阅读说明：本技术 一种舞蹈鞋用牛皮鞋面革的生产方法 (Production method of cow leather upper leather for dance shoes ) 是由 夏皓帆 范长华 范恩源 范亚西 张亚娟 强涛涛 于 2020-07-06 设计创作，主要内容包括：本发明公开了一种舞蹈鞋用牛皮鞋面革的生产方法,包括以下操作步骤：步骤S1、蓝湿皮分选；步骤S2、挤水伸展；步骤S3、削匀修边；步骤S4、漂洗水洗；步骤S5、中和；步骤S6、加脂；步骤S7、复鞣；步骤S8、中和；步骤S9、充填染色；步骤S10、二次加脂；步骤S11、固色,本发明通过改进牛皮生产工艺,为了提高产品工艺的适用性,生产原料不再单独从毛皮开始,选用常规鞋面革蓝皮作为原料,根据产品定位,可以选择不同路分的国产蓝皮或进口蓝皮,采用多次中和、分步加油的方法提高成品柔软度；在填充材料上选择不含甲醛的合成复鞣填充剂,提高皮革丰满度、减少部位差,做到“软而不松”。(The invention discloses a production method of cow leather upper leather for dancing shoes, which comprises the following operation steps: step S1, sorting the wet blue leather; step S2, water squeezing and stretching; step S3, shaving and trimming; step S4, rinsing and washing; step S5, neutralization; step S6, fat liquoring; step S7, retanning; step S8, neutralization; step S9, filling and dyeing; step S10, secondary greasing; s11, color fixation, namely improving a cowhide production process, selecting conventional shoe upper leather blues as raw materials instead of starting from furs independently in order to improve the applicability of a product process, selecting domestic blues or imported blues of different routes according to product positioning, and improving the softness of a finished product by adopting a method of multiple neutralization and step-by-step oiling; the synthetic retanning filler without formaldehyde is selected as the filling material, so that the fullness of the leather is improved, the difference of parts is reduced, and the leather is soft but not loose.)

1. A production method of cow leather upper leather for dance shoes is characterized by comprising the following operation steps: step S1, sorting the wet blue leather; step S2, water squeezing and stretching; step S3, shaving and trimming; step S4, rinsing and washing; step S5, neutralization; step S6, fat liquoring; step S7, retanning; step S8, neutralization; step S9, filling and dyeing; step S10, secondary greasing; step S11, fixing color; step S12, secondary water squeezing; step S13, vacuum drying; step S14, hanging and drying; step S15, dampening; step S16, vibration softening; step S17, softening; step S18, toggling and drying; step S19, secondary trimming; step S20, coating;

the step S1: selecting blue leather, wherein the width of the blue leather is 35-40 square feet;

the step S2: adopting a through type wringing machine to wring and stretch the blue leather;

the step S3: selecting a blue leather shaving machine with a 3000mm working surface to shave the head and the tail, wherein the shaving thickness is controlled to be 0.85-0.95 mm;

the step S4: putting the blue leather into a rotary drum, adding water accounting for 200% of the weight of the blue leather, adjusting the temperature in the rotary drum to 35-40 ℃, adding 1.0% of oxalic acid and 0.3% of OC, rotating for 90 minutes, detecting the pH value of bath liquid to be 3.5-3.8, checking the rewetting degree of the blue leather, draining water after the rewetting requirement is met, washing the blue leather for 10 minutes by using normal-temperature water accounting for 200%, and draining water;

the step S5: adding water with the weight being 150% of that of the blue leather into the rotary drum, adjusting the internal temperature of the rotary drum to be 33-35 ℃, adding 1% of sodium formate and 1% of neutralized tannin PAK, rotating for 30 minutes, adding 0.25% of baking soda, rotating for 40 minutes, measuring the pH value to be 4.3-4.5, and draining;

the step S6: adding water with the weight of 100% of the blue leather into the rotary drum, controlling the internal temperature to be 32-35 ℃, adding 2.0% of fatliquoring agent OSL, rotating for 30 minutes, adding 2.0% of TSP, and rotating for 30 minutes;

the step S7: adding 0.3% of formic acid, diluting the formic acid with 1:20 normal temperature water into the greasing bath solution in the step S6, adding the diluted formic acid into a shaft hole, rotating for 20 minutes, measuring the pH value to be 3.5-3.8, adding 2.0% of chrome-containing tannin CS, 2.0% of chromium powder and 1.0% of greasing agent U, rotating for 60 minutes, adding 2.5% of modified glutaraldehyde GTW, rotating for 40 minutes, adding 1.0% of sodium formate, rotating for 30 minutes, 0.6% of baking soda, dissolving and adding baking soda with normal temperature water, rotating for 40 minutes, measuring the pH value to be 3.9-4.1, replenishing water for 80%, adjusting the internal temperature to be about 35 ℃, rotating for 20 minutes, stopping the drum for 12 hours, rotating for 30 minutes and draining;

the step S8: adding water accounting for 150% of the weight of the blue leather into the rotary drum, controlling the internal temperature to be 33-35 ℃, adding 2.0% of PAK, rotating for 20 minutes, adding 1.5% of sodium formate and 0.7% of ammonium bicarbonate, rotating for 40 minutes, measuring the pH value to be 4.8-5.0, adding 1.5% of LSW and 1.0% of SPE, rotating for 40 minutes, draining water, and washing for 2 times;

