Washable and anti-drilling long-fiber thermal insulation cotton and its manufacturing method

Abstract

The present invention provides a washable, anti-drilling, long-fiber thermal insulation cotton and a manufacturing method thereof, and relates to the technical field of thermal insulation materials. The washable, anti-drilling, long-fiber thermal insulation cotton described in the present invention comprises a long-fiber sheet formed by bonding filament fibers; the filament fibers are bonded to each other by hot-melting at least one of low-melting-point fibers and low-melting-point fiber powder, or the filament fibers are bonded to each other by spraying glue; the filament fibers are arranged to form a linear cotton net or a grid-like cotton net before bonding. The washable, anti-drilling, long-fiber thermal insulation cotton of the present invention has a multi-layer structure, which can effectively improve the comprehensive properties of the washable, anti-drilling, long-fiber thermal insulation cotton, such as thermal insulation, resilience, washability, anti-drilling, and air permeability.

Description

Technical Field

[0001] The invention relates to the field of thermal insulation fillers, in particular to a washable and anti-drilling long-fiber thermal insulation cotton and a manufacturing method thereof. Background Art

[0002] Traditional washable, down-resistant, long-fiber insulation materials primarily include natural plant and animal fibers (such as down, wool, and cotton) and chemically synthesized fibers (such as polyester). Each of these materials has its own advantages and disadvantages. Natural fibers generally offer excellent breathability and warmth retention, but they readily absorb moisture in humid environments, reducing their thermal insulation performance and causing deformation that is difficult to recover. Chemically synthesized fibers, on the other hand, are popular for their affordability and ease of maintenance.

[0003] However, some washable, down-resistant, long-fiber insulation cotton can experience structural damage after washing, especially machine washing, leading to uneven fiber distribution within the filling, which affects both appearance and user experience. Some other washable, down-resistant, long-fiber insulation cottons struggle to regain their original shape and loft even after drying, which not only affects the product's aesthetics but also weakens its original warmth-retaining properties. Summary of the Invention

[0004] The invention provides a washable and anti-drilling long-fiber thermal insulation cotton and a manufacturing method thereof, which are used to solve the problems in the prior art that the washable and anti-drilling long-fiber thermal insulation cotton is easily deformed and has poor recovery after washing.

[0005] The present invention provides a washable and anti-drilling long-fiber thermal insulation cotton, comprising a long-fiber sheet formed by bonding filament fibers;

[0006] The filament fibers are bonded to each other by hot-melting at least one of low-melting-point fiber and low-melting-point fiber powder, or the filament fibers are bonded to each other by spraying glue;

[0007] The filament fibers are arranged to form a linear cotton web or a grid-like cotton web before bonding.

[0008] In some embodiments, the invention further comprises at least one short fiber insulation layer made of short fibers, wherein the short fiber insulation layer is bonded to the long fiber sheet.

[0009] In some embodiments, the filament fiber is one of chemical fiber and natural fiber; the chemical fiber is one or more of lyocell fiber, modal fiber, polyester, nylon, acrylic fiber, polypropylene fiber and spandex; the natural fiber is one or more of sheep wool, cashmere, cotton and silk.

[0010] In some embodiments, the filament fibers are stretched and bonded to form a long fiber sheet. When the filament fibers are polyester, nylon, or polypropylene, the filament fibers are FDY or DTY. Before stretching, the fiber fineness of the filament fibers is 0.8D to 1000D, and the number of single fibers per fiber is 10 to 300F. After stretching, the fiber fineness is 0.1D to 15D, and the number of single fibers per fiber is 10 to 300F.

[0011] When the filament fiber is one or more of lyocell fiber, modal fiber, polyester, nylon, acrylic fiber, and polypropylene fiber, the cross section of the filament fiber is one of circular, cross-shaped, snowflake-shaped, C-shaped, H-shaped, star-shaped, Y-shaped, trefoil-shaped, or figure eight-shaped;

[0012] When the low-melting point fiber is polyester or nylon, the low-melting point fiber is FDY or DTY, the fiber fineness of the low-melting point fiber before stretching is 0.8D~1000D, the number of single fibers per fiber is 10~300F, and the fiber fineness after stretching is 0.1D~15D, and the number of single fibers per fiber is 10~300F.

[0013] In some embodiments, the low-melting point fiber is a low-melting point long fiber, and the low-melting point long fiber is a semi-melting core-sheath composite fiber or a fully-melting low-melting point fiber.

[0014] In some embodiments, when the filament fibers are bonded by low-melting-point fibers, the mass ratio of the filament fibers to the low-melting-point fibers is (1-99):1;

[0015] When the filament fibers are bonded by low-melting-point fiber powder, the mass ratio of the filament fibers to the low-melting-point fiber powder is (49-99):1;

[0016] When the filament fibers are bonded together by the low-melting-point fiber and the low-melting-point fiber powder, the mass ratio of the filament fibers, the low-melting-point fiber and the low-melting-point fiber powder is (25-98): (1-24): 1;

[0017] When the filament fibers are bonded by spraying glue, the mass ratio of the sprayed glue to the filament fibers is (1-5): (95-99).

[0018] In some embodiments, the curl of the filament fiber is 10% to 90%, and the number of curls is 5 to 30 per 25 mm; the curl of the low-melting point fiber is 10% to 90%, and the number of curls is 5 to 30 per 25 mm; the fiber distribution density of the long fiber sheet is 100 to 300,000 fibers / m 2 The weight range of the long fiber sheet is 10~1000g / m 2 The area of ​​a single mesh of the mesh is 0.01~100mm 2 .

[0019] The present invention also provides a method for manufacturing washable and anti-drilling long-fiber thermal insulation cotton, comprising the following steps:

[0020] Arrange the filament fibers and the low-melting-point fibers to form a linear cotton web or a grid-like cotton web;

[0021] The low-melting-point fibers are melted and bonded to the filament fibers through heating and shaping to form long-fiber sheets, thereby obtaining the washable, lint-proof, long-fiber thermal insulation cotton product.

[0022] The present invention also provides a method for manufacturing washable and anti-drilling long-fiber thermal insulation cotton, comprising the following steps: arranging filament fibers and low-melting-point fibers to form a linear cotton net or a grid-shaped cotton net;

[0023] The low-melting-point fibers are melted by heating and setting to bond the filament fibers to form a long-fiber sheet;

[0024] The short fibers are laid out to form a short fiber insulation layer;

[0025] Place the short-fiber insulation layer between two long-fiber sheets;

[0026] After heating, shaping and bonding, the finished product of the washable and anti-drilling long-fiber thermal insulation cotton is obtained.

[0027] In some embodiments, the method for preparing the filament fiber comprises:

[0028] The polyester chips are added to the screw extruder and metered by the spinning pump, so that the polymer fluid is continuously and evenly extruded from the holes of the spinneret or spinneret, and then cooled or solidified to obtain filament fibers;

[0029] The polyester chips are one or more of virgin polyester chips, recycled polyester chips and bio-based polyester chips;

[0030] The regenerated polyester chips are prepared by recycling waste mineral water bottles, clothing scraps or waste clothing.

[0031] Compared with the prior art, the present invention has the following beneficial effects:

[0032] The washable and anti-drilling long-fiber thermal insulation cotton provided by the present invention has a multi-layer composite structure. By stacking layers, air bags can be formed between fibers to lock air and improve the thermal insulation performance of the washable and anti-drilling long-fiber thermal insulation cotton.

[0033] Compared with the traditional thermal insulation cotton which is formed by combing short fibers and arranging them in a disordered manner, this structure is conducive to air circulation, improves the breathability of the thermal insulation cotton, and enhances the comfort of the thermal insulation cotton; in addition, since the filament fibers and low-melting-point fibers are both long-fiber fibers, compared with ordinary short-fiber products, their fibers are longer, and it is not easy for lint to penetrate after the fibers are bonded together, and they have better water-washing and anti-lint performance, which can effectively prevent the thermal insulation cotton from leaking fibers after washing.

[0034] Among them, a short fiber insulation layer is set in the middle of the washable and anti-down long fiber insulation cotton. The fibers in the short fiber insulation layer are arranged in a disordered manner, and the fibers are arranged in a messy manner with many gaps, which can make the insulation cotton more fluffy without affecting the washable and anti-down performance of the insulation cotton.

[0035] The long-fiber sheet material has a grammage range of 10 to 1000 g / m², adapting to different product requirements. A curl of 10 to 90% for the filament and low-melting-point fibers effectively increases the resilience and support of the washable, lint-resistant long-fiber insulation fabric.

[0036] In summary, the washable and down-proof long-fiber thermal insulation cotton of the present invention has good resilience, washability, down-proof properties and high air permeability. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 This is a structural diagram of washable, anti-drilling, long-fiber thermal insulation cotton;

[0038] Figure 2 is a schematic cross-sectional view of a linear cotton web;

[0039] Figure 3 This is the real object of the washable and anti-drilling long-fiber thermal insulation cotton provided by the present invention. Figure 1 ;

[0040] Figure 4 This is the real object of the washable and anti-drilling long-fiber thermal insulation cotton provided by the present invention. Figure 2 ;

[0041] Figure 5 This is a cut-out image of the washable, anti-drilling, long-fiber thermal insulation cotton provided by the present invention;

[0042] Reference numerals:

[0043] 1. Bottom layer; 2. Middle layer; 3. Upper layer; 4. First fiber layer; 5. Second fiber layer; 40. First fiber; 50. Second fiber. DETAILED DESCRIPTION

[0044] To make the objectives, technical solutions, and advantages of the present invention more clear, the technical solutions of the present invention are described clearly and completely below. Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0045] The endpoints of the ranges and any values ​​disclosed herein are not limited to the precise ranges or values, and these ranges or values ​​should be understood to include values ​​close to these ranges or values. For numerical ranges, the endpoints of each range, the endpoints of each range and individual point values, and the individual point values ​​can be combined with each other to obtain one or more new numerical ranges, which should be considered to be specifically disclosed herein.

[0046] In the description of this specification, the reference terms "one embodiment", "some embodiments", "specific implementation methods", or "some specific implementation methods" and the like mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the embodiments of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and features of different embodiments or examples without contradiction.

[0047] It should be noted that, unless otherwise specified, the percentages in the present invention are all by mass.

