CN102952907B - Method for depilating animal skin - Google Patents
Method for depilating animal skin Download PDFInfo
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- CN102952907B CN102952907B CN201110253887.1A CN201110253887A CN102952907B CN 102952907 B CN102952907 B CN 102952907B CN 201110253887 A CN201110253887 A CN 201110253887A CN 102952907 B CN102952907 B CN 102952907B
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Abstract
The invention relates to a method for depilating animal skin, which comprises the following steps: adding animal skin into a rotating drum or paddle, adding 100-300 wt% of water and 0.1-0.5 wt% of degreaser, rotating, and pouring out water; adding 100-300 wt% of water, 0.1-2 wt% of basifying agent, 0.1-0.5 wt% of rewetting agent, 0.1-0.5 wt% of degreaser, 0.1-1 wt% of first compound protease and 0.1-1 wt% of lipase, and rotating; adding 0.05-0.3 wt% of bactericide, and rotating; intermittently rotating for 5-24 hours, and pouring out water; adding 30-300 wt% of water, 0.1-3 wt% of depilating agent, 0.1-0.5 wt% of degreaser, 0.1-1 wt% of second compound protease and 0.1-1 wt% of lipase, and rotating; intermittently rotating while adding 0.2-2 wt% of sodium hydroxide by 2-4 times; adding 0.3-1.8 wt% of sodium sulfide, rotating, and stopping; intermittently rotating while adding 0.5-3 wt% of sodium hydroxide by 2-5 times; and adding 30-150 wt% of water, and pouring out water. The method provided by the invention can lower lime and sulfide contamination level in wastewater in the traditional sense.
Description
Technical field
The present invention relates to the method for a kind of animal skin depilation, more specifically, is do not use lime and a large amount of use reducing Sodium Sulphide about a kind of, thus significantly reduces the method for the waste of process hides processing procedure and the animal skin depilation of pollution level thereof.
Background technology
Leather is produced after tanning by animal fur with it, need through pre-immersion before tanning, immersion, depilation liming, the main processing procedure such as deliming, object is acquired animal skin to desalt, decontamination, animal skin is made to recover suitable water content and degrees of expansion, and keep its freshness, the step of most critical is just depilation liming, the quality of cortex is except the condition of animal skin itself, the step of depilation liming is also its a crucial factor, the object of this step is the hair of raw hide to destroy, open the collegen filament of leather and the natural animal grease of emulsification raw hide itself, in order to follow-up tanning processing procedure.Therefore, in brief, the leading portion program in process hides processing procedure, mainly will lose hair or feathers animal skin (comprising rawhide and salt marsh skin), and the opening to a certain degree of leather fiber do, to carry out the program of next stage.
In recent decades, in traditional process hides processing procedure, the main basic raw material of animal skin depilation and leather fiber open technique uses a large amount of lime and sulfide, it is low that the use of sulfide and lime has cost, efficiency is high, the advantage such as easy to control, but shortcoming be the solubleness of lime itself low (15 ~ 25%), make to also exist in waste water in a large number because lime does not dissolve produced throw out, and high chemical oxygen demand (the Chemical Oxygen Demand to produce because of a large amount of sulfide, COD), also have because sulfide causes the not labile high biochemical oxygen demand (BOD) of organism (Biochemical Oxygen Demand, BOD), so animal skin depilating procedure becomes in overall leather processing procedure, COD, the main producer of BOD and residue production.
There are many different process technique such as oxidative unhairing method, enzyme unhairing method and at present often by the organic amine that uses and organosulfur epilation in past.The main enzyme unhairing method and organic amine and organosulfur epilation of using solves above-mentioned problem, especially enzyme unhairing method at present, is more suggested discusses and experiment in recent years.Traditional enzyme unhairing method is suggested discussion always, but due to its mode using single proteolytic enzyme, makes operationally control for condition and actually operating seems comparatively loaded down with trivial details, and usually cause the destruction of surface grain and leather fiber excessively loose.
