Composite fabric for down product, method for manufacturing the same, and down product

Abstract

The application discloses a kind of composite fabric for down product, including knitted fabric layer and isolation layer;Knitted fabric layer is knitted fabric, and knitted fabric is knitted by blending yarn, and blending yarn includes first fiber and second fiber, first fiber is hot-pressed and adhered with isolation layer, and second fiber is not adhered with isolation layer;Isolation layer is waterproof and breathable film.The method for preparing the composite fabric for down product of the application, by making protective film on the surface of the second fiber of knitted fabric, so that it is isolated from hot-melt material when hot-pressing and compounding, so that the second fiber of the prepared composite fabric for down product and the non-adhesion of the isolation layer and the air permeability of the composite knitted fabric are maintained, the first fiber in each needle of blending yarn is point-like hot-pressed and adhered with the isolation layer, the total bonding area is large, and the overall fabric is not hard after bonding.The down product made thereby does not run down, and has good skin friendliness.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of knitted fabric, and particularly relates to a composite fabric for down products and a preparation method of the composite fabric and a down product. BACKGROUND

[0002] Down products are a kind of winter cold-proof articles formed by sewing down or other fillers and fabrics together. With the improvement of people's living standards, people have higher and higher requirements for down products, hoping that the down products are not only warm but also more skin-friendly and comfortable. The down product fabric in the prior art is mostly woven fabric. The woven fabric is dense in texture and not prone to down loss. However, the woven fabric is hard and poor in skin-friendliness. Knitted fabric is high in comfort, soft, breathable, good in close-fitting and skin-friendliness. However, the knitted fabric is composed of loops and loose in structure, and cannot prevent down loss and is prone to down loss, so the knitted fabric cannot be directly used as the fabric of down products.

[0003] In order to solve the problem of down loss of knitted fabric, the prior art adopts the method of lining polyester film in the knitted fabric. In order to fix the polyester film, the polyester film is bonded with the knitted fabric by coating adhesive. However, the fabric obtained by this method is poor in breathability due to the adhesive layer, and it is difficult to fill down, and the fabric is hard and uncomfortable to wear. In the prior art, point-shaped adhesive is also used to overcome the problem of poor breathability, but the point-shaped adhesive is prone to fall off, and the point-shaped adhesive bonding makes the fabric hard in a point shape, which not only affects the appearance but also is poor in skin-friendliness. SUMMARY

[0004] The purpose of the present application is to provide a composite fabric for down products, which is not prone to down loss and good in breathability and skin-friendliness.

[0005] The technical solution of the present application is as follows:

[0006] A composite fabric for down products comprises a knitted fabric layer and a separation layer. The knitted fabric layer is knitted fabric, and the knitted fabric is knitted by blended yarn. The blended yarn comprises first fibers and second fibers. The first fibers are hot-pressed and bonded with the separation layer, and the second fibers are not bonded with the separation layer. The separation layer is a waterproof and breathable film.

[0007] The composite fabric for down products of the present application has good air permeability and skin-friendliness, and the waterproof and air-permeable film has good waterproof and air-permeable properties. The knitted fabric is knitted from yarns of the first fiber and the second fiber, and the adhesion between the knitted fabric and the waterproof and air-permeable film as the separation layer only exists between the first fiber. The second fiber is not adhered to the separation layer, so that the first fiber adhered to the separation layer and the adhesion position thereof on the knitted fabric are not air-permeable, and the rest of the knitted fabric, i.e. the second fiber, the space between the first fiber and the second fiber, the space between the first fibers, and the space between the second fibers, all have good air permeability. The convex and concave undulations formed by the bending of each yarn loop during the knitting of the knitted fabric make the single yarn only locally compressed during the hot-pressing of the knitted fabric and the separation layer, so that the knitted fabric still has good air permeability after hot-pressing. Therefore, the composite fabric for down products of the present application has good air permeability. Furthermore, the waterproof and air-permeable properties of the separation layer adhered to the knitted fabric block the channel for the down to run out, so that the composite fabric for down products of the present application does not run out of down and has waterproof properties. In addition, each first fiber on the knitted fabric is hot-pressed and adhered to the separation layer during the hot-pressing of the knitted fabric and the separation layer, and even the first fibers on each loop are hot-pressed and adhered to the separation layer, so that the multiple-point adhesion formed has a large total adhesion area, a large number of adhesion points, uniform adhesion points, firm combination, and soft skin-friendliness and elasticity.