the step S9: adding water with the weight of 100% of blue leather into a rotary drum, controlling the internal temperature to be 30-32 ℃, adding 3.0% of PR, rotating for 30 minutes, adding 3.0% of TSP, 2.0% of PMB, 2.5% of DLF, 1.0% of OT, 0.5% of BA, rotating for 40 minutes, adding 1-3% of dye, 1.0% of OT, 3.0% of FS, 2.0% of TA, 3.0% of SG, and 3.0% of OXT, rotating for 60 minutes, checking the dye permeation condition, supplementing 70% of hot water after the dye is completely permeated, adjusting the internal temperature to be about 45 ℃, adding 0.7% of formic acid, adding formic acid twice, adding half of the formic acid each time, adding the first time of rotation for 10 minutes, adding the second time of rotation for 20 minutes, measuring the pH to be 4.0-4.2, draining, and washing for 1 time;

the step S10: adding water with the weight of 200% of blue leather into a rotary drum, controlling the internal temperature to be 52-55 ℃, adding 1.5% CCL, rotating for 20 minutes, adding 3.0% BA, 1.5% E123, 3.0% SU-10 and 3.0% 94S, emulsifying and mixing the fatting agent by hot water with the temperature of 55-60 ℃, rotating for 60 minutes, adding 1.5% TSP, rotating for 30 minutes, adding 2.0% formic acid, diluting, adding twice, and adding at an interval of 30min each time;

the step S11: the fixation process requiring surface dyeing is as follows: adding 300% of water, controlling the internal temperature to be 45-48 ℃, adding 1-3% of fully-opened dye, rotating for 15 minutes, adding 0.5% of formic acid, rotating for 20 minutes, checking the color, adding 0.5% of formic acid after the color meets the requirement, rotating for 20 minutes, adding 0.3% of color fixing agent AL, rotating for 20 minutes, adding 0.5% of GS (soluble polysaccharide) and 0.3% of neat foot oil OPB (isopropyl-beta-hydroxy) of cationic fatting agent, rotating for 15 minutes, draining, and washing with water;

if no surface dyeing is needed, the fixation process is as follows: adding 300% of water, controlling the internal temperature to be 45-48 ℃, adding 0.5% of formic acid, rotating for 20 minutes, adding 0.3% of color fixing agent AL, rotating for 20 minutes, adding 0.5% of GS (yellow soil) and 0.3% of neat foot oil OPB (isopropyl-beta-hydroxy) of cationic fatting agent, rotating for 15 minutes, draining, and washing with water;

the step S12: placing the leather blank cured in the step S12 on a reciprocating type squeezing and stretching machine, squeezing and stretching the leather blank by adopting a two-knife method, wherein the stretching and stretching are required to be carried out, the whole leather blank is smooth and has no dead fold, after stretching, the moisture of the leather blank is preferably controlled to be 45-50%, and after stretching, the leather blank is placed and is flattened;

the step S13: spreading the flesh side of the crust leather upwards on a board by adopting a low-temperature vacuum machine, forcibly pushing the whole crust leather away, controlling the water content of the leather blank to be 40-45% after vacuum drying, and keeping the crust leather flat after vacuum drying for 3-5 hours, wherein the vacuum degree is 0.06MPa, the temperature is 43-45 ℃, and the time is 120-45 seconds;

the step S14: controlling the hanging and airing temperature at 38-42 ℃, and hanging and airing until the crust leather has 10-14% of water content and is uniform integrally;

the step S15: the dried leather is hung and dried, cooled to normal temperature, then normal-temperature water is uniformly sprayed on the flesh side of the dry base leather by a moisture regaining machine, covered tightly by a plastic film and kept stand for 12-18 h, and after moisture regaining, the moisture content of the leather is controlled at 14-16%;

the step S16: the damp crust leather can be softened by using a softening machine, and meanwhile, the crust leather is vibrated up and down and the periphery of the crust leather is softened;

the step S17: putting the leather blank after being softened into a stainless steel softening rotary drum, and softening and falling for 6-8 hours;

the step S18: placing the soft and fallen leather blanks on an automatic plate stretching machine for plate stretching operation, wherein the clamping distance is controlled to be 8-10 cm, the plate stretching distance is 1-3 cm, and the plate stretching time is 20-30 minutes;

the step S19: after the step S18 of toggling, trimming the crust leather, trimming useless corners, dead folds, burnt edges and rough edges of the follow-up leather making, and keeping the leather shape complete;

the step S20: polyacrylic acid and polyurethane film forming agents can be selected during coating, and casein, wax agents and hand feeling agents are matched.

2. The method for producing the cowhide upper leather for dancing shoes as claimed in claim 1, wherein in step S2, the water content of the blue leather is 55-60% and the blue leather is required to be smooth and free from dead folds after squeezing; in appearance, about 70% of the blue area is slightly whitish.

3. The method for producing the cowhide upper leather for dancing shoes according to claim 1, wherein in the step S3, the cut blue leather has a uniform thickness; the thickness of the four-foot knife is 0.1-0.15mm thinner than the body, the blue leather after being evenly cut is trimmed to remove useless corners and a straight opening is trimmed to form a round opening, and after the work is finished, the blue wet leather is accurately weighed and used as a material basis in the subsequent process.

