to the present invention will be described.

  FIG. 1 is a schematic partial sectional view of a decorative sheet 10 according to an embodiment. The decorative sheet 10 is a decorative sheet for decorating the surface of an article, and includes a fiber substrate 1, a surface resin layer 2 that becomes a decorative surface, a fiber substrate 1, and a surface resin layer 2. And a hot melt adhesive layer 3 interposed therebetween, and has a cut surface 10E so as to maintain an inclination of an angle α of 30 degrees or more with respect to the vertical plane Ax with reference to the surface of the surface resin layer 2. The fiber substrate 1 and the surface resin layer 2 are bonded via a hot melt adhesive layer 3 to form a leather-like sheet 4. And the adhesive layer 5 formed from the adhesive or the adhesive is formed on the surface to be bonded to the article of the fiber substrate 1. As shown in FIG. 1, the decorative sheet 10 has a cut surface 10 </ b> E that is cut with the surface of the surface resin layer 2 as the upper surface and an angle α of 30 degrees or more with respect to the vertical surface Ax with respect to the upper surface. . By thus cutting the cut surface 10E in an oblique direction, the hot melt adhesive layer 3 is exposed on the cut surface 10E.

  FIG. 2 is a partial schematic cross-sectional view for explaining a process of bonding the decorative sheet 10 to the member 8 that is an article.

  As shown in FIG. 2A, the decorative sheet 10 is bonded to a predetermined bonding surface of the member 8. The bonding is performed such that the cut surface 10E protrudes from the end of the member 8, as shown in FIG. And as shown in FIG.2 (c), the cut surface 10E which protruded from the edge part of the member 8 is turned inside.

  In FIG. 2 (d), 6 is a hot press mold comprising an upper mold 6a and a lower mold 6b. By placing the constituent body of the decorative sheet 10 and the member 8 with the cut surface 10E turned back in FIG. 2 (c) in the lower mold 6b, and clamping the upper mold 6a and the lower mold 6b. Heat press for a predetermined time. The hot press mold is heated to such a temperature that the hot melt adhesive layer 3 is melted.

  Then, after the hot pressing, the hot press mold 6 is opened and cooled to obtain a decorative article 20 as shown in FIG. In the decorative article 20, the cut surface 10 </ b> E of the decorative sheet 10 is folded back, and an end surface 10 a is formed that is bonded while being folded back by the hot melt adhesive layer 3 by hot pressing. By forming such an end surface 10a, the decorative article 20 in which the cut surface 10E of the decorative sheet 10 is hidden is obtained.

  3 is a part for explaining a method of adhering the decorative sheet 10 to the member 8 as an article and bonding the cut surface 10E to the member 8 without folding back, as an embodiment different from the embodiment of FIG. It is a schematic cross section.

  As shown in FIG. 3A, the decorative sheet 10 is bonded to a predetermined bonding surface of the member 8. The bonding is performed so that the cut surface 10E does not protrude from the end of the member 8, as shown in FIG.

  In FIG. 3B, 16 is a heated hot press jig, and 9 is a table. As shown in FIG. 3 (b), a hot press jig 16 heated to a temperature at which the hot melt adhesive layer 3 is melted is pressed against the cut surface 10 </ b> E of the decorative sheet 10. The hot melt adhesive layer 3 is melted by pressing the hot press jig 16.

  Then, the hot press jig 16 is pressed to melt the hot melt adhesive layer 3 and the cut surface 10E is bonded to the member 8, and then the hot press jig 16 is released and cooled, so that FIG. ) Is formed. By forming such an end surface 10b, the decorative article 30 in which the cut surface 10E of the decorative sheet 10 is hidden is obtained.

  Further, FIG. 4 shows an embodiment different from the embodiment shown in FIGS. 2 and 3, in which decorative sheets 10 are bonded to both surfaces of the article 8, and the decorative sheets 10 arranged on the respective surfaces. It is a partial schematic cross section for demonstrating the method to fuse | melt the hot-melt-adhesive agent layer 3, and cut | disconnect the cut surfaces 10E.

