An air layer thermal fabric

Abstract

The present invention provides an air layer thermal insulation fabric, which includes an inner layer, an intermediate layer, and a surface layer. The inner layer and the surface layer are connected together through the intermediate layer. The surface layer is woven from cotton yarn, the intermediate layer is woven from DTY polyester fiber, the inner layer is woven from FDY polyester fiber, and the cross-section of the FDY polyester fiber is a circular hollow cavity structure. In the present invention, the surface layer is woven from cotton yarn, so that the fabric has good moisture absorption and air permeability. At the same time, the cotton yarn can also make the fabric have good thermal insulation performance. In addition, the inner layer is woven from FDY polyester fiber with a circular hollow cavity structure, and the yarn cavities support each other, reducing the flattening coefficient and achieving the hollow thermal insulation effect, further improving the moisture absorption, air permeability and thermal insulation performance of the fabric.

Description

Technical Field

[0001] The present invention relates to the technical field of textiles, and more particularly to an air layer thermal insulation fabric. Background Art

[0002] Currently, common air layer fabrics include cotton, polyester, polyester-cotton, spandex-containing, etc. Due to the fabric structure design of three layers, namely the inner layer, the middle layer and the outer layer, an air interlayer is formed in the fabric, achieving a thermal insulation effect. The air layer fabrics can have a smooth surface on both sides, or a smooth surface and a fleece inner layer. Therefore, air layer fabrics are becoming increasingly popular among consumers at home and abroad.

[0003] An existing air layer fabric with the publication number of CN 208762661 U includes an inner layer, a middle layer and an outer layer. The inner layer and the outer layer are connected together through the middle layer. The outer layer is woven by cationic polyester yarn and spandex, and the inner layer is woven by cationic polyester composite yarn and spandex. Its characteristics are: the middle layer is woven by cationic polyester yarn; the fabric is knitted by a two-track upper needle plate and a two-track lower needle cylinder, with six tracks as a cycle. Among them, the first track is in turn upper needle loop formation, upper needle loop formation, lower needle floating yarn, lower needle floating yarn; the second track is in turn upper needle floating yarn, upper needle floating yarn, lower needle loop formation, lower needle loop formation; the third track is in turn upper needle floating yarn, upper needle tucking, lower needle tucking, lower needle floating yarn; the fourth track is in turn upper needle loop formation, upper needle loop formation, lower needle floating yarn, lower needle floating yarn; the fifth track is in turn upper needle floating yarn, upper needle floating yarn, lower needle loop formation, lower needle loop formation; the sixth track is in turn upper needle loop formation, upper needle floating yarn, lower needle floating yarn, lower needle tucking. In the prior art, both the front and back sides are woven by solid cationic polyester yarn and spandex yarn, and the middle layer is woven by cationic polyester. The fabric not only has poor moisture absorption and air permeability, but also has poor thermal insulation performance. Summary of the Invention

[0004] In view of this, the present invention aims to provide an air layer thermal insulation fabric to solve the problems that in the prior art, both the front and back sides are woven by solid polyester yarn and spandex yarn, resulting in poor moisture absorption and air permeability as well as poor thermal insulation performance of the fabric.

[0005] To achieve the above object, the technical solution of the present invention is as follows

[0006] An air layer thermal insulation fabric includes an inner layer, a middle layer and a surface layer. The inner layer and the surface layer are connected together through the middle layer. The surface layer is woven from cotton yarn, the middle layer is woven from DTY polyester fiber, and the inner layer is woven from FDY polyester fiber. The cross-section of the FDY polyester fiber is a circular hollow cavity structure.

[0007] This setting is obtained by weaving the surface layer with cotton yarn, which makes the fabric have good moisture absorption and breathability. At the same time, the cotton yarn can also make the fabric have good warmth retention. In addition, the inner layer is woven with FDY polyester fiber with a circular hollow cavity structure. The FDY polyester fiber with a circular hollow cavity structure is used for weaving, and the hollow yarn with a hollow structure brings a light texture, and the yarn cavities support each other, reducing the flattening coefficient and achieving the hollow warmth retention effect, further improving the moisture absorption, breathability and warmth retention of the fabric.

[0008] Furthermore, the hollowness of the FDY polyester fiber is 25-40%, and the coefficient of variation CV is 10.0-15.0.

