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Animal fur clean depilation and fur fiber loosing method for preparing leather and application thereof

A technology of animal skin and skin fiber, applied in application, small raw hide/large raw hide/leather skin/fur chemical treatment, small raw hide/large raw hide/leather/fur treatment, etc., can solve the void and grain damage of finished leather , unclean hair removal, environmental pollution and other problems, to achieve the effect of increased leather yield, reduced emissions, and high softness

Active Publication Date: 2008-08-06
SICHUAN UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a kind of soda-sulfide-free, lime-free animal skin depilation and hide fiber loosening method for the deficiencies in the prior art, to solve the environment caused by the traditional liming depilation and hide fiber loosening process soda sulfide and lime Pollution, and the use of a single enzyme for hair removal and loose leather fibers can easily cause problems such as unclean hair removal, empty leather and grain damage

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Embodiment 1-sofa leather yellow cowhide without alkali sulfide, without lime depilation and leather fiber dispersion

[0026] (1) Complex enzyme soaking in water

[0027] 100kg of salt wet skin of yellow cattle, after washing, pre-soaking and removing meat, add to the drum, add 200kg of water, adjust the temperature to about 22°C, add 0.5kg of soda ash, Nowolase SG (an alkaline protease, Chengdu Zhanxiang Technology Industry Co., Ltd. company) 0.4kg, Nowolase DG (a kind of alkaline lipase, Chengdu Zhanxiang Technology Industrial Co., Ltd.) 0.2kg, glucoamylase 0.1kg, after rotating for 60 minutes, add osmotic agent JFC 0.2kg, fungicide 0.2kg, rotate 60 minutes, interval rotation, rotation 5 minutes per hour, the total immersion time is about 22 hours.

[0028] (2) Complex enzyme hair removal and enzyme fiber loosening

[0029]Add 100kg of yellow cowhide soaked in water to the drum, add 100kg of water, adjust the temperature to about 25°C, adjust the pH value of the hi...

Embodiment 2

[0033] Embodiment 2-Shoe upper leather yellow cowhide without alkali vulcanization, without lime depilation and leather fiber dispersion

[0034] (1) Complex enzyme soaking in water

[0035] 100kg of wet salted hide of yellow cattle, after washing, pre-soaking and removing meat, add to the drum, add 200kg of water, adjust the temperature to about 22°C, add 0.3kg of soda ash, Nowolase SG (an alkaline protease, Chengdu Zhanxiang Technology Industry Co., Ltd. company) 0.2kg, Nowolase DG (a kind of alkaline lipase, Chengdu Zhanxiang Technology Industrial Co., Ltd.) 0.2kg, glucoamylase 0.1kg, after rotating for 60 minutes, add osmotic agent JFC 0.3kg, fungicide 0.2kg, rotate 30 minutes, interval rotation, rotation 5 minutes per hour, the total immersion time is about 18 hours.

[0036] (2) Hair removal, soaking in alkali

[0037] Add 100kg of yellow cowhide after compound enzyme soaking treatment to the drum, add 50kg of water, adjust the temperature to about 22°C, add 0.15kg of ...

Embodiment 3

[0039] Example 3 Garment leather goat skin without alkali sulfide, without lime depilation and leather fiber dispersion

[0040] (1) Complex enzyme soaking in water

[0041] Goat salt wet skin 100kg, after washing, pre-soaking and de-fleshing, add to the drum, add 250kg of water, adjust the temperature to about 25°C, add 0.2kg of soda ash, Dowellzyme SD (an alkaline protease, Sichuan Dawei Technology Industry Co., Ltd. company) 0.3kg, Dowellzyme HK (an alkaline lipase, Sichuan Dawei Technology Industrial Co., Ltd.) 0.1kg, amylase 0.05kg, after rotating for 40 minutes, add osmotic agent JFC 0.2kg, fungicide 0.1kg, rotate 40 minutes, interval rotation, rotation 5 minutes per hour, the total immersion time is about 16 hours.

[0042] (2) Complex enzyme treatment

[0043] Add 100kg of goatskin soaked in water to the drum, add 80kg of water, adjust the temperature to about 30°C, adjust the pH value of the skin to 8-10, add 0.1kg of 2709 protease, Nowolase DG (an alkaline lipase, ...

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PUM

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Abstract

The invention provides a method for unhairing leather and loosening leather fiber without sodium sulfide and lime in a leather production process and the application of the method. The method is characterized in that a method for combining unhairing by non-sulfur (sodium sulfide) depilatory under the alkaline condition and enzyme fiber loosening under the under the non-lime (lime) alkaline swelling condition are adopted, the enzyme unhearing and the enzyme fiber loosening take protease, lipase, amylase and glucoamylase as a compound enzyme system. The method achieves the effects for unhairing and loosening the leather fiber through adopting the method for combining compound enzyme water immersion, compound enzyme unhairing, unhairing with sodium sulfide depilatory, expansion regulator-sodium hydroxide expansion and the enzyme unhairing under the alkaline condition and eliminates the pollution which is brought by the sodium sulfide and the lime in animal unhairing or leather fiber loosening procedures in the leather production process. The method of the invention is suitable for unhairing and leather fiber dispersed processing of various animal leather of leather with various usages.

Description

1. Technical field [0001] The invention relates to a processing technology of animal skins in the tanning production process, in particular to a method for depilating animal skins and loosening skin fibers in the tanning production process. The method of the invention does not use soda sulfide and lime at all, belongs to the field of leather cleaning production, and is suitable for depilation of animal skins and dispersion of hide fibers in various leather production processes. 2. Background technology [0002] At present, in the tanning production process, the removal of hair and the loosening of leather fibers are mainly completed through the liming process with alkali sulfide (sodium sulfide and sodium hydrogen sulfide) and lime as the main materials, that is, the raw leather is treated with lime and alkali sulfide. To achieve the purpose of hair removal and leather fiber dispersion. Due to the high depilation efficiency of alkali sulfide (including sodium sulfide and so...

Claims

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Application Information

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IPC IPC(8): C14C1/06C12S7/00
Inventor 彭必雨严建林石碧
Owner SICHUAN UNIV
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