  As shown to Fig.4 (a), the sheet | seat 10 for decorating is bonded to each predetermined bonding surface of the both surfaces of the member 8, respectively. The bonding is performed such that each cut surface 10E protrudes from the end of the member 8, as shown in FIG.

  In FIG. 4C, the upper welding jig 26a and the lower welding jig 26b are a set of jigs for the thermal welding apparatus. In FIG. 4C, the two cut surfaces 10E of the member 8 and the two decorative sheets 10 bonded to both surfaces thereof are sandwiched between the upper welding jig 26a and the lower welding jig 26b. By fastening, the welding process is performed for a predetermined time. The upper welding jig 26a and the lower welding jig 26b are heated to a temperature at which the hot melt adhesive layer 3 is melted.

  Then, after the welding process, the upper welding jig 26a and the lower welding jig 26b are separated and cooled, whereby a decorative article 40 as shown in FIG. 4D is obtained. In the decorative article 40, the end portions of the two decorative sheets 10 are bonded by the hot-melt adhesive layer 3 by a welding process to form an end surface 10c as shown in FIG. By forming such an end surface 10c, the decorative article 40 in which the cut surface 10E of the decorative sheet 10 is hidden is obtained.

  FIG. 5 shows a modification of the embodiment shown in FIG. 2 by sticking the decorative sheet 10 to the member 8 which is an article, and embossing while cutting back the cut surface 10E of the decorative sheet 10. It is a fragmentary schematic cross section for demonstrating the method of embossing shapes, such as a mind-drawing line.

  In FIG. 5A, reference numeral 36 denotes a hot press die comprising an upper die 36a and a lower die 36b. The upper mold 36 a is formed with a protrusion 36 c for embossing a predetermined portion of the decorative sheet 10.

  As shown in FIG. 5 (a), the structure of the decorative sheet 10 with the cut surface 10E folded back and the member 8 is placed in the lower mold 36b, and the upper mold 36a and the lower mold 36b are molded. It is heat-pressed for a predetermined time by tightening. The hot press mold is heated to such a temperature that the hot melt adhesive layer 3 is melted.

  Then, after the hot pressing, the decorative article 50 as shown in FIG. 5B is obtained by opening and cooling the hot pressing die 36. In the decorative article 50, the cut surface 10E of the decorative sheet 10 is folded and bonded while being folded back by the hot melt adhesive layer 3 by hot pressing. At the same time, by pressing the protrusions 36c against the surface of the decorative sheet 10 to melt the hot melt adhesive layer 3, the stamping part 10d as shown in FIG. It is formed. By forming the embossed portion 10 d, the embossed portion is strongly bonded to the member 8 with an adhesive derived from the hot melt adhesive layer 3.

  Next, an example of the manufacturing method of the decorating sheet of this embodiment will be described with reference to FIG. In FIG. 6, reference numeral 100 denotes a laser cutting device. The laser cutting device 100 includes a laser oscillation unit 101 that emits a laser such as a YAG laser or a fiber laser, and a focusing lens that focuses the emitted laser, and the focused laser 103 is xy along a predetermined cutting path. And a laser head 102 that irradiates while moving on a plane. Reference numeral 105 denotes a table, on which an original sheet 110 for decorating is placed. The original sheet 110 of the decorative sheet is a leather-like sheet 4 comprising a fiber base material 1, a surface resin layer 2, and a hot melt adhesive layer 3 that bonds the fiber base material 1 and the surface resin layer 2. And an adhesive layer 5 laminated on the other surface of the fiber substrate 1.

  As shown in FIG. 6, in the manufacture of the decorative sheet, the leather-like sheet 4 is formed on the surface of the table 105 in order to shape the original sheet 110 of the decorative sheet into the shape of the decorative sheet. The original fabric 110 is arranged so that the surface resin layer 2 faces. Further, the laser head 102 has an inclination so that the laser 103 is irradiated while maintaining a predetermined angle α with respect to the vertical plane Ax with respect to the surface of the table 105 from the side of the adhesive layer 5. Is positioned. At this time, the side of the adhesive layer 5 faces the laser head 102.

