Elastic cotton-like fabric and process for making the same

Abstract

The present application relates to a kind of elastic cotton-like fabric and its preparation process, the elastic cotton-like fabric is compounded by yarn A and yarn B, the yarn A is the POY chemical fiber or full-drawing filament chemical fiber of special section, the yarn B is elastic bicomponent filament.The yarn C of the yarn A of low shrinkage special section and the yarn B of elastic bicomponent is compounded, and the fabric is woven using the yarn C, and the shrinkage difference of yarn A and yarn B is made when dyeing, and the surface of fabric forms abundant cotton sense, can be industrialized production, excellent elasticity, has the function of quick-drying, cotton hand feeling is better.

Description

Technical Field

[0001] This invention relates to the field of fabric processing technology, and in particular to an elastic cotton-like fabric and its preparation process. Background Technology

[0002] Imitation cotton, a type of chemical fiber cotton, is also known as silk cotton by industry insiders. It is a relatively high-end variety of spray-bonded cotton products. Silk cotton fabric is fundamentally different from cotton and silk cotton fabric. Silk cotton fabric is a material that can replace down and plant cotton. As a clothing filling, it has a very good warmth retention effect. Compared with cotton fabric, it has the advantages of being soft to the touch, having good resilience, strong breathability, and being washable.

[0003] Elastic quick-drying cotton-like fabrics differ from ordinary polyester fabrics in their yarn compounding, weaving, and post-processing methods. Elasticity is defined as elongation ≥15% and recovery rate ≥85%. Quick-drying properties are defined as: water absorption speed (drip method): within 3 seconds; residual moisture content: <80% (within 30 minutes); <10% (after dehydration, within 90 minutes). Elastic fabrics on the market are generally made of polyester or nylon yarns covered with spandex.

[0004] For example, Chinese invention patent publication number CN104695206A discloses an elastic cotton-like fabric by covering spandex with nylon air-textured yarn. Although this method can produce elastic cotton-like fabric, the presence of spandex yarn results in poor color fastness. Summary of the Invention

[0005] To address the aforementioned technical deficiencies in the prior art, this invention provides an elastic cotton-like fabric and its preparation process, which can be industrially produced, exhibits excellent elasticity, quick-drying properties, and a good cotton-like feel, effectively solving the problems in the prior art.

[0006] To solve the above-mentioned technical problems, the technical solution provided by the present invention is as follows:

[0007] This invention discloses an elastic cotton-like fabric, which is composed of yarn A and yarn B. Yarn A is a POY chemical fiber with an irregular cross section or a fully drawn chemical fiber, and yarn B is an elastic bicomponent long fiber.

[0008] In any of the above schemes, it is preferred that the irregular cross-section is any one of triangular, octagonal, cross-shaped, flat, or hollow non-original cross-section.

[0009] In any of the above embodiments, it is preferred that the elastic fiber is a fiber composed of any combination or a single component of polyethylene terephthalate, polybutylene terephthalate, and polypropylene terephthalate.

[0010] Preferably, in any of the above embodiments, the luster of the elastic bicomponent long fibers is any one of gloss, semi-gloss, and matte; the unit area coverage coefficient of the elastic cotton-like fabric is 1200-6000; the elongation is ≥10%; the recovery rate is ≥70%; and using the dripping method, the water absorption rate of the elastic cotton-like fabric is <1 second, and the diffused residual moisture content is <75% after 30 minutes of dehydration and <5% after 90 minutes of dehydration.

[0011] Compared with the prior art, the beneficial effects of the present invention are as follows: The present invention uses a low-shrinkage profiled yarn A and an elastic bicomponent yarn B to form a woven fabric. During dyeing, the shrinkage difference between yarn A and yarn B creates a rich cotton feel on the fabric surface. After testing, the warp elongation of the elastic cotton-like fabric was measured to be 17.5%, the weft elongation to be 15.5%, the warp recovery to be 90.7%, the weft recovery to be 85.4%, and the water absorption rate to be less than 1 second. The residual moisture content was <70.99% (within 30 minutes) and <2.95% (after 90 minutes of dehydration). The present invention can be industrially produced, has excellent elasticity, quick-drying properties, and a good cotton feel.

