JP7697335B2 - Decorative sheet set, decorative product, and method for manufacturing decorative product - Google Patents

Description

This disclosure relates to a decorative sheet set, a decorative product, a method for manufacturing a decorative product, and a decorative sheet.

There are various types of recording media that can be used for image formation, including recording media used in various image formation methods such as sublimation transfer, melt transfer, inkjet printing, and toner printing. Such recording media have an image layer that corresponds to the image formation method, and by forming an image on the image layer using various image formation methods, a printed product can be produced in which an image is formed on the image layer of the recording medium.

Attempts have also been made to use a printed matter produced using the above-mentioned recording medium as a decorative sheet, and to use this decorative sheet to decorate an article that is the object of decoration. For example, a printed matter produced by forming an image on an image layer is used as a decorative sheet, and a decorated product is produced by in-mold molding, insert molding, or the like. Patent Document 1 proposes a decorative sheet in which an image layer is provided on a resin sheet, and the image layer is an ink-cured image of an inkjet ink composition, and a method for producing a decorated product.

There is a demand for producing new decorative products with high design quality using decorative sheets.

JP 2013-43935 A

The objective of the present disclosure is to provide a method for manufacturing decorative items that can produce decorative items with a high level of design, a decorative sheet that can be used in the method for manufacturing decorative items, a decorative sheet set, and a decorative item with a high level of design.

A decorative sheet set according to one aspect of the present disclosure comprises a first decorative sheet having a first image formed on a first substrate by thermal transfer, and a second decorative sheet having a second image formed on a second substrate by thermal transfer, in which the light transmittance of the entire first decorative sheet in the wavelength region of 380 nm to 780 nm before the formation of the first image is 10% or more, and the light transmittance of at least a portion of the second decorative sheet in the wavelength region of 380 nm to 780 nm where the second image is formed is less than 10%.

A decorative product according to one aspect of the present disclosure includes a container having a bottom portion and a side wall portion rising from the outer periphery of the bottom portion, and a first decorative sheet and a second decorative sheet are integrated with the container at opposing positions on the outer periphery of the side wall portion, the first decorative sheet is a first base material on which a first image is formed by thermal transfer, the first decorative sheet has a light transmittance of 10% or more in the wavelength region of 380 nm to 780 nm inclusive of the entire first decorative sheet before the first image is formed, and is integrated with the container on the side on which the first image is formed, and the second decorative sheet is a second base material on which a second image is formed by thermal transfer, the light transmittance of the region on which the second image is formed is less than 10%, and is integrated with the container on the side on which the second image is formed.

A method for manufacturing a decorative product according to one aspect of the present disclosure includes a step of integrating the first decorative sheet of the decorative sheet set on the side where the first image is formed, at a predetermined position on the outer peripheral surface of a side wall of a container having a bottom surface and a side wall rising from the outer peripheral edge of the bottom surface, and a step of integrating the second decorative sheet on the side where the second image is formed, at a position on the side wall opposite the predetermined position.

A decorative sheet according to one aspect of the present disclosure is a decorative sheet for decorating a side wall of a container having a bottom and a side wall rising from the outer periphery of the bottom, the decorative sheet having a substrate, a first image formed on the substrate by a dye sublimation recording method, and a second image formed on the substrate by a melt transfer recording method, the first image being a left-right inverted image of an image to be combined with the second image, and the distance between the area where the first image is formed and the area where the second image is formed is half the outer periphery of the side wall.

This disclosure makes it possible to produce decorative items with a high level of design.

FIG. 2 is a cross-sectional view of an image receiving sheet according to an embodiment of the present disclosure. 2A and 2B are cross-sectional views of the decorative sheet. FIG. 3A is a perspective view of the decorative article, and FIG. 3B is a cross-sectional view of the decorative article. 4A and 4B are diagrams showing changes in the appearance of the decorative article. FIG. 2 is a cross-sectional view of a decorative sheet. 11A to 11C are diagrams illustrating a method for attaching a decorative sheet. FIG. 2 is a cross-sectional view of an intermediate transfer medium. 8A and 8B are cross-sectional views of the decorative sheet. FIG. FIG. 1 is a diagram showing an example of an object to be decorated. FIG. 2 is a cross-sectional view of a decorative sheet. FIG.

