Regenerated cowhide fiber environment-friendly leather as well as production line and production process thereof

Abstract

The invention relates to the technical field of fabrics, in particular to regenerated cowhide fiber environment-friendly leather as well as a production line and a production process thereof, in a cowhide fiber surface layer and a cowhide fiber bottom layer, regenerated cowhide fibers are taken as a main body, and the cowhide fibers and base cloth are subjected to spunlace, so that the degree of crosslinking is very high; the durability of the regenerated cowhide fiber environment-friendly leather is improved, the hand feeling of the produced regenerated cowhide fiber environment-friendly leather is close to that of genuine leather, the produced regenerated cowhide fiber environment-friendly leather has good tearing strength and tensile property, and the problem that the utilization rate of traditional genuine leather is low due to irregularity, sheet size, surface wounds and other natural limitations is solved; the length of the regenerated leather can be provided according to product requirements, and various colors and lines can be customized according to customer requirements.

Description

Technical Field

[0001] The invention relates to the technical field of fabrics, and in particular to regenerated cowhide fiber environmentally friendly leather and a production line and a production process thereof. Background Art

[0002] In the field of leather manufacturing, traditional genuine leather has long been widely used in many industries due to its good texture and performance. However, since the source of genuine leather is mainly animal skin, there are many limiting factors. On the one hand, genuine leather has irregularities and limited width, and is prone to natural defects such as trauma on the surface, which leads to its low utilization rate. On the other hand, the color and texture of genuine leather are relatively fixed, and it is difficult to customize according to the diverse needs of customers, which limits its application scope to a certain extent. In order to solve these problems of traditional genuine leather, recycled leather technology came into being. Among the common recycled leather technologies currently available, some are through simple velveting and fiberizing of cowhide waste, and then compounding with other fibers or materials. At the same time, in terms of the selection and use of base fabrics, ordinary fabric base fabrics are more common. When these base fabrics are compounded with cowhide fibers, they mainly rely on simple physical bonding or a small amount of chemical cross-linking. The base fabrics usually adopt a single yarn structure. The cross-linking and connection methods between the yarns are relatively simple, and it is difficult to form a high-strength bonding effect when compounded with cowhide fibers. The water-jet cross-linking density is low, which affects the bonding strength and overall performance between the leather layers. In view of this, this case arises. Summary of the invention

[0003] One object of the present invention is to solve at least the above-mentioned problems through regenerated cowhide fiber environmentally friendly leather and its production line and production process.

[0004] In order to solve the above technical problems, the technical solution adopted by the present invention is as follows: the regenerated cowhide fiber environmentally friendly leather includes a cowhide fiber surface layer, a double suede base fabric layer and a cowhide fiber bottom layer from top to bottom, and the upper and lower surfaces of the double suede base fabric layer are distributed with fluff, and the cowhide fibers of the cowhide fiber surface layer and the cowhide fiber bottom layer are cross-linked with the yarn fibers and fluff fibers of the double suede base fabric layer.

[0005] Preferably, the fabric structure of the double suede base fabric layer is a binding warp-bonded double-layer structure, in which the surface warp and the surface weft are interwoven into the base fabric surface layer, and the inner warp and the inner weft are interwoven into the base fabric inner layer, and the binding warp is interwoven with the surface weft and the inner weft at the same time, so that the base fabric surface layer and the base fabric inner layer are connected to each other.

[0006] Preferably, in the binding warp binding double-layer structure, the surface structure is a two-up and two-down right twill structure, the lining structure is a one-up and three-down right twill structure, the warp yarns are arranged in the order of one surface warp, one lining warp and one binding warp, and the weft yarns are arranged in the order of one surface weft and one lining weft.

[0007] Preferably, the surface warp and the inner warp are island yarns, the island yarns are composited by island yarns and high shrinkage yarns through network processing, the island yarns are composited by spinning the sea component covering the island component, the sea component is low-viscosity PET, the island component is PBT / IPA copolymer, the high shrinkage yarn is modified PET, the connecting warp is high-strength PA66 filament, and the surface weft and the inner weft are modified PA6 staple yarns.