The main component of animal skin is protein and fat, so in the processing technology that animal skin is lost hair or feathers and leather fiber is open, decomposed must be given for fat to remove, for albumin, the non-structural protein such as sphaeroprotein and glycoprotein carries out decomposed removal, then for structural protein as collagen protein, elastin, Keratin sulfate etc. carry out decomposition and remove, so can reach the more satisfactory result that animal skin is lost hair or feathers and leather fiber is open, but still using lime and sulfide (sodium sulphite and Sodium sulfhydrate) as the main raw material of main decomposition protein and open leather fiber in conventional process, enzyme still uses as auxiliary agent.And traditional organic amine and organosulfur depilation rule are in the minimizing of COD and residue production, there is certain difficulty.
Therefore, need badly a kind of not only can reduce waste water in processing procedure pollution level, but also effectively can maintain the method for animal skin depilation of leather fiber quality.
Summary of the invention
Main purpose of the present invention is a kind of method providing animal skin to lose hair or feathers, so that animal skin is lost hair or feathers, the method of animal skin depilation of the present invention, comprise the following steps, the usage quantity of the material wherein beyond animal skin, all calculates with the weight percent of used animal skin (wt%):
A animal skin adds after in rotary drum or paddle-tumble by (), add water 100 ~ 300wt% and grease-removing agent 0.1 ~ 0.5wt%, and adjustment temperature to 20 ~ 30 DEG C, rotate 20 ~ 100 minutes, poured out by water.
B () adds water 100 ~ 300wt%, carries alkaline agent 0.1 ~ 2wt%, rewetting agent 0.1 ~ 0.5wt%, grease-removing agent 0.1 ~ 0.5wt%, first compound protease 0.1 ~ 1wt% and lipase 0.1 ~ 1wt%, adjustment temperature to 20 ~ 30 DEG C, pH to 8 ~ 11, rotate 60 ~ 200 minutes.
C () adds sterilant 0.05 ~ 0.3wt%, rotate 10 ~ 30 minutes.
D () intermittent type rotates 5 ~ 24 hours, poured out by water.
E () adds water 30 ~ 300wt%, add unvulcanised trichogen 0.1 ~ 3wt%, grease-removing agent 0.1 ~ 0.5wt%, second compound protease 0.1 ~ 1wt% and lipase 0.1 ~ 1wt%, and adjustment temperature to 20 ~ 30 DEG C, rotate 5 ~ 20 minutes.
F () uses intermittent type to rotate, add sodium hydroxide totally 0.2 ~ 2wt% for 2 ~ 4 times in the rotation time-division, and adjustment pH to 9 ~ 13, rotate 60 ~ 100 minutes.
G () adds sodium sulphite 0.3 ~ 1.8wt%, rotate 30 ~ 60 minutes, stops 30 ~ 60 minutes.
H () uses intermittent type to rotate, rotation per hour 10 minutes adds sodium hydroxide totally 0.5 ~ 3wt% for 2 ~ 5 times in the rotation time-division.
I () adds water 30 ~ 150wt%, intermittent type rotates 5 ~ 24 hours, is poured out by water.
This rewetting agent be thanomin, diethanolamine, trolamine, urea, sulfhydryl compound and fatty alcohol-polyoxyethylene ether at least one of them.
First compound protease and the second compound protease be come from respectively animal, plant, microorganism compound protease at least one of them, and the first compound protease and the second compound protease are mutually the same or different from each other.
This lipase be come from animal, plant, microorganism lipase at least one of them.
Unvulcanised trichogen is compounds containing thiol groups trichogen, is sulfhydryl compound and at least one of them the combination being selected from thanomin, diethanolamine, trolamine, urea and fatty alcohol-polyoxyethylene ether.
Above-described step (a), to step (i), wherein in step (h), is carried out circulation filter hair or is not carried out circulation filter hair while rotation.
The method of animal skin depilation of the present invention, applicable animal skin comprises rawhide or salt marsh skin.
Therefore, the method for animal skin depilation of the present invention, does not use lime and only uses a small amount of Sodium Sulphide, significantly reducing the environmental pollution that conventional process uses large quantities of lime and Sodium Sulphide to cause.
Embodiment
Below more detailed description is done to embodiments of the present invention, those skilled in the art can be implemented according to this after studying this specification sheets carefully.
