CN111748660A - Grain opening process for heavy grain growth of leather - Google Patents
Grain opening process for heavy grain growth of leather Download PDFInfo
- Publication number
- CN111748660A CN111748660A CN202010800340.8A CN202010800340A CN111748660A CN 111748660 A CN111748660 A CN 111748660A CN 202010800340 A CN202010800340 A CN 202010800340A CN 111748660 A CN111748660 A CN 111748660A
- Authority
- CN
- China
- Prior art keywords
- leather
- lime
- water
- soaking
- added
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- 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
-
- 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
- C14C1/04—Soaking
-
- 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
-
- 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
Landscapes
- 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 invention discloses a pattern opening process for leather original leather with heavy growth patterns, which is characterized in that partial leather materials with high growth pattern proportion or heavy growth patterns screened from original leather raw materials are used as raw materials to be subjected to pattern opening and flattening2S, reasonably designing and adding lime in batches, ensuring the stretching effect of the leather material by matching with low water temperature treatment, and obtaining the leather material with naturally stretched and opened leather grains subjected to grain opening treatment after adding water twice. The invention can be used for solving the problem of heavy grain growth of imported original skinThe method can improve the grade rate of finished products and effectively improve the leather yield.
Description
Technical Field
The invention relates to the technical field of preparation of environment-friendly leather, in particular to a pattern opening process for heavy pattern growth of leather original skin.
Background
The leather is used as a common basic material in clothes, home furnishings, ornaments and ornaments, is a denatured and non-rotten animal leather product obtained by physical and chemical processing such as unhairing, tanning and the like, and has better hand feeling, elasticity, comfort and air permeability.
In the leather processing process, the growth environments of cattle in different regions are different, the situation that the growth lines of a large number of imported cattle raw materials are heavy exists in some foreign countries, the growth lines are mainly concentrated on joints and necks, the processing performance of the leather is directly influenced, the growth lines of the original leather are opened, the original leather is stretched and smooth, the leather is more attractive, the leather yield is increased, and the use value and the economic value are improved.
Disclosure of Invention
The invention aims to provide a patterning process for the growth of leather hides, which can solve the puzzles and problems caused by the growth of the imported hides.
The technical problem solved by the invention is realized by adopting the following technical scheme:
a pattern opening process for the growth of leather skins with heavy patterns specifically comprises the following operation steps:
s1 soaking for the first time: directly putting raw material cowhide into a rotary drum for soaking at constant temperature, wherein the soaking water is 7-9 wt% of salt water, 0.2-0.5 wt% of soda ash is added in the soaking process, the soda ash is added in three times, the adding interval is 20-30 min, and the soaking time is controlled to be 24-30 h;
s2, soaking for the second time: cleaning the leather material after the first soaking treatment in the step S1 overnight, soaking for the second time in the second day, wherein the second soaking is carried out in a clean rotary drum, the soaking water is clear water, the pH value is adjusted to 9-10 by using sodium carbonate, the soaking is carried out for 80-120 min, and then 0.05-0.07 wt% of lipase removal enzyme is added for degreasing treatment for 100-150 min; adding Na after degreasing20.08-0.12 wt% of S and Na2S, treating for 16-20 hours, draining water after treatment, and cleaning the leather;
s3 liming: when in liming, firstly putting leather into a clean rotary drum, adding water to submerge the leather, recording the water adding amount as M, adding 0.2-0.5 wt% of NaHS, 0.2-0.5 wt% of liming enzyme and 1.0-1.5 wt% of liming auxiliary agent together for treatment for 25-35 min, and then sequentially operating according to the following steps:
adding 1-1.5 wt% of lime, adding the lime twice, wherein the operation gap of adding the lime twice is 15-25 min, and continuously reacting for 20-30 min after adding the lime for the second time;
mixing 0.8-1.5 wt% of NaHS and 0.1-0.3 wt% of Na2Dissolving S with water, adding into the solution evenly for three times, and adding NaHS and Na into the solution twice2The operation gap of S is 15-25 min, and the reaction is continued for 20-30 min after lime is added for the third time;
alternately adding Na into the ash leaching solution2S and lime, the adding rule is as follows: adding Na firstly2S，Na2The single addition of S is 0.3-0.6 wt%, and a small amount of water is dissolved and added before the addition, and Na is added2Adding S, reacting for 10-20 min, adding lime, wherein the single addition of the lime is 0.2-0.5 wt%, directly adding the lime into lime leaching liquid, reacting for 25min after adding the lime, and adding Na again2S, circularly performing twice;
directly adding 1-2 wt% of lime into the lime leaching solution at one time, reacting for 20min, and then continuously performing water replenishing twice, wherein 0.2-0.5M of clear water and 0.1-0.15 wt% of lime are added during the first water replenishing; and after 8-15 min after the first water replenishing, maintaining 0.2-0.3M of clear water and 1.5-2 wt% of lime for 20-30 min after the second water replenishing to obtain the leather material with naturally stretched and opened dermatoglyph after the texture opening treatment.
