A temperature-sensitive shape memory paper yarn and its manufacturing process

Abstract

This invention relates to a temperature-sensitive shape memory paper yarn and its manufacturing process, belonging to the field of textile technology. The manufacturing process of this temperature-sensitive shape memory paper yarn includes the following steps: dissolving shape memory polyurethane in a solvent to obtain a uniform coating liquid; uniformly coating the coating liquid onto one side surface of the paper yarn base paper, drying and curing to obtain a composite paper yarn base paper; controlling the temperature below the switching temperature of the shape memory polyurethane to maintain the flatness of the composite paper yarn base paper, cutting the composite paper yarn base paper into uniform, tear-free, and smooth-edged thin strips; controlling the temperature above the switching temperature of the shape memory polyurethane, twisting the thin strips into temperature-sensitive shape memory paper yarn using a spinning machine; wherein the mass percentage of shape memory polyurethane in the temperature-sensitive shape memory paper yarn is 20%-40%. This invention enhances the breaking strength and elasticity of the paper yarn without affecting its wearing comfort, while also improving the wrinkle resistance of the paper yarn fabric.

Description

Technical Field

[0001] This invention relates to a temperature-sensitive shape memory paper yarn and its production process, belonging to the field of textile technology. Background Technology

[0002] With technological advancements and improved living standards, people have increasingly higher demands for the performance of clothing fabrics. Paper yarn, a type of yarn primarily made from lignin fiber, is processed similarly to papermaking. The process is simple and does not release harmful substances, making it suitable for producing knitted textile products that come into direct contact with the skin, such as T-shirts and socks. These products offer advantages such as moisture absorption and breathability, antibacterial and odor control, static electricity prevention, and natural environmental friendliness. While paper yarn fabrics offer better breathability and quick-drying properties than cotton, pure paper yarn suffers from low tensile strength and poor elasticity. During weaving, the yarn is prone to breakage, leading to high production difficulty and technical barriers. Furthermore, the resulting paper yarn fabric also exhibits poor elasticity and tensile strength, making it prone to wrinkling and affecting wearing comfort. This significantly limits the application of paper yarn in textiles.

[0003] To improve the performance of paper yarn, there are currently three methods: 1. Adding modifiers to the pulp to increase the strength of the paper yarn. This is a commonly used method, but the improvement in yarn performance is limited and the method is relatively complex and costly; 2. Blending with other high-performance chemical fibers to obtain composite yarns with better performance. However, after blending paper yarn with other chemical fibers, such as paper yarn / polyester wrapped composite yarn, the longitudinal direction has an obvious spiral twisted structure, that is, the yarn surface is rough, which will affect the comfort of the fabric when in contact with the skin; 3. Improving the strength of paper yarn by sizing. However, paper yarn is currently used to produce knitted fabrics. After sizing, the yarn becomes stiff, which is not conducive to bending the yarn into loops, and the fabric performance will not be improved after desizing.

[0004] Therefore, how to enhance the breaking strength and elasticity of paper yarn without affecting the wearing comfort, while improving the wrinkle resistance of paper yarn fabric, has become a problem that needs to be solved in this field. Summary of the Invention

[0005] [Technical Issues]

[0006] How to enhance the breaking strength and elasticity of paper yarn without affecting the wearing comfort, while also improving the wrinkle resistance of paper yarn fabric?

[0007] [Technical Concept]

