KR20040004301A - Printing method on water-proof fabric or seam-sealing tape; the printing machine and ink used therein; water-proof fabric or seam-sealing tape printed thereby - Google Patents

Abstract

The present invention provides a method for enabling printing with high clarity and ink adhesion to a waterproof fabric or heat sealing tape. Specifically, the present invention relates to a printing method of a waterproof fabric or heat sealing tape, which is characterized by increasing the surface tension of a surface to be printed by high frequency discharge, and the present invention also relates to a printing machine, ink, and the method used in the method. To provide a waterproof fabric or heat sealing tape. According to the printing method of the present invention, the absorbency and adhesion of the ink can be improved and a clear printed matter can be obtained. In addition, the ink on the printing surface can be completely crystallized to prevent the ink from falling off. In addition, by providing irregularities on the printing surface, it is possible to improve the wearing comfort without attaching a separate lining to the waterproof fabric, simplifying the manufacturing process of the waterproof fabric, reducing the manufacturing cost, and providing a light fabric. have.

Description

Printing method on water-proof fabric or seam tape, printing machine used in the method, ink used in the method, water-proof fabric or seam tape printed by the method sealing tape; the printing machine and ink used therein; water-proof fabric or seam-sealing tape printed thereby}

The present invention relates to a method for printing on waterproof fabric or heat-sealing tape, and to a printing machine, ink, and waterproof fabric or heat-sealed tape printed by the method used in the above method, and specifically, the surface tension of the surface to be printed by high frequency discharge. The present invention relates to a printing method of a waterproof fabric and a sealing tape, a printer equipped with a high frequency discharge surface treatment machine, an ink used in the method, and a waterproof fabric or sealing tape printed by the method.

Waterproof fabrics are used for skiwear, tents, golf wear, and other sportswear, and sealing tapes are used to protect the seams by padding them. The waterproof fabric is generally water-repellent coating to prevent water droplets from penetrating after weaving and printing the yarn, and polyurethane coating to improve waterproofness.

The waterproof fabric is used to apply a separate cloth or mesh to the polyurethane coated surface lining to improve the fit, and to express a variety of colors and designs. However, this complicates the process of product production and causes the production cost to increase. In addition, the use of a separate subsidiary material for the lining sometimes thickened the fabric and sometimes affected the clothing design.

Meanwhile, the sealing tape is made of polyurethane or PVC film, and is subjected to a bonding process of applying an adhesive to one side of the polyurethane or PVC film, and then cut and packaged to an appropriate size.

Printing methods on fabrics include gravure thermal transfer and direct gravure printing.

The gravure method refers to photographic concave plate printing using a screen used in photo making. Printing plates used in gravure printing include film corrosion plates, electronic engraving plates and laser engraving plates.

Film Corrosion Plate can express sufficient concentration and gradation even at 15 micron depth by applying photoresist to copper plated cylinder and developing the film. Recently, it prints up to 7 ~ 12 micron depth using high density ink. Can be realized.

Electronic engraving plate is a method of engraving the chain of chain directly on the surface of the copper plated cylinder through the electronic automatic control device. This shortens the photographing process, saves the film, and eliminates the need for a printing plate making process (photosensitive material coating, exposure, development, corrosion), which is essential in the film corrosion forming process.

On the other hand, the laser engraving plate is a method that takes only the advantages of the film corrosion plate and electronic engraving plate, the coating is applied to the surface of the cylinder is carved using a laser beam, and is produced through the corrosion process.

The gravure thermal transfer method has a problem in that deformation of the fabric during high heat is applied, the ink is broken during transfer, or the ink adhesion is weakened, so that the final printing state is not clear. In particular, there are drawbacks that cannot be used at all in fabrics and films that are heat-sensitive.

On the other hand, in the direct gravure method, there is no process of applying high heat as in the gravure thermal transfer method, but the ink transition is poor and the ink adhesion is weak, so that the bleeding or tearing of the ink often occurs. In addition, ink may be discolored by light.

In particular, gravure prints have many problems after washing, including dry cleaning, because they do not satisfy the water resistance and solvent resistance of water, detergents and petroleum solvents used in the washing process. .

Furthermore, after the water repellent coating treatment performed essentially on the waterproofing fabric, the water repellent coating agent is finely transferred to the polyurethane coating surface, thereby causing a problem of difficulty in printing on the polyurethane coating surface.