[0008] Preferably, the waterproof and air-permeable film is a PU waterproof and air-permeable film or a TPU waterproof and air-permeable film.

[0009] The thermoplastic polyurethane elastomer (TPU) and the polyurethane (PU) have high strength, the PU waterproof and air-permeable film and the TPU waterproof and air-permeable film have good waterproof and air-permeable properties due to the microporous structure with a diameter of nanometers or sub-microns, have high strength, elasticity, waterproofness, air permeability, and other characteristics, and are soft in material, so that the composite fabric for down products prepared has good skin-friendliness. The diameter of the micropores of the microporous structure on the waterproof and air-permeable film is preferably 0.1-0.5 μm, and the air permeability is preferably selected in the range of 150-500 mm / S.

[0010] Preferably, the first fiber is a TPU fiber or a TPU coated fiber, the melting point of the TPU on the first fiber is a first melting point, the melting point of the separation layer is a second melting point, and the first melting point is lower than the second melting point.

[0011] The TPU on the first fiber of the composite fabric of the present application has a melting point lower than that of the isolation layer, so when heat pressing is performed, the heat pressing temperature is controlled between the first melting point and the second melting point, at which time the TPU on the first fiber melts and penetrates into the isolation layer to bond together; while the isolation layer always remains solid, so its microporous structure does not change and its microporous air permeability is not damaged, and the isolation layer maintains good waterproof and air permeability.

[0012] Preferably, the first fiber is provided with protrusions made of TPU having the first melting point. The protrusions on the first fiber melt and bond with the isolation layer during heat pressing, increasing the bonding area of the first fiber and the isolation layer, making the combination of the knitted fabric and the isolation layer more firm, while not affecting the air permeability of the knitted fabric.

[0013] Preferably, the protrusions are spherical or filamentous. The spherical protrusions can be made by adding powdered solid raw materials to the liquid TPU coating. The filamentous protrusions can be formed by folding a plurality of fibers into a loop, or by adding filamentous solid raw materials to the liquid TPU coating to be coated, or by weaving TPU short fibers in the yarn. The size of the protrusions should not be too large, and the maximum diameter of the spherical protrusions and the diameter of the filamentous protrusions should not be larger than the diameter of the first fiber. Too large protrusions will affect the skin-friendliness and air permeability of the knitted fabric.

[0014] Preferably, the diameter ratio of the first fiber to the second fiber is 1.0:0.9-1.1, and the first fiber and the second fiber are mixed by twisting or by blending. Too little amount of the first fiber will result in small bonding area of the first fiber and the isolation layer, affecting the firmness of the combination.

[0015] The present application also provides a preparation method of the above-mentioned composite fabric for down products, comprising the following steps:

[0016] Step one, preparing the first fiber and the second fiber

[0017] The core wire is coated with TPU to form the first fiber, or TPU fiber is directly used as the first fiber;

[0018] The natural fiber is prepared as the second fiber, the second fiber is soaked in the slurry, taken out and dried to form a protective film on the surface of the second fiber; wherein the slurry is a starch slurry, and the starch content is 10-30 g / L;

[0019] Step two, spinning the knitted fabric

[0020] The first fiber and the second fiber with the protective film obtained in step one are mixed by twisting or blending to form the knitted fabric.

[0021] Step three, hot-pressing compounding

[0022] The knitted fabric obtained in step two is attached to the waterproof and breathable membrane, and hot-pressed to make the TPU on the first fiber hot-melt and bond with the waterproof and breathable membrane to obtain a compounded fabric.

[0023] Step four, enzymatic membrane removal

[0024] The obtained compounded fabric is soaked in hot water with a temperature of 65-70℃ and a pH value of 5.5-7.5. After the compounded fabric is softened, 5-8 g / L of amylase is added, and the temperature is kept for 20-50 min to remove the protective film on the second fiber by enzymatic hydrolysis. Then, the compounded fabric is taken out, washed and dried to obtain a compounded fabric for down products.

