Recycled cotton air layer knitted fabric and preparation method thereof

Abstract

The present invention provides a regenerated cotton air-layer knitted fabric and a preparation method thereof. The fabric comprises an inner layer, an intermediate connecting layer, and an outer layer. The inner and outer layers are each woven from blended yarns consisting of at least regenerated cotton fibers and organic cotton fibers. The intermediate connecting layer is woven from low-F hot-melt polyester yarn. The regenerated cotton fibers account for 5-15% by weight of the blended yarn, and the organic cotton fibers account for 85-95% by weight of the blended yarn. The present invention utilizes regenerated cotton fibers and organic cotton fibers to weave a fabric with an air-layer structure. The connecting yarn of the air-layer structure utilizes low-F hot-melt polyester yarn, significantly improving the overall anti-pilling performance of the fabric. Furthermore, the fabric woven from regenerated cotton fibers does not require dyeing, making it more environmentally friendly.

Description

Technical Field

[0001] The present invention relates to the field of textile technology, in particular to a regenerated cotton air layer knitted fabric and a preparation method thereof. Background Art

[0002] At present, major brand customers are flocking to environmentally friendly products, and such products are also very hot in the market. Organic cotton and recycled polyester products have become the dominant ones in the market. The application of recycled cotton breaks the current recycling pattern and is loved by major brand customers.

[0003] Turning waste into treasure involves shredding and loosening old clothing and garment scraps to create fibers, which are then blended with ordinary cotton fibers to form yarn, which is then woven into knitted fabrics. Because recycled cotton fibers are inherently colored, these products do not require dyeing and are therefore environmentally friendly. However, due to the nature of the raw materials, the pilling resistance of recycled cotton products has been a subject of considerable concern and criticism, particularly in thermal insulation fabrics with air-layer structures. The high hairiness of recycled cotton fibers results in poor pilling resistance in these structures. Furthermore, since recycled cotton fibers are short fibers, they are susceptible to external forces during wear or washing, which can cause the fabric to lose elasticity, deform, and wrinkle. Therefore, the use of recycled cotton fibers in fabrics with air-layer structures is subject to significant limitations.

[0004] The prior art with publication number CN112046122 A discloses a method for preparing 3D recycled cotton knitted fabrics, which adopts the method of secondary spinning of waste fabrics and scraps as raw materials to produce recycled cotton knitted fabrics; because the waste fabrics themselves have colors, they can be made into recycled cotton fibers and blended with cotton fibers through classification, opening, combing and removing impurities, which reduces the amount of raw materials used, eliminates the dyeing step, and achieves the purpose of environmental protection. This prior art has at least the following problems: 1) Since the polyester yarn used is ordinary polyester yarn with a nearly circular cross-section (such as Figure 1 (as shown), the surface is smooth, the friction resistance is small, and the fibers are easy to slide, making the resulting fabric easy to pilling; 2) The air layer of the fabric is made by a glue-setting machine. The fabric is easy to degummed and deformed after being washed for a long time, making the fabric have no thermal insulation performance; (3) The fabric is very easy to lose elasticity, deform and wrinkle when worn and washed by external forces. Summary of the Invention

[0005] In light of this, the present invention aims to provide a recycled cotton air-layer knitted fabric and its preparation method. This aims to address the existing problems of the fabric being prone to pilling due to the use of ordinary polyester yarn with a nearly circular cross-section, a smooth surface, low friction resistance, and easy interfiber sliding. Furthermore, the fabric's air layer is glued in a glue-setting machine, which makes it prone to degumming and deformation after prolonged washing. Furthermore, the fabric is prone to loss of elasticity, deformation, and wrinkling due to external forces during wearing and washing.

