Preparation method of warp-knitted fabric containing high-low temperature TPU composite low-elasticity monofilaments

Abstract

The invention relates to the technical field of textile, provides a preparation method of a warp knitted fabric containing high-low temperature TPU composite low-elasticity monofilaments, and solves the problems that single-melting-point TPU is easy to fuse or insufficient in melting and cannot achieve a melting bonding effect when the phenomena of disengagement and yarn slippage of a woven fabric are prevented, and the warp knitted fabric is not easy to deform. The skin-core structure polyester thermofuse is used for solving the problem that white dots are attached to the fabric when the skin layer is melted; comprising the following steps: 1) selecting raw material yarns; (2) weaving into grey cloth by using a tatting leno heald one-twisting six machine table; (3) performing pre-shaping treatment, and performing the processes of open-width washing, tentering shaping, color matching, inspection, packaging, warehousing and the like to obtain the warp knitted fabric containing the high-low-temperature TPU composite low-elasticity monofilaments; the high-low temperature TPU composite low-elasticity monofilament is of a skin-core structure, the skin-core structure comprises an inner core layer and an outer skin layer, and the melting point of the core layer is higher than that of the skin layer.

Description

Technical Field

[0001] The invention relates to the field of textile technology, and in particular to a method for preparing a warp knitted fabric containing high-low temperature TPU composite low-elastic monofilament. Background Art

[0002] Woven fabrics are made by interlacing warp and weft. They are compact, durable, and not easy to wear and deform. They are suitable for both clothing and shoes. However, due to the interlaced structure of warp and weft, unlike the warp knitting coils that are intertwined, they are easy to fall apart during cutting. Especially for fabrics that require later thread cutting, the weft yarn is easy to pull out. For woven leno fabrics, the warp yarns are twisted together by two systems of warp yarns and one system of weft yarns. Because of its twisted structure, the warp and weft become sparse, which is easy to slip and fall apart. Therefore, yarns with hot melt bonding properties are often used to increase the bonding force between the warp and weft points to prevent the fabric from falling apart and the yarns from slipping.

[0003] At present, the commonly used raw materials on the market to prevent woven fabrics from unraveling and yarn slippage are single-melting-point TPU and core-skin structure polyester hot melt yarn. TPU is used for warp yarn, but because of its unique melting point, if the temperature is too high during shaping, part of the TPU will melt, affecting the strength and quality of the fabric; if the temperature is too low, the TPU will not melt fully and the melt bonding effect cannot be achieved. Core-skin structure polyester hot melt yarn is used for weft yarn, and its core-skin melting point is inconsistent. Although it solves the TPU melting problem, there are problems such as white spots attached to the fabric due to the melting of the skin layer, and noise when the fabric is pulled.

[0004] Chinese patent application No. 202210416469.8 discloses a lightweight breathable upper fabric and a lightweight high-elastic fiber spinning process. The fabric is woven by an open-hole twisted heald weaving method. The ground warp is composed of 1 PEBA monofilament and 5 TPU monofilaments, the twisted warp is 1 TPU monofilament, and the weft yarn is composed of polyester multifilament; or the ground warp is composed of 4 PEBA monofilaments and 2 TPU monofilaments, the twisted warp is 1 TPU monofilament, and the weft yarn is composed of polyester multifilament; or the ground warp is composed of 5 PEBA monofilaments and 1 TPU monofilament, the twisted warp is 1 TPU monofilament, and the weft yarn is composed of polyester multifilament. The advantages of this fabric are: under the same weaving method, the weight of the fabric can be effectively reduced by 20%, while maintaining the tension and tear strength in the warp and weft directions. The bursting strength is much higher than that of traditional fabrics, the low-temperature tortuosity resistance is better, there is no crack after 40,000 low-temperature bendings, the use environment range is wider, the transparency is higher, and it has a good visual appearance texture. However, in this application, TPU monofilament is used for warp yarn, but due to its unique melting point, if the temperature is too high during shaping, part of the TPU will melt, affecting the strength and quality of the fabric; if the temperature is too low, the TPU will not melt fully, and the melt bonding effect cannot be achieved, and the woven fabric cannot be prevented from unraveling and the yarn slipping.