4. The method for producing the cow leather upper leather for dancing shoes according to any one of claims 1 to 3, wherein in step S4, OC is a nonionic surfactant produced by Basff, which can help deep degreasing and sufficient rewetting of blue, and the surfactant remaining in the waste liquid has good biodegradability.

5. The method for producing the cowhide upper leather for dancing shoes according to claim 4, wherein in step S5, the baking soda is boiled at normal temperature in a ratio of 1:20 before use.

6. The method for producing the cowhide upper leather for dancing shoes according to claim 5, wherein in step S6, OSL is a synthetic fatliquor, which has excellent electrolyte resistance, strong permeability and good softness; TSP is a polymer of an organic resin, and imparts fine, compact grain and excellent softness to leather.

7. The method as claimed in claim 1, wherein in step S7, GTW is modified glutaraldehyde from basf to improve sweat resistance of the finished leather and further disperse natural oil, and the amount of chromium powder used in the retanning process is not more than 4.0%.

8. The method as claimed in claim 1, wherein in step S8, the liquid ratio is controlled to be 150-200%, the temperature is controlled to be about 34-36 ℃, and neutralization tannin PAK from LANXESS company is selected at the initial stage of neutralization, PAK has good buffer effect, has small influence on the alkalinity of chromium complex, and has mild and uniform neutralization effect, and after the neutralization buffer bath is formed, two neutralizers of sodium formate and ammonium bicarbonate are selected to be added in a matching manner, and the neutralization time is controlled to be 90-100 minutes.

9. The method for producing the cowhide upper leather for dancing shoes according to claim 1, wherein the animal protein CCL is added before the fatliquoring in step S10 to maintain the fullness and elasticity of the leather; after the oil is added, a proper amount of TSP organic resin polymer is added, so that the fine and compact grain surface of the leather can be kept, and the wear resistance of the finished leather is improved.

10. The method of claim 1, wherein in step S17, the milling parameters are controlled to be temperature: 35-40 ℃; the humidity is 65-70%.

Technical Field

The invention relates to the technical field of processing of cow leather shoe upper leather, in particular to a production method of cow leather shoe upper leather for dance shoes.

Background

Dancing shoes refer to shoes specially used for dancing, and are roughly divided into the following parts according to different dancing conditions: latin shoes, modern dance shoes, mixed dance shoes, jazz shoes, modern dance shoes, ballet shoes (toe shoes), national dance shoes, children's dance shoes, and so on. The high-grade dancing shoes are fine in manufacturing, exquisite in style, unique in design, exquisite in material selection, most importantly, comfortable to wear, and capable of giving the dancer a sense of lightness. The dance shoe vamp material is generally made of elastic cloth or PU material, the dance shoe made of the cow leather material is relatively few, the cow leather dance shoe material with good air permeability, wear resistance and flexibility can be produced by improving a cow leather production process, and compared with the traditional dance shoe fabric, the cow leather material is superior in sanitary performance, use performance and physical and chemical performance and good in market prospect.

Disclosure of Invention

The invention aims to solve the problems, designs a production method of cow leather upper leather for dancing shoes, and solves the problems in the background art.

The technical scheme of the invention for realizing the aim is as follows: a production method of cow leather upper leather for dance shoes comprises the following operation steps: step S1, sorting the wet blue leather; step S2, water squeezing and stretching; step S3, shaving and trimming; step S4, rinsing and washing; step S5, neutralization; step S6, fat liquoring; step S7, retanning; step S8, neutralization; step S9, filling and dyeing; step S10, secondary greasing; step S11, fixing color; step S12, secondary water squeezing; step S13, vacuum drying; step S14, hanging and drying; step S15, dampening; step S16, vibration softening; step S17, softening; step S18, toggling and drying; step S19, secondary trimming; step S20, coating;

the step S1: selecting blue leather, wherein the width of the blue leather is 35-40 square feet;

the step S2: adopting a through type wringing machine to wring and stretch the blue leather;

the step S3: selecting a blue leather shaving machine with a 3000mm working surface to shave the head and the tail, wherein the shaving thickness is controlled to be 0.85-0.95 mm;

the step S4: putting the blue leather into a rotary drum, adding water accounting for 200% of the weight of the blue leather, adjusting the temperature in the rotary drum to 35-40 ℃, adding 1.0% of oxalic acid and 0.3% of OC, rotating for 90 minutes, detecting the pH value of bath liquid to be 3.5-3.8, checking the rewetting degree of the blue leather, draining water after the rewetting requirement is met, washing the blue leather for 10 minutes by using normal-temperature water accounting for 200%, and draining water;

the step S5: adding water with the weight being 150% of that of the blue leather into the rotary drum, adjusting the internal temperature of the rotary drum to be 33-35 ℃, adding 1% of sodium formate and 1% of neutralized tannin PAK, rotating for 30 minutes, adding 0.25% of baking soda, rotating for 40 minutes, measuring the pH value to be 4.3-4.5, and draining;

the step S6: adding water with the weight of 100% of the blue leather into the rotary drum, controlling the internal temperature to be 32-35 ℃, adding 2.0% of fatliquoring agent OSL, rotating for 30 minutes, adding 2.0% of TSP, and rotating for 30 minutes;