[0009] In this setting, the FDY polyester fiber has good resilience, and the yarn cavities support each other, reducing the flattening coefficient, thus achieving the hollow warmth retention effect. A large amount of static and non-convective air is contained in the fiber cavities. Each fiber contains more air, forming an air protection layer, which can prevent cold air from entering and generate the isolation and warmth retention performance. The hollow fiber is light and soft, and has the unique wicking effect of the fiber, with high diffusivity, which can quickly and naturally discharge the moisture and sweat of the human body, keeping the body dry and warm.

[0010] Furthermore, the fabric is knitted by the upper needle disc with two needle beds and the lower needle cylinder with three needle beds in a cycle of six rows. Among them, in the first row, it is in turn upper needle float, upper needle loop formation, lower needle tuck, lower needle float, lower needle float; in the second row, it is in turn upper needle float, upper needle float, lower needle loop formation, lower needle loop formation, lower needle float; in the third row, it is in turn upper needle tuck, upper needle loop formation, lower needle float, lower needle float, lower needle loop formation; in the fourth row, it is in turn upper needle loop formation, upper needle float, lower needle float, lower needle tuck, lower needle tuck; in the fifth row, it is in turn upper needle float, upper needle float, lower needle loop formation, lower needle loop formation, lower needle float; in the sixth row, it is in turn upper needle loop formation, upper needle tuck, lower needle float, lower needle float, lower needle loop formation.

[0011] This setting forms an air layer structure in the middle layer of the fabric through a unique fabric weaving structure. At the same time, the surface layer is flatter and warmer, and the inner layer is an uneven structure, which is more likely to fluff, so as to increase the warmth retention effect of contacting the human skin. The air layer in the middle layer and the FDY polyester fiber with a hollow cavity in the inner layer cooperate with each other, not only making the fabric have good warmth retention, but also having strong moisture absorption and breathability.

[0012] Furthermore, DTY polyester fiber is used in the first row and the fourth row.

[0013] Furthermore, the fineness of the DTY polyester fiber is 30-75D, and the fineness of the DTY polyester fiber is 34-72F.

[0014] This setting can provide a certain amount of elasticity, making the fabric more flexible and comfortable. At the same time, it allows air to circulate freely within the fabric, thus keeping the body dry and comfortable, and also improving the warmth retention of the fabric.

[0015] Further, the second path and the fifth path adopt cotton yarn.

[0016] Further, the yarn count of the cotton yarn is 20 - 40S.

[0017] This setting can improve the warmth retention of the fabric, while making the fabric more breathable and more flexible, improving the touch.

[0018] Further, the third path and the sixth path adopt FDY polyester fiber.

[0019] Further, the thickness of the FDY polyester fiber is 150 - 320D, and the fineness of the DTY polyester fiber is 90 - 194F.

[0020] This setting can provide a soft and comfortable touch, improving the wearing comfort. At the same time, the FDY polyester fiber has good moisture absorption and breathability, keeping the body dry. Finally, the FDY polyester fiber has good elasticity. When it is woven into the fitting layer, it can closely fit the body, providing a good fitting effect. This fitting helps to keep the body warm and comfortable.

[0021] Further, the gram weight of the warm air layer fabric is 250 - 330g / m 2 .

[0022] This setting can improve the warmth retention performance, durability, comfort and breathability of the fabric.

[0023] Compared with the prior art, the air layer warm fabric of the present invention has the following advantages:

[0024] 1) The present invention is obtained by weaving the surface layer with cotton yarn, making the fabric have good moisture absorption and breathability. At the same time, the cotton yarn can also make the fabric have good warmth retention. In addition, the inner layer is woven with FDY polyester fiber having a circular hollow cavity structure. The FDY polyester fiber has good resilience. The yarn cavities support each other, reducing the coefficient of being flattened, thus achieving the hollow warmth retention effect; a large amount of static and non-convective air is contained in the fiber cavities. Each fiber contains more air, forming an air protection layer, which can prevent cold air from entering and generate an isolation warmth retention performance; the hollow fiber is light and soft, and has a unique wicking effect of the fiber, with high diffusivity, which can quickly and naturally discharge the moisture and sweat of the human body, keeping the body dry and warm;

[0025] 2) The fabric of the present invention has a soft, comfortable and frictionless overall touch. Among them, the heat preservation rate of the air layer heat preservation fabric is ≥ 35%, and the clo value is 0.6 - 1.2. The fabric of the present invention has good heat preservation performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the knitting structure of an air layer heat preservation fabric of the present invention;

[0027] Figure 2 It is a cross-sectional view of the DTY polyester fiber of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0028] In order to make the above objects, features and advantages of the present invention more obvious and understandable, the following detailed description of the specific embodiments of the present invention will be given with reference to the accompanying drawings.