[0025] In step one of the preparation method of the compounded fabric for down products, the second fiber forms a protective film on its surface after being soaked in the starch slurry and dried. After the second fiber with the protective film is blended with the first fiber, the TPU on the first fiber hot-melts and is compounded with the waterproof and breathable membrane in the hot-pressing compounding process in step three. The hot-melted TPU cannot penetrate into the adjacent second fiber due to the blockage of the protective film. Even if a small amount of TPU in the molten state penetrates into the second fiber, it is also adsorbed by the protective film. Therefore, the protective film can protect the second fiber from being penetrated by the TPU in the molten state. In step four, the protective film is decomposed by enzymatic hydrolysis of amylase, and is removed from the surface of the second fiber after washing. The clean second fiber maintains the air permeability and does not adhere to the isolation layer. The air permeability between the first fiber and the second fiber is also restored. Therefore, the compounded knitted fabric prepared by the method of the present application can maintain the hot-pressing adhesion between the first fiber and the isolation layer, and the second fiber does not adhere to the isolation layer, and has good air permeability. At the same time, the compounded waterproof and breathable membrane also effectively blocks the channel of the down, so that the skin-friendly knitted fabric can be used for down products and maintain good air permeability and skin-friendliness.

[0026] Preferably, the core wire in step one is cotton, wool, hemp or silk fiber, the TPU coated on the outer periphery of the first fiber is coated or wound, and the natural fiber is cotton, wool, hemp or silk fiber.

[0027] The coated coating is obtained by introducing the first fiber into the treated molten liquid TPU for dip coating, and then drying to form a TPU coating layer on the outer periphery of the first fiber. Continuous operation can be realized by continuous wire feeding and wire winding. The wound coating is obtained by winding the TPU fiber on the outer periphery of the first fiber to form a TPU fiber layer on the outer periphery thereof. In the hot-pressing compounding process, the TPU coating or TPU fiber layer is melted to realize the adhesion with the isolation layer.

[0028] Preferably, the first fiber outer periphery coated TPU thickness is 1 / 4-1 / 2 of the core wire diameter, and the waterproof and breathable film thickness is 0.02-0.8 mm. Too much and too thick TPU will cause the weight of the composite knitted fabric to increase and the comfort to decrease; too little TPU on the first fiber will affect the adhesion.

[0029] The application also provides a down product using the above-mentioned composite fabric for down products. The down product made of the composite fabric for down products of the application has good skin friendliness, good air permeability, and waterproofness.

[0030] The application has the following advantages:

[0031] The method for preparing the composite fabric for down products of the application isolates the second fiber from the hot melt material generated by the first fiber during hot pressing by making a protective film on the surface of the second fiber of the knitted fabric, thereby keeping the second fiber of the prepared composite fabric for down products from being bonded to the isolation layer and keeping the air permeability of the prepared composite fabric for down products. The first fiber in each needle of the blended yarn is pointwise hot-pressed and bonded to the isolation layer, the total bonding area is large, and the overall fabric is not hard after bonding. The down product made in this way does not shed down and has good skin friendliness. DETAILED DESCRIPTION

[0032] The application will be described in detail below in combination with examples.

[0033] Example 1

[0034] A composite fabric for down products is prepared according to the following steps:

[0035] Step 1: Prepare first fiber and second fiber

[0036] Sheep wool fibers with a diameter of 10 μm are prepared, and a TPU with a melting point of 110℃ is used to coat a TPU layer with a thickness of 5 μm on the outer periphery of the fibers, thereby obtaining the first fiber.

[0037] Sheep wool fibers with a diameter of 20 μm are prepared as the second fiber, the second fiber is soaked in a sizing solution, dried, and a protective film is formed on the surface of the second fiber; wherein the sizing solution is a starch sizing solution with a starch content of 10 g / L.

[0038] Step 2: Spinning knitted fabric

[0039] The first fiber and the second fiber with the protective film obtained in step 1 are twisted and mixed, and are knitted on a single-sided circular knitting machine to obtain a knitted fabric.

[0040] Step 3: Hot pressing

[0041] Prepare a TPU waterproof and breathable membrane, with the parameters: air permeability of 168 mm / s, micro-pore diameter of 0.22 μm, thickness of 0.12 mm, and melting point of 140 °C.