The present invention is the method disclosing the depilation of a kind of animal skin, animal skin to be lost hair or feathers, the method for animal skin depilation of the present invention, comprises the following steps, the usage quantity of the material wherein beyond animal skin, all calculates with the weight percent of used animal skin (wt%):
A animal skin adds after in rotary drum or paddle-tumble by (), add water 100 ~ 300wt% and grease-removing agent 0.1 ~ 0.5wt%, and adjustment temperature to 20 ~ 30 DEG C, rotate 20 ~ 100 minutes, poured out by water.
B () adds water 100 ~ 300wt%, carries alkaline agent 0.1 ~ 2wt%, rewetting agent 0.1 ~ 0.5wt%, grease-removing agent 0.1 ~ 0.5wt%, first compound protease 0.1 ~ 1wt% and lipase 0.1 ~ 1wt%, adjustment temperature to 20 ~ 30 DEG C, pH to 8 ~ 11, rotate 60 ~ 200 minutes.
C () adds sterilant 0.05 ~ 0.3wt%, rotate 10 ~ 30 minutes.
D () intermittent type rotates 5 ~ 24 hours, poured out by water.
E () adds water 30 ~ 300wt%, add unvulcanised trichogen 0.1 ~ 3wt%, grease-removing agent 0.1 ~ 0.5wt%, second compound protease 0.1 ~ 1wt% and lipase 0.1 ~ 1wt%, and adjustment temperature to 20 ~ 30 DEG C, rotate 5 ~ 20 minutes.
F () uses intermittent type to rotate, add sodium hydroxide totally 0.2 ~ 2wt% for 2 ~ 4 times in the rotation time-division, and adjustment pH to 9 ~ 13, rotate 60 ~ 100 minutes.
G () adds sodium sulphite 0.3 ~ 1.8wt%, rotate 30 ~ 60 minutes, stops 30 ~ 60 minutes.
H () uses intermittent type to rotate, rotation per hour 10 minutes adds sodium hydroxide totally 0.5 ~ 3wt% for 2 ~ 5 times in the rotation time-division.
I () adds water 30 ~ 150wt%, intermittent type rotates 5 ~ 24 hours, is poured out by water.
Above-described step (a) is to step (d), employ rewetting agent, first compound protease and lipase carry out the program of soaking, step (e) to step (i) then when not using lime, unvulcanised trichogen is employed in alkaline environment, grease-removing agent, second compound protease, a small amount of Sodium Sulphide and sodium hydroxide swelling agent lose hair or feathers, and process hides program is afterwards by deliming steps, make according to normal flow, ammonium salt usage quantity 15-50% can be reduced at deliming steps, maybe can reduce deliming agent usage quantity 10-30%, low-sulfur like this, without the method that the animal skin of lime is lost hair or feathers, the object reducing environmental pollution can be reached.
This rewetting agent be thanomin, diethanolamine, trolamine, urea, sulfhydryl compound and fatty alcohol-polyoxyethylene ether at least one of them.
First compound protease and the second compound protease be come from respectively animal, plant, microorganism compound protease at least one of them, and the first compound protease and the second compound protease are mutually the same or different from each other.
This lipase be come from animal, plant, microorganism lipase at least one of them.
Unvulcanised trichogen is compounds containing thiol groups trichogen, is sulfhydryl compound and at least one of them the combination being selected from thanomin, diethanolamine, trolamine, urea and fatty alcohol-polyoxyethylene ether.
Above-described step (a), to step (i), wherein in step (h), is carried out circulation filter hair or is not carried out circulation filter hair while rotation.
The method of animal skin depilation of the present invention, applicable animal skin comprises rawhide or salt marsh skin.
Embodiment
About each step of method that above-described animal skin is lost hair or feathers, enumerate several example below, so that practical application mode of the present invention to be described.
Example one: the method for the animal skin depilation of upper leather American cattle
A () U.S. ox-hide 100kg, enters drum, pre-immersion (add water 150kg and grease-removing agent 0.2kg, temperature adjustment to 24 DEG C, rotates 60 minutes), pouring.
