JP2000108237A - Printing sheet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a printing sheet wherein chemical resistance and smoothness are improved. SOLUTION: An under layer 3 composed of an adhesive is provided on one or both faces of a base 2, and a top layer 4 composed of a single substance or a mixture of urethane resin or polyester resin is provided on the under layer 3. The top layer 4 is applied not by direct coating, but by forming beforehand a film composed of a single substance or a mixture of urethane resin or polyester resin and adhering the film to the under layer 3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a printing sheet, and more particularly, to a linen label, a process control label and an indoor /
The present invention relates to a printing sheet that can be suitably used as an outdoor printing material.

[0002]

2. Description of the Related Art Conventionally, label materials using paper or film have been mainly used, but such label materials have resistance to washing and chemical resistance (particularly to hydrogen peroxide and sodium hypochlorite). And the water resistance is low, and there is a drawback that the sewing machine cannot be sewn because it is easily broken or scratched. Washing resistance is a problem because clothes to which the label material is attached are washed many times, and water resistance is a problem particularly in outdoor printing materials.

[0003] Label materials using woven fabrics are also known. For example, Japanese Utility Model Publication No. 2-47009 discloses a structure in which a wet nylon layer is provided on a base cloth made of a woven fabric, and Japanese Patent Application Laid-Open No. 4-265987 discloses a method of applying a water-soluble polyester resin paint to a polyester substrate. Alternatively, a printing label obtained by applying a wet nylon resin paint to the surface after impregnation is disclosed.
No. 52836 discloses a label material in which a polyurethane resin porous layer is provided on a base material such as a woven fabric.

[0004] However, these label materials have low chemical resistance. Those using a wet nylon resin are particularly low in chemical resistance, and those using the polyurethane resin are a wet urethane film and have a porous structure, although not as much as those using a wet nylon resin. Chemical resistance is still low. For example, label materials are attached to sheets used in hospitals, uniforms used in nurses' white coats and convenience stores, and the sheets are bleached with bleaching agents such as hydrogen peroxide and sodium hypochlorite. However, the chemical resistance to these chemicals is particularly problematic because the film swells and dissolves or falls off.

The smoothness of the material described in the above publication is low because the material is applied by a direct coating method such as a doctor method or a mangle method. This is an obstacle to providing good printability.

[0006]

SUMMARY OF THE INVENTION An object of the present invention is to provide a printing sheet which has improved chemical resistance and smoothness, and can be suitably used as a label.

[0007]

Means for Solving the Problems The present invention provides (A) a substrate,
A printing method comprising: an under layer made of an adhesive provided on one or both surfaces of the base material; and a top layer made of a urethane resin or a polyester resin alone or a mixture provided on the under layer. Provide a sheet for use.

[0008] In another aspect, the present invention provides
(B) The printing sheet according to (A), wherein the base material is a woven fabric made of a natural fiber or a synthetic fiber alone or a woven or blended fiber, or a nonwoven fabric made of a natural fiber or a synthetic fiber.

[0009] In another aspect, the present invention provides
(C) The printing sheet according to (A) or (B), wherein the urethane resin is a polyester-based, polyether-based, or polycarbonate-based product alone or as a mixture.

[0010] In another aspect, the present invention provides
(D) 100% modulus is 10 to 90 kg / cm
^2. The printing sheet according to (A) or (B), wherein the top layer is formed of a urethane resin having a softening point of 100 to 180 ° C.

In still another embodiment, the present invention relates to (A) wherein (A) the top layer is formed of a polyester resin having a Shore rebound hardness of 20 to 80 and a softening point of 100 to 170 ° C. Alternatively, the printing sheet according to (B) is provided.

In still another embodiment, the present invention provides the above (A) to (E), wherein the thickness of the (E) top layer is 3 to 30 μm and the surface smoothness is 500 seconds or more.
A printing sheet according to any one of the first to third aspects is provided.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A printing sheet according to the present invention will be described below with reference to the drawings. As shown in FIG. 1, the printing sheet (1) of the present invention comprises a substrate (2), an under layer (3) provided on the substrate, and a top layer (3) provided on the under layer. 4). The under layer (3) and the top layer (4) can be provided on one side or both sides of the substrate, but FIG. 1 shows an example in which they are provided on one side. FIG. 2 is a cross-sectional view of the printing sheet of the present invention showing the warp yarn (5) and the weft yarn (6) of the base fabric.

