Preparation process of regenerated cowhide fiber blended yarn

Abstract

The invention discloses a preparation technology of regenerated cowhide fiber blended yarn. The preparation technology comprises the following steps of preparation of regenerated cowhide fibers, preparation of blended yarn and yarn aftertreatment. The preparation of the regenerated cowhide fiber comprises biological enzyme softening and cowhide fiber modification; the preparation method of the blended yarn comprises the steps of pretreatment of fibers, opening and mixing, carding, drawing, roving and spinning. The post-treatment of the yarns is that the prepared blended yarns are placed in a post-treatment solution; the post-treatment solution is prepared from chitosan and polydimethylsiloxane. According to the preparation technology of the regenerated cowhide fiber blended yarn, biological enzyme softening and modification are carried out in the preparation process of the regenerated cowhide fibers, so that the prepared regenerated cowhide fibers have softness, and the cohesive force between the regenerated cowhide fibers and other fibers is improved.

Description

Technical Field

[0001] The invention relates to a preparation process of a regenerated cowhide fiber blended yarn, and belongs to the technical field of regenerated cowhide fiber yarn preparation. Background Art

[0002] Cowhide scraps are an inevitable waste product during the production of leather products. Cowhide leather is primarily composed of interwoven and intertwined bundles and microbundles of collagen fibers. Cowhide scraps can be processed to produce regenerated cowhide fiber. However, due to its short length, coarse fibers, and rough feel, regenerated cowhide fiber is difficult to spin alone into yarn. Therefore, it must be blended with other fibers for spinning. Improving the feel and strength of regenerated cowhide fiber blended yarns has become a challenge. Summary of the Invention

[0003] The purpose of the present invention is to provide a preparation process of regenerated cowhide fiber blended yarn, which can improve the feel and strength of the blended yarn.

[0004] In order to solve the above-mentioned technical problems, the purpose of the present invention is achieved as follows: The present invention relates to a process for preparing a regenerated cowhide fiber blended yarn, comprising the following steps: preparing the regenerated cowhide fiber, preparing the blended yarn, and post-processing the yarn; The preparation of the regenerated cowhide fiber includes biological enzyme softening and modification of the cowhide fiber; The preparation of the blended yarn includes fiber pretreatment, opening and mixing, carding, drawing, spun spinning and spinning; The post-treatment of the yarn is to place the prepared blended yarn in a post-treatment solution, soak it at 40-45°C for 30-45 minutes, take it out and dry it; The post-treatment solution comprises chitosan and polydimethylsiloxane.

[0005] On the basis of the above scheme and as a preferred scheme of the above scheme: the pretreatment of the fiber is to spray the regenerated cowhide fiber with an antistatic solution and then leave it for 1-2 hours; The opening and mixing: regenerated cowhide fiber and cotton fiber are mixed in proportion, enter the multi-bin cotton mixer for uniform mixing, and then enter the cotton opener for ball opening and mixing; The carding is carried out using a double-cylinder double-doffer carding machine, the speed of the first cylinder is 280-320 rpm, the speed of the second cylinder is 420-480 rpm; the gauge is 0.12-0.18 mm.

[0006] On the basis of the above solution and as a preferred solution of the above solution: the drawing comprises a head drawing and a tail drawing; The Rieter SB-D50 draw frame was used as the head draw frame, with 6 draw frames and a draft ratio of 5.87. To increase sliver uniformity and improve spinnability, the sliver weight was 23g / 5m, and the back zone draft ratio was 1.7. The roller center distance was 44mm × 54mm, the delivery speed was 400m / min, the temperature was 29°C, and the relative humidity was 56%. The Rieter RSB-D50 is equipped with an autoleveler draw frame as the final draw frame, with a draw number of 6 and a sliver weight of 20g / 5m; total draft ratio: 6.95; back zone draft ratio: 1.3; roller center distance: 44mm×54mm; sliver delivery speed: 350m / min; temperature: 27℃, relative humidity: 54%.