B () adds water 150kg, add INVIGAL NS (alkaline compound protease, Yue Tai Industry Co., Ltd) 0.2kg, INVIGAL DG (alkaline lipase, Yue Tai Industry Co., Ltd) 0.1kg, sodium carbonate 0.4kg, rewetting agent 0.15kg and grease-removing agent 0.2kg, temperature adjustment to 24 DEG C, rotates 120 minutes.
C () adds sterilant 0.1kg, rotate 15 minutes.
D () is adjusted to intermittent type and rotates, rotation per hour 5 minutes, about 16 hours, pouring.
E () adds water 80kg, add SIRO NL1 (unvulcanised trichogen, Yue Tai Industry Co., Ltd) 1.0kg, grease-removing agent 0.2kg, SIRO NL (alkaline compound protease, Yue Tai Industry Co., Ltd) 0.75kg and INVIGAL DG (lipase, Yue Tai Industry Co., Ltd) 0.2kg, temperature adjustment, to 25 DEG C, is rotated 10 minutes.
F () point adds sodium hydroxide 4 times, each 0.3kg, altogether 1.2kg, rotates 15 minutes at every turn, stop 10 minutes after adding sodium hydroxide.
G () adds sodium sulphite 1.2kg, rotate 30 minutes, stops 30 minutes.
H () uses intermittent type to rotate, rotation per hour 10 minutes divides and adds sodium hydroxide 3 times, each 0.3kg, altogether 0.9kg, and adds when rotating.
I () adds water 30kg, intermittent type rotates, rotation per hour 5 minutes, about 18 hours, pouring.
Example two: the method for the animal skin depilation of sofa artificial leather Australia ox
A () Australia ox-hide 100kg, enters drum, pre-immersion (add water 150kg and grease-removing agent 0.3kg, temperature adjustment to 24 DEG C, rotates 60 minutes), pouring.
B () adds water 160kg, add INVIGAL NS (alkaline compound protease, Yue Tai Industry Co., Ltd) 0.2kg, INVIGAL DG (alkaline lipase, Yue Tai Industry Co., Ltd) 0.2kg, sodium carbonate 0.6kg, rewetting agent 0.15kg and grease-removing agent 0.3kg, temperature adjustment to 24 DEG C, rotates 120 minutes
C () adds sterilant 0.15kg, rotate 15 minutes.
D () is adjusted to intermittent type and rotates, rotation per hour 5 minutes, about 18 hours, pouring.
E () adds water 80kg, add SIRO NL1 (unvulcanised trichogen, Yue Tai Industry Co., Ltd) 1.0kg, grease-removing agent 0.2kg, SIRO NL (alkaline compound protease, Yue Tai Industry Co., Ltd) 0.85kg and INVIGAL DG (lipase, Yue Tai Industry Co., Ltd) 0.3kg, temperature adjustment, to 25 DEG C, is rotated 10 minutes.
F () point adds sodium hydroxide 4 times, each 0.3kg, altogether 1.2kg, rotates 15 minutes at every turn, stop 10 minutes after adding sodium hydroxide.
G () adds sodium sulphite 1.2kg, rotate 30 minutes, stops 30 minutes.
H () uses intermittent type to rotate, rotation per hour 10 minutes divides and adds sodium hydroxide 3 times, each 0.3kg, altogether 0.9kg, and adds when rotating.
I () adds water 50kg, intermittent type rotates, rotation per hour 5 minutes, about 22 hours, pouring.
Example three: the method for the animal skin depilation of shoe lining leather Japan pigskin
A () Japanese pigskin 100kg, enters drum, pre-immersion (add water 150kg and grease-removing agent 0.3kg, temperature adjustment to 24 DEG C, rotates 80 minutes), pouring.
B () adds water 200kg, add INVIGAL NS (alkaline compound protease, Yue Tai Industry Co., Ltd) 0.3kg, INVIGAL DG (alkaline lipase, Yue Tai Industry Co., Ltd) 0.2kg, sodium carbonate 1.0kg, rewetting agent 0.2kg and grease-removing agent 0.4kg, temperature adjustment to 25 DEG C, rotates 160 minutes.
