An enzymatic hair removal method for eliminating grain damage of cowhide leather

A cowhide and leather technology, which is applied in the treatment of small raw hide/big raw hide/leather/fur, chemical treatment of small raw hide/large raw hide/leather skin/fur, and application. The effect of shortening the time, improving the efficiency and reducing the dosage

Active Publication Date: 2017-05-03
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method can not only overcome defects such as grain damage and loose surface of cowhide that are easily caused by the existing enzymatic high-temperature hair removal process, but also ensure the enzyme activity of casein hydrolytic enzymes in a suitable temperature range, greatly shortening the treatment time of enzymatic hair removal, The efficiency is greatly improved to be suitable for industrial production and application

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] (1) Soaking in water: First add 0.3% sodium carbonate and 0.5% JFC penetrating agent to 250% water to form a solution by adding sodium chloride salted yellow cowhide skin weight, then put it into a drum and salt it with sodium chloride Store the yellow cowhide and turn it at a low speed for 1 hour, and then turn it for 5 minutes every hour, a total of four times, and then let it stand for 10 hours to make the skin full of water to the state of fresh skin; (2) Remove the flesh: remove the dirt on the surface of the hide and (3) Enzyme depilation: In the tannery drum with the bath liquid circulation filter device, 0.5% sodium gallate of the tare weight will be added to 200% water of the tare weight, and the pH value will be adjusted to 8.5 with sodium carbonate , rotating pretreatment at 38°C for 30 minutes, then adding AS1.398 depilatory enzyme with an amount of 150 international units / g skin, and rotating at low speed for 8 hours; (4) Mechanical hair removal: push with a...

Embodiment 2

[0030] Because soaking, fleshing, mechanical dehairing and subsequent liming, deliming, softening, pickling, and tanning procedures are the same as in Example 1, they are omitted here. What is different from Example 1 is: (3) enzyme depilation is in the tannery drum that has bath liquid circulating filter device, will add 1.0% sodium adipate of tare to the water of 300% of tare, use Sodium carbonate adjusts the pH value to 11.5, rotates the pretreatment at 42°C for 60 minutes, then adds 209 depilatory enzyme with an amount of 300 international units / g hide, and rotates at a low speed for 3 hours; the raw material used is sodium chloride salted stored buffalo hide .

[0031] The obtained enzymatically dehaired buffalo leather has a complete grain surface without damage, clear pores and no loose surface.

Embodiment 3

[0033] Because soaking, fleshing, mechanical dehairing and subsequent liming, deliming, softening, pickling, and tanning procedures are the same as in Example 1, they are omitted here. What is different from Example 1 is: (3) enzyme depilation is in the tannery drum that has bath fluid circulation filter device, will join 0.1% sodium malonate of tare weight in the water of 150% of tare weight, use Sodium carbonate adjusts the pH value to 7.5, rotates at 35°C for 45 minutes, then adds 166 depilatory enzyme with an amount of 100 international units / g hide, and rotates at a low speed for 9 hours; the raw material used is sodium chloride salted and stored yellow cowhide .

[0034] The obtained enzymatically dehaired yellow cowhide has a complete grain surface without damage, clear pores, and a non-loose surface.

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PUM

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Abstract

The invention discloses an enzyme unhairing method for removing damage to a cowhide leather grain surface. The enzyme unhairing method is characterized in that at 35-42 DEG C, at first, a collagenase inhibitor of which the tare is 0.1-1.0% is used for pre-processing cowhide subjected to soaking and meat removal under the condition that the pH value is 7.5-11.5, then an unhairing enzyme preparation is added by routine to carry out unhairing treatment for 3-9 hours, and the follow-up processes such as mechanical unhairing, liming, deliming, softening, picking and tanning are performed by routine. The cowhide is pre-processed by the collagenase inhibitor before the operation of enzyme unhairing is performed, so that on one hand, collagenase in unhairing enzyme components is inhibited, the safety implementation of enzyme unhairing at a relatively high temperature is ensured, the enzyme unhairing time is greatly shortened, the efficiency is greatly improved, and the suitability for industrial production and application is achieved, on the other hand, the collagenase inhibitor has little impact on the activity of casease in the unhairing enzyme preparation, so that efficient unhairing efficiency is remained, the obtained leather grain surface is intact and undamaged, pores are clear, and the probability of surface looseness is low.

Description

technical field [0001] The invention belongs to the technical field of cowhide dehairing processing and manufacturing, and in particular relates to an enzyme dehairing method for eliminating grain surface damage of cowhide leather. Background technique [0002] The leather industry has become a light industry with rapid technological progress and development in the national economy, and it is also one of the industrial sectors that is most closely related to the national living standard and quality. In the tanning process, the hair removal process is the main source of pollution, among which lime, sulfide, and pilin dissolved in the hair removal solution are important sources of pollution in the traditional hair removal and hair removal technology. The pollution of this process accounts for 50-60% of the total pollution of tanning, including sulfide, chemical oxygen demand (COD), biochemical oxygen demand (BOD) 5 ), total dissolved solids (TDS) and total suspended solids (T...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C14C1/06
CPCC14C1/065
Inventor 程海明江明芳许晓红陈敏李志强
Owner SICHUAN UNIV
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