JP7512715B2 - Transfer sheet and decorative sheet using same - Google Patents

Description

The present invention relates to a transfer sheet that forms a pattern or the like on the surface of a decorative sheet used for flooring materials, etc., and more specifically to a transfer sheet that uses an inhibiting ink that partially inhibits foaming in the material to be transferred and has a moisture-proof protective layer that prevents moisture absorption in the foam-inhibiting ink area, and a decorative sheet using the same.

Transfer paper with suppressed ink specifications is known in the past (see Patent Documents 1 and 2).

JP 2005-22373 A JP 2015-193249 A Japanese Patent Application Laid-Open No. 11-267407

However, conventional transfer paper using suppressive ink had the problem that the suppression effect was weakened in the high temperature and humidity environments of summer.
This is because the suppressor contained in the suppressor ink reacts with water molecules (see Patent Document 3).

The present invention focuses on the above points and aims to provide a transfer sheet and a decorative sheet using the same that can provide stable effects even when stored for a long period of time by providing a moisture-proof protective layer that prevents moisture absorption by the inhibiting ink in a protective area that covers at least the area where the foam-inhibiting ink part is provided.

On the other hand, printing defects in the expansion-inhibiting ink area are confirmed by utilizing the difference in gloss between the design ink and the inhibiting ink.
In contrast, when the moisture-proof protective layer according to the present invention is provided on the front or back surface of a picture pattern layer containing an expansion-inhibiting ink portion, the gloss of the moisture-proof protective layer and the inhibitory ink will become similar, or the gloss of the moisture-proof protective layer and the base sheet will become similar, which is expected to make it difficult to check for printing defects in the expansion-inhibiting ink portion.
Secondly, the present invention focuses on the above-mentioned points and aims to provide a gloss difference different from that of the inhibitor ink by varying the amount of protective ink applied to form the moisture-proof protective layer or by incorporating a predetermined amount of a matte additive in the protective ink, thereby making it easier to check for printing defects in the foam-inhibiting ink area.

A transfer sheet according to one embodiment of the present invention is a transfer sheet having a peelable pattern layer including an expansion-inhibiting ink portion that inhibits expansion of a material to be transferred onto the surface of a base sheet, and is characterized in that a moisture-proof protective layer is provided in a protective area that covers at least the area in which the expansion-inhibiting ink portion is provided, for preventing moisture absorption into the expansion-inhibiting ink portion.
In addition, the transfer sheet according to one aspect of the present invention is characterized in that a protective ink is solid-printed in the protective area as the moisture-proof protective layer.

The transfer sheet according to one aspect of the present invention is characterized in that the coating amount of the protective ink is 1 g/ ^m2 or more and 20 g/ ^m2 or less.
A transfer sheet according to one aspect of the present invention is characterized in that the protective ink contains a matte additive.
The transfer sheet according to one aspect of the present invention is characterized in that the amount of the matte additive added is 3% by mass or more and 30% by mass or less.
The transfer sheet according to one aspect of the present invention is characterized in that the moisture-proof protective layer is provided on the surface of the picture pattern layer.

The decorative sheet according to one aspect of the present invention has a foamable resin layer on a support, and at least a picture pattern layer including an expansion-inhibiting ink portion that inhibits foaming in the foamable resin layer is provided on the foamable resin layer. The expansion-inhibiting ink portion inhibits foaming of the foamable resin layer, forming a relatively low recess in the area where the expansion-inhibiting ink portion is not provided. The decorative sheet is characterized in that a moisture-proof protective layer is provided between the foamable resin layer and the expansion-inhibiting ink portion to prevent moisture absorption by the expansion-inhibiting ink portion.

According to one aspect of the present invention, it is possible to provide a transfer sheet that can exhibit stable effects even when stored for a long period of time, and a decorative sheet using the same.

FIG. 2 is a cross-sectional view of a transfer sheet according to the first embodiment. FIG. 11 is a cross-sectional view of a transfer sheet according to a second embodiment.

