阅读说明：本技术 一种鞋厂废旧皮革的再生方法 (Regeneration method of waste leather in shoe factory ) 是由 张�杰 梁雪静 于 2020-12-07 设计创作，主要内容包括：本发明是一种鞋厂废旧皮革的再生方法,步骤为：筛选,软化烘干,切割撕磨,调质,保浆,烘干成型,切边,打磨熨光,强化,干燥,收卷包装。本发明废旧皮革的再生方法,方法简单,便于操作,能够恢复废旧皮革的柔软性和强度,可进行二次使用,强化液快速渗入皮革内部,强化液中含有亚硒酸钠、胶原蛋白、谷胱甘肽和氨甲环酸,能够增强皮革中的胶原蛋白含量,促进金属离子与蛋白质络合,提高蛋白强度,增强皮革的柔软度和耐磨度；强化后进行冷冻干燥,加快水分散失,增加皮革孔隙度,提高皮革的吸湿和透气性。(The invention relates to a method for regenerating waste leather in a shoe factory, which comprises the following steps: screening, softening and drying, cutting and tearing, tempering, pulp retention, drying and forming, trimming, polishing and ironing, strengthening, drying, rolling and packaging. The method for regenerating the waste leather is simple and convenient to operate, can recover the softness and strength of the waste leather, can be used for the second time, and can ensure that the strengthening liquid quickly permeates into the leather and contains sodium selenite, collagen, glutathione and tranexamic acid, so that the content of the collagen in the leather can be enhanced, the complexation of metal ions and protein is promoted, the protein strength is improved, and the softness and the wear resistance of the leather are enhanced; after strengthening, the leather is freeze-dried, so that the water loss is accelerated, the porosity of the leather is increased, and the moisture absorption and the air permeability of the leather are improved.)

1. A regeneration method of waste leather in a shoe factory is characterized by comprising the following steps:

s1 screening

Conveying the leather garbage to a primary screening machine, screening large leather garbage in the leather garbage by the primary screening machine, conveying the large leather garbage to a first cleaning pool for cleaning and recycling, conveying the leather garbage to a fine screening machine, screening granular leather garbage by the fine screening machine, conveying the granular leather garbage to a second cleaning pool for cleaning and recycling, conveying the remaining leather garbage to a separation pool for cleaning, precipitating and separating, and fishing out leather scraps floating on the water surface and conveying the leather scraps to the cleaning pool;

s2 softening

Placing the cleaned large leather materials, the particle leather materials and leather scraps into softening liquid, and soaking in a rotary drum at the temperature of 10-15 ℃ for 8-10 hours to obtain a softening material;

s3, drying

Feeding the softened material into a drying chamber for drying;

s4, cutting and tearing

Putting the softened material into a tearing and grinding machine to tear and grind into leather fibers;

s5, hardening and tempering

Putting the leather fiber, the external crosslinking type cation organic silicon modified acrylate resin emulsion, the hand feeling agent, the rosin saponification liquid, the aluminum sulfate and the dehydrating agent into a stirring barrel, and uniformly stirring to form slurry;

s6, slurry preservation

Coating the slurry obtained in the step S5 on a conveyor belt, and allowing the slurry to enter the upper part of a slurry retaining device along with the conveyor belt to form blank slurry;

s7, drying and forming

The leather blank slurry enters a drying room with the temperature of 50-60 ℃ along with a conveyor belt to be dried for 15-30 min;

s8, trimming

Cutting off burrs on two sides of the dried leather blank by using an edge trimmer;

s9, polishing and ironing

The leather blank after edge cutting is subjected to surface treatment by a grinding machine and an ironing machine, and the surface is smooth and flat;

s10, strengthening

Placing the leather blank in strengthening solution, ultrasonically soaking at 31-32kHz and 33-35 ℃ for 20-25min, and taking out to obtain a strengthening material;

s11, drying

Drying the reinforcement material;

s12, rolling package

And (5) rolling the reinforced material into a coiled material through a rolling device to obtain the regenerated leather.

