JP2002371484A - Resin processed cloth for inkjet printing - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To provide a resin processed cloth having excellent ink jet printability and high frequency weldability. A base fabric is coated on both sides with a waterproof resin layer (A), and at least one outermost surface has a particle diameter of 0.1.
A resin-worked cloth for ink-jet printing comprising a resin layer (B) containing 10 to 70% by weight of silicon oxide of 10 to 10 μm and having a thickness of 0.1 to 20 μm.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention proposes a resin processed cloth which is excellent in ink jet printability and has high frequency weldability. Further, it can be replaced with an environment-friendly resin composition which does not generate harmful combustion gas such as dioxin. Therefore, it can be used for various film materials requiring various ink jet printability, such as various large signboard film materials, various tents and track sheets.

[0002]

2. Description of the Related Art Conventionally, ink-jet printing materials used for various large-scale signboard materials include a film material in which both surfaces of a fabric are coated with a soft vinyl chloride resin (hereinafter simply referred to as PVC-treated cloth). Are mainly applied and adopted. The PVC processed cloth has a feature that the PVC resin itself has a high polarity, and therefore, the transferability of the ink jet ink is relatively good.

[0003] However, when ink-jet printing is performed using a conventional PVC processed cloth, the transferability of the ink to the printing surface is relatively good, but the sharpness is poor, and the printing boundary is blurred. Have. Furthermore, since the plasticizer contained in the resin easily bleeds to the surface layer of the film material, the ink has poor adhesion. There is a problem in printing durability such as rubbing of the printed portion, causing troubles such as blurring in the printed portion, and gradually deteriorating the clarity of the printed surface when put to practical use for a long time. As means for solving this, a surface treatment agent represented by an acrylic ester is applied to the surface of the PVC processed cloth using a gravure coating machine,
Although a method of suppressing bleeding of the plasticizer has been proposed,
In fact, the improvement is insufficient.

On the other hand, ethylene-vinyl acetate copolymer resin (hereinafter simply referred to as EVA resin) has been demanded from the market in recent years in view of environmental considerations to avoid PVC processed cloth which may generate dioxin during combustion. In some cases, non-halogen-based film materials (e.g., the same) are coated on both sides of the fabric, but the ink has poor transferability due to low resin polarity, and satisfactory ink-jet printability is not secured.

[0005]

The inventors of the present invention have conducted intensive studies to solve the above-mentioned problems, and as a result, have found that silicon oxide powder is contained in a resin for surface treatment applied to the outermost surface layer of a resin-treated cloth. It has been found that by incorporating the compound, extremely excellent ink jet printability can be obtained. More non-halogen EVA
It has been found that a work cloth in which a resin is coated on both sides of a fabric can obtain extremely excellent ink jet printability by providing a primer resin layer having high adhesiveness on both surfaces of the EVA resin layer.

[0006]

That is, according to the present invention, both surfaces of a base fabric are coated with a waterproof resin layer (A), and at least one outermost surface is coated with silicon oxide having a particle diameter of 0.1 to 10 μm. -70% by weight and a thickness of 0.1-2
It is a resin-processed cloth for ink-jet printing composed of a resin layer (B) having a thickness of 0 μm, and the above-mentioned resin-processed cloth for ink-jet printing that satisfies all of the following conditions 1) to 2). 1) The waterproof resin layer (A) covering both surfaces is a soft vinyl chloride resin or an ethylene-vinyl acetate copolymer resin. 2) A resin layer (B) forming at least one outermost surface layer.
Wherein the main resin is made of an acrylate resin, a urethane-based resin and / or a polyamide-based resin, and the present invention provides a resin-processed cloth (A) in which the waterproof resin layer (A) is made of an ethylene-vinyl acetate copolymer resin. Thickness 1 on both surfaces of the layer
The resin-worked cloth for ink-jet printing, wherein the primer layer (a) having a thickness of 10 μm to 10 μm is formed.

[0007] The base fabric for a resin-processed cloth used in the present invention is made by weaving filament yarns and spun yarns made of inorganic fibers typified by glass fibers, synthetic fibers such as polyesters and polyvinyl alcohols, such as plain weaves and twills. Alternatively, it may be formed of a netting typified by Russell or the like, or may be a knitted or nonwoven fabric. In addition, since the PVC resin used as one of the waterproof resins (A) disposed on both sides of the base fabric has a high polarity, it is relatively excellent in terms of the transferability of the inkjet ink, Conventionally, a plasticizer such as dioctyl phthalate, which is widely and generally used as a film material, is added in an amount of 50 to 100 parts by weight of the PVC resin.
A resin containing 90 parts by weight is generally used. Further, a flame retardant such as antimony trioxide may be blended to ensure flame retardancy, or a pigment, an inorganic filler such as calcium carbonate, and a PVC stabilizer may be blended as necessary.
The coating amount of the waterproof resin (A) is 1 to 20 in terms of resin solid content.
A range of 0 g / m ² is preferred.

