Manufacturing method of tanned shrunk grain top layer leather

A production method and technology of top layer leather, which is applied in the field of vegetable tanned shrinkage top layer leather, can solve the problems of difficult and complete detanning, limited application range, single appearance of leather, etc., and achieve a unique appearance effect

Active Publication Date: 2015-07-08
FENGAN LEATHER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This type of process is generally difficult to completely detann, and the appearance of the leather produced by this type of process is single, and the scope of use is limited

Method used

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Embodiment Construction

[0017] The present invention will be further described below in conjunction with specific embodiments.

[0018] The preparation method of the vegetable tanned shrinkage top layer leather provided by the present embodiment comprises the following steps:

[0019] S1: Washing with water, prepare the original top-grain leather embryo with relatively finer texture and fewer scars as the embryo. Put the above-mentioned skin embryos into the drum machine, and add warm water accounting for 60%-80% of the total capacity of the drum machine to the drum machine to clean the skin embryos. The temperature of the warm water is preferably 30°C. The weight of the skin embryo put into the drum machine can be determined according to the actual situation.

[0020] S2: Degreasing, adding salt with a quality of 4%-6.0% of the quality of the drum machine endothelial embryo, oxalic acid with a quality of 4%-6.0% of the quality of the drum machine endothelial embryo and the quality of the drum machi...

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Abstract

The invention provides a manufacturing method of tanned shrunk grain top layer leather. In the method, crust leather is successively subjected to following processes: degreasing, re-tanning, neutralization, filling, dyeing, fat-liquoring, stacking, vibration-softening, leather grinding, painting-decoration and roll-burnishing. In the re-tanning process, by means of addition of sodium carbonate, the pH value of liquid in a drum machine is regulated to be 8-10 and meanwhile the temperature of the liquid is adjusted to be 33-35 DEG C, and then the crust leather is added with a shrunk grain agent to generate patterns on the crust leather, and finally when the processes are finished, the liquid in the drum machine is drained completely. In the invention, the shrunk grain agent is added at special pH value and temperature for generate bull-shoulder pattern on the crust leather, so that the tanned shrunk grain top layer leather is unique in appearance and is wider in available range when compared with a tanned leather prepared through a conventional technology. Meanwhile, by means of addition of a tannin extract in a special manner and at a special proportion during the filling process, the bull-shoulder pattern on the crust leather can be shaped to form a pattern shrinking effect.

Description

technical field [0001] The invention relates to a method for making leather, in particular to a method for making vegetable tanned shrinkage top layer leather. Background technique [0002] Vegetable tanned leather is a kind of environmentally friendly natural cowhide, commonly known as tree cream leather, which is a kind of cowhide without any coating, trimming or chemical coloring. Detanning is the most critical link in the production of vegetable tanned leather. After detanning, the structure of raw hide undergoes qualitative changes and becomes valuable leather. Therefore, whether detanning is thorough directly determines the quality of vegetable tanned leather. [0003] In the traditional production process, formic acid or oxalic acid is generally used for detanning. After adding acid, the hydrolysis of blue alum is inhibited, thereby reducing its tanning property. At the same time, the hydrogen ions in the solution replace the carboxyl groups, so that the blue alum and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C14C3/28C14C3/30C14C1/08C14C13/00D06P1/00
CPCC14C1/08C14C3/28C14C3/30C14C13/00D06P1/00
Inventor 杨宏建陈群雄陈福来吴境煌刘仁品
Owner FENGAN LEATHER
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