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Technique for preparing lining leather of pigskin shoes

A technology for manufacturing crafts and leather shoes, which is applied in the field of pigskin shoe lining leather, and can solve problems such as excessive Cr(VI content)

Inactive Publication Date: 2008-01-09
ZHEJIANG FAREAST LEATHER INDAL
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  • Summary
  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

[0004] In order to solve the problem that the content of Cr(VI) in the inner leather products of pigskin shoes in my country exceeds the standard, the present invention provides a manufacturing process capable of controlling the content of chromium in the inner leather products of pigskin shoes. The content of Cr(VI) in the product is not higher than the current national standard, that is, less than 3mg / kg leather

Method used

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Examples

Experimental program
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Embodiment Construction

[0015] An example is provided below to illustrate the specific operations of the main stages of the manufacturing process of the pigskin shoe lining leather of the present invention:

[0016] (1) Industrial raw material processing: this stage mainly includes weighing the raw material skins, a presoaking (removal of salt, dirt, stretched leather fibers), a presoaking, meat removal, main water soaking, expansion, depilation, etc. Security thickness classification, primer, etc.;

[0017] (2), bag ash alkali;

[0018] (3) Dehydration;

[0019] (4) Softening;

[0020] (5) Pickling acid;

[0021] (6) Mix sawdust into the drum;

[0022] (7), cut evenly;

[0023] (8) Wash with water;

[0024] (9) Deacidification;

[0025] (10) Tanning; the specific operation in the tanning stage is: adding 7-7.5% of chromium powder, adding in two times, first 4%, then 3.5%, with an interval of 30 minutes; after tanning, add baking soda 1.5%, 15min, X4, 90min, measure the pH value at 4-4.1, increase the te...

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Abstract

A process is concerned with controlling content of Cr(VI) in leathers of shoes, carrying out by: controlling temperature, duration and pH value in tanning, neutralizing, dyeing, re-tanning, and oiling; selecting all materials with less content of Cr(VI); and controlling temperature, water content, moisture and light radiation in finishing, storing and transporting to avoid Cr(III) converting into Cr(VI), so that content of Cr(VI) can be controlled less than 2.5 mg / kg.

Description

Technical field [0001] The invention relates to a manufacturing process of pigskin shoe lining leather, in particular to a manufacturing process capable of controlling the content of hexavalent chromium in pigskin shoe lining leather products. Background technique [0002] Pigskin shoe lining leather is an indispensable accessory product for the footwear industry. Among them, the content of hexavalent chromium (Cr(VI)) is an important technical indicator of pigskin shoe lining leather products, which directly affects the quality and use safety of pigskin shoe lining leather. If the content of Cr(VI) is too high, it will be toxic to the human body, especially the parts in direct contact with the human body. Therefore, all countries in the world have strict regulations on imported leather and products. The 1994 European Standard stipulates that the maximum limit of Cr(VI) in glove leather is 3mg / kg leather; the 1997 draft of the European Eco-label stipulates that shoes The maximum ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C14C3/00C14C9/02D06P3/32
Inventor 王楚
Owner ZHEJIANG FAREAST LEATHER INDAL
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