[0012] Secondly, a process for preparing the aforementioned elastic cotton-like fabric, the method comprising the following steps:

[0013] Yarns A and B are combined to produce yarn C;

[0014] Sizing is applied to yarn C;

[0015] The sized yarn C is then warped using a warping machine.

[0016] After yarn C is placed on the warp beam, it is woven through heddles to obtain an elastic cotton-like fabric.

[0017] In any of the above embodiments, it is preferred that the elastic imitation cotton fabric is plain weave or twill weave, and the density of the elastic imitation cotton fabric is 50-300 yarns / cm, and the length of the yarn is 50-300cm.

[0018] In any of the above embodiments, the preparation process of the elastic imitation cotton fabric further includes dyeing and finishing the elastic imitation cotton fabric, wherein the dyeing and finishing includes the following steps:

[0019] The elastic imitation cotton fabric is pre-washed, then relaxed, and then dried and pre-shaped at high temperature. After pre-shaping, it is dyed, and then dried again. The elastic imitation cotton fabric is then impregnated with resin solution and finally post-shaped.

[0020] In any of the above embodiments, it is preferred that the pre-washing solution contains a surfactant, caustic soda, and a chelating dispersant, the pre-washing temperature is 70-95°C, the surfactant content in the washing solution is 1-3 g / L, the caustic soda content is 0.5-1.5 g / L, and the chelating dispersant content is 0.5-2 g / L.

[0021] In any of the above embodiments, the relaxation process preferably includes:

[0022] The process involves using a liquid flow scouring machine containing surfactants, caustic soda, and chelating dispersants. During the relaxation treatment of the elastic imitation cotton fabric in the liquid flow scouring machine, the temperature is controlled to rise to 120°C at a rate of 0.3–2.0°C / min, while continuous rubbing is performed. The surfactant content in the liquid flow scouring machine is 1–3 g / L, the caustic soda content is 1–6 g / L, and the chelating dispersant content is 0.5–2 g / L.

[0023] Preferably, in any of the above embodiments, the high-temperature drying includes:

[0024] Elastic imitation cotton fabrics are dried using a mesh dryer. During the drying process, the drying temperature is controlled at 100-130℃, and the speed of the mesh dryer is controlled at 15-40m / min. Before drying the elastic imitation cotton fabrics, they also need to be dehydrated.

[0025] In any of the above schemes, it is preferred that the pre-setting process uses a high-temperature setting machine to pre-set the elastic imitation cotton fabric, wherein the temperature of the high-temperature setting machine is controlled at 150 to 180 degrees Celsius and the speed of the high-temperature setting machine is controlled at 15 to 35 m / min.

[0026] In any of the above embodiments, it is preferred that when dyeing is performed after the pre-forming treatment, a liquid flow dyeing machine is used to dye the elastic imitation cotton fabric after the pre-forming treatment, and the temperature in the liquid flow dyeing machine is controlled at 120-135°C during dyeing. At the same time, polyethylene glycol ester polymer is added to the dyeing agent, and the content of polyethylene glycol ester polymer added to the dyeing agent is 1.5%.

[0027] In any of the above solutions, the preferred method for calculating yarn physical properties includes the following steps:

[0028] Step 1: Set the counter on the measuring instrument to 4000÷DEL, and hang the wound wire bundle on the measuring plate to read data L0 and L1; where L0 is the length of the wire bundle after hanging a 406.4g weight, and L1 is the length of the wire bundle after removing a 400g weight for one minute.

[0029] Step 2: Place the silk bundle with a 6.4g weight on it into boiling water and boil for 20 minutes. After boiling, remove the silk bundle, let it air dry, and read the data L2 and L3. L2 is the length of the silk bundle after hanging a 406.4g weight, and L3 is the length of the silk bundle after removing a 400g weight for one minute.