[0007] Based on the above scheme and as a preferred scheme of the above scheme: in the roving process, the roving basis weight is 4.8g / 10m, the roving twist coefficient is 85, the roving spindle speed is 1000r / min; the roller diameter is 28.5mm, the roller center distance is 41mm×53mm×60mm; the total draft ratio is 8.3 times, the back zone draft ratio is 1.19; the temperature is 28°C, and the relative humidity is 57%; The spinning process used a Rieter G32 equipped with Suessen compact spinning; the spindle speed was 17,500 r / min; the twist was 1,142 twists / m; the roller center distance was 42.5 mm × 70 mm; the gauge was 2.5 + pressure bar; the wire traveler was Bracker E3 / 289-1 udr 9 / 0; the steel ring was PG1 3854; the temperature was 31°C and the relative humidity was 52%.

[0008] On the basis of the above solution and as a preferred solution of the above solution: the preparation of the regenerated cowhide fiber comprises the following steps: (a) Screening, color separation and impurity removal of cowhide scraps; (b) Enzyme softening: Leather scraps of the same color and layer are immersed in a softening solution containing a penetrant, a bulking agent, a protease, and a lipase for the first time; the pH value of the softening solution is 8-9; (c) extruding the softened cowhide scraps using a hydraulic press, wherein the water content of the extruded cowhide scraps is 20-30%; (d) repeatedly soaking and squeezing the squeezed cowhide scraps according to steps (b) and (c), and the total number of repetitions does not exceed 5 times; (e) separating the cowhide scraps obtained in step (d) by high pressure steaming to obtain cowhide fibers; (f) placing the kraft fiber formed in step (e) in a modification treatment solution comprising 3-8% aqueous polyurethane, 1-3% silane coupling agent, and 0.5-1% glycerol, and shaking at 60-65° C. for 30-45 minutes; (g) Drying the modified cowhide fiber to obtain regenerated cowhide fiber.

[0009] On the basis of the above solution and as a preferred solution of the above solution: the mass fraction of the chitosan is 1-3%, and the mass fraction of the polydimethylsiloxane is 2-5%.

[0010] The beneficial effects of the present invention are as follows: the present invention relates to a process for preparing a regenerated cowhide fiber blended yarn, in which biological enzyme softening and modification are performed during the preparation of the regenerated cowhide fiber, so that the prepared regenerated cowhide fiber has softness and improves its cohesion with other fibers. DETAILED DESCRIPTION

[0011] The present invention is further described below with reference to specific embodiments.

[0012] Example 1 The present embodiment involves a process for preparing a regenerated cowhide fiber blended yarn, comprising the following steps: preparing the regenerated cowhide fiber, preparing the blended yarn, and post-processing the yarn.

[0013] The preparation of the regenerated cowhide fiber includes biological enzyme softening and modification of the cowhide fiber; the preparation of the blended yarn includes fiber pretreatment, opening and mixing, carding, drawing, spun spinning and spinning; the post-treatment of the yarn is to place the prepared blended yarn in a post-treatment solution, soak it at 40-45°C for 30-45 minutes, take it out and dry it; the post-treatment solution includes chitosan and polydimethylsiloxane.

[0014] Furthermore, the preparation of the regenerated cowhide fiber includes the following steps: (a) Screen, color-separate, and remove impurities from the cowhide scraps. Remove dust, mechanical impurities, and other non-genuine leather debris.

[0015] (b) Bio-enzyme softening: cowhide scraps of the same color and layer are immersed in a softening solution containing a penetrant, a swelling agent, a protease and a lipase for the first time; the pH value of the softening solution is 8-9, and in this embodiment, it is selected as 8.5.

[0016] Furthermore, the mass fractions of the penetrant, bulking agent, protease, and lipase in the softening solution are 2%, 5%, 2%, and 1%, respectively. The specific penetrant is penetrant JFC, and the bulking agent is fatty alcohol polyoxyethylene ether.

[0017] (c) The softened cowhide scraps are squeezed using a hydraulic press, wherein the water content of the squeezed cowhide scraps is 20-30%.

[0018] (d) Repeating the soaking and squeezing of the squeezed cowhide scraps according to steps (b) and (c) in sequence, with the total number of repetitions not exceeding 5 times, specifically 3 times in this embodiment.

[0019] (e) Separating the cowhide fibers from the cowhide scraps obtained in step (d) by high-pressure steaming.

[0020] (f) The kraft fiber formed in step (e) is placed in a modification solution comprising 3-8% aqueous polyurethane, 1-3% silane coupling agent, and 0.5-1% glycerol, and subjected to shaking at 60-65° C. for 30-45 minutes. Specifically, in this embodiment, the modification solution comprises 5% aqueous polyurethane, 2% silane coupling agent, and 0.8% glycerol.