As a further limitation, in the process of the pattern opening process for the leather original skin to grow the heavy patterns, the rotating speed of the rotary drum is kept to be 1.2-1.8R/min all the time, and the temperature in the rotary drum is controlled to be 18-25 ℃.
In a further limitation, 0.08-0.15% of bactericide and/or 0.05-0.08% of degreasing agent are added in the soaking process of the step S1 and the step S2.
And the leather is further limited to be taken out after the soaking step of the step S1 is finished, and the leather is subjected to fleshing and skinning treatment, wherein the thickness of the sliced cowhide is controlled to be 2.3 mm-2.5 mm.
As a further limitation, when the leather is cleaned in step S2, clean water, which is 1.5-3 times of the water used for soaking in the second soaking water, is filled into the drum for cleaning.
As a further limitation, the leather which is subjected to the grain opening process of the leather original leather with heavy growing grains can adopt oil spraying from the front side and the back side to increase the softness and the stretching degree in the finishing process of subsequent processing, and the falling time is controlled within 12 hours in the falling procedure, so that the retraction of the growing grains is prevented.
Has the advantages that: the pattern opening process for the leather original skin growth pattern weight can be used for independently performing pattern opening treatment on a leather raw material and can also be used as a leather processing preorder process for integrally and continuously processing leather; the reasonable process technical flow is formulated, and the soaking pretreatment is enhanced by twice low-temperature water washing, so that the leather material is fully returned to the fresh leather state before processing; the lime scale expansion coefficient is improved through mild alkali expansion, so that the thickness of the sheet is more uniform, the lime scale is treated by using a liming auxiliary agent containing an expansion inhibitor before the alkali expansion, a small amount of lime scale is added for multiple times, so that the alkali expansion is milder, water is supplemented for multiple times, the liquid ratio is gradually amplified, and the skin expansion is more uniform and sufficient; before liming, liming auxiliary agent and liming enzyme are used for treatment, and lime powder is added to promote the opening of growth lines, so that the fullness is enhanced, and the aim of not excessively filling the surface is fulfilled.
Detailed Description
In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the invention easy to understand, the invention is further described with the specific embodiments.
In the embodiment, the raw material of the napakawa imported from America is used as a raw material, and the raw material of cowhide with heavy growth lines is selected and processed according to the following procedures:
directly putting raw material cowhide into an overload rotary drum to carry out first soaking treatment, controlling the soaking temperature to be 18 ℃ during the first soaking, soaking at constant temperature under the condition of the rotating speed of 1.5R/min, wherein the soaking water is 150 parts by mass of 8wt% of salt water, and 0.2 part by mass of bactericide and 0.1 part by mass of degreasing agent are added together; and meanwhile, dividing 0.3 part by mass of soda ash into three parts, adding the three parts into the rotary drum in a divided manner, wherein the interval between the two times of soda ash addition is 30min, sealing the rotary drum after the soda ash addition is finished, controlling the total soaking time to be 28h, and carrying out fleshing treatment on the soaked cowhide, wherein the thickness of the sliced hide is controlled to be 2.3 mm-2.5 mm.
Putting the beef cattle after fleshing overnight, putting the beef cattle into the cleaned overload rotary drum again for second soaking treatment on the second day, controlling the soaking temperature to be 18 ℃ during the second soaking treatment, soaking at constant temperature under the condition of the rotating speed of 1.5R/min, wherein the soaking water is 150 parts by mass of clear water, 0.2 part by mass of bactericide and 0.3 part by mass of soda are added into the clear water, regulating the pH value of the soaking water to be 9-10, and soaking for 90 min; then adding 0.1 part by mass of lipase for degreasing for 120min, and adding Na after the degreasing reaction is finished2S0.15 part by mass of the raw materials is treated for 18 hours, after the treatment is finished, water is drained, and 230 parts by mass of clear water is added for cleaning.