EVA resin used as one of the non-halogen resins of the waterproof resin (A) is excellent in high-frequency heat generation, flexibility and high-temperature characteristics, and has a vinyl acetate content of 1%.
An EVA resin of 0 to 40% by weight, more preferably 15 to 30% by weight is used. The vinyl acetate content of the EVA resin may be composed of a single resin component, or may be composed of two or more EVA resins having different vinyl acetate contents. Further, in order to ensure flame retardancy, a phosphorus-based flame retardant and a water-containing inorganic filler such as aluminum hydroxide may be blended, or a pigment, an ultraviolet absorber, an antioxidant, and the like may be blended as necessary. Good.

The most characteristic feature of the present invention is that it is incorporated in a resin layer (B) forming at least one outermost surface layer of the resin-treated cloth (hereinafter, may be simply referred to as the outermost resin layer (B)). The silicon oxide to be formed has a particle size in the range of 0.1 to 10 μm and a content in the resin forming the outermost surface resin layer (B) of 10 to 70% by weight from the viewpoint of inkjet printability. Needs to be If the particle size is less than 0.1 μm, the unevenness of the outermost resin layer (B) is insufficient, so that the effect of improving the inkjet printability is insufficient. Conversely, if the particle size exceeds 10 μm, silicon oxide tends to fall off during printing, resulting in a result. The printing durability is insufficient. Preferably it is 0.5 to 8 μm, more preferably 1 to 6 μm.

On the other hand, if the content of silicon oxide in the outermost resin layer (B) is less than 10% by weight, the effect of improving the ink jet printability becomes insufficient. Since the peel strength of B) is largely lost, durability becomes a problem. Preferably it is 20 to 60% by weight, more preferably 30 to 50% by weight. The thickness of the outermost resin layer (B) to be formed needs to be in the range of 0.1 to 20 μm. If the thickness is less than 0.1 μm, the effect of improving ink jet printability is insufficient, and clear and sharp printing cannot be obtained. Conversely, if the thickness exceeds 20 μm, the necessity for improving the printability is eliminated, the cost is increased, and the resin processed cloth becomes stiff. Preferably it is 1-10 micrometers, More preferably, it is 3-8 micrometers.

As the resin material constituting the outermost resin layer (B), a resin for surface treatment such as a PVC resin can be used, but an acrylic acid ester resin having a relatively high polarity in terms of ink jet printability. , A urethane-based resin and / or a polyamide-based resin are preferred, and the case where the main resin component is a urethane resin is more preferred. Specific examples of the acrylate resin include, but are not particularly limited to, acrylates including an alkyl group having C = 1 to 12, and the like, and copolymers with vinyl acetate, acrylonitrile, and the like are also applicable. It is. As specific examples of the urethane resin, polyester, polyether and polycarbonate urethane can be applied. Further, as specific examples of the polyamide resin, nylon 6, nylon 66, nylon 12, nylon 17, and the like are applicable.

On the other hand, in the case of a non-halogen-based EVA-based resin processed cloth, since the polarity of the EVA-based resin is low, the outermost surface resin layer (B) is directly coated in the same manner as in the case of the PVC resin-processed cloth. , Its interlayer adhesion is extremely weak. In order to solve this problem, as shown in FIG. 2, a primer capable of firmly bonding the interlayer between the waterproof resin layer (A) made of an EVA resin and the outermost resin layer (B) for ensuring ink jet printability. It is necessary to coat and provide layer (a).

Further, in the structure of the resin-treated cloth, thermal bonding such as a high-frequency welder can be performed between the front surface and the back surface of the processed cloth. Thermal bonding such as a high-frequency welder between them is not ensured. In order to secure this, the problem is solved by applying the primer layer (a) also to the back surface of the processed cloth. The thickness of the formed primer layer (a) is 1 to
It is in the range of 10 μm, more preferably in the range of 3 to 7 μm. By such a treatment, a resin-processed cloth having both good ink-jet printability and thermal bonding properties such as a high-frequency welder between sheets, which cannot be obtained by the conventional technique even with a non-halogen-based resin-processed cloth, can be obtained.

