Foaming down-proof process of cold expansion particles on knitted material

Abstract

The invention belongs to the technical field of textile material treatment, and particularly relates to a foaming down-proof process of cold expansion particles on a knitted material. Comprising the following steps: screening cold expansion particles, adding the cold expansion particles into a solution containing a dispersing agent, cleaning and drying a fiber material for knitting, putting yarns containing the cold expansion particles into vacuum spraying equipment, and spraying the yarns on the vacuum spraying equipment. The method comprises the following steps: spraying a yarn, standing the yarn in a specific temperature and humidity environment after spraying, carrying out heat treatment on the yarn after standing, carrying out secondary shaping treatment on the dried yarn, controlling the shaping temperature, the stretching ratio and the time, and carrying out quality detection on the processed yarn. According to the foaming down-proof technology of the cold expansion particles on the knitted material, the cold expansion particles are applied to the foaming down-proof technology of the knitted material, the characteristic that the cold expansion particles expand when encountering cold is utilized, fiber gaps are filled when the temperature is reduced, the down-proof performance is effectively improved, meanwhile, the heat preservation performance of a fabric is enhanced, and the fabric is comfortable to wear. And the improvement of multiple properties by a single material is realized.

Description

Technical Field

[0001] The present invention relates to the technical field of textile material treatment, and specifically to a foaming anti-down process of cold-expandable particles on knitted materials. Background Art

[0002] In the textile industry, with the continuous improvement of people's requirements for the functionality of clothing, fabrics with good warmth retention, anti-down, breathability, and waterproof performance have attracted much attention.

[0003] Traditional down fabrics have certain advantages in terms of warmth retention, but there are many deficiencies. Their windproof performance is average, and in cold and windy weather, cold air is likely to penetrate through the fabric gaps, resulting in heat loss of the human body; it is difficult to achieve an ideal balance between breathability and waterproofness. When ensuring a certain level of waterproofness, breathability is often poor, and the wearer is prone to feeling stuffy, while improving breathability will reduce the waterproof effect; the anti-down penetration performance also needs to be improved. After multiple washes and uses, the down is likely to drill out of the fabric, which not only affects the beauty and warmth retention performance of the clothing but may also cause allergic problems. In view of this, a foaming anti-down process of cold-expandable particles on knitted materials is proposed. Summary of the Invention

[0004] The main object of the present invention is to provide a foaming anti-down process of cold-expandable particles on knitted materials, which can solve the problems raised in the above background art.

[0005] To achieve the above object, the foaming anti-down process of cold-expandable particles on knitted materials proposed by the present invention includes the following steps:

[0006] S1. Select high-quality knitted fiber materials and screen the cold-expandable particles, and prepare a specific dispersant;

[0007] S2. Add the cold-expandable particles into the solution containing the dispersant, and form a dispersion liquid through high-speed stirring and ultrasonic treatment;

[0008] S3. Clean and dry the knitted fiber materials. At the same time, during the spinning process, evenly mix the cold-expandable particle dispersion liquid into the fiber materials, control the addition ratio, and make yarns;

[0009] S4. Place the yarns containing cold-expandable particles in a vacuum spraying device, and perform 360° spraying with a special PU foaming adhesive. Control the spraying pressure, temperature, and time, and let the yarns stand in a specific temperature and humidity environment after spraying;

[0010] S5. Perform heat treatment on the standing yarns, and precisely control the pressure at the same time. Then, wash and low-temperature dry the heat-treated yarns;

[0011] S6. Perform secondary setting treatment on the dried yarn, control the setting temperature, stretching ratio and time, and then conduct quality inspection on the treated yarn.

[0012] Preferably, the fiber material for knitting is nylon fiber. Deionized water and mild detergent are used during the cleaning treatment, and it is dried at a low temperature after cleaning, with the drying temperature being 30 - 40°C.

[0013] Preferably, the particle size of the cold expansion particles is 20 - 50 μm, the dispersant is sodium polyacrylate, the high - speed stirring speed is 1500 - 2000 r / min, the stirring time is 30 - 40 minutes, the ultrasonic treatment power is 300 - 400 W, and the treatment time is 20 - 30 minutes.

