KR100478954B1 - Method for transfering various color images on a surface of leather and the leather prepared by the same - Google Patents

Abstract

The present invention comprises the steps of: (a) generating a color image having a plurality of colors on a computer screen; (b) printing the image on a polysiloxane surface layer of a transfer sheet; (c) cleaning the leather to which the image is to be transferred; (d) heating and drying the leather to which the image is to be transferred; (e) covering the transfer paper on the leather and applying heat and pressure such that the polysiloxane surface layer contacts the dried leather; And (f) removing the transfer paper from the leather and cooling it to room temperature, thereby providing a method of transferring a color image to the surface of the leather and a leather produced by the method.

According to the present invention, it is possible to transfer a variety of colors to the surface of the leather by a simple process, the manufactured leather has the advantage that the colored surface is not easily peeled off because of its durability.

Description

Method for transfering various color images on a surface of leather and the leather prepared by the same}

The present invention provides a method for transferring color images having various colors to the surface of leather by a simple process, and leather produced by the above method.

Conventionally, leathers with a single color are mainly used, but recently, researches and developments on a method for expressing various colors in leather have been actively conducted, and there are largely the following methods.

The first method is to weave pieces of color-dyed leather into pieces. This method is complicated in processing, requires a high labor force, has high manufacturing costs, and has problems in mass production. There is a limit to expression.

The second method is a silkscreen method, in which a screen having an image to be expressed is made and placed on the leather, and various dyes are added to form various images on the surface of the leather. Similarly, the complexity of the process, high manufacturing cost, and mass production There is a problem such as a limitation of the color expression.

The third method is a transfer roller method, in which an image to be expressed is engraved on a roller, printed on a transfer sheet, and then transferred to leather. The initial production cost is increased, and a variety of colors and designs are expressed in detail. There is a problem that there is a limit.

In addition, recently, a method of forming various images on the dermal layer of leather by laminating a polyurethane film having a pattern having a saturation of 2 degrees or more to the skin of the leather (split leather) has been proposed (Patent Application 1999-0052856 and Patent application 1999-0052857).

The patent application No. 1999-0052856, a method of coating a polyurethane (polyurethane) after printing the image to be expressed in the leather on a release paper (attach) attached to the leather of the split (split leather), On a release paper colored to have a saturation of not less than saturation, a one-part polyurethane resin is applied after drying in a predetermined amount, two-component resin is applied on the surface thereof, and then semi-dried and attached to the dermis layer, which is aged for 8 to 12 hours or more. The present invention relates to a method of adding color to a polyurethane coated leather by peeling off the release paper and the leather.

In addition, the patent application No. 1999-0052857 is a method of bonding an image to be expressed in leather on a polyurethane wet film to bond with leather, the polyurethane film is a polyurethane resin is cured in water to continuously pore of a constant shape The film is formed to have a constant thickness, and the surface of the film is buffed using a buffing machine, and then a two-component coating solution is applied to the back side of the wet film, semi-dried using a dry chamber, and rolled by 8 kg. / cm ² , and after winding (winding) and aging for 8 to 14 hours in a aging room of 60 to 70 ℃, after applying a coating solution on the back of the wet film, and then coated with an adhesive polyurethane, After semi-drying and laminating with the dermis layer of the leather, it is pressed by a press, and also wound and matured in a aging chamber by coloring. It relates to a method for color.

However, since the method is usually intended for the leather of the leather (split leather) used for the production of low-cost leather products, it is not necessary to express various images on the full grain leather used for the production of expensive leather products. It can not be applied, and since it uses the rolling printing method, only a simple image having a color and saturation of about 2 to 5 degrees can be represented, and various colors and delicate designs cannot be expressed, and the manufacturing process is complicated and productivity is high. There is a problem that is poor.

Accordingly, the technical problem to be solved by the present invention is to solve the above problems, to provide a method for transferring a color image having a variety of colors on the surface of the leather by a simple process and a leather produced by the method.

The present invention to achieve the above technical problem,

(a) generating a color image having a plurality of colors on a computer screen;

(b) printing the image on a polysiloxane surface layer of a transfer sheet;

(c) cleaning the leather to which the image is to be transferred;

(d) heating and drying the leather to which the image is to be transferred;

(e) covering the transfer paper on the leather and applying heat and pressure such that the polysiloxane surface layer contacts the dried leather; And

(f) providing a method of transferring a color image to a surface of a leather comprising removing the transfer paper from the leather and cooling to room temperature.