[0042] Paste the knitted fabric obtained in step two with the above-mentioned TPU waterproof and breathable membrane, and then hot-press at 120 °C and 0.35 MPa for 5 minutes to make the TPU on the first fiber hot-melt and composite with the TPU waterproof and breathable membrane, to obtain a composite fabric.

[0043] Step four, enzymatic membrane removal

[0044] Soak the obtained composite fabric in hot water with a temperature of 65-70 °C and a pH value of 7.0. After the composite fabric becomes soft, add amylase at a dosage of 5 g / L, and incubate for 30 min to remove the protective film on the second fiber by enzymatic hydrolysis. Then, take out the fabric, wash it clean, dry it, and obtain a composite fabric for down products.

[0045] Example 2

[0046] Prepare a composite fabric for down products according to the following steps:

[0047] Step one, preparation of first fiber and second fiber

[0048] Prepare TPU feather yarn with a diameter of 20 μm as the first fiber. The core line and the decorative line of the TPU feather yarn are made of the same material, and the melting point of the TPU feather yarn is 110 °C. The free end length of the decorative line is 0.5-1.0 mm.

[0049] Prepare cotton fiber with a diameter of 20 μm as the second fiber. Soak the second fiber in a sizing solution, take it out, and dry it to form a protective film on the surface of the second fiber. The sizing solution is a starch sizing solution, and the starch content is 10 g / L.

[0050] Step two, spinning of knitted fabric

[0051] Twist-mix the first fiber and the second fiber with the protective film obtained in step one, and spin on a single-sided circular knitting machine to obtain a knitted fabric.

[0052] Step three, hot-pressing and composite

[0053] Prepare a TPU waterproof and breathable membrane, with the parameters: air permeability of 168 mm / s, micro-pore diameter of 0.22 μm, thickness of 0.12 mm, and melting point of 140 °C.

[0054] Paste the knitted fabric obtained in step two with the above-mentioned TPU waterproof and breathable membrane, and then hot-press at 120 °C and 0.35 MPa for 5 minutes to make the TPU on the first fiber hot-melt and composite with the TPU waterproof and breathable membrane, to obtain a composite fabric.

[0055] Step four, enzymatic membrane removal

[0056] The obtained knitted fabric is soaked in hot water with a temperature of 65-70℃ and a pH value of 7.0. After the composite fabric becomes soft, starch enzyme is added in an amount of 5 g / L, and the enzyme is allowed to react for 20 min to remove the protective film on the second fiber. Then, the composite fabric is taken out, washed, dried, and a composite fabric for down products is obtained.

[0057] Example 3

[0058] A composite fabric for down products is prepared according to the following steps:

[0059] Step 1: Preparation of the first fiber and the second fiber

[0060] A silk fiber with a diameter of 10 μm is prepared, and a TPU fiber with a diameter of 5 μm and a melting point of 110℃ is used to form a TPU coating layer by winding and coating, thereby obtaining the first fiber.

[0061] A silk fiber with a diameter of 20 μm is prepared as the second fiber. The second fiber is soaked in a slurry, taken out and dried, and a protective film is formed on the surface of the second fiber. The slurry is a starch slurry, and the starch content is 30 g / L.

[0062] Step 2: Spinning of the knitted fabric

[0063] The first fiber and the second fiber with the protective film obtained in step 1 are mixed and spun on a single-sided circular knitting machine to obtain a knitted fabric.

[0064] Step 3: Hot pressing and compounding

[0065] A PU waterproof and breathable film is prepared, and the parameters of the film are as follows: a breathability of 236 mm / S, a pore diameter of 0.35 μm, a thickness of 0.02 mm, and a melting point of 220℃.

[0066] The knitted fabric obtained in step 2 is attached to the TPU waterproof and breathable film, and then hot pressing is performed at 120℃ and 0.35 MPa for 5 min, so that the TPU of the first fiber is melted and compounded with the PU waterproof and breathable film, thereby obtaining a composite fabric.

[0067] Step 4: Enzymatic removal of the film

[0068] The obtained knitted fabric is soaked in hot water with a temperature of 65-70℃ and a pH value of 5.5. After the composite fabric becomes soft, starch enzyme is added in an amount of 8 g / L, and the enzyme is allowed to react for 50 min to remove the protective film on the second fiber. Then, the composite fabric is taken out, washed, dried, and a composite fabric for down products is obtained.

