High and low temperature TPU monofilament yarn and processing technology and knitted shoe upper thereof

Abstract

The application belongs to the technical field of textiles, and particularly relates to a high-low temperature TPU monofilament yarn, a processing technology thereof and a knitted vamp, comprising a TPU yarn with a skin-core structure, wherein the TPU yarn comprises a core layer and a skin layer, the core layer is modified for the purpose of improving the melting point, and the melting point of the skin layer is lower than that of the core layer; the core layer is modified by using a TPU raw material, so that the melting point of the core layer is improved, and the problem of poor thermal stability and easy decomposition under high temperature is solved; and the melting point of the core layer is higher than that of the skin layer, so that the processing cost of the whole monofilament yarn is reduced under the condition of modifying and improving the melting point.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of textiles, and particularly relates to a high-low temperature TPU monofilament yarn, a processing technology thereof, and a knitted shoe upper. BACKGROUND

[0002] In view of the increasing market demand and the continuous improvement of the quality of life, the public has increasingly strict requirements for the texture, comfort, and fashionable beauty of textile fabrics. The current textile fabric materials on the market are relatively single, and have gradually failed to meet the diversified needs of consumers. The single-layer net cloth knitted by the traditional single needle bed high-speed warp knitting machine is mostly of the ordinary type, and lacks innovation and breakthrough. As a kind of thermoplastic elastomer, TPU material not only provides significant physical property improvement and technological sense for basic shoe fabric, but also has great application potential.

[0003] TPU material has attracted much attention due to its excellent oil and solvent resistance, excellent weather resistance, and outstanding high-energy radiation resistance. At the same time, it has excellent wear resistance, tear resistance, and flexural strength, high tensile strength, large elongation, and low long-term compression permanent deformation rate. These significant advantages make it have high application value in the field of textile fabrics. However, the thermal stability of TPU material is relatively poor, and it is easy to decompose in a high-temperature environment, which limits its more extensive application.

[0004] The core goal of the present application is to solve the above problems, and to realize green, efficient, and comfortable production of textile fabrics through technological innovation, in order to meet the diversified needs of the market. SUMMARY

[0005] The present application discloses a high-low temperature TPU monofilament yarn, a processing technology thereof, and a knitted shoe upper, which mainly solves the problem of poor thermal stability and easy decomposition at high temperatures in the process of applying TPU material to fabric processing.

[0006] To achieve the purpose, the present application provides a high-low temperature TPU monofilament yarn, which comprises a TPU yarn with a skin-core structure, the TPU yarn comprising a core layer processed for the purpose of improving the melting point and a skin layer with a lower melting point than the core layer.

[0007] Preferably, the softening temperature of the skin layer is 80-100℃.

[0008] Preferably, the melting point of the core layer is 100-200℃.

[0009] Preferably, the weight percentage of the skin layer in the TPU yarn is 20-80%.

[0010] Preferably, the processing modification comprises any one of introducing intramolecular groups, adding organic silicon, and filler compounding.

[0011] The application also provides a woven vamp, comprising a vamp body, wherein the vamp body comprises TPU yarn with a sheath-core structure, and the TPU yarn comprises a core layer and a sheath layer, wherein the core layer is modified for improving the melting point, and the melting point of the sheath layer is lower than that of the core layer.

[0012] Preferably, the softening temperature of the sheath layer is 80-100 DEG C, and the melting point of the core layer is 100-200 DEG C.

[0013] The application also provides a processing technology of high-low temperature TPU monofilament yarn, comprising the following steps:

[0014] The modification step: the TPU raw material is divided into two groups, and the first group is added with organic silicon for physical blending modification, so as to improve the melting point of the TPU material in the first group, and the second group remains unchanged.

[0015] The drying and plasticizing step: the two groups of TPU materials are put into a drying machine for dehumidifying drying treatment at different temperatures, and then are plasticized by a screw.

[0016] The extrusion and cooling step: the first group of TPU materials is used as the core material for forming the core layer, and the second group is used as the sheath material for forming the sheath layer, the core layer is placed in the outer circle, the sheath layer is placed in the inner circle, and then is extruded, measured and cooled into a yarn.

[0017] The stretching step: after the yarn is formed, the first heat stretching is performed, then the second heat stretching is performed by using hot water with a higher temperature, and then the heat setting treatment is performed.