[0006] To achieve the above object, the technical solution of the present invention is achieved as follows:

[0007] A regenerated cotton air layer knitted fabric comprises an inner layer, an intermediate connecting layer, and an outer layer, wherein the inner layer and the outer layer are respectively woven from blended yarns consisting of at least regenerated cotton fibers and organic cotton fibers, and the intermediate connecting layer is woven from low-F hot-melt polyester yarns, wherein the regenerated cotton fibers account for 5 to 15% by weight of the blended yarns, and the organic cotton fibers account for 85 to 95% by weight of the blended yarns.

[0008] In this setting, by using low-F hot-melt polyester yarn, the friction resistance between the yarn and the blended yarn is increased, fiber sliding is reduced, and the pilling phenomenon caused by friction is reduced, so that the fabric containing recycled cotton fiber has good anti-pilling performance, and the air layer of the fabric is more firmly connected to the inner layer / outer layer through weaving.

[0009] Furthermore, the organic cotton fiber, regenerated cotton fiber and spandex yarn form a core-spun yarn, wherein the organic cotton fiber and regenerated cotton fiber are mixed as the outer layer of the core-spun yarn, the spandex yarn serves as the core layer of the core-spun yarn, and there are two polyester antistatic yarns, which are cross-wrapped on the outer periphery of the core-spun yarn composed of regenerated cotton fiber, organic cotton fiber and spandex yarn.

[0010] Because recycled cotton fibers are obtained from scraps and spun into yarn, their strength and softness are significantly reduced. By adding spandex to blended yarns containing recycled cotton, the elasticity and softness of the yarns are increased. Furthermore, the addition of antistatic yarn increases the yarn's strength and conductivity, effectively reducing the formation of pilling caused by static electricity during subsequent use.

[0011] Furthermore, when the low-F hot-melt polyester yarn is subjected to high temperature, the F number will be melted and become 1F.

[0012] The connecting thread of the air layer in this setting adopts 36F hot-melt polyester thread, which can make the fabric more regular and compact, and the air layer is not easy to deform, while greatly improving the overall anti-pilling performance of the fabric.

[0013] Furthermore, the minimum cycle weaving structure of the fabric is 3 routes, and the arrangement of the knitting needles in the weaving structure is ABAB for the upper needle disc and BABA for the lower needle cylinder, where A represents high heel needles and B represents low heel needles. The first route is a tuck tissue, the second route is a loop tissue, and the lower needle cylinder is a floating thread tissue, the third route is a floating thread tissue, and the lower needle cylinder is a loop tissue, wherein the first route uses low-F hot-melt polyester yarn, and the second and third routes use blended yarns composed of recycled cotton fibers and organic cotton fibers, or blended yarns composed of recycled cotton fibers, organic cotton fibers, polyester antistatic yarns, and spandex yarns.

[0014] This setting can form an integrated air layer structure for the fabric, making the fabric less likely to deform and the air layer structure stable, giving the fabric better warmth retention.

[0015] Furthermore, the preparation of the blended yarn adopts the following steps: recovery and opening → material selection → disinfection → carding → drawing process → roving process → spun yarn process → wrapping process → winding process.

[0016] A method for preparing a recycled cotton air layer knitted fabric, the method being used to prepare the above-mentioned fabric, comprising the following steps:

[0017] A. Yarn preparation: prepare blended yarn and low F hot-melt polyester yarn;

[0018] B. Weaving: Use 24G double-sided weft knitting circular machine to weave blended yarn and low F hot-melt polyester yarn into grey fabric;

[0019] C. Anti-wrinkle finishing of blanks.

[0020] Furthermore, the anti-wrinkle finishing of the blank comprises the following steps:

[0021] (1) Immersing the blank in a fabric pretreatment solution and rolling it through a rolling mill;

[0022] (2) The blank rolled by the rolling mill is dried to obtain the recycled cotton air layer knitted fabric.

[0023] Furthermore, the pretreatment solution is a mixture of N-methyldiethanolamine, citric acid and water.

[0024] Furthermore, the weight ratio of N-methyldiethanolamine, citric acid and water is 5-15:10-20:70-85.