[0008] To address the aforementioned issues, this invention provides a production process for temperature-sensitive shape memory paper yarn. The process involves composite shape memory polyurethane with paper yarn base paper using a coating method. A coating liquid containing shape memory polyurethane is evenly applied to one side of the paper yarn base paper in the required amount and then dried and cured to form a composite paper yarn base paper. Utilizing the characteristic that shape memory polyurethane has poor elastic recovery and maintains its shape below the switching temperature, while regaining elasticity above the switching temperature, the composite paper yarn base paper remains flat and does not curl below the switching temperature of the shape memory polyurethane, facilitating the cutting of the composite paper yarn base paper into uniform strips. During the twisting and spinning process of the paper strips, the ambient temperature is adjusted to be higher than the switching temperature of the shape memory polyurethane, causing the shape memory spandex on the paper strips to regain elasticity and shrink. The paper strips curl towards the shape memory polyurethane surface, encasing the shape memory polyurethane inside the yarn, resulting in the desired temperature-sensitive shape memory paper yarn. The surface layer of this temperature-sensitive shape memory paper yarn is the paper yarn base paper, which does not affect the wearing comfort of the paper yarn. The resulting temperature-sensitive shape memory paper yarn exhibits improved tensile strength, elasticity, and flexibility, while also possessing a certain degree of shape memory. Specifically, below the switching temperature, the yarn's elastic recovery is poor, and its deformation is somewhat fixed; above the switching temperature, the yarn's elasticity recovers, allowing it to return to its original shape within a short time. Since paper yarn is typically used in apparel fabrics, fabrics woven from composite shape memory paper yarn not only have increased strength but also shape memory properties. Furthermore, above the switching temperature, the fabric retains some elasticity, making it less prone to wrinkles and improving its wearability.

[0009] One of the key technical means of this invention is to cut the paper into uniform strips at a temperature below the switching temperature of the shape memory polyurethane; and to twist and spin the yarn at a temperature above the switching temperature of the shape memory polyurethane. This allows the shape memory polyurethane to be encapsulated within the yarn, and makes the surface layer of the temperature-sensitive shape memory paper yarn a paper yarn base. Conversely, cutting the paper into uniform strips at a temperature above the switching temperature of the shape memory polyurethane is not conducive to cutting; twisting and spinning at a temperature below the switching temperature of the shape memory polyurethane cannot form the special structure that encapsulates the shape memory polyurethane within the yarn and makes the surface layer of the temperature-sensitive shape memory paper yarn a paper yarn base, which will lead to a decrease in wearing comfort.

[0010] Unlike existing technologies that first produce paper yarn fabric and then coat it with a coating, resulting in a paper yarn fabric with a polyurethane surface layer, this invention coats the yarn during the yarn preparation process. Through specific processing, it can obtain a yarn structure with a polyurethane inner layer and a paper yarn surface layer. This can enhance the breaking strength and elasticity of the paper yarn without affecting its wearing comfort, while also improving the wrinkle resistance of the paper yarn fabric.

[0011] [Technical Solution]

[0012] On the one hand, a production process for temperature-sensitive shape memory paper yarn is provided, which includes the following steps:

[0013] (1) Coating liquid preparation: Dissolve shape memory polyurethane in solvent to obtain a uniform coating liquid;

[0014] (2) Coating finishing: The coating liquid obtained in step (1) is evenly coated on one side surface of the paper yarn base paper, dried and cured to obtain composite paper yarn base paper;

[0015] (3) Cut into strips: Control the temperature below the switching temperature of the shape memory polyurethane in step (1), keep the composite paper yarn base paper flat, and cut the composite paper yarn base paper obtained in step (2) into uniform, tear-free, and smooth and flat thin strips.

[0016] (4) Spinning: Control the temperature to be higher than the switching temperature of the shape memory polyurethane in step (1), and twist the slender paper strips obtained in step (3) into temperature-sensitive shape memory paper yarn through a spinning machine; wherein the mass percentage of shape memory polyurethane in the temperature-sensitive shape memory paper yarn is 20%-40%.

[0017] In some embodiments, the solvent in step (1) is N,N-dimethylacetamide.

[0018] In some embodiments, the mass percentage of the paper yarn base in the temperature-sensitive shape memory paper yarn is 60%-80%.

[0019] In some embodiments, the basis weight of the paper yarn in step (2) is 10-20 grams per square meter.

[0020] In some embodiments, the switching temperature range of the shape memory polyurethane in step (1) is 23-30°C.