[0029] As Figure 1-2 shown, the present invention provides an air layer heat preservation fabric, which includes an inner layer, a middle layer and a surface layer. The inner layer and the surface layer are connected together through the middle layer. The surface layer is woven from cotton yarn, the middle layer is woven from DTY polyester fiber, and the inner layer is woven from FDY polyester fiber. The cross-section of the FDY polyester fiber is a circular hollow cavity structure.

[0030] The present invention is woven by using cotton yarn for the surface layer, so that the fabric has good moisture absorption and air permeability. At the same time, the cotton yarn can also make the fabric have good heat preservation performance. In addition, the inner layer is woven with FDY polyester fiber having a circular hollow cavity structure. The hollow cavity and the cavity of the air layer support each other, reducing the flattening coefficient and achieving the hollow heat preservation effect, further improving the moisture absorption, air permeability and heat preservation performance of the fabric.

[0031] There are three differences between FDY and DTY in the embodiments of the present application:

[0032] Production process: FDY is fully drawn yarn, and the production process adopts low-speed spinning and high-speed drawing and winding. The two processes are completed on a spinning and drawing combined machine. While DTY is drawn textured yarn, which is the finished yarn after continuous or simultaneous stretching and texturing on one machine.

[0033] Fiber morphology: DTY fibers are curly, while FDY fibers are straight.

[0034] Performance characteristics: The FDY production line has low cost, and the finished product has stable quality, few hairiness breakages and good dyeing uniformity. While the curly fibers of DTY make the fabric soft, fluffy and have good heat preservation performance, and at the same time have wrinkle resistance.

[0035] It should be noted that both the DTY polyester fiber and the FDY polyester fiber in this embodiment belong to existing fibers.

[0036] Specifically, the surface layer cotton yarn accounts for 30-35% in the whole fabric, the middle layer is DTY polyester fiber accounting for 8-12% in the whole fabric, and the inner layer FDY high hollowness polyester fiber accounts for 55-62% in the whole fabric.

[0037] Preferably, the surface layer cotton yarn accounts for 33% in the whole fabric, the middle layer is DTY polyester fiber accounting for 10% in the whole fabric, and the inner layer FDY high hollowness polyester fiber accounts for 57% in the whole fabric.

[0038] Specifically, the hollowness of the FDY polyester fiber is 28-35%, and the coefficient of variation CV is 10.0-12.0.

[0039] Specifically, the fabric is knitted by a two-track upper dial and a three-track lower cylinder with a six-course cycle. Among them, the first course is in sequence: upper needle float stitch, upper needle loop formation, lower needle tuck stitch, lower needle float stitch, lower needle float stitch; the second course is in sequence: upper needle float stitch, upper needle float stitch, lower needle loop formation, lower needle loop formation, lower needle float stitch; the third course is in sequence: upper needle tuck stitch, upper needle loop formation, lower needle float stitch, lower needle float stitch, lower needle loop formation; the fourth course is in sequence: upper needle loop formation, upper needle float stitch, lower needle float stitch, lower needle tuck stitch, lower needle tuck stitch; the fifth course is in sequence: upper needle float stitch, upper needle float stitch, lower needle loop formation, lower needle loop formation, lower needle float stitch; the sixth course is in sequence: upper needle loop formation, upper needle tuck stitch, lower needle float stitch, lower needle float stitch, lower needle loop formation.

[0040] Specifically, the first course and the fourth course adopt DTY polyester fiber.

[0041] Specifically, the thickness of the DTY polyester fiber is 30-75D, and the fineness of the DTY polyester fiber is 34-72F. Preferably, the thickness of the DTY polyester fiber is 50D, and the fineness of the DTY polyester fiber is 48F.

[0042] Specifically, the second course and the fifth course adopt cotton yarn.

[0043] Specifically, the yarn count of the cotton yarn is 20-40S. Preferably, the yarn count of the cotton yarn is 36S.

[0044] Specifically, the third course and the sixth course adopt FDY polyester fiber.