C () adds sterilant 0.2kg, rotate 15 minutes.
D () is adjusted to intermittent type and rotates, rotation per hour 5 minutes, about 18 hours, pouring.
E () adds water 80kg, add SIRO NL1 (unvulcanised trichogen, Yue Tai Industry Co., Ltd) 1.0kg, grease-removing agent 0.3kg, SIRO NL (alkaline compound protease, Yue Tai Industry Co., Ltd) 0.85kg and INVIGAL DG (lipase, Yue Tai Industry Co., Ltd) 0.3kg, temperature adjustment, to 25 DEG C, is rotated 10 minutes.
F () point adds sodium hydroxide 4 times, each 0.3kg, altogether 1.2kg, rotates 15 minutes at every turn, stop 10 minutes after adding sodium hydroxide.
G () adds sodium sulphite 1.6kg, rotate 30 minutes, stops 30 minutes.
H () uses intermittent type to rotate, rotation per hour 10 minutes divides and adds sodium hydroxide 4 times, each 0.3kg, altogether 1.2kg, and adds when rotating.
I () adds water 50kg, intermittent type rotates, rotation per hour 5 minutes, about 22 hours, pouring.
Example four: the method for the animal skin depilation of clothing leather Japan pigskin
A () Japanese pigskin 100kg, enters drum, pre-immersion (add water 150kg and grease-removing agent 0.3kg, temperature adjustment to 24 DEG C, rotates 80 minutes), pouring.
B () adds water 200kg, add INVIGAL NS (alkaline compound protease, Yue Tai Industry Co., Ltd) 0.3kg, INVIGAL DG (alkaline lipase, Yue Tai Industry Co., Ltd) 0.2kg, sodium carbonate 1.0kg, rewetting agent 0.2kg and grease-removing agent 0.4kg, temperature adjustment to 25 DEG C, rotates 180 minutes.
C () adds sterilant 0.2kg, rotate 15 minutes.
(d) be adjusted to intermittent type rotate, per hour turn 5 minutes, about 20 hours, pouring.
E () adds water 80kg, add SIRO NL1 (unvulcanised trichogen, Yue Tai Industry Co., Ltd) 1.0kg, grease-removing agent 0.3kg, SIRO NL (alkaline compound protease, Yue Tai Industry Co., Ltd) 0.85kg and INVIGAL DG (lipase, Yue Tai Industry Co., Ltd) 0.3kg, temperature adjustment, to 25 DEG C, is rotated 10 minutes.
F () point adds sodium hydroxide 4 times, each 0.3kg, altogether 1.2kg, rotates 15 minutes at every turn, stop 10 minutes after adding sodium hydroxide.
G () adds sodium sulphite 1.6kg, rotate 30 minutes, stops 30 minutes.
H () uses intermittent type to rotate, rotation per hour 10 minutes divides and adds sodium hydroxide 4 times, each 0.3kg, altogether 1.2kg, and adds when rotating.
I () adds water 50kg, intermittent type rotates, rotation per hour 5 minutes, about 22 hours, pouring.
Example five: the method for the animal skin depilation of upper leather goatskin
A () goatskin 100kg, enters drum, pre-immersion (add water 110kg and grease-removing agent 0.3kg, temperature adjustment to 24 DEG C, rotates 80 minutes), pouring.
B () adds water 200kg, add INVIGAL NS (alkaline compound protease, Yue Tai Industry Co., Ltd) 0.3kg, INVIGAL DG (alkaline lipase, Yue Tai Industry Co., Ltd) 0.2kg, sodium carbonate 0.8kg, rewetting agent 0.2kg and grease-removing agent 0.4kg, temperature adjustment to 25 DEG C, rotates 120 minutes.
C () adds sterilant 0.15kg, rotate 15 minutes.
(d) be adjusted to intermittent type rotate, per hour turn 5 minutes, about 16 hours, pouring.
E () adds water 80kg, add SIRO NL1 (unvulcanised trichogen, Yue Tai Industry Co., Ltd) 1.0kg, grease-removing agent 0.3kg, SIRO NL (alkaline compound protease, Yue Tai Industry Co., Ltd) 0.85kg and INVIGAL DG (lipase, Yue Tai Industry Co., Ltd) 0.3kg, temperature adjustment, to 25 DEG C, is rotated 10 minutes.