[0021] In some embodiments, the basis weight of the composite paper yarn base paper in step (2) is 15-30 grams per square meter, wherein the basis weight of the coating is 5-10 grams per square meter.

[0022] In some embodiments, the mass concentration of the shape memory polyurethane coating liquid in the coating liquid obtained in step (1) is 10-25%.

[0023] In some embodiments, the thickness of the temperature-sensitive shape memory paper yarn is 20-50 tex.

[0024] In some embodiments, step (2) is performed using a doctor blade coater with a coating speed of 0.2-0.5 m / min, a drying and curing temperature of 70-100℃, and a drying and curing time of 10-20 min.

[0025] In some embodiments, step (3) involves cutting the paper using a paper cutter, with the width of the cut paper strips being 0.8-5.0 mm.

[0026] On the other hand, a temperature-sensitive shape memory paper yarn produced by the aforementioned production process is provided, wherein the surface layer of the temperature-sensitive shape memory paper yarn is the paper yarn base paper, and the shape memory polyurethane is located inside the temperature-sensitive shape memory paper yarn.

[0027] On the other hand, the aforementioned application of temperature-sensitive shape memory paper yarn in the preparation of wrinkle-resistant textiles is provided.

[0028] On the other hand, a wrinkle-resistant paper yarn fabric is provided, which includes the aforementioned temperature-sensitive shape memory paper yarn.

[0029] On the other hand, a production process for wrinkle-resistant paper yarn fabric is provided, which uses the aforementioned temperature-sensitive shape memory paper yarn as yarn and is woven using a loom with a single-sided weft plain weave structure.

[0030] [Beneficial Effects]

[0031] 1) One of the raw materials for the temperature-sensitive shape memory paper yarn of the present invention is shape memory polyurethane, which has a switching temperature of 23-30°C. During the preparation process, it utilizes the characteristic that the shape is fixed due to poor elastic recovery below the switching temperature and the elasticity is restored above the switching temperature, so that the prepared composite paper yarn base paper remains flat below the switching temperature, which is convenient for cutting into strips. During the twisting and spinning process of the paper strip, the ambient temperature is adjusted to be higher than the switching temperature, so that the shape memory spandex on the paper strip recovers its elasticity and shrinks. The paper strip curls towards the shape memory polyurethane surface, wrapping the shape memory polyurethane inside the yarn. The outside of the yarn is still paper yarn, which will not affect the comfort and feel of the paper yarn fabric.

[0032] 2) The temperature-sensitive shape memory paper yarn of this invention is a composite yarn with improved tensile breaking properties and elasticity compared to pure paper yarn. Its tensile breaking strength is 74% higher, and its tensile breaking elongation is 136% higher. Its evenness is improved by approximately 50% compared to paper yarn wrapped with polyester. Furthermore, the yarn possesses certain shape memory properties. When the temperature is below the switching temperature, the yarn elasticity is poor, and the deformation can be fixed to a certain extent. When the temperature is above the switching temperature, the shape memory effect of the shape memory polyurethane is triggered, the yarn elasticity improves, and it can recover its original shape. The weft-knitted plain weave fabric woven from it also has certain shape memory properties, improving the wrinkle resistance of the paper yarn fabric. This invention enhances the breaking strength and elasticity of the paper yarn without affecting its wearing comfort, while simultaneously improving the wrinkle resistance of the paper yarn fabric.

[0033] 3) The temperature-sensitive shape memory paper yarn obtained by this invention does not require chemical synthesis or modification of the papermaking raw materials. Instead, it uses a coating to composite and finish the paper yarn base paper, without affecting the cutting and spinning process. The production method is simple and the production efficiency is high. Attached Figure Description

[0034] Figure 1This is a schematic diagram of a composite paper yarn base paper obtained by coating shape memory polyurethane and paper yarn base paper. The upper layer is the shape memory polyurethane coating, and the lower layer is the paper yarn base paper.