  Then, the laser cutting device 100 irradiates the laser 103 from the laser head 102 while moving along a predetermined cutting path while maintaining a predetermined angle α with respect to the cut portion of the original sheet 110 of the decorative sheet. Thus, the original fabric 110 is shaped into a decorative sheet having a target shape. In this way, by irradiating the laser 103 while maintaining a predetermined angle α from the adhesive layer 5 side of the original fabric 110, the decorative sheet 10 having the cut surface 10E as shown in FIG. Is obtained.

  The angle α of the cut surface of the decorative sheet with respect to the vertical plane with respect to the surface of the leather-like sheet is 30 degrees or more, and further 40 degrees or more sufficiently exposes the hot melt adhesive layer. It is preferable from the point. Although the upper limit of angle (alpha) is not specifically limited, It is preferable from the point of workability that it is 80 degree | times and also 75 degree | times.

  The decorative sheet of this embodiment is a case of a single-lens reflex camera or a compact digital camera, a camera grip, a mobile terminal body (smartphone, tablet PC) and its case, an accessory such as a cover, a vehicle interior material, a cosmetic case, etc. It is preferably used for decorating the surface of the resin molded body in leather.

  FIG. 7 shows a partial schematic diagram of a decorative keyboard 60 obtained by bonding the decorative sheet 10 to both surfaces of a thin keyboard of a tablet PC as an example of the use of the decorative sheet 10 of the present embodiment. FIG. 7A is a schematic perspective view, and FIG. 7B is a schematic diagram of the AA ′ cross section of FIG. As shown to Fig.7 (a), the decorating keyboard 60 has bonded the decoration sheet | seat 10 on the upper surface and lower surface of the main body of the keyboard 19 with which the key 17 was distribute | arranged on the surface of the board | substrate 18, respectively. And as shown in FIG.7 (b), the two sheets 10 for decorating are mutually adhere | attached with the hot-melt-adhesive layer 3 at the end surface. Further, one end of the decorative sheet 10 on the upper surface is bonded to the surface of the substrate 18. In such a decorative keyboard 60, the cut surface of the decorative sheet 10 is bonded to another member with the hot melt adhesive layer 3, so that the end face is excellent in appearance and wear resistance is improved. doing. Such adhesion can be easily processed by hot pressing as described above. Therefore, it can cope with mass production.

  Next, the configuration of the decorative sheet will be described in detail. The decorative sheet includes a leather-like sheet including a fiber base material, a surface resin layer, and a hot-melt adhesive layer interposed between the fiber base material and the surface resin layer.

  A leather-like sheet is a sheet base material that resembles leather such as artificial leather or synthetic leather. Artificial leather has, as a decorative surface, a surface resin layer having a silver-like surface resembling the appearance of the silver surface of leather on the surface of a fiber substrate such as a nonwoven fabric impregnated with a polymer elastic body such as polyurethane. Synthetic leather is obtained by laminating an elastic layer mainly composed of thick soft vinyl chloride or the like on the surface of a fabric. In the present embodiment, artificial leather will be described as a representative example in detail.

  A decorative sheet 10 as shown in FIG. 1 is a leather-like body comprising a fiber substrate 1, a surface resin layer 2, and a hot melt adhesive layer 3 that bonds the fiber substrate 1 and the surface resin layer 2. A sheet 4 is provided, and an adhesive layer 5 is further provided on the back surface of the fiber substrate 1 for bonding to a member.

  Examples of the fiber base material include a nonwoven fabric impregnated with a polymer elastic body as necessary. Among nonwoven fabrics, ultrafine fiber nonwoven fabrics are particularly preferable. Since the nonwoven fabric of ultrafine fibers has a dense fiber density, the density unevenness of the fibers is small and the homogeneity is high. Therefore, artificial leather excellent in flexibility and high sense of fulfillment can be obtained. In this embodiment, the case where a fiber base material including a non-woven fabric of ultrafine fibers is used will be described in detail.