After the cleaning, draining the cleaning water to the greatest extent, and performing liming operation according to the following operation steps in sequence during liming:
adding 100 parts by weight of water, controlling the water temperature within 20 ℃, adding 0.3 part by weight of NaHS, 0.3 part by weight of liming enzyme and 1.2 parts by weight of liming auxiliary agent, and processing for 30 min;
adding 1.2 parts by mass of lime twice, wherein the operation gap of adding lime twice is 20min, and continuously reacting for 20min after adding lime for the second time;
0.9 parts by mass of NaHS and 0.2 parts by mass of Na are added2Dissolving S with water, adding into the solution evenly for three times, and adding NaHS and Na into the solution twice2The operation gap of the S is 20min, and the reaction is continued for 20min after lime is added for the third time;
alternately adding Na into the ash leaching solution2S and lime, the adding rule is as follows: adding Na firstly2S，Na2The single addition of S is 0.4 part by mass, and is dissolved with a small amount of water before addition, and Na is added2Reacting for 15min after S is added, adding lime with the single addition of 0.3 part by mass, directly adding the lime into the lime leaching solution, reacting for 25min after the lime is added, and adding Na again2S。
Adding Na twice circularly2And after the lime, directly adding 1 part by mass of lime into the lime leaching solution for one time, reacting for 20min, performing water replenishing twice, adding 30 parts by mass of clear water and 0.2 part by mass of lime during first water replenishing, andand (3) performing secondary water replenishing after 10min after the primary water replenishing, adding 20 parts by mass of clear water and 2 parts by mass of lime during the secondary water replenishing, and keeping for 20min to obtain the leather material with the naturally stretched and opened dermatoglyph after the dermatoglyph treatment.
The method can effectively solve the problem of heavy grain of the raw leather, and the treated leather material is close to the raw leather with the surface unfolded, so that the finished product is improved by 1-2 grades, and the leather yield is effectively improved.
The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (7)
1. The pattern opening process for the growth pattern weight of the leather hide is characterized by comprising the following operation steps:
s1 soaking for the first time: directly putting raw material cowhide into a rotary drum for soaking at constant temperature, wherein the soaking water is 7-9 wt% of salt water, 0.2-0.5 wt% of soda ash is added in the soaking process, the soda ash is added in three times, the adding interval is 20-30 min, and the soaking time is controlled to be 24-30 h;
s2, soaking for the second time: cleaning the leather material after the first soaking treatment in the step S1 overnight, soaking for the second time in the second day, wherein the second soaking is carried out in a clean rotary drum, the soaking water is clear water, the pH value is adjusted to 9-10 by using sodium carbonate, the soaking is carried out for 80-120 min, and then 0.05-0.07 wt% of lipase removal enzyme is added for degreasing treatment for 100-150 min; adding Na after degreasing20.08-0.12 wt% of S and Na2S, treating for 16-20 hours, draining water after treatment, and cleaning the leather;
s3 liming: when in liming, firstly putting leather into a clean rotary drum, adding water to submerge the leather, recording the water adding amount as M, adding 0.2-0.5 wt% of NaHS, 0.2-0.5 wt% of liming enzyme and 1.0-1.5 wt% of liming auxiliary agent together for treatment for 25-35 min, and then sequentially operating according to the following steps:
adding 1-1.5 wt% of lime, adding the lime twice, wherein the operation gap of adding the lime twice is 15-25 min, and continuously reacting for 20-30 min after adding the lime for the second time;
mixing 0.8-1.5 wt% of NaHS and 0.1-0.3 wt% of Na2Dissolving S with water, adding into the solution evenly for three times, and adding NaHS and Na into the solution twice2The operation gap of S is 15-25 min, and the reaction is continued for 20-30 min after lime is added for the third time;
alternately adding Na into the ash leaching solution2S and lime, the adding rule is as follows: adding Na firstly2S，Na2The single addition of S is 0.3-0.6 wt%, and a small amount of water is dissolved and added before the addition, and Na is added2Adding S, reacting for 10-20 min, adding lime, wherein the single addition of the lime is 0.2-0.5 wt%, directly adding the lime into lime leaching liquid, reacting for 25min after adding the lime, and adding Na again2S, circularly performing twice;
directly adding 1-2 wt% of lime into the lime leaching solution at one time, reacting for 20min, and then continuously performing water replenishing twice, wherein 0.2-0.5M of clear water and 0.1-0.15 wt% of lime are added during the first water replenishing; and after 8-15 min after the first water replenishing, maintaining 0.2-0.3M of clear water and 1.5-2 wt% of lime for 20-30 min after the second water replenishing to obtain the leather material with naturally stretched and opened dermatoglyph after the texture opening treatment.
2. The leather hide growth line weight cracking process of claim 1, wherein in the leather hide growth line weight cracking process, the rotating speed of the rotary drum is 1.2-1.8R/min, and the temperature in the rotary drum is controlled at 18-25 ℃.
3. The leather hide growth grain splitting process of claim 1, wherein 0.08-0.15% of bactericide and/or 0.05-0.08% of degreasing agent are added in the soaking process of the step S1 and the step S2.
4. The leather hide growth grain splitting process of claim 1, wherein the leather hide is taken out after the step of soaking in water of the step S1 is completed, and is subjected to fleshing and splitting treatment, and the thickness of the sliced cowhide is controlled to be 2.3 mm-2.5 mm.