[0018] The setting and oiling step: the cold setting treatment is performed, then the oiling treatment is performed, and then the winding is performed, and finally the TPU yarn with the sheath-core structure is processed, wherein the melting point of the core layer of the TPU yarn is higher than that of the sheath layer.

[0019] Preferably, the content of the organic silicon is 8-12%.

[0020] The application also provides a processing technology of high-low temperature TPU monofilament yarn, comprising the following steps:

[0021] The modification step: the TPU raw material is divided into two groups, and the first group is added with CaSO4 filler for processing modification, so as to improve the melting point of the TPU material in the first group, and the second group remains unchanged.

[0022] The drying and plasticizing step: the two groups of TPU materials are put into a drying machine for dehumidifying drying treatment at different temperatures, and then are plasticized by a screw.

[0023] The extrusion and cooling step: the first group of TPU materials is used as the core material for forming the core layer, and the second group is used as the sheath material for forming the sheath layer, the core layer is placed in the outer circle, the sheath layer is placed in the inner circle, and then is extruded, measured and cooled into a yarn.

[0024] Stretching step: after spinning, the first heat stretching is carried out, then the second stretching is carried out using hot water with higher temperature, and then heat setting treatment is carried out;

[0025] Shaping and oiling step: cold setting treatment is carried out, then oiling treatment is carried out, and winding is carried out, and finally TPU yarn with a skin-core structure is processed, and the melting point of the core layer of the TPU yarn is higher than that of the skin layer.

[0026] The technical scheme provided by the application has at least the following technical effects:

[0027] The high-low temperature TPU monofilament yarn disclosed in the application comprises a TPU yarn with a skin-core structure, the TPU yarn comprises a core layer and a skin layer with a lower melting point than the core layer. The core layer is modified by modifying the TPU raw material, thereby improving the melting point of the core layer, solving the problem of poor thermal stability and easy decomposition at high temperature; and the melting point of the core layer is higher than that of the skin layer, and in the case of modifying and improving the melting point, the processing cost of the entire monofilament yarn is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0028] In order to more clearly illustrate the technical solutions in the embodiments of the application, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings in the following description are only some embodiments of the application, and other drawings can be obtained by those skilled in the art without creative labor.

[0029] Figure 1 It is a structure schematic view of the TPU monofilament yarn of the embodiment 1 of the application.

[0030] Figure 2 It is a processing process flow schematic view of the high-low temperature TPU monofilament yarn of the embodiment 3 of the application.

[0031] Figure 3 It is a processing process flow schematic view of the high-low temperature TPU monofilament yarn of the embodiment 4 of the application.

[0032] Main drawing mark explanation: 1, core layer; 2, skin layer. DETAILED DESCRIPTION

[0033] The embodiments of the application will be described in detail below, and examples of the embodiments are shown in the drawings, wherein the same or similar reference numerals represent the same or similar elements or elements with the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary and are intended to explain the embodiments of the application, and cannot be understood as a limitation of the application.

[0034] In the description of the embodiments of the application, it should be understood that the terms "length", "width", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings based on the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the embodiments of the application and simplifying the description, and therefore cannot be understood as indicating or implying that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the application.

[0035] In addition, the terms "first", "second" are only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features. In the description of the embodiments of the application, the meaning of "multiple" is two or more, unless otherwise explicitly specified.

[0036] Embodiment 1

[0037] With reference to Figure 1 , the embodiment discloses a high and low temperature TPU monofilament yarn, comprising a TPU yarn with a skin-core structure, the TPU yarn comprising a core layer 1 processed for the purpose of improving the melting point and a skin layer 2 with a melting point lower than that of the core layer 1. Specifically, the TPU raw material of the TPU yarn can be modified by introducing intramolecular groups, adding organic silicon or filler composite, etc., to change the melting point of the TPU and solve the shortcomings of poor thermal stability and easy decomposition at high temperature. In this embodiment, the high and low temperature TPU monofilament yarn, the skin layer 2 is low temperature TPU, the softening temperature range is 80℃-180℃; the core layer 1 is high temperature TPU, the melting point range is 100℃-220℃; wherein the weight percentage of the skin layer 2 in the TPU yarn is 20%-80%; different modification methods are used to raise the melting point of the TPU to different temperature ranges. And the skin-core structure makes the TPU shoe upper fabric have different design possibilities, and the melting point of the core layer 1 is higher than that of the skin layer 2. In the case of modifying and improving the melting point, the processing cost of the whole monofilament yarn is reduced. The whole high and low temperature TPU monofilament yarn not only continues the advantages of TPU, such as green environmental protection, biodegradable recycling and use; but also has high strength and good elasticity, good wear resistance, oil resistance, cold resistance and mold resistance; high mechanical strength, high impact resistance, good hydrolysis resistance and oil resistance, and good low temperature resistance.