[0069] Example 4

[0070] A composite fabric for down products is prepared according to the following steps:

[0071] Step one, preparing first fiber and second fiber

[0072] Sheep wool fiber with diameter of 10 μm and TPU raw material with melting point of 110℃ are prepared, and TPU powder with same material as the TPU raw material is prepared, with powder particle size of 2 μm-10 μm. The above TPU raw material is melted in a temperature-controlled heating molten pool, and the above sheep wool fiber is passed through the molten pool to coat a TPU layer with thickness of 3 μm-5 μm on the surface of the sheep wool fiber. The position of the sheep wool fiber where the molten TPU is pulled away is sprayed with the above TPU powder, and dried. After drying, a TPU coating layer with spherical protrusions is formed on the surface of the sheep wool fiber, thereby obtaining the first fiber. The interval of the protrusions on the surface of the first fiber is 3 mm-5 mm.

[0073] Silk fiber with diameter of 20 μm is prepared as the second fiber. The second fiber is soaked in a slurry, taken out and dried to form a protective film on the surface of the second fiber. The slurry is a starch slurry, and the starch content is 30 g / L.

[0074] Step two, spinning the knitted fabric

[0075] The first fiber and the second fiber with the protective film obtained in step one are mixed and spun on a single-sided circular knitting machine to obtain a knitted fabric.

[0076] Step three, hot pressing and compounding

[0077] A PU waterproof and breathable film is prepared, with parameters of air permeability of 236 mm / s, micropore diameter of 0.35 μm, thickness of 0.8 mm, and melting point of 220℃.

[0078] The knitted fabric obtained in step two is attached to the above TPU waterproof and breathable film, and then hot pressed at 120℃ and 0.35 MPa for 5 minutes to melt the TPU of the first fiber and compound it with the PU waterproof and breathable film.

[0079] Step four, enzymatic membrane removal

[0080] The obtained knitted fabric is soaked in hot water with temperature of 65-70℃ and pH value of 5.5. After the compound fabric becomes soft, starch enzyme is added in an amount of 8 g / L, and incubated for 50 min to remove the protective film on the second fiber by enzymatic hydrolysis. The fabric is taken out, washed and dried to obtain a compound fabric for down products.

[0081] Comparative example 1

[0082] A compound knitted fabric is prepared according to the following steps:

[0083] Step one, preparing first fiber and second fiber

[0084] The first fiber is prepared in the same way as in example 1.

[0085] The second fiber was prepared and implemented exactly the same as example 1, the only difference is that the second fiber is not immersed in the slurry, no protective film.

[0086] Using the above first fiber and second fiber, the same step two as example 1 is used to spin the knitted fabric, the same step three as example 1 is used to hot-press composite, the same step four as example 1 is used to soak the obtained composite fabric in hot water, the soaking time is the same as example 1, the hot water temperature is 65-70℃, the pH value is 7.0. The amylase is added in an amount of 5g / L, and the temperature is kept for 30min, then it is taken out, washed clean, dried, and a composite knitted fabric is obtained.

[0087] Comparative example 2

[0088] A composite knitted fabric is prepared.

[0089] The only difference between the method of preparing a composite knitted fabric in this comparative example and the example is that the melting point of the TPU layer coated on the periphery of the first fiber and the TPU waterproof and breathable film is the same, both are 110℃.

[0090] Comparative example 3

[0091] A composite knitted fabric is prepared according to the following steps:

[0092] Step one, prepare pure wool knitted fabric

[0093] Prepare a pure wool knitted fabric by twisting two strands of wool fibers with a diameter of 20μm and weaving on a single circular knitting machine.

[0094] Step two,

[0095] Prepare a TPU waterproof and breathable film with the following parameters: air permeability of 168mm / S, pore diameter of 0.22μm, thickness of 0.12mm, and melting point of 140℃.

[0096] The pure wool knitted fabric obtained in step one is attached to the above TPU waterproof and breathable film, and point-shaped TPU hot melt adhesive is arranged between the two, the melting point of the TPU hot melt adhesive is 110℃, the diameter of the point-shaped hot melt adhesive is about 1mm, and the interval between the point-shaped hot melt adhesives is 3-5mm. Then hot-press at 120℃, 0.35MPa for 5 minutes to composite the knitted fabric with the TPU waterproof and breathable film, and obtain a composite knitted fabric.