[0045] Specifically, the thickness of the FDY polyester fiber is 150-320D, the fineness of the FDY polyester fiber is 90-194F, the thickness of the FDY polyester fiber is 300D, and the fineness of the FDY polyester fiber is 192F.

[0046] Specifically, the gram weight of the thermal air layer fabric is 250-330 g / m 2 , preferably, the gram weight of the thermal air layer fabric is 325 g / m 2 .

[0047] In this application, suitable yarns, yarn ratios, and knitting structures endow the obtained fabric with permanent thermal insulation performance. The fabric has excellent moisture permeability without chemical treatment, and the overall touch of the fabric is soft, comfortable, and free of friction.

[0048] The present invention provides a method for preparing an air layer thermal insulation fabric, including the above-mentioned air layer thermal insulation fabric, and specifically includes the following steps:

[0049] (1) Weaving process:

[0050] (2) Blank retraction: Immerse the woven fabric in water, operate reciprocally according to the set process, add a raising agent, and then perform dehydration. Set the dehydration conditions as a rotation speed of 600-610 revolutions per minute and a time of 2-3 minutes to dehydrate the fabric;

[0051] The steps of the set process in step (2) include: the ratio of water to fabric is 5:1, heat up to 45°C and keep warm for 8 minutes, add 0.5% penetrant and degreasing agent, heat up to 100°C and keep warm for 20 minutes, after the heat preservation ends, cool down to 70°C, introduce cold water for overflow rinsing for 10 minutes, drain the liquid and then introduce water again, wash at room temperature for 15 minutes, then drain and reintroduce water, add 6 g / L of emulsion, heat up to 45°C and keep warm for 20 minutes, and drain the liquid after the heat preservation ends.

[0052] In this step, the blank fabric is not dyed. First, impurities are removed to allow the fabric to fully retract, and a raising agent is added to ensure that the fabric is more fluffy. At the same time, it can not only improve the dyeing effect but also improve the later raising effect.

[0053] Specifically, the emulsion is an emulsion LHM prepared by compounding a higher fatty acid derivative and an appropriate amount of silicone oil. (3) Pre-setting: The setting temperature is set at 180-195°C, the gram weight after setting is 245-255 g / cm 2 , the width is 170-175 cm, the vehicle speed is 23-35 m / min, and the setting time is 1.9-2.0 min.

[0054] This setting can prevent the FDY polyester fiber with a hollow cavity and the air layer structure from being flattened and deformed, facilitate subsequent dyeing, and improve the three-dimensionality of the fabric.

[0055] (4) Dyeing: Immerse the pre-shaped fabric into a dyeing solution with a disperse dye formulation of 1.5 - 2% dye, 2.1 - 2.8 g / L leveling agent, 1.8 - 2.4 g / L chelating dispersant, 3.5 - 4.5 g / L sodium acetate, 2 - 2.5 g / L anti-wrinkle agent, and HAc (pH 4.5 - 5), and conduct sectional temperature-controlled dyeing. After dyeing, wash and dry; the sectional temperature control is as follows: heat from room temperature to 80°C at a rate of 0.55°C / min, hold for 5 minutes, then continue to heat to 125°C at a rate of 0.75°C / min, hold for 40 - 50 minutes, and cool to 70°C at a rate of 0.75°C / min. (5) Dehydration: After dyeing, dehydrate at a rotation speed of 580 - 620 revolutions per minute for 2 - 3 minutes.

[0056] (6) Drying: Use silicone oil to process and shape the dehydrated fabric, set the shaping temperature at 115 - 145°C, and the vehicle speed at 11 - 23 meters per minute.

[0057] This setting can cause the FDY polyester fiber with a hollow cavity and the air layer structure in dyeing and finishing to deform and return to the original three-dimensional structure, enabling the fabric to maintain the three-dimensional structure and have good warmth retention.

[0058] (7) Raising: Raise the inner layer of the fabric twice, with the speed of the bent needle at 120 - 150 RPM, the speed of the straight needle at 110 - 150 RPM, the fabric speed at 10 - 20 m / min, the speed of the spreading roller at 280 - 320 RPM, the speed of the cleaning roller at 560 - 640 RPM, the speed of the main rotating cylinder at 140 - 160 RPM, and the speed of the fabric output roller at 5 - 10 m / min.