[0025] Furthermore, the liquid content of the billet rolled by the rolling mill in step (2) is 60 to 100%.

[0026] Furthermore, the thickness of the low-F hot-melt polyester yarn is 50-100D.

[0027] Furthermore, the thickness of the middle connecting side is greater than the thickness of the outer layer or the inner layer.

[0028] Furthermore, the yarn count of the blended yarn is 20-40s.

[0029] Furthermore, the thickness of the low-F hot-melt polyester yarn is 75D / 36F.

[0030] Compared with the prior art, the recycled cotton air layer knitted fabric and its preparation method described in the present invention have the following advantages:

[0031] 1) The recycled cotton content in the blended yarn of the present invention cannot be too high. If it exceeds 15%, holes are easily generated when the cloth is opened, resulting in a large number of blank defects. Moreover, after washing, a large amount of lint will appear in the woven fabric, which will reduce the user experience.

[0032] 2) The yarn of the present invention adopts the siro-compact spinning method, which greatly reduces hairiness. When the recycled cotton content exceeds 15%, the anti-pilling performance of the fabric will be affected. The reason is that the recycled cotton fiber is made from waste cloth or scraps. The fiber is shorter and more damaged than normal fiber. Therefore, when recycled cotton fiber is added to the spinning process, the strength of the yarn will be reduced and the hairiness will increase. The use of siro-compact spinning and the control of the recycled cotton content greatly reduce the amount of harmful hairiness, thereby improving the anti-pilling performance of the fabric.

[0033] 3) The present invention performs anti-wrinkle finishing on the blank, so that the hydroxyl groups of the cotton fibers in the fabric react with citric acid under the action of N-methyldiethanolamine, thereby further enhancing the stability of the regenerated cotton fibers and preventing the regenerated cotton fibers from being washed out after washing due to the poor strength of the scraps. In addition, citric acid and N-methyldiethanolamine are environmentally friendly raw materials and will not cause pollution to the environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 This is a schematic diagram of the structure of the polyester yarn with a circular cross-section structure in contact with the blended yarn in the prior art;

[0035] Figure 2 This is a schematic structural diagram of the contact between the special-shaped thermal fuse and the blended yarn of the present invention;

[0036] Figure 3 This is a knitting arrangement diagram of the regenerated cotton air layer knitted fabric of the present invention;

[0037] Figure 4 This is a triangle arrangement diagram of the regenerated cotton air layer knitted fabric of the present invention.

[0038] Description of Reference Numerals

[0039] 1- blended yarn, 2- polyester yarn with circular cross-section structure, 3- special-shaped hot-melt yarn. DETAILED DESCRIPTION

[0040] In order to make the above-mentioned objects, features and advantages of the present invention more clearly understood, the following is a detailed description of the specific embodiments of the present invention with reference to the accompanying drawings. Lower needle tuck

[0041] Example 1

[0042] like Figure 2-Figure 4As shown, this embodiment provides a recycled cotton air layer knitted thermal fabric, comprising an inner layer, an intermediate connecting layer, and an outer layer, wherein the inner layer and the outer layer are both woven from blended yarns consisting of at least regenerated cotton fibers and organic cotton fibers, and the intermediate connecting layer is woven from low-F hot-melt polyester yarn, wherein the regenerated cotton fibers account for 5 to 15% of the weight percentage of the blended yarn, and the organic cotton fibers account for 85 to 95% of the weight percentage of the blended yarn.

[0043] Specifically, when the low-F hot-melt polyester yarn is subjected to high temperature, the F number will be melted and become 1F.

[0044] Specifically, the organic cotton fiber, regenerated cotton fiber and spandex yarn constitute a core-spun yarn, wherein the organic cotton fiber and regenerated cotton fiber are mixed as the outer layer of the core-spun yarn, the spandex yarn serves as the core layer of the core-spun yarn, and there are two polyester antistatic yarns, which are cross-wrapped on the outer periphery of the core-spun yarn composed of regenerated cotton fiber, organic cotton fiber and spandex yarn.