[0097] Test:

[0098] The down products prepared by the composite fabric of each example and the composite knitted fabric prepared in each comparative example are tested for the following properties:

[0099] 1. Air permeability test

[0100] Take the fabric 20 cm x 20 cm, use the full-automatic air permeability tester, in the temperature of 20 ℃, relative humidity 65% environment for 24 hours, then in the above environment according to GB / T 5453-1997 "determination of air permeability of textile fabric", set the pressure difference is 100Pa test, get the air permeability test results, see table 1.

[0101] 2, peel strength test

[0102] The fabric is cut into 200 mm x 15 mm specification, in the temperature of 23 ℃, relative humidity 50% environment for 24 hours, then in the above environment according to GB / T 8808-1988 "peel test method of soft composite plastic material", the peel strength of the isolation layer is tested, the tensile speed is 300 mm / min, parallel test three times, take the average value, the test results are shown in table 1.

[0103] 3, anti-drilling performance test

[0104] According to GB / T 12705.1-2009 "test method for anti-drilling of textile fabric part 1: friction method", the number of drilling feather is tested, see table 1.

[0105] Table 1

[0106]

[0107] From the above results, it can be seen that:

[0108] The composite fabric for down products prepared by the method has high air permeability, which is not much lower than that of the isolation layer before compounding, and the peel strength of the isolation layer is also large, so the isolation layer is not easy to fall off; in the anti-drilling test, no drilling. This shows that the composite fabric for down products of the application has overcome the defect of easy running of down, and has good air permeability, which can be used as the fabric of down products.

[0109] The composite knitted fabric prepared in comparative example 1 has poor air permeability compared with the composite fabric prepared in the example, and the air permeability of the waterproof and breathable film of the isolation layer before compounding is reduced more; the difference between comparative example 1 and example 1 is that the surface of the second fiber is not formed with a protective film during the preparation of the fabric, and the isolation layer is directly hot-pressed. It can be seen that without the protection of the protective film, the TPU on the first fiber will diffuse into the second fiber during hot pressing, thereby blocking the gas channel between the first fiber and the second fiber, and even making the second fiber not breathable, thereby affecting the air permeability; but because the isolation layer is compounded, the problem of running of the knitted fabric is also solved.

[0110] The knitted composite fabric prepared in Comparative Example 2 has a worse air permeability, and the air permeability of the waterproof and air-permeable film used as the isolation layer decreases more. The difference between Comparative Example 2 and Example 1 is that the melting point of the TPU layer coated on the outer periphery of the first fibers and the TPU waterproof and air-permeable film is the same, both being 110°C. Therefore, during the hot-pressing and bonding process, when the TPU on the first fibers melts, the TPU waterproof and air-permeable film as the isolation layer also melts, so that the micropores on the TPU waterproof and air-permeable film as the isolation layer are partially closed due to melting while the first fibers and the second fibers are bonded, and the TPU waterproof and air-permeable film as the isolation layer is also bonded with the second fibers, resulting in a decrease in the air permeability of the TPU waterproof and air-permeable film, a decrease in the air permeability of the second fibers, and a decrease in the air permeability of the knitted composite fabric prepared. As can be seen from the test results in Table 1, the peeling strength of the isolation layer on the knitted composite fabric prepared in Comparative Example 2 also increases, indicating that the second fibers are bonded with the isolation layer.

[0111] The knitted composite fabric prepared in Comparative Example 3 has a good air permeability, and the air permeability of the waterproof and air-permeable film used as the isolation layer decreases less. The difference between Comparative Example 3 and Example 1 is that the method used in Comparative Example 3 is to bond the knitted fabric and the TPU waterproof and air-permeable film by point-like hot-melt adhesive. In this bonding method, since the total bonding area of the knitted fabric and the TPU waterproof and air-permeable film is small, the bonding has less effect on the air permeability of the composite fabric, and the air permeability is good. The peeling strength of the TPU waterproof and air-permeable film on the knitted composite fabric prepared in Comparative Example 3 is significantly smaller, which is because, compared with the knitted composite fabric for down products prepared by the method of the present application, the total bonding area of the knitted fabric and the TPU waterproof and air-permeable film in Comparative Example 3 is small, the number of bonding points is small, and the bonding is relatively uneven (no bonding at the point where there is no adhesive; while in the knitted composite fabric for down products of the present application, the second fibers on each needle of the yarn are bonded with the TPU waterproof and air-permeable film), and the dislocation distance between the knitted fabric and the TPU waterproof and air-permeable film is larger under the action of external force, resulting in a larger peeling force such as pulling between the adhesive points of the knitted fabric and the TPU waterproof and air-permeable film, and thus the two are easily separated.

