JP2001018591A - Recess and projection transfer sheet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make the recess and projection follow-up properties of a recess and projection transfer sheet compatible with the stability with time of the release strength of a recess and projection transfer sheet in a curved surface transfer method utilizing the solid particle impact pressure. SOLUTION: A substrate sheet 10 of a recess and projection transfer sheet S is constituted at least of two layers consisting of a polypropylene layer 12 composed of a mixture of a hard cement of isotactic polypropylene and a soft cement of isotactic polypropylene and a surface layer 11 composed of an ethylene-propylene random copolymer laminated on the transfer layer side of the polypropylene layer. Alternatively the substrate sheet can be constituted of three layers, namely a back layer composed of the ethylene-propylene random copolymer and laminated formed on the back of the polypropylene layer in addition to the above two layers.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transfer method suitable for manufacturing a transfer decoration product of a substrate to be transferred having irregularities, such as an interior material and an exterior material of a building, by a curved surface transfer method utilizing solid particle impact pressure. The present invention relates to an uneven transfer sheet as a sheet.

[0002]

2. Description of the Related Art Conventionally, various types of decorative plates having a concave-convex surface with a concave-convex surface formed by decorating an irregular-transferred substrate having a concave-convex surface with a transfer surface have been used. As a transfer method, even if a conventional roller transfer method is used, if a soft rubber or the like is used for the transfer roller, it is possible to have a certain uneven surface. The uneven transfer sheet is used as a support sheet for laminating a transfer layer, such as a thermoplastic resin sheet made of a vinyl chloride resin or the like, in order to have moldability so that it can follow the uneven surface (elongates at the time of transfer heating). Is used.

On the other hand, recently, as a curved surface transfer method capable of transferring an uneven surface which is impossible with the conventional roller transfer method,
A transfer method using a solid particle collision pressure as a transfer pressure has been proposed (Japanese Patent No. 2844424, etc., Japanese Patent Application Laid-Open No. 10-1938).
No. 93, etc.). That is, this curved surface transfer method
As shown in the conceptual diagram of FIG. 3, the transfer layer side of the uneven transfer sheet S including the support sheet 10 and the transfer layer 20 is provided on the transfer surface side of the uneven transfer base material B having the uneven transfer surface. And a large number of solid particles P collide against the support sheet 10 side of the uneven transfer sheet S, and the uneven transfer sheet S follows the uneven transfer base material B by utilizing the collision pressure. This is a transfer method in which the transfer is performed by pressure bonding, followed by peeling and removing the support sheet 10. The arrow added to the solid particles P indicates a velocity vector of the solid particles. Note that, in the conceptual diagram of FIG. 1, an adhesive layer appropriately formed on the uneven transfer-receiving substrate or the like is not shown.

[0004]

However, the curved surface transfer method utilizing the solid particle collision pressure is an extremely excellent transfer method which can be applied to a deep three-dimensional uneven surface or the like which cannot be achieved by the conventional curved surface transfer method. Because of this method, the transfer sheet to be used, that is, the uneven transfer sheet, is required to have a high-performance uneven follow-up property which has never existed before. For this reason, a resin sheet having good unevenness followability is used as the support sheet that governs the unevenness followability of the unevenness transfer sheet. In addition, although the vinyl chloride resin sheet is a resin sheet that has good conformability to irregularities,
Addition of a plasticizer is indispensable for imparting irregularity followability, and the plasticizer oozes out and migrates (bleeds) to the surface over time. For this reason, there has been a problem that the plasticizer easily migrates to the transfer layer and changes the releasability and physical properties of the transfer layer, and easily migrates to the adhesive layer to change the adhesive strength. Further, from the viewpoint of global environmental problems in recent years, a vinyl chloride resin sheet that generates hydrogen chloride gas at the time of waste combustion should be avoided as a support sheet. Therefore, as a non-PVC-based support sheet, there is a support sheet using a polyolefin-based resin in terms of cost, availability, and the like. For example, (A) a support sheet comprising an ethylene-propylene random copolymer, or (B) a support sheet using a homopolypropylene resin comprising a mixture of a hard segment of isotactic polypropylene and a soft segment of atactic polypropylene. (JP-A-11-42749).

However, the uneven transfer sheet using a rigid ethylene-propylene random copolymer (3% by weight of ethylene) as a support sheet as the above (A) capable of printing a transfer layer is not suitable for uneven transfer. Insufficient ink was generated in the concave portion, and the transfer layer (concavo-convex transfer sheet) was not pressed. However, there is no increase in the peel strength of the transfer layer over time.
Further, as the above (B), a homopolypropylene resin of a mixture of a rigid segment of isotactic polypropylene and a soft segment of atactic polypropylene (atactic polypropylene 20% by weight) having a rigidity capable of printing a transfer layer is used as a support sheet. In the case of the uneven transfer sheet used in the above, the followability of the unevenness is good, and even in the recesses which cause the above problem, the transfer can be performed without the ink floating due to the non-compression of the transfer layer. However, when this uneven transfer sheet is left at 40 ° C. for one week and then transferred again in the same manner,
The peeling of the support sheet becomes heavy, and the transfer layer is also peeled and removed together with the support sheet when the support sheet is peeled off, resulting in transfer omission. In addition, there is also a problem that blocking is likely to occur during winding storage.