[0038] It has good wear resistance, tensile property, tear strength, oil resistance, cold resistance and impact resistance, and stable performance in low temperature environment.

[0039] Embodiment 2

[0040] The embodiment discloses a woven vamp, comprising a vamp body, the vamp body comprising a TPU yarn with a sheath-core structure, the TPU yarn comprising a core layer 1 and a sheath layer 2, the core layer 1 being modified for the purpose of improving the melting point, and the melting point of the sheath layer 2 being lower than that of the core layer 1. The softening temperature of the sheath layer 2 is 80-100 DEG C, and the melting point of the core layer 1 is 100-200 DEG C. The TPU raw material of the TPU yarn is modified by introducing intramolecular groups, adding silicone or filler composites and the like, the melting point of the TPU is changed, the defects of poor thermal stability and easy decomposition at high temperature are solved, and then the thermal stability, wear resistance, hydrolysis resistance and the like of the whole vamp are improved.

[0041] Embodiment 3

[0042] Reference Figure 2 The embodiment discloses a processing technology of high-low temperature TPU monofilament yarn, comprising the following steps:

[0043] Polyester TPU-LN59-1 (melting point 190 DEG C) is used as a raw material, and is divided into two groups A and B. 10% of silicone is added to the group A, the melting point of the TPU material in the group A is successfully improved to 210 DEG C by physical blending modification, and the material in the group B remains unchanged. Then, the group A is subjected to dehumidification and drying treatment at 90 DEG C, and the group B is subjected to dehumidification and drying treatment at 60 DEG C, and the treatment time is 4-5 hours. Then, the dried raw material is plasticized by using screw plasticization technology, the group A is plasticized at 210 DEG C and 10.00 rounds per minute, and the group B is plasticized at 190 DEG C and 8.50 rounds per minute. The plasticized material is sent out through a spinneret assembly, and is extruded and measured according to the layout of the core layer 1 on the outer ring and the sheath layer 2 on the inner ring. Then, the yarn is formed by ice water cooling, and is separated by hand. Due to the low glass transition temperature, the yarn is stretched for the first time by using hot water at 100 DEG C, and is stretched for the second time by using high-temperature hot water at 170 DEG C, so that the strength of the yarn is improved. However, due to the large shrinkage of the yarn caused by the two stretching processes, heat setting treatment is performed to reduce the thermal shrinkage temperature of the yarn, and the yarn stretching process is completed. In view of the fact that the viscosity of the TPU yarn is significantly solidified after stretching, the yarn is again shaped by using ice water, and is subjected to oiling treatment and winding. After the finished yarn is placed in a balancing workshop for 2 days, the finished yarn is finally processed into a TPU yarn with a sheath-core structure. This process not only improves the melting point of the TPU, but also solves the problems of poor thermal stability and easy decomposition at high temperature. The final product, the high-low temperature TPU monofilament yarn, not only retains the advantages of TPU, such as green environmental protection, degradable and recyclable use, but also exhibits high strength, good elasticity, wear resistance, oil resistance, cold resistance and mildew resistance. In addition, the high-low temperature TPU monofilament yarn has high mechanical strength, high impact resistance, good hydrolysis resistance and oil resistance, and stable performance in a low-temperature environment, and has excellent wear resistance, tensile properties, tear strength, oil resistance, cold resistance and impact resistance.

[0044] Embodiment 4

[0045] Reference Figure 3 The embodiment discloses a processing technology of high-low temperature TPU monofilament yarn, comprising the following steps:

[0046] The polyester type TPU-LN09-1 (melting point 160 degrees Celsius) is processed in groups and divided into group A and group B. The material in group A is modified by adding 2% CaSO4 filler, aiming to solve the problems of insufficient thermal stability and easy decomposition under high temperature conditions. After this treatment, the melting point of the TPU material in group A is successfully increased to 200 DEG C. The material in group B remains unchanged.