In order to solve the above problems, an object of the present invention is to improve the adhesion between the waterproof fabric or heat sealing tape and ink, and to provide a clear print.

It is also an object of the present invention to provide a printer and ink for use in the method.

Furthermore, an object of the present invention is to provide a waterproof fabric or heat sealing tape printed by the above method.

1 is a perspective view of a high frequency discharge surface treatment machine mounted on a printing press

Figure 2a is a result of taping experiments of the heat-sealing tape printed after high frequency discharge surface treatment

Figure 2b shows the results of taping experiments of heatsink tape printed without high frequency discharge surface treatment.

Explanation of reference numerals

10: electrode bar 20: roller coated with a derivative

30: insulator cover 40: power supply line

50: waterproof fabric

In order to achieve the above object, the present invention is a method for printing a waterproof fabric or heat sealing tape, characterized in that it comprises a surface treatment step by a high-frequency discharge and a curing step after printing of the direct gravure method. Provides a method of printing a tape.

The waterproof fabric is after weaving, printing and water repellent coating, and then coated with polyurethane, then rolled or supplied in a rolled state, or after weaving and printing yarn, omitting a water repellent coating process, rolling by polyurethane coating It may be supplied in a state. On the other hand, the sealing tape may be a rolled polyurethane or PVC film as it is, or after a bonding treatment for applying an adhesive on one side.

On the other hand, after the direct gravure printing, the drying process of the ink is included, which is performed while passing through the chamber through which hot air is supplied.

In addition, the present invention provides a printing method of the waterproof fabric, characterized in that it comprises a water-repellent coating step after the direct gravure printing in the waterproof fabric. That is, this is after printing the water repellent coating process of the waterproof fabric.

If the water-repellent coating is applied before coating with polyurethane on the waterproof fabric (repellent water repellent), the water-repellent coating agent is finely transferred to the polyurethane coated surface, which causes the surface tension to drop. Therefore, by performing the water repellent coating after printing (post-water repellent), the cause of dropping the surface tension of the surface to be printed can be eliminated.

By surface treatment by the high frequency discharge, the surface tension of the polyurethane coated surface of the waterproof fabric and the sealing tape should be increased to 36 dyen / cm · 20 ° C. or more to obtain a desirable printing result. This is because when the surface tension is 34 dyen / cm · 20 占 폚 or less, the ink to be printed does not spread out on the surface, which makes printing difficult.

In addition, the high frequency discharge is useful for the printing operation because the ultra-fine pores are formed on the surface treated surface, the ink penetrates into the pores during printing, so that the absorption and adhesion of the ink is improved, the ink bleeding phenomenon It can be prevented.

Specifically, the surface treatment by the high frequency discharge is performed in the high frequency discharge surface treatment machine shown in FIG. That is, between the electrode bar 10 connected to a high voltage of 10-40 KV and a high frequency power source of 1-4 MHz, preferably between the roller 20 coated with a derivative 1 to 4 mm away from the electrode bar 10, the waterproof fabric or heat sealing As the tape passes, it breaks down the molecular bonds on the surface by discharging, and creates polar groups (-CO, -COOH, -OH) on the surface of the polyurethane coating or the sealing tape of the waterproofing fabric to increase the surface energy of the surface. will be.

If the distance between the electrode bar 10 and the roller 20 coated with the derivative is less than 1 mm, holes may be formed in the fabric, and if it is more than 4 mm, the surface treatment effect cannot be expected. In addition, as the printing speed increases, high surface voltages may be used to increase the surface tension. The printing speed refers to the speed at which the waterproofing fabric or heat sealing tape passes through a printing machine in which surface treatment by high frequency discharge and direct gravure printing are performed.

The ink used in the direct gravure printing step includes pigment white (TiO ₂ ), organic pigment (colored), urethane resin and vinyl resin.

Preferably, the ink contains 25 to 30% of pigment white (TiO ₂ ), 9 to 14% of organic pigments (coloured), 40 to 48% of urethane resin, and 4 to 7% of vinyl resin.

In addition, the ink is preferably used with a urethane curing agent. Since it is thermosetting, it is not only to accelerate the curing speed but also to achieve a completely crystallized printing surface after the curing is all proceeded. This completely crystallized printing surface can be kept longer than the uncured printing surface.

As the urethane curing agent, it is preferable to use a liquid phase composed of an ethyl acetate mixture as the polyisocyanate copolymer. And it is preferable to use 0.04-0.05 weight part of ink of the said urethane hardening | curing agent.