[0005] Chinese patent application No. 202323254268.1 discloses a partially elastic woven fabric, which is interwoven with warp yarns and weft yarns, and the woven fabric includes an elastic region and an inelastic region; the weft yarns include a first weft yarn and a second weft yarn; the first weft yarn is an elastic yarn, and the second weft yarn is a hot-melt yarn; the elastic region is interwoven with the first weft yarn and the warp yarn, and the inelastic region is interwoven with the first weft yarn, the second weft yarn and the warp yarn. The utility model relates to a partially elastic woven fabric, in which the hot-melt yarn and the elastic yarn woven through the common shed in the inelastic region are subjected to heat treatment, and the hot-melt yarn is melted and adhered to the elastic yarn, so that the elastic yarn cannot be elastically stretched, so that the woven fabric in this region is inelastic. In the elastic region, hot-melt yarn is not used, so that the region has good elasticity. However, when hot-melt yarn is used for weft yarn, there is a problem that the skin melts and white spots are attached to the fabric. Summary of the invention

[0006] Therefore, in view of the above problems, the present invention provides a method for preparing a warp knitted fabric containing a high-low temperature TPU composite low-elastic monofilament, so as to solve the problem that when preventing the woven fabric from unraveling and the yarn slipping, the single melting point TPU is easy to melt or the melting is insufficient and the melting bonding effect cannot be achieved, and the skin-core structured polyester hot melt yarn used for the weft yarn has the skin layer melting and white spots will be attached to the fabric.

[0007] To achieve the above object, the present invention adopts the following technical solutions:

[0008] A method for preparing a warp knitted fabric containing high-low temperature TPU composite low-elastic monofilament, comprising the following steps:

[0009] S1. Selection of raw material yarn: 0.20mm high and low temperature TPU composite low elastic monofilament, 0.12mm UTPEE bright yarn, polyester reflective 250D / 72F*2 double covered yarn, nylon high elastic DTY140D / 48F*2 mesh-free yarn, polyester high elastic DTY300D / 96F yarn;

[0010] Among them, the polyester reflective 250D / 72F*2 double-covered yarn, nylon high-elastic DTY140D / 48F*2 mesh-free yarn and polyester high-elastic DTY300D / 96F yarn are all spun from masterbatch; the polyester reflective 250D / 72F*2 double-covered yarn is black; the nylon high-elastic DTY140D / 48F*2 mesh-free yarn is white, and the polyester high-elastic DTY300D / 96F yarn is light red;

[0011] S2, using a shuttle-woven twisted heald and six-twist machine to weave a grey cloth, the grey cloth is interwoven with warp yarns and weft yarns, the warp yarns include upper warp twisted warps and lower warp ground warps, the weft yarns include first weft yarns, second weft yarns, third weft yarns and fourth weft yarns; the lower warp ground warps are six 0.12mm UTPEE glossy yarns, the upper warp twisted warps are one 0.20mm high-low temperature TPU composite low-elastic monofilament; the first weft yarn and the second weft yarn are both made of nylon high-elastic DTY140D / 48F*2 mesh-free yarn, the third weft yarn is made of polyester reflective 250D / 72F*2 double-wrapped yarn, and the fourth weft yarn is made of polyester high-elastic DTY300D / 96F yarn;

[0012] S3, pre-forming the grey cloth, and then washing it in open width, setting it by stretching, color approval, inspection, packaging and storage, etc., to obtain a warp knitted fabric containing high and low temperature TPU composite low elastic monofilament;

[0013] The high-low temperature TPU composite low-elastic monofilament is a skin-core structure, which includes an inner core layer and an outer skin layer, and the melting point of the core layer is higher than that of the skin layer.

[0014] Furthermore, the melting point of the core layer is 190°C, and the melting point of the skin layer is 170°C.

[0015] Furthermore, the number of twisted warps of the upper warp yarns is 1296, and the number of ground warps of the lower warp yarns is 7776.

[0016] Furthermore, the shuttle numbers of the first weft yarn and the second weft yarn are both 564, the shuttle number of the third weft yarn is 98, and the shuttle number of the fourth weft yarn is 99.