[0045] Because recycled cotton fibers are obtained from scraps and spun into yarn, their strength and softness are significantly reduced. By adding spandex to blended yarns containing recycled cotton, the elasticity and softness of the yarns are increased. Furthermore, the addition of antistatic yarn increases the yarn's strength and conductivity, effectively reducing the formation of pilling caused by static electricity during subsequent use.

[0046] Preferably, the antistatic yarn accounts for 1% by weight of the blended yarn, the spandex yarn accounts for 1% by weight of the blended yarn, the regenerated cotton fiber accounts for 5% by weight of the blended yarn, and the organic cotton fiber accounts for 93% by weight of the blended yarn.

[0047] Specifically, the preparation method of the blended yarn comprises the following steps:

[0048] (1) Recycling and opening: waste textile scraps are recycled and placed in an opening machine. The opening machine can be used to open the recycled scraps. The opening machine can tear the large pieces of entangled scraps into small pieces or bundles by tearing them apart. At the same time, the loosening process is accompanied by mixing and removing impurities.

[0049] (2) Material selection: selecting scraps containing cotton cloth from the scraps after opening;

[0050] (3) Disinfection: Soak the selected scraps in a disinfectant for a period of time, and then put them into boiling water, so as to use the disinfectant and boiling water to eliminate common pathogenic microorganisms such as bacteria and viruses contained in the scraps;

[0051] (4) Combing: The selected scraps and organic cotton fibers are placed in a carding machine, and the selected scraps are combed into single fibers and formed into a mesh fiber layer, and then assembled into a mixed fiber strip. The carding machine has a cylinder speed of 330 r / min, a licker-in speed of 800 r / min, a flat plate linear speed of 81 mm / min, and a doffer speed of 20 r / min.

[0052] (5) Drawing process: The mixed fiber strips are mixed by three drawing processes: FA311-FA306A drawing equipment is used, the design process speed is 197-201 m / min, the first roller gripping distance is 47 mm × 53 mm, the second drawing roller gripping distance is 47 mm × 53 mm, and the last drawing roller gripping distance is 43.5 mm × 47 mm;

[0053] The first drawing process uses 8 strands for drawing, with a total draft ratio of 7.8-8.2 and a rear draft ratio of 1.6-1.8; the second drawing process uses 8 strands for drawing, with a total draft ratio of 7.8-8.2 and a rear draft ratio of 1.3-1.5; the final drawing process uses 8 strands for drawing, with a total draft ratio of 7.8-8.2 and a rear draft ratio of 1.3-1.5. Humidification should be carried out during the drawing process to ensure that the actual moisture regain is not lower than the specified moisture regain.

[0054] (6) Roving process: the roving weight is 3 g / 10 m, the draft ratio is 10.33, the draft ratio in the rear zone is 1.24, the twist coefficient is 66, the roller grip distance is 51 mm × 68 mm, and the spindle speed is 560 rpm;

[0055] (7) Spinning process: Spinning is carried out by a spinning frame, and the roving and spandex yarn of step (6) are fed into the double bell mouth behind the Siro compact spinning frame to form a core-spun structure, which is outputted by the front roller and twisted and wound to obtain the spun yarn, wherein the spacing between the condensation grooves of the Siro compact spinning is between 1.2 mm, the center distance between the double bell mouths is 10 mm, and the hole spacing is 4 mm; in order to ensure the negative pressure required for Siro compact spinning, the motor of the negative pressure fan is 60 Hz / 5.5 kW, and the negative pressure value of each negative pressure suction groove is 2300 Pa-2700 Pa, ensuring that the connection state of each interface is good and there is no hanging or blocking phenomenon inside; the roller holding distance is 41.5 mm × 65 mm, the spindle speed is 11000-12000 rpm, and the drafting multiple of the drafting rear zone of the spinning frame is 1.20-1.30;

[0056] (8) Wrapping process: Wrapping the antistatic polyester yarn on the spun yarn obtained in step (7), the antistatic wrapping effect has the effect of antistatic and reducing the generation of hairiness;

[0057] (9) Winding process: The blended compact siro spinning machine has a winding speed of 1100-1400 m / min and the equipment model is an Autoconer 338 automatic winder to prepare a blended yarn containing recycled cotton;

[0058] Furthermore, the relative humidity of the production environment of the above steps is 52%-58%.

