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Non-chroming processing method for leather production

A processing method and chrome-free tanning technology, which can be used in leather impregnation, leather manufacturing, small raw hides/large raw hides/leather/fur processing, etc. It can solve problems such as chrome tanned leather pollution, reduce production consumption materials, and reduce production operations. Cost, high humidity and heat stability effect

Inactive Publication Date: 2008-07-30
湖南省怀其皮革集团制革有限公司
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  • Claims
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AI Technical Summary

Problems solved by technology

However, due to the pollution of chrome tanned leather to the environment, it is found that trivalent chromium in leather is easily oxidized into hexavalent chromium, and hexavalent chromium has carcinogenic properties.

Method used

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  • Non-chroming processing method for leather production
  • Non-chroming processing method for leather production

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Embodiment Construction

[0019] The concrete steps of a kind of chrome-free tanning process method for leather production of the present invention are as follows:

[0020] 1. Batching of raw hides

[0021] Raw hides must be produced in strict batches according to the differences, such as size, thickness, disability, and color of pig hair, so as to lay a good foundation for solving the problem of parts and the smooth progress of subsequent operations. After batching, the raw hides are mechanically de-fleshed once, which can not only remove part of the subcutaneous tissue fat, but also remove part of the salt, which is convenient for soaking in water and degreasing. Weigh after removing the flesh.

[0022] 2. Soak in water, degrease

[0023] The quality of degreasing directly affects the quality of finished leather. If the grease is not removed cleanly, it will seriously affect the penetration of acid-base, phosphorus salt and other chemical materials. Therefore, a combination of multi-stage degreasi...

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Abstract

The invention relates to a chrome-free tanning method of producing the leather, which is characterized in that, the processing method includes the following steps: organizing the material, dipping in water, degreasing; dehairing by dipping in lime-sulfide, removing the lime-sulfide, rolling in saltpeter, cutting the leather, softening, dipping in acid, removing the acid, tanning, re-tanning, neutralizing, treating by fat, washing the leather by water and finally obtaining the finished product. The technique of the invention is reasonable; the leather after tanning has high muggy stability, better tolerance in acid, alkali etc. After some other treatments, the physical property, hand feeling and appearance improve a lot, and the leather becomes flat, soft, plump and elastic. The operating parameters of the corresponding technique in the production process are optimized; the technique is simplified; the material consumption for production is reduced; the production operating cost is reduced; and the product quality is increased.

Description

technical field [0001] The invention relates to a leather processing technology, in particular to a chrome-free tanning processing method for leather production. Background technique [0002] The key to tanning is the tanning effect. Because the chrome tanning agent has good tanning properties, it is the most basic chemical denaturation process for turning raw hide into leather, and it makes the perishable raw hide not easy to rot. The tanned leather has high moisture and heat stability and is more resistant to chemical agents such as acids and alkalis. However, due to the pollution of chrome-tanned leather to the environment, it is found that trivalent chromium in leather is easily oxidized into hexavalent chromium, and hexavalent chromium has carcinogenicity. Therefore, due to environmental requirements and the needs of human health, more chrome-free tanned leather should be used in the production of leather. Contents of the invention [0003] The object of the present...

Claims

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Application Information

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IPC IPC(8): C14C3/00C14C9/02C14B1/00
Inventor 朱强
Owner 湖南省怀其皮革集团制革有限公司
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