Accordingly, an object of the present invention is to provide an irregularity transfer sheet using a polyolefin-based resin as a support sheet used in a curved surface transfer method utilizing solid particle impact pressure, which has been conventionally incompatible with good irregularity followability. And the stability of the peel strength over time.

[0007]

Therefore, in order to solve the above problems, in the uneven transfer sheet of the present invention, a transfer layer is laminated on a support sheet of a polyolefin resin with respect to the uneven transfer receiving base material. The transfer layer side of the uneven transfer sheet
A curved surface on which the solid particles collide against the support sheet side in opposition to the uneven transfer receiving substrate, and the pressure is transferred by pressing the uneven transfer sheet so as to follow the uneven transfer substrate by using the collision pressure. In the concavo-convex transfer sheet used for the transfer method, the support sheet was laminated on a polypropylene layer made of a mixture of a hard segment of isotactic polypropylene and a soft segment of atactic polypropylene, and on the transfer layer side of the polypropylene layer. It is configured to be composed of at least two layers with a surface layer composed of an ethylene-propylene random copolymer.

By providing a support sheet of at least two layers composed of the specified resin including the surface layer on the transfer layer side as described above, excellent conformability to unevenness and stability of the peel strength with the transfer layer over time can be obtained. Sex is compatible.

[0009] The uneven transfer sheet of the present invention, in the above structure, further comprises a support sheet, a back layer of an ethylene-propylene random copolymer further laminated on the back side of the polypropylene layer, The structure was composed of three layers, a polypropylene layer and a back layer.

As described above, by forming the support sheet into a three-layer structure in which the surface layer and the back layer are made of the same kind of resin, warpage and curling of the uneven transfer sheet during production, storage, use, and the like can be achieved. Prevent outbreak. In addition, the occurrence of blocking during winding and storage can be prevented.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the uneven transfer sheet of the present invention will be described. 1 and 2
Is a cross-sectional view illustrating an example of the form of the uneven transfer sheet of the present invention, FIG. 3 is a conceptual diagram illustrating a curved surface transfer method using solid particle collision pressure, and FIGS. FIG. 7 is an explanatory view of an ejector used for ejecting solid particles, FIG. 7 is a perspective view showing an uneven shape of an uneven transfer-receiving substrate for evaluating unevenness followability, and FIG. 8 is a conceptual diagram illustrating a method of measuring peel strength.

[Support Sheet] The support sheet 10 is composed of at least two layers, as shown in the cross-sectional view of the unevenness transfer sheet S of the present invention shown as an embodiment in FIGS. 1 and 2, and is made of isotactic polypropylene. It comprises a polypropylene layer 12 made of a mixture of a hard segment and a soft segment of atactic polypropylene, and a surface layer 11 made of an ethylene-propylene random copolymer laminated on the transfer layer side of the polypropylene layer 12. Also,
As illustrated in FIG. 2, the support sheet 10 further includes a back layer 13 made of an ethylene-propylene random copolymer laminated on the back side of the polypropylene layer 12, and the support sheet 10 is configured from these three layers. Is also good.

The support sheet 10 has a layer made of an ethylene-propylene random copolymer as a surface layer 11 on the side in contact with the transfer layer, in addition to the polypropylene layer made of the specific resin, so that the polypropylene layer has While maintaining the irregularity followability required in the curved surface transfer method using the solid particle impact pressure, the temporal instability of the peel strength that may occur when the polypropylene layer contacts the transfer layer (the peel strength increases Can be solved.

Further, like the support sheet 10 of the unevenness transfer sheet S shown in FIG. 2, a layer made of an ethylene-propylene random copolymer is further laminated on the back side of the support sheet 10 as a back layer 13. Since the front and back sides of the polypropylene layer are layers of the same (or the same type) ethylene-propylene random copolymer, in the case of the two-layer structure illustrated in FIG. It also prevents warpage and curling during manufacturing, storage, use, etc. caused by differences. In addition, the occurrence of blocking during winding and storage can be prevented.