the step S7: adding 0.3% of formic acid, diluting the formic acid with 1:20 normal temperature water, adding the diluted formic acid into a shaft hole, rotating for 20 minutes, measuring the pH value to be 3.5-3.8, adding 2.0% of chrome-containing tannin CS, 2.0% of chromium powder and 1.0% of fatting agent U, rotating for 60 minutes, adding 2.5% of modified glutaraldehyde GTW, rotating for 40 minutes, adding 1.0% of sodium formate, rotating for 30 minutes, 0.6% of baking soda, dissolving baking soda with normal temperature water, rotating for 40 minutes, measuring the pH value to be 3.9-4.1, replenishing water for 80%, adjusting the internal temperature to be about 35 ℃, rotating for 20 minutes, stopping the drum for 12 hours, rotating for 30 minutes, and draining;

the step S8: adding water accounting for 150% of the weight of the blue leather into the rotary drum, controlling the internal temperature to be 33-35 ℃, adding 2.0% of PAK, rotating for 20 minutes, adding 1.5% of sodium formate and 0.7% of ammonium bicarbonate, rotating for 40 minutes, measuring the pH value to be 4.8-5.0, adding 1.5% of LSW and 1.0% of SPE, rotating for 40 minutes, draining water, and washing for 2 times;

the step S9: adding water with the weight of 100% of blue leather into a rotary drum, controlling the internal temperature to be 30-32 ℃, adding 3.0% of PR, rotating for 30 minutes, adding 3.0% of TSP, 2.0% of PMB, 2.5% of DLF, 1.0% of OT, 0.5% of BA, rotating for 40 minutes, adding 1-3% of dye, 1.0% of OT, 3.0% of FS, 2.0% of TA, 3.0% of SG, and 3.0% of OXT, rotating for 60 minutes, checking the dye permeation condition, supplementing 70% of hot water after the dye is completely permeated, adjusting the internal temperature to be about 45 ℃, adding 0.7% of formic acid, adding formic acid twice, adding half of formic acid each time, adding the first time of rotation for 10 minutes, adding the second time of rotation for 20 minutes, measuring the pH value to be 4.0-4.2, draining, and washing for 1 time;

the step S10: adding water with the weight of 200% of blue leather into a rotary drum, controlling the internal temperature to be 52-55 ℃, adding 1.5% CCL, rotating for 20 minutes, adding 3.0% BA, 1.5% E123, 3.0% SU-10 and 3.0% 94S, emulsifying and mixing the fatting agent by hot water with the temperature of 55-60 ℃, rotating for 60 minutes, adding 1.5% TSP, rotating for 30 minutes, adding 2.0% formic acid, diluting, adding twice, and adding at an interval of 30min each time;

the step S11: the fixation process requiring surface dyeing is as follows: adding 300% of water, controlling the internal temperature to be 45-48 ℃, adding 1-3% of fully-opened dye, rotating for 15 minutes, adding 0.5% of formic acid, rotating for 20 minutes, checking color, adding 0.5% of formic acid after the color meets the requirement, rotating for 20 minutes, adding 0.3% of color fixing agent AL, rotating for 20 minutes, adding 0.5% of GS (soluble polysaccharide) and 0.3% of neat foot oil OPB (isopropyl-beta-hydroxy) of cationic fatting agent, rotating for 15 minutes, draining, and washing with water;

if no surface dyeing is needed, the fixation process is as follows: adding 300% of water, controlling the internal temperature to be 45-48 ℃, adding 0.5% of formic acid, rotating for 20 minutes, adding 0.3% of color fixing agent AL, rotating for 20 minutes, adding 0.5% of GS of cationic fatting agent and 0.3% of neat foot oil OPB, rotating for 15 minutes, draining, and washing with water;

the step S12: placing the leather blank cured in the step S12 on a reciprocating type squeezing and stretching machine, squeezing and stretching the leather blank by adopting a two-knife method, wherein the stretching and stretching are required to be carried out, the whole leather blank is smooth and has no dead fold, after stretching, the moisture of the leather blank is preferably controlled to be 45-50%, and after stretching, the leather blank is placed and is flattened;

the step S13: spreading the flesh side of the crust leather upwards on a board by adopting a low-temperature vacuum machine, forcibly pushing the whole crust leather away, controlling the water content of the crust leather to be 40-45% after vacuum drying, and keeping the crust leather flat after vacuum drying for 3-5 hours, wherein the vacuum degree is 0.06MPa, the temperature is 43-45 ℃, and the time is 120-45 seconds;

the step S14: controlling the hanging and airing temperature at 38-42 ℃, and hanging and airing until the crust leather has 10-14% of water content and is uniform integrally;

the step S15: the dried leather is hung and dried, cooled to normal temperature, then normal temperature water is uniformly sprayed on the flesh side of the dry base leather by a moisture regaining machine, the dry base leather is tightly covered by a plastic film and stands for 12-18 h, and after moisture regaining, the moisture content of the leather is controlled to be 14-16%;

the step S16: the damp crust leather can be softened by using a vibration softening machine, and meanwhile, the crust leather is vibrated up and down and the periphery of the crust leather is softened;

the step S17: putting the leather blank after being softened into a stainless steel softening rotary drum, and softening and falling for 6-8 hours;

the step S18: placing the soft and fallen leather blanks on an automatic plate stretching machine for plate stretching operation, wherein the clamping distance is controlled to be 8-10 cm, the plate stretching distance is 1-3 cm, and the plate stretching time is 20-30 minutes;

the step S19: after the step S18 of toggling, trimming the crust leather, trimming useless corners, dead folds, burnt edges and rough edges of the follow-up leather making, and keeping the leather shape complete;

the step S20: polyacrylic acid and polyurethane film forming agents can be selected during coating, and casein, wax agents and hand feeling agents are matched.