[0112] The knitted composite fabric for down products prepared by the present application has a good air permeability because the first fibers of the blended yarn are hot-pressed and bonded with the isolation layer, and the second fibers are not bonded with the isolation layer. At the same time, since the first fibers in each needle of the blended yarn are point-like hot-pressed and bonded with the isolation layer, the total bonding area is large, and the overall fabric does not become hard after bonding. Therefore, the down products prepared by the present application do not shed down, and have good skin-friendliness.

[0113] It should be noted that the above-mentioned technical features of the various embodiments of the present application are combinable with each other unless there is a conflict. The above is some, but not all, of the embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by a person of ordinary skill in the art without creative work fall within the protection scope of the present application.

Claims

1. A composite fabric for down products, characterized in that, The knitted fabric layer is knitted fabric, the knitted fabric is knitted by blended yarn, the blended yarn contains first fiber and second fiber, the first fiber and the second fiber are twisted mixed or blended mixed, the first fiber is hot-pressed and bonded with the isolation layer, the second fiber is not bonded with the isolation layer; the isolation layer is waterproof and breathable film.

2. The composite fabric for a down product according to claim 1, wherein The waterproof and breathable film is PU waterproof and breathable film or TPU waterproof and breathable film.

3. The composite fabric for a down product according to claim 2, wherein The first fiber is TPU fiber or TPU coated fiber; the melting point of TPU on the first fiber is the first melting point, the melting point of the isolation layer is the second melting point, and the first melting point is lower than the second melting point.

4. The composite fabric for a down product according to claim 3, wherein The first fiber is provided with protrusions, and the material of the protrusions is TPU with the first melting point.

5. The composite fabric for a down product according to claim 4, wherein The protrusions are spherical or filamentous.

6. The composite fabric for a down product according to claim 4, wherein The diameter ratio of the first fiber to the second fiber is 1.0:0.9-1.

1.

7. A method of manufacturing a composite fabric for a down product according to any one of claims 1 to 6, characterized in that, The steps include: Step one, preparing first fiber and second fiber The TPU is coated on the outer periphery of the core wire to form the first fiber; or the TPU fiber is directly used as the first fiber; The natural fiber is prepared as the second fiber, the second fiber is soaked in the slurry, taken out and dried, and a protective film is formed on the surface of the second fiber; wherein the slurry is starch slurry, and the starch content is 10-30 g / L; Step two, spinning knitted fabric The first fiber and the second fiber with protective film obtained in step one are twisted mixed or blended mixed, blended, and knitted to form knitted fabric; Step three, hot-pressing and compounding The knitted fabric obtained in step two is attached to the waterproof and breathable film, and hot-pressed to make the TPU on the first fiber hot-melt and bonded with the waterproof and breathable film to obtain the composite fabric; Step four, enzymatic membrane removal The obtained composite fabric is soaked in hot water with a temperature of 65-70 DEG C and a pH value of 5.5-7.5; after the composite fabric is softened, amylase 5-8 g / L is added, and the temperature is kept for 20-50 min to remove the protective film on the second fiber by enzymatic hydrolysis; then the composite fabric is taken out, washed and dried to obtain the composite fabric for down products.

8. The method of claim 7, wherein the method is characterized by, The core wire in step one is cotton, wool, hemp or silk fiber, the TPU coated on the outer periphery of the first fiber is coated or wound; and the natural fiber is cotton, wool, hemp or silk fiber.

9. The method of claim 8, wherein the method is characterized by, The thickness of the TPU coated on the outer periphery of the first fiber is 1 / 4-1 / 2 of the diameter of the core wire, and the thickness of the waterproof and breathable film is 0.02-0.8 mm.

10. A down product, characterized by The composite fabric for down products of any one of claims 1-6 is used.

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