The above-mentioned polypropylene layer 12 is composed of a mixture of a hard segment of isotactic polypropylene and a soft segment of atactic polypropylene, but the isotactic polypropylene as a hard segment and the atactic polypropylene as a soft segment are For example, the following polypropylene can be used. That is, as the isotactic polypropylene as the hard segment, a heptane-insoluble isotactic polypropylene having a melt index of 0.1 to 4 g / 10 min is used, and as the atactic polypropylene as the soft segment, the number average molecular weight Mn is 25,000 or more, and the ratio Mw / Mn of the weight average molecular weight Mw to the number average molecular weight Mn ≦
7, atactic polypropylene soluble in boiling heptane.

The ratio between the isotactic polypropylene and the atactic polypropylene is appropriately determined depending on the conformability to irregularities, the printability of the transfer layer, etc. Usually, the weight ratio of the atactic polypropylene to the total amount is 5%.
The range of ５０50% by weight is preferred.

When a polypropylene comprising a mixture of an isotactic polypropylene and an atactic polypropylene is used in a conventionally known application such as a packaging container, the weight of the atactic polypropylene as a soft segment is important in order to emphasize strength. Those with a ratio of less than 5% by weight were exclusively used. However, as described in the present invention, in particular, it is preferable to use the uneven surface transfer method using a solid particle collision pressure to transfer the uneven surface to the uneven transfer substrate having the three-dimensional uneven surface. When used on the support sheet to give it to
Necking occurred when the film extended, and the followability of unevenness was insufficient.

Therefore, contrary to the conventional composition design, by setting the weight ratio of the atactic polypropylene to 5% by weight or more, deformation of the uneven support sheet (unevenness transfer sheet) due to necking and its deformation are considered. Defects such as wrinkles and pattern distortion as a result can be eliminated, and sufficient unevenness followability can be ensured. Particularly, the case where the weight ratio of the atactic polypropylene is 20% by weight or more is preferable. On the other hand, if the weight ratio of the atactic polypropylene increases too much, the support sheet itself tends to be deformed, the support sheet is deformed when the support sheet is passed through a printing machine, the pattern is distorted, and multicolor printing is not performed. In such a case, defects such as misregistration are likely to occur. Further, it is not preferable because the film is easily broken during transfer. As the upper limit of the weight ratio of the atactic polypropylene, a transfer layer such as a pattern ink layer and a release layer is printed using a normal rotary printing machine such as a rotary gravure printing.
In the case of applying a curved surface transfer method using solid particle collision pressure as a coating method and a transfer method, the content is preferably 50% by weight or less, more preferably 40% by weight or less.

Such a polypropylene layer can be prepared as a sheet (film) by a conventionally known film forming method such as a calendering method, an inflation method or a T-die extrusion method. Further, as described later, it can be prepared by forming a film simultaneously with lamination by a T-die coextrusion method with a surface layer or a back layer.

Further, the polypropylene layer should have a conformability to irregularities and mechanical strength equal to or higher than that of a conventionally used semi-rigid (plasticizer content of 10 to 30 phr in terms of dioctyl phthalate) vinyl chloride resin. Is desirable.
Therefore, the breaking strength at 25 ° C. is 300 to 400.
kg / cm ² , elongation at break at 25 ° C. is 150-180%, 70
In breaking strength in ° C. elongation at break of at 200~300kg / cm ^2, 70 ℃ is preferably constructed from 160 to 200% of the sheet. The measured value is a value based on JIS-K-6734. If the breaking strength at 25 ° C. exceeds this value, or if the breaking elongation is less than this value, the conformability to irregularities at room temperature is insufficient. At 70 ° C., the breaking strength exceeds this value, or If the elongation is less than this value, the conformability to irregularities during heat molding (usually about 70 ° C. to 150 ° C.) is insufficient.
If the breaking strength at 25 ° C. is less than this value, the sheet for uneven transfer tends to break at the time of molding at room temperature, and if the breaking elongation at 25 ° C. exceeds this value, the registration accuracy during multicolor printing. Becomes defective. Whether the breaking strength at 70 ° C. is less than this value,
When the elongation at break exceeds this value, the distortion of the picture when the uneven transfer sheet is formed and follows the uneven shape becomes remarkable.

The surface layer 11 and the back layer 13 are both made of an ethylene-propylene random copolymer. In addition, surface layer 1
1 and the back layer 13 may use random ethylene-propylene copolymers having different contents (copolymerization ratio, average molecular weight, additives, etc.), but from the viewpoint of curling prevention, they are completely the same or substantially the same. It is preferable to use the ethylene-propylene random copolymer of the above. In addition, the ethylene-propylene random copolymer has a copolymerization ratio of 1 to 1 in ethylene ratio.
Usually about 10% by weight is used.

