CN105483297A - Leather softening process - Google Patents
Leather softening process Download PDFInfo
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- CN105483297A CN105483297A CN201510837904.4A CN201510837904A CN105483297A CN 105483297 A CN105483297 A CN 105483297A CN 201510837904 A CN201510837904 A CN 201510837904A CN 105483297 A CN105483297 A CN 105483297A
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- hide
- leather
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- C—CHEMISTRY; METALLURGY
- C14—SKINS; HIDES; PELTS; LEATHER
- C14C—CHEMICAL TREATMENT OF HIDES, SKINS OR LEATHER, e.g. TANNING, IMPREGNATING, FINISHING; APPARATUS THEREFOR; COMPOSITIONS FOR TANNING
- C14C1/00—Chemical treatment prior to tanning
- C14C1/08—Deliming; Bating; Pickling; Degreasing
-
- C—CHEMISTRY; METALLURGY
- C14—SKINS; HIDES; PELTS; LEATHER
- C14C—CHEMICAL TREATMENT OF HIDES, SKINS OR LEATHER, e.g. TANNING, IMPREGNATING, FINISHING; APPARATUS THEREFOR; COMPOSITIONS FOR TANNING
- C14C1/00—Chemical treatment prior to tanning
- C14C1/06—Facilitating unhairing, e.g. by painting, by liming
- C14C1/065—Enzymatic unhairing
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Treatment And Processing Of Natural Fur Or Leather (AREA)
Abstract
The present invention relates to a leather softening process, belonging to the technical field of leather raw material processing. The process comprises steps of cleaning, dehairing, degreasing, pre-softening and softening. The process softens the cow leather raw material with surfactant co-enzyme processing technology. The whole process is easy to control. The prepared leather material has sufficient softness, and meanwhile has superior processability, and thus is especially suitable for being used as high grade leather.
Description
Technical field
The present invention relates to a kind of sofening treatment technique of leather, be specifically related to a kind of sofening treatment technique of ox-hide, belong to leather material processing technique field.
Background technology
Leather is the not perishable animal skin of sex change obtained through physics, chemical processes such as depilation and tannings.Chinese leather industry, through adjusting and optimizing structure, has begun to take shape in the whole nation that a collection of division of labor based on specialization is clear and definite, characteristic is given prominence to, to the leather production characteristic region and the specialized market that pull local economy to play very important effect.Their formation, has established the basis of Chinese leather industry development.
Leather, by animal origin classification, mainly contains pig leather, ox-hide leather, sheep, horse skin leather, donkey hide leather and kangaroo leather etc., separately has a small amount of fish skin leather, reptile leather, amphibian animal leather, ostrich leather etc.
A kind of main raw material skin of cattle hide process hides, has certain representativeness in international curriery.The feature of cattle hide is that epidermal area is thin, and account for 0.5% of skin total thickness, pore is small and dense, and grain is careful, and hair root and sweat gland are grown into skin corium not depths, and papillary layer and reticular layer boundary are obviously.Papillary layer accounts for skin total thickness about 1/5, and collagenous fiber bundle is thinner; Reticular layer collagenous fiber bundle is sturdy and braiding is tight.The each part thickness of ox-hide is comparatively even, and position difference is little, and a width is large and abundant, and physical mechanical strength is good, can cut open into several layers during process hides, and utilization ratio is high.Regulate humiture owing to having and there is ventilation property, so be suitable for all kinds of leather of processing and fabricating.As shoes, shoe-pad, waist-belt etc.
After cladding obtains from animal, need through certain treatment process with it, just can be used for being made into leatherware, and wherein sofening treatment is one of key affecting cladding quality.
CN201410053116.1 discloses a kind of wet blue and takes off chromium sofening treatment method, the method comprises rewetting rinsing, carries alkali, tempering, dealkalize, the step such as softening.Wet blue provided by the invention takes off chromium sofening treatment method, adopts acid, alkali, the coupling of enzyme complex art carry out de-chromium and soften, avoids the harm of Cr6+ to human body; Wet blue is while removing chromium or after de-chromium, then by the effect of alkali and macerating enzyme, makes leather fiber loose, reach and make leather do soft object.
CN201210566096.9 discloses a kind for the treatment of process of slunk, the method by slunk successively through main immersion, be coated with ash, liming, deliming, soften, pickling and tanning process, wherein, described softening being specially adds water and macerating enzyme carries out sofening treatment to the slunk after deliming process, and the mass ratio of described water, macerating enzyme and slunk is (120 ~ 250): (0.2 ~ 0.6): 100.