The curing in the curing step is preferably performed for 40 to 48 hours at a temperature of 40 ~ 50 ℃ in the case of waterproof fabric. However, because the sealing tape is weak to heat as the polyurethane or PVC film itself, it is preferable to perform at a temperature of 34 ~ 38 ℃.

In another embodiment, the present invention provides a printing machine equipped with a high frequency discharge surface treatment machine. This includes the electrode bar 10 shown in FIG. 1 and a roller 20 coated with a derivative positioned in parallel with the electrode bar 10 at a distance of 1 to 4 mm from the electrode bar 10. It is equipped with a high frequency discharge surface treatment. The electrode bar 10 is protected by an insulator cover 30 and is supplied with power through a power supply line 40 connected from a high voltage transformer to enable high voltage and high frequency discharge.

The high frequency discharge surface treatment machine is mounted in front of the plate making rollers of the printing press, so that the surface of the water resistant fabric or sealing tape is discharged immediately before the waterproofing fabric or the sealing tape enters the printing plate of the printing machine and is printed. That is, the surface treatment and the gravure printing by the high frequency discharge by the printing press can be sequentially performed in one process.

As another embodiment, the present invention provides an ink including a pigment white (TiO ₂ ), an organic pigment (colored), a urethane resin, a vinyl resin, an additive, and a solvent.

Preferably, the ink is pigment white (TiO ₂ ) 25-30% by weight, organic pigment (colored) 9-14%, urethane resin 40-48%, vinyl resin 4-7%, additives 4-6% and solvent 13 Contains ~ 25%.

The pigment white (TiO ₂ ) is a kind of inorganic pigment, and has a high light resistance, but a small coloring power and a lack of color tone. Therefore, a small amount of organic pigment (colored) is added for color development. In particular, as the organic pigment included in the ink of the present invention, it is preferable to use one having high light resistance, in order to prevent discoloration of the printed matter.

The additives include an antistatic agent, a dispersant, an antifoaming agent, an adhesive enhancer, WAX, and the like, which are added in small amounts during ink production to improve the physical properties of the ink.

It is preferable to use a mixed solvent of methyl ethyl ketone (MEK), toluene and ethyl acetate (EA) as the solvent.

The present invention provides, in one embodiment, an ink further comprising a blowing agent or a concave-convex member as ink used in particular for printing a waterproof fabric. This is to improve the fit without adding a separate lining to the polyurethane coated surface of the waterproof fabric.

The blowing agent is foamed when heat is applied, thereby causing irregularities on the printing surface. Foaming of the blowing agent takes place through the chamber, which is a drying step after printing.

Another method of giving unevenness to the printed surface is to physically give unevenness by mixing stone powder, silicon earth or hard coal powder in the ink. This giving irregularities to the printing surface by the foaming agent or the physical method improves the fit of the waterproof fabric and can be used without attaching a separate lining.

Hereinafter, the present invention will be described in detail through examples. However, this invention is not limited to the following Example.

Example 1-1 (Printing Surface of Waterproof Fabric)

(1) preparation of ink

Pigment white (TiO ₂ ) 2.5kg, organic pigment 1kg, urethane resin 4.0kg, vinyl resin 0.5kg, antistatic agent 0.1kg, adjuvant 0.1kg, defoamer 0.1kg, adhesive adjuvant 0.2kg, foaming agent 0.1kg 1.5L solvent ( The ink was prepared by adding to MEK: toluene: EA = 2: 1: 2 mixed solvent) and stirring until the powder was completely mixed. 0.4 kg of polyisocyanate was added here as a urethane hardening | curing agent, and it stirred well.

(2) High frequency discharge surface treatment and direct gravure printing

After weaving and printing the yarn, the polyurethane coated waterproof fabric was prepared in a rolled state, which was hanged on a printing machine, and surface treatment and printing by high frequency discharge were performed. As the ink, the ink prepared in the above (1) was used. When the waterproof fabric 50 released from the roll passes between the high frequency discharge surface treatment machine, that is, the electrode bar 10 and the roller 20 coated with the derivative, mounted in front of the plate making rollers of the printing press, the surface treatment is performed by the high frequency discharge. It became. Then, the waterproof fabric was inserted into the plate making roller of the printing machine sequentially to print. The printing speed was 10 m / min.