[0030] Step 3: Calculate using the following formula:

[0031]

[0032]

[0033]

[0034]

[0035] Potential shrinkage rate Lc(%) = Tc - Vc.

[0036] In any of the above embodiments, the preferred method for testing the elasticity of the elastic cotton-like fabric under dry heat conditions includes the following steps:

[0037] Step 1: Take a test yarn strand on the YG086 yarn length measuring machine. The number of turns of the yarn strand is calculated using the following formula: Number of turns = 7000 ÷ nominal linear density of the sample (DEN) ÷ 2; where the total linear density of the yarn strand is set to 7000DEN, rounded to the nearest whole number.

[0038] Step 2: Hang the wound strands of yarn onto the sample holder in sequence, and place the sample holder into the YG368 fully automatic crimp shrinkage tester. Select "composite yarn dry heat test", start the instrument to apply force to the strands of yarn, and measure the length LA of the first pass.

[0039] Step 3: After testing all the samples in sequence, remove the sample holder;

[0040] Step 4: Place the sample holder in the YG368 special oven, set the temperature to 121±1℃, and heat treat for 5±1 minutes. During the heat treatment, hang a 10.5g weight on the wire.

[0041] Step 5: After heat treatment, remove the sample holder, balance it, and allow it to cool naturally for 10 minutes.

[0042] Step 6: After cooling, place the sample holder into the YG368 fully automatic curl shrinkage rate tester for a second test; first, measure the length LB with a 10.5g weight, and then measure the length LC when a force of 700g is applied.

[0043] Step 7: Automatically calculate using the YG368 fully automatic curl shrinkage rate tester:

[0044] Dry heat curl elongation CP = (LC-LB) / LB × 100%;

[0045] Dry heat shrinkage rate CS=(LA-LC) / LA×100%;

[0046] Dry heat curl shrinkage rate CI = (LC - LB) / LC × 100%.

[0047] In the elastic fabric described in this embodiment, the main indicator of elastic performance under dry heat conditions is dry heat crimp elongation CP ≥ 20%.

[0048] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0049] This invention provides an elastic cotton-like fabric in which the warp and weft yarns contain 100% recycled bicomponent polyester long fibers, giving the fabric superior resilience, lightweight stretch, and unrestricted freedom of movement. It is a fabric that combines comfort, breathability, health, environmental protection, and fashion, meeting people's pursuit of extremely high wearing comfort while protecting nature and promoting recycling.

[0050] Compared with the prior art, the beneficial effects of the present invention are as follows: The present invention uses a low-shrinkage profiled yarn A and an elastic bicomponent yarn B to form a woven fabric. During dyeing, the shrinkage difference between yarn A and yarn B creates a rich cotton feel on the fabric surface. The present invention improves the water absorption speed of polyester fabric by adding polyethylene glycol ester polymer to the dyeing agent during the dyeing of elastic imitation cotton fabric. Through the dyeing and sweat-absorbing processing method, the processing cost of elastic imitation cotton fabric can be effectively reduced and the processing time of elastic imitation cotton fabric can be shortened. Attached Figure Description

[0051] The accompanying drawings are provided to further illustrate the present invention and, together with the embodiments thereof, are used to explain the present invention, but do not constitute a limitation thereof.

[0052] Figure 1 This is a flowchart of a preparation process for an elastic cotton-like fabric provided in an embodiment of the present invention;

[0053] Figure 2 This is a flowchart of the dyeing process in the preparation process of an elastic imitation cotton fabric provided in an embodiment of the present invention. Detailed Implementation

[0054] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0055] To better understand the above technical solutions, the technical solutions of the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0056] Example 1:

[0057] In the elastic imitation cotton fabric described in the embodiments of the present invention, the elastic imitation cotton fabric is composed of yarn A and yarn B. Yarn A is a POY chemical fiber with an irregular cross section or a fully drawn chemical fiber, and yarn B is an elastic bicomponent long fiber. The irregular cross section can be any one of triangular, octagonal, cross, or flat.

[0058] In the elastic imitation cotton fabric described in this embodiment of the invention, POY chemical fiber is pre-oriented yarn, which refers to chemical fiber filaments that are not fully stretched and whose orientation degree is between that of unoriented yarn and drawn yarn, obtained by high-speed spinning. Fully stretched yarn is obtained by introducing a stretching effect during the spinning process, which can obtain a wound yarn with high orientation degree and medium crystallinity. It is a fully stretched yarn. Commonly, there are fully stretched yarns of polyester and nylon, which are all chemical fiber filaments. FDY fabric has a smooth and soft hand feel and is often used to weave imitation silk fabrics.

[0059] In the elastic cotton-like fabric described in the embodiments of the present invention, the elastic bicomponent long fiber is any one of SPH fiber, polybutylene terephthalate fiber and T400 composite fiber, and the luster of the elastic bicomponent long fiber is any one of gloss, semi-gloss and matte. The bicomponent fiber is also known as composite fiber, which is composed of two different fiber-forming polymers or similar fiber-forming polymers with different properties, and has high strength and stiffness.

[0060] In the preparation process of the elastic cotton-like fabric described in this embodiment of the invention, the method includes the following steps:

[0061] Yarn A and yarn B are compounded to form yarn C. Yarn C is then drawn using a warp-drawing machine. Yarn C is then wound onto a warp beam and woven after heddle threading to obtain an elastic cotton-like fabric. During the weaving operation, the elastic cotton-like fabric is plain or twill, and the weaving density is 50 threads / cm.

[0062] In the preparation process of the elastic imitation cotton fabric described in the embodiments of the present invention, plain weave refers to a fabric formed by the interlacing of warp and weft yarns in an up-down pattern, where the numerator represents the warp weave point and the denominator represents the weft weave point. This type of fabric is characterized by many interlacing points, strong texture, crispness, smooth surface, relatively lightness, good wear resistance, and good breathability. Twill weave refers to a structure in which the interlacing points of warp and weft yarns present a diagonal line at a certain angle on the fabric surface. The warp and weft interlacing of twill weave is less than that of plain weave, so it is not as strong as plain weave fabric, but twill weave fabric has a soft and smooth hand feel.

[0063] The preparation process of the elastic imitation cotton fabric described in the embodiments of the present invention further includes dyeing the elastic imitation cotton fabric, the dyeing comprising the following steps:

[0064] The elastic imitation cotton fabric is pre-washed, then relaxed, then dried at high temperature, then pre-shaped, then dyed, then dried again, then impregnated with resin solution, and finally post-shaped.

[0065] In the preparation process of the elastic imitation cotton fabric described in the embodiments of the present invention, the elastic imitation cotton fabric is woven from POY chemical fiber, fully drawn chemical fiber and elastic bicomponent long fiber. The POY chemical fiber, fully drawn chemical fiber and elastic bicomponent long fiber have a certain shrinkage. In order to avoid the garments made from the elastic imitation cotton fabric having a standard size during production, it is necessary to perform a pre-washing treatment during the production and processing of the elastic imitation cotton fabric.

[0066] In the preparation process of the elastic imitation cotton fabric described in the embodiments of the present invention, during the pre-washing treatment, a surfactant, caustic soda and a chelating dispersant are added to the washing solution. The temperature of the pre-washing treatment is 70-95°C. The content of the surfactant in the washing solution is 1 g / L, the content of the caustic soda is 0.5 g / L, and the content of the chelating dispersant is 0.5 g / L.

[0067] In the preparation process of the elastic imitation cotton fabric described in the embodiments of the present invention, the relaxation treatment is carried out using a liquid flow scouring machine, and the liquid flow scouring machine contains surfactants, caustic soda and chelating dispersants. When the elastic imitation cotton fabric is relaxed in the liquid flow scouring machine, the temperature inside the liquid flow scouring machine is controlled to rise to 120°C at a heating rate of 0.3 to 2.0 degrees / min, while continuous rubbing is performed.