[0059] (8) Combing: The process parameters for combing are as follows: comb the fabric, with the speed of the bent needle at 40 - 60 RPM, the speed of the straight needle at 40 - 60 RPM, the fabric speed at 15 - 30 m / min, the speed of the cleaning roller at 560 - 640 RPM, and the speed of the main rotating cylinder at 140 - 160 RPM.

[0060] (9) Shearing: The process parameters for shearing are as follows: shear the fabric, with the fabric speed at 8 - 10 m / min and the knife speed at 900 - 1000 RPM.

[0061] (10) Re-shaping: Set the shaping temperature at 110 - 150°C.

[0062] Example 1

[0063] The present invention provides a method for preparing an air layer warmth retention fabric, specifically including the following steps:

[0064] (1) Weaving process: The thickness of the DTY polyester fiber used in weaving is 40D, and the fineness of the DTY polyester fiber is 36F. The yarn count of the cotton yarn is 20S. The thickness of the FDY polyester fiber is 280D, and the fineness of the DTY polyester fiber is 192F. The hollowness of the FDY polyester fiber is 28%, and the coefficient of variation CV is 10.0. The surface cotton yarn accounts for 33% in the whole fabric, the middle layer is DTY polyester fiber accounting for 10% in the whole fabric, and the inner layer FDY high-hollowness polyester fiber accounts for 57% in the whole fabric.

[0065] (2) Blank retraction: Immerse the woven fabric in water, run it reciprocally according to the set process, add a raising agent, and then perform dehydration. Set the dehydration conditions as a rotation speed of 600 revolutions per minute and a time of 2 minutes to dehydrate the fabric.

[0066] The steps of the set process in step (2) include: The ratio of water to fabric is 5:1, heat up to 45°C and keep warm for 8 minutes, add 0.5% penetrant and degreasing agent, heat up to 100°C and keep warm for 20 minutes, after the insulation ends, cool down to 70°C, introduce cold water for overflow water washing for 10 minutes, drain the liquid and then introduce water again, wash at room temperature for 15 minutes, then drain and re-introduce water, add an emulsion at 6g / L, heat up to 45°C and keep warm for 20 minutes, and drain the liquid after the insulation ends.

[0067] Specifically, the emulsion uses an emulsion LHM prepared by compounding a higher fatty acid derivative and an appropriate amount of silicone oil.

[0068] In this step, the blank fabric is not dyed. First, impurities are removed to allow the fabric to fully retract. A raising agent is added to ensure that the fabric is more fluffy. At the same time, it can not only improve the dyeing effect but also improve the later raising effect.

[0069] (3) Pre-setting: The setting temperature is set at 180°C, the gram weight after setting is 245g / cm 2 , the width is 170cm, the vehicle speed is 23m / min, and the setting time is 1.9min.

[0070] (4) Dyeing: Immerse the pre-set fabric in a dyeing solution with a disperse dye formula of 1.5% dye, 2.1g / L leveling agent, 1.8g / L chelating dispersant, 3.5g / L sodium acetate, 2g / L anti-wrinkle agent, and HAc (pH 4.5), and perform segmented temperature-controlled dyeing. After dyeing, clean and dry; among them, the segmented temperature control is: heat up from room temperature to 80°C at a rate of 0.55°C / min, keep warm for 5min, then continue to heat up to 125°C at a rate of 0.75°C / min, keep warm for 40 minutes, and cool down to 70°C at a rate of 0.75°C / min.

[0071] (5) Dehydration: After dyeing, dehydrate at a rotation speed of 580 revolutions per minute for 2 minutes;

[0072] (6) Drying: The dehydrated fabric is processed and shaped with silicone oil. Set the shaping temperature at 115°C and the vehicle speed at 11 m / min.

[0073] (7) Raising: Raise the inner layer of the fabric twice. The speed of the bent needle is 120 RPM, the speed of the straight needle is 110 RPM, the fabric speed is 10 m / min, the speed of the fabric spreading roller is 280 RPM, the speed of the cleaning roller is 560 RPM, the speed of the main rotating cylinder is 140 RPM, and the speed of the fabric output roller is 5 m / min.

[0074] (8) Carding: The process parameters of the carding are as follows: Card the fabric. The speed of the bent needle is 40 RPM, the speed of the straight needle is 40 RPM, the fabric speed is 15 m / min, the speed of the cleaning roller is 560 RPM, and the speed of the main rotating cylinder is 140 RPM.