On the other hand, the resin used for the primer layer (a) is an EVA resin having a vinyl acetate content in the range of 30 to 50% by weight, or a modified olefin having a hydroxyl group, a carboxyl group or the like introduced in the molecule. Resins, etc.,
It is preferable to apply the resin by dissolving it in a solvent represented by toluene or the like.

[0015]

EXAMPLES The present invention will be described below with reference to examples, but the present invention is not limited to these examples. In the present invention, the methods for measuring the ink transferability, the rubbing property, the high-frequency welder bonding property, and the average particle diameter of silicon oxide mean those evaluated by the following test methods.

[Ink transferability] Cellotape (registered trademark)
After a commercially available cellophane tape was attached to the printing surface by a method (simple method), the cellophane tape was peeled off from the printing surface, and the presence or absence of transfer of the ink to the cellophane tape side was visually evaluated. [Scratchability] Scratchability was visually evaluated using a friction tester type II in accordance with JIS L0849 (Testing method for color fastness to friction). [High-frequency welder bonding property] High-frequency welder machine (manufactured by Pearl Industry Co., Ltd., product number T-1200, frequency 38.8M)
Hz, an output of 3 kW), an electrode having a width of 3 cm and a length of 15 cm was attached, and the electrodes were overlapped so that the front and back surfaces of the resin processing cloth were in contact with each other. Then, a pressing force of 10 N / cm ² , an anode current value of 0.55 A,
Welding was performed with an energization time of 3 seconds. This welded sample is JIS
The peel strength was measured according to K6328. [Average Particle Diameter of Silicon Oxide] Arbitrary 100 particle diameters were measured with a scanning electron microscope, and the average particle diameter was determined from the arithmetic mean value.

Example 1, Comparative Example 1 (1) Emulsion-polymerized PVC was applied to both sides of a plain woven fabric having a warp density of 52 yarns / inch and a weft density of 45 yarns / inch, using a 10th polyester spun yarn. (Polymerization degree 1700, ZEON 121 manufactured by Zeon Corporation) 100 parts by weight of a plasticizer, 70 parts by weight of dioctyl phthalate, 10 parts by weight of antimony trioxide, 2 parts by weight of a pigment, and 3 parts by weight of a stabilizer, coated by a knife coating method. And 130 ° C
For 2 minutes and then at 180 ° C. for 1 minute to obtain a resin processed cloth. In this case, the applied amount of the front and back of the fabric is 13
It was 0 g / m ² . (2) Further, a mixture of silicon oxide having an average particle diameter of 2.5 μm and a non-yellowing type polyester urethane resin in a weight ratio of 1: 1 (manufactured by Honey Kasei Co., Ltd., U-4747) was mixed with methyl ethyl ketone / ketone (weight). Dissolved in a solvent (ratio = 6/4)
Disperse, solid content concentration 2 for forming outermost layer resin layer (B)
A 3% by weight solution was obtained. This solution was coated on one side of the resin-treated cloth obtained in the above (1) with a roll coater at a solid content of 10 g /
m ² and dried at 100 ° C. for 3 minutes.
An outermost surface resin layer (B) having a thickness of 6.7 μm was formed, and a resin processed cloth (Example 1) of the present invention was produced. (3) On the other hand, a solution having a solid content of 23% for forming the outermost resin layer (B) having the composition of the above (2) and containing no silicon oxide and having the composition of the above (2) was obtained by the above (1) using the same resin processed cloth. Resin-coated cloth coated on one side of the processed resin-coated cloth with a roll coater so as to have a solid content of 10 g / m ² to form an outermost surface resin layer (B) having the same thickness as in (2) above (Comparative Example) 1) was prepared. (4) Using the work cloth of (2) or (3) above, printing was performed by an inkjet printer (model PJ3600, manufactured by Olympus Sales Co., Ltd.), and the outermost resin layer (B) containing silicon oxide of the present invention was formed. Resin-coated cloth (Example 1) coated with a solution for use is the outermost surface resin layer (B) containing no silicon oxide
The transferability of the ink was better than that of the resin-treated cloth coated with the forming solution (Comparative Example 1), and the printing was extremely sharp without ink bleeding. Also in the evaluation by the rubbing test, good printability was obtained without the ink falling off.