  The nonwoven fabric of ultrafine fibers can be obtained, for example, by entanglement treatment of ultrafine fiber-generating fibers such as sea-island type (matrix-domain type) composite fibers and the ultrafine fiber treatment. In the present embodiment, the case where the sea-island type composite fiber is used will be described in detail. However, even if an ultrafine fiber-generating fiber other than the sea-island type composite fiber is used, it is directly used without using the ultrafine fiber-generating fiber. Ultra fine fibers may be spun. In addition, as a specific example of the ultrafine fiber generation type fiber other than the sea-island type composite fiber, a plurality of ultrafine fibers are formed by lightly bonding immediately after spinning, and a plurality of ultrafine fibers are formed by unraveling by mechanical operation. Such as a split-divided fiber, or a petal-type fiber in which a plurality of resins are alternately gathered in a petal shape in the melt spinning process, and any fiber that can form ultrafine fibers is used without particular limitation. It is done.

  In the production of the ultrafine fiber nonwoven fabric, the island of the sea-island type composite fiber that is the resin component that forms the sea component (matrix component) of the sea-island type composite fiber that can be selectively removed and the resin component that forms the ultrafine fiber are first introduced. A sea-island type composite fiber is obtained by melt spinning and stretching a thermoplastic resin constituting the component (domain component).

  As the sea component thermoplastic resin, a thermoplastic resin having a different solubility in a solvent or a decomposability in a decomposing agent is selected from the island component resin. Specific examples of the thermoplastic resin constituting the sea component include, for example, a water-soluble polyvinyl alcohol resin, polyethylene, polypropylene, polystyrene, ethylene propylene resin, ethylene vinyl acetate resin, styrene ethylene resin, styrene acrylic resin, and the like. .

  The thermoplastic resin, which is a resin component that forms island components and forms ultrafine fibers, is not particularly limited as long as it is a resin capable of forming sea-island composite fibers and ultrafine fibers. Specifically, for example, polyethylene terephthalate (PET), isophthalic acid modified PET, sulfoisophthalic acid modified PET, polybutylene terephthalate, polyhexamethylene terephthalate and other aromatic polyesters; polylactic acid, polyethylene succinate, polybutylene succinate, Aliphatic polyesters such as polybutylene succinate adipate, polyhydroxybutyrate-polyhydroxyvalerate resin; polyamides such as polyamide 6, polyamide 66, polyamide 10, polyamide 11, polyamide 12, polyamide 6-12; polypropylene, polyethylene, polybutene , Polyolefins such as polymethylpentene and chlorinated polyolefin. These may be used alone or in combination of two or more.

  As a method for producing a nonwoven fabric of ultrafine fibers, for example, a sea-island composite fiber is melt-spun to produce a web, the web is entangled, and then sea components are selectively removed from the sea-island composite fiber. The method of forming is mentioned. As a method for producing a web, a long-fiber sea-island composite fiber spun by a spunbond method or the like is collected on a net without being cut to form a long-fiber web, or a long fiber is cut into staples. And a method of forming a short fiber web. Among these, a long fiber web is particularly preferable because it is excellent in denseness and fullness. In addition, the formed web may be subjected to a fusion treatment in order to impart shape stability.

  In addition, a long fiber means a continuous fiber that is not a short fiber intentionally cut after spinning. More specifically, for example, it means a fiber that is not a short fiber intentionally cut so that the fiber length is about 3 to 80 mm. It is preferable that the fiber length of the sea-island type composite fiber before the ultrafine fiber formation is 100 mm or more, and it can be technically manufactured and unavoidably cut in the manufacturing process. The fiber length may be km or more. In addition, a part of long fiber may be inevitably cut | disconnected and become a short fiber in a manufacturing process by the needle punch at the time of the entanglement mentioned later, or buffing of the surface.

  Sea island type composite fiber is densified by performing fiber shrinkage treatment such as entanglement treatment and heat shrink treatment with water vapor in any process from removing sea components of sea island type composite fiber to forming ultra fine fiber can do. Examples of the entanglement treatment include a method of stacking about 5 to 100 webs and performing needle punching or high-pressure water flow treatment.

  The sea component of the sea-island type composite fiber is removed by dissolution or decomposition at an appropriate stage after the web is formed. By such decomposition removal or dissolution extraction removal, the sea-island type composite fibers are made into ultrafine fibers, and fiber bundle-like ultrafine fibers are formed.