The microorganism of a kind of unhairing protease, its manufacture method, using method and this proteolytic enzyme of generation disclosed in CN00120641.9, its unhairing protease can be used for immersion technique in process hides and softening process.
The sofening treatment of current ox-hide, mostly is the integrated application of acid-alkali treatment, ferment treatment or both methods, and also has many bating agent products on the market.But excessive acid-alkali treatment can cause certain destruction to the structure of ox-hide, cause pliability not enough; And simple ferment treatment, cost is high, and effect is difficult to reach perfect condition.
Summary of the invention
The present invention is directed to prior art Problems existing, provide a kind of sofening treatment technique of leather, this technology utilization tensio-active agent associating enzyme treatment technique carries out sofening treatment to cattle hide raw material, and whole process is easy to control; The leather material prepared, pliability foot, processing characteristics is splendid simultaneously, is specially adapted to be used as high-grade leather material.
In order to solve the problem, the technical solution adopted in the present invention is:
A sofening treatment technique for leather, comprises the following steps:
(1) clean: after fresh ox-hide being removed the dirt of skin surface attachment, rinse 30 ~ 40min;
(2) lose hair or feathers: the hair on ox-hide surface is sheared major part, shear history is noted avoiding destroying ox-hide; Then with depilation ferment treatment, remaining ox hair is removed;
(3) degreasing: add normal-temperature water 200% ~ 250%, sodium formiate 3% ~ 7%, Industrial Salt 2% ~ 5%, grease-removing agent 2% ~ 5%, rotates 60 ~ 90min; Add soda ash 3% ~ 7%, rotate 70 ~ 80min; Regulate pH to be 6.8 ~ 7.0, keep 20 ~ 25min, discharge opeing;
(4) pre: add normal-temperature water 100% ~ 150%, regulates pH to be 2 ~ 3, rotates 20min; Then regulate pH9.0 ~ 10.0, rotate 25min; Cross clear water 3 times after acid-alkali treatment, rotate 20 ~ 25min, discharge opeing at every turn;
(5) softening: add 50 ~ 60 DEG C of water 150% ~ 200%, tensio-active agent 1% ~ 5%, rotating speed 100 ~ 200r/min turns 20 ~ 30min; Regulate pH to be 7.5 ~ 8.5, add enzyme 1% ~ 5%, rotating speed 10 ~ 16/min turns 40 ~ 60min.
Described ox-hide is cattle hide;
Tensio-active agent described in step (5) is non-ionic type surfactant;
Enzyme described in step (5) is Sumizyme MP.
The invention has the beneficial effects as follows:
(1) bating treatment process provided by the invention, make use of the features such as the high specificity that enzyme reaction has, is fully extended by the fibrous texture of ox-hide; Utilize tensio-active agent can arrange at the surface orientation of solution, and a kind of nonionogenic tenside that surface tension can be made significantly to decline, the pliability of ox-hide can be changed being beneficial to formation molecule aggregation body; And both are applied in together, nonionogenic tenside can also produce the promoter action in hydrolytic process to enzyme, enzymolysis is given full play to, also can shorten the treatment time, provide economic benefit.
(2) the sofening treatment technique of a kind of leather provided by the invention, whole process is easy to control; The cladding prepared, pliability foot, processing characteristics is splendid simultaneously, is specially adapted to be used as high-grade leather material.
Embodiment
Be described in further details the present invention below by embodiment, these embodiments are only used for the present invention is described, do not limit the scope of the invention.
embodiment 1
A sofening treatment technique for leather, comprises the following steps:
(1) clean: after fresh ox-hide being removed the dirt of skin surface attachment, rinse 30min;
(2) lose hair or feathers: the hair on ox-hide surface is sheared major part, shear history is noted avoiding destroying ox-hide; Then with depilation ferment treatment, remaining ox hair is removed;
(3) degreasing: add normal-temperature water 200%, sodium formiate 3%, Industrial Salt 2%, grease-removing agent 2%, rotates 60min; Add soda ash 3%, rotate 70min; Regulate pH to be 6.8, keep 20min, discharge opeing;
(4) pre: add normal-temperature water 100%, regulates pH to be 2, rotates 20min; Then regulate pH9.0, rotate 25min; Cross clear water 3 times after acid-alkali treatment, rotate 20min, discharge opeing at every turn;
(5) softening: add 50 DEG C of water 150%, tensio-active agent 1%, rotating speed 100r/min turns 20min; Regulate pH to be 7.5, add enzyme 1%, rotating speed 10/min turns 40min.