The ink was dried by passing the waterproof fabric through the press through the chamber. In the chamber, the ink was dried by hot air at 40 ° C. At this time, the speed of the waterproof fabric passing through the chamber was also maintained at 10m / min.

(3) Water repellent coating

The waterproof fabric passed through the chamber was treated with a water repellent coating solution and a water repellent coating method.

(4) hardening

After the water repellent coating, the waterproof fabric was cured at a temperature of 45 ° C. for 40 hours to complete printing of the waterproof fabric.

Example 1-2

In Example 1-1 (1), except that 0.1 kg of silicon earth was put in place of the blowing agent included in the ink, printing was performed on the waterproof fabric in the same manner as in Example 1-1.

Comparative Example 1-1

Except that the surface treatment process by the high frequency discharge was omitted, the printing operation of the waterproof fabric was performed in the same manner as in Example 1-1.

Comparative Example 1-2

After weaving and printing the yarns, a water-repellent coating and a polyurethane-coated waterproofing fabric were prepared in a roll wound state, which was hung on a printing machine and subjected to surface treatment and printing by high frequency discharge. The ink used in the printing operation, the surface treatment by the high frequency discharge in the printing press, the printing operation, and the drying process through the chamber were the same as in Example 1-1 (2). Then, the printed waterproof fabric was completed by curing the printed waterproof fabric at a temperature of 45 ° C. for 40 hours.

Comparative Example 1-3

A printing operation was performed on the waterproof fabric in the same manner as in Example 1-1, except that ink was prepared without adding a blowing agent in Example 1-1 (1).

Example 2 (printing of heat sealing tape)

Printing was carried out on the sealing tape using the ink prepared in Example 1-1 (1) and the printing machine of FIG. The heat sealing tape inserted into the printing press is prepared in a state in which one surface is bonded and rolled. The peeling tape released from rolling was surface-treated and printed while passing through the high frequency discharge surface treatment machine and the plate making roller of the printing machine, and the ink was dried while passing through the chamber. At this time, the speed through the printing press and the chamber was 10 m / min, and the drying temperature in the chamber was 35 ° C. The heat-sealing tape passed through the chamber was cured at 35 ° C. for 40 hours to complete printing.

Comparative Example 2

The sealing tape was printed in the same manner as in Example 2 except that the surface treatment process by the high frequency discharge was omitted.

Test 1 (Measurement of Surface Tension)

Surface tension of polyurethane coated surface and heat-sealing tape using water-tightness measuring reagent (Granite Co., Ltd., Japan) and waterproofing material and water-sealed tape after surface treatment by high frequency discharge in Examples 1-1 and 2 Surface tension was measured. The results are shown in the table below.

Waterproof Fabric Sealing Tape Before high frequency discharge surface treatment 34 30 or less After high frequency discharge surface treatment 40 41

(Unit: dyne / cm · 20 ℃)

Test 2 (Adhesion Test of Ink 1-Taping)

To test the adhesion of the printed ink on the waterproof fabric and heat sealing tape, a taping experiment was performed. This was followed by attaching the OPP tape to the printed surfaces of Examples 1-1, Comparative Examples 1-1 and 1-2, Example 2, and Comparative Example 2, and then peeling off the tape in an instant to observe the extent of ink dropping out of the tape. It is.

Figure 2a is a photograph taken the printing surface after the tape sealing experiment of Example 2, there was no ink falling off by the OPP tape was confirmed that the printing state is maintained as it is. On the other hand, Figure 2b is a printing surface after the taping experiment of Comparative Example 2 heat sealing tape, it can be observed that most of the ink is removed from the printing surface.

This was also the case in Example 1-1, Comparative Examples 1-1 and 1-2. That is, in the waterproof fabric according to Example 1-1, the printing state of the printing surface was maintained well even after the taping experiment, whereas the ink was released with the tape from the waterproof fabric printing surfaces of Comparative Examples 1-1 and 1-2. It could be observed.

In particular, when comparing the water-repellent coating before the polyurethane coating and the water-repellent coating after printing from the waterproofing fabric from Example 1-1 and Comparative Example 1-2, the water-repellent coating after printing was found to have a strong adhesion of the ink. That is, it was confirmed that the post-water repellent treatment further improved the adhesion of the ink together with the surface treatment by the high frequency discharge.

