Method for producing parchment by using compound enzyme preparation

A composite enzyme preparation, parchment technology, applied in application, leather drying, small raw hide/large raw hide/leather/fur treatment, etc., to achieve high-efficiency substrate specificity, good writing performance and water resistance, smooth grain surface Effect

Active Publication Date: 2021-08-03
QILU UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the current process of producing parchment paper, there is no precedent for using enzyme preparations for hair removal

Method used

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  • Method for producing parchment by using compound enzyme preparation
  • Method for producing parchment by using compound enzyme preparation
  • Method for producing parchment by using compound enzyme preparation

Examples

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Embodiment 1

[0033] A method for producing parchment paper using a compound enzyme preparation, comprising the following steps:

[0034] (1) Pre-soaking water: weigh the skin, at room temperature, the liquid ratio is 1.5, add 500 U / mL lipase and 0.3% fungicide, turn for 5 min per hour, after 4 h, stop the drum overnight, and wash with water the next day .

[0035] (2) Main immersion: at room temperature, liquid ratio 1, the concentration of keratinase, glycosidase and lipase added are 40 U / mL, 40 U / mL and 500 U / mL respectively. After removing residual small hairs with 1.5% NaHS, they were washed with water and weighed.

[0036] (3) Liming: liquid ratio 2, add 6% lime, turn 15 minutes per hour, stop the drum overnight, and remove the flesh the next day.

[0037] (4) Liming: liquid ratio 2, add 3% lime, soak for 2-3 days and wash with water.

[0038] (5) Deliming: liquid ratio 2, add 1% formic acid, adjust pH to 6.

[0039] (6) Pickling: liquid ratio 1, add 7% sodium chloride, 2% anhydro...

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Abstract

The invention belongs to the technical field of parchment production, and particularly relates to a method for producing parchment by using a compound enzyme preparation, the method comprises the following process steps: pre-soaking: pre-soaking raw leather with wool in a leather-making drum; main soaking: adding a compound enzyme preparation in the main soaking process, wherein the compound enzyme preparation comprises lipase, protease and glycosidase; liming; re-liming; deliming; pickling; and disintegrating and drying the acid skin to obtain the parchment. According to the method for treating the sheepskin by adopting the compound enzyme preparation, the hair removal of the sheepskin and the dispersion of collagenous fibers are effectively realized, and the sheepskin is endowed with white and complete grain surfaces, so that the sheepskin can be better used for preparing parchment paper. In the production process of the parchment, the use amount of sulfide can be effectively reduced by applying the enzyme preparation, so that the pollution to the environment is reduced, and the finally prepared parchment is smooth and flat in grain surface and has good writing performance and water resistance.

Description

technical field [0001] The invention belongs to the technical field of parchment paper production, in particular to a method for producing parchment paper using a compound enzyme preparation. Background technique [0002] Parchment is a special "paper" material used to make books or provide writing. Using sheepskin as raw material, after depilation and degreasing treatment, after mechanical processing, we can obtain parchment paper with excellent properties such as white transparency, folding resistance, smooth grain surface and so on. In the traditional parchment paper production process, manual polishing or sulfide is often used to depilate the parchment. Manual polishing is time-consuming and labor-intensive; sodium sulfide and the hydrogen sulfide gas it produces are harmful to the human body. As the country's environmental protection requirements become more stringent, the application of sodium sulfide in hair removal is gradually limited. [0003] As a safe and clean...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C14C1/04C14C1/06C14C1/08C14B1/58
CPCC14C1/04C14C1/06C14C1/08C14B1/58
Inventor 曹珊宋金枝魏琳琳李彦春
Owner QILU UNIV OF TECH
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