The surface layer 11 is a layer that imparts (stable with time) releasability to the transfer layer, so that it is necessary that the surface layer 11 has a minimum thickness necessary for reliable film formation and stable peeling. . If it is too thick, the conformability of the entire support sheet will be reduced. Therefore, the thickness is usually at least about 5 μm and at most about 20% of the total thickness of the support sheet. In this connection, it is preferable that the polypropylene layer is thicker (having a large thickness ratio) as long as it does not hinder transfer layer peeling. Even in the case of a three-layer structure having a back layer in addition to a surface layer, at least a support sheet is required. 60% of total thickness
Above. The total thickness of the support sheet is preferably about 50 to 100 μm in consideration of the balance between the strength of the support sheet and the ability to follow irregularities.

With the support sheet having the above-described structure, the support sheet can be formed without using a vinyl chloride resin, and does not generate hydrochloric acid gas at the time of waste combustion, and is environmentally friendly. Is also a preferred support sheet.

[Transfer Layer] The transfer layer 20 to be laminated on the support sheet 10 is not particularly limited, and the material and configuration of the transfer layer in various conventionally known transfer sheets can be adopted.

That is, when the transfer layer 20 is transferred from the concavo-convex transfer sheet to the transfer substrate side by transfer, the transfer layer 20 usually comprises at least a decorative layer, and further appropriately transfers a release layer, an adhesive layer and the like. It may be a component of a layer. Incidentally, the transfer layer is a functional layer, an antibacterial layer, an antifungal layer,
A layer having various functions such as a conductive layer may be used. Also, as in the case of sublimation transfer, the entire transfer layer does not move to the transfer-receiving substrate side, and only a transfer-transfer substance such as a sublimable dye in the transfer layer moves to the uneven transfer-receiving substrate side. is there. The transfer layer is formed by an arbitrary forming means such as a conventionally known printing method, coating method, or hand-drawing.

The decorative layer may be formed by, for example, a conventionally known method such as gravure printing, silk screen printing, offset printing, gravure offset printing, or ink jet printing, a pattern layer formed by printing a pattern or the like with a material, aluminum,
A metal thin film layer or the like in which a metal such as chromium, gold, silver or the like is partially or entirely formed by using a known vapor deposition method or the like. As the pattern, in accordance with the surface irregularities of the transferred substrate, wood pattern, stone pattern, cloth pattern, tile pattern, brick pattern, leather pattern, letters, geometric pattern,
Use solid on the whole surface. The ink (or coating liquid) for the picture layer, like a general ink (or coating liquid), includes a vehicle made of a binder and the like, a coloring agent such as a pigment and a dye, and various additives appropriately added thereto. Acrylic resin, vinyl chloride-vinyl acetate copolymer,
A simple substance such as a polyester resin, a cellulosic resin, or a polyurethane resin or a mixture containing these is used. As a coloring agent, titanium white, carbon black, red iron oxide, graphite, inorganic pigments such as ultramarine blue, aniline black, quinacridone, isoindolinone, organic pigments such as phthalocyanine blue,
Bright pigments such as aluminum foil powder, titanium dioxide-coated mica foil powder, and other dyes are used.

The release layer may be formed in the same manner as a conventionally known transfer sheet in order to adjust the releasability between the support sheet and the transfer layer and to protect the surface of the transfer layer after the transfer. May be provided as needed on the side of the support sheet. For the release layer, for example, a resin or the like used as a binder of the picture layer ink is used. The release layer is transferred to the substrate side together with the decorative layer at the time of transfer, and covers the surface of the decorative layer.

[Adhesive] The adhesive may be used as an adhesive layer constituting a transfer layer of an uneven transfer sheet, or as an adhesive layer on an uneven transfer-receiving substrate, before or immediately before transfer, by online coating or the like. Apply by offline coating. In the case of applying to an uneven transfer base material, the adhesive layer on the uneven transfer sheet side can be omitted.
Examples of the adhesive to be used include a heat-sensitive adhesive, a moisture-curable heat-sensitive adhesive, a hot-melt adhesive, a moisture-curable hot-melt adhesive, a two-component curable adhesive, an ionizing radiation-curable adhesive, and an aqueous adhesive. An adhesive or a pressure-sensitive adhesive using a pressure-sensitive adhesive is used. As the heat-sensitive adhesive, there are a heat-sealing type using a thermoplastic resin and a thermosetting type using a thermosetting resin. The adhesive may be diluted with a solvent or without a solvent, or may be a liquid or a solid at room temperature. In the case of an adhesive other than a pressure-sensitive adhesive exhibiting tackiness, a transfer layer can be formed with only a single adhesive layer. For example, heat-sensitive adhesives include polyvinyl acetate resin, vinyl chloride-vinyl acetate copolymer, acrylic resin,
A thermoplastic polyester resin, a thermoplastic urethane resin, a polyamide resin obtained by polycondensation of dimer acid and ethylenediamine, and the like are used. In addition, a phenol resin, a urea resin, a diallyl phthalate resin, a thermosetting urethane resin, an epoxy resin, or the like is used as the thermosetting adhesive.

The adhesive is applied to a sheet to be an uneven transfer sheet or an uneven transfer substrate by a conventionally known solution coating means such as a gravure roll coat, a spray coat, and a flow coat. Melt coating (melt coating) means using a hot melt adhesive with an applicator or the like can also be applied to the uneven transfer receiving substrate. The amount of the adhesive to be applied varies depending on the composition of the adhesive, the type and surface state of the substrate to be transferred, and is usually from 10 to 200 g / g.
m ² (solid content).

[Curved Surface Transfer Method Using Solid Particle Impact Pressure] The uneven transfer sheet of the present invention is used for a curved surface transfer method using solid particle impact pressure as a transfer pressure.
The curved surface transfer method will be described. The method of transferring a curved surface by the impact pressure of solid particles has recently been disclosed in Japanese Patent No. 2844424 and Japanese Patent Application Laid-Open No. 10-278492, and has already been described with reference to FIG. In this method, a large number of solid particles P are caused to collide with the support sheet 10 of the transfer sheet S, and the collision pressure is used as the transfer pressure to perform transfer. By the curved surface transfer method using the solid particle collision pressure, it is possible to transfer even to a large uneven surface which cannot be performed by a conventional curved surface transfer method such as a roller transfer method. Therefore, as in the case of the uneven transfer sheet of the present invention, there are problems to be solved, such as compatibility between unevenness followability and stability of peel strength over time.

As the solid particles P, ceramic beads,
Use non-metallic inorganic particles such as glass beads, metal particles such as zinc and iron, organic particles such as resin beads such as nylon beads and crosslinked rubber beads, or inorganic / resin composite particles composed of inorganic particles such as metal and resin. I do. The particle shape is preferably spherical, but other shapes can also be used. For example, metal zinc spheres are suitable solid particles in that the substrate is less likely to break due to impact on the substrate. The particle size is usually 10 to 100.
It is about 0 μm.

The solid particles are ejected from the ejector toward the uneven transfer sheet, and the pressure of the collision with the uneven transfer sheet becomes the transfer pressure. Typically, an impeller or a blowing nozzle is used for the ejector. The impeller accelerates the solid particles by its rotation, and the blowing nozzle accelerates the solid particles with a high-speed fluid flow. Sandblasting, shot blasting, shot peening and the like used in the blasting field can be used for the impeller and the blowing nozzle. For example, a centrifugal blast device is used for the impeller, and a pressurized or suction blast device, a wet blast device, or the like is used for the blowing nozzle. The centrifugal blast device accelerates and ejects solid particles by the rotational force of the impeller. A pressurized blasting device ejects solid particles together with air while being mixed with compressed air. The suction-type blast device sucks solid particles into a negative pressure portion generated by a high-speed flow of compressed air, and ejects the solid particles together with the air. The wet blast device mixes and ejects solid particles with a liquid. Among these, the impeller is one of the efficient and preferable ejectors in that the ejection amount of solid particles is large.

FIGS. 4 and 5 are conceptual diagrams showing an example of the ejector using the impeller. The impeller 812 includes a plurality of impellers 8.
13 is fixed on both sides by two side plates 814, and the center of rotation is a hollow portion 815 without the blade 813. Further, a direction controller 816 is provided inside the hollow portion 815 (see FIG. 5). The direction controller 816 has an opening 817 that is partially open in the circumferential direction, has a hollow cylindrical shape, and has the same rotation axis as the rotation axis of the impeller 812, and rotates independently of the impeller. It is free. When the impeller is used, the opening of the direction controller is fixed so as to face an appropriate direction, and the ejection direction of the solid particles is adjusted (see FIGS. 6A and 6B). Further, inside the directional controller, another impeller, which is hollow inside and has the same rotation axis as the rotation axis of the impeller 812, is provided as a sprayer 818 (see FIG. 5). Sprayer 8
18 rotates with the outer impeller 812. A rotating shaft 819 is fixed to the center of rotation of the side plate 814. The rotating shaft 819 is rotatably supported by a bearing 820, and is driven and rotated by a rotating power source (not shown) such as an electric motor. Rotates. The rotating shaft 819 does not penetrate between the two side plates 814 having the blades 813 therebetween, and forms a space without a shaft. Then, the solid particles P are supplied into the sprayer 818 from a hopper or the like through a transport pipe. Usually, the solid particles are supplied from above (directly above or obliquely above) the impeller. The solid particles supplied into the sprayer are scattered outward by the impeller of the sprayer. The scattered solid particles are emitted only in the direction allowed by the opening 817 of the direction controller 816 and supplied between the blades 813 of the outer impeller 812. Then, it collides with the blade 813 and is accelerated by the rotational force of the impeller 812,
It gushes from the impeller.