[0008] Preferably, the raw materials of the island-in-the-sea yarn include the following components in parts by weight: 65-70 parts of low-viscosity PET, 35-40 parts of PBT / IPA copolymer, 30-35 parts of modified PET, and 0.6-0.8 parts of network oil.

[0009] Preferably, the slurry of the cowhide fiber surface layer and the cowhide fiber bottom layer comprises the following components in parts by weight: 90-100 parts of regenerated cowhide fiber, 5-8 parts of plant fiber, 8-10 parts of temperature-sensitive hydrogel fiber, 3-5 parts of nanocellulose whiskers, and 5-8 parts of waterborne polyurethane.

[0010] The production line of the above-mentioned regenerated cowhide fiber environmentally friendly leather includes an inclined wire papermaking machine, a base fabric unwinding machine, a base fabric belt conveyor, a composite belt conveyor, a hydroentanglement device and a drying device. The inclined wire papermaking machines are provided with two, the base fabric unwinding machine is located at the front end of the base fabric belt conveyor, the hydroentanglement device and the drying device are arranged in sequence at the rear end of the composite belt conveyor, and a carding machine is provided at the end of the base fabric belt conveyor. The carding machine is provided with relatively arranged upper comb tooth rollers and lower comb tooth rollers, followed by relatively arranged upper air knives and lower suction rollers, and finally relatively arranged upper ion wind rods and lower ion wind rods.

[0011] The production process of the above-mentioned regenerated cowhide fiber environmentally friendly leather comprises the following steps: Step a, preparing a double suede base fabric; Step b, the pulp is made into kraft fiber material by an inclined wire papermaking machine; Step c, unwinding the prefabricated double suede base fabric through a base fabric unwinding machine; Step d, the double suede base fabric is conveyed by a base fabric belt conveyor and sandwiched between the kraft fiber materials produced by two inclined wire papermaking machines, and finally stacked on a composite belt conveyor to form a sandwich structure fabric; Step e, the fabric enters the spunlace device, and the cowhide fiber surface layer, the double suede base fabric layer and the cowhide fiber bottom layer are spunlace composited by the spunlace machine; Step f, the composite substrate after spunlacing is sequentially subjected to rolling drying, drum drying, removal of harmful substances and rotary screen drying, and finally rolled up.

[0012] Preferably, the preparation process of the double suede base fabric is as follows: Step a, preparing sea-island yarn; Step b, weaving a base fabric with a double-layer structure; Step c, alkali treatment: 10% NaOH solution is used for alkali treatment at 90°C for 30 minutes; Step d, double-sided sanding: double-sided sanding is performed using a ceramic sanding disc at a rotation speed of 1500 rpm and a pressure of 0.15 MPa.

[0013] Preferably, the preparation process of the island-in-the-sea yarn is as follows: after the sea component slices and the island component slices are melted, the island-in-the-sea yarns with a 16-island structure are formed through an island-in-the-sea spinneret; the island-in-the-sea yarns and the high shrinkage yarns are networked in proportion to synthesize the island-in-the-sea yarns, and are treated with a polyether network oil agent.

[0014] From the above description, it can be seen that the regenerated cowhide fiber environmentally friendly leather and its production line and production process provided by the present invention have the following beneficial effects: regenerated cowhide fiber is obtained by beating and defibrillating cowhide waste, and the regenerated cowhide fiber is mainly in the cowhide fiber surface layer and the cowhide fiber bottom layer. Therefore, the regenerated cowhide fiber environmentally friendly leather produced has a feel close to that of genuine leather and has good tear strength and tensile properties, which solves the problem of low utilization rate of traditional genuine leather due to natural limitations such as irregularity and width, as well as surface trauma. The regenerated leather can be provided in length according to product requirements, and can be customized in various colors and textures according to customer needs. The road breaks through the limitations of genuine leather color and texture. The added temperature-sensitive hydrogel fiber can automatically adjust the gap between the fiber layers according to the ambient humidity, giving the material self-regulating air permeability. There is fluff on both the upper and lower sides of the base fabric. The evenly distributed fluff structure can greatly increase the cross-linking degree between the base fabric layer and the cowhide fiber during hydroentanglement, thereby improving the bonding strength of each layer of the composite fabric. The double suede base fabric layer has both the tensile strength of woven fabrics and the strong cross-linking of non-woven fabrics, which makes the regenerated cowhide fiber environmentally friendly leather have high lateral tensile strength and longitudinal bonding, thereby improving the durability of the regenerated cowhide fiber environmentally friendly leather. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 Schematic diagram of the structure of recycled cowhide fiber environmentally friendly leather.

[0016] Figure 2 This is the fabric structure diagram of the double suede base fabric layer.

[0017] Figure 3 It is a warp cross-section view of the double suede base fabric layer.

[0018] Figure 4 This is a schematic diagram of the structure of the production line for recycled cowhide fiber environmentally friendly leather.

[0019] Figure 5 It is a structural schematic diagram of a carding machine. DETAILED DESCRIPTION

[0020] The present invention is further described below through specific implementation modes.

[0021] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further explained below in conjunction with specific implementation methods.

[0022] like Figure 1 As shown, the regenerated cowhide fiber environmentally friendly leather of the present invention includes, from top to bottom, a cowhide fiber surface layer 10, a double suede base fabric layer 20 and a cowhide fiber bottom layer 30, and the upper and lower surfaces of the double suede base fabric layer 20 are both distributed with fluff, and the cowhide fibers of the cowhide fiber surface layer 10 and the cowhide fiber bottom layer 30 are cross-linked with the yarn fibers and fluff fibers of the double suede base fabric layer 20. The base fabric introduced in the present invention is distributed with fluff on both the upper and lower surfaces, and the evenly distributed fluff structure can greatly improve the cross-linking degree between the base fabric layer and the cowhide fibers during hydroentanglement, thereby improving the bonding strength of each layer of the composite fabric. The double suede base fabric layer 20 has both the tensile strength of woven fabrics and the strong cross-linking property of non-woven fabrics, so that the regenerated cowhide fiber environmentally friendly leather has both high transverse tensile strength and longitudinal bonding, thereby improving the durability of the regenerated cowhide fiber environmentally friendly leather.

[0023] The fabric structure of the double-pile base fabric layer 20 is a double-layer structure with a binding warp binding. In the binding warp binding double-layer structure, the surface warp and the surface weft are interwoven into the surface layer of the base fabric, and the inner warp and the inner weft are interwoven into the inner layer of the base fabric. The binding warp is interwoven with the surface weft and the inner weft at the same time, so that the surface layer of the base fabric and the inner layer of the base fabric are connected to each other. The double-pile base fabric layer 20 using this fabric structure has a double-layer fabric structure, so that the base fabric can be piled on both sides while ensuring sufficient strength. Since the binding warp fiber material is different from the surface warp and the inner warp, alkali dissolution will not occur, and the binding warp is hidden between the surface layer and the inner layer, connecting the two layers together, and no physical changes will occur during the napping process, which can ensure the connection strength of the surface layer and the inner layer.

[0024] In the double-layer weave of the binding warp, the surface weave is a right twill weave with two upper and two lower layers, and the inner weave is a right twill weave with one upper and three lower layers. The warp yarns are arranged in the order of one surface warp, one inner warp, and one binding warp, and the weft yarns are arranged in the order of one surface weft and one inner weft. Figure 2 The figure shows the fabric structure on the loom. The Chinese numbers 1, 2, 3, and 4 in the figure represent the surface warp and surface weft, the Roman numerals Ⅰ, Ⅱ, Ⅲ, and Ⅳ represent the inner warp and inner weft, and the letters a, b, c, and d represent the connecting warp. The surface warp and the surface weft are interwoven at the surface structure symbol "★", and the inner warp and the inner weft are interwoven at the inner structure symbol "☆". The connecting symbol is "Δ", and the heald lifting symbol is "0". "□" means that the surface warp is not lifted when the inner weft is inserted. Figure 3The figure shows a warp cross section. The binding warp a is interwoven with the surface weft II and the inner weft III respectively. It is composed of two systems of yarns. The binding warp is hidden between the surface layer and the inner layer, connecting the two layers together. The structure is stable and the service life of the fabric is improved. Figure 3 As shown, after alkali treatment and sanding, fluff is formed on the inner and outer warp floating lines.

[0025] The surface warp and the inner warp are island yarns. The island yarns are made of island yarns and high shrinkage yarns through network processing. The island yarns are made of the sea component covering the island component through composite spinning. The sea component is low-viscosity PET, the island component is PBT / IPA copolymer, the high shrinkage yarn is modified PET, the binding warp is high-strength PA66 filament, and the surface weft and the inner weft are modified PA6 staple yarns. The low-viscosity PET used in the sea component has excellent alkali solubility and a characteristic viscosity of 0.60dL / g. It is used as a continuous phase to wrap the island component and form villi gaps after dissolution. The dissolution rate is ≥98% at 10% NaOH, 90℃, and 30min; the PBT / IPA used in the island component is 100% PET, which is 0.60dL / g. Copolymer, resistant to alkali hydrolysis, strength retention rate after alkali treatment ≥95%, forming 16-petal radial ultrafine fibers, diameter 1-2μm, specific surface area 6-8m² / g, enhanced water-spunlace cross-linking anchoring points; high shrinkage yarn uses modified PET, preferably modified polyethylene terephthalate copolymer, 8% isophthalic acid is added to the PET matrix as a comonomer to increase the shrinkage rate, 0.5% triphenyl phosphite is added as a heat stabilizer to inhibit thermal oxidative degradation during high-temperature shrinkage treatment, 1% nano-silica is added as an alkali additive, dispersed in the PET matrix to form an alkali-resistant barrier, improve alkali resistance, after copolymerization modification, dip-coated with 0.3% fluorocarbon resin solution to form an alkali-resistant coating, and the alkali solution adsorption is reduced by 40%. The percentages above and below are all weight percentages. The single fiber fineness is 75dtex / 36f, the cross-section is round, the boiling water shrinkage rate is 38%, and the floating long line of the island yarn is pulled during shrinkage Bending occurs, providing mechanical tension for the formation of fluff, and also has good alkali resistance and stability; the island yarn floats on the upper and lower surfaces of the base fabric in the form of floating long lines. After being treated with alkali solution, the shaping state of the high shrinkage yarn will be broken, resulting in shrinkage. Subsequently, the sea component of the island yarn dissolves as a continuous phase, and the island fibrils are wrapped around the high shrinkage yarn in a relaxed state. These island fibrils are composed of ultrafine fibers with extremely fine fiber diameters. They break after being sanded, thereby forming numerous delicate and uniform fluff clusters on the inner and outer surfaces of the base fabric. The fluff clusters can effectively improve the connection strength with the cowhide fiber. After testing, the regenerated cowhide fiber environmentally friendly leather made of double suede base fabric has a fluff density of 3000 roots / cm², which is compared with the regenerated cowhide fiber leather made of ordinary fabric tissue base fabric, such as plain or twill tissue base fabric. The hydroentanglement cross-linking point is greatly improved. After SEM cross-section observation, the hydroentanglement cross-linking depth is doubled, the interlayer peeling strength is increased by 30-40%, and the interlayer peeling strength is ≥80N / cm. The binding warp is hidden between the double-layer base fabric to reduce contact with alkali solution. The high-strength PA66 filament and modified PA6 staple yarn are dipped in fluorocarbon resin solution to form an alkali-resistant coating, which reduces the amount of alkali solution adsorption and improves alkali resistance.

[0026] The raw materials of the island yarn include the following components by weight: 65-70 parts of low-viscosity PET, 35-40 parts of PBT / IPA copolymer, 30-35 parts of modified PET, and 0.6-0.8 parts of network oil. The network oil adopts a polyether network agent with a molecular weight of 5000 and a friction coefficient of ≤0.25, which enhances the cohesion of the island yarn and the high shrinkage yarn, avoids fiber slippage during sanding, and imparts antistatic properties.

[0027] The slurry of the cowhide fiber surface layer 10 and the cowhide fiber bottom layer 30 includes the following components in parts by weight: 90-100 parts of regenerated cowhide fiber, 5-8 parts of plant fiber, 8-10 parts of thermosensitive hydrogel fiber, 3-5 parts of nanocellulose whiskers, and 5-8 parts of waterborne polyurethane. Among the components, the regenerated cowhide fiber is obtained by beating and defibrillating the cowhide waste. The regenerated cowhide fiber is the main component in the cowhide fiber surface layer 10 and the cowhide fiber bottom layer 30. Therefore, the produced regenerated cowhide fiber environmentally friendly leather feels close to genuine leather and has good tear strength and tensile properties, which solves the problem of low utilization rate of traditional genuine leather due to natural limitations such as irregularity and width, as well as surface trauma. The regenerated leather can provide length according to product requirements, and can be customized in various colors and textures according to customer needs, breaking through the limitations of genuine leather color and texture; the plant fiber adopts bamboo pulp fiber to enhance flexibility and breathability; nanocellulose whiskers improve cross-linking density and tear resistance; waterborne polyurethane enhances interlayer bonding; thermosensitive water The gel fiber includes the following raw materials in parts by weight: 80-90 parts of N-isopropyl acrylamide, 1-3 parts of a cross-linking agent, 5-10 parts of a hydrophilic modified monomer, and 0.5-2 parts of a dispersant. N-isopropyl acrylamide (NIPAM) contains both a hydrophobic group (isopropyl) and a hydrophilic group (amide group), which can induce swelling or shrinkage through changes in environmental humidity, thereby adjusting the porosity of the fiber layer. The cross-linking agent adopts N,N'-methylenebisacrylamide (MBA) to construct a three-dimensional network structure and enhance the mechanical strength and shape stability of the fiber. The hydrophilic modified monomer adopts acrylamide (AM) or hydroxyethyl methacrylate (HEMA) to adjust the hygroscopic properties and improve the hydrophilicity and swelling degree. The dispersant adopts polyvinyl alcohol PVA. The raw material of the thermosensitive hydrogel fiber is prepared by polymerization reaction to obtain PNIPAM prepolymer, in which the PNIPAM (poly N-isopropylacrylamide) molecular chain is the main molecular chain of the PNIPAM prepolymer, which is then solidified into fiber through wet spinning or electrospinning process in a coagulation bath (such as ethanol aqueous solution), and then stretched and dried to obtain the thermosensitive hydrogel fiber. The added thermosensitive hydrogel fiber can automatically adjust the gap between the fiber layers according to the ambient humidity, giving the material self-adjusting air permeability and a dynamically responsive composite layer to the fabric. Due to its swelling-contraction characteristics, the thermosensitive hydrogel fiber can achieve a 200% air permeability adjustment range. Under low humidity (<40% RH): the hydrophobic groups of the PNIPAM molecular chain dominate the fiber contraction, the volume decreases by 25%-30%, the porosity of the fiber layer drops from 60% to 30%, and the air circulation resistance increases. Under high humidity (>60% RH): water molecules form hydrogen bonds with the PNIPAM hydrophilic groups (-CONH-), the fibers swell, the volume increases by 40%-50%, the porosity increases to 70%-80%, and the air permeability is significantly improved. Because the fluff clusters on the surface of the double suede base fabric form a three-dimensional air guide channel, the gap change effect of the thermosensitive fiber is amplified, so that the overall air permeability adjustment is improved.

[0028] like Figure 4 The production line of environmentally friendly leather made of recycled cowhide fiber comprises an inclined wire paper machine 1, a base fabric unwinding machine 2, a base fabric belt conveyor 3, a composite belt conveyor 4, a spunlace device and a drying device. Two inclined wire paper machines 1 are provided. The base fabric unwinding machine 2 is located at the front end of the base fabric belt conveyor 3. The spunlace device and the drying device are sequentially arranged at the rear end of the composite belt conveyor 4. A carding machine 5 is provided at the end of the base fabric belt conveyor 3. The base fabric combed by the carding machine 5 is combined with the cowhide fiber materials produced by the two inclined wire paper machines 1 and then enters the composite belt conveyor 4; the carding machine 5 is provided with an upper combing tooth roller 51 and a lower combing tooth roller 52 arranged oppositely, followed by an upper air knife 53 and a lower suction roller 54 arranged oppositely, and finally an upper ion wind rod 55 and a lower ion wind rod 56 arranged oppositely. The base fabric passes through the gap between the upper combing roller 51 and the lower combing roller 52, the gap between the upper air knife 53 and the lower suction roller 54, and the gap between the upper ion wind rod 55 and the lower ion wind rod 56 in turn. The upper combing roller 51 and the lower combing roller 52 comb the fluff, so that the fluff is transformed from clustered aggregation to single fiber dispersion. The upper air knife 53 blows away the surface fluff, and the lower suction roller 54 absorbs and straightens the bottom surface fluff to form a three-dimensional fluff structure that is symmetrical from top to bottom. The upper ion wind rod 55 and the lower ion wind rod 56 eliminate the static electricity of the fluff to prevent the fibers from agglomerating due to static electricity. By adding a double-sided combing roller group, double airflow dispersion, and electrostatic activation three-stage processing system at the rear end of the base fabric belt conveyor 3, efficient dispersion and orientation of the upper and lower fluff of the double-pile base fabric is achieved, solving the problems of fluff agglomeration and low penetration rate, and improving the crosslinking density of the spunlace.

[0029] The production process of recycled cowhide fiber environmentally friendly leather includes the following steps: Step a, preparing a double suede base fabric; Step b, the pulp is made into kraft fiber material by an inclined wire paper machine 1; Step c, unwinding the prefabricated double suede base fabric through a base fabric unwinding machine 2; Step d, the double suede base fabric is transported by the base fabric belt conveyor 3 and sandwiched between the kraft fiber materials produced by the two inclined wire papermaking machines 1, and finally stacked on the composite belt conveyor 4 to form a sandwich structure fabric; Step e, the fabric enters the spunlace device, and the cowhide fiber surface layer 10, the double suede base fabric layer 20 and the cowhide fiber bottom layer 30 are spunlace composited by the spunlace machine; Step f, the composite substrate after spunlacing is sequentially subjected to rolling drying, drum drying, removal of harmful substances and rotary screen drying, and finally rolled up.

[0030] The preparation process of double suede base fabric is as follows: Step a, preparing sea-island yarn; Step b, weaving a base fabric with a double-layer structure; Step c, alkali treatment: 10% NaOH solution is used for alkali treatment at 90°C for 30 minutes; Step d, double-sided sanding: double-sided sanding is performed using a ceramic sanding disc at a rotation speed of 1500 rpm and a pressure of 0.15 MPa.

[0031] The preparation process of the island-in-the-sea yarn is as follows: after the sea component slices and the island component slices are melted, the island-in-the-sea yarn with 16 island structures is formed through the island-in-the-sea spinneret; the island-in-the-sea yarn and the high shrinkage yarn are proportionally networked and synthesized into the island-in-the-sea yarn, and then treated with a polyether network oil. The network nozzle pressure is 0.6MPa, the concentration of the polyether network oil is 0.8%, and the dipping speed is 20m / min, ensuring that the fiber surface friction coefficient is ≤0.25.

[0032] The above are only some specific implementation methods of the present invention, but the design concept of the present invention is not limited thereto. Any non-substantial changes to the present invention using this concept shall be deemed as an infringement of the protection scope of the present invention.

Claims

1. Regenerated cowhide fiber environmentally friendly leather, characterized by: From top to bottom, it includes a cowhide fiber surface layer, a double suede base fabric layer and a cowhide fiber bottom layer. The upper and lower surfaces of the double suede base fabric layer are both distributed with fluff. The cowhide fibers of the cowhide fiber surface layer and the cowhide fiber bottom layer are cross-linked with the yarn fibers and fluff fibers of the double suede base fabric layer.

2. The regenerated cowhide fiber environmentally friendly leather according to claim 1, characterized in that: The fabric structure of the double-pile base fabric layer is a binding warp-binding double-layer structure, in which the surface warp and the surface weft are interwoven into the base fabric surface layer, and the inner warp and the inner weft are interwoven into the base fabric lining layer, and the binding warp is interwoven with the surface weft and the inner weft at the same time, so that the base fabric surface layer and the base fabric lining layer are connected to each other.

3. The regenerated cowhide fiber environmentally friendly leather according to claim 2, characterized in that: In the binding warp binding double-layer structure, the surface structure is a two-up and two-down right twill structure, the lining structure is a one-up and three-down right twill structure, the warp yarns are arranged in the order of one surface warp, one lining warp and one binding warp, and the weft yarns are arranged in the order of one surface weft and one lining weft.

4. The regenerated cowhide fiber environmentally friendly leather according to claim 3, characterized in that: The surface warp and the inner warp are island yarns, which are formed by compounding island yarns and high shrinkage yarns through network processing, and are formed by composite spinning of sea components covering island components, the sea component is low-viscosity PET, the island component is PBT / IPA copolymer, the high shrinkage yarn is modified PET, the connecting warp is high-strength PA66 filament, and the surface weft and the inner weft are modified PA6 staple yarns.

5. The regenerated cowhide fiber environmentally friendly leather according to claim 4, characterized in that: The raw materials of the island-in-the-sea yarn include the following components in parts by weight: 65-70 parts of low-viscosity PET, 35-40 parts of PBT / IPA copolymer, 30-35 parts of modified PET, and 0.6-0.8 parts of network oil.

6. The regenerated cowhide fiber environmentally friendly leather according to claim 1, characterized in that: The slurry of the cowhide fiber surface layer and the cowhide fiber bottom layer comprises the following components in parts by weight: 90-100 parts of regenerated cowhide fiber, 5-8 parts of plant fiber, 8-10 parts of temperature-sensitive hydrogel fiber, 3-5 parts of nano cellulose whiskers, and 5-8 parts of waterborne polyurethane.

7. The production line of regenerated cowhide fiber environmentally friendly leather according to any one of claims 1 to 6, characterized in that: It includes an inclined wire papermaking machine, a base fabric unwinding machine, a base fabric belt conveyor, a composite belt conveyor, a spunlace device and a drying device. The inclined wire papermaking machine is provided with two units. The base fabric unwinding machine is located at the front end of the base fabric belt conveyor, the spunlace device and the drying device are arranged in sequence at the rear end of the composite belt conveyor, and a carding machine is provided at the end of the base fabric belt conveyor. The carding machine is provided with upper combing tooth rollers and lower combing tooth rollers that are relatively arranged, followed by upper air knives and lower suction rollers that are relatively arranged, and finally upper ion wind rods and lower ion wind rods that are relatively arranged.

8. The production process of regenerated cowhide fiber environmentally friendly leather according to any one of claims 1 to 6, characterized in that: The steps include: Step a, preparing a double suede base fabric; Step b, the pulp is made into kraft fiber material by an inclined wire papermaking machine; Step c, unwinding the prefabricated double suede base fabric through a base fabric unwinding machine; Step d, the double suede base fabric is conveyed by a base fabric belt conveyor and sandwiched between the kraft fiber materials produced by two inclined wire papermaking machines, and finally stacked on a composite belt conveyor to form a sandwich structure fabric; Step e, the fabric enters the spunlace device, and the cowhide fiber surface layer, the double suede base fabric layer and the cowhide fiber bottom layer are spunlace composited by the spunlace machine; Step f, the composite substrate after spunlacing is sequentially subjected to rolling drying, drum drying, removal of harmful substances and rotary screen drying, and finally rolled up.

9. The production process of regenerated cowhide fiber environmentally friendly leather according to claim 8, characterized in that: The preparation process of the double suede base fabric is as follows: Step a, preparing sea-island yarn; Step b, weaving a base fabric with a double-layer structure; Step c, alkali treatment: 10% NaOH solution is used for alkali treatment at 90°C for 30 minutes; Step d, double-sided sanding: double-sided sanding is performed using a ceramic sanding disc at a rotation speed of 1500 rpm and a pressure of 0.15 MPa.

10. The production process of regenerated cowhide fiber environmentally friendly leather according to claim 9, characterized in that: The preparation process of the island-in-the-sea yarn is as follows: after the sea component slices and the island component slices are melted, the island-in-the-sea yarn with a 16-island structure is formed through an island-in-the-sea spinneret; the island-in-the-sea yarn and the high shrinkage yarn are networked in proportion to synthesize the island-in-the-sea yarn, and the yarn is treated with a polyether network oil agent.

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