In the step S2, the water-squeezed blue leather is required to be smooth and free of dead folds, and the water content of the blue leather is 55-60%; in appearance, about 70% of the blue area is slightly whitish.

In the step S3, the cut blue leather has uniform thickness; the thickness of the four-foot knife is 0.1-0.15mm thinner than the body, the blue leather after being evenly cut is trimmed to remove useless corners, and a straight opening is trimmed to form a round opening.

In step S4, OC is a nonionic surfactant produced by basf, which helps deep degreasing and sufficient rewetting of the blue skin, and the surfactant remaining in the waste liquid has good biodegradability.

In step S5, the baking soda is boiled at normal temperature in a ratio of 1:20 before use.

In the step S6, the OSL is a synthetic fatliquor, so that the electrolyte resistance is excellent, the permeability is strong, and the softness is good; TSP is a polymer of an organic resin, and imparts fine, compact grain and excellent softness to leather.

In the step S7, GTW is modified glutaraldehyde produced by basf, which can improve the sweat resistance of finished leather and further disperse natural grease, and the use amount of chromium powder is not more than 4.0% in the retanning process.

In the step S8, the liquid ratio is controlled to be 150-200%, the temperature is controlled to be about 34-36 ℃, the neutralization tannin PAK of LANXESS company is selected for matching at the initial neutralization stage, the PAK has good buffer action, the influence on the alkalinity of the chromium complex is small, the neutralization action is mild and uniform, two neutralizers of sodium formate and ammonium bicarbonate are selected for matching and adding after the neutralization buffer bath is formed, and the neutralization time is controlled to be 90-100 minutes.

In the step S10, the animal protein CCL is added before fat-liquoring, so that the fullness and elasticity of the leather can be kept; after the oil is added, a proper amount of TSP organic resin polymer is added, so that the fine and compact grain surface of the leather can be kept, and the wear resistance of the finished leather is improved.

In step S17, the milling parameter is controlled to be, temperature: 35-40 ℃; the humidity is 65-70%.

According to the production method of the cowhide upper leather for the dance shoes, which is manufactured by the technical scheme, the production process of the cowhide is improved, in order to improve the applicability of the product process, the production raw materials do not start from fur alone, the blue leather of the conventional upper leather is selected as the raw material, domestic blue leather or imported blue leather with different routes can be selected according to product positioning, and the softness of a finished product is improved by adopting a method of multiple neutralization and step-by-step oiling; selecting a synthetic retanning filler without formaldehyde on a filling material, improving the fullness of the leather, reducing the position difference and achieving 'soft but not loose'; the modified glutaraldehyde is matched with tannin for retanning, so that the air permeability and the sweat resistance of a finished product are improved; in view of the particularity of the dance shoe, a proper amount of hyperbranched polymer with a deodorization function is added in the filling process, so that the finished leather has good sanitary performance, and the leather produced by the method is good in air permeability and sweat resistance, soft and comfortable in texture and free of stimulation to skin and can be used as a dance shoe upper material through green environment-friendly chemical materials and a clean production process.