The following describes an embodiment of the present disclosure with reference to the drawings. Note that in the drawings, the width, thickness, shape, etc. of each part may be shown diagrammatically compared to the actual embodiment in order to make the description clearer, but these are merely examples and do not limit the interpretation of the present invention. In addition, for the sake of convenience, the terms "upper" and "lower" are used in the description, but the up-down direction may be reversed.

Figure 1 is a cross-sectional view of an image-receiving sheet S used to produce a decorative sheet according to an embodiment of the present disclosure. The image-receiving sheet S includes a substrate 1 and a receiving layer 2 provided on the substrate 1.

The substrate 1 includes a film substrate. Examples of the film substrate include polyesters such as polyethylene terephthalate and polyethylene naphthalate, polyolefins, polyvinyl chloride, polymethacrylate, polypropylene, polycarbonate, cellulose acetate, polyethylene derivatives, polyamide, polymethylpentene, and the like. These film substrates may be stretched or unstretched.

There is no limit to the thickness of the substrate 1, but it is, for example, about 1 μm or more and 300 μm or less.

The receiving layer 2 has a function of receiving sublimation dyes. Examples of materials that readily receive sublimation dyes include polyolefins such as polypropylene, halogenated resins such as polyvinyl chloride or polyvinylidene chloride, vinyl resins such as polyvinyl acetate, vinyl chloride-vinyl acetate copolymers, ethylene-vinyl acetate copolymers or polyacrylic esters, polyesters such as polyethylene terephthalate or polybutylene terephthalate, copolymers of olefins such as polystyrene, polyamide, ethylene or propylene with other vinyl polymers, cellulose resins such as ionomers or cellulose diastase, polycarbonates, epoxy resins, etc., with vinyl chloride resins, acrylic-styrene resins or polyesters being particularly preferred.

There is no limit to the thickness of the receiving layer 2, but it is, for example, about 0.1 μm or more and 10 μm or less.

The image receiving sheet S has a light transmittance in the visible light region of the entire sheet of 10% or more, preferably 30% or more, and more preferably 45% or more, and is transparent. Here, the visible light region refers to light in the wavelength region of 380 nm or more and 780 nm or less. In addition, transparency includes not only colorless transparency, but also translucency and colored transparency.

The light transmittance in the visible light region of the entire image-receiving sheet S means the light transmittance in the visible light region in the thickness direction of the laminate of all the components that make up the image-receiving sheet S, that is, the light transmittance in the visible light region in the thickness direction of the laminate of the substrate 1 and the receiving layer 2.

The light transmittance in the visible light region was measured using a spectrophotometer (UV-3100PC, Shimadzu Corporation) equipped with an integrating sphere attachment ISR-3100 (Shimadzu Corporation). Specifically, the light transmittance in the visible light region of the entire sheet was measured by placing the sheet to be measured on the sample light beam side of this device and measuring the light transmittance in the visible light region from 380 nm to 780 nm. For example, a light transmittance in the visible light region of the entire sheet of 10% or more means that all light transmittances in the visible light region are 10% or more.

As shown in FIG. 2A, an image G1 (first image) is formed on the receiving layer 2 by a sublimation transfer method to produce the first decorative sheet 10. The sublimation transfer method is an image formation method that uses a thermal transfer sheet provided with a color material layer containing a sublimation dye, applies thermal energy to the thermal transfer sheet according to image information, and transfers the sublimation dye contained in the color material layer to the receiving layer 2 to form an image. The sublimation dye is a yellow dye, a magenta dye, a cyan dye, a fluorescent dye, etc.

As shown in FIG. 2B, an image G2 (second image) is formed on the receiving layer 2 by a melt transfer method to produce the second decorative sheet 20. The melt transfer method is an image formation method in which a thermal transfer sheet provided with a color material layer containing melt ink is used, and thermal energy according to image information is applied to the thermal transfer sheet, and the color material layer melted or softened by the application of thermal energy is transferred layer by layer to the receiving layer 2 to form an image. The melt ink is a colorant such as a black pigment, metallic pigment, pearl pigment, or fluorescent pigment. Note that if image G2 is formed only by the melt transfer method, the receiving layer 2 of the second decorative sheet 20 may be omitted.

The area of the first decorative sheet 10 where the image G1 is formed has a lower light transmittance in the visible light region than the area where no image is formed, but the image G1 is transparent because it is an image formed with a sublimable dye. On the other hand, at least a part of the area of the second decorative sheet 20 where the image G2 is formed has a light transmittance in the visible light region of less than 10%, preferably 5% or less, and has concealing properties.

<Decorative items>
The decorative product according to this embodiment is an object to be decorated that is integrated with a first decorative sheet 10 and a second decorative sheet 20. The object to be decorated is a container B capable of containing a liquid or the like, as shown in Fig. 3A.

Container B has a bottom surface and a side wall portion rising from the outer periphery of the bottom surface, and is, for example, cylindrical or prismatic. The top of container B may be open, or may be provided with an openable and closable lid portion. Figure 3A shows an example of a bottle-shaped container B that tapers toward the top and has a lid portion at the top end.

As shown in Figures 3A and 3B, the first decorative sheet 10 and the second decorative sheet 20 are integrated with the outer peripheral surface of the container B so that their image forming surfaces face each other.

The side wall of container B has a transparency that allows the image G2 formed on the second decorative sheet 20 to be seen when the decorated product is viewed from the first decorative sheet 10 side while container B is empty. Transparency here includes not only colorless transparency, but also translucency and colored transparency. For example, the side wall of container B is a transparent body with a light transmittance of 10% or more in the visible light region (wavelength region of 380 nm to 780 nm). It is more preferable that container B has a light transmittance of 30% or more in the wavelength region of 380 nm to 780 nm, and it is particularly preferable that container B has a light transmittance of 45% or more in the wavelength region of 380 nm to 780 nm.

Materials for container B include polyethylene terephthalate, acrylic resin, polycarbonate, glass, etc.

When container B is filled with a substance with low transparency, such as milk tea, coffee, vegetable juice, etc., and the decorated product is viewed from the base material 1 side of the first decorative sheet 10, only image G1 is visible, as shown in FIG. 4A, and image G2 of the second decorative sheet 20 is not visible. By making image G1 formed on the receiving layer 2 of the first decorative sheet 10 an inverted image, it is possible to see the uninverted image when the decorated product is viewed from the base material 1 side.

The contents of container B preferably have a light transmittance of 50% or less in the wavelength region of 380 nm or more and 780 nm or less, and more preferably 30% or less. To improve the visibility of image G1, the contents of container B preferably have a light transmittance of 5% or more in the wavelength region of 380 nm or more and 780 nm or less. In addition, the color difference ΔE*ab between image G1 and the contents of container B is preferably 5 or more, and more preferably 10 or more.

When the decorated item is viewed from the first decorative sheet 10 side with the contents of container B gone, image G2 of the second decorative sheet 20 can be seen through the first decorative sheet 10 and container B. As shown in FIG. 4B, image G1 and image G2 overlap, and image G2 can be seen behind image G1, resulting in a decorated item with a novel design with a three-dimensional feel.

The area of the second decorative sheet 20 where image G2 is formed has a light transmittance in the visible light region of less than 10%, and when the decorated product is viewed from the first decorative sheet 10 side, the rear (deep) side of image G2 is difficult to see. This makes image G2 stand out.

One example of the image G1 formed on the first decorative sheet 10 and the image G2 formed on the second decorative sheet 20 is that which is superimposed and combined to form a new image. Specifically, the images are superimposed so that image G1 is on top and image G2 is on the bottom. Therefore, image G1 can be said to be the foreground image and image G2 the background image.

Image G1 formed on the first decorative sheet 10 is a foreground image that has been inverted (left and right). When image G1 is viewed from the substrate 1 side, it is a foreground image in a normal, uninverted state. Image G2 may be an inverted image instead of image G1.

In the above embodiment, the first decorative sheet 10 and the second decorative sheet 20 are separate bodies, but as shown in FIG. 5, images G1 and G2 may be formed at a distance from each other on a long strip-shaped image receiving sheet to form a single decorative sheet 30. The length of the decorative sheet 30 is approximately the same as the outer perimeter of the container B. The distance d between the images G1 and G2 is approximately half the outer perimeter of the side wall of the container B.

As shown in FIG. 6, the decorative sheet 30 is wrapped around the container B to integrate it with the container B on the receiving layer 2 side, producing a decorated product.

The method for integrating the decorative sheets 10, 20, 30 with the container B is not limited, and for example, an adhesive layer can be provided on the receiving layer 2. The adhesive layer used should be transparent so that the light transmittance of the decorative sheet having the adhesive layer in the visible light region is 10% or more.