[0068] In the preparation process of the elastic imitation cotton fabric described in the embodiments of the present invention, the content of the surfactant added in the liquid flow scouring machine is 1g / L, the content of the caustic soda added in the liquid flow scouring machine is 1g / L, and the content of the chelating dispersant added in the liquid flow scouring machine is 0.5g / L.

[0069] In the preparation process of the elastic imitation cotton fabric described in the embodiments of the present invention, the elastic imitation cotton fabric is dried using a mesh dryer. During the drying process, the drying temperature is controlled at 100-130℃, and the speed of the mesh dryer is controlled at 15-40m / min.

[0070] In the preparation process of the elastic imitation cotton fabric described in the embodiments of the present invention, before drying the elastic imitation cotton fabric, it is necessary to dehydrate the elastic imitation cotton fabric to improve the drying efficiency. Furthermore, in the pre-setting process, a high-temperature setting machine is used to pre-set the elastic imitation cotton fabric, wherein the temperature of the high-temperature setting machine is controlled at 150 to 180 degrees Celsius and the speed of the high-temperature setting machine is controlled at 15 to 35 m / min.

[0071] In the preparation process of the elastic imitation cotton fabric described in this embodiment of the invention, the pre-forming treatment is a process in which synthetic fibers such as polyester and their blended fabrics are heated to the required temperature under appropriate tension, heated at this temperature for a certain time, and then rapidly cooled. Through the pre-forming treatment, the size of the elastic imitation cotton fabric can be fixed, and the setting temperature of the finished elastic imitation cotton fabric can be reduced, thereby increasing the thickness and elasticity of the finished fabric. In addition, the elastic imitation cotton fabric in this invention is woven from two different fibers, and the shrinkage rate and elasticity of the two fibers are different. Through the pre-forming treatment, the fabric deformation can be prevented, and the elastic imitation cotton fabric can be prevented from producing creases during dyeing.

[0072] In the preparation process of the elastic imitation cotton fabric described in the embodiments of the present invention, the dyeing is carried out by dyeing the elastic imitation cotton fabric after pre-forming treatment using a liquid flow dyeing machine. During the dyeing process, the temperature in the liquid flow dyeing machine is controlled at 120-135°C. At the same time, polyethylene glycol ester polymer is added to the dyeing agent, and the content of polyethylene glycol ester polymer added to the dyeing agent is 1.5%.

[0073] In the preparation process of the elastic imitation cotton fabric described in this embodiment of the invention, polyethylene glycol is a high molecular polymer that is non-irritating, slightly bitter, has good water solubility, and good compatibility with many organic components. It also has excellent lubricity, moisturizing properties, dispersibility, and adhesion. It can be used as an antistatic agent and softener. Adding polyethylene glycol ester polymers during dyeing can accelerate the water absorption rate of the elastic imitation cotton fabric, thereby speeding up the dyeing process. It can also act as an antistatic agent and softener, effectively reducing the processing cost of the elastic imitation cotton fabric.

[0074] In the preparation process of the elastic imitation cotton fabric described in this embodiment of the invention, in the resin impregnation process, a mesh resin equipment is used to impregnate the dyed elastic imitation cotton fabric with resin. A mixture of antistatic agent and pH adjuster is added to the resin tank of the mesh resin equipment. When the mesh resin equipment is in use, the drying temperature is controlled at 125°C. By impregnating the dyed elastic imitation cotton fabric with resin and adding antistatic agent and pH adjuster, the low static electricity and yellowing of the elastic imitation cotton fabric can be guaranteed.

[0075] In the preparation process of the elastic imitation cotton fabric described in the embodiments of the present invention, in the post-setting treatment, a setting machine is used to perform post-setting treatment on the elastic imitation cotton fabric, and in the post-setting treatment, the setting temperature is controlled below 150°C to prevent the sublimation of polyethylene glycol polymer chemicals, thereby maintaining the natural appearance of the fabric and its excellent water absorption performance. The post-setting treatment process uses a setting machine to control the width and overfeed to maintain the consistency of the fabric's width, density, and weight.

[0076] Example 2:

[0077] The preparation process of the elastic cotton-like fabric described in this embodiment of the invention includes the following steps:

[0078] Yarns A and B are compounded to form yarn C, which is then drawn using a warp-drawing machine. Yarn C is then wound onto a warp beam and woven after heddle threading to obtain an elastic cotton-like fabric. The method also includes dyeing and finishing the elastic cotton-like fabric. Before dyeing and finishing, the elastic cotton-like fabric needs to be unwound. After unwound, the fabric needs to be desized. After desizing, the elastic cotton-like fabric needs to be pre-shrinked based on the desizing effect and shrinkage rate.

[0079] In the preparation process of the elastic imitation cotton fabric described in this embodiment of the invention, the dyeing includes the following steps:

[0080] The elastic cotton-like fabric undergoes a relaxation treatment, followed by drying and pre-setting. After pre-setting, it is dyed, dried again, impregnated with resin, and finally post-setting. Following dyeing and finishing, the elastic cotton-like fabric is subjected to performance testing. The tested properties include: warp elongation, weft elongation, warp recovery, weft recovery, and water absorption rate.

[0081] In the preparation process of the elastic cotton-like fabric described in this embodiment of the invention, after testing, the warp elongation of the elastic cotton-like fabric was measured to be 17.5%, the weft elongation to be 15.5%, the warp recovery to be 90.7%, the weft recovery to be 85.4%, and the water absorption rate to be less than 1 second. The residual moisture content of the elastic cotton-like fabric was <70.99% (within 30 minutes) and <2.95% (after 90 minutes of dehydration).

[0082] Compared with the prior art, the beneficial effects of the present invention are as follows: The present invention uses a low-shrinkage profiled yarn A and an elastic bicomponent yarn B to form a woven fabric. During dyeing, the shrinkage difference between yarn A and yarn B creates a rich cotton feel on the fabric surface. The present invention improves the water absorption speed of polyester fabric by adding polyethylene glycol ester polymer to the dyeing agent during the dyeing of elastic imitation cotton fabric, which can effectively reduce the processing cost of elastic imitation cotton fabric and shorten the processing time of elastic imitation cotton fabric.

[0083] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. An elastic cotton-like fabric, characterized in that: The elastic cotton-like fabric C is composed of yarn A and yarn B. Yarn A is a fully drawn chemical fiber with an irregular cross-section, and yarn B is an elastic bicomponent long fiber. The elastic bicomponent long fiber is either SPH fiber or T400 composite fiber. The unit area coverage coefficient of the elastic cotton-like fabric is 1200-6000, the elongation is ≥10%, and the recovery rate is ≥70%. Using the drip method, the water absorption speed of the elastic cotton-like fabric is <1 second, and the diffusion residual moisture rate is <75% after 30 minutes of dehydration and <5% after 90 minutes of dehydration. The structure of the elastic cotton-like fabric is plain weave or twill weave, with a density of 50 threads / cm. When dyeing the elastic cotton-like fabric, a liquid flow dyeing machine is used, and the dyeing temperature is controlled at 120-135℃. 1.5% polyethylene glycol ester polymer is added to the dyeing agent. Before dyeing and finishing the elastic cotton-like fabric, unwinding, desizing, and pre-shrinking treatments are required sequentially.

2. The elastic cotton-like fabric according to claim 1, characterized in that: The irregular cross-section can be any one of triangular, octagonal, cross-shaped, or flat.

3. The elastic cotton-like fabric according to claim 2, characterized in that: The luster of the elastic bicomponent long fiber is any one of gloss, semi-gloss, and matte.

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