embodiment 2
A sofening treatment technique for leather, comprises the following steps:
(1) clean: after fresh ox-hide being removed the dirt of skin surface attachment, rinse 40min;
(2) lose hair or feathers: the hair on ox-hide surface is sheared major part, shear history is noted avoiding destroying ox-hide; Then with depilation ferment treatment, remaining ox hair is removed;
(3) degreasing: add normal-temperature water 250%, sodium formiate 7%, Industrial Salt 5%, grease-removing agent 5%, rotates 90min; Add soda ash 7%, rotate 80min; Regulate pH to be 7.0, keep 25min, discharge opeing;
(4) pre: add normal-temperature water 150%, regulates pH to be 3, rotates 20min; Then regulate pH10.0, rotate 25min; Cross clear water 3 times after acid-alkali treatment, rotate 25min, discharge opeing at every turn;
(5) softening: add 60 DEG C of water 00%, tensio-active agent 5%, rotating speed 200r/min turns 30min; Regulate pH to be 7.5 ~ 8.5, add enzyme 5%, rotating speed 16/min turns 60min.
embodiment 3
A sofening treatment technique for leather, comprises the following steps:
(1) clean: after fresh ox-hide being removed the dirt of skin surface attachment, rinse 35min;
(2) lose hair or feathers: the hair on ox-hide surface is sheared major part, shear history is noted avoiding destroying ox-hide; Then with depilation ferment treatment, remaining ox hair is removed;
(3) degreasing: add normal-temperature water 220%, sodium formiate 5%, Industrial Salt 3.5%, grease-removing agent 3.5%, rotates 70min; Add soda ash 5%, rotate 75min; Regulate pH to be 7.0, keep 22min, discharge opeing;
(4) pre: add normal-temperature water 130%, regulates pH to be 2.5, rotates 20min; Then regulate pH9.5, rotate 25min; Cross clear water 3 times after acid-alkali treatment, rotate 23min, discharge opeing at every turn;
(5) softening: add 55 DEG C of water 170%, tensio-active agent 3%, rotating speed 150r/min turns 25min; Regulate pH to be 8.0, add enzyme 3%, rotating speed 13/min turns 50min.
embodiment 4
A sofening treatment technique for leather, comprises the following steps:
(1) clean: after fresh ox-hide being removed the dirt of skin surface attachment, rinse 32min;
(2) lose hair or feathers: the hair on ox-hide surface is sheared major part, shear history is noted avoiding destroying ox-hide; Then with depilation ferment treatment, remaining ox hair is removed;
(3) degreasing: add normal-temperature water 210%, sodium formiate 4%, Industrial Salt 2% ~ 5%, grease-removing agent 2.5%, rotates 65min; Add soda ash 4%, rotate 71min; Regulate pH to be 6.8, keep 21min, discharge opeing;
(4) pre: add normal-temperature water 110%, regulates pH to be 2.1, rotates 20min; Then regulate pH9.3, rotate 25min; Cross clear water 3 times after acid-alkali treatment, rotate 21min, discharge opeing at every turn;
(5) softening: add 53 DEG C of water 160%, tensio-active agent 2%, rotating speed 120r/min turns 21min; Regulate pH to be 7.6, add enzyme 2%, rotating speed 11/min turns 45min.
embodiment 5
A sofening treatment technique for leather, comprises the following steps:
(1) clean: after fresh ox-hide being removed the dirt of skin surface attachment, rinse 38min;
(2) lose hair or feathers: the hair on ox-hide surface is sheared major part, shear history is noted avoiding destroying ox-hide; Then with depilation ferment treatment, remaining ox hair is removed;
(3) degreasing: add normal-temperature water 245%, sodium formiate 6%, Industrial Salt 4%, grease-removing agent 4%, rotates 80min; Add soda ash 6%, rotate 78min; Regulate pH to be 7.0, keep 24min, discharge opeing;
(4) pre: add normal-temperature water 135%, regulates pH to be 2.8, rotates 20min; Then regulate pH9.7, rotate 25min; Cross clear water 3 times after acid-alkali treatment, rotate 24min, discharge opeing at every turn;
(5) softening: add 56 DEG C of water 190%, tensio-active agent 3.5%, rotating speed 180r/min turns 27min; Regulate pH to be 8.1, add enzyme 4%, rotating speed 15/min turns 55min.