F () point adds sodium hydroxide 3 times, each 0.3kg, altogether 0.9kg, rotates 15 minutes at every turn, stop 10 minutes after adding sodium hydroxide.
G () adds sodium sulphite 1.6kg, rotate 30 minutes, stops 30 minutes.
H () uses intermittent type to rotate, rotation per hour 10 minutes divides and adds sodium hydroxide 4 times, each 0.3kg, altogether 1.2kg, and adds when rotating.
I () adds water 50kg, intermittent type rotates, rotation per hour 5 minutes, about 22 hours, pouring.
Example six: the method for the animal skin depilation of clothing leather lamb skin
A () lamb skin 100kg, enters drum, pre-immersion (add water 110kg and grease-removing agent 0.3kg, temperature adjustment to 24 DEG C, rotates 80 minutes), pouring.
B () adds water 200kg, add INVIGAL NS (alkaline compound protease, Yue Tai Industry Co., Ltd) 0.2kg, INVIGAL DG (alkaline lipase, Yue Tai Industry Co., Ltd) 0.2kg, sodium carbonate 0.8kg, rewetting agent 0.2kg and grease-removing agent 0.4kg, temperature adjustment to 25 DEG C, rotates 120 minutes.
C () adds sterilant 0.15kg, rotate 15 minutes.
(d) be adjusted to intermittent type rotate, per hour turn 5 minutes, about 16 hours, pouring.
E () goes out drum, painting alkali loses hair or feathers, enter drum, add water 150kg, adds SIRO NL1 (unvulcanised trichogen, Yue Tai Industry Co., Ltd) 1.0kg, grease-removing agent 0.3kg, SIRO NL (alkaline compound protease, Yue Tai Industry Co., Ltd) 0.6kg and INVIGAL DG (lipase, Yue Tai Industry Co., Ltd) 0.3kg, temperature adjustment, to 25 DEG C, is rotated 10 minutes.
F () point adds sodium hydroxide 3 times, each 0.3kg, altogether 0.9kg, rotates 15 minutes at every turn, stop 10 minutes after adding sodium hydroxide.
G () adds sodium sulphite 1.6kg, rotate 30 minutes, stops 30 minutes.
H () uses intermittent type to rotate, rotation per hour 10 minutes divides and adds sodium hydroxide 3 times, each 0.3kg, altogether 0.9kg, and adds when rotating.
I () adds water 50kg, intermittent type rotates, rotation per hour 5 minutes, about 22 hours, pouring.
Therefore, the method of animal skin depilation of the present invention, its principal feature is, in the leading portion program of process hides processing procedure, do not use lime and only use a small amount of Sodium Sulphide, completing the depilation of animal skin and the step of leather fiber opening, thus compared to traditional depilation processing procedure, the present invention significantly reduces the environmental pollution that conventional process uses large quantities of lime and Sodium Sulphide to cause, and the COD in waste water and suspended solids significantly reduce.
Another feature of the present invention is, the present invention uses the method combining chemistry and biotechnology, be applicable to the open step of various leather kind, the depilation of various leather purposes and leather fiber, and method used in the present invention, leather softness can be made to increase, and yield of leather promotes, thus can in ensuing chrome tanning processing procedure, reduce the usage quantity of chromium, thus reduce the chromium ion contamination level in Chrome Tanning Wastewater.
As described above is only to explain preferred embodiment of the present invention; not attempt does any pro forma restriction to the present invention according to this; therefore, all have any modification for the present invention or the change done under identical invention spirit, all must be included in the category that the invention is intended to protect.