(Transfer sheet 10 according to the embodiment)
In Figure 1, 10 is a transfer sheet 10 relating to embodiment 1, which is used to form a pattern or the like on the surface of a transfer target material, which is a floor material (decorative material) for use in wet areas such as kitchens, washrooms, and toilets (not shown).
The transfer sheet 10 is formed from the following layers.
The following items (1) to (3) will be described later.
(1) Base sheet 20 (release paper)
(2) Picture pattern layer 30
(3) Moisture-proof protective layer 40

(Base sheet 20)
The base sheet 20 is, for example, a release paper.
The base sheet 20 may be made of, in addition to "paper", an olefin resin, a polyester resin, a laminate of paper and an olefin resin, or a laminate of paper and a polyester resin sheet.
As the base sheet 20 according to this embodiment, a laminate in which paper and an olefin-based resin are laminated can be suitably used.

As the olefin resin, for example, one or a mixture of two or more types of various resins such as polypropylene resin, low density polyethylene resin, high density polyethylene resin, polymethylpentene resin, etc. can be used as a single layer or a laminated structure in which multiple layers are combined.
To explain this with reference to the embodiment described later, the base sheet 20 is made of paper laminated with polypropylene resin on both sides.
The print surface, which is the front surface of the base sheet 20, is glossy finished, but a matte finish may also be used.
Although the back surface of the base sheet 20 used has a matte finish, it may have a gloss finish.

(Picture Pattern Layer 30)
As shown in FIG. 1, the picture design layer 30 is provided on the printing surface, which is the front surface of the base sheet 20, and contains an inhibiting ink that inhibits foaming in the transfer material.
As shown in Fig. 1, the picture pattern layer 30 is formed from multiple layers, for example, three layers, by laminating the first color (suppression), the second color, and the third color in this order from the base sheet 20 side. The reason for dividing into multiple layers, for example, three layers, is to print the printing inks by color, and the first color uses a suppression ink. Although the picture pattern layer 30 is formed from multiple layers, the present invention is not limited to this, and it may be a single layer, or may be two layers or four or more layers.
As shown in FIG. 1, each color pattern layer 30 is formed from the following layers.
(1) Picture Ink Section 31
The picture ink section 31 is made up of color inks.
(2) Foam-inhibiting ink section 32
The expansion inhibiting ink section 32 is formed between adjacent pattern ink sections 31 and is made of an inhibiting ink.

(Restrained inks and colored inks)
The inhibiting ink may contain any conventionally known foaming inhibitor, such as triazine compounds, triazole compounds such as benzotriazoles and aminotriazoles, trimellitic anhydride, maleic acid, fumaric acid, adipic acid, etc., and among these, triazole compounds are preferably used.
More preferably, the compound is an aminotriazole.

The foam-inhibiting ink section 32 containing the inhibiting ink can be used as a binder resin by appropriately selecting from resins such as vinyl resins such as vinyl chloride-vinyl acetate copolymers, acrylic resins, polyester resins, and urethane resins, either alone or as a composite such as a mixture or copolymer.
Furthermore, the expansion-inhibiting ink portion 32 may contain an extender pigment for reducing tackiness, various stabilizers, and the like. As the extender pigment, for example, silica can be suitably used.

The picture pattern layer 30 can be provided with any pattern, such as a decorative pattern for decorating the surfaces of buildings such as houses and stores, interior and exterior materials for vehicles such as trains and automobiles, airplanes and ships, flooring, etc., designs, colors, wood grain patterns, cork patterns, stone patterns, tile patterns, joints, wood grain duct patterns, etc.
Such a picture pattern layer 30 can use any color ink that is conventionally known, and examples of color ink pigments include, but are not limited to, isoindolinone yellow, polyazo red, phthalocyanine blue, carbon black, iron oxide, and titanium oxide.

In addition, as the binder resin used in the color ink, various resins such as urethane resins, acrylic resins, polyester resins, vinyl resins, etc. can be appropriately selected and used alone or as a composite such as a mixture or copolymer.
Furthermore, there is no problem if various additives such as hardeners, catalysts, stabilizers, initiators, etc. are added to the picture design layer 30 according to the selected binder resin.
The expansion-inhibiting ink portion 32 and the picture pattern layer 30 as described above can be provided by appropriately selecting a conventionally known printing technique such as gravure printing, offset printing, gravure offset printing, screen printing, flexographic printing, inkjet printing, or the like.