2. The method for regenerating the waste leather of the shoe factory as claimed in claim 1, wherein the softening liquid in the step S2 comprises acetic acid, chitosan and lactic acid culture solution, wherein the weight portion ratio of the acetic acid, chitosan and lactic acid culture solution is 1.3-1.5:0.2-0.4:92-98, the acetic acid is added into the lactic acid culture solution to be uniformly mixed during preparation, the chitosan is added, and the mixture is slowly heated and stirred until the chitosan is completely dissolved, so that the softening liquid is obtained.

3. The method for regenerating the waste leather of the shoe factory as claimed in claim 2, wherein the preparation method of the lactic acid culture solution in the softening solution comprises the following steps: inoculating lactobacillus into MRS liquid culture medium, mixing, fermenting at 40-42 deg.C for 45-50 hr, centrifuging, and removing precipitate to obtain lactic acid culture solution; the lactobacillus is one or more of lactobacillus acidophilus, lactobacillus casei, lactobacillus delbrueckii and lactobacillus plantarum.

4. The method as claimed in claim 3, wherein the grain size of the leather fiber in step S4 is 320-330 mesh.

5. The method for recycling waste leather of shoe factories according to claim 4, wherein in step S5, the weight ratio of leather fibers, external cross-linking type cationic silicone modified acrylate resin emulsion, hand feeling agent, rosin saponification liquid, aluminum sulfate and dehydrating agent is 100:8-10:0.3-0.5:2-3: 8-9.

6. The method for recycling waste leather of shoe factories according to claim 5, wherein the slurry retention time of step S6 is 5-7 min.

7. The method for recycling waste leather of shoe factories according to claim 6, wherein the strengthening liquid in the step S10 is composed of the following raw materials in parts by weight: 22-24 parts of sodium selenite, 11-13 parts of collagen, 7-9 parts of glutathione and 1.6-1.8 parts of tranexamic acid, adding the sodium selenite into water, stirring until the sodium selenite is completely dissolved, and then adding the rest raw materials to obtain the strengthening solution.

Technical Field

The invention relates to the technical field of leather recycling, in particular to a method for recycling waste leather in a shoe factory.

Background

In the process of manufacturing leather shoes, shoe factories always generate a large amount of leather residue, leather crumbs, trimming leftovers, leather grinding scraps and the like, the amount of leather waste residues produced in the production process every year and various leather products discarded due to damage, old style and the like is incredible, and if a large amount of waste leather cannot be effectively recycled, the environment is polluted, and huge waste of resources is caused.

Only a small part of waste leather is utilized, and the waste leather is crushed and then extracted with collagen or chromium, and finally, 30% of raw material residues are also used as fertilizers, thereby causing great waste on resources.

Disclosure of Invention

The invention aims to solve the defects of the prior art and provides a method for regenerating waste leather in a shoe factory.

In order to achieve the purpose, the invention adopts the following technical scheme:

a regeneration method of waste leather in a shoe factory comprises the following steps:

s1 screening

Conveying the leather garbage to a primary screening machine, screening large leather garbage in the leather garbage by the primary screening machine, conveying the large leather garbage to a first cleaning pool for cleaning and recycling, conveying the leather garbage to a fine screening machine, screening granular leather garbage by the fine screening machine, conveying the granular leather garbage to a second cleaning pool for cleaning and recycling, conveying the remaining leather garbage to a separation pool for cleaning, precipitating and separating, and fishing out leather scraps floating on the water surface and conveying the leather scraps to the cleaning pool;

s2 softening

Placing the cleaned large leather materials, the particle leather materials and leather scraps into softening liquid, and soaking in a rotary drum at the temperature of 10-15 ℃ for 8-10 hours to obtain a softening material;

s3, drying

Feeding the softened material into a drying chamber for drying;

s4, cutting and tearing

Putting the softened material into a tearing and grinding machine to tear and grind into leather fibers;

s5, hardening and tempering

Putting the leather fiber, the external crosslinking type cation organic silicon modified acrylate resin emulsion, the hand feeling agent, the rosin saponification liquid, the aluminum sulfate and the dehydrating agent into a stirring barrel, and uniformly stirring to form slurry;