The adhesive layer contains a component having adhesive properties. Examples of the adhesive component include acrylic resin, vinyl chloride-vinyl acetate copolymer, vinyl acetate resin, polyester, epoxy resin, polyimide, synthetic rubber, and the like. The adhesive layer may contain multiple components as the adhesive component. The adhesive layer may be an adhesive film or an adhesive sheet (double-sided adhesive sheet). The thickness of the adhesive layer is preferably 1 μm or more and 1000 μm or less.

The content of the adhesive component in the adhesive layer is preferably 50% by mass or more. The glass transition temperature (Tg) of this adhesive component is preferably less than 35°C, and more preferably less than 0°C. This can improve the adhesiveness. In this disclosure, Tg is a value determined by differential scanning calorimetry (DSC) in accordance with JIS-K-7121.

The adhesive layer refers to a layer that can bond and integrate the decorative sheets 10, 20, and 30 with the object to be decorated. The adhesive layer may have a single-layer structure consisting of only an adhesive layer, or may have a laminated structure in which adhesive layers are laminated. It may also have a laminated structure in which adhesive layers are provided on both sides of a film or the like.

The decorative sheets 10, 20, and 30 may be integrated with the container B using a vacuum forming machine.

As shown in FIG. 7, a decorative sheet may be produced using a so-called intermediate transfer medium in which a release layer 3 and a peeling layer 4 are provided between a substrate 1 and a receiving layer 2, in that order from the substrate 1 side. The intermediate transfer medium forms an image on the receiving layer 2, presses the intermediate transfer medium against the object to be transferred and heats it, and thermally transfers the transfer layer 5, which includes the peeling layer 4 and the receiving layer 2, to the object to be transferred, thereby forming an image on the object to be transferred.

The release layer 4 may be transparent so that the light transmittance of the transfer layer 5 in the visible light region is 10% or more. Examples of materials for the release layer 4 include cellulose derivatives such as ethyl cellulose, nitrocellulose, and cellulose acetate, acrylic resins such as polymethyl methacrylate, polyethyl methacrylate, and polybutyl acrylate, thermoplastic resins such as polyvinyl chloride, vinyl chloride-vinyl acetate copolymer, and vinyl copolymers such as polyvinyl butyral, thermosetting resins such as saturated or unsaturated polyester resins, polyurethane, thermocrosslinkable epoxy-amino resins, and aminoalkyd resins, silicone wax, silicone resins, silicone modified resins, fluororesins, fluoromodified resins, and polyvinyl alcohol.

The thickness of the peeling layer 4 is not particularly limited, and is, for example, about 0.1 μm or more and 5 μm or less.

The release layer 3 is provided between the substrate 1 and the peeling layer 4, and makes it easier to peel the transfer layer 5, including the receptive layer 2, from the substrate 1 when heated. Peeling occurs between the release layer 3 and the peeling layer 4 during thermal transfer.

The release layer 3 is made of materials with excellent release properties, such as waxes, silicone wax, silicone resins, fluororesins, etc., or resins with a relatively high softening point that do not melt due to the heat of the thermal head, or resins containing a thermal release agent such as wax in these resins. Examples of resins with a relatively high softening point include acrylic resins and polyurethanes.

As shown in FIG. 8A, an image G1 is formed on the receiving layer 2 by a sublimation transfer method to produce the decorative sheet 12. Also, as shown in FIG. 8B, an image G2 is formed on the receiving layer 2 by a melt transfer method to produce the decorative sheet 22.

The decorative sheets 12, 22 are placed on the outer peripheral surface of the container B, which is the object to be decorated, from the receiving layer 2 side, and heated from the substrate 1 side, so that the transfer layer 5 is transferred to the outer peripheral surface of the container B, as shown in FIG. 9.

An adhesive layer may be provided on the receiving layer 2, and the adhesive layer may be bonded to the outer peripheral surface of the container B, while the transfer layer 5 may be peeled off from the substrate 1 and transferred. The adhesive layer may be transferred in a pattern onto the receiving layer 2.

The release layer 3 may contain a filler to provide unevenness at the interface between the peeling layer 4 and the release layer 3. When the transfer layer 5 is transferred to the container B, the surface of the transfer layer 5 (peeling layer 4) becomes matte. The degree of matteness can be adjusted by the particle size and content of the filler.

The substrate 1 and release layer 3 may be integrated with the container B without being peeled off.