[0014] Preferably, during the spinning process, the addition ratio of the cold expansion particle dispersion liquid is 3% - 5% of the mass of the fiber material, the spinning speed is 500 - 800 m / min, the spinning tension is 2 - 3 cN / tex, and the spinning temperature is 20 - 25°C.

[0015] Preferably, the PU foaming adhesive is heated to 50 - 60°C before spraying, the stirring time is 20 - 30 minutes, the spraying pressure is 0.3 - 0.5 MPa, the spraying temperature is 50 - 60°C, and the spraying time is 15 - 20 minutes.

[0016] Preferably, the static temperature of the yarn in a specific temperature and humidity environment is 25 - 30°C, the static humidity is 50% - 60%, and the static time is 2 - 3 hours.

[0017] Preferably, the heat treatment temperature of the static yarn is 80 - 100°C, the holding time is 15 - 20 minutes, and the pressure is controlled at 0.1 - 0.2 MPa.

[0018] Preferably, when washing the heat - treated yarn, mild detergent and clear water are used, the detergent concentration is 0.3% - 0.5%, the washing temperature is 30 - 40°C, the washing time is 10 - 15 minutes, and the drying temperature is 40 - 50°C.

[0019] Preferably, the secondary setting temperature of the dried yarn is 120 - 150°C, the stretching ratio is 10% - 15%, and the setting time is 5 - 10 minutes.

[0020] Preferably, the quality inspection includes detecting the uniformity of the cold expansion particle distribution, the thickness and adhesion of the foaming adhesive layer, the strength and elasticity of the yarn. When the cold expansion particle distribution is uneven, adjust the preparation process or addition method of the dispersion liquid. When the thickness of the foaming adhesive layer does not meet the requirements, adjust the spraying pressure, temperature and time parameters.

[0021] The present invention provides a foaming and down-proofing process for cold-expandable particles on knitted materials, with the following beneficial effects:

[0022] (1) In the foaming and down-proofing process for cold-expandable particles on knitted materials, the cold-expandable particles are applied to the foaming and down-proofing process of knitted materials. Utilizing the property of cold-expandable particles expanding when cooled, they fill the fiber gaps when the temperature decreases, effectively improving the down-proof performance and enhancing the warmth retention performance of the fabric, achieving the improvement of multiple properties by a single material.

[0023] (2) Through the collaborative optimization of multiple process steps such as raw material pretreatment, mixing and spinning, foaming agent treatment, heat treatment, washing and drying, and secondary shaping, the foaming and down-proofing process for cold-expandable particles on knitted materials ensures a good combination of cold-expandable particles and fiber materials, as well as the stable adhesion of the foaming agent layer, thus achieving a balanced improvement in the down-proofing, warmth retention, breathability, and waterproof performance of knitted materials and overcoming the problem of mutual restriction of various properties in traditional processes.

[0024] (2) By precisely controlling the process parameters of each link, such as temperature, pressure, time, addition amount, etc., the foaming and down-proofing process for cold-expandable particles on knitted materials ensures the stability and repeatability of the process, and can mass-produce high-quality down-proof yarns to meet market demands. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on the structures shown in these drawings.

[0026] Figure 1 It is the overall flowchart of the foaming and down-proofing process for cold-expandable particles on knitted materials of the present invention;

[0027] Figure 2 It is the flowchart of the pretreatment of cold-expandable particles in the foaming and down-proofing process for cold-expandable particles on knitted materials of the present invention;

[0028] Figure 3 It is the flowchart of spraying and standing in the foaming and down-proofing process for cold-expandable particles on knitted materials of the present invention;

[0029] Figure 4 It is the flowchart of post-treatment and detection in the foaming and down-proofing process for cold-expandable particles on knitted materials of the present invention;

[0030] Figure 5 It is the detection of the cold-expandable particle knitted fabric of the present inventionFigure 1 ;

[0031] Figure 6 For the detection of the cold-expanded particle knitted fabric of the present invention Figure 2 。

[0032] The realization, functional features and advantages of the object of the present invention will be further described with reference to the embodiments and the accompanying drawings. Specific embodiments

[0033] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0034] Please refer to Figures 1 - 4 , the present invention proposes a foaming anti-down process of cold-expanded particles on knitted materials, including the following steps:

[0035] S1. Select high-quality knitted fiber materials and screen the cold-expanded particles, and prepare a specific dispersant;

[0036] Among them, the knitted fiber material is nylon fiber. Nylon fiber has good strength, wear resistance and chemical corrosion resistance, which can provide a basic guarantee for subsequent process treatment and fabric performance. Before use, the nylon fiber is strictly cleaned with deionized water and mild detergent to remove impurities, grease and other pollutants on the fiber surface. The fiber is soaked in deionized water containing an appropriate amount of detergent for 15-20 minutes, and then gently stirred and rinsed multiple times to ensure that the fiber surface is clean. After cleaning, the fiber is dried in a low-temperature environment, and the drying temperature is set at 30-40 °C to avoid damage to the fiber due to high temperature and maintain its original physical properties;

[0037] S2. Add the cold-expanded particles into the solution containing the dispersant, and form a dispersion liquid through high-speed stirring and ultrasonic treatment;

[0038] Among them, the particle size of the cold-expandable particles is 20 - 50 μm. This particle size range can not only ensure the uniform dispersion of the cold-expandable particles in the fiber material, but also effectively fill the fiber gaps when expanding upon cooling, playing the roles of preventing down leakage and providing warmth. The dispersant is sodium polyacrylate. Selecting sodium polyacrylate as the dispersant, it has good dispersion performance, which can make the cold-expandable particles uniformly disperse in the solution and avoid the occurrence of agglomeration. Dissolve sodium polyacrylate in deionized water according to a certain ratio to prepare a dispersant solution for standby. Slowly add the selected cold-expandable particles into the solution containing the dispersant to ensure full contact between the particles and the solution. Use a high-speed stirring device to stir at a speed of 1500 - 2000 r / min for 30 - 40 minutes. High-speed stirring can initially disperse the cold-expandable particles in the solution and break the agglomeration force between the particles. Subsequently, use an ultrasonic treatment device to perform ultrasonic treatment on the mixed solution. The ultrasonic treatment power is set at 300 - 400 W, and the treatment time is 20 - 30 minutes. Ultrasonic treatment can further refine the dispersion state of the particles, making the cold-expandable particles uniformly and stably disperse in the solution to form a uniformly dispersed dispersion liquid;

[0039] S3. Clean and dry the fiber material for knitting. At the same time, during the spinning process, uniformly mix the cold-expandable particle dispersion liquid into the fiber material, control the addition ratio, and make it into yarn;

[0040] Among them, during the spinning process, use an adding device to uniformly mix the prepared cold-expandable particle dispersion liquid into the polyamide fiber material. Precisely control the addition ratio of the cold-expandable particle dispersion liquid so that it accounts for 3% - 5% of the mass of the fiber material. This ratio has been verified through a large number of experiments, which can not only ensure the cold-expandable particles to play their functions, but also have no negative impact on the spinnability of the fiber and the physical properties of the yarn. During the spinning process, strictly control parameters such as the spinning speed, tension, and temperature. The spinning speed is controlled at 500 - 800 m / min to ensure the forming quality and production efficiency of the yarn; the spinning tension is maintained at 2 - 3 cN / tex to ensure the strength and uniformity of the yarn; the spinning temperature is controlled at 20 - 25 °C to provide a suitable environment for the stretching and twisting of the fiber and avoid changes in fiber properties due to too high or too low temperature. At the same time, during the spinning process, further comb and mix the fibers to make the cold-expandable particles fully interweave with the polyamide fibers to ensure the uniform distribution of the cold-expandable particles in the yarn;

[0041] S4. Place the yarn containing cold-expandable particles in a vacuum spraying device, and perform 360° spraying with a special PU foaming glue. Control the spraying pressure, temperature, and time, and let the yarn stand in a specific temperature and humidity environment after spraying;