[0048] like Figure 1-3 As shown, the present invention provides a washable, anti-drilling, long-fiber thermal insulation cotton, comprising a long-fiber sheet formed by bonding filament fibers; the filament fibers are bonded together by hot-melt bonding using at least one of low-melting-point fibers and low-melting-point fiber powder, or the filament fibers are bonded together by spraying glue; the filament fibers are arranged to form a linear cotton net or a grid-like cotton net before bonding. Through bonding, air pockets are formed between the fibers in the cotton net to lock in air and enhance the thermal insulation properties of the washable, anti-drilling, long-fiber thermal insulation cotton. At the same time, the air pockets can also enhance the resilience of the washable, anti-drilling, long-fiber thermal insulation cotton. In addition, because the long-fiber sheet is made of long fibers, its fibers are longer than those of ordinary short-fiber products. After the long fibers are bonded together, the washable, anti-drilling, long-fiber thermal insulation cotton is not easily dredged and has better washable, anti-drilling, and anti-drilling properties. The low-melting-point fiber powder is hot-melt powder.

[0049] In some embodiments, before bonding, the filament fibers and the low-melting-point long fibers are arranged to form a linear cotton web or a grid-like cotton web; then, the adjacent long fibers are bonded by melting the low-melting-point long fibers, or adding low-melting-point fiber powder and then melting the low-melting-point long fibers and low-melting-point fiber powder, or spraying glue.

[0050] In some embodiments, before the filament fibers are bonded, multiple filament fibers are arranged to form a linear cotton web or a grid-like cotton web, and then adjacent filament fibers are bonded by adding and melting low-melting point fiber powder or spraying glue.

[0051] The washable, anti-drilling, long-fiber thermal insulation cotton of the present invention further includes at least one short-fiber thermal insulation layer made of short fibers, the short-fiber thermal insulation layer being bonded to the long-fiber sheet. The short fibers include ordinary short fibers and low-melting-point short fibers in a mass ratio of (8-9):(1-2). The short-fiber thermal insulation layer is heated to melt the low-melting-point short fibers, thereby forming bonding points between the fibers and bonding the short-fiber thermal insulation layer to the long-fiber sheet, thereby achieving a fixed connection between the fibers within the short-fiber thermal insulation layer.

[0052] In some embodiments, the washable and lint-proof long-fiber thermal insulation cotton includes a bottom layer 1, a middle layer 2 and an upper layer 3 connected in sequence from bottom to top, wherein the bottom layer 1 is a first long-fiber sheet formed by bonding a linear cotton net or a grid-like cotton net, the middle layer 2 is a short-fiber thermal insulation layer, and the upper layer 3 is a second long-fiber sheet formed by bonding a linear cotton net or a grid-like cotton net.

[0053] The ordinary staple fibers of the staple insulation layer are preferably at least one of curled hollow staple fibers or curled special-shaped cross-section fibers. The curled hollow staple fibers are used to provide better thermal insulation. At the same time, the hollow cavity also increases the rigidity of the fibers, making them less likely to collapse completely when under pressure, which helps to maintain the fluffiness of the washable and anti-down long-fiber thermal insulation cotton. Curled special-shaped cross-section fibers (such as star-shaped, Y-shaped, trilobal and other special-shaped cross-sections) have fewer contact points when interwoven and are more likely to form an arched structure, thereby supporting a larger space, making the washable and anti-down long-fiber thermal insulation cotton fluffier and having a high compression elasticity. The ordinary staple fibers and low-melting-point staple fibers in the staple insulation layer are arranged in a disordered manner, with a messy arrangement between the fibers and a large number of gaps, which can make the thermal insulation cotton fluffier without affecting the washable and anti-down performance of the thermal insulation cotton.

[0054] In some embodiments, the first long fiber sheet of the bottom layer 1 accounts for 25-35% of the total mass of the washable and anti-down long fiber thermal insulation cotton, the short fiber insulation layer of the middle layer 2 accounts for 30-50% of the total mass of the washable and anti-down long fiber thermal insulation cotton, and the second long fiber sheet of the upper layer 3 accounts for 25-35% of the total mass of the washable and anti-down long fiber thermal insulation cotton.

[0055] In some embodiments, the fibers in the upper layer 3 have a fiber fineness of 0.8-10D, the fibers in the middle layer 2 have a fiber fineness of 2-15D, and the fibers in the bottom layer 1 have a fiber fineness of 0.8D-10D. The finer fibers in the upper layer 3 and bottom layer 1 provide a softer, more delicate touch and better skin-friendliness; the coarser fibers in the middle layer 2 provide better support.

[0056] The filament fibers described in the present invention are not particularly limited. The filament fibers may be chemical fibers or natural fibers. The chemical fibers may be one or more of lyocell fibers, modal fibers, polyester, nylon, acrylic fibers, polypropylene fibers, and spandex. The natural fibers may be one or more of sheep wool, cashmere, cotton, and silk.

[0057] In some embodiments, the filament fibers are stretched and bonded to form a long fiber sheet. When the filament fibers are polyester, nylon, or polypropylene, the filament fibers are FDY or DTY. Before stretching, the fiber fineness of the filament fibers is 0.8D to 1000D, and the number of single fibers per fiber is 10 to 300F. After stretching, the fiber fineness is 0.1D to 15D, and the number of single fibers per fiber is 10 to 300F.

[0058] When the filament fiber is one or more of lyocell fiber, modal fiber, polyester, nylon, acrylic fiber, and polypropylene fiber, the cross-section of the filament fiber is one of circular, cross-shaped, snowflake-shaped, C-shaped, H-shaped, star-shaped, Y-shaped, trifoliate, or figure eight-shaped. By changing the geometric shape of the fiber, the thermal insulation performance of the thermal insulation cotton can be effectively improved without changing the material. Among them, compared with traditional circular cross-section fibers, special-shaped cross-section fibers can form more static air areas inside them, thereby enhancing the thermal insulation effect; at the same time, the special-shaped cross-section can also improve the cohesion and fluffiness between the fibers, so that the thermal insulation cotton has a higher volume density and better thermal resistance performance at the same gram weight. In addition, some special-shaped fibers also have good moisture absorption and perspiration removal, moisture conduction and quick drying, and resistance to compression deformation, which can further improve the comfort and thermal insulation of the thermal insulation cotton in humid environments.

[0059] The low melting point fiber of the present invention is not particularly limited and can be polyolefin fiber, polyamide fiber or polyester fiber.

[0060] When the low-melting-point fiber is polyester or nylon, the low-melting-point fiber is FDY or DTY, the fiber fineness of the low-melting-point fiber before stretching is 0.8D~1000D, the number of single fibers per fiber is 10~300F, and the fiber fineness after stretching is 0.1D~15D, the number of single fibers per fiber is 10~300F;

[0061] In some embodiments, the low-melting point fiber is a low-melting point long fiber, and the low-melting point long fiber can be a semi-melting core-sheath composite fiber or a fully-melting low-melting point fiber.

[0062] When the low-melting-point fiber is a semi-melting sheath-core composite fiber, the sheath of the low-melting-point fiber is a low-melting-point long fiber, and the core is a conventional long fiber. The melting points of the filament fibers and the low-melting-point fiber core are higher than the melting point of the low-melting-point long fiber sheath. This structure allows the core layer to maintain its original physical properties when the sheath melts due to heat. When the sheath melts, the low-melting-point long fiber can be used to bond adjacent fibers in a long fiber sheet or a short fiber insulation layer, or to connect adjacent layers. This improves the overall strength and structural stability of the washable, anti-drilling, long-fiber insulation cotton, allowing it to maintain its original shape after repeated use or washing.

[0063] In some embodiments, the core layer is a hollow long fiber, and the core layer with a hollow structure can maintain good thermal insulation after the low-melting-point long fiber of the skin layer is melted.

[0064] In some embodiments, the low-melting point fiber is a fully meltable low-melting point fiber, such as polyester low-melting point fiber and nylon low-melting point fiber, which is used to bond adjacent fibers in a long-fiber sheet or a short-fiber insulation layer, and can also be used to connect adjacent layers.

[0065] In some embodiments, the filament fibers are crimped fibers.

[0066] In some embodiments, the filament fiber includes 70% to 80% siliconized curled hollow long fibers and 20% to 30% silicon-free curled hollow long fibers. The siliconization treatment can significantly improve the elastic recovery ability of the fiber, and also help reduce heat conduction, thereby further improving the thermal insulation performance. It can also improve the wrinkle resistance of the fiber, making it more washable. The hollow ratio of the siliconized curled hollow long fibers is preferably 20% to 45%, and the hollow ratio of the silicon-free curled hollow long fibers is preferably 15% to 35%. The siliconization treatment can significantly improve the elastic recovery ability, wrinkle resistance and washability of the fiber, and effectively reduce heat conduction and enhance the thermal insulation effect. By adjusting the ratio of siliconized and silicon-free fibers and their respective hollow ratios, the overall thermal insulation performance of the washable and anti-drilling long fiber thermal insulation cotton can be further optimized under the premise of controlling costs.

[0067] In some embodiments, when the filament fibers are bonded by low-melting-point fibers, the mass ratio of the filament fibers to the low-melting-point fibers is (1-99):1;

[0068] In some embodiments, when the filament fibers are bonded by low-melting-point fiber powder, the mass ratio of the filament fibers to the low-melting-point fiber powder is (49-99):1;

[0069] In some embodiments, when the filament fibers are bonded together by low-melting-point fibers and low-melting-point fiber powder, the mass ratio of the filament fibers, low-melting-point fibers, and low-melting-point fiber powder is (25-98): (1-24): 1;

[0070] In some embodiments, when the filament fibers are bonded by spraying glue, the mass ratio of the sprayed glue to the filament fibers is (1-5): (95-99).

[0071] In some embodiments, the curl of the filament fiber and the low-melting-point fiber is 10% to 90%, and the number of curls is 5 to 30 per 25 mm; the fiber distribution density of the long fiber sheet is 100 to 300,000 fibers per m 2 , weight range is 10~1000g / m 2 . The higher the curl, the better the resilience and support performance of the washable and anti-drilling long-fiber thermal insulation cotton. When the curl number is low, it helps to reduce the entanglement between fibers, reduce hardness, and is suitable for skin-friendly materials; when the curl number is high, it can increase the bonding force between fibers and improve wear resistance. The greater the fiber distribution density, the tighter the arrangement between fibers, thereby effectively improving the washable and anti-drilling performance of the washable and anti-drilling long-fiber thermal insulation cotton. The higher the gram weight of the long-fiber sheet, the greater its wear resistance. In actual applications, the appropriate curl, curl number, fiber distribution density and gram weight can be selected according to specific needs to achieve the best washable and anti-drilling performance, resilience and wearing comfort.

[0072] The curl of the filament fibers and low-melting-point fibers is preferably between 30% and 70%. Within this range, the fibers exhibit both good bulk and resilience, contributing to improved product comfort and durability. Furthermore, the interfiber spacing is adequate, resulting in excellent thermal insulation. When the curl is below 10%, the cotton mesh lacks bulk, suffers from poor elasticity, and is easily deformed, failing to provide effective support. When the curl is above 90%, the fibers entangle and form closed pores, hindering air circulation, resulting in poor air permeability and increased heat retention.

[0073] In some embodiments, the area of ​​a single grid of the mesh-shaped cotton net is 0.01-100 mm 2 .

[0074] The linear cotton web is a multi-layer structure consisting of multiple fiber layers, with two adjacent fiber layers arranged in parallel and staggered. In practical applications, the number of fiber layers in the linear cotton web can be adjusted according to actual needs, such as Figure 2As shown, the linear cotton web includes at least a first fiber layer 4 and a second fiber layer 5. The fibers in the first fiber layer 4 are first fibers 40, and the first fiber layer 4 is composed of a plurality of first fibers 40 arranged side by side. The fibers in the second fiber layer 5 are second fibers 50, and the second fiber layer 5 is composed of a plurality of second fibers 50 arranged side by side. The first fibers 40 and the second fibers 50 are staggered. Specifically, a second fiber 50 parallel to the first fibers 40 is provided between two adjacent first fibers 40 in the first fiber layer 4, so that the first fibers 40 and the second fibers 50 form a parallel and staggered arrangement.

[0075] The present invention also provides a method for manufacturing the above-mentioned washable and anti-drilling long-fiber thermal insulation cotton, comprising the following steps:

[0076] The filament fibers are arranged to form a linear or grid-like cotton mesh. The filament fibers in the cotton mesh are bonded together to form a long-fiber sheet, thereby obtaining the washable, lint-resistant, long-fiber thermal insulation cotton product. Specifically, the washable, lint-resistant, long-fiber thermal insulation cotton product can be obtained by adding low-melting-point fiber powder to the surface of the cotton mesh and heating and shaping the low-melting-point fiber powder to melt the low-melting-point fiber powder and bond the filament fibers to form a long-fiber sheet. The mass ratio of the filament fibers to the low-melting-point fiber powder is (49-99):1.

[0077] Alternatively, glue may be sprayed on the surface of the cotton mesh to bond the filament fibers therein to form a long-fiber sheet, thereby obtaining the washable, lint-resistant, long-fiber thermal insulation cotton product. The mass ratio of the glue to the filament fibers during the spraying process is (1-5):(95-99).

[0078] In some embodiments, the filament fibers and low-melting-point fibers are arranged to form a linear cotton web or a grid-like cotton web. The filament fibers and low-melting-point fibers in the cotton web are bonded together to form a long-fiber sheet, thereby obtaining the washable, lint-resistant, long-fiber thermal insulation cotton product.

[0079] Specifically, the cotton web is heated and shaped to melt the low-melting-point fibers and bond them to the filament fibers, forming a long-fiber sheet. This produces a washable, lint-resistant, long-fiber thermal insulation cotton product. The mass ratio of the filament fibers to the low-melting-point fibers is (1-99):1.

[0080] Alternatively, low-melting-point fiber powder may be added to the surface of the cotton web, and then heated and shaped to melt the low-melting-point fiber powder and bond it to the filament fibers to form a long-fiber sheet, thereby obtaining the washable, lint-resistant, long-fiber thermal insulation cotton product. The mass ratio of the filament fibers, low-melting-point fibers, and low-melting-point fiber powder is (25-98):(1-24):1.

[0081] Preferably, the cotton mesh is shaped in three steps, namely, oven heat setting, hot rolling setting, and cold air setting. The oven heat setting temperature is 110-170°C, the hot rolling setting temperature is 70-110°C, and the cold air setting cold air speed is 5-15m / s. Specifically, the cotton mesh is first heated at 110-170°C to melt the low-melting-point fibers in the cotton mesh so as to bond the filament fibers together and achieve preliminary solidification, which is the first setting; then the material thickness is precisely controlled through a hot rolling process to further improve its structural stability and integrity, which is the second setting; finally, cold air cooling is used to fix the product shape and enhance dimensional stability, completing the final third setting.

[0082] After three shaping processes, the washable and anti-drilling long-fiber thermal insulation cotton has a stable structure, good washability and resilience, a soft and comfortable hand feel, and excellent washable and anti-drilling performance, meeting the requirements of high-quality thermal insulation materials.

[0083] In some embodiments, the washable and anti-drilling long-fiber thermal insulation cotton is rolled up and cut and then packaged after completing the shaping process, which is convenient for later transportation and storage.

[0084] In some embodiments, the filament fibers and low-melting-point fibers are stretched and curled before being arranged into a web. Specifically, the filament fibers and low-melting-point fibers are stretched from 0.8D to 1000D to 0.1D to 15D. After curling, the filament fibers and low-melting-point fibers have a curl degree of 10% to 90%, with 5 to 30 curls per 25 mm.

[0085] In some embodiments, the low-melting point fiber is a low-melting point long fiber, and the low-melting point long fiber is a semi-melting core-sheath composite fiber or a fully-melting low-melting point fiber.

[0086] In some embodiments, polyester chips are added to a screw extruder and metered by a spinning pump, so that the polymer fluid is continuously and evenly extruded from the holes of a spinneret or a spinneret, and then cooled or solidified to obtain filament fibers;

[0087] In some embodiments, the polyester chips are one or more of virgin polyester chips, recycled polyester chips, and bio-based polyester chips.

[0088] In some embodiments, the recycled polyester chips are produced by recycling waste mineral water bottles, clothing scraps or waste clothing.

[0089] The present invention further provides a method for manufacturing the washable, anti-drilling, long-fiber thermal insulation cotton, comprising the following steps:

[0090] The filament fibers are arranged to form a linear cotton web or a grid-like cotton web, and the filament fibers in the cotton web are bonded to form a first long-fiber sheet and a second long-fiber sheet in sequence.

[0091] Specifically, a first long-fiber sheet and a second long-fiber sheet can be formed sequentially by adding low-melting-point fiber powder to the surface of a cotton web and then heating and shaping the low-melting-point fiber powder to melt and bond the filament fibers. The mass ratio of the filament fibers to the low-melting-point fiber powder is (49-99):1.

[0092] Alternatively, glue may be sprayed on the surface of the cotton web to bond the filament fibers in the cotton web, thereby forming a first filament sheet and a second filament sheet in sequence. The mass ratio of the glue sprayed to the filament fibers is (1-5):(95-99).

[0093] In some embodiments, the filament fibers and the low-melting point fibers are arranged to form a linear cotton web or a grid-like cotton web, and the filament fibers and the low-melting point fibers in the cotton web are bonded together to sequentially form a first long-fiber sheet and a second long-fiber sheet.

[0094] Specifically, the cotton web is heated and shaped to melt the low-melting-point fibers and bond them to the filament fibers, thereby sequentially forming a first long-fiber sheet and a second long-fiber sheet. The mass ratio of the filament fibers to the low-melting-point fibers is (1-99):1.

[0095] Alternatively, low-melting-point fiber powder may be added to the surface of the cotton web, and then heated and shaped to melt the low-melting-point fiber powder and bond the filament fibers, thereby sequentially forming a first long-fiber sheet and a second long-fiber sheet. The mass ratio of the filament fibers, low-melting-point fibers, and low-melting-point fiber powder is (25-98):(1-24):1.

[0096] In some embodiments, the filament fibers and low-melting-point fibers are stretched and curled before being arranged into a web. Specifically, the filament fibers and low-melting-point fibers are stretched from 0.8D to 1000D to 0.1D to 15D. After curling, the filament fibers and low-melting-point fibers have a curl degree of 10% to 90%, with 5 to 30 curls per 25 mm.

[0097] In some embodiments, the low-melting point fiber is a low-melting point long fiber, and the low-melting point long fiber is a semi-melting core-sheath composite fiber or a fully-melting low-melting point fiber.

[0098] In some embodiments, the short fibers are mixed, opened, carded, and laid to form a short fiber insulation layer; the short fibers include ordinary short fibers and low-melting-point short fibers in a mass ratio of (8-9): (1-2).

[0099] Then, a short fiber insulation layer is placed between the first long fiber sheet and the second long fiber sheet to form a washable and anti-drilling long fiber insulation cotton embryo;

[0100] Finally, the short-fiber thermal insulation layer is bonded to the two long-fiber sheets to obtain the finished product of the washable and anti-drilling long-fiber thermal insulation cotton.

[0101] In some embodiments, the low-melting-point fibers are melted by heating and setting to bond the short-fiber insulation layer and the two long-fiber sheets to obtain the finished product of the washable and anti-drilling long-fiber insulation cotton.

[0102] Preferably, the washable, lint-proof, long-fiber, heat-insulating cotton germ is shaped in three steps, namely, oven heat setting, hot rolling setting, and cold air setting. The oven heat setting temperature is 110-170°C, the hot rolling setting temperature is 70-110°C, and the cold air setting speed is 5-15 m / s.

[0103] Specifically, the washable and anti-drilling long-fiber thermal insulation cotton germ is first heated at a temperature of 110-170°C, and the melted low-melting-point fiber bonds the short-fiber insulation layer to the two long-fiber sheets, thereby achieving the initial solidification of the washable and anti-drilling long-fiber thermal insulation cotton, which is the first shaping; then the material thickness is precisely controlled through a hot rolling process to further improve its structural stability and integrity, which serves as the second shaping; finally, cold air cooling is used to fix the product shape, enhance dimensional stability, and complete the final third shaping.

[0104] After three shaping processes, the washable and anti-drilling long-fiber thermal insulation cotton has a stable structure, good washability and resilience, a soft and comfortable hand feel, and excellent washable and anti-drilling performance, meeting the requirements of high-quality thermal insulation materials.

[0105] In some embodiments, after spraying glue on the first long-fiber sheet, a short-fiber insulation layer is laid, and then after spraying glue on the surface of the short-fiber insulation layer, a second long-fiber sheet is laid, so that the short-fiber insulation layer is bonded to the two long-fiber sheets to obtain the washable and anti-drilling long-fiber insulation cotton finished product.

[0106] In some embodiments, low-melting-point fiber powder is added to the first long-fiber sheet, and then a short-fiber insulation layer is laid. Then, low-melting-point fiber powder is added to the surface of the short-fiber insulation layer, and then a second long-fiber sheet is laid, so that the short-fiber insulation layer is bonded to the two long-fiber sheets to obtain the washable and anti-drilling long-fiber insulation cotton finished product.

[0107] In some embodiments, the washable and anti-drilling long-fiber thermal insulation cotton is rolled up and cut and then packaged after completing the shaping process, which is convenient for later transportation and storage.

[0108] In some embodiments, polyester chips are added to a screw extruder and metered by a spinning pump, so that the polymer fluid is continuously and evenly extruded from the holes of a spinneret or a spinneret, and then cooled or solidified to obtain filament fibers;

[0109] In some embodiments, the polyester chips are one or more of virgin polyester chips, recycled polyester chips, and bio-based polyester chips.

[0110] In some embodiments, the recycled polyester chips are produced by recycling waste mineral water bottles, clothing scraps or waste clothing.

[0111] In order to facilitate understanding of the washable and anti-drilling long-fiber thermal insulation cotton and its manufacturing method provided by the present invention, some specific embodiments are used to illustrate it below.

[0112] In the following examples, the filament fibers are prepared by adding polyester chips to a screw extruder and metering them through a spinning pump, so that the polymer fluid is continuously and evenly extruded from the holes of a spinneret or spinneret, and then cooled or solidified to obtain filament fibers.

[0113] In the following embodiments, the fiber fineness of the filament fiber is 2D; the fiber fineness of the low-melting-point polyester long fiber is 2D; the fiber fineness of the ordinary polyester staple fiber and the low-melting-point polyester staple fiber is 5D, and the ordinary polyester staple fiber is a curled hollow staple fiber.

[0114] Example 1

[0115] This embodiment provides a washable, lint-proof long-fiber thermal insulation cotton, comprising a long-fiber sheet formed by bonding filament fibers and low-melting-point fibers in a mass ratio of 9:1, wherein the filament fibers are polyester fibers, and the low-melting-point fibers are low-melting-point polyester long fibers.

[0116] This embodiment also provides a method for preparing the above-mentioned washable, anti-drilling, long-fiber thermal insulation cotton, which comprises the following steps:

[0117] The filament fibers and low-melting-point polyester long fibers with a mass ratio of 9:1 are arranged to form a linear cotton web.

[0118] The cotton mesh is sequentially shaped through three steps of oven heat setting, hot rolling setting and cold air setting to form a long-fiber sheet, thereby obtaining the washable and anti-drilling long-fiber thermal insulation cotton product.

[0119] The oven heat setting temperature is 130° C., the hot rolling setting temperature is 90° C., and the cold air setting cold air speed is 10 m / s.

[0120] Example 2

[0121] This embodiment provides a washable and lint-proof long-fiber thermal insulation cotton, including a long-fiber sheet formed by bonding filament fibers and low-melting-point fibers in a mass ratio of 17:3, wherein the filament fibers are polyester fibers, and the low-melting-point fibers are low-melting-point polyester long fibers.

[0122] This embodiment also provides a method for preparing the above-mentioned washable, anti-drilling, long-fiber thermal insulation cotton, which comprises the following steps:

[0123] The filament fibers and low-melting-point polyester long fibers are arranged in a mass ratio of 17:3 to form a linear cotton web.

[0124] The cotton mesh is sequentially shaped through three steps of oven heat setting, hot rolling setting and cold air setting to form a long-fiber sheet, thereby obtaining the washable and anti-drilling long-fiber thermal insulation cotton product.

[0125] The oven heat setting temperature is 130° C., the hot rolling setting temperature is 90° C., and the cold air setting cold air speed is 10 m / s.

[0126] Example 3

[0127] This embodiment provides a washable, lint-proof long-fiber thermal insulation cotton, comprising a long-fiber sheet formed by bonding filament fibers and low-melting-point fibers in a mass ratio of 1:1, wherein the filament fibers are polyester fibers, and the low-melting-point fibers are low-melting-point polyester long fibers.

[0128] This embodiment also provides a method for preparing the above-mentioned washable, anti-drilling, long-fiber thermal insulation cotton, which comprises the following steps:

[0129] The filament fibers and low-melting-point polyester long fibers are arranged in a mass ratio of 1:1 to form a linear cotton web.

[0130] The cotton mesh is sequentially shaped through three steps of oven heat setting, hot rolling setting and cold air setting to form a long-fiber sheet, thereby obtaining the washable and anti-drilling long-fiber thermal insulation cotton product.

[0131] The oven heat setting temperature is 130° C., the hot rolling setting temperature is 90° C., and the cold air setting cold air speed is 10 m / s.

[0132] Example 4

[0133] like Figure 1 As shown, this embodiment provides a washable, lint-proof long-fiber thermal insulation cotton, comprising a bottom layer 1, a middle layer 2 and an upper layer 3 connected in sequence from bottom to top, wherein the bottom layer 1 is a first long-fiber sheet formed by gluing a mesh-like cotton net, the middle layer 2 is a short-fiber thermal insulation layer, and the upper layer 3 is a second long-fiber sheet formed by gluing a mesh-like cotton net.

[0134] The first long-fiber sheet and the second long-fiber sheet are formed by bonding filament fibers and low-melting-point fibers in a mass ratio of 9:1. The filament fibers are polyester fibers, and the low-melting-point fibers are low-melting-point polyester long fibers.