[0035] Figure 2 This is a schematic diagram of the spinning process of shape memory composite paper yarn;

[0036] Figure 3 Image a shows the weft-knitted plain weave temperature-sensitive shape memory paper yarn fabric prepared in Example 3 before folding; image b shows the weft-knitted plain weave temperature-sensitive shape memory paper yarn fabric prepared in Example 3 after folding and placing it at 20°C for 1 hour; image c shows the weft-knitted plain weave temperature-sensitive shape memory paper yarn fabric prepared in Example 3 after folding and placing it at 35°C for 10 minutes. Detailed Implementation

[0037] Test method:

[0038] Shape memory performance test:

[0039] First, equilibrate the sample (yarn or fabric) at 34℃ for 10 minutes. Mark the sample 200 mm from the center. Then, stretch the sample by 5% (10 mm) and fix it. Place it in a 20℃ environment and equilibrate for 10 minutes. Release one end of the sample and measure the marked length L1. Calculate the sample shape fixation rate R. f = (L1-200) / 10*100%; Release the sample and place it at 34℃ for 10 min, measure the sample mark length L2, and calculate the shape recovery rate R. r = (L2-L1) / (L1-200)*100%, test 5 times, record the data, and calculate the average value.

[0040] Yarn breaking performance test:

[0041] The XL-2 yarn tensile strength and elongation tester was used. The yarn clamping distance was set to 500 mm, the stretching speed to 500 mm / min, the pre-tension to 0.5 cN / tex, the test temperature to 22℃, and the humidity to 65%. The test was performed 10 times to obtain the tensile breaking strength and elongation of the yarn, and the average value was calculated.

[0042] Yarn evenness test:

[0043] The YG133B / PRO-H yarn evenness tester was used. The test speed was set to 200 m / min and the test time was 5 min. Each sample was tested 5 times and the average value was taken.

[0044] Example 1: Temperature-sensitive shape memory paper yarn and its preparation process

[0045] A temperature-sensitive shape memory paper yarn comprises the following components by weight percentage: shape memory polyurethane content is 28.6%, and yarn base paper content is 71.4%.

[0046] The manufacturing process of this temperature-sensitive shape memory paper yarn includes raw material selection, coating solution preparation, coating finishing, paper strip cutting, and spinning. Specifically:

[0047] 1) Raw material selection: The raw materials are temperature-sensitive shape memory polyurethane with a switching temperature of 26℃ and paper yarn with a basis weight of 15g per square meter.

[0048] 2) Coating solution preparation: N,N-dimethylacetamide (DMAC) is used as solvent and thermosensitive shape memory polyurethane with a switching temperature of 26℃ is used as solute. The two are mixed and stirred for 24 hours to fully dissolve, sealed and left to stand for 24 hours to prepare a coating solution with a thermosensitive shape memory polyurethane mass concentration of 15%.

[0049] 3) Coating finishing: Using a doctor blade coating machine, the coating speed is set to 0.4m / min and the coating thickness is 0.1mm. The coating liquid obtained in step 2) is evenly coated on one side of the paper yarn base paper. It is dried and cured at 80℃ for 10min to obtain a composite paper yarn base paper with a basis weight of about 20g per square meter.

[0050] 4) Slitting paper strips: Keep the composite paper yarn base paper flat below the temperature of the shape memory polyurethane switch, and use a paper cutter to slit the composite paper yarn base paper into thin strips 1.3mm wide. The resulting paper strips are uniform, without tearing damage, and have smooth and flat edges.

[0051] 5) Spinning: Above the temperature of the shape memory polyurethane switch, the thin paper strips obtained in step 4) are twisted into paper yarn with a thickness of about 32 tex using a spinning machine.

[0052] Through the above process, the 32tex temperature-sensitive shape memory paper yarn of this embodiment can be obtained.

[0053] Example 2: Temperature-sensitive shape memory paper yarn and its preparation process

[0054] A temperature-sensitive shape memory paper yarn comprises the following components by weight percentage: shape memory polyurethane content is 28.6%, and yarn base paper content is 71.4%.