(Moisture-proof protective layer 40)
As shown in FIG. 1, the moisture-proof protective layer 40 is provided in a protective region of the picture pattern layer 30 that covers at least the region in which the expansion-inhibiting ink portion 32 is provided, in order to prevent moisture absorption into the expansion-inhibiting ink portion 32.
Specifically, the moisture-proof protective layer 40 is provided on the surface of the picture pattern layer 30. The moisture-proof protective layer 40 is not limited to the surface of the picture pattern layer 30, and may be provided between the base sheet 20 and the picture pattern layer 30, as will be described later with reference to FIG.
The moisture-proof protective layer 40 is formed by printing, preferably solidly printing, a protective ink so as to cover the expansion-inhibiting ink portion 32 .

(Protective ink)
The protective ink may be, for example, a colored ink, or may be an acrylic-vinyl chloride-vinyl acetate-based ink similar to that of the picture pattern layer 30. In addition, the protective ink is not limited to colored ink, and may be a resin-type ink or paint containing a thermosetting resin, an acrylic resin, a urethane resin, or the like as a main component.
The moisture-proof protective layer 40 is preferably a "solid print", but it is sufficient that it is formed on the expansion-inhibiting ink portion 32, and it may be simply "printed", or it may be printed so that the surface of the expansion-inhibiting ink portion 32 is coated with a resin-type ink or the like, or it may be painted.

(Printing method)
For example, gravure printing is used for the "solid printing", but the printing method is not limited to this and other printing methods such as flexographic printing, offset printing, and inkjet printing may also be used.
(Amount of protective ink applied)
The amount of protective ink applied is preferably 1 g/ ^m2 or more and 20 g/ ^m2 or less.
The amount of protective ink applied affects the glossiness of the moisture-proof protective layer 40 .
This is because printing defects in the expansion-inhibiting ink portion 32 are confirmed using gloss difference.

The gloss level of the moisture-proof protective layer is desirably lowest on the right side and gradually increases toward the left side as follows, and it is necessary that there is a predetermined distance between each section and layer or between each layer so that they can be distinguished by their gloss levels.
Foaming-inhibiting ink portion 32 < moisture-proof protective layer 40 < picture pattern layer 30 (substrate sheet 20)
Since the difference in gloss was clearly visible in all coating amounts of 1 to 20 g/ ^m2 , it was relatively easy to check for printing defects in the expansion-inhibiting ink portion 32.
When the coating amount was less than 0.5 g/ ^m2 , the gloss was the same as that of the base paper alone, making it difficult to check for printing defects.
At an application amount of 30 g/ ^m2 , peeling occurred due to ink adhesion to the printed surface during winding, making it impossible to evaluate and making it impossible to detect printing defects.
The gloss level is a measure of the degree of reflection when light is applied to the surface of an object.

(Containing matte additive)
The protective ink contains a matte additive such as silica to prevent printing problems such as printing defects caused by gloss differences.
The amount of the matte additive added is preferably 3% by mass or more and 30% by mass or less.
When the amount of the matte additive added was less than 1% by mass, the amount added was too small, and no difference in gloss was observed compared to when no additive was added.

When the amount of the matte additive added was 3 to 30% by mass, the expansion-inhibiting ink portion 32 and the moisture-proof protective layer 40 had different gloss differences, so that it was relatively easy to check for printing defects in the expansion-inhibiting ink portion 32.
When the amount of the matte additive added was 50 mass % or more, the gloss of the moisture-proof protective layer 40 became lower than the gloss of the expansion-inhibiting ink portion 32, so that printing voids in the expansion-inhibiting ink portion 32 could not be confirmed or detected.

(Solid printing)
An area that is filled in with a color that has an ink concentration of 100% or a combination of two 100% colors is called a "solid" area, and "solid printing" refers to printing in the colors described above, in which the print is completely covered with the protective ink, with no gaps.
The protective inks are composed of the four colors of CMYK or DIC (special colors) mixed to express specific colors, but the following colors are considered solid colors.
(1) C100% color (100% of CMYK monochrome)
(2) C100% + M100% color (a combination of 100% CMYK)
(3) 100% DIC color (100% special ink)
(4) CMYK all combined at 100% (total solid)

(decorative sheet)
The decorative sheet is a material to which the image is transferred.
Although not shown, the decorative sheet has a foamable resin layer on a support.
By transferring the picture pattern layer 30 of the transfer sheet 10 shown in FIG. 1 onto the foamable resin layer, at least the picture pattern layer 30 including the expansion-inhibiting ink portion 32 that inhibits foaming in the foamable resin layer is provided.
In the decorative sheet, the expansion of the foamable resin layer is suppressed by the area where the expansion-inhibiting ink section 32 of the transfer sheet 10 is provided, thereby forming a recess that is relatively lower than the area where the expansion-inhibiting ink section 32 is not provided.

(Effects of the First Embodiment)
According to the transfer sheet 10 of one embodiment of the present invention, the moisture-proof protective layer 40 can be provided relatively simply and inexpensively by solid printing of protective ink in the protective area, and the moisture-proof protective layer 40 can prevent moisture absorption into the foaming-inhibiting ink portion 32.
According to the transfer sheet 10 of one embodiment of the present invention, by applying the protective ink in an amount of 1 g/ ^m2 or more and 20 g/ ^m2 or less, it is relatively easy to check for printing defects in the expansion-inhibiting ink portion 32.

According to the transfer sheet 10 of one embodiment of the present invention, by including a matting additive in the protective ink, it is relatively easy to check for printing defects in the expansion-inhibiting ink portion 32 .
In the transfer sheet 10 according to one embodiment of the present invention, by setting the amount of the matte additive to be 3% by mass or more and 30% by mass or less, it becomes even easier to check for printing defects in the expansion-inhibiting ink portion 32 .
According to the transfer sheet 10 of one aspect of the present invention, the moisture-proof protective layer 40 is provided on the surface of the picture pattern layer, so that moisture absorption into the expansion-inhibiting ink portion 32 from the surface side can be prevented.
According to the decorative sheet according to one aspect of the present invention, it is possible to prevent moisture absorption into the expansion-inhibiting ink portion 32 of the transfer sheet 10 used therein.

(Embodiment 2 shown in FIG. 2)
Next, a second embodiment will be described with reference to FIG.
The second embodiment is characterized in that a moisture-proof protective layer 40 is disposed between a plurality of picture pattern layers 30, as shown in FIG.
That is, as shown in FIG. 2, the picture design layer 30 is formed of a plurality of layers, for example three layers, by laminating a first color (suppression), a second color, and a third color in this order from the base sheet 20 side.
The moisture-proof protective layer 40 is provided between the first and second colors. Although the moisture-proof protective layer 40 is provided between the first and second colors, the present invention is not limited to this and may be provided between the second and third colors. Furthermore, the picture pattern layer 30 is formed of three layers, but the present invention is not limited to this and may be formed of two layers or four or more layers and provided between them. The moisture-proof protective layer 40 does not cause any problems in production even if it is printed in this manner.
In one embodiment of the transfer sheet 10 of the present invention, a moisture-proof protective layer 40 is provided between the base sheet 20 and the picture pattern layer 30, thereby preventing moisture absorption into the expansion-inhibiting ink portion 32 from the base sheet 20 side.

Below, we will explain Examples A to D of the transfer sheet according to the present invention, as well as Comparative Examples A to G. Note that the present invention is not limited to the following Examples A to D.

Example A
The transfer sheet of Example A was prepared using the following materials and procedures.
Polypropylene laminated paper is used as the base sheet (raw material), and a pattern is printed on the PP surface by gravure printing.
The pattern layer is created by pattern printing. The layer structure from the PP surface is (1) foam-inhibiting ink part, and (2) pattern ink part.
On the design layer, the same acrylic vinyl chloride acetate ink or color ink was printed in a solid layer as the moisture-proof protective layer.
The standard number of lines of the solid plate used for solid printing is 175 lines, and the target dry coating amount is 1 g/m ^2. The number of parts of the matte additive was 5% by mass (hereinafter, simply referred to as "parts").
The coating amount of the moisture-proof protective layer was 1 g/m ² .

Example B
In Example B, the coating amount of the moisture-proof protective layer was 20 g/m ² , and the rest was the same as Example A.
Example C
In Example C, the moisture-proof protective layer was prepared with a matte additive of 3 parts, 1 g/m ² , and the rest was the same as Example A.
Example D
In Example D, the moisture-proof protective layer was prepared with a matte additive amount of 30 parts, that is, 1 g/m ² , and the rest was the same as Example A.

Comparative Example A
Comparative Example A was prepared without providing a moisture-proof protective layer (0 g/m ² ), and was otherwise the same as Example A.
(Comparative Example B)
In Comparative Example B, the moisture-proof protective layer was prepared at 30 g/ ^m2 , and the rest was the same as Example A.

Comparative Example C
In Comparative Example C, the moisture-proof protective layer was prepared at 0.5 g/ ^m2 , and the rest was the same as Example A.
(Comparative Example D)
In Comparative Example D, the moisture-proof protective layer was prepared with a matte developer of 1 g/m ² , and the rest was the same as Example A.

(Comparative Example E)
In Comparative Example E, the moisture-proof protective layer was prepared with 50 parts of matte additive, that is, 1 g/m ² , and otherwise the same as Example A.
(Comparative Example F)
In Comparative Example F, the moisture-proof protective layer was prepared with 2 parts of matte additive at 1 g/ ^m2 , otherwise the same as Example A.
(Comparative Example G)
In Comparative Example G, the moisture-proof protective layer was prepared with 40 parts of matte additive, that is, 1 g/m ² , and the rest was the same as Example A.

(Evaluation Method and Criteria)
The evaluation method is as follows.
(1) We confirmed whether the defect inspection machine could detect defects such as ink loss during printing.
(2) The transfer paper having the suppression ink specifications described in the Examples and Comparative Examples was stored in an environment of 40° C. and 90% humidity, and samples were taken out after a certain period of time.
The sample taken out is thermally transferred to a PVC foam layer using a transfer machine (I).
Thereafter, the substrate sheet (base paper, release paper) was peeled off, and the sol coat was uniformly applied onto (I).

The evaluation sheet was foamed in an oven at 220° C. for 2 minutes and evaluated in the following manner.
(1) Verification of Inhibitory Effect The verification of the inhibitory effect was evaluated by evaluating the feel of the material by hand and by a sensory test. The evaluation was performed by 10 testers.
The evaluation criteria were as follows: 0 people: ×, 1-6 people: △, 7-9 people: ○, 10 people: ◎.
The accelerated test at 40° C. and 90% humidity corresponds to the state after two weeks of storage at room temperature.

(2) Whether or not printing defects can be detected Regarding whether or not printing defects can be detected, if they can be detected by a "defect inspection machine," they are rated as "Yes," and if they cannot be detected, they are rated as "No."
(3) Final pass/fail The final pass/fail was determined by comprehensively judging (1) the suppression effect verification (evaluation of the feel of the hand) and (2) whether or not the printing defects could be detected, and a "pass" or "fail" was determined. If (1) the suppression effect verification (evaluation of the feel of the hand) was "passed" after 12 weeks had elapsed, and (2) whether or not the printing defects could be detected was "allowed," the test was deemed to have been "passed," and if not, the test was deemed to have been "failed."

(Evaluation results)
The evaluation results of the wallpaper are as shown in Table 1 below.

(Examples A to D and Comparative Examples A to G)
Of the 11 evaluation sheets in total for Examples A to D and Comparative Examples A to G, only four evaluation sheets in total for Examples A to D were rated "pass."
The remaining seven evaluation sheets of Comparative Examples A to G were all "failed."