s6, slurry preservation

Coating the slurry obtained in the step S5 on a conveyor belt, and allowing the slurry to enter the upper part of a slurry retaining device along with the conveyor belt to form blank slurry;

s7, drying and forming

The leather blank slurry enters a drying room with the temperature of 50-60 ℃ along with a conveyor belt to be dried for 15-30 min;

s8, trimming

Cutting off burrs on two sides of the dried leather blank by using an edge trimmer;

s9, polishing and ironing

The leather blank after edge cutting is subjected to surface treatment by a grinding machine and an ironing machine, and the surface is smooth and flat;

s10, strengthening

Placing the leather blank in strengthening solution, ultrasonically soaking at 31-32kHz and 33-35 ℃ for 20-25min, and taking out to obtain a strengthening material;

s11, drying

Drying the reinforcement material;

s12, rolling package

And (5) rolling the reinforced material into a coiled material through a rolling device to obtain the regenerated leather.

The softening liquid in the step S2 comprises acetic acid, chitosan and lactic acid culture solution, wherein the weight part ratio of the acetic acid, the chitosan and the lactic acid culture solution is 1.3-1.5:0.2-0.4:92-98, the acetic acid is added into the lactic acid culture solution to be uniformly mixed during preparation, the chitosan is added, and the mixture is slowly heated and stirred until the mixture is completely dissolved, so that the softening liquid is obtained.

The preparation method of the lactic acid culture solution in the softening solution comprises the following steps: inoculating lactobacillus into MRS liquid culture medium, mixing, fermenting at 40-42 deg.C for 45-50 hr, centrifuging, and removing precipitate to obtain lactic acid culture solution; the lactobacillus is one or more of lactobacillus acidophilus, lactobacillus casei, lactobacillus delbrueckii and lactobacillus plantarum.

The grain size of the cladding fiber in the step S4 is 320-330 meshes.

In step S5, the weight ratio of the leather fiber, the external crosslinking type cation organic silicon modified acrylate resin emulsion, the hand feeling agent, the rosin saponification liquid, the aluminum sulfate and the dehydrating agent is 100:8-10:0.3-0.5:2-3: 8-9.

The slurry retention time of the step S6 is 5-7 min.

The strengthening liquid in the step S10 is composed of the following raw materials in parts by weight: 22-24 parts of sodium selenite, 11-13 parts of collagen, 7-9 parts of glutathione and 1.6-1.8 parts of tranexamic acid, adding the sodium selenite into water, stirring until the sodium selenite is completely dissolved, and then adding the rest raw materials to obtain the strengthening solution.

The invention has the beneficial effects that: the method for regenerating the waste leather is simple and convenient to operate, can recover the softness and strength of the waste leather, can be used for the second time, and can ensure that the strengthening liquid quickly permeates into the leather and contains sodium selenite, collagen, glutathione and tranexamic acid, so that the content of the collagen in the leather can be enhanced, the complexation of metal ions and protein is promoted, the protein strength is improved, and the softness and the wear resistance of the leather are enhanced; after strengthening, the leather is freeze-dried, so that the water loss is accelerated, the porosity of the leather is increased, and the moisture absorption and the air permeability of the leather are improved.

Detailed Description

The invention will be further illustrated with reference to specific examples:

a regeneration method of waste leather in a shoe factory comprises the following steps:

s1 screening

Conveying the leather garbage to a primary screening machine, screening large leather garbage in the leather garbage by the primary screening machine, conveying the large leather garbage to a first cleaning pool for cleaning and recycling, conveying the leather garbage to a fine screening machine, screening granular leather garbage by the fine screening machine, conveying the granular leather garbage to a second cleaning pool for cleaning and recycling, conveying the remaining leather garbage to a separation pool for cleaning, precipitating and separating, and fishing out leather scraps floating on the water surface and conveying the leather scraps to the cleaning pool;