[0055] The manufacturing process of this temperature-sensitive shape memory paper yarn includes raw material selection, coating solution preparation, coating finishing, paper strip cutting, and spinning. Specifically:

[0056] 1) Raw material selection: The raw materials are temperature-sensitive shape memory polyurethane with a switching temperature of 26℃ and paper yarn with a basis weight of 15g per square meter.

[0057] 2) Coating solution preparation: N,N-dimethylacetamide (DMAC) is used as solvent and thermosensitive shape memory polyurethane with a switching temperature of 26℃ is used as solute. The two are mixed and stirred for 24 hours to fully dissolve, sealed and left to stand for 24 hours to prepare a coating solution with a thermosensitive shape memory polyurethane mass concentration of 15%.

[0058] 3) Coating finishing: Using a doctor blade coating machine, the coating speed is set to 0.4m / min and the coating thickness is 0.1mm. The coating liquid obtained in step 2) is evenly coated on the surface of the paper yarn base paper. It is dried and cured at 80℃ for 10min to obtain a composite paper yarn base paper with a basis weight of about 20g per square meter.

[0059] 4) Slitting paper strips: Keep the composite paper yarn base paper flat below the shape memory polyurethane switch temperature, and use a paper cutter to slit the composite paper yarn base paper into thin strips 1.6mm wide. The resulting paper strips are uniform, without tearing damage, and have smooth and flat edges.

[0060] 5) Spinning: Above the temperature of the shape memory polyurethane switch, the thin paper strips obtained in step 4) are twisted into paper yarn with a thickness of about 40 tex using a spinning machine.

[0061] Through the above process, the 40tex temperature-sensitive shape memory paper yarn of this embodiment can be obtained.

[0062] Example 3: A temperature-sensitive shape memory paper yarn fabric and its preparation process

[0063] A temperature-sensitive shape memory paper yarn fabric comprises the following components by weight percentage: 28.5% shape memory polyurethane and 71.5% yarn paper.

[0064] The manufacturing process of this temperature-sensitive shape memory paper yarn fabric includes yarn selection, loom selection, weaving process selection, and fabric weaving, specifically:

[0065] 1) Yarn selection: 40tex temperature-sensitive shape memory paper yarn prepared by the method in Example 2 was selected;

[0066] 2) Loom selection: The M153XS12S type fully-furnished computer flat knitting machine with machine number E12 is adopted;

[0067] 3) Fabrication process: Single-sided weft plain weave;

[0068] 4) Fabric weaving.

[0069] Through the above processes, the weft-knitted plain weave temperature-sensitive shape memory paper yarn fabric of this embodiment can be obtained.

[0070] Comparative Example 1:

[0071] The preparation process of temperature-sensitive shape memory paper yarn is the same as in Example 1, except that the paper yarn base paper is not coated or finished. This includes: raw material selection, paper strip cutting, and spinning; specifically:

[0072] 1) Raw material selection: Paper yarn base paper with a weight of 15g per square meter is used as raw material;

[0073] 2) Slitting paper strips: The paper yarn base paper is slid into thin strips 1.3mm wide using a paper cutter. The resulting paper strips are uniform, without tearing or damage, and have smooth and flat edges.

[0074] 3) Spinning: The thin paper strips obtained in step 2) are twisted into paper yarn with a thickness of about 19 tex using a spinning machine;

[0075] After the above process, 19tex pure paper yarn can be obtained.

[0076] Tests showed that, compared with Example 1, the paper yarn base paper in Comparative Example 1 was not coated, but was directly cut into strips and spun to produce pure paper yarn. The resulting yarn was thinner, with poorer tensile and breaking properties (lower strength and lower elongation), and did not have shape memory properties.

[0077] Comparative Example 2:

[0078] A temperature-sensitive shape memory paper yarn comprises the following components by weight percentage: shape memory polyurethane content is 9.1%, and yarn base paper content is 90.9%.