The size of the impeller 812 is usually 5 to 60 in diameter.
cm, the width of the blade is about 5 to 20 cm, the length of the blade is almost the diameter of the impeller, and the rotation speed of the impeller is 500 to
It is about 5000 [rpm]. The ejection speed of the solid particles is about 10 to 50 [m / s], and the projection density (total weight of the solid particles to be collided per unit area of the base material) is 10 to 150.
[Kg / m ² ].

In the case where the pressure area cannot be formed in a desired shape and size by using only one jetting device, a plurality of jetting devices are used. Further, when actually transferring using solid particles, it is preferable that the solid particles are not scattered in the surrounding atmosphere and circulated and reused. Should be caused to collide with the uneven transfer sheet. The peeling of the support sheet may be performed outside the chamber.

Preferably, the uneven transfer sheet is preliminarily heated and softened with an infrared radiation heater or the like to impart stretchability, and when the uneven transfer substrate has a large heat capacity, it is preheated in advance to form a heat-sealing type. The layer acting as the adhesive layer (depending on the case, a picture layer, an adhesive layer, etc.) is made to collide the solid particles with the uneven transfer sheet in a state of being activated by heating.
When transferring by thermal fusion, the timing of heating to activate and thermally fuse a layer to be thermally fused, such as an adhesive layer, is before applying the collision pressure, during the application of the collision pressure, or before applying the collision pressure. And during application. On the other hand, if the uneven transfer sheet follows the surface shape of the uneven transferred substrate, it is formed, and if the transfer layer is sufficiently in contact with the uneven transferred substrate, cooling of the heat-sealed layer by cooling means such as cold air is performed. May be promoted.
The cold air is blown, for example, from the uneven transfer sheet side or the uneven transfer receiving base material side.

[Substrate for Transferring Concavo-convex] The substrate B for transferring concavo-convex is not particularly limited as long as the surface to be transferred is a concavo-convex surface.
For example, the material of the concave and convex transfer base material is an inorganic nonmetal type, a metal type, a wood type, a plastic type, or the like. Specifically, in the inorganic nonmetal system, for example, papermaking cement, extruded cement, slag cement, ALC (lightweight cellular concrete), GRC (glass fiber reinforced concrete), pulp cement, wood chip cement, asbestos cement, calcium silicate, Non-porcelain ceramic materials such as gypsum and gypsum slag, earthenware,
There are inorganic materials such as ceramics such as pottery, porcelain, setware, glass, and enamel. In the case of metallic materials, for example, iron,
There are metal materials such as aluminum and copper. In the wood system, for example, there are a veneer, a plywood, a particle board, a fiber board, a laminated wood and the like made of cedar, cypress, oak, lauan, teak and the like. In the case of plastics, for example, there are resin materials such as polypropylene, ABS resin, and phenol resin.

The unevenness of the surface of the transferred surface of the uneven transfer-receiving substrate is arbitrary. For example, the surface irregularities usually have fine irregularities, for example, irregularities on spray-painted surfaces such as stucco, ricin, etc., cleaved surfaces of granite, travertine marble plates, irregularities on stone surfaces such as grain , Conduit grooves, raised annual rings, hairline, etc. In addition, as unevenness larger than fine unevenness, for example,
There are unevenness of joint grooves when a plurality of tiles or bricks are arranged on a plane, and uneven surface of a wood board such as a paneling pattern having joints, grooves, stirrups, seeds (real), and a floating wood grain pattern.

The substrate to be transferred has any shape, such as a flat plate, a bent plate, a column, or a three-dimensional object such as a molded product.
For example, the uneven transfer receiving base material as a whole (envelope shape)
In addition to the flat plate material, a substrate or the like having two-dimensional unevenness whose cross section is curved in one direction so as to be convex or concave in an arc shape may be used.

In addition, the surface of the substrate to be transferred having irregularities is
As a base treatment, if necessary, an easy-adhesion primer to assist in bonding with an adhesive, a sealer agent for preventing bleeding of an alkaline component when the base material to be transferred is an alkaline base material, or fine irregularities on the surface Alternatively, a sealant or the like for sealing and sealing the porosity may be formed by a coating method. The undercoating treatment also includes an undercoat paint (base coat) for adjusting the color of the undercoat (substrate to be transferred). A resin such as an isocyanate, a two-part curable urethane resin, an epoxy resin, an acrylic resin, or a vinyl acetate resin is applied and formed as an easy-adhesion primer, a sealer, a sealant, or an undercoat. These may be used in a single layer or a multilayer depending on the purpose.

[Use of Transfer Product] The use of a transfer product such as a decorative material obtained by using the uneven transfer sheet of the present invention is performed on an article having a transferred decorative surface having an uneven surface, particularly an uneven surface such as a three-dimensional shape. It can be used for various applications such as For example,
As a cosmetic material, exterior decoration such as exterior walls such as siding, fences, roofs, gates, gable boards, interior decoration of buildings such as walls, ceilings and floors, window frames, doors, handrails, thresholds, and door fittings such as Kamoi It can be used in various fields such as furniture such as cabinets, surface decoration of cabinets for light electric / OA equipment such as television receivers, and interior materials for vehicles such as automobiles, trains, aircraft, and ships. The decorative material is used as a decorative board or the like. In addition, the shape of the transfer product including the cosmetic material is arbitrary such as a flat plate, a curved plate, a rod-shaped body, and a three-dimensional object.

[Post-processing] The surface of a transferred product such as a cosmetic material after the transfer is further provided with a conventionally known overcoat such as a transparent protective layer in order to impart durability and design feeling as required. The layer may be formed by a coating method or the like.

[0043]

Next, the present invention will be further described with reference to Examples and Comparative Examples.

EXAMPLE An unevenness transfer sheet S using a three-layered support sheet as shown in FIG. 2 was prepared as follows. First, the support sheet 10 is made of a polypropylene layer 12.
Is the ratio of isotactic polypropylene (A) serving as a hard segment to atactic polypropylene (B) serving as a soft segment, and A: B is 80: 2.
Using a homopolypropylene consisting of a mixture of 0 weight ratio,
As the surface layer 11 and the back layer 13, the ethylene ratio is 3% by weight.
Using an ethylene-propylene random copolymer of
By a three-layer co-extrusion method using a die, a support sheet 10 having a total thickness of 80 μm was prepared in a three-layer configuration in which a surface layer of 8 μm, a polypropylene layer of 64 μm, and a back layer of 8 μm were laminated in this order.

Then, the surface layer 11 of the support sheet 10
(Note that no conaro discharge treatment was applied to the surface to give the transfer layer releasability.) The thermoplastic acrylic urethane resin was used as the binder resin as the pattern ink layer as the transfer layer. A three-color printing of a colored ink using quinacridone, isoindolinone, phthalocyanine blue and carbon black as a coloring agent, a pattern pattern layer of a stone pattern, a resin of the same binder, and a coloring ink using titanium white as a coloring agent Then, a white solid layer was formed by gravure printing in this order to obtain an uneven transfer sheet.

[Comparative Example 1] In the same manner as in the example, except that the support sheet 10 was changed to a single-layer 80 μm-thick sheet made of the ethylene-propylene random copolymer used for the surface layer in the example. Thus, an uneven transfer sheet was prepared.

[Comparative Example 2] In Example, the support sheet 10 was used as a polypropylene layer, and isotactic polypropylene (A) serving as a hard segment and atactic polypropylene (B) serving as a soft segment were used.
A sheet for uneven transfer was prepared in the same manner as in Example, except that the sheet was changed to a single layer of 80 μm in thickness of a homopolypropylene made of a mixture in which the ratio of A to B was 80:20 by weight.

[Evaluation of Performance] The conformability to irregularities was evaluated by transferring the material to a substrate having irregularities as follows. That is, as shown in the perspective view of FIG.
The transfer surface has a concave-convex shape having a linear groove-shaped concave portion, and the width Lw of the groove-shaped concave portion and its depth Ld are different from each other as shown in Table 1 (No. 6). 1 to N
The image was transferred to the substrate of o6) and evaluated. In addition, the inclination angles of the slopes were all set to 45 degrees.

In the curved surface transfer, the uneven transfer receiving base material is
A two-component curable urethane resin comprising 100 parts by weight of an acrylic polyol (glass transition temperature -20 ° C.) and 5 parts by weight of 1,6-hexamethylene diisocyanate, and a base coat layer of an acrylic emulsion-based enamel paint, and further thereon The adhesive layer was spray painted. And
The base coat layer and the adhesive layer of the uneven transfer receiving substrate are dried by heating (the two-component curable urethane resin of the adhesive layer is not completely cured), and the uneven transfer sheet is placed on the uneven transfer substrate. Then, the transfer layer is placed on the support sheet so that the transfer layer side faces the transfer target substrate side, and solid particles collide with the back surface side of the support sheet to give a collision pressure, thereby transferring the transfer sheet for transfer of protrusions and recesses. We tried to make contact with the substrate and follow the uneven surface. The solid particles had an average particle diameter of 0.1 preheated to 50 ° C.
A 4 mm spherical zinc sphere was used, and an ejector using an impeller as shown in FIGS. 4 to 6 was used as the ejector. The ejection speed of the solid particles was 35 [m / s]. Then, after the collision of the solid particles is completed, the sheet is cooled with cold air at 25 ° C., and the sheet for uneven transfer is adhered to the uneven transfer receiving substrate by heat fusion. Then, the support sheet is peeled off, and only the transfer layer is uneven. The transfer was made to the transfer-receiving substrate side to complete the transfer.