First, as the base material (2), a woven fabric made of natural fibers or synthetic fibers alone or mixed or blended, or a nonwoven fabric made of natural fibers or synthetic fibers is used. From the viewpoint of chemical resistance, a woven or nonwoven fabric made of synthetic fibers is preferably used. Examples of natural fibers include cotton fibers and hemp fibers. Examples of the synthetic fibers include polyester fibers and nylon fibers. Examples of the nonwoven fabric include a polyester nonwoven fabric and a cotton nonwoven fabric. The thickness of the substrate is generally 10 to 500 µ, preferably 80 to 150 µ.

An under layer (3) is provided on the substrate (2), and the under layer is made of an adhesive. Examples of the adhesive include urethane resin-based and polyester resin-based adhesives. The thickness of the under layer is usually 1 to 20 µ, preferably 2 to 5 µ.

A top layer (4) is further provided on the under layer (3). The thickness of the top layer is usually 3 to 30μ,
Preferably it is 5-10 micrometer.

The top layer is made of a urethane resin or a polyester resin alone or as a mixture. The urethane resin may be any of polyester, polyether, and polycarbonate. One example is a one-component polyester-based polyurethane resin. The 100% modulus of the urethane resin used is usually 1
0 to 90 kg / cm ² , preferably 30 to 70 k
g / cm ² . 100% modulus is 10k
If it is less than g / cm ² , blocking is a problem, while if it exceeds 90 kg / cm ² , the hand becomes hard and becomes a problem. The urethane resin used has a softening point of 1
It is in the range of 00 to 180 ° C, preferably 130 to 150 ° C. If the softening point is less than 100 ° C., washing resistance is a problem, and if it exceeds 180 ° C., there is a problem in printability.
Here, in this specification, the softening point refers to a temperature at which the material is deformed by its own weight, as measured by a trace melting point measuring device.

Next, examples of the polyester resin used in the top layer include a linear saturated polyester resin. That is, as the dicarboxylic acid component, terephthalic acid, isophthalic acid, aromatic dicarboxylic acids such as phthalic acid,
Aliphatic dicarboxylic acids such as adipic acid, succinic acid, sebacic acid and dodecanedioic acid, as diol components, ethylene glycol, propylene glycol, 1,4-butanediol, 1,6-hexanediol, neopentyl glycol, etc. It contains cyclohexane dimethanol bisphenol or the like as a component. The polyester resin having a Shore rebound hardness of 20 to 80 is used. When the Shore rebound hardness is less than 20, blocking is a problem, and when it is more than 80, the texture is hard. Here, the Shore rebound hardness means that a hammer (with a weight of about 3 g) with a spherical diamond attached to the tip is dropped freely from a certain height (about 30 cm) onto a test piece using a Shore rebound hardness tester. Hardness (repulsion hardness) expressed by the height of the jump. The polyester resin has a softening point of 100.
１７０170 ° C. is used. When the softening point is less than 100 ° C, washing resistance is a problem, and when it exceeds 170 ° C, printability is a problem. The softening point of the polyester resin is preferably from 140 to 160 ° C.

When the top layer is formed from a mixture of a urethane resin and a polyester resin, their mixing ratio is not particularly limited. It is preferable to use a mixture of resins each having the above-mentioned properties.

The surface of the top layer of the printing sheet of the present invention has good smoothness. It is 500 seconds or more as measured by an Oken-type air permeability smoothness tester (manufactured by Asahi Seiko Co., Ltd.). The smoothness is determined by measuring a certain amount of air permeation time of air flowing between irregularities on the surface of the sample using an Oken type air permeability smoothness tester (type KY-5) (manufactured by Asahi Seiko Co., Ltd.). Obtained by

Such a printing sheet is prepared as follows. First, an adhesive is applied to one or both surfaces of a substrate using a doctor coating method or the like to form an under layer. Next, a layer made of a urethane resin or a polyester resin alone or as a mixture is formed on the under layer to form a top layer. When forming the top layer, cast coating, T-die method, etc.
Once a film is made of a urethane resin or a polyester resin alone or as a mixture, the film is laminated on the under layer. That is, the direct coating method is not used for forming the top layer. This is because the smoothness of the top layer surface is not improved by the direct coating method. By forming the under layer and the top layer, the printing sheet of the present invention is obtained.

The printing sheet of the present invention thus obtained can be suitably used for linen labels, process control labels, or indoor / outdoor printing materials such as signboards, banners, and posters.