Example 2 (1) A plain weave fabric having a warp density of 20 yarns / inch and a weft density of 20 yarns / inch using a 550 dtex polyester filament yarn is used as a base fabric. Wt% EVA (Smitate H203
1: a sheet made of Sumitomo Chemical Co., Ltd.) having a thickness of 0.2 mm was heat-laminated to form a waterproof resin layer (A), and a resin-treated cloth was prepared. (2) Carboxyl group-modified polyolefin resin solution (P-957; on both surfaces of the resin-treated cloth obtained in (1) above)
Honey Chemical Co., Ltd.) was coated with a gravure roll at a solid content of 5 g / m ^{2 and} dried at 80 ° C. for 3 minutes to obtain a thickness of 5 μm.
m of the primer layer (a) was formed. (3) Further, a mixture of polyamide-based nylon 6 resin and silicon oxide in a weight ratio of 40/60 (manufactured by Honey Chemical Co., Ltd., Hanitop T-706M) was mixed with methanol / toluene = 1 /
Solids concentration 18% dispersed / dissolved in 1 (weight ratio) solvent
A solution for forming the resin layer (B) was prepared. Using a gravure coater, apply this solution at 5 g / m ² at a solid content on one surface of the resin-treated cloth on which the primer layer (a) is formed, and then dry at 80 ° C. for 3 minutes to dry the outermost surface having a thickness of 3 μm. A resin processed cloth on which the layer resin layer (B) was formed was obtained. (4) When the ink-jet printability of the resin-processed cloth obtained in the above (3) was evaluated, the ink transferability was good.
Moreover, the printing was extremely sharp without ink bleeding. Also, in the evaluation by the rubbing test, good printability was obtained without the ink falling off. When a high-frequency welder bonding test was performed on the front and back surfaces of the resin-treated cloths, the peel strength was 110 N / 3 cm, and good bondability was obtained.

Prior art example A PVC resin processed cloth in which the outermost surface resin layer (B) is not formed according to Example 1, and an outermost surface resin layer (B) and a primer layer (a) are formed according to Example 2. EV not doing
A resin-treated cloth was prepared, and the ink jet printability was evaluated. However, the ink transferability and rubbing property were extremely poor, and printing was impossible. Although the outermost resin layer (B) is formed according to Example 2, the resin layer (B) does not contain silicon oxide and the EVA resin processing does not form the primer layer (a). A cloth was prepared, and a high-frequency welder bonding test was performed with the front and back sides of the resin-treated cloth overlapped, but no bonding was performed.

[0020]

The resin-treated cloth of the present invention has a waterproof resin layer (A).
Is provided with a resin layer (B) forming a top surface layer containing a specific particle size and a specific amount of silicon oxide on at least one surface of a resin processed cloth made of PVC or EVA. Unobtained inkjet printability is obtained. In addition, in the case of a non-halogen resin processed cloth made of EVA having a low polarity, a primer layer (a) is provided between a waterproof resin layer (A) made of EVA and a resin layer (B) to thereby obtain a conventional EVA resin having a low polarity. Inkjet printability, which cannot be obtained with a work cloth, can be obtained, and bonding of a high-frequency welder or the like is possible. Therefore, the resin processed cloth obtained in the present invention can be used for various film materials required for various ink jet printability such as various large-sized signboard film materials, various tents and track sheets.

[0021]

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a configuration of a resin processed cloth using a non-halogen EVA resin as a waterproof resin.

FIG. 2 is a cross-sectional view of the structure of the resin-treated cloth of the present invention using a soft vinyl chloride resin as a waterproof resin.

[Explanation of symbols]

 1: Waterproof resin layer (A) 2: Primer layer (a) 3: Resin layer containing silicon oxide (B) 4: Fabric layer 5: Waterproof resin layer (A) 6: Resin layer containing silicon oxide (B) 7 : Fabric layer

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 2C056 EA05 EA13 FB03 FC06 2H086 BA01 BA15 BA19 BA22 BA33 BA34 4H057 AA01 CA21 CA37 CB08 CB46 CB54 CC01 DA01 GA06

Claims (3)

[Claims] 1. A base cloth is coated on both sides with a waterproof resin layer (A), and at least one outermost surface has a particle size of 0.1.
A resin-processed cloth for ink-jet printing, comprising a resin layer (B) containing 10 to 70% by weight of silicon oxide of 1 to 10 μm and having a thickness of 0.1 to 20 μm. 2. The resin-processed cloth for ink-jet printing according to claim 1, which satisfies the following conditions 1) to 2). 1) The waterproof resin layer (A) covering both surfaces is a soft vinyl chloride resin or an ethylene-vinyl acetate copolymer resin. 2) A resin layer (B) forming at least one outermost surface layer.
The main resin of the acrylic resin, urethane resin and / or polyamide resin, 3. A primer layer (a) having a thickness of 1 to 10 μm is formed on both surfaces of a layer (A) of a resin-treated cloth in which a waterproof resin layer (A) is made of an ethylene-vinyl acetate copolymer resin. Item 3. The resin processed cloth for inkjet printing according to Item 1 or 2.