As shown in Table 1, as to the unevenness followability, as shown in Table 1, the Example and Comparative Example 2 were excellent. However, in Comparative Example 1 in which the ethylene-propylene copolymer used the support sheet of all layers, the results were poor. Table 1
In the middle, "○" indicates that the transfer layer was transferred to each part such as the inside of the groove.
“△” indicates that the transfer floating occurs at the groove angle, but slightly better,
“×” indicates that transfer floating occurred at the bottom of the groove, which was defective.

[0051]

[Table 1]

The stability of the peel strength over time was determined by leaving each concavo-convex transfer sheet in a constant temperature bath at 40 ° C. for 2 weeks.
A peeling test of 90 ° peeling as conceptually shown in FIG. The uneven transfer sheet S is adhered to a 3 mm-thick iron plate support base 31 with a double-sided adhesive tape (not shown) on the support sheet 10 side, and a 25 mm-wide cellophane adhesive tape 32 [Nichiban Co., Ltd.] is attached to the transfer layer 20 side. "Cellotape" (registered trademark) manufactured by the company] was applied, and the peeled end was pulled in a direction perpendicular to the surface of the support base 31 with a tensile tester, and the peel strength was measured.

As a result, the peel strength was 40 ° C. immediately after the production.
After standing for two weeks, the values shown in Table 2 were shown. That is, in Example and Comparative Example 1, after standing at 40 ° C. for 2 weeks, there was not much difference from immediately after production, and no particular change with time was observed. However, in Comparative Example 2 using the support sheet having the polypropylene layer facing the transfer layer side, the peel strength was significantly increased (about 3 times) after leaving at 40 ° C. for 2 weeks, and the transferability was significantly reduced. However, when the support sheet was peeled off, a part of the transfer layer was also peeled off together with the support sheet, resulting in transfer omission.

[0054]

[Table 2]

From the above results, it can be seen that only the unevenness transfer sheet of the example can achieve both the unevenness followability and the temporal stability of the peel strength. Further, in the example, no blocking occurred during winding and storage.

[0056]

According to the uneven transfer sheet of the present invention,
When used in a curved surface transfer method using solid particle collision pressure, it is possible to achieve both good followability of unevenness and stability over time of peel strength with a transfer layer. If the support sheet has a three-layer structure consisting of a surface layer, a polypropylene layer, and a back layer, each of which is made of a specific resin, curling can be prevented during production, storage, use, and the like.
In addition, the occurrence of blocking during winding and storage can be prevented.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing one embodiment of an unevenness transfer sheet of the present invention.

FIG. 2 is a cross-sectional view showing another embodiment of the uneven transfer sheet of the present invention.

FIG. 3 is a conceptual diagram of a curved surface transfer method using solid particle collision pressure.

FIG. 4 is a perspective view conceptually illustrating an example of an ejector using an impeller.

FIG. 5 is a conceptual diagram illustrating the inside of the impeller of FIG. 4;

FIG. 6 is an explanatory diagram for adjusting the ejection direction with an impeller.

FIG. 7 is a perspective view showing an uneven shape of an uneven transfer receiving base material used for evaluation of unevenness followability.

FIG. 8 is an explanatory view conceptually illustrating a method of measuring peel strength.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Support sheet 11 Surface layer 12 Polypropylene layer 13 Back layer 20 Transfer layer 31 Support base 32 Cellophane adhesive tape 812 Impeller 813 Blade 814 Side plate 815 Hollow part 816 Direction controller 817 Opening 818 Spreader 819 Rotation shaft 820 Bearing B group Material D Transfer product (decorative board etc.) Lw Frontage Ld Depth P Solid particles S Sheet for uneven transfer

Claims (2)

[Claims] An uneven transfer substrate, wherein a transfer layer side surface of an uneven transfer sheet in which a transfer layer is laminated on a support sheet of a polyolefin resin is opposed to the uneven transfer substrate, In the uneven transfer sheet used in the curved surface transfer method in which the solid particles collide with the support sheet side and use the collision pressure, the uneven transfer sheet is pressed and transferred by following the uneven transfer substrate by pressing and pressing. A support sheet, a polypropylene layer comprising a mixture of a hard segment of isotactic polypropylene and a soft segment of atactic polypropylene, and a surface layer comprising an ethylene-propylene random copolymer laminated on the transfer layer side of the polypropylene layer. And an uneven transfer sheet comprising at least two layers. 2. The support sheet is a support sheet comprising a surface layer, a polypropylene layer and a back layer, wherein a back layer comprising an ethylene-propylene random copolymer is further laminated on the back side of the polypropylene layer. The uneven transfer sheet according to claim 1.