Detailed Description

As described in detail below, a method for producing a cowhide upper leather for a dance shoe, comprising the steps of: step S1, sorting the wet blue leather; step S2, water squeezing and stretching; step S3, shaving and trimming; step S4, rinsing and washing; step S5, neutralization; step S6, fat liquoring; step S7, retanning; step S8, neutralization; step S9, filling and dyeing; step S10, secondary greasing; step S11, fixing color; step S12, secondary water squeezing; step S13, vacuum drying; step S14, hanging and drying; step S15, dampening; step S16, softening by vibration; step S17, softening; step S18, toggling and drying; step S19, secondary trimming; step S20, coating; the step S1: selecting blue leather, wherein the width of the blue leather is 35-40 square feet; the step S2: adopting a through type wringing machine to wring and stretch the blue leather; the step S3: selecting a blue leather shaving machine with a working surface of 3000mm to shave the head and the tail, and controlling the shaving thickness to be 0.85-0.95 mm; the step S4: putting the blue leather into a rotary drum, adding water accounting for 200% of the weight of the blue leather, adjusting the temperature in the rotary drum to 35-40 ℃, adding 1.0% of oxalic acid and 0.3% of OC, rotating for 90 minutes, detecting the pH value of bath liquid to be 3.5-3.8, checking the rewetting degree of the blue leather, draining water after the rewetting requirement is met, washing the blue leather for 10 minutes by using normal-temperature water accounting for 200%, and draining the water; the step S5: adding water with the weight being 150% of that of the blue leather into the rotary drum, adjusting the internal temperature of the rotary drum to be 33-35 ℃, adding 1% of sodium formate and 1% of neutralized tannin PAK, rotating for 30 minutes, adding 0.25% of chionanthus retusus, rotating for 40 minutes, measuring the pH value to be 4.3-4.5, and draining; the step S6: adding water with the weight of 100% of the blue leather into the rotary drum, controlling the internal temperature to be 32-35 ℃, adding 2.0% of fatliquoring agent OSL, rotating for 30 minutes, adding 2.0% of TSP, and rotating for 30 minutes; the step S7: adding 0.3% of formic acid, diluting the formic acid with 1:20 normal temperature water, adding the diluted formic acid into a shaft hole, rotating for 20 minutes, measuring the pH value to be 3.5-3.8, adding 2.0% of chrome-containing tannin CS, 2.0% of chromium powder and 1.0% of fatting agent U, rotating for 60 minutes, adding 2.5% of modified glutaraldehyde GTW, rotating for 40 minutes, adding 1.0% of sodium formate, rotating for 30 minutes, 0.6% of baking soda, dissolving and adding baking soda with normal temperature water, rotating for 40 minutes, measuring the pH value to be 3.9-4.1, replenishing water for 80%, adjusting the internal temperature to be about 35 ℃, rotating for 20 minutes, stopping the drum for 12 hours, rotating for 30 minutes and draining; the step S8: adding water accounting for 150% of the weight of the blue leather into the rotary drum, controlling the internal temperature to be 33-35 ℃, adding 2.0% of PAK, rotating for 20 minutes, adding 1.5% of sodium formate and 0.7% of ammonium bicarbonate, rotating for 40 minutes, measuring the pH value to be 4.8-5.0, adding 1.5% of LSW and 1.0% of SPE, rotating for 40 minutes, draining water, and washing for 2 times; the step S9: adding 100% of water by weight of blue leather into a rotary drum, controlling the internal temperature to be 30-32 ℃, adding 3.0% of PR, rotating for 30 minutes, adding 3.0% of TSP, 2.0% of PMB, 2.5% of DLF, 1.0% of OT, 0.5% of BA, rotating for 40 minutes, adding 1-3% of dye, 1.0% of OT, 3.0% of FS, 2.0% of TA, 3.0% of SG, and 3.0% of OXT, rotating for 60 minutes, checking the dye permeation condition, supplementing 70% of hot water after the dye is completely permeated, adjusting the internal temperature to be about 45 ℃, adding 0.7% of formic acid, adding formic acid twice, adding half of each time, adding the first rotation for 10 minutes, adding the second rotation for 20 minutes, measuring the pH to be 4.0-4.2, draining, and washing for 1 time; the step S10: adding water with the weight of 200% of blue leather into a rotary drum, controlling the internal temperature to be 52-55 ℃, adding 1.5% CCL, rotating for 20 minutes, adding 3.0% BA, 1.5% E123, 3.0% SU-10 and 3.0% 94S, emulsifying and mixing the fatting agent by hot water with the temperature of 55-60 ℃, adding after rotating for 60 minutes, adding 1.5% TSP, rotating for 30 minutes, adding 2.0% formic acid, diluting, adding twice