[0047] In the subsequent manufacturing process, group A is used as the core material and group B is used as the skin material. The two groups of materials are respectively subjected to dehumidification and drying treatment in a drying machine. Group A is treated at 90 DEG C for 4-5 hours, and group B is treated at 60 DEG C for the same length of time. Then, the dried raw materials are respectively plasticized by a screw plasticizing machine. Group A is plasticized at 200 DEG C and 10.00 revolutions per minute, and group B is plasticized at 160 DEG C and 8.50 revolutions per minute.

[0048] The plasticized raw materials are extruded and metered by a spinneret assembly, with group A as the outer core layer 1 and group B as the inner skin layer 2. The extruded filaments are separated by hand after being cooled by ice water. Since the glass transition temperature of the material is low, we use 100 DEG C hot water for the first drawing, and then use 170 DEG C high-temperature hot water for the second drawing. This step significantly improves the strength of the yarn, but also increases its shrinkage. Therefore, we perform heat setting treatment to reduce the heat shrinkage temperature of the yarn.

[0049] Finally, since the TPU yarn has a high viscosity solidification after stretching, we use ice water for re-setting, and perform oiling treatment and winding. The finished product after winding is placed in the balancing workshop for 2 days to ensure its stability and quality. The final product is a TPU yarn with a skin-core structure. This process not only increases the melting point of TPU, but also solves the problems of poor thermal stability and easy decomposition under high temperature. The final product, high-low temperature TPU monofilament yarn, not only retains the advantages of TPU, such as green environmental protection, biodegradable and recyclable use, but also exhibits high strength, good elasticity, wear resistance, oil resistance, cold resistance and mildew resistance. In addition, it has high mechanical strength, high impact resistance, good hydrolysis resistance and oil resistance, and stable performance in low temperature environment, with excellent wear resistance, tensile properties, tear strength, oil resistance, cold resistance and impact resistance.

[0050] The above is only a preferred embodiment of the present application and is not intended to limit the present application. Any modification, equivalent replacement and improvement made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A high and low temperature TPU monofilament yarn characterized by, The TPU yarn with a skin-core structure includes a core layer (1) and a skin layer (2) with a lower melting point than the core layer (1), and a processing technology of the high-low temperature TPU monofilament yarn, comprising the following steps: The modification step: the TPU raw material is divided into two groups, and the organic silicon is added for physical blending modification in the first group to improve the melting point of the TPU material in the first group, and the second group remains unchanged; The drying and plasticizing step: the two groups of TPU materials are placed in a drying machine for dehumidifying drying treatment at different temperatures, and then plasticized by a screw; The extrusion cooling step: the first group of TPU materials is the core material for forming the core layer (1), and the second group is the skin material for forming the skin layer (2), and the core layer (1) is placed in the inner circle, and the skin layer (2) is placed in the outer circle for extrusion metering and cooling into a yarn; The stretching step: after the yarn is formed, the first heat stretching is performed, then the second stretching is performed using hot water with a higher temperature, and then the heat setting treatment is performed; The setting and oiling step: the cold setting treatment is performed, then the oiling treatment is performed, and then the winding is performed, and finally the TPU yarn with a skin-core structure is processed, and the melting point of the core layer (1) of the TPU yarn is higher than that of the skin layer (2).

2. The high and low temperature TPU monofilament yarn of claim 1, wherein, The softening temperature of the skin layer (2) is 80-100℃.

3. The high-low temperature TPU monofilament yarn of claim 1, wherein, The melting point of the core layer (1) is 100-200℃.

4. The high-low temperature TPU monofilament yarn of claim 1, wherein, The weight percentage of the skin layer (2) in the TPU yarn is 20-80%.

5. The high and low temperature TPU monofilament yarn according to any one of claims 1-4, characterized in that, The processing modification includes any one of introducing intramolecular groups, adding organic silicon, and adding fillers.

6. The high-low temperature TPU monofilament yarn of claim 1, wherein, The content of the organic silicon is 8-12%.

7. The high-low temperature TPU monofilament yarn according to claim 5, characterized in that: In the modification step, the filler added is CaSO4.

8. A woven upper, woven from the high and low temperature TPU monofilament yarn of claim 1, comprising an upper body, characterized in that, The upper body includes a TPU yarn with a skin-core structure, and the TPU yarn includes a core layer (1) and a skin layer (2) with a lower melting point than the core layer (1).

9. A woven upper according to claim 8, wherein, The softening temperature of the skin layer (2) is 80-100℃, and the melting point of the core layer (1) is 100-200℃.

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