[0017] Furthermore, the specification of the 0.20 mm high and low temperature TPU composite low elastic monofilament is 350D and the color is transparent.

[0018] Furthermore, the 0.12 mm UTPEE glossy yarn has a specification of 140D and a transparent color, and is produced by copolymerization of TPU and TPEE.

[0019] Furthermore, glass beads are arranged on the surface of the polyester reflective 250D / 72F*2 double-wrapped yarn.

[0020] Furthermore, the polyester reflective 250D / 72F*2 double covered yarn is twisted by two polyester low-elastic yarns and one reflective yarn.

[0021] Furthermore, the weight of the warp knitted fabric is 282 g / m 2 The warp density is 57 strands / cm and the finished product density is 18 shuttles / cm.

[0022] Furthermore, the presetting temperature is set at 150-180°C, the fabric speed is set at 15 yards / min, the tentering setting temperature is set at 140-160°C, and the fabric speed is set at 125 yards / min.

[0023] By adopting the above technical solution, the beneficial effects of the present invention are:

[0024] 1. The high-low temperature TPU composite low-elastic monofilament used as raw material has a skin-core structure, with 190℃ high melting point TPU as the core layer and 170℃ low melting point TPU as the skin layer. When the setting temperature is higher than 170℃, the core layer does not melt, and the skin layer melts and solidifies, bonding the woven warp and weft tissue points to prevent it from falling apart and slipping.

[0025] 2. The equipment uses a shuttle weaving fine twist one twist six machine. The upper warp twist and the lower warp ground warp of the warp yarn are respectively a transparent high-low temperature TPU composite low-elastic monofilament and six UTPEE bright yarns. The two are twisted with each other to make the surface of the fabric have clear and evenly distributed yarn holes; the equipment has 8 steel reeds per centimeter, with high warp density to avoid slippage and delamination, and the fabric surface is delicate and soft to the touch; the third weft yarn in the weft direction is polyester reflective 250D / 72F*2 double-wrapped yarn. The weft of polyester reflective yarn will produce a striking effect when exposed to light due to the reflective function of the glass beads on the polyester reflective yarn, thereby increasing safety at night.

[0026] 3. The shaping process adopts hot air dry heat shaping method, with high temperature and fast pre-shaping and slightly lower temperature and slow shaping for finished product stretching, so that the fabric surface is stable during the shaping of the finished product, and the internal structure of the raw material will not be damaged, thus extending the service life of the fabric.

[0027] 4. The fabric is woven from colored yarn and does not require post-dyeing treatment. It only needs to be washed in open width. At the same time, the fabric is degreased and modified with auxiliaries, which saves energy, labor and time costs, reduces pollution emissions, and is environmentally friendly. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a structural schematic diagram of the skin-core structure in Examples 1 to 3 of the present invention;

[0029] Figure 2 Schematic diagram of the one-hedged six-hedged weaving of the grey cloth in Examples 1 to 3 of the present invention;

[0030] Explanation of the numbers in the figure: 1-core layer, 2-skin layer, 3-warp yarn, 4-weft yarn, 31-upper warp yarn twisted warp, 32-lower warp yarn ground warp. DETAILED DESCRIPTION

[0031] Example 1

[0032] A method for preparing a warp knitted fabric containing high-low temperature TPU composite low-elastic monofilament, comprising the following steps:

[0033] (1) Selection of raw yarn

[0034] The specifications used are 0.20mm high and low temperature TPU composite low elastic monofilament, 0.12mm UTPEE bright yarn, polyester reflective 250D / 72F*2 double covered yarn, nylon high elastic DTY140D / 48F*2 mesh-free yarn, polyester high elastic DTY300D / 96F yarn;

[0035] Among them, the polyester reflective 250D / 72F*2 double-covered yarn, nylon high-elastic DTY140D / 48F*2 mesh-free yarn and polyester high-elastic DTY300D / 96F yarn are all spun from masterbatch; the polyester reflective 250D / 72F*2 double-covered yarn is black; the nylon high-elastic DTY140D / 48F*2 mesh-free yarn is white, and the polyester high-elastic DTY300D / 96F yarn is light red;

[0036] The high-low temperature TPU composite low-elastic monofilament is a skin-core structure, which includes an inner core layer 1 and an outer skin layer 2, the melting point of the core layer 1 is higher than the melting point of the skin layer 2; the melting point of the core layer 1 is 190°C, and the melting point of the skin layer 2 is 170°C;

[0037] (2) Weaving

[0038] The grey cloth is woven by a shuttle-woven heddle-six-twist machine, wherein the grey cloth is interwoven by warp yarn 3 and weft yarn 4, wherein the warp yarn includes an upper warp yarn twisted warp 31 and a lower warp yarn ground warp 32, and the weft yarn includes a first weft yarn, a second weft yarn, a third weft yarn and a fourth weft yarn; the lower warp yarn ground warp 32 is six 0.12 mm UTPEE glossy yarns, and the upper warp yarn twisted warp 31 is a 0.20 mm high-low temperature TPU composite low-elastic monofilament; the first weft yarn and the second weft yarn are both made of nylon high-elastic DTY140D / 48F*2 mesh-free yarn, the third weft yarn is made of polyester reflective 250D / 72F*2 double-wrapped yarn, and the fourth weft yarn is made of polyester high-elastic DTY300D / 96F yarn;

[0039] Among them, the number of twisted warps of the upper warp yarn is 1296, and the number of ground warps of the lower warp yarn is 7776; the number of shuttles of the first weft yarn and the second weft yarn is 564, the number of shuttles of the third weft yarn is 98, and the number of shuttles of the fourth weft yarn is 99; the specification of the 0.20mm high and low temperature TPU composite low elastic monofilament is 350D, and the color is transparent; the specification of the 0.12mm UTPEE bright yarn is 140D, the color is transparent, and it is made of TPU and TPEE copolymer spinning; the surface of the polyester reflective 250D / 72F*2 double-wrapped yarn is provided with glass beads; the polyester reflective 250D / 72F*2 double-wrapped yarn is twisted by two polyester low elastic yarns and one reflective yarn;

[0040] (3) Pre-order type

[0041] The grey cloth is subjected to a pre-setting treatment, and the pre-setting machine adopts the EAG-2000-CBR-0 Taiwan Ligen setting machine. This setting machine adopts high-temperature hot air setting technology, so that the hot air acts evenly on the front and back sides of the fabric. When the temperature in the closed oven of the setting machine is higher than the glass transition temperature of the fabric, the polymer inside the fiber raw material is reorganized, thereby changing the surface size of the fabric. The grey cloth is fed into the setting machine along the weaving direction, and firstly, the setting size of the fabric is stretched or shrunk by the overfeed roller device and the needle clip chain stretching device, and then it is set through multiple dry heat closed oven devices. The set fabric is cooled and the pre-setting is completed. The pre-setting temperature is set at 150°C, and the input fabric speed is set at 15 yards / min, so that the TPU cortex can be fully melted without affecting the setting effect of the cloth surface;

[0042] (4) Open-width washing

[0043] Dye auxiliaries are used for open-width water washing. The formula of dye auxiliaries includes: 3% refining agent, 4% degreasing agent 119, 2% degreasing agent Z83, 4% chelating dispersant, and the balance is water. The open-width water washing speed is 12 yards / min. At 60°C, the refining agent is first added to box one and stirred to mix evenly; then the temperature is raised to 80°C, and degreasing agent Z83 and chelating dispersant are added to remove impurities; then after hot boiling in boxes three and four, the cloth is transferred to box five, and the temperature is lowered to 60°C for washing; the temperature in box six is ​​lowered to room temperature, and water is squeezed and dried, and finally the cloth is discharged; the refining agent and degreasing agent 119 are used to remove impurities, stains and oil stains on the surface of the fabric, and the chelating dispersant is used to prevent the generation of metal ion precipitation from affecting the color of the fabric, thereby improving the water washing effect;

[0044] (5) Tentering and shaping

[0045] The principle of tentering setting is basically the same as that of pre-setting, and the most important difference lies in the setting temperature and setting time. The setting machine uses EAG-2300-CBR-0 Taiwan Ligen setting machine, the tentering setting temperature is set at 140℃ to prevent TPU from melting again, and the input speed of the fabric is set at 12 yards / min;

[0046] (6) Then, the color approval, inspection, packaging and storage processes are carried out to obtain a warp knitted fabric containing high-low temperature TPU composite low-elastic monofilament, the gram weight of the warp knitted fabric is 282g / m 2 The warp density is 57 strands / cm and the finished product density is 18 shuttles / cm.

[0047] Example 2

[0048] (1) Selection of raw yarn

[0049] The specifications used are 0.20mm high and low temperature TPU composite low elastic monofilament, 0.12mm UTPEE bright yarn, polyester reflective 250D / 72F*2 double covered yarn, nylon high elastic DTY140D / 48F*2 mesh-free yarn, polyester high elastic DTY300D / 96F yarn;

[0050] Among them, the polyester reflective 250D / 72F*2 double-covered yarn, nylon high-elastic DTY140D / 48F*2 mesh-free yarn and polyester high-elastic DTY300D / 96F yarn are all spun from masterbatch; the polyester reflective 250D / 72F*2 double-covered yarn is black; the nylon high-elastic DTY140D / 48F*2 mesh-free yarn is white, and the polyester high-elastic DTY300D / 96F yarn is light red;

[0051] The high-low temperature TPU composite low-elastic monofilament is a skin-core structure, which includes an inner core layer 1 and an outer skin layer 2, the melting point of the core layer 1 is higher than the melting point of the skin layer 2; the melting point of the core layer 1 is 190°C, and the melting point of the skin layer 2 is 170°C;

[0052] (2) Weaving

[0053] The grey cloth is woven by a shuttle-woven heddle-six-twist machine, wherein the grey cloth is interwoven by warp yarn 3 and weft yarn 4, wherein the warp yarn includes an upper warp yarn twisted warp 31 and a lower warp yarn ground warp 32, and the weft yarn includes a first weft yarn, a second weft yarn, a third weft yarn and a fourth weft yarn; the lower warp yarn ground warp 32 is six 0.12 mm UTPEE glossy yarns, and the upper warp yarn twisted warp 31 is a 0.20 mm high-low temperature TPU composite low-elastic monofilament; the first weft yarn and the second weft yarn are both made of nylon high-elastic DTY140D / 48F*2 mesh-free yarn, the third weft yarn is made of polyester reflective 250D / 72F*2 double-wrapped yarn, and the fourth weft yarn is made of polyester high-elastic DTY300D / 96F yarn;

[0054] Among them, the number of twisted warps of the upper warp yarn is 1296, and the number of ground warps of the lower warp yarn is 7776; the number of shuttles of the first weft yarn and the second weft yarn is 564, the number of shuttles of the third weft yarn is 98, and the number of shuttles of the fourth weft yarn is 99; the specification of the 0.20mm high and low temperature TPU composite low elastic monofilament is 350D, and the color is transparent; the specification of the 0.12mm UTPEE bright yarn is 140D, the color is transparent, and it is made of TPU and TPEE copolymer spinning; the surface of the polyester reflective 250D / 72F*2 double-wrapped yarn is provided with glass beads; the polyester reflective 250D / 72F*2 double-wrapped yarn is twisted by two polyester low elastic yarns and one reflective yarn;

[0055] (3) Pre-order type

[0056] The grey cloth is subjected to a pre-setting treatment, and the pre-setting machine adopts the EAG-2000-CBR-0 Taiwan Ligen setting machine. This setting machine adopts high-temperature hot air setting technology, so that the hot air acts evenly on the front and back sides of the fabric. When the temperature in the closed oven of the setting machine is higher than the glass transition temperature of the fabric, the polymer inside the fiber raw material is reorganized, thereby changing the surface size of the fabric. The grey cloth is fed into the setting machine along the weaving direction, and firstly, the setting size of the fabric is stretched or shrunk by the overfeed roller device and the needle clip chain stretching device, and then it is set through multiple dry heat closed oven devices. The set fabric is cooled and the pre-setting is completed. The pre-setting temperature is set at 170°C, and the input fabric speed is set at 15 yards / min, so that the TPU cortex can be fully melted without affecting the setting effect of the cloth surface;

[0057] (4) Open-width washing

[0058] Dye auxiliaries are used for open-width water washing. The formula of dye auxiliaries includes: 3% refining agent, 5% degreasing agent 119, 3% degreasing agent Z83, 5% chelating dispersant, and the balance is water. The open-width water washing speed is 13 yards / min. At 60°C, the refining agent is first added to box one and stirred to mix evenly; then the temperature is raised to 80°C, and degreasing agent Z83 and chelating dispersant are added to remove impurities; then after hot boiling in boxes three and four, the cloth is transferred to box five, and the temperature is lowered to 60°C for washing; the temperature in box six is ​​lowered to room temperature, and water is squeezed and dried, and finally the cloth is discharged; the refining agent and degreasing agent 119 are used to remove impurities, stains and oil stains on the surface of the fabric, and the chelating dispersant is used to prevent the generation of metal ion precipitation from affecting the color of the fabric, thereby improving the water washing effect;

[0059] (5) Tentering and shaping

[0060] The principle of tentering setting is basically the same as that of pre-setting, and the most important difference lies in the setting temperature and setting time. The setting machine uses EAG-2300-CBR-0 Taiwan Ligen setting machine, the tentering setting temperature is set at 150℃ to prevent TPU from melting again, and the input speed of the fabric is set at 12 yards / min;

[0061] (8) Then, the color approval, inspection, packaging and storage processes are carried out to obtain a warp knitted fabric containing high-low temperature TPU composite low-elastic monofilament, wherein the weight of the warp knitted fabric is 282 g / m 2 The warp density is 57 strands / cm and the finished product density is 18 shuttles / cm.

[0062] Example 3

[0063] (1) Selection of raw yarn

[0064] The specifications used are 0.20mm high and low temperature TPU composite low elastic monofilament, 0.12mm UTPEE bright yarn, polyester reflective 250D / 72F*2 double covered yarn, nylon high elastic DTY140D / 48F*2 mesh-free yarn, polyester high elastic DTY300D / 96F yarn;

[0065] Among them, the polyester reflective 250D / 72F*2 double-covered yarn, nylon high-elastic DTY140D / 48F*2 mesh-free yarn and polyester high-elastic DTY300D / 96F yarn are all spun from masterbatch; the polyester reflective 250D / 72F*2 double-covered yarn is black; the nylon high-elastic DTY140D / 48F*2 mesh-free yarn is white, and the polyester high-elastic DTY300D / 96F yarn is light red;

[0066] The high-low temperature TPU composite low-elastic monofilament is a skin-core structure, which includes an inner core layer 1 and an outer skin layer 2, the melting point of the core layer 1 is higher than the melting point of the skin layer 2; the melting point of the core layer 1 is 190°C, and the melting point of the skin layer 2 is 170°C;

[0067] (2) Weaving

[0068] The grey cloth is woven by a shuttle-woven heddle-six-twist machine, wherein the grey cloth is interwoven by warp yarn 3 and weft yarn 4, wherein the warp yarn includes an upper warp yarn twisted warp 31 and a lower warp yarn ground warp 32, and the weft yarn includes a first weft yarn, a second weft yarn, a third weft yarn and a fourth weft yarn; the lower warp yarn ground warp 32 is six 0.12 mm UTPEE glossy yarns, and the upper warp yarn twisted warp 31 is a 0.20 mm high-low temperature TPU composite low-elastic monofilament; the first weft yarn and the second weft yarn are both made of nylon high-elastic DTY140D / 48F*2 mesh-free yarn, the third weft yarn is made of polyester reflective 250D / 72F*2 double-wrapped yarn, and the fourth weft yarn is made of polyester high-elastic DTY300D / 96F yarn;

[0069] Among them, the number of twisted warps of the upper warp yarn is 1296, and the number of ground warps of the lower warp yarn is 7776; the number of shuttles of the first weft yarn and the second weft yarn is 564, the number of shuttles of the third weft yarn is 98, and the number of shuttles of the fourth weft yarn is 99; the specification of the 0.20mm high and low temperature TPU composite low elastic monofilament is 350D, and the color is transparent; the specification of the 0.12mm UTPEE bright yarn is 140D, the color is transparent, and it is made of TPU and TPEE copolymer spinning; the surface of the polyester reflective 250D / 72F*2 double-wrapped yarn is provided with glass beads; the polyester reflective 250D / 72F*2 double-wrapped yarn is twisted by two polyester low elastic yarns and one reflective yarn;

[0070] (3) Pre-order type

[0071] The grey cloth is pre-shaped, and the pre-shaped machine adopts EAG-2000-CBR-0 Taiwan Ligen shaping machine. This shaping machine adopts high-temperature hot air shaping technology, so that the hot air acts evenly on the front and back sides of the fabric. When the temperature in the closed oven of the shaping machine is higher than the glass transition temperature of the fabric, the polymer inside the fiber raw material is reorganized, thereby changing the surface size of the fabric. The grey cloth is fed into the shaping machine along the weaving direction, and firstly, the shaping size of the fabric is stretched or shrunk by the overfeed roller device and the needle clip chain stretching device, and then it is shaped by multiple dry heat closed oven devices. After the shaped fabric is cooled, the pre-shaped is completed. The pre-shaping temperature is set at 180°C, and the input fabric speed is set at 15 yards / min, so that the TPU cortex can be fully melted without affecting the shaping effect of the cloth surface;

[0072] (4) Open-width washing

[0073] Dye auxiliaries are used for open-width water washing. The formula of dye auxiliaries includes: 5% refining agent, 6% degreasing agent 119, 3% degreasing agent Z83, 6% chelating dispersant, and the balance is water. The open-width water washing speed is 15 yards / min. At 60°C, the refining agent is first added to box one and stirred to mix evenly; then the temperature is raised to 80°C, and degreasing agent Z83 and chelating dispersant are added to remove impurities; then after hot boiling in boxes three and four, the cloth is transferred to box five, and the temperature is lowered to 60°C for washing; the temperature in box six is ​​lowered to room temperature, and water is squeezed and dried, and finally the cloth is discharged; the refining agent and degreasing agent 119 are used to remove impurities, stains and oil stains on the surface of the fabric, and the chelating dispersant is used to prevent the generation of metal ion precipitation from affecting the color of the fabric, thereby improving the water washing effect;

[0074] (5) Tentering and shaping

[0075] The principle of tentering setting is basically the same as that of pre-setting, and the most important difference lies in the setting temperature and setting time. The setting machine uses EAG-2300-CBR-0 Taiwan Ligen setting machine, the tentering setting temperature is set at 160℃ to prevent TPU from melting again, and the input speed of the fabric is set at 12 yards / min;

[0076] (6) Then, the color approval, inspection, packaging and storage processes are carried out to obtain a warp knitted fabric containing high and low temperature TPU composite low elastic monofilament, the gram weight of the warp knitted fabric is 282g / m 2 The warp density is 57 strands / cm and the finished product density is 18 shuttles / cm.

[0077] Table 1 is the test results of the product of Example 1.

[0078] Table 1

[0079]

[0080]

[0081] It can be seen from Table 1 that the color fastness of the fabric prepared by the technical solution, such as resistance to dry and wet friction, sweat and soap washing, all reach above level 4-5, indicating that the fabric has good color fastness; the bursting strength of the fabric reaches 2.10×10 3 kPa, high tear strength, indicating that the fabric strength is very good. The fabric wear resistance reaches level 4, and the folding resistance at room temperature and low temperature is intact without damage, indicating that the fabric has very good wear and folding resistance. All the test indicators of the fabric meet the requirements, so the fabric quality meets the predetermined design requirements of the project.

[0082] Although the present invention has been specifically shown and described in conjunction with the preferred embodiments, it should be understood by those skilled in the art that various changes may be made to the present invention in form and details without departing from the spirit and scope of the present invention as defined by the appended claims, all of which are within the scope of protection of the present invention.