Preferably, the plurality of colors is 3 to 11 colors.

Preferably, the transfer paper of step (b) is prepared by first coating a linear low density polyethylene resin on a base film and second surface coating of a polysiloxane surface layer on a linear low density polyethylene surface.

Preferably, the heating process of step (c) is performed for 20 to 60 seconds at 50 to 150 ℃.

Preferably, the heat and pressure of the step (d) is applied to a temperature of 100 to 200 ℃, at a pressure of 5 to 10 psi, for 10 to 60 seconds.

Preferably, it covers a pad for uniformly transmitting heat and pressure on the transfer paper of the step (e).

Preferably, the leather is a natural leather or artificial leather, more preferably, the natural leather is at least one selected from the group consisting of cow, sheep, pig, rabbit, kangaroo and horse leather, even more preferably The natural leather is a split leather or full grain leather of leather.

The present invention also provides a leather produced by the transfer method.

Hereinafter, the leather manufacturing method of the present invention will be described in more detail.

In the transfer method of the present invention, a task of first inputting various images to be transferred onto a transfer sheet on a computer is performed. There is no limit to the number of colors in the selected image, but it is preferred to have a color number of 3 to 11, preferably 3 to 10, most preferably 3 to 9.

After performing the image operation, the color difference between the image on the computer and the leather to be transferred is corrected so that the image on the computer and the image to be transferred have the closest color and shape. Since the color of the leather skin layer is not constant and there is a slight color difference, it is necessary to go through the steps of correcting the color of the image on the computer according to the color of the leather to which the image is transferred. For example, when the image to be transferred has a green color, when the image is transferred to a leather with a yellow color, the transferred image is less likely to have a desired vivid green color, and the image to be transferred is closer to blue. If the image is calibrated so that an image having a color close to the desired green color can be obtained, the leather is transferred.

The image which has undergone the color difference correction step is first coated with a linear low density polyethylene layer using a laser color printer or the like, and printed on a transfer paper made by second coating with a polysiloxane layer.

The transfer paper was first coated with a linear low density polyethylene (LLDP) resin on a base film, and a polysiloxane releasing agent (Dow Corning, product number SYL OFF 7430) on the linear low density polyethylene side. It is prepared by dissolving it with toluene solvent or aliphatic solvents such as hexane and heptane and then coating it with secondary coating. The produced transfer paper accurately expresses color and design when images of various colors and delicate designs are transferred onto the transfer paper, and the image is leather. It is precisely transferred to, and it has the characteristic of smooth release of transfer paper and leather after press work.

Meanwhile, the leather in which the image is to be expressed needs to be removed by cleaning with a leather cleaner or neutral detergent, and the reason for removing the foreign material is that foreign materials exist on the surface of the leather to which the image is transferred. In this case, there is a fear that the color change and imaging may not be performed on the site.

In addition, the leather in which the image is to be expressed is subjected to a process of heating to remove moisture. The heating process of the leather is carried out for 20 to 60 seconds, preferably at a temperature of 50 to 150 ℃, it is carried out by a Heat Press machine. The reason for removing moisture by heating the leather is the same as the foreign matter removal process, when heat and pressure are applied by presses or rollers, water vapor is generated due to the high temperature of the moisture. Because there is no fear.

Next, the transfer paper with the image transferred on the leather which has undergone the foreign matter and moisture removal step is attached, and the step of heating and pressurizing is performed. The temperature and pressure to be applied are applied at a temperature of 100 to 200 ° C. at a pressure of 5 to 10 psi using a device such as a heat press for 10 to 60 seconds, and when the temperature and pressure are lower than the above range, the surface of the leather There is a problem in that imaging is not performed, and if it is higher than the above range, there is a problem such as discoloration of the image.

In the transfer process, the temperature transmitted to the hot plate of the heat press varies slightly from site to site, so that a pad made of polysiloxane or the like may be covered on the transfer paper to evenly transfer and maintain the temperature of the hot plate to the transfer paper to be imaged. By using it, it is possible to solve the problem of discoloration and transfer of the transfer paper and the leather due to the temperature difference which may be caused when heat and pressure are directly applied to the transfer paper and the leather.

Finally, by removing the transfer paper from the leather subjected to the transfer process and cooling to room temperature, it is possible to produce leather with various color images transferred to the surface.

According to the present invention, a leather capable of transferring various images on a surface may be a natural leather or an artificial leather, and in the case of a natural leather, leather of animals such as cows, sheep, pigs, rabbits, kangaroos and horses may be used, and semi-finished products. Applicable to both leather fabric and finished leather products. In addition, the present invention can be applied to both the dermal layer and the skin layer of the leather, but when applied to the skin layer can produce a high-quality leather product with a sharper image transferred, it is more suitable for the skin layer.

The present invention also provides a leather produced by the above-described method.

Hereinafter, the present invention will be described in more detail with reference to examples of the present invention, but the present invention is not limited to the following examples.

<Example 1>

Leather using the chrome tanned cow crust leather was subjected to a transfer process for 30 seconds at a pressure of 5.5 psi at 150 ° C. with a heat press machine for 30 seconds to express the leather according to the present invention. Prepared. The manufactured leather was able to observe that the various color images to be expressed are clearly transferred to the surface of the leather, and the image was not easily peeled off from the surface of the leather, so that the durability or friction resistance was also excellent.

<Example 2>

Using a vegetable tanned cow crust leather, the leather according to the present invention was produced by transferring various color images on the surface through a transfer process for 35 seconds at a pressure of 6 psi at 160 ° C. using a heat press machine. It was. The manufactured leather was able to observe that the various color images to be expressed are clearly transferred to the surface of the leather, and the image was not easily peeled off from the surface of the leather, so that the durability or friction resistance was also excellent.

<Example 3>

Using finished cow leather (cow finished white leather), a leather press according to the present invention was produced by the transfer process for 35 seconds at a pressure of 6.5psi at 165 ℃ with a heat press machine to express various digital color images on the surface. The manufactured leather was able to observe that the various color images to be expressed are clearly transferred to the surface of the leather, and the image was not easily peeled off from the surface of the leather, so that the durability or friction resistance was also excellent.

The leather and its manufacturing method according to the present invention can express the gradation of various images and colors of all colors without limiting the color power as compared to the conventional method, and the durability is strong and the colored surface is easily peeled off. It provides a leather that is not resistant, and in particular, it is effective to image various colors and delicate designs directly on the skin layer of the leather, which is a fabric of high-quality leather products, and can be applied to various leather products.

Therefore, the method according to the present invention can be applied to clothing, fashion accessories, various accessories, etc., instead of leather products having a conventional color surface where the field of use is limited to military articles, shoes, etc. due to the simplicity of the design and the expression color. There is an effect that it can provide a new leather product that can be widely used.

1 and 2 is a plan view of the leather produced by the present invention,

3 is a cross-sectional view of the leather produced by the present invention.

<Description of Main Parts of Drawing>

1: decal image

2: skin layer

Claims (10)

(a) generating a color image having a plurality of colors on a computer screen; (b) printing the image on a polysiloxane surface layer of a transfer sheet; (c) cleaning the leather to which the image is to be transferred; (d) heating and drying the leather to which the image is to be transferred; (e) covering the transfer paper on the leather and applying heat and pressure such that the polysiloxane surface layer contacts the dried leather; And (f) removing the transfer paper from the leather and cooling to room temperature. The method of claim 1, wherein the plurality of colors is 3 to 11. The transfer method of claim 1, wherein the transfer paper of step (b) is prepared by first coating a linear low density polyethylene resin on a base film and second coating of a polysiloxane surface layer on a linear low density polyethylene surface. The method of claim 1, wherein the heating step (c) is carried out at 50 to 150 ° C for 20 to 60 seconds. The transfer method according to claim 1, wherein the heat and pressure of step (d) are applied at a temperature of 100 to 200 ° C. at a pressure of 5 to 10 psi for 10 to 60 seconds. The transfer method according to claim 1, further comprising a pad for uniformly transferring heat and pressure on the transfer paper of step (e). The method of claim 1, wherein the leather is a natural leather or artificial leather. The method of claim 7, wherein the natural leather is at least one selected from the group consisting of cow, sheep, pig, rabbit, kangaroo and horse leather. 9. The method of claim 8, wherein the natural leather is a split leather or full grain leather of the leather. Leather manufactured by the method of Claims 1-9.