The container B to be decorated is not limited to a bottle, and may be one in which the contents move within the container, such as an hourglass T or an oil clock (liquid hourglass) shown in FIG. 10. For example, the first decorative sheet 10 and the second decorative sheet 20 are integrated on the outer peripheral surface of the first region of a container in which the contents move between the first and second regions. When there is content in the first region, only the image G1 of the first decorative sheet 10 is visible, and the image G2 of the second decorative sheet 20 is not visible. When the content is moved from the first region to the second region, the image G2 of the second decorative sheet 20 becomes visible behind the image G1 of the first decorative sheet 10.

As shown in FIG. 11, images G21 and G22 may be formed by overlapping them on the second decorative sheet 20A using a melt transfer method. The size of the lower image G21 (third image) is approximately the same as or slightly larger than the upper image G22 (second image).

When such a second decorative sheet 20A is integrated with a container B, as shown in FIG. 12, when the decorative item is viewed from the first decorative sheet 10 side with the container B emptied, the image G22 of the second decorative sheet 20 can be seen through the first decorative sheet 10 and the container B. On the other hand, when the decorative item is viewed from the second decorative sheet 20 side, the image G21 can be seen. The decorative item can have a different design depending on the direction from which it is viewed.

Images G21 and G22 may have different hues or patterns, so that when the decorative item is viewed from the first decorative sheet 10 side after container B is empty, a pattern or letters different from those in image G22 are visible.

In the above embodiment, an example was described in which the image G2 of the second decorative sheet 20 is formed by a melt transfer method, but it is sufficient if the light transmittance in the visible light region is less than 10%, and examples of methods that can be used include inkjet printing, toner printing, offset printing, gravure printing, flexographic printing, and screen printing.

Note that this disclosure is not limited to the above-described embodiment as it is, and in the implementation stage, the components can be modified and embodied without departing from the gist of the invention. In addition, various inventions can be formed by appropriately combining multiple components disclosed in the above-described embodiment. For example, some components may be deleted from all the components shown in the embodiment. Furthermore, components from different embodiments may be appropriately combined.

REFERENCE SIGNS LIST 1 Substrate 2 Receptive layer 3 Release layer 4 Peel layer 5 Transfer layer 10 First decorative sheet 20 Second decorative sheet 30 Decorative sheet

Claims (5)

a first decorative sheet having a first image formed by thermal transfer on a first substrate;
a second decorative sheet having a second image formed by thermal transfer on a second substrate;
Equipped with
the first decorative sheet as a whole has a light transmittance of 10% or more in a wavelength range of 380 nm or more and 780 nm or less before the first image is formed;
a light transmittance in a wavelength range of 380 nm or more and 780 nm or less in at least a portion of the second decorative sheet where the second image is formed is less than 10%,
the first image is an image formed by a dye sublimation recording method, and the second image is an image formed by a melt transfer recording method,
A decorative sheet set , wherein a third image is formed on the second base material by a melt transfer recording method, and the second image is formed on the third image . The decorative sheet set according to claim 1, wherein the first image and the second image are combined images, and the first image or the second image is formed inverted on the first decorative sheet or the second decorative sheet. A container having a bottom surface and a side wall portion rising from an outer periphery of the bottom surface,
a first decorative sheet and a second decorative sheet are integrated with the container at opposing positions on an outer circumferential surface of the side wall portion;
the first decorative sheet is a first base material having a first image formed thereon by thermal transfer, the first decorative sheet as a whole has a light transmittance of 10% or more in a wavelength region of 380 nm or more and 780 nm or less before the first image is formed, and is integrated with the container on the side of the surface on which the first image is formed;
The second decorative sheet is a decorative product in which a second image is formed by thermal transfer on a second substrate, the light transmittance in the wavelength range of 380 nm or more and 780 nm or less in the area in which the second image is formed is less than 10%, and the second decorative sheet is integrated with the container on the side on which the second image is formed. The decorative article according to claim 3 , wherein the side wall portion has a light transmittance of 10% or more in a wavelength range of 380 nm to 780 nm. a step of integrating the first decorative sheet of the decorative sheet set according to claim 1 or 2 on the side on which the first image is formed, to a predetermined position on an outer peripheral surface of a side wall portion of a container having a bottom surface and a side wall portion rising from an outer peripheral edge of the bottom surface;
a step of integrating the second decorative sheet on the second image forming surface side to a position opposite the predetermined position of the side wall portion;
A method for manufacturing a decorative product comprising the steps of:

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