[0021] (g) drying the modified cowhide fiber to obtain regenerated cowhide fiber at a drying temperature of 60-80°C.

[0022] Furthermore, the fiber pretreatment comprises spraying the regenerated cowhide fiber with an antistatic solution at a spraying amount of 0.2% of the weight of the regenerated cowhide fiber and then leaving it for 1-2 hours. The antistatic solution contains 1% of an antistatic agent, which is octadecyl dimethyl hydroxyethyl quaternary ammonium nitrate.

[0023] The opening and mixing is as follows: the regenerated cowhide fiber and the cotton fiber are mixed in a ratio of 50:50, the fibers are fed into a multi-bin cotton mixer for uniform mixing, and then fed into a cotton opener for ball opening and mixing.

[0024] The carding is performed using a double-cylinder double-doffer carding machine, with the speed of the first cylinder being 280-320 rpm, the speed of the second cylinder being 420-480 rpm, and the gauge being 0.12-0.18 mm. Specifically, in this embodiment, the speed of the first cylinder is 300 rpm, the speed of the second cylinder is 460 rpm, and the gauge is 0.12-0.18 mm.

[0025] Furthermore, the drawing includes the first drawing and the last drawing.

[0026] The Rieter SB-D50 draw frame is used as the head draw frame, with 6 draw frames and a draft ratio of 5.87. In order to increase the uniformity of the sliver and improve the spinnability, the sliver weight is 23g / 5m, the draft ratio in the back zone is 1.7; the roller center distance is 44mm×54mm; the sliver delivery speed is 400m / min; the temperature is 29℃, and the relative humidity is 56%.

[0027] The Rieter RSB-D50 is equipped with an autoleveler draw frame as the final draw frame, with a draw number of 6 and a sliver weight of 20g / 5m; total draft ratio: 6.95; back zone draft ratio: 1.3; roller center distance: 44mm×54mm; sliver delivery speed: 350m / min; temperature: 27℃, relative humidity: 54%.

[0028] Furthermore, in the roving process, the roving weight is 4.8 g / 10 m, the roving twist coefficient is 85, the roving spindle speed is 1000 r / min; the roller diameter is 28.5 mm, the roller center distance is 41 mm × 53 mm × 60 mm; the total draft ratio is 8.3 times, the back zone draft ratio is 1.19; the temperature is 28 ° C, and the relative humidity is 57%; The spinning process used a Rieter G32 equipped with a Suessen compact spinning machine; the spindle speed was 17,500 r / min; the twist was 1,142 twists / m; the roller center distance was 42.5 mm × 70 mm; the gauge was 2.5 mm + pressure bar; the traveler was a Bracker E3 / 289-1 UDR 9 / 0; and the ring was a PG1 3854. The temperature was 31°C and the relative humidity was 52%. The yarn fineness was 20 count.

[0029] Furthermore, the mass fraction of the chitosan is 1-3%, and the mass fraction of the polydimethylsiloxane is 2-5%. In this embodiment, the mass fractions are 2% and 4%, respectively.

[0030] Comparative Example This comparative example differs from Example 1 in that the softening stage of the regenerated cowhide fiber production process involves placing cowhide scraps of the same color and texture in an aqueous solution containing a penetrant, a bulking agent, and sodium hydroxide. Per 100 kg of water, the solution contains 5-15 kg of penetrant, 3-13 kg of bulking agent, and 0.5-3 kg of sodium hydroxide. Neither the modification nor the yarn post-treatment steps are included. The resulting yarn has a count of 20.

[0031] The yarns prepared in Example 1 and the comparative example were tested, and the strengths were 18.6 cN / dtex and 12.2 cN / dtex, respectively, and the yarn unevenness CV (%) was 10.6 and 15.9, respectively.

[0032] The above describes in detail the preferred embodiments of the present invention. It should be understood that those skilled in the art can make numerous modifications and variations based on the concepts of the present invention without inventive effort. Therefore, any technical solutions that can be derived by those skilled in the art through logical analysis, reasoning, or limited experimentation based on the concepts of the present invention and the prior art should be within the scope of protection defined by the claims.