  The fineness of the ultrafine fibers is not particularly limited, but is preferably 0.001 to 0.9 dtex, more preferably 0.01 to 0.6 dtex, and particularly preferably 0.02 to 0.5 dtex. When the fineness is too high, there is a tendency that a non-woven fabric with insufficient density is obtained. Moreover, it is difficult to produce a fiber having a fineness that is too low. Moreover, there exists a tendency for fibers to converge and the rigidity of a nonwoven fabric to become high.

  The ultrafine fiber nonwoven fabric thus obtained is subjected to thickness adjustment and flattening treatment as necessary. Specifically, slice processing and buffing processing are performed. In this way, an ultrafine fiber nonwoven fabric is obtained.

  The voids of the nonwoven fabric are impregnated and impregnated with a polymer elastic body, if necessary, at any stage of the pre-process, the post-process, or both the processes before and after the ultrafine fiber formation. Examples of a method for impregnating and applying a polymer elastic body include a method in which a nonwoven fabric is impregnated with a water-based emulsion of a polymer elastic body and a roll / nip treatment is performed.

  As the water-based emulsion of the polymer elastic body, those conventionally used when producing artificial leather can be used without any particular limitation.

  Specific examples of the polymer elastic body include, for example, polyurethane, acrylic elastic body, silicone elastic body, diene elastic body, nitrile elastic body, fluorine elastic body, polystyrene elastic body, polyolefin elastic body, and polyamide. System elastic body, halogen-based elastic body and the like. These may be used alone or in combination of two or more. Among these, polyurethane is preferable from the viewpoint of excellent wear resistance and mechanical properties.

  The polyurethane is preferably an aqueous polyurethane such as polycarbonate polyurethane, polyester polyurethane, polyether polyurethane, or polycarbonate / ether polyurethane emulsion. These polyurethanes are particularly preferable because the dispersion is easily prepared, a crosslinked structure is easily formed, and a soft texture is easily exhibited by being present in the voids without being too close to the fibers.

  The amount of the polymer elastic body imparted to the nonwoven fabric is not particularly limited, but the amount of the polymer elastic body (solid content) relative to 100 mass parts of the nonwoven fabric is 1 to 80 mass parts, more preferably 2 to 60 mass parts, particularly. Is preferably 5 to 40 parts by mass. If the amount of the polymer elastic body is too small, the shape stability tends to decrease, and if it is too large, an artificial leather having a strong rubber feeling tends to be obtained.

  In this way, a fiber base material in which a void between the fibers of the nonwoven fabric is impregnated with the polymer elastic body is obtained.

  The fiber base material obtained by the method as described above is subjected to thickness adjustment and flattening treatment by slicing or buffing treatment as necessary, stagnation softening treatment, blanking softening treatment, reverse sealing Finishing treatments such as brushing treatment, antifouling treatment, hydrophilization treatment, lubricant treatment, softener treatment, antioxidant treatment, ultraviolet absorber treatment, fluorescent agent treatment, flame retardant treatment and the like may be performed.

  The thickness of the fiber substrate thus obtained is not particularly limited, but is preferably about 100 to 3000 μm, more preferably about 300 to 2000 μm.

  And the artificial leather is obtained by forming the surface resin layer used as a decorating surface through a hot-melt-adhesive agent layer in the fiber base material obtained in this way.

  The method for forming the hot melt adhesive layer and the surface resin layer on the fiber substrate is not particularly limited, and examples thereof include the following dry surface forming method.

  In the dry surface-forming method, a resin solution for forming a surface resin layer is applied on a release paper, and then the resin solution is solidified to form a film of the surface resin layer. Further, a hot melt adhesive for forming a hot melt adhesive layer is applied to the surface of the surface resin layer, and a fiber base material is bonded and bonded thereto. And after adhesion | attachment, an artificial leather is obtained by peeling a release paper.

  Examples of the resin component for forming the surface resin layer include polyurethane, acrylic elastic body, silicone elastic body, diene elastic body, nitrile elastic body, fluorine elastic body, polystyrene elastic body, and polyolefin elastic body. Body, polyamide-based elastic body, elastomer-based emulsion such as halogen-based elastic body, suspension, dispersion, or resin solution such as solution. These may be used alone or in combination of two or more. Of these, polyurethane emulsions are preferred because of their excellent wear resistance and mechanical properties. In addition, the resin component may contain a crosslinking agent, a colorant, an ultraviolet absorber, a surfactant, a flame retardant, an antioxidant, and the like as necessary.