[0075] (9) Shearing: The process parameters of the shearing are as follows: Shear the fabric. The fabric speed is 8 m / min and the knife speed is 900 RPM.

[0076] (10) Re-shaping: Set the shaping temperature at 140°C.

[0077] Specifically, the thickness of the fabric obtained in this embodiment is 320 g / m2.

[0078] Example 2 The present invention provides a method for preparing an air layer thermal insulation fabric, including the above-mentioned air layer thermal insulation fabric, specifically including the following steps:

[0079] (1) Weaving process: The fineness of the DTY polyester fiber used is 50D, the yarn count of the cotton yarn is 30S, and the fineness of the DTY polyester fiber is 36F. The fineness of the FDY polyester fiber is 300D, the fineness of the DTY polyester fiber is 192F, the hollowness of the FDY polyester fiber is 29%, the coefficient of variation CV is 11.0, the proportion of the surface cotton yarn in the whole fabric is 33%, the proportion of the middle layer of DTY polyester fiber in the whole fabric is 10%, and the proportion of the inner layer of FDY high-hollowness polyester fiber in the whole fabric is 57%.

[0080] (2) Blank retraction: Immerse the woven fabric in water, run it reciprocally according to the set process, add a raising agent, and then dehydrate it. Set the dehydration conditions as a rotation speed of 605 revolutions per minute and a time of 3 minutes to dehydrate the fabric;

[0081] The steps of the set process in step (2) include: the ratio of water to fabric is 5:1, heat up to 45°C and keep warm for 8 minutes, add penetrant and degreasing agent with a dosage of 0.5%, heat up to 100°C and keep warm for 20 minutes, after the heat preservation is over, cool down to 70°C, introduce cold water for overflow rinsing for 10 minutes, drain the liquid and then introduce water again, rinse at room temperature for 15 minutes, drain the water again and reintroduce water, add 6 g / L of emulsion, heat up to 45°C and keep warm for 20 minutes, and drain the liquid after the heat preservation is over.

[0082] Specifically, the emulsion is emulsion LHM prepared by compounding a higher fatty acid derivative with an appropriate amount of silicone oil.

[0083] In this step, the blank fabric is not dyed. First, impurities are removed to allow the fabric to fully shrink back, and a raising agent is added to ensure that the fabric is more fluffy. At the same time, it can not only improve the dyeing effect but also improve the later raising effect.

[0084] (3) Pre-setting: The setting temperature is set at 190°C, the gram weight after setting is 250 g / cm 2 , the width is 172 cm, the vehicle speed is 24 m / min, and the setting time is 2.0 min.

[0085] (4) Dyeing: Immerse the pre-set fabric into a dyeing solution with a disperse dye formula of 1.8% dye, 2.4 g / L leveling agent, 2.2 g / L chelating dispersant, 4.0 g / L sodium acetate, 2.2 g / L anti-wrinkle agent, and HAc (pH 5), and carry out segmented temperature-controlled dyeing. After dyeing, clean and dry; the segmented temperature control is as follows: heat up from room temperature to 80°C at a rate of 0.55°C / min, keep warm for 5 min, then continue to heat up to 125°C at a rate of 0.75°C / min, keep warm for 45 minutes, and cool down to 70°C at a rate of 0.75°C / min.

[0086] (5) Dehydration: After dyeing, dehydrate at a rotation speed of 600 revolutions per minute for 2 minutes.

[0087] (6) Drying: Use silicone oil to process and set the dehydrated fabric, set the drying temperature at 120°C, and the vehicle speed at 12 m / min.

[0088] (7) Raising: Raise the inner layer of the fabric 2 times, with the bent needle speed of 130 RPM, the straight needle speed of 130 RPM, the fabric speed of 15 m / min, the spreading roller speed of 300 RPM, the cleaning roller speed of 600 RPM, the main rotating cylinder speed of 150 RPM, and the fabric output roller speed of 8 m / min.

[0089] (8) Combing: The process parameters of the combing are as follows: comb the fabric, with the bent needle speed of 50 RPM, the straight needle speed of 50 RPM, the fabric speed of 22 m / min, the cleaning roller speed of 600 RPM, and the main rotating cylinder speed of 150 RPM.