[0135] The bottom layer 1 accounts for 25% of the total mass of the washable, down-proof, long-fiber thermal insulation cotton, the middle layer 2 accounts for 50% of the total mass of the washable, down-proof, long-fiber thermal insulation cotton, and the upper layer 3 accounts for 25% of the total mass of the washable, down-proof, long-fiber thermal insulation cotton. The fiber fineness of the upper layer 3 is 2D, the fiber fineness of the middle layer 2 is 5D, and the fiber fineness of the bottom layer 1 is 2D.

[0136] The staple fiber insulation layer comprises common polyester staple fibers and low-melting-point polyester staple fibers in a mass ratio of 4:1.

[0137] This embodiment also provides a method for preparing the above-mentioned washable, anti-drilling, long-fiber thermal insulation cotton, which comprises the following steps:

[0138] Arranging filament fibers and low-melting-point polyester long fibers in a mass ratio of 9:1 to form a mesh-like cotton net, and heat-setting the mesh to form a first long-fiber sheet;

[0139] Arranging filament fibers and low-melting-point polyester long fibers in a mass ratio of 9:1 to form a mesh-like cotton net, and heat-setting to form a second long-fiber sheet;

[0140] Ordinary polyester staple fibers and low-melting-point polyester staple fibers with a mass ratio of 4:1 are mixed, opened, carded, and laid to form a staple fiber insulation layer;

[0141] The short fiber insulation layer is placed between two long fiber sheets to form a washable and anti-drilling long fiber insulation cotton embryo;

[0142] The washable, lint-proof, long-fiber, thermal-insulating cotton germ is shaped in three steps, namely, oven heat setting, hot rolling setting, and cold air setting. The oven heat setting temperature is 130°C, the hot rolling setting temperature is 90°C, and the cold air setting speed is 10 m / s, thereby obtaining the finished product of the washable, lint-proof, long-fiber, thermal-insulating cotton germ.

[0143] Example 5

[0144] The present embodiment provides a washable, lint-proof long-fiber thermal insulation cotton, comprising a bottom layer 1, a middle layer 2 and an upper layer 3 connected in sequence from bottom to top, wherein the bottom layer 1 is a first long-fiber sheet formed by gluing a mesh-like cotton net, the middle layer 2 is a short-fiber thermal insulation layer, and the upper layer 3 is a second long-fiber sheet formed by gluing a mesh-like cotton net.

[0145] The first long-fiber sheet and the second long-fiber sheet are formed by bonding filament fibers and low-melting-point fibers in a mass ratio of 9:1. The filament fibers are polyester fibers, and the low-melting-point fibers are low-melting-point polyester long fibers.

[0146] The bottom layer 1 accounts for 30% of the total mass of the washable, anti-drilling, long-fiber thermal insulation cotton, the middle layer 2 accounts for 40% of the total mass of the washable, anti-drilling, long-fiber thermal insulation cotton, and the upper layer 3 accounts for 30% of the total mass of the washable, anti-drilling, long-fiber thermal insulation cotton. The fiber fineness of the upper layer 3 is 2D, the fiber fineness of the middle layer 2 is 5D, and the fiber fineness of the bottom layer 1 is 2D.

[0147] The staple fiber insulation layer comprises common polyester staple fibers and low-melting-point polyester staple fibers in a mass ratio of 4:1.

[0148] The preparation method is the same as that of Example 4.

[0149] Example 6

[0150] This embodiment provides a washable, lint-proof long-fiber thermal insulation cotton, comprising a long-fiber sheet formed by bonding filament fibers and low-melting-point fibers in a mass ratio of 17:3, wherein the filament fibers are nylon fibers, and the low-melting-point fibers are low-melting-point polyester long fibers.

[0151] This embodiment also provides a method for preparing the above-mentioned washable, anti-drilling, long-fiber thermal insulation cotton, which comprises the following steps:

[0152] The filament fibers and low-melting-point polyester long fibers are arranged in a mass ratio of 17:3 to form a linear cotton web.

[0153] The cotton mesh is sequentially shaped through three steps of oven heat setting, hot rolling setting and cold air setting to form a long-fiber sheet, thereby obtaining the washable and anti-drilling long-fiber thermal insulation cotton product.

[0154] The oven heat setting temperature is 130° C., the hot rolling setting temperature is 90° C., and the cold air setting cold air speed is 10 m / s.

[0155] Example 7

[0156] This embodiment provides a washable, lint-proof long-fiber thermal insulation cotton, comprising a long-fiber sheet formed by bonding filament fibers and low-melting-point fibers in a mass ratio of 17:3, wherein the filament fibers are polypropylene fibers, and the low-melting-point fibers are low-melting-point polyester long fibers.

[0157] This embodiment also provides a method for preparing the above-mentioned washable, anti-drilling, long-fiber thermal insulation cotton, which comprises the following steps:

[0158] The filament fibers and low-melting-point polyester long fibers are arranged in a mass ratio of 17:3 to form a linear cotton web.

[0159] The cotton mesh is sequentially shaped through three steps of oven heat setting, hot rolling setting and cold air setting to form a long-fiber sheet, thereby obtaining the washable and anti-drilling long-fiber thermal insulation cotton product.

[0160] The oven heat setting temperature is 130° C., the hot rolling setting temperature is 90° C., and the cold air setting cold air speed is 10 m