[0042] Among them, the yarn containing cold expansion particles is placed in a vacuum spraying device, and a special PU foaming adhesive is used for 360° spraying. Before spraying, the PU foaming adhesive is heated to 50 - 60°C and stirred for 20 - 30 minutes to make the foaming adhesive have good fluidity and uniformity, facilitating the spraying operation. During the vacuum spraying process, the spraying pressure, temperature, and time are precisely controlled. The spraying pressure is controlled at 0.3 - 0.5 MPa to ensure that the foaming adhesive can evenly adhere to the surface of the yarn; the spraying temperature is maintained at 50 - 60°C to enable the foaming adhesive to spread and cure better during spraying; the spraying time is set to 15 - 20 minutes to ensure that a foaming adhesive layer with a moderate and uniform thickness is formed on the surface of the yarn. After spraying, the yarn is left to stand in a specific temperature and humidity environment. The standing temperature is controlled at 25 - 30°C, the humidity is maintained at 50% - 60%, and the standing time is 2 - 3 hours. During the standing process, the foaming adhesive gradually cures and tightly combines with the yarn to form a stable protective layer;

[0043] S5. Heat-treat the yarn after standing, precisely control the pressure at the same time, and then wash and low-temperature dry the heat-treated yarn;

[0044] Among them, for the heat treatment of the yarn after standing, the yarn is placed in a heat treatment device, heated to 80 - 100°C, and maintained for 15 - 20 minutes. During the heat treatment process, through a precise pressure control device, the pressure is stabilized at 0.1 - 0.2 MPa. Heat treatment can activate the cold expansion particles, causing changes in their internal structure, preparing for subsequent expansion in different temperature environments, and at the same time ensuring that the distribution of cold expansion particles in the yarn is not affected and preventing premature expansion. After heat treatment, the yarn is subjected to washing and low-temperature drying treatments. When washing, use clear water containing 0.3% - 0.5% mild detergent to wash the yarn at a water temperature of 30 - 40°C for 10 - 15 minutes. The mild detergent can effectively remove the excess foaming adhesive and impurities on the surface of the yarn without damaging the yarn and the foaming adhesive layer. After washing, the yarn is dried in a low-temperature environment of 40 - 50°C to avoid deformation of the foaming adhesive layer or changes in the performance of the cold expansion particles due to high temperature;

[0045] S6. Perform a secondary shaping treatment on the dried yarn, control the shaping temperature, stretching ratio, and time, and then conduct quality inspection on the treated yarn;

[0046] Among them, the dried yarn is subjected to secondary setting treatment. The yarn is placed in a setting device, and the setting temperature is controlled at 120 - 150 °C, the stretching ratio is 10% - 15%, and the setting time is 5 - 10 minutes. The secondary setting can further stabilize the structure of the yarn, improve the strength, elasticity and dimensional stability of the yarn, making it more suitable for subsequent knitting processing. After completing the secondary setting, a comprehensive quality inspection is carried out on the treated yarn. The inspection items include the uniformity of the distribution of cold-expandable particles, the thickness and adhesion of the foaming glue layer, the strength and elasticity of the yarn, etc. The distribution of cold-expandable particles in the yarn is observed through an electron microscope to ensure its uniform dispersion; a thickness gauge is used to detect the thickness of the foaming glue layer to ensure that it meets the process requirements; the strength and elasticity of the yarn are tested through a tensile testing machine to ensure that the yarn has good physical properties. According to the quality inspection results, the process parameters are adjusted and optimized. If the distribution of cold-expandable particles is uneven, the preparation process of the dispersion liquid can be adjusted, such as increasing the stirring time or adjusting the ultrasonic treatment power; if the thickness of the foaming glue layer does not meet the requirements, the spraying pressure, temperature and time parameters can be adjusted to ensure the stable and reliable quality of each batch of yarn.

[0047] Furthermore, the cold-expandable particles maintain a stable form in a normal environment. When in a low-temperature environment, their internal structure will change and the particle volume will rapidly expand. In this process, by precisely controlling the parameters of each link, it is ensured that the cold-expandable particles are reasonably distributed in the yarn and can effectively fill the tiny gaps between the fibers when encountering low temperature, thereby preventing the down from drilling out and achieving efficient down-proof. At the same time, the expansion of the cold-expandable particles can also form more air chambers between the fibers, further enhancing the thermal insulation performance of the knitted material.