at the interval of 30min each time; the step S11: the fixation process requiring surface dyeing is as follows: adding 300% of water, controlling the internal temperature to be 45-48 ℃, adding 1-3% of fully-opened dye, rotating for 15 minutes, adding 0.5% of formic acid, rotating for 20 minutes, checking the color, adding 0.5% of formic acid after the color meets the requirement, rotating for 20 minutes, adding 0.3% of color fixing agent AL, rotating for 20 minutes, adding 0.5% of GS (soluble polysaccharide) and 0.3% of neat foot oil OPB (isopropyl-beta-hydroxy) of cationic fatting agent, rotating for 15 minutes, draining, and washing with water; if no surface dyeing is needed, the fixation process is as follows: adding 300% of water, controlling the internal temperature to be 45-48 ℃, adding 0.5% of formic acid, rotating for 20 minutes, adding 0.3% of color fixing agent AL, rotating for 20 minutes, adding 0.5% of GS (yellow wine) and 0.3% of neat foot oil OPB (isopropyl-beta-hydroxy) of cationic fatting agent, rotating for 15 minutes, draining, and washing with water; the step S12: placing the leather blank cured in the step S12 on a reciprocating type squeezing and stretching machine, squeezing and stretching the leather blank by adopting a two-knife method, wherein stretching and stretching are required, the whole leather blank is smooth and has no dead fold, after stretching, the moisture of the leather blank is controlled to be 45-50%, and after stretching, the leather blank is placed and flattened; step S13: spreading the flesh side of the crust leather upwards on a board by adopting a low-temperature vacuum machine, forcibly pushing the whole crust leather away, controlling the water content of the leather blank to be 40-45% after vacuum drying, and keeping the crust leather flat after vacuum drying for 3-5 hours, wherein the vacuum degree is 0.06MPa, the temperature is 43-45 ℃, and the time is 120-45 seconds; the step S14: controlling the hanging and airing temperature at 38-42 ℃, and hanging and airing until the crust leather has 10-14% of water content and is uniform integrally; the step S15: the dried leather is hung and dried, cooled to normal temperature, then normal-temperature water is uniformly sprayed on the flesh side of the dry base leather by a moisture regaining machine, covered tightly by a plastic film and kept stand for 12-18 h, and after moisture regaining, the moisture content of the leather is controlled at 14-16%; the step S16: the damp crust leather can be softened by using a softening machine, and meanwhile, the crust leather is vibrated up and down and the periphery of the crust leather is softened; the step S17: putting the leather blank after being softened into a stainless steel softening rotary drum, and softening and falling for 6-8 hours; the step S18: placing the soft and fallen leather blank on an automatic stretching machine for stretching operation, wherein the clamping distance is controlled to be 8-10 cm, the stretching distance of the stretching plate is 1-3 cm, and the stretching time is 20-30 minutes; the step S19: after the stretching in the step S18, trimming the crust leather, trimming useless edges, dead folds, burnt edges and rough edges of the follow-up leather making, and keeping the skin shape complete; the step S20: polyacrylic acid and polyurethane film forming agents can be selected during coating, and casein, wax agents and hand feeling agents are matched; in the step S2, the water-squeezed blue leather is required to be smooth and free of dead folds, and the water content of the blue leather is 55-60%; in appearance, about 70% of the blue area is slightly white; in the step S3, the cut blue skin has uniform thickness; the thickness of the four-foot knife is 0.1-0.15mm thinner than the body, the trimmed blue leather is trimmed to remove useless corners, and a straight opening is trimmed to form a round opening; in step S4, OC is a nonionic surfactant produced by basf, which can help deep degreasing and sufficient rewetting of blue, and the surfactant remaining in the waste liquid has good biodegradability; in the step S5, before the baking soda is used, the baking soda is boiled at normal temperature according to the proportion of 1: 20; in the step S6, the OSL is a synthetic fat liquor, and has excellent electrolyte resistance, strong permeability and good softness; TSP is a polymer of an organic resin, which imparts fine, compact grain and excellent softness to leather; in step S7, GTW is modified glutaraldehyde from Basf, which can improve sweat resistance of finished leather and improve moisture resistance of finished leather