s2 softening

Placing the cleaned large leather materials, the particle leather materials and leather scraps into softening liquid, and soaking in a rotary drum at the temperature of 10-15 ℃ for 8-10 hours to obtain a softening material;

s3, drying

Feeding the softened material into a drying chamber for drying;

s4, cutting and tearing

Putting the softened material into a tearing and grinding machine to tear and grind into leather fibers;

s5, hardening and tempering

Putting the leather fiber, the external crosslinking type cation organic silicon modified acrylate resin emulsion, the hand feeling agent, the rosin saponification liquid, the aluminum sulfate and the dehydrating agent into a stirring barrel, and uniformly stirring to form slurry;

s6, slurry preservation

Coating the slurry obtained in the step S5 on a conveyor belt, and allowing the slurry to enter the upper part of a slurry retaining device along with the conveyor belt to form blank slurry;

s7, drying and forming

The leather blank slurry enters a drying room with the temperature of 50-60 ℃ along with a conveyor belt to be dried for 15-30 min;

s8, trimming

Cutting off burrs on two sides of the dried leather blank by using an edge trimmer;

s9, polishing and ironing

The leather blank after edge cutting is subjected to surface treatment by a grinding machine and an ironing machine, and the surface is smooth and flat;

s10, strengthening

Placing the leather blank in strengthening solution, ultrasonically soaking at 31-32kHz and 33-35 ℃ for 20-25min, and taking out to obtain a strengthening material;

s11, drying

Drying the reinforcement material;

s12, rolling package

And (5) rolling the reinforced material into a coiled material through a rolling device to obtain the regenerated leather.

The softening liquid in the step S2 comprises acetic acid, chitosan and lactic acid culture solution, wherein the weight part ratio of the acetic acid, the chitosan and the lactic acid culture solution is 1.3-1.5:0.2-0.4:92-98, the acetic acid is added into the lactic acid culture solution to be uniformly mixed during preparation, the chitosan is added, and the mixture is slowly heated and stirred until the mixture is completely dissolved, so that the softening liquid is obtained.

The preparation method of the lactic acid culture solution in the softening solution comprises the following steps: inoculating lactobacillus into MRS liquid culture medium, mixing, fermenting at 40-42 deg.C for 45-50 hr, centrifuging, and removing precipitate to obtain lactic acid culture solution; the lactobacillus is one or more of lactobacillus acidophilus, lactobacillus casei, lactobacillus delbrueckii and lactobacillus plantarum.

The grain size of the cladding fiber in the step S4 is 320-330 meshes.

In step S5, the weight ratio of the leather fiber, the external crosslinking type cation organic silicon modified acrylate resin emulsion, the hand feeling agent, the rosin saponification liquid, the aluminum sulfate and the dehydrating agent is 100:8-10:0.3-0.5:2-3: 8-9.

The slurry retention time of the step S6 is 5-7 min.

The strengthening liquid in the step S10 is composed of the following raw materials in parts by weight: 22-24 parts of sodium selenite, 11-13 parts of collagen, 7-9 parts of glutathione and 1.6-1.8 parts of tranexamic acid, adding the sodium selenite into water, stirring until the sodium selenite is completely dissolved, and then adding the rest raw materials to obtain the strengthening solution.

The method for regenerating the waste leather is simple and convenient to operate, can recover the softness and strength of the waste leather, can be used for the second time, and can ensure that the strengthening liquid quickly permeates into the leather and contains sodium selenite, collagen, glutathione and tranexamic acid, so that the content of the collagen in the leather can be enhanced, the complexation of metal ions and protein is promoted, the protein strength is improved, and the softness and the wear resistance of the leather are enhanced; after strengthening, the leather is freeze-dried, so that the water loss is accelerated, the porosity of the leather is increased, and the moisture absorption and the air permeability of the leather are improved.

The present invention has been described in connection with the specific embodiments, and it is obvious that the specific implementation of the present invention is not limited by the above-mentioned manner, and it is within the protection scope of the present invention as long as various modifications are made by using the method concept and technical solution of the present invention, or the present invention is directly applied to other occasions without modification.