In addition, Comparative Example B was deemed "unacceptable" and "failed" due to problems with production stability. That is, at a coating amount of 30 g/ ^m2 , peeling occurred due to ink adhesion with the printed surface during winding, so it could not be evaluated.
Of Comparative Examples A to G, Comparative Example A did not have a moisture-proof protective layer, and therefore the suppression effect verification (hand feel evaluation) was "failed" after 12 weeks. Comparative Example B was "unevaluable" and "failed." Comparative Example C had a coating amount of the moisture-proof protective layer of "0.5 g/m ² ", which is presumably too little. Comparative Example D had a matte developer part of "1 part," which is presumably too little. Comparative Example E had a matte developer part of "50 parts," which is presumably too much. Comparative Example E had a matte developer part of "2 parts," which is presumably too little. Comparative Example E had a matte developer part of "40 parts," which is presumably too much.

On the other hand, it can be estimated that the coating amount of the moisture-proof protective layer is "1 g/m ² " in Example A as the lower limit and "20 g/m ² " in Example B as the upper limit.
The number of parts of the matte developer relative to the moisture-proof protective layer is estimated to be "3 parts" in Example C at the lower limit and "30 parts" in Example D at the upper limit. As a result, the amount of the matte additive added is preferably 3% by mass or more and 30% by mass or less.

REFERENCE SIGNS LIST 10 Transfer sheet 20 Base sheet 30 Picture pattern layer 31 Picture ink section 32 Foam-inhibiting ink section 40 Moisture-proof protective layer

Claims (11)

A transfer sheet having a pattern layer including an expansion-inhibiting ink portion for inhibiting expansion of a transfer material on the surface of a base sheet, the pattern layer being peelably provided on the surface of the base sheet,
a moisture-proof protective layer for preventing moisture absorption into the expansion-inhibiting ink portion is provided in a protective region that covers at least the region in which the expansion-inhibiting ink portion is provided ;
A transfer sheet, characterized in that the expansion-inhibiting ink portion and the moisture-proof protective layer are in contact with each other . 2. The transfer sheet according to claim 1, wherein the moisture-proof protective layer is a solid print layer formed by applying a protective ink to the protective area. 3. The transfer sheet according to claim 2, wherein the amount of the protective ink applied is 1 g/m ^<2> or more and 20 g/m ^<2> or less. The transfer sheet according to claim 2 or 3, characterized in that the protective ink contains a matte additive. The transfer sheet according to claim 4, characterized in that the amount of the matte additive added is 3% by mass or more and 30% by mass or less. The transfer sheet according to any one of claims 1 to 5, characterized in that the moisture-proof protective layer is provided on the surface of the picture pattern layer. The design layer is a laminate composed of a plurality of layers,
6. The transfer sheet according to claim 1, wherein the moisture-proof protective layer is provided between layers constituting the picture pattern layer. 8. The transfer sheet according to claim 1, wherein the moisture-proof protective layer is provided in a protective area that covers only the area where the expansion-inhibiting ink portion is provided. The foaming film has a foamable resin layer on a support, and at least a picture pattern layer including an expansion-inhibiting ink portion that inhibits foaming in the foamable resin layer is provided on the foamable resin layer,
A decorative sheet in which the expansion-inhibiting ink portion is provided in an area to inhibit the expansion of the expandable resin layer, thereby forming a recess that is relatively lower than a region in which the expansion-inhibiting ink portion is not provided,
a moisture-proof protective layer is provided between the expandable resin layer and the expansion-inhibiting ink portion to prevent moisture absorption into the expansion-inhibiting ink portion ;
A decorative sheet, characterized in that the expansion-inhibiting ink portion and the moisture-proof protective layer are in contact with each other . The design layer is a laminate composed of a plurality of layers,
10. The decorative sheet according to claim 9, wherein the moisture-proof protective layer is provided between layers constituting the picture design layer. 11. The decorative sheet according to claim 9, wherein the moisture-proof protective layer is provided only in an area where the expansion-inhibiting ink portion is provided.

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