[0090] (9) Shearing: The process parameters of the shearing are as follows: The fabric is sheared with a fabric speed of 9 m / min and a knife speed of 950 RPM.

[0091] (10) Re-setting: The setting temperature is set at 140 °C.

[0092] The fabric thickness obtained in this example is 325 g / m 2 .

[0093] Example 3

[0094] The present invention provides a method for preparing an air layer thermal insulation fabric, including the above-mentioned air layer thermal insulation fabric, which specifically includes the following steps:

[0095] (1) Weaving process: The fineness of the DTY polyester fiber used is 60D, and the fineness of the DTY polyester fiber is 36F. The yarn count of the cotton yarn is 40S. The fineness of the FDY polyester fiber is 320D, and the fineness of the DTY polyester fiber is 192F. The hollowness of the FDY polyester fiber is 30%, the coefficient of variation CV is 12.0, the surface cotton yarn accounts for 33% in the whole fabric, the middle layer is DTY polyester fiber accounting for 10% in the whole fabric, and the inner layer FDY high hollowness polyester fiber accounts for 57% in the whole fabric.

[0096] (2) Blank retraction: The woven fabric is put into water, run back and forth according to the set process, and a raising agent is added, and then dehydration is carried out. The dehydration conditions are a rotation speed of 610 revolutions per minute and a time of 3 minutes to dehydrate the fabric.

[0097] The steps of the set process in step (2) include: The ratio of water to fabric is 5:1, heated to 45 °C and kept warm for 8 minutes, adding 0.5% penetrant and degreasing agent, heating to 100 °C and keeping warm for 20 minutes, after the heat preservation is over, cooling to 70 °C, adding cold water for overflowing water washing for 10 minutes, draining the liquid and then adding water again, washing with room temperature water for 15 minutes, then draining the water and re-entering water, adding 6 g / L emulsion, heating to 45 °C and keeping warm for 20 minutes, and draining the liquid after the heat preservation is over.

[0098] Specifically, the emulsion is an emulsion LHM prepared by compounding a higher fatty acid derivative and an appropriate amount of silicone oil.

[0099] In this step, the blank fabric is not dyed. First, impurities are removed to make the fabric fully retract, and a raising agent is added to ensure that the fabric is more fluffy, which can not only improve the dyeing effect but also improve the later raising effect.

[0100] (3) Pre-setting: The setting temperature is set at 195 °C, the gram weight after setting is 255 g / cm 2 , the width is 175 cm, the vehicle speed is 25 m / min, and the setting time is 2.0 min.

[0101] (4) Dyeing: Immerse the pre-shaped fabric into a dyeing solution with a disperse dye formulation of 2% dye, 2.8 g / L leveling agent, 2.4 g / L chelating dispersant, 4.5 g / L sodium acetate, 2.5 g / L anti-wrinkle agent, and HAc (pH 5), and conduct stepwise temperature-controlled dyeing. After dyeing, wash and dry; the stepwise temperature control is as follows: heat from room temperature to 80 °C at a rate of 0.55 °C / min, hold for 5 min, then continue heating to 125 °C at a rate of 0.75 °C / min, hold for 50 minutes, and cool to 70 °C at a rate of 0.75 °C / min.

[0102] (5) Dehydration: After dyeing, dehydrate at a speed of 620 revolutions per minute for 3 minutes.

[0103] (6) Drying: Use silicone oil to process and shape the dehydrated fabric, set the shaping temperature at 125 °C, and the vehicle speed at 13 m / min.

[0104] (7) Raising: Raise the inner layer of the fabric 2 times, with the bent needle speed at 150 RPM, the straight needle speed at 150 RPM, the cloth speed at 20 m / min, the spreading roller speed at 320 RPM, the cleaning roller speed at 640 RPM, the main rotating cylinder speed at 160 RPM, and the cloth output roller speed at 10 m / min.

[0105] (8) Combing: The process parameters for combing are as follows: comb the fabric, with the bent needle speed at 60 RPM, the straight needle speed at 60 RPM, the cloth speed at 30 m / min, the cleaning roller speed at 640 RPM, and the main rotating cylinder speed at 160 RPM.

[0106] (9) Shearing: The process parameters for shearing are as follows: shear the fabric, with the cloth speed at 10 m / min and the knife speed at 1000 RPM.

[0107] (10) Re-shaping: Set the shaping temperature at 130 °C.