[0059] As another embodiment of the present application, the intermediate layer may also use a special-shaped thermal fuse, such as Figure 2 This setting can reduce the contact area between fibers, reduce the sliding between fibers, and improve the anti-pilling performance.

[0060] Example 2

[0061] This embodiment provides a recycled cotton air layer knitted thermal fabric, including an inner layer, an intermediate connecting layer, and an outer layer. The inner layer and the outer layer are woven from blended yarns composed of recycled cotton fibers and organic cotton fibers, respectively, and the intermediate connecting layer is woven from low-F hot-melt polyester yarn.

[0062] Specifically, the regenerated cotton fiber accounts for 5% by weight of the blended yarn, and the organic cotton fiber accounts for 95% by weight of the blended yarn.

[0063] Specifically, the fabric is prepared by the following processing method:

[0064] A. Yarn count preparation: Prepare blended yarn and low-F hot-melt polyester yarn, where the blended yarn includes recycled cotton fiber and organic cotton fiber;

[0065] B. Weaving: Use 24G double-sided weft knitting circular machine to weave blended yarn and low F hot-melt polyester yarn into grey fabric;

[0066] C. Anti-wrinkle finishing of blanks:

[0067] (1) Immersing the blank in a fabric pretreatment solution and rolling it through a rolling mill;

[0068] (2) repeating step (1) several times, until the fabric has a liquid carrying rate of 60% after rolling;

[0069] (3) drying the fabric obtained in step (2); the drying temperature is 120° C. and the drying time is 3 minutes, thereby obtaining a regenerated cotton air layer knitted fabric.

[0070] Example 3

[0071] The difference between this embodiment and embodiment 2 is as follows:

[0072] Specifically, the regenerated cotton fiber accounts for 10% by weight of the blended yarn, and the organic cotton fiber accounts for 90% by weight of the blended yarn.

[0073] Example 4

[0074] The difference between this embodiment and embodiment 2 is as follows:

[0075] Specifically, the regenerated cotton fiber accounts for 15% of the weight of the blended yarn, and the organic cotton fiber accounts for 85% of the weight of the blended yarn.

[0076] Example 5

[0077] The difference between this embodiment and embodiment 2 is as follows:

[0078] Specifically, the regenerated cotton fiber accounts for 17% of the weight of the blended yarn, and the organic cotton fiber accounts for 83% of the weight of the blended yarn.

[0079] Example 6

[0080] The difference between this embodiment and embodiment 2 is as follows:

[0081] This embodiment provides a recycled cotton air layer knitted thermal fabric, including an inner layer, an intermediate connecting layer, and an outer layer. The inner layer and the outer layer are respectively woven from blended yarns consisting of recycled cotton fibers, organic cotton fibers, antistatic yarns, and spandex yarns, and the intermediate connecting layer is woven from low-F hot-melt polyester yarns.

[0082] Specifically, the organic cotton fiber, regenerated cotton fiber and spandex yarn constitute a core-spun yarn, wherein the organic cotton fiber and regenerated cotton fiber are mixed as the outer layer of the core-spun yarn, the spandex yarn serves as the core layer of the core-spun yarn, and there are two polyester antistatic yarns, which are cross-wrapped on the outer periphery of the core-spun yarn composed of regenerated cotton fiber, organic cotton fiber and spandex yarn.

[0083] Specifically, the antistatic yarn accounts for 2% of the weight of the blended yarn, the spandex yarn accounts for 2% of the weight of the blended yarn, the regenerated cotton fiber accounts for 7% of the weight of the blended yarn, and the organic cotton fiber accounts for 89% of the weight of the blended yarn.

[0084] Specifically, the fabric is prepared by the following processing method:

[0085] B. Yarn preparation: Prepare blended yarn and low-F hot-melt polyester yarn, where the blended yarn includes recycled cotton fiber, spandex yarn, antistatic yarn, and organic cotton fiber;

[0086] B. Weaving: Use 24G double-sided weft knitting circular machine to weave blended yarn and low F hot-melt polyester yarn into grey fabric;

[0087] C. Anti-wrinkle finishing of blanks:

[0088] (1) Immersing the blank in a fabric pretreatment solution and rolling it through a rolling mill;

[0089] (2) repeating step (1) several times, until the fabric has a liquid carrying rate of 60% after rolling;

[0090] (3) drying the fabric obtained in step (2); the drying temperature is 120° C. and the drying time is 3 minutes, thereby obtaining a regenerated cotton air layer knitted fabric.

[0091] Furthermore, the pretreatment solution is a mixture of 5 parts of N-methyldiethanolamine, 10 parts of citric acid, and 85 parts of water.

[0092] Example 7

[0093] This embodiment provides a recycled cotton air layer knitted thermal fabric, including an inner layer, an intermediate connecting layer, and an outer layer. The inner layer and the outer layer are respectively woven from blended yarns consisting of recycled cotton fibers, organic cotton fibers, antistatic yarns, and spandex yarns, and the intermediate connecting layer is woven from low-F hot-melt polyester yarns.

[0094] Specifically, the organic cotton fiber, regenerated cotton fiber and spandex yarn constitute a core-spun yarn, wherein the organic cotton fiber and regenerated cotton fiber are mixed as the outer layer of the core-spun yarn, the spandex yarn serves as the core layer of the core-spun yarn, and there are two polyester antistatic yarns, which are cross-wrapped on the outer periphery of the core-spun yarn composed of regenerated cotton fiber, organic cotton fiber and spandex yarn.

[0095] Specifically, the antistatic yarn accounts for 2.5% of the weight of the blended yarn, the spandex yarn accounts for 2.5% of the weight of the blended yarn, the regenerated cotton fiber accounts for 9% of the weight of the blended yarn, and the organic cotton fiber accounts for 86% of the weight of the blended yarn.

[0096] Specifically, the fabric is prepared by the following processing method:

[0097] A. Yarn preparation: Prepare blended yarn and low-F hot-melt polyester yarn, where the blended yarn includes recycled cotton fiber, spandex yarn, antistatic yarn, and organic cotton fiber;

[0098] B. Weaving: Use 24G double-sided weft knitting circular machine to weave blended yarn and low F hot-melt polyester yarn into grey fabric;

[0099] C. Anti-wrinkle finishing of blanks:

[0100] (1) Immersing the blank in a fabric pretreatment solution and rolling it through a rolling mill;

[0101] (2) repeating step (1) several times until the fabric has a liquid carrying rate of 80% after rolling;

[0102] (3) drying the fabric obtained in step (2); the drying temperature is 150° C. and the drying time is 2 minutes, thereby obtaining a regenerated cotton air layer knitted fabric.

[0103] Furthermore, the pretreatment solution is a mixture of 10 parts of N-methyldiethanolamine, 10 parts of citric acid, and 80 parts of water.

[0104] Example 8

[0105] This embodiment provides a recycled cotton air layer knitted thermal fabric, including an inner layer, an intermediate connecting layer, and an outer layer. The inner layer and the outer layer are respectively woven from blended yarns consisting of recycled cotton fibers, organic cotton fibers, antistatic yarns, and spandex yarns, and the intermediate connecting layer is woven from low-F hot-melt polyester yarns.