[0048] Furthermore, the special PU foaming glue has good flexibility and adhesiveness. During the vacuum spraying process, the foaming glue can evenly wrap the surface of the yarn and penetrate into the gaps between the cold-expandable particles and the fibers. After standing and curing, the foaming glue forms a dense and elastic protective layer, which not only enhances the overall strength of the yarn, but also effectively prevents the cold-expandable particles from falling off during use, and to a certain extent improves the waterproof performance of the knitted material.

[0049] Please refer to Figures 5 - 6, in the embodiments of the present invention, the yarns that have passed the quality inspection are woven into fabrics using knitting techniques. According to different product requirements, appropriate knitting methods are selected, such as weft knitting or warp knitting, as well as different fabric structures, such as plain stitch, rib, etc. During the weaving process, the parameters of the knitting machine are strictly controlled, such as stitch density, knitting needle movement speed, etc., to ensure the knitting quality and dimensional accuracy of the fabric. After weaving, the fabric is subjected to finishing treatment. First, pre-shrinking treatment is carried out, using steam pre-shrinking or mechanical pre-shrinking methods to control the shrinkage rate of the fabric at a relatively low level, generally requiring the shrinkage rate not to exceed 3%. Then, softening treatment is carried out, using an environmentally friendly softener, through padding or impregnation methods, to make the softener evenly adhere to the surface of the fabric, improving the hand feeling and wearing comfort of the fabric. Finally, water-repellent finishing is carried out, using fluorine-containing or fluorine-free water-repellent auxiliaries, through processes such as padding and baking, to endow the fabric with good water-repellent performance. After the water-repellent finishing, the surface moisture resistance of the fabric should reach level 4-5.

[0050] Furthermore, through multiple treatment processes for the yarns and fabrics, the fabrics of the present invention have been significantly improved in terms of anti-down, warmth retention, breathability, and waterproof performance. In terms of anti-down performance, the cold-expandable particles expand at low temperatures, filling the fiber gaps. Combining with the tightly woven structure and the blocking effect of the foaming glue layer, the down leakage value of the fabric is ≤ 10 (tested according to relevant standards), effectively preventing the down from leaking out. In terms of warmth retention performance, after the cold-expandable particles expand, the thickness of the air layer between the fibers increases, and the deformation strips in the fabric contain an aerogel layer. Utilizing the low thermal conductivity of the aerogel, the fabric can maintain good warmth retention effect in cold environments. At the same time, the shrinkage and expansion performance of the aerogel layer during temperature changes ensure that the fabric not only has warmth retention performance but also has good lightness and softness performance. In terms of breathability and waterproof performance, through optimizing the woven structure and water-repellent finishing, the breathability of the fabric is < 10 mm / s (tested according to relevant standards), the moisture permeability reaches 10000 G / m 2 ·24H+, and the water repellency reaches level 4-5, achieving a good balance between breathability and waterproof performance and being able to meet the usage requirements in different environments.

[0051] In summary, the present invention applies cold-expandable particles to the foaming anti-down process of knitted materials. By utilizing the property of cold-expandable particles to expand when cooled, the fiber gaps are filled when the temperature decreases, effectively improving the anti-down performance and enhancing the warmth retention performance of the fabric simultaneously. The present invention realizes the improvement of multiple properties with a single material. At the same time, through the collaborative optimization of multiple process steps such as raw material pretreatment, mixing and spinning, foaming agent treatment, heat treatment, washing and drying, and secondary shaping, it ensures the good combination of cold-expandable particles and fiber materials, as well as the stable adhesion of the foaming agent layer, thereby achieving a balanced improvement in the anti-down, warmth retention, breathability, and waterproof performance of knitted materials, overcoming the problem of mutual restriction of various properties in traditional processes. And by precisely controlling the process parameters of each link, such as temperature, pressure, time, addition amount, etc., it ensures the stability and repeatability of the process, and high-quality anti-down yarns can be mass-produced to meet market demands.

[0052] The above are only the preferred embodiments of the present invention, and do not limit the patent scope of the present invention accordingly. Any equivalent structural transformation made under the inventive concept of the present invention by using the content of the specification and drawings of the present invention, or directly / indirectly applied to other related technical fields, is included in the patent protection scope of the present invention.