[0079] The preparation process of the temperature-sensitive shape memory paper yarn is the same as in Example 1, except that the mass concentration of temperature-sensitive shape memory polyurethane in the coating liquid is reduced to reduce the content of shape memory polyurethane in the temperature-sensitive shape memory paper yarn. Specifically, the mass concentration of temperature-sensitive shape memory polyurethane in the coating liquid is 5%.

[0080] The manufacturing process of this temperature-sensitive shape memory paper yarn includes raw material selection, coating solution preparation, coating finishing, paper strip cutting, and spinning. Specifically:

[0081] 1) Raw material selection: The raw materials are temperature-sensitive shape memory polyurethane with a switching temperature of 26℃ and paper yarn with a basis weight of 15g per square meter.

[0082] 2) Coating solution preparation: N,N-dimethylacetamide (DMAC) is used as solvent and thermosensitive shape memory polyurethane with a switching temperature of 26℃ is used as solute. The two are mixed and stirred for 24 hours to fully dissolve, sealed and left to stand for 24 hours to prepare a coating solution with a mass concentration of 5% thermosensitive shape memory polyurethane.

[0083] 3) Coating finishing: Using a doctor blade coating machine, the coating speed is set to 0.4m / min and the coating thickness is 0.1mm. The coating liquid obtained in step 2) is evenly coated on the surface of the paper yarn base paper. It is dried and cured at 80℃ for 10min to obtain a composite paper yarn base paper with a basis weight of about 17g per square meter.

[0084] 4) Slitting paper strips: Keep the composite paper yarn base paper flat below the temperature of the shape memory polyurethane switch, and use a paper cutter to slit the composite paper yarn base paper into thin strips 1.3mm wide. The resulting paper strips are uniform, without tearing damage, and have smooth and flat edges.

[0085] 5) Spinning: Above the temperature of the shape memory polyurethane switch, the thin paper strips obtained in step 4) are twisted into paper yarn with a thickness of about 21 tex using a spinning machine.

[0086] Through the above process, the 21tex temperature-sensitive shape memory paper yarn of this comparative example can be obtained.

[0087] Tests showed that, compared with Example 1, the content of temperature-sensitive shape memory polyurethane in Comparative Example 2 was too low, resulting in a low degree of improvement in yarn performance and an insignificant shape memory performance of the yarn.

[0088] Comparative Example 3:

[0089] The preparation process of the composite paper yarn is the same as in Example 1, except that shape memory polyurethane is replaced with ordinary polyurethane. The specific process includes: raw material selection, coating liquid preparation, and coating finishing; specifically:

[0090] 1) Raw material selection: Ordinary polyurethane paper with a weight of 15g per square meter is selected as the raw material;

[0091] 2) Coating solution preparation: N,N-dimethylacetamide (DMAC) is used as solvent and ordinary polyurethane is used as solute. The two are mixed and stirred for 24 hours to fully dissolve. The mixture is then sealed and left to stand for 24 hours to prepare a coating solution with a mass concentration of 15% thermosensitive shape memory polyurethane.

[0092] 3) Coating finishing: Using a doctor blade coating machine, the coating speed is set to 0.4m / min and the coating thickness is 0.1mm. The coating liquid obtained in step 2) is evenly coated on the surface of the paper yarn base paper. It is dried and cured at 80℃ for 10min to obtain a composite paper yarn base paper with a basis weight of about 17g per square meter.

[0093] Research has shown that, compared to Example 1, the composite paper yarn base paper tends to curl toward the coating surface due to the better elasticity of ordinary polyurethane, making it difficult to cut into strips.

[0094] Comparative Example 4:

[0095] Commercially available Nm22.5 (approximately 44.4 tex) 60% paper / 40% polyester wrapping yarn, with polyester as the core yarn.

[0096] The results of testing on the tensile breaking strength, elongation, and yarn uniformity of Examples 1 and 2, Comparative Examples 1, 2, and 4 are shown in Table 1.