[0023]

The present invention will be described below in more detail with reference to Examples, Comparative Examples and Test Examples. Example 1 A polyester-based urethane resin film (thickness: 10 μm) was obtained by cast coating. The 100% modulus of this urethane resin film was 65 kg / cm ² , and the softening point was 150 ° C. Next, a polyester fabric was used as a base material having a thickness of 100 μm, and an adhesive two-component urethane resin was applied to one surface of the base material by a doctor coating method to form an under layer. The thickness of the under layer was 3 μm. The urethane resin film was stuck on the under layer to form a top layer, thereby obtaining a printing sheet of the present invention. The smoothness of the top layer surface was 3000 seconds.

Example 2 A polyester urethane resin film (thickness: 10 μm) was obtained by cast coating. The 100% modulus of this urethane resin film was 65 kg / cm ² , and the softening point was 150 ° C. Next, a polyester non-woven fabric was used as a base material having a thickness of 200 μm, and an adhesive two-component urethane resin was applied to both surfaces of the base material by a doctor coating method to form an under layer. The thickness of both under layers was 2μ. The urethane resin film was stuck on both under layers to form a top layer, and a printing sheet of the present invention was obtained. The smoothness of both top layers is 3000 to 500
It was 0 seconds.

Example 3 A polyester urethane resin film (thickness: 30 μm) was obtained by a T-die method. 1 of this urethane resin film
The 00% modulus was 65 kg / cm ² and the softening point was 150 ° C. Next, a polyester nonwoven fabric was used as a base material having a thickness of 100 μm, and an adhesive two-component urethane resin was applied to one surface of the base material by a doctor coating method to form an underlayer. The thickness of the under layer was 5μ. The urethane resin film was stuck on the under layer to form a top layer, thereby obtaining a printing sheet of the present invention.
The smoothness of the top layer surface was 2500 seconds.

Example 4 A polyester resin (linear saturated polyester) film (thickness: 10 μm) was obtained by cast coating. The Shore rebound hardness of this polyester resin film was 77, and the softening point was 158 ° C. Next, thickness 100μ
Using a polyester non-woven fabric as a base material, an adhesive two-component urethane resin was applied to one surface of the base material by a doctor coating method to form an under layer. The thickness of the under layer was 3 μm. The polyester resin (linear saturated polyester) film was stuck on the under layer to form a top layer, thereby obtaining a printing sheet of the present invention. The smoothness of the top layer surface was 3,500 seconds.

Example 5 A polyester resin (linear saturated polyester) film (thickness: 10 μm) was obtained by cast coating. The Shore rebound hardness of this polyester resin film was 77, and the softening point was 158 ° C. Next, thickness 200μ
Using a polyester non-woven fabric as a base material, an adhesive two-component urethane resin was applied to both surfaces of the base material by a doctor coating method to form an under layer. The thickness of both under layers was 3 μm. The polyester resin (linear saturated polyester) film was stuck on both under layers to form a top layer, and a printing sheet of the present invention was obtained. The smoothness of both top layers was 3000 to 5000 seconds.

Example 6 A polyester resin (linear saturated polyester) film (thickness: 30 μm) was obtained by a T-die method. The Shore rebound hardness of this polyester resin film was 77, and the softening point was 158 ° C. Next, a polyester nonwoven fabric was used as a base material having a thickness of 100 μm, and an adhesive two-component urethane resin was applied to one surface of the base material by a doctor coating method to form an underlayer. The thickness of the under layer was 3 μm. The polyester resin (linear saturated polyester)
A film was stuck on the under layer to form a top layer, and a printing sheet of the present invention was obtained. The smoothness of the top layer surface was 4000 seconds.

Example 7 A top layer was formed from a film made of a mixture of a polyester urethane resin and a polyester resin (linear saturated polyester) (mixing ratio, urethane resin: polyester resin = 50: 50) obtained by a cast coating method. A printing sheet of the present invention of a single-sided coating type was obtained in the same procedure as in Example 1 except that the printing was performed. The smoothness of the top layer surface was 3000 seconds.

Comparative Example 1 A paint containing 20 parts by weight of nylon 6, 58 parts by weight of methanol, 24 parts by weight of calcium chloride, and 7 parts by weight of calcium carbonate was adhered to one surface of a nylon fabric (70 denier, 70 g / m ² taffeta). The coating was performed so that the amount was about 70 g / m ² , immediately after the coating, immersed in water for 5 minutes, washed with water, and dried to obtain a sheet having a nylon resin microporous layer on the surface. The weight of the sheet is 83 g / m ² , and the resin content is 13 g.
/ M ² , a thickness of 150 μm and a smoothness of the top layer of 30 μm.
It was 0 seconds.