Claims

1. A foaming anti-down process of cold-expanded particles on knitted materials, characterized in that, It includes the following steps: S1. Select high-quality knitting fiber materials and screen cold expansion particles, and prepare a specific dispersant; S2. Add the cold expansion particles into the solution containing the dispersant, and form a dispersion liquid through high-speed stirring and ultrasonic treatment; S3. Clean and dry the knitting fiber materials. At the same time, during the spinning process, evenly mix the cold expansion particle dispersion liquid into the fiber materials, control the addition ratio and make yarns; S4. Place the yarns containing cold expansion particles in a vacuum spraying device, and perform 360° spraying with a special PU foaming adhesive. Control the spraying pressure, temperature and time. After spraying, let the yarns stand in a specific temperature and humidity environment; S5. Perform heat treatment on the standing yarns, and precisely control the pressure at the same time. Wash and low-temperature dry the heat-treated yarns; S6. Perform secondary shaping treatment on the dried yarns, control the shaping temperature, stretching ratio and time, and then perform quality inspection on the treated yarns.

2. The foaming anti-down process of cold-expanded particles on knitted materials according to claim 1, characterized in that, The knitting fiber material is polyamide fiber. When performing the cleaning treatment, use deionized water and a mild detergent, and dry it at a low temperature after washing. The drying temperature is 30 - 40°C.

3. The foaming anti-down process of cold-expanded particles on knitted materials according to claim 1, characterized in that, The particle size of the cold expansion particles is 20 - 50μm, the dispersant is sodium polyacrylate, the high-speed stirring speed is 1500 - 2000r / min, the stirring time is 30 - 40 minutes, the ultrasonic treatment power is 300 - 400W, and the treatment time is 20 - 30 minutes.

4. The foaming and down-proof process of cold-expanded particles on knitted materials according to claim 1, characterized in that, During the spinning process, the addition ratio of the cold expansion particle dispersion liquid is 3% - 5% of the mass of the fiber materials, the spinning speed is 500 - 800m / min, the spinning tension is 2 - 3cN / tex, and the spinning temperature is 20 - 25°C.

5. The foaming anti-down process of cold-expanded particles on knitted materials according to claim 1, characterized in that, The PU foaming adhesive is heated to 50 - 60°C before spraying, the stirring time is 20 - 30 minutes, the spraying pressure is 0.3 - 0.5MPa, the spraying temperature is 50 - 60°C, and the spraying time is 15 - 20 minutes.

6. The foaming anti-down process of cold-expanded particles on knitted materials according to claim 1, characterized in that, The standing temperature of the yarns in a specific temperature and humidity environment is 25 - 30°C, the standing humidity is 50% - 60%, and the standing time is 2 - 3 hours.

7. The foaming anti-down process of cold-expanded particles on knitted materials according to claim 1, characterized in that, The heat treatment temperature of the standing yarns is 80 - 100°C, the holding time is 15 - 20 minutes, and the pressure is controlled at 0.1 - 0.2MPa.

8. A foaming anti-down process of cold-expanded particles on knitted materials according to claim 1, characterized in that, When washing the heat-treated yarns, use a mild detergent and clean water. The detergent concentration is 0.3% - 0.5%, the washing temperature is 30 - 40°C, the washing time is 10 - 15 minutes, and the drying temperature is 40 - 50°C.

9. The foaming anti-down process of cold-expanded particles on knitted materials according to claim 1, characterized in that, The secondary shaping temperature of the dried yarns is 120 - 150°C, the stretching ratio is 10% - 15%, and the shaping time is 5 - 10 minutes.

10. The foaming anti-down process of cold-expanded particles on knitted materials according to claim 1, characterized in that, The quality inspection includes detecting the uniformity of the cold expansion particle distribution, the thickness and adhesion of the foaming adhesive layer, the strength and elasticity of the yarns. When the cold expansion particle distribution is uneven, adjust the preparation process or addition method of the dispersion liquid. When the thickness of the foaming adhesive layer does not meet the requirements, adjust the spraying pressure, temperature and time parameters.

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