KR900003535B1 - Method for embossing color design on natural leather - Google Patents

Abstract

A method for embossing color design on a natural leather comprises the steps of; (A) coating an oil paint soln. (I) onto a surface of polyproplyene resin and drying ; (B) introducing the resin whose coating faces toward an upper face of leather between an uneven underface of the moulding appt., and then heatingpressing at 100-120≰C, 800 Kg/Cm2 pressure for 1 min. to form color design onto depressed face of the leather, and removing the 99 resin, then doing a polyurethane coating. (I) comprises 100:5:5 of isopropyl alcohol, butyl collulove, the mixt. which is a mixt. soln. of methyethyl ketone and an oily paint (germany ZAPON) of the ratio 9:1.

Description

Method of forming uneven part color pattern on natural leather

1 is an exemplary view of applying an oily pigment solution to the P.P resin in the first step.

2 (a), 2 (b) and 2 (c) are cross-sectional views of an uneven forming and color electrodeposition process.

* Explanation of symbols for main parts of the drawings

1: Oily pigment solution 2: P.P resin

3: leather 3 ': main part

4: molding machine.

The present invention relates to a method of forming a collar pattern on an uneven portion simultaneously with embossing on a natural leather surface.

In order to emboss the conventional leather surface and to make a color pattern on the uneven surface, first emboss the leather surface and apply a pigment spray to wipe the surface other than the recessed part, which consumes pigment and chemicals, and the surface of the leather is cleaned by wiping. It was damaged, it took a long time and the pattern was irregular. In addition, there is a method of preliminary printing by screen printing on the leather surface and molding according to the pattern shape. However, this also makes it difficult to match the pattern shape printed on the molding machine and the leather surface.

The present invention has been made to solve such a conventional pedan, it is an object of the present invention to provide a method for forming the embossed and the pattern of the uneven part in a single molding operation.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

The first step is to apply an oil pigment solution on a PP (polypropylene) resin. The oil pigment solution is dissolved in methyl ethyl ketone in a ratio of 9: 1 by oil pigment (ZAPON made in Germany). The solution is a mixture of isopropyl alchol (lsopropyl Alchol) and butyl cerosol (Buthyl Cellosolve) in a ratio of 100: 5: 5.

Here, isopropyl alcohol acts as an ionizing agent, which acts as a deteriorating agent when peeled after applying heat and pressure to the oil-based P.P resin on the leather surface, which is the next process, and the butyl serosol portion serves as a retarder.

This oily pigment mixture solution is applied to only one side of the P.P resin and completely dried.

In the embodiment, the coating of the oil pigment is carried out by installing a close roller 7 in the inside of the barrel 6 containing the oil pigment solution 1, as shown in FIG. After wetting the oil pigment solution and passing through the contact rollers, the film was squeezed thinly on both sides to squeeze one edge or both edges, and then the double-ply PP resin was stretched to obtain a state in which the oil pigment solution was applied thinly on only one side.

The second step is embossing of the upper surface of the leather and the process of forming the uneven surface collar pattern. The PP resin is interposed between the uneven surface of the molding machine and the leather, and the surface coated with the oil pigment solution is directed toward the leather upper surface. When heated and pressed for 1 minute at -200 ℃ and 800kg / cm ² of holding pressure, the uneven part and the collar pattern are electrodeposited on the leather surface at the same time. Subsequently, the PP resin is removed from the leather surface.

This process is shown in cross section in FIG.

FIG. 2 (a) shows the oily pigment solution layer 1 facing the leather surface 3 through the PP resin 2 on the molding machine 4 and the leather surface 3 as a state before embossing. .

FIG. 2 (b) shows that the molding machine 4 is press-bonded to the leather surface 3 for 1 minute in the embossing state at the above-described temperature and pressure, but only the bottom iron surface 4 'of the molding machine is pressed. Touch the recessed part 3 'of the leather surface and leave some gaps. At this time, the oily pigment solution of the bottom of P.P resin is electrodeposited on the recessed part of leather surface.

FIG. 2 (c) shows a state after processing, and when the P.P resin 2 is removed, the oily pigment solution 1 is electrodeposited only on the main portion of the leather surface.

Therefore, according to the pattern of the bottom uneven portion of the molding machine is a variety of color patterns are formed on the uneven portion on the leather surface, the product is obtained by performing a polyurethane coating to protect the color pattern.

As described above, the present invention is embossed and the color pattern is formed on the leather surface only in one process (second process), so that the working time can be greatly shortened and various and sophisticated color patterns can be formed.

Claims (1)

Method of forming the uneven portion collar pattern on the natural leather surface is completed by the following process combination. Step 1: Dissolve an oil pigment (ZAPON made in Germany) at a ratio of 9: 1 in methyl ethyl ketone, and isopropyl alchol and butyl serosolve in this solution. A process of thinly applying and drying an oily pigment solution obtained by mixing at a ratio of 5: 5 to one side of a PP (polypuropylene) resin. 2nd process: The resin coated surface is placed between the bottom of the molding machine and the uneven surface and the leather surface, and the surface coated with the oily pigment solution is faced to the leather upper surface and heated and pressed for 1 minute at a molding temperature of 100-120 ° C. and a molding pressure of 800 kg / cm ² . The process of electrodepositing the collar pattern on the leather main part, removing the PP resin, and then polyurethane coating.

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