Comparative Example 2 A paint prepared by dissolving 20 parts by weight of a polyester-based polyurethane elastomer in 80 parts by weight of dimethylformamide was used to prevent immersion of the paint. m
² immediately after application, immersed in water for 15 minutes, coagulated, extracted, washed with water, and dried to obtain a white sheet having a microporous layer on the surface and having a resin-deposited amount of 15 g / m ² and a thickness of 130μ. Obtained. The smoothness of the top layer was 450 seconds.

Test Example The printing sheet of Example 1 and the control samples of Comparative Examples 1 and 2 were tested for chemical resistance. Each of the samples printed on the top layer using a 30% aqueous sodium hypochlorite solution and a hot-melt ink is placed in a plastic container, and placed in a stainless steel pot set at 55 ° C.
Treated in hot water for 30 minutes, removed, rinsed with water and air dried. In addition, the said process was performed 1, 5 and 10 times, respectively. The strength was compared before and after the treatment, the presence or absence of the coating film, and the presence or absence of the printing ink were examined. Various chemicals were used in place of the 30% aqueous sodium hypochlorite solution, and the chemical resistance was similarly examined. The results and evaluation criteria are shown in Tables 1 and 2.

[0033]

[Table 1]

[0034]

[Table 2]

As is clear from the table, the printing sheet of the present invention has better chemical resistance than the control sample, and a remarkable difference is observed particularly in the detergents for sodium and calcium hypochlorite, hydrogen peroxide and industrial linen. .

[0036]

According to the present invention, since no wet urethane resin or polyester resin is used, hydrogen peroxide,
A printing sheet having excellent chemical resistance to sodium hypochlorite and the like can be obtained. In addition, since the film is formed once and then attached to form a top layer, good smoothness can be ensured. Further, since an under layer made of an adhesive is provided, it is not necessary to perform heat cutting, so that cold cut aptitude is imparted, and fraying at the time of heat cutting, which is seen in conventional products, is prevented.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view schematically showing a printing sheet of the present invention.

FIG. 2 is a cross-sectional view of the printing sheet of the present invention in which the warp yarn and the weft yarn of the base fabric are clearly shown.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1; Print sheet, 2; Substrate, 3; Under layer, 4; Top layer, 5; Vertical yarn, 6;

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[Procedure amendment]

[Submission date] October 29, 1998 (1998.10.
29)

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0019

[Correction method] Change

[Correction contents]

When the top layer is formed of a mixture of a urethane resin and a polyester resin, their mixing ratio is not particularly limited. It is preferable to use a mixture of resins each having the above-mentioned properties.

[Procedure amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0036

[Correction method] Change

[Correction contents]

[0036]

According to the present invention, since a wet urethane resin or nylon resin is not used, a printing sheet having excellent chemical resistance to hydrogen peroxide, sodium hypochlorite, etc. can be obtained. In addition, since the film is formed once and then attached to form a top layer, good smoothness can be ensured. Further, since an under layer made of an adhesive is provided, there is no need to perform heat cutting, and cold cut aptitude is imparted, and fraying at the time of heat cutting, which is seen in conventional products, is prevented. ────────────────────────────────────────────────── ───

[Procedure amendment]

[Submission date] July 30, 1999 (July 7, 1999)
0)

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Claims

[Correction method] Change

[Correction contents]

[Claims]

 ──────────────────────────────────────────────────の Continued on the front page F term (reference) 4F100 AK41B AK41C AK51B AK51C AK51G AL05B AL05C AT00A BA02 BA03 BA08 BA10B BA10C CB01 DG01A DG12A DG15A GB90 JA04B JA04C JB01 JK07B JK15C JK12BJK12BJK15B

Claims (6)

[Claims] 1. A base material, an underlayer made of an adhesive provided on one or both surfaces of the base material, and a top layer made of a urethane resin or a polyester resin alone or a mixture provided on the underlayer. A printing sheet characterized by comprising: 2. The printing sheet according to claim 1, wherein the base material is a single fabric of natural fibers or synthetic fibers, a woven fabric made of mixed or mixed fibers, or a nonwoven fabric made of natural fibers or synthetic fibers. 3. The printing sheet according to claim 1, wherein the urethane resin is a polyester, polyether or polycarbonate alone or in a mixture. 4. A 100% modulus of 10 to 90 kg /
The printing sheet according to claim 1, wherein the top layer is formed of a urethane resin having a softening point of 100 to 180 ° C. in cm ² . 5. The printing sheet according to claim 1, wherein the top layer is formed of a polyester resin having a Shore rebound hardness of 20 to 80 and a softening point of 100 to 170 ° C. 6. The thickness of the top layer is 3 to 30 μm,
The surface smoothness is 500 seconds or more.
The printing sheet according to any one of the preceding claims.