Test 3 (Adhesion Test of Ink 2-Laundry)

In order to test the adhesion of the ink printed on the waterproof fabric and heat sealing tape, the waterproof fabric and heat sealing tape of Examples 1-1, Comparative Examples 1-1 and 1-2, Example 2, and Comparative Example 2 were used. Water washing (using a neutral detergent) and dry cleaning (using a petroleum solvent).

As a result, the waterproofing fabric and the sealing tape of Examples 1-1 and 2 did not change in the printing state even after washing and dry cleaning, but the waterproofing fabric and the sealing tape of Comparative Examples 1-1, 1-2 and 2 were not changed. In addition to the dropping of the silver ink, the remaining ink was also smeared and it was observed that the printing condition was very poor.

To summarize the above tests 2 and 3, it was found that the surface treatment by the high frequency discharge of the polyurethane coated surface and the sealing tape of the waterproof fabric and the water-repellent coating treatment on the waterproof fabric after the printing operation improve the adhesion of the ink. Can be.

Test 4 (wearing test)

This time, in order to compare the surface of the waterproof fabric was made of the waterproof fabric printed in Examples 1-1, 1-2 and Comparative Example 1-3 to test the fit. At this time, the waterproof fabrics were made without applying a separate lining.

As a result, the waterproofing fabrics of Examples 1-1 and 1-2 were both given a rough feeling and were excellent in fit. However, the wearer felt frustrated after 30 minutes of wearing the fabric made of the waterproof fabric of Comparative Example 1-3.

According to the water-proof fabric or heat-sealing tape printing method of the present invention, the surface tension was increased by treating the polyurethane coated surface and heat-sealing tape of the water-resistant fabric with high frequency discharge surface treatment. In particular, in the case of the waterproof fabric, the water repellent coating treatment was performed after printing, thereby preventing the microtransition of the water repellent coating liquid to the polyurethane coating surface. As a result, the absorbency and adhesion of ink can be improved, and a clear printed matter can be obtained.

In addition, the ink on the printing surface can be completely crystallized to prevent the ink from falling off.

In addition, by providing irregularities on the printing surface, it is possible to improve the wearing comfort without attaching a separate lining to the waterproof fabric, simplifying the manufacturing process of the waterproof fabric, reducing the manufacturing cost, and providing a light fabric. have.

Claims (12)

A method of printing a surface of a waterproof fabric or heat-sealing tape, the method of printing a waterproof fabric or heat-sealed tape, comprising a surface treatment step by high frequency discharge and a post-curing curing step of a direct gravure method. The printing method of the waterproof fabric of claim 1, further comprising a water-repellent coating step after the printing of the direct gravure method. The method of claim 1, wherein the surface treatment step of the high frequency discharge is to increase the surface tension of the polyurethane coated surface or the sealing tape of the waterproof fabric to 36dyen / cm · 20 ℃ or more printing of the waterproof fabric or sealing tape Way. The ink of claim 1, wherein the ink used in the printing method of direct gravure includes pigment white (TiO ₂ ), organic pigment (colored), urethane resin, and vinyl resin, and is used by mixing a urethane curing agent. Printing method of fabric or heat sealing tape. The method of claim 4, wherein the urethane curing agent is a polyisocyanate copolymer, which is a liquid made of an ethyl acetate mixture. According to claim 1, wherein the curing step in the curing time is 40 to 48 hours, the curing temperature is characterized in that the curing at a temperature of 40 ~ 50 ℃ in the case of waterproof fabric, the temperature of 34 ~ 38 ℃ in the case of sealing tape Printing method of waterproof fabric or heat sealing tape. A high frequency discharge surface comprising an electrode bar 10 and a roller 20 coated with a derivative positioned in parallel with the electrode bar 10 with a spacing a of 1 to 4 mm from the electrode bar 10. A printing machine used in the method of any one of claims 1 to 6, wherein the processor is mounted in front of the plate making roller of the printing machine. An ink used in the method of any one of claims 1 to 6, comprising a pigment white (TiO ₂ ), an organic pigment (colored), a urethane resin, a vinyl resin, an additive and a solvent. The ink according to any one of claims 1 to 6, wherein the solvent is a mixed solvent of methyl ethyl ketone (MEK), toluene and ethyl acetate (EA). 9. The ink used in the method of any one of claims 1 to 6, further comprising a blowing agent or an uneven member. The ink according to any one of claims 1 to 6, wherein the uneven member is stone powder, silicon earth, or hard coal powder. A waterproof fabric or printed heat sealing tape printed by the method of any one of claims 1 to 6.