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Method for manufacturing leather

A technology for leather and raw hides, applied in small raw hides/large raw hides/leather/fur treatment, small raw hides/large raw hides/leather hides/fur chemical treatment, chemical treatment before tanning, etc. It can solve problems such as less application.

Inactive Publication Date: 2014-12-24
潘龙祥
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the depilation methods used on a large scale in yellow leather tanning mainly include: liming (alkali) depilation, liming (alkali) hair preservation and depilation, while rolling enzyme stacking dehairing and oxidation depilation are less used

Method used

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Examples

Experimental program
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Embodiment Construction

[0008] The present invention will be further described below by specific examples.

[0009] In the process of lime-alkali dehairing, the swelling degree of raw hide mainly depends on the amount of lime and sodium sulfide. The greater the amount of ash and alkali used, the more severe the swelling of the raw hide and the greater the possibility of becoming a leather loose surface. On the other hand, the greater the amount of ash and alkali used, the easier the hair removal, and the greater the pollution of the ash and alkali to the environment. The author has used system engineering and orthogonal design method to carry out a more systematic research on ash-alkali hair removal, put forward "leather ash-alkali hair removal method", and obtained the finalization process as follows.

[0010] Technical regulations: liquid ratio 0.3~0.5, temperature 22℃~24℃, flaky sodium sulfide (60%) 2.0%~2.2%, lime fine powder 4%, penetrant JFC 0.2%, liquid caustic soda (30%) 0.6 %~0.8%.

[001...

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Abstract

The invention provides a method for manufacturing leather, and belongs to the technical field of leather processing. The method for manufacturing leather comprises a raw hide liming step and a raw hide re-liming step, wherein waste liquor produced in the raw hide limiting step and the raw hide re-liming step enter a same storage tank. According to the method for manufacturing the leather, raw hide with hairs firstly enter a liming bath (new lime) and then enter a re-liming bath (old lime) after hairs are removed by virtue of a modified less-bath lime-soda process, wherein the difference is that the re-liming action is strengthened. And thus, hide collagen fibers can be sufficiently and properly separated and loosened really. In both liming bath and re-liming bath, waste liquor enters the same storage tank, and the improved new system utilizes the advantages of a liming and re-liming waste liquor recycling technology. And meanwhile, more importantly, the recycling of the liming and re-liming waste liquor is realized by virtue of the combination and linkage, and thus, the pollution of limes and sodium sulfide on environment is radically removed.

Description

[0001] technical field [0002] The invention belongs to the technical field of leather processing, in particular to a method for making leather. Background technique [0003] At present, the methods of depilation that are widely used in yellow leather tanning mainly include: liming (alkali) dehairing, liming (alkali) hair-preserving and depilating, while enzymatic stacking dehairing and oxidation dehairing are less used. There is a saying in the tanning industry that "good skins come from the ash tank". Modern tanning technology believes that preparation is the foundation and the key. In the preparation section of yellow leather tanning, lime alkali treatment is very important. [0004] The technological principles of modern liming can be summarized as: less bathing for depilation, inhibition of expansion, light alkali and heavy ash, uniform and moderate. Good liming should be based on the uniform absorption of alkali at all levels in the raw hide, and then gradually incr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C14C1/06
Inventor 潘龙祥
Owner 潘龙祥
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