Claims (8)
1. a method for animal skin depilation, animal skin to be lost hair or feathers, the method for this animal skin depilation is made up of following steps, and the usage quantity of the material wherein beyond this animal skin, all calculates with the weight percent of this animal skin (wt%):
A this animal skin adds after in rotary drum or paddle-tumble by (), add water 100 ~ 300wt% and grease-removing agent 0.1 ~ 0.5wt%, and adjustment temperature to 20 ~ 30 DEG C, rotate 20 ~ 100 minutes, poured out by water;
B () adds water 100 ~ 300wt%, carries alkaline agent 0.1 ~ 2wt%, rewetting agent 0.1 ~ 0.5wt%, grease-removing agent 0.1 ~ 0.5wt%, first compound protease 0.1 ~ 1wt% and lipase 0.1 ~ 1wt%, adjustment temperature to 20 ~ 30 DEG C, pH to 8 ~ 11, rotate 60 ~ 200 minutes;
C () adds sterilant 0.05 ~ 0.3wt%, rotate 10 ~ 30 minutes;
D () intermittent type rotates 5 ~ 24 hours, poured out by water;
E () adds water 30 ~ 300wt%, add unvulcanised trichogen 0.1 ~ 3wt%, grease-removing agent 0.1 ~ 0.5wt%, second compound protease 0.1 ~ 1wt% and lipase 0.1 ~ 1wt%, and adjustment temperature to 20 ~ 30 DEG C, rotate 5 ~ 20 minutes;
F () uses intermittent type to rotate, add sodium hydroxide totally 0.2 ~ 2wt% for 2 ~ 4 times in the rotation time-division, and adjustment pH to 9 ~ 13, rotate 60 ~ 100 minutes;
G () adds sodium sulphite 0.3 ~ 1.8wt%, rotate 30 ~ 60 minutes, stops 30 ~ 60 minutes;
H () uses intermittent type to rotate, rotation per hour 10 minutes adds sodium hydroxide totally 0.5 ~ 3wt% for 2 ~ 5 times in the rotation time-division; And
I () adds water 30 ~ 150wt%, intermittent type rotates 5 ~ 24 hours, is poured out by water.
2. the method for animal skin depilation as claimed in claim 1, wherein this rewetting agent be thanomin, diethanolamine, trolamine, urea, sulfhydryl compound and fatty alcohol-polyoxyethylene ether at least one of them.
3. the method for animal skin depilation as claimed in claim 1, wherein this first compound protease and this second compound protease be come from respectively animal, plant, microorganism compound protease at least one of them.
4. the method for animal skin depilation as claimed in claim 3, wherein this first compound protease and this second compound protease are mutually the same or different from each other.
5. the method for animal skin depilation as claimed in claim 1, wherein this lipase be come from animal, plant, microorganism lipase at least one of them.
6. the method for animal skin depilation as claimed in claim 1, wherein this unvulcanised trichogen is compounds containing thiol groups trichogen, is sulfhydryl compound and at least one of them the combination being selected from thanomin, diethanolamine, trolamine, urea and fatty alcohol-polyoxyethylene ether.
7. the method for animal skin depilation as claimed in claim 1, wherein in this step (h), carries out circulation filter hair or does not carry out circulation filter hair while rotation.
8. the method for animal skin depilation as claimed in claim 1, wherein this animal skin comprises rawhide or salt marsh skin.
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| CN103695576A (en) * | 2013-12-27 | 2014-04-02 | 山东华升化工科技有限公司 | Composite automatic basifying agent for tanning leathers |
| CN105107815B (en) * | 2015-06-25 | 2017-07-14 | 河南农业大学 | A kind of method of use chemical method and bioanalysis Combined Treatment dead livestock and poultry |
| CN105734182B (en) * | 2016-01-29 | 2017-10-24 | 佛山市聚成生化技术研发有限公司 | A kind of handling process before pigskin tanning and the pigskin before resulting tanning |
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| CN101760569A (en) * | 2008-12-25 | 2010-06-30 | 峰安皮业股份有限公司 | Leather making bio-pretreatment method |
| CN101445843A (en) * | 2008-12-30 | 2009-06-03 | 国家皮革质量监督检验中心（浙江） | Method for carrying out unhairing and liming treatment without dust and akali sulphide during buffalo hide tanning |
| CN102071268A (en) * | 2011-01-12 | 2011-05-25 | 宁波工程学院 | Dry hair-saving unhair treatment method of raw hide |
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