[0097] Table 1

[0098]

[0099]

[0100] The shape memory performance test results of Examples 1 to 3 and Comparative Example 2 are shown in Table 2:

[0101] Table 2

[0102]

[0103] Analysis of Tables 1 and 2 shows that:

[0104] In Examples 1 and 2, the yarn thicknesses obtained from spinning are different due to the different widths of the slit paper strips, but the composition ratio of the yarns is the same. Therefore, the tensile breaking strength, elongation, unevenness, and shape memory properties of the yarns are similar.

[0105] The yarn in Comparative Example 1 is pure paper yarn, so it has poor tensile breaking strength and elongation, and no shape memory properties.

[0106] The yarn in Comparative Example 2 has a low content of shape memory polyurethane, and its tensile breaking strength and elongation are slightly better than those of the pure paper yarn in Comparative Example 1. However, compared with the example, its tensile breaking strength, elongation and shape memory performance are all worse.

[0107] Comparative Example 4 is a commercially available Nm22.5 60% paper / 40% polyester wrapped yarn, which has poor yarn unevenness and no shape memory properties.

[0108] Example 3 is a weft-knitted plain weave fabric woven from temperature-sensitive shape memory paper yarn, which also has shape memory properties and can improve the wrinkle resistance of paper yarn fabrics (see...). Figure 3 ).

[0109] The embodiments provided above are not intended to limit the scope of the invention, nor are the described steps intended to limit the order of execution. Any obvious modifications made to the invention by those skilled in the art based on existing common knowledge also fall within the scope of protection defined by the claims.

Claims

1. A process for the production of a temperature sensitive shape memory paper yarn, characterized in that, It comprises the following steps: (1) coating liquid preparation: dissolving shape memory polyurethane in solvent to obtain uniform coating liquid; (2) coating finishing: uniformly coating the coating liquid obtained in step (1) on one side surface of paper yarn base paper, drying and curing to obtain composite paper yarn base paper; (3) slitting into paper strips: controlling the temperature to be lower than the switching temperature of shape memory polyurethane in step (1), keeping the composite paper yarn base paper flat, and slitting the composite paper yarn base paper obtained in step (2) into uniform, tear-free, and smooth and flat edge long paper strips; (4) spinning: controlling the temperature to be higher than the switching temperature of shape memory polyurethane in step (1), and twisting the long paper strips obtained in step (3) into temperature-sensitive shape memory paper yarn by a spinning machine; wherein the mass percentage of shape memory polyurethane in the temperature-sensitive shape memory paper yarn is 20%-40%.

2. The production process according to claim 1, characterized in that, The mass percentage of paper yarn base paper in the temperature-sensitive shape memory paper yarn is 60%-80%.

3. The production process according to claim 1, characterized in that, The grammage of paper yarn base paper in step (2) is 10-20 g / m2; the grammage of composite paper yarn base paper in step (2) is 15-30 g / m2, wherein the coating grammage is 5-10 g / m2.

4. The production process according to claim 1, characterized in that, The switching temperature of shape memory polyurethane in step (1) ranges from 23 to 30℃.

5. The production process according to claim 1, characterized in that, The thickness of the temperature-sensitive shape memory paper yarn is 20-50 tex.

6. The production process according to claim 1, characterized in that, Step (3) adopts a paper cutter for slitting, and the width of the slitted paper strips is 0.8-5.0 mm.

7. The temperature-sensitive shape memory paper yarn produced by the production process according to any one of claims 1 to 6, characterized in that The surface layer of the temperature-sensitive shape memory paper yarn is paper yarn base paper, and the shape memory polyurethane is located in the interior of the temperature-sensitive shape memory paper yarn.

8. Use of the temperature-sensitive shape memory paper yarn of claim 7 in the preparation of anti-wrinkle textiles.

9. A crease-resistant paper tissue web characterized by, The temperature-sensitive shape memory paper yarn of claim 7.

10. A process for the production of a crease resistant paper veil fabric, characterized in that, The temperature-sensitive shape memory paper yarn of claim 7 is used as yarn, and a loom is used to weave a single-weft plain weave process to obtain.

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