The implementation scheme is characterized by comprising the following operation steps: step S1, sorting the wet blue leather; step S2, squeezing and stretching; step S3, shaving and trimming; step S4, rinsing and washing; step S5, neutralization; step S6, fat liquoring; step S7, retanning; step S8, neutralization; step S9, filling and dyeing; step S10, secondary greasing; step S11, fixing color; step S12, secondary water squeezing; step S13, vacuum drying; step S14, hanging and drying; step S15, dampening; step S16, vibration softening; step S17, softening; step S18, toggling and drying; step S19, secondary trimming; step S20, coating;

the step S1: selecting blue leather, wherein the width of the blue leather is 35-40 square feet; the step S2: adopting a through type wringing machine to wring and stretch the blue leather; the step S3: selecting a blue leather shaving machine with a 3000mm working surface to shave the head and the tail, wherein the shaving thickness is controlled to be 0.85-0.95 mm; the step S4: putting the blue leather into a rotary drum, adding water accounting for 200% of the weight of the blue leather, adjusting the temperature in the rotary drum to 35-40 ℃, adding 1.0% of oxalic acid and 0.3% of OC, rotating for 90 minutes, detecting the pH value of bath liquid to be 3.5-3.8, checking the rewetting degree of the blue leather, draining water after the rewetting requirement is met, washing the blue leather for 10 minutes by using normal-temperature water accounting for 200%, and draining water; the step S5: adding water with the weight being 150% of that of the blue leather into the rotary drum, adjusting the internal temperature of the rotary drum to be 33-35 ℃, adding 1% of sodium formate and 1% of neutralized tannin PAK, rotating for 30 minutes, adding 0.25% of baking soda, rotating for 40 minutes, measuring the pH value to be 4.3-4.5, and draining; the step S6: adding water with the weight of 100% of the blue leather into the rotary drum, controlling the internal temperature to be 32-35 ℃, adding 2.0% of fatliquoring agent OSL, rotating for 30 minutes, adding 2.0% of TSP, and rotating for 30 minutes; the step S7: adding 0.3% of formic acid, diluting the formic acid with 1:20 normal temperature water, adding the diluted formic acid into a shaft hole, rotating for 20 minutes, measuring the pH value to be 3.5-3.8, adding CS 2.0% of chrome-containing tannin, 2.0% of chromium powder and 1.0% of fatting agent U, rotating for 60 minutes, adding GTW 2.5% of modified glutaraldehyde, rotating for 40 minutes, adding 1.0% of sodium formate, rotating for 30 minutes, 0.6% of baking soda, dissolving baking soda with normal temperature water, rotating for 40 minutes, measuring the pH value to be 3.9-4.1, replenishing water for 80%, adjusting the internal temperature to be about 35 ℃, rotating for 20 minutes, stopping the drum for 12 hours, rotating for 30 minutes, and draining; the step S8: adding water accounting for 150% of the weight of the blue leather into the rotary drum, controlling the internal temperature to be 33-35 ℃, adding 2.0% of PAK, rotating for 20 minutes, adding 1.5% of sodium formate and 0.7% of ammonium bicarbonate, rotating for 40 minutes, measuring the pH value to be 4.8-5.0, adding 1.5% of LSW and 1.0% of SPE, rotating for 40 minutes, draining water, and washing for 2 times; the step S9: adding water with the weight of 100% of blue leather into a rotary drum, controlling the internal temperature to be 30-32 ℃, adding 3.0% of PR, rotating for 30 minutes, adding 3.0% of TSP, 2.0% of PMB, 2.5% of DLF, 1.0% of OT, 0.5% of BA, rotating for 40 minutes, adding 1-3% of dye, 1.0% of OT, 3.0% of FS, 2.0% of TA, 3.0% of SG, and 3.0% of OXT, rotating for 60 minutes, checking the dye permeation condition, supplementing 70% of hot water after the dye is completely permeated, adjusting the internal temperature to be about 45 ℃, adding 0.7% of formic acid, adding formic acid twice, adding half of the formic acid each time, adding the first time of rotation for 10 minutes, adding the second time of rotation for 20 minutes, measuring the pH value to be 4.0-4.2, draining, and washing for 1 time; the step S10: adding water with the weight of 200% of blue leather into a rotary drum, controlling the internal temperature to be 52-55 ℃, adding 1.5% CCL, rotating for 20 minutes, adding 3.0% BA, 1.5% E123, 3.0% SU-10 and 3.0% 94S, emulsifying and mixing the fatting agent by hot water with the temperature of 55-60 ℃, rotating for 60 minutes, adding 1.5% TSP, rotating for 30 minutes, adding 2.0% formic acid, diluting, adding twice, and adding at an interval of 30min each time; the step S11: the fixation process requiring surface dyeing is as follows: adding 300% of water, controlling the internal temperature to be 45-48 ℃, adding 1-3% of fully-opened dye, rotating for 15 minutes, adding 0.5% of formic acid, rotating for 20 minutes, checking the color, adding 0.5% of formic acid after the color meets the requirement, rotating for 20 minutes, adding 0.3% of color fixing agent AL, rotating for 20 minutes, adding 0.5% of GS (soluble polysaccharide) and 0.3% of neat foot oil OPB (isopropyl-beta-hydroxy) of cationic fatting agent, rotating for 15 minutes, draining, and washing with water; if no surface dyeing is needed, the fixation process is as follows: adding 300% of water, controlling the internal temperature to be 45-48 ℃, adding 0.5% of formic acid, rotating for 20 minutes, adding 0.3% of color fixing agent AL, rotating for 20 minutes, adding 0.5% of GS (yellow soil) and 0.3% of neat foot oil OPB (isopropyl-beta-hydroxy) of cationic fatting agent, rotating for 15 minutes, draining, and washing with water; the step S12: placing the leather blank cured in the step S12 on a reciprocating type squeezing and stretching machine, squeezing and stretching the leather blank by adopting a two-knife method, wherein stretching and stretching are required, the whole leather blank is smooth and has no dead fold, after stretching, the moisture of the leather blank is preferably controlled to be 45-50%, and after stretching, the leather blank is placed and is flattened; the step S13: spreading the crust leather meat surface on a plate by adopting a low-temperature vacuum machine, forcibly pushing the crust leather to be whole, wherein the vacuum degree is 0.06MPa, the temperature is 43-45 ℃, the time is 120-45 seconds, after vacuum drying, the water content of the leather blank is controlled to be 40-45%, the crust leather after vacuum is placed flatly and stands for 3-5 hours; the step S14: controlling the hanging and airing temperature at 38-42 ℃, and hanging and airing until the crust leather has 10-14% of water content and is uniform integrally; the step S15: the dried leather is hung and dried, cooled to normal temperature, then normal-temperature water is uniformly sprayed on the flesh side of the dry base leather by a moisture regaining machine, covered tightly by a plastic film and kept stand for 12-18 h, and after moisture regaining, the moisture content of the leather is controlled at 14-16%; the step S16: the damp crust leather can be softened by using a softening machine, and meanwhile, the crust leather is vibrated up and down and the periphery of the crust leather is softened; the step S17: putting the leather blank after being softened into a stainless steel softening rotary drum, and softening and falling for 6-8 hours; the step S18: placing the soft and fallen leather blanks on an automatic plate stretching machine for plate stretching operation, wherein the clamping distance is controlled to be 8-10 cm, the plate stretching distance is 1-3 cm, and the plate stretching time is 20-30 minutes; the step S19: after the step S18 of toggling, trimming the crust leather, trimming useless corners, dead folds, burnt edges and rough edges of the follow-up leather making, and keeping the leather shape complete; the step S20: when coating, the coating agent can be selected from polyacrylic acid and polyurethane film forming agent, casein, wax agent and hand feeling agent; according to the method for producing the cowhide upper leather for the dancing shoes, by improving a cowhide production process, in order to improve the applicability of the product process, production raw materials do not start from fur alone, conventional upper leather blue is selected as a raw material, domestic blue or imported blue with different roads can be selected according to product positioning, and the softness of a finished product is improved by adopting a method of multiple times of neutralization and step-by-step oiling; selecting a synthetic retanning filler without formaldehyde on a filling material, improving the fullness of the leather, reducing the position difference and making the leather soft but not loose; the modified glutaraldehyde is matched with tannin for retanning, so that the air permeability and the sweat resistance of a finished product are improved; in view of the particularity of the dance shoe, a proper amount of hyperbranched polymer with a deodorization function is added in the filling process, so that the finished leather has good sanitary performance, and the leather produced by the method is good in air permeability and sweat resistance, soft and comfortable in texture and free of stimulation to skin through green environment-friendly chemical materials and a clean production process, and can be used as a dance shoe upper material.