Claims

1. A process for preparing regenerated cowhide fiber blended yarn, characterized in that: The method comprises the following steps: preparing regenerated cowhide fiber, preparing blended yarn and post-processing the yarn; The preparation of the regenerated cowhide fiber includes biological enzyme softening and modification of the cowhide fiber; The preparation of the blended yarn includes fiber pretreatment, opening and mixing, carding, drawing, spun spinning and spinning; The post-treatment of the yarn is to place the prepared blended yarn in a post-treatment solution, soak it at 40-45°C for 30-45 minutes, take it out and dry it; The post-treatment solution comprises chitosan and polydimethylsiloxane.

2. The process for preparing regenerated cowhide fiber blended yarn according to claim 1, characterized in that: The fiber pretreatment is to spray the regenerated cowhide fiber with an antistatic solution and then leave it for 1-2 hours; The opening and mixing: regenerated cowhide fiber and cotton fiber are mixed in proportion, enter the multi-bin cotton mixer for uniform mixing, and then enter the cotton opener for ball opening and mixing; The carding is carried out using a double-cylinder double-doffer carding machine, the speed of the first cylinder is 280-320 rpm, the speed of the second cylinder is 420-480 rpm; the gauge is 0.12-0.18 mm.

3. The process for preparing regenerated cowhide fiber blended yarn according to claim 1, characterized in that: The drawing comprises a head drawing and a tail drawing; The Rieter SB-D50 draw frame was used as the head draw frame, with 6 draw frames and a draft ratio of 5.

87. To increase sliver uniformity and improve spinnability, the sliver weight was 23g / 5m, and the back zone draft ratio was 1.

7. The roller center distance was 44mm × 54mm, the delivery speed was 400m / min, the temperature was 29°C, and the relative humidity was 56%. The Rieter RSB-D50 is equipped with an autoleveler draw frame as the final draw frame, with a draw number of 6 and a sliver weight of 20g / 5m; total draft ratio: 6.95; back zone draft ratio: 1.3; roller center distance: 44mm×54mm; sliver delivery speed: 350m / min; temperature: 27℃, relative humidity: 54%.

4. The process for preparing regenerated cowhide fiber blended yarn according to claim 1, characterized in that: In the roving process, the roving weight is 4.8g / 10m, the roving twist coefficient is 85, the roving spindle speed is 1000r / min; the roller diameter is 28.5mm, the roller center distance is 41mm×53mm×60mm; the total draft ratio is 8.3 times, the back zone draft ratio is 1.19; the temperature is 28℃, and the relative humidity is 57%; The spinning process used a Rieter G32 equipped with a Suessen compact spinning machine; the spindle speed was 17,500 r / min; the twist was 1,142 twists / m; the roller center distance was 42.5 mm × 70 mm; the gauge was 2.5 + pressure bar; the wire traveler was Bracker E3 / 289-1 udr 9 / 0; the steel ring was PG13854; the temperature was 31°C and the relative humidity was 52%.

5. The process for preparing regenerated cowhide fiber blended yarn according to claim 1, characterized in that: The preparation of the regenerated cowhide fiber comprises the following steps: (a) Screening, color separation and impurity removal of cowhide scraps; (b) Enzyme softening: Leather scraps of the same color and layer are immersed in a softening solution containing a penetrant, a bulking agent, a protease, and a lipase for the first time; the pH value of the softening solution is 8-9; (c) extruding the softened cowhide scraps using a hydraulic press, wherein the water content of the extruded cowhide scraps is 20-30%; (d) repeatedly soaking and squeezing the squeezed cowhide scraps according to steps (b) and (c), and the total number of repetitions does not exceed 5 times; (e) separating the cowhide scraps obtained in step (d) by high pressure steaming to obtain cowhide fibers; (f) placing the kraft fiber formed in step (e) in a modification treatment solution comprising 3-8% aqueous polyurethane, 1-3% silane coupling agent, and 0.5-1% glycerol, and shaking at 60-65° C. for 30-45 minutes; (g) Drying the modified cowhide fiber to obtain regenerated cowhide fiber.

6. The process for preparing regenerated cowhide fiber blended yarn according to claim 1, characterized in that: The mass fraction of the chitosan is 1-3%, and the mass fraction of the polydimethylsiloxane is 2-5%.