  The thickness of the surface resin layer is preferably 10 to 1000 μm, more preferably 50 to 300 μm. Further, a texture pattern or the like may be formed on the surface resin layer.

  The properties of the hot melt adhesive are usually solid at room temperature. Therefore, the formed hot melt adhesive layer is solid. Such a hot-melt adhesive is usually applied by melting it to a viscosity at which a solventless solid hot-melt adhesive can be applied. However, when a melted hot melt adhesive is applied to the surface resin layer film to form a hot melt adhesive layer, the polymer elastic sheet receives a thermal history. Therefore, in order to avoid such a heat history, it is preferable to form a coating film using a solution type hot melt adhesive in which a solid hot melt adhesive is dissolved in a solvent.

  The hot-melt adhesive is not particularly limited as long as it is a conventionally known hot-melt adhesive that melts by heating and then re-solidifies by being cooled. Specific examples include hot melt adhesives such as polyurethane, polyester, polyolefin, acrylic, vinyl acetate, polystyrene, and epoxy. Moreover, as a hot-melt-type adhesive agent, any of a crosslinked type, a semi-crosslinked type, and a non-crosslinked type may be sufficient. In addition, a hot melt urethane adhesive having a softening temperature of 150 ° C. or lower, more preferably 130 ° C. or lower, is particularly preferable because of excellent thermocompression bonding of the cut surface. The softening temperature is measured, for example, by preparing a dry film of 50 μm, then increasing the temperature at a constant temperature while applying a constant load, and specifying the temperature at which it begins to grow sharply or the temperature at which it cuts sharply. be able to.

  The thickness of the hot melt adhesive layer is preferably 10 to 500 μm, more preferably 30 to 200 μm. When the thickness of the hot melt adhesive layer is too thin, the hot melt adhesive layer is not exposed on the cut surface, and the thermocompression bonding property tends to be lowered. Moreover, when the thickness of the hot melt adhesive layer is too thick, the heat resistance tends to decrease.

  A coating film was formed on the surface of the surface resin layer film formed on the release paper using a solution-type hot-melt adhesive, and the solvent in the solution was prepared in advance before drying. The fiber base material and the film of the surface resin layer are bonded via the hot melt adhesive layer by pasting the fiber base material and drying and removing the solvent. In this way, artificial leather is obtained.

  By forming the adhesive layer on the surface opposite to the surface on which the surface resin layer of the artificial leather thus obtained is formed, a decorative sheet to be bonded to the article is obtained.

  The adhesive layer is formed by attaching a double-sided adhesive tape to the surface of the artificial leather fiber base where the decorative surface is not formed, or by laminating an adhesive layer. .

  The adhesive for forming the adhesive layer is not particularly limited, and examples thereof include polyurethane, polyester, polyolefin, acrylic, vinyl acetate, polystyrene, and epoxy adhesives. . Among these, polyurethane adhesives, in particular, hot melt type polyurethane adhesives are preferable from the viewpoint of excellent productivity.

  The thickness of the adhesive layer is 10 to 150 μm, preferably 20 to 130 μm, and more preferably 30 to 120 μm. When the thickness of the adhesive layer is too thin, the adhesiveness tends to decrease. Moreover, when the thickness of an adhesive layer is too thick, since solidification time becomes long, there exists a tendency for work efficiency to fall, and since the thickness of the sheet | seat for decorating obtained becomes too thick, it is unpreferable.

  In addition, when bonding a double-sided adhesive tape as an adhesive layer, tension is applied in the extension direction so that the wrinkles of the fiber base material are removed. At this time, when the tensile strength of the fiber base material is low, the fiber base material is elastically deformed, and the double-sided pressure-sensitive adhesive tape may be wrinkled when the tension is removed after the double-sided pressure-sensitive adhesive tape is bonded. In order to suppress the occurrence of such wrinkles, artificial leather using a fiber base material including a non-woven fabric of ultrafine fibers, in particular, 0.5 kg / 25 mm or more as the 5% tensile strength of the fiber base material, and It is preferably 0 kg / 25 mm or more. When such artificial leather is used, it is difficult to elastically deform when tension is applied in the extending direction, and it does not shrink when the tension is removed. Is suppressed.