[0106] Specifically, the organic cotton fiber, regenerated cotton fiber and spandex yarn constitute a core-spun yarn, wherein the organic cotton fiber and regenerated cotton fiber are mixed as the outer layer of the core-spun yarn, the spandex yarn serves as the core layer of the core-spun yarn, and there are two polyester antistatic yarns, which are cross-wrapped on the outer periphery of the core-spun yarn composed of regenerated cotton fiber, organic cotton fiber and spandex yarn.

[0107] Specifically, the antistatic yarn accounts for 3% of the weight of the blended yarn, the spandex yarn accounts for 3% of the weight of the blended yarn, the regenerated cotton fiber accounts for 10% of the weight of the blended yarn, and the organic cotton fiber accounts for 84% of the weight of the blended yarn.

[0108] Specifically, the fabric is prepared by the following processing method:

[0109] A. Yarn preparation: Prepare blended yarn and low-F hot-melt polyester yarn, where the blended yarn includes recycled cotton fiber, spandex yarn, antistatic yarn, and organic cotton fiber;

[0110] B. Weaving: Use 24G double-sided weft knitting circular machine to weave blended yarn and low F hot-melt polyester yarn into grey fabric;

[0111] C. Anti-wrinkle finishing of blanks:

[0112] (1) Immersing the blank in a fabric pretreatment solution and rolling it through a rolling mill;

[0113] (2) repeating step (1) several times until the fabric has a liquid carrying rate of 100% after rolling;

[0114] (3) drying the fabric obtained in step (2); the drying temperature is 170° C., and the drying time is 1 minute, thereby obtaining a regenerated cotton air layer knitted fabric.

[0115] Furthermore, the pretreatment solution is a mixture of 10 parts of N-methyldiethanolamine, 20 parts of citric acid, and 70 parts of water.

[0116] Comparative Example 1

[0117] The regenerated cotton knitted fabric obtained by the method described in CN112046122 A comprises the following steps:

[0118] S1: Obtaining recycled cotton fiber: Recycle used clothes and scraps, wash them, sterilize them at high temperature, cut them into pieces with a cloth shredder, and loosen them to obtain recycled cotton fiber;

[0119] S2: Blended yarn process: The regenerated cotton fibers are sequentially subjected to pre-drawing and strip-winding combined machine processing, and then subjected to combing cotton processing to obtain regenerated cotton fiber slivers; the regenerated cotton fiber slivers with a content of 20% are drawn with organic cotton fibers using three-pass drawing, first spun into roving and then spun into yarn, and then twisted through a winding bobbin to produce cotton fiber strands;

[0120] S3: Fabric weaving process: 75D / 36F DTY fiber and the cotton fiber strands obtained in step S2 are reeled and then knitted on a computerized flat knitting machine to obtain a semi-finished fabric;

[0121] S4: thermoplastically folding the TPU polyurethane film to form a plurality of evenly distributed 1.9 mm wide wrinkles, filling the wrinkles with 0.02 mm deep TPU and cooling to form a shaping layer;

[0122] S5: Sewing the shaping layer obtained in step S4 and the semi-finished fabric obtained in step S3 together with a connecting thread, and then gluing them with a glue-setting agent to obtain an air layer;

[0123] S6: The air layer obtained in step S5 is electrically heated to 50°C by a 3D gluing machine. When the temperature is sufficient, the 3D gluing machine applies pressure to drive the relief mold. After 0.1s, the air layer and the relief mold are pressed together. After cooling, the 3D recycled cotton knitted fabric is obtained.

[0124] Test example

[0125] (1) The anti-pilling performance of fabrics is tested according to the international GB / T 480.2-1997;

[0126] (2) The bursting strength is tested according to the international GB / 8878-2001;

[0127] (3) The amount of lint in the residual liquid after washing was observed by washing 20 times;

[0128] (4) Fabric wrinkle resistance test - Wrinkle recovery angle is tested according to GB / T3819-1997, and the fabric wrinkle recovery angle WRA is measured.

