Clean tanning hair removal expansion method

A clean and preparation technology, applied in the field of clean tanning, hair removal and expansion, can solve the problems of large enzyme dosage, high temperature and long time, and achieve the effect of simple operation, good elasticity and low cost

Inactive Publication Date: 2012-02-08
LONGCHANG YANGZHOU LEATHER MAKING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It avoids quality defects such as rotten surface and loose surface caused by the existing enzyme hair removal technology due to large amount of enzyme, long time, high temperature or excessive mechanical action

Method used

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  • Clean tanning hair removal expansion method

Examples

Experimental program
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Effect test

Embodiment 1

[0022] Embodiment 1: buffalo mat leather process

[0023] (1) Soak in water Put 100 parts of salted skin into the drum, add 150 parts of water, rotate for 60 minutes, drain, add 200 parts of water, adjust the temperature to 30°C, add 0.3 part of penetrant JFC, 0.5 part of Desaijing DF, 0.2 part of soda ash , 0.2 parts of Desaibei DB, 0.1 parts of Desaijing KL, turn for 60 minutes, stop for 60 minutes; turn for 5 minutes, stop for 50 minutes, a total of 10 times, add mixed enzyme preparation 20 activity units / gram skin, diisopropanol 0.4 parts of amine, 0.3 parts of triisopropanolamine, turn for 30 minutes, stop for 60 minutes; then turn for 5 minutes per hour, a total of 10 times, control the water, wash out the drum; remove the flesh and hair;

[0024] (2) Alkali expansion Put the above-mentioned de-fleshed and hair-removed skin into the drum, add 30 parts of water, add 0.2 parts of sodium sulfide, 0.3 parts of sodium hydrogen sulfide, 0.4 parts of NaOH, 0.5 parts of lime pow...

Embodiment 2

[0025] Example 2: Yellow cow sofa and bag leather process

[0026] (1) Put 100 parts of soaked salt skin into the drum, add 180 parts of water, rotate for 30 minutes, drain, add 250 parts of water, adjust the temperature to 25 ° C, add 0.2 parts of penetrant JFC, 0.3 parts of Dawei Lite DG-A, 0.4 parts of soda ash 0.4 parts of Desabei DB, 0.4 parts of Dawei Lite MT, turn for 45 minutes, stop for 60 minutes; turn for 1 minute, stop for 55 minutes, a total of 6 times, add mixed enzyme preparation 30 activity units / gpi, diisopropyl 0.1 part of alcoholamine, 0.5 part of triisopropanolamine, turn for 30 minutes, stop for 60 minutes; then turn for 2 minutes per hour, a total of 6 times, control the water, wash the drum, remove the flesh and hair;

[0027] (2) Alkali expansion Put the above-mentioned fleshed and dehaired skin into the drum, add 50 parts of water, control the temperature at 18°C, add 0.3 parts of sodium hydrosulfide, 0.2 parts of NaOH, 2.0 parts of lime powder, 1.0 pa...

Embodiment 3

[0028] Embodiment 3: buffalo outfit leather technology

[0029] (1) Put 100 parts of soaked salted leather into the drum, add 200 parts of water, rotate for 50 minutes, drain, add 230 parts of water, adjust the temperature to 20 °C, add 0.1 part of penetrant JFC, 0.2 part of DG-B, 0.3 part of soda ash 0.35 parts of Daweizimu SD, 0.3 parts of Dawei Lite FMN, turn for 50 minutes, stop for 60 minutes; turn for 2 minutes, stop for 50 minutes, a total of 8 times, add mixed enzyme preparation 60 activity units / gram skin, 0.3 parts of propanolamine, turn on for 60 minutes, stop for 60 minutes, then turn for 1 minute per hour, a total of 4 times, control the water, wash out the drum, remove the flesh and hair;

[0030] (2) Alkali expansion Put the above-mentioned skin after de-fleshing and hair removal into the drum, add 45 parts of water, add 0.3 parts of NaOH, 1.5 parts of lime powder, 1.2 parts of Desaijing POU, add 170 parts of water, and rotate for 40 minutes. NaOH 0.7 part, Des...

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PUM

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Abstract

The invention discloses a clean tanning hair removal expansion method. The method is characterized by comprising the following steps of: loosening hair roots while raw leather is immersed in water and softened under the synergistic action of various proteases; making hairs on the leather fall under the action of a fleshing machine during the fleshing of the conventional machine; and uniformly andappropriately loosening leather fibers under the actions of alkali and enzyme. The method is suitable for pollution-free production of hair removal expansion in the process of tanning cow leather. Bythe method, the defects of high content of suspended matters, chemical oxygen demand (COD) and biochemical oxygen demand (BOD) in waste liquor, heavy pollution and the like due to high using amount of sodium sulphide and lime in a barilla hair removal process are overcome, and the problems of uncompleted hair removal, damages to leather grain surfaces, loose surfaces and the like in the conventional enzyme hair removal process are solved.

Description

technical field [0001] The invention relates to a clean tanning depilation expansion method, which is suitable for depilation expansion in cowhide tanning and belongs to the field of leather manufacturing. Background technique [0002] The leather industry is closely related to my country's economic construction and people's daily life. Leather manufacturing is the source of the leather industry and occupies a very important position in the entire industrial chain. The growing demand has an irreplaceable position, so the development of my country's leather industry always follows the pace of my country's economic development. However, the development of my country's leather industry has been greatly hindered by environmental problems. In leather processing, except for double-sided leather that does not need depilation, there is almost a depilation and expansion process. At present, most tanneries still use the traditional lime and sulfurized alkali depilation and expansion t...

Claims

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Application Information

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IPC IPC(8): C14C1/06C14C1/04C14B1/02C12S7/00
Inventor 肖阳洲王坤余
Owner LONGCHANG YANGZHOU LEATHER MAKING
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