[0108] The fabric obtained in this example has a thickness of 330 g / m 2 .

[0109] Comparative Example 1

[0110] Performance tests were conducted on the air layer fabric with the publication number CN 208762661 U as shown in Table 1 below.

[0111] Comparative Example 2

[0112] The difference between this comparative example and Example 2 is that the performance test results of the fabric obtained only through the weaving process are as shown in Table 1 below.

[0113] Comparative Example 3

[0114] The difference between this comparative example and Example 2 is that the hollowness of the FDY polyester fiber is 42%, and the performance test results of the obtained fabric are shown in Table 1 below.

[0115] Comparative Example 4

[0116] The difference between this comparative example and Example 2 is that the hollowness of the FDY polyester fiber is 20%, and the performance test results of the obtained fabric are shown in Table 1 below.

[0117] Comparative Example 5

[0118] The difference between this comparative example and Example 2 is that it does not include the dyeing treatment, and the performance test results of the obtained fabric are shown in Table 1 below.

[0119] Comparative Example 6

[0120] The difference between this comparative example and Example 2 is that no greige cloth retraction is performed, and the performance test results of the obtained fabric are shown in Table 1 below.

[0121] Comparative Example 7

[0122] The difference between this comparative example and Example 2 is that in step (3) pre-setting: the setting temperature is 190°C, and in step (6) drying: the setting temperature is 190°C. The performance test results of the obtained fabric are shown in Table 1 below.

[0123] The conventional physical and chemical indexes of the air layer thermal insulation fabric of this example were tested, and the test results are shown in Table 1.

[0124] Table 1

[0125]

[0126]

[0127] According to Examples 1 to 3 and Comparative Examples 1 to 3, it can be seen that in the solution of this application, through the synergistic effect of the yarn, the knitting structure and the specific preparation method of the fabric, the air layer thermal insulation fabric prepared in this application has excellent warmth retention and air permeability.

[0128] 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 protection scope of the present invention should be subject to the scope defined by the claims.

Claims

1. An air layer thermal insulation fabric, comprising an inner layer, a middle layer, and a surface layer. The inner layer and the surface layer are connected together through the middle layer. The surface layer is obtained by weaving cotton yarn, and the middle layer is obtained by weaving DTY polyester fiber. It is characterized in that, The inner layer is woven from FDY polyester fiber, and the cross-section of the FDY polyester fiber is a circular hollow cavity structure; the hollowness of the FDY polyester fiber is 25-40%, and the coefficient of variation CV is 10.0-CV15.0; the fabric is knitted by an upper needle plate with two needle beds and a lower cylinder with three needle beds in a cycle of six rows. Among them, the first row is in turn upper needle float stitch, upper needle loop formation, lower needle tuck stitch, lower needle float stitch, lower needle float stitch, the second row is in turn upper needle float stitch, upper needle float stitch, lower needle loop formation, lower needle loop formation, lower needle float stitch, the third row is in turn upper needle tuck stitch, upper needle loop formation, lower needle float stitch, lower needle float stitch, lower needle loop formation, the fourth row is in turn upper needle loop formation, upper needle float stitch, lower needle float stitch, lower needle tuck stitch, lower needle tuck stitch, the fifth row is in turn upper needle float stitch, upper needle float stitch, lower needle loop formation, lower needle loop formation, lower needle float stitch, the sixth row is in turn upper needle loop formation, upper needle tuck stitch, lower needle float stitch, lower needle float stitch, lower needle loop formation.

2. The air layer thermal insulation fabric according to claim 1, characterized in that, The first row and the fourth row adopt DTY polyester fiber.

3. The air layer thermal insulation fabric according to claim 2, characterized in that, The fineness of the DTY polyester fiber is 30-75D.

4. The air layer thermal insulation fabric according to claim 1, characterized in that, The second row and the fifth row adopt cotton yarn.

5. The air layer thermal insulation fabric according to claim 2, characterized in that, The yarn count of the cotton yarn is 20-40S.

6. The air layer thermal insulation fabric according to claim 1, characterized in that, Among them, the third row and the sixth row adopt FDY polyester fiber.

7. The air layer thermal insulation fabric according to claim 2, wherein The fineness of the FDY polyester fiber is 150-320D.

8. The air layer thermal insulation fabric according to claim 1, characterized in that, The gram weight of the air layer thermal fabric is 250 to 330 g / m 2 .

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