[0129] The test data is shown in Table 1 below:

[0130] Table 1

[0131]

[0132]

[0133] As can be seen, compared with Comparative Example 1, the fabrics obtained in Examples 1-8 all showed improved anti-pilling performance, bursting strength, residual lint from washing, and wrinkle recovery angle. Therefore, the fabrics prepared in accordance with the present invention exhibited excellent anti-pilling performance, good elasticity, and good wrinkle resistance. Furthermore, in Example 5, due to the high content of recycled cotton fibers, hairiness increased, strength decreased, and wrinkle resistance decreased, resulting in a small amount of floating lint on the fabric after washing.

[0134] Although the present invention is disclosed as above, the present invention is not limited thereto. Any person skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention should be based on the scope defined by the claims.

Claims

1. A recycled cotton air layer knitted fabric, characterized in that: The invention comprises an inner layer, an intermediate connecting layer and an outer layer, wherein the inner layer and the outer layer are woven from blended yarns composed of at least regenerated cotton fiber and organic cotton fiber, respectively; the intermediate connecting layer is woven from low-F hot-melt polyester yarn, wherein the regenerated cotton fiber accounts for 5-15% of the weight percentage of the blended yarn, and the organic cotton fiber accounts for 85-95% of the weight percentage of the blended yarn; the blended yarn also includes polyester antistatic yarn, and the organic cotton fiber, regenerated cotton fiber and spandex yarn form a core-spun yarn, wherein the organic cotton fiber and regenerated cotton fiber are mixed as the outer covering of the core-spun yarn, and the spandex yarn The core layer of the core-spun yarn comprises two antistatic polyester yarns, which are cross-wrapped around the outer periphery of the core-spun yarn composed of regenerated cotton fiber, organic cotton fiber, and spandex yarn. The blended yarn is prepared by the following steps: recycling and opening - material selection - disinfection - carding - drawing process - roving process - spun yarn process - wrapping process - winding process; wherein the carding is performed using a carding machine, the cylinder speed of the carding machine is 330 r / min, the licker-in speed is 800 r / min, the flat plate linear speed is 81 mm / min, and the doffer speed is 20 r / min. The preparation method of the regenerated cotton air layer knitted fabric comprises the following steps: A. Yarn preparation: prepare blended yarn and low F hot-melt polyester yarn; B. Weaving: Use 24G double-sided weft knitting circular machine to weave blended yarn and low F hot-melt polyester yarn into grey fabric; C. Anti-wrinkle finishing of blanks; The anti-wrinkle finishing of the blank comprises the following steps: (1) Immersing the blank in a fabric pretreatment solution and rolling it through a rolling mill; (2) drying the rolled blank to obtain a regenerated cotton air layer knitted fabric; The pretreatment solution is a mixture of N-methyldiethanolamine, citric acid, and water; the weight ratio of N-methyldiethanolamine, citric acid, and water is 5-15:10-20:70-85; The liquid content of the billet rolled by the rolling mill in step (2) is controlled to be 60-100%.

2. The fabric according to claim 1, characterized in that When the low F hot-melt polyester yarn is subjected to high temperature, the F number will be melted by the heat and become 1F.

3. The fabric according to claim 1 or 2, characterized in that: The minimum cycle weaving structure of this fabric is 3-way. The arrangement of the knitting needles in the weaving structure is ABAB for the upper needle disc and BABA for the lower needle cylinder, where A represents high heel needles and B represents low heel needles. The first way is a tuck tissue, the second way is a loop tissue and the lower needle cylinder is a floating thread tissue, the third way is a floating thread tissue and the lower needle cylinder is a loop tissue. The first way uses low-F hot-melt polyester yarn, and the second and third ways both use blended yarns composed of recycled cotton fiber, organic cotton fiber, polyester antistatic yarn and spandex yarn.

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