  When the original fabric of the decorative sheet thus obtained is shaped into the target decorative sheet shape by the method as described above, an inclination of 30 degrees or more with respect to the vertical plane is obtained. The decorative sheet of this embodiment is obtained by forming the cut surface to hold.

  The decorative sheet of the present invention is a resin such as a case of a single-lens reflex camera or a compact digital camera, a camera grip, a mobile terminal body (smartphone, tablet PC) and its case, cover and other accessories, a vehicle interior material, and a cosmetic case. It is preferably used for decorating the surface of the molded body in leather.

DESCRIPTION OF SYMBOLS 10,90 Decorating sheet 1 Fiber substrate 2 Surface resin layer 3 Hot melt adhesive layer 4 Leather-like sheet 5 Adhesive layer 6,36 Hot press mold 6a, 36a Upper mold 6b, 36b Lower mold 36c Projection part 8 Member 10d Mold pressing part 16 Hot press jig 17 Key 18 Substrate 19 Keyboard 20, 30, 40 Decorating article 26a Upper welding jig 26b Lower welding jig 30a Bonding surface 60 Decorating keyboard 100 Laser cut Device 101 Laser oscillator 102 Laser head 103 Laser 9,105 Table Ax Vertical surface 10a, 10b, 10c, 10d End surface 10E, 90F Cut surface

Claims (12)

A decorative sheet for decorating an article,
A fiber base material, a surface resin layer, and a hot melt adhesive layer interposed between the fiber base material and the surface resin layer,
A decorative sheet having a cut surface having an inclination of 30 degrees or more with respect to a surface perpendicular to the upper surface with the surface resin layer as an upper surface.   The decorative sheet according to claim 1, wherein the cut surface is a laser-cut cut surface.   The decorative sheet according to claim 1, further comprising an adhesive layer for bonding to the surface of the article.   The decorating sheet according to any one of claims 1 to 3, wherein the adhesive layer is a layer formed of a double-sided pressure-sensitive adhesive tape or an adhesive.   The said fiber base material is a sheet | seat for decorating of any one of Claims 1-4 containing the entanglement body of the fiber bundle of the ultrafine fiber of fineness 0.8dtex or less. A decorative article obtained by bonding the decorative sheet according to any one of claims 1 to 5 to the surface of the article,
The decorative article in which the cut surface of the decorative sheet is folded and bonded to the article or the decorative sheet with the hot melt adhesive layer. A decorative article obtained by bonding the decorative sheet according to any one of claims 1 to 5 to the surface of the article,
A decorative article, wherein a cut surface of the decorative sheet is bonded to the surface of the article with the hot melt adhesive layer. The article is an article having a first surface and a second surface facing each other;
Each of the first surface and the second surface is a decorative article obtained by bonding the decorative sheet according to any one of claims 1 to 5,
The decorative article in which the cut surfaces of the decorative sheet respectively disposed on the first surface and the second surface are bonded to each other with the hot melt adhesive layer. A decorative article according to any one of claims 6 to 8,
A decorative article further comprising a line formed on the surface of the decorative sheet by being embossed while melting the hot melt adhesive layer. A step of bonding the decorative sheet according to any one of claims 1 to 5 on the surface of the article so that the cut surface protrudes;
Folding the cut surface so that the surface resin layer is on the outside;
And a step of thermocompression-bonding the folded cut surface and bonding with the hot melt adhesive layer. A step of bonding the decorative sheet according to any one of claims 1 to 5 to the surface of the article;
And a step of thermocompression bonding the cut surface to the surface of the article and adhering with the hot melt adhesive layer. The article has a first surface and a second surface facing each other, and the decorative sheet according to any one of claims 1 to 5 is provided on both surfaces of the first surface and the second surface, respectively. A step of bonding so that the cut surfaces overlap each other;
And a step of thermocompression bonding the cut surfaces and bonding with the hot melt adhesive layer.

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