Claims (4)
1. a sofening treatment technique for leather, is characterized in that: comprise the following steps:
(1) clean: after fresh ox-hide being removed the dirt of skin surface attachment, rinse 30 ~ 40min;
(2) lose hair or feathers: the hair on ox-hide surface is sheared major part, shear history is noted avoiding destroying ox-hide; Then with depilation ferment treatment, remaining ox hair is removed;
(3) degreasing: add normal-temperature water 200% ~ 250%, sodium formiate 3% ~ 7%, Industrial Salt 2% ~ 5%, grease-removing agent 2% ~ 5%, rotates 60 ~ 90min; Add soda ash 3% ~ 7%, rotate 70 ~ 80min; Regulate pH to be 6.8 ~ 7.0, keep 20 ~ 25min, discharge opeing;
(4) pre: add normal-temperature water 100% ~ 150%, regulates pH to be 2 ~ 3, rotates 20min; Then regulate pH9.0 ~ 10.0, rotate 25min; Cross clear water 3 times after acid-alkali treatment, rotate 20 ~ 25min, discharge opeing at every turn;
(5) softening: add 50 ~ 60 DEG C of water 150% ~ 200%, tensio-active agent 1% ~ 5%, rotating speed 100 ~ 200r/min turns 20 ~ 30min; Regulate pH to be 7.5 ~ 8.5, add enzyme 1% ~ 5%, rotating speed 10 ~ 16/min turns 40 ~ 60min.
2. the sofening treatment technique of a kind of leather according to claim 1, is characterized in that: described ox-hide is cattle hide.
3. the sofening treatment technique of a kind of leather according to claim 1, is characterized in that: the tensio-active agent described in step (5), is non-ionic type surfactant.
4. the sofening treatment technique of a kind of leather according to claim 1, is characterized in that: the enzyme described in step (5) is Sumizyme MP.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510837904.4A CN105483297A (en) | 2015-11-26 | 2015-11-26 | Leather softening process |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510837904.4A CN105483297A (en) | 2015-11-26 | 2015-11-26 | Leather softening process |
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| CN105483297A true CN105483297A (en) | 2016-04-13 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201510837904.4A Pending CN105483297A (en) | 2015-11-26 | 2015-11-26 | Leather softening process |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106245253A (en) * | 2016-08-29 | 2016-12-21 | 福建永盛皮革制品有限公司 | By the waste and old method making electrostatic spinning powder fine hair containing chromium scurf |
| CN107513587A (en) * | 2017-09-21 | 2017-12-26 | 安徽鞋匠世家新型鞋材科技有限公司 | A kind of softening method for improving bating effect |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103789463A (en) * | 2014-02-17 | 2014-05-14 | 湖南立得皮革有限公司 | Blue wet cow leather dechroming/softening processing method |
| CN104531915A (en) * | 2014-12-17 | 2015-04-22 | 广东菲安妮皮具股份有限公司 | Method for processing cowhide leather |
| CN104711379A (en) * | 2015-02-12 | 2015-06-17 | 四川大学 | Enzyme unhairing method for removing damage to cowhide leather grain surface |
-
2015
- 2015-11-26 CN CN201510837904.4A patent/CN105483297A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103789463A (en) * | 2014-02-17 | 2014-05-14 | 湖南立得皮革有限公司 | Blue wet cow leather dechroming/softening processing method |
| CN104531915A (en) * | 2014-12-17 | 2015-04-22 | 广东菲安妮皮具股份有限公司 | Method for processing cowhide leather |
| CN104711379A (en) * | 2015-02-12 | 2015-06-17 | 四川大学 | Enzyme unhairing method for removing damage to cowhide leather grain surface |
Non-Patent Citations (1)
| Title |
|---|
| 左秋: "表面活性剂对酶与皮胶原作用体系的影响", 《中国皮革》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106245253A (en) * | 2016-08-29 | 2016-12-21 | 福建永盛皮革制品有限公司 | By the waste and old method making electrostatic spinning powder fine hair containing chromium scurf |
| CN107513587A (en) * | 2017-09-21 | 2017-12-26 | 安徽鞋匠世家新型鞋材科技有限公司 | A kind of softening method for improving bating effect |
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Application publication date: 20160413 |
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