Claims

1. A method for preparing a warp knitted fabric containing high and low temperature TPU composite low elastic monofilament, characterized in that: The following steps are involved: S1. Selection of raw material yarn: 0.20mm high and low temperature TPU composite low elastic monofilament, 0.12mm UTPEE bright yarn, polyester reflective 250D / 72F*2 double covered yarn, nylon high elastic DTY140D / 48F*2 mesh-free yarn, polyester high elastic DTY300D / 96F yarn; Among them, the polyester reflective 250D / 72F*2 double-covered yarn, nylon high-elastic DTY140D / 48F*2 mesh-free yarn and polyester high-elastic DTY300D / 96F yarn are all spun from masterbatch; the polyester reflective 250D / 72F*2 double-covered yarn is black; the nylon high-elastic DTY140D / 48F*2 mesh-free yarn is white, and the polyester high-elastic DTY300D / 96F yarn is light red; S2, using a shuttle-woven twisted heald and six-twist machine to weave a grey cloth, the grey cloth is interwoven by warp yarns and weft yarns, the warp yarns include upper warp twisted warps and lower warp ground warps, the weft yarns include first weft yarns, second weft yarns, third weft yarns and fourth weft yarns; the lower warp ground warps are six 0.12mm UTPEE glossy yarns, the upper warp twisted warps are one 0.20mm high-low temperature TPU composite low-elastic monofilament; the first weft yarn and the second weft yarn are both made of nylon high-elastic DTY140D / 48F*2 mesh-free yarn, the third weft yarn is made of polyester reflective 250D / 72F*2 double-wrapped yarn, and the fourth weft yarn is made of polyester high-elastic DTY300D / 96F yarn; S3, pre-forming the grey cloth, and then washing it in open width, setting it by stretching, color approval, inspection, packaging and storage, etc., to obtain a warp knitted fabric containing high and low temperature TPU composite low elastic monofilament; The high-low temperature TPU composite low-elastic monofilament is a skin-core structure, which includes an inner core layer and an outer skin layer, and the melting point of the core layer is higher than that of the skin layer.

2. The method for preparing a warp knitted fabric containing high-low temperature TPU composite low-elastic monofilament according to claim 1, characterized in that: The melting point of the core layer is 190°C, and the melting point of the skin layer is 170°C.

3. The method for preparing a warp knitted fabric containing high and low temperature TPU composite low elastic monofilament according to claim 1, characterized in that: The number of twisted warps of the upper warp yarn is 1296, and the number of ground warps of the lower warp yarn is 7776.

4. The method for preparing a warp knitted fabric containing high and low temperature TPU composite low elastic monofilament according to claim 1, characterized in that: The shuttle numbers of the first weft yarn and the second weft yarn are both 564, the shuttle number of the third weft yarn is 98, and the shuttle number of the fourth weft yarn is 99.

5. The method for preparing a warp knitted fabric containing high and low temperature TPU composite low elastic monofilament according to claim 1, characterized in that: The 0.20 mm high and low temperature TPU composite low elastic monofilament has a specification of 350D and is transparent in color.

6. The method for preparing a warp knitted fabric containing high and low temperature TPU composite low elastic monofilament according to claim 1, characterized in that: The 0.12 mm UTPEE glossy yarn has a specification of 140D and is transparent in color. It is made by copolymerization of TPU and TPEE.

7. The method for preparing a warp knitted fabric containing high and low temperature TPU composite low elastic monofilament according to claim 1, characterized in that: Glass micro beads are arranged on the surface of the polyester reflective 250D / 72F*2 double-wrapped yarn.

8. The method for preparing a warp knitted fabric containing high and low temperature TPU composite low elastic monofilament according to claim 1, characterized in that: The polyester reflective 250D / 72F*2 double covered yarn is twisted by two polyester low-elastic yarns and one reflective yarn.

9. The method for preparing a warp knitted fabric containing high and low temperature TPU composite low elastic monofilament according to claim 1, characterized in that: The weight of the warp knitted fabric is 282g / m 2 The warp density is 57 strands / cm and the finished product density is 18 shuttles / cm.

10. The method for preparing a warp knitted fabric containing high and low temperature TPU composite low elastic monofilament according to claim 1, characterized in that: The presetting temperature is set at 150-180°C, the fabric speed is set at 15 yards / min, the tentering setting temperature is set at 140-160°C, and the fabric speed is set at 125 yards / min.

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