5. The leather hide growth grain weight grooving process of claim 1, wherein when the leather is cleaned in the step S2, clean water with the water consumption being 1.5-3 times that of the second soaking water is filled into the rotary drum for cleaning.
6. The leather hide texture splitting process of claim 1, wherein the leather texture splitting process of the leather hide texture splitting process is characterized in that oil spraying is adopted on the front side and the back side to increase softness and stretching degree in the subsequent processing finishing process of the leather hide.
7. The leather hide texture splitting process of claim 1, wherein the leather texture splitting process of the leather hide texture splitting process controls the softening time within 12 hours in the subsequent processing step.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010800340.8A CN111748660B (en) | 2020-08-11 | 2020-08-11 | Grain opening process for heavy grain growth of leather |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010800340.8A CN111748660B (en) | 2020-08-11 | 2020-08-11 | Grain opening process for heavy grain growth of leather |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111748660A true CN111748660A (en) | 2020-10-09 |
| CN111748660B CN111748660B (en) | 2022-02-22 |
Family
ID=72713289
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010800340.8A Active CN111748660B (en) | 2020-08-11 | 2020-08-11 | Grain opening process for heavy grain growth of leather |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111748660B (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103849693A (en) * | 2014-01-21 | 2014-06-11 | 刘志学 | Novel splitting method for cowhide leather making |
| CN109811091A (en) * | 2019-04-11 | 2019-05-28 | 湖南银河制革有限公司 | A kind of production method of contracting line leather |
| CN110527755A (en) * | 2019-09-09 | 2019-12-03 | 兴业皮革科技股份有限公司 | A kind of leather method for sorting solving the big line depth of leather patterns |
-
2020
- 2020-08-11 CN CN202010800340.8A patent/CN111748660B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103849693A (en) * | 2014-01-21 | 2014-06-11 | 刘志学 | Novel splitting method for cowhide leather making |
| CN109811091A (en) * | 2019-04-11 | 2019-05-28 | 湖南银河制革有限公司 | A kind of production method of contracting line leather |
| CN110527755A (en) * | 2019-09-09 | 2019-12-03 | 兴业皮革科技股份有限公司 | A kind of leather method for sorting solving the big line depth of leather patterns |
Non-Patent Citations (3)
| Title |
|---|
| 但卫华: "《制革化学及工艺学》", 30 June 2006, 中国轻工业出版社 * |
| 曹向禹: "《制革加工理论与新技术》", 31 May 2009, 黑龙江人民出版社 * |
| 魏世林: "《制革工艺学》", 31 January 2001, 中国轻工业出版社 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN111748660B (en) | 2022-02-22 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102839236A (en) | Dual-purpose modification process for native breed sheepskin leather | |
| CN109811091B (en) | Production method of shrunk grain leather | |
| CN103397116B (en) | Tanning method of Tan sheep fur | |
| CN101230408A (en) | Non-chroming processing method for leather production | |
| CN113308581A (en) | Production method of clean cowhide plain nappa sofa leather | |
| CN109680108A (en) | A kind of processing method of high anti-aging type animal's leather of breathing freely | |
| CN108950100A (en) | A kind of production technology of original thicker environmental protection contracting flower cow hide | |
| CN111748660B (en) | Grain opening process for heavy grain growth of leather | |
| CN104313199B (en) | Little liquor ratio prepares the method for lamb skin clothes hair leather | |
| CN110656209B (en) | Method for making leather from sturgeon skin | |
| CN113832263B (en) | Production method of buffalo hide instead of buffalo hide | |
| CN102154529A (en) | Sturgeon leather production method and sturgeon leather produced using same | |
| CN109797258B (en) | Processing technology of cow leather and degreasing agent for cow leather | |
| CN109022630B (en) | Beach sheep fur treatment process, beach sheep fur and fur product | |
| CN108374062B (en) | Preparation method of rex rabbit fur, rex rabbit fur and fur product | |
| CN107604105B (en) | Production process of cattle leather for both fur and leather | |
| CN106222326B (en) | A kind of de-ash process for removing from office skin | |
| CN112746137A (en) | Preparation process of three-dimensional embossed leather | |
| CN116516079B (en) | Method for preparing blue wet leather by using puffer fish skin to preserve scales | |
| CN110257569A (en) | A kind of manufacture craft of vegetable tanning first layer lether | |
| CN105483297A (en) | Leather softening process | |
| CN111893222A (en) | Manufacturing method of ostrich grain leather | |
| US2741575A (en) | Hide glue manufacture | |
| CN113718066B (en) | Production process for producing horse gear leather | |
| US2132579A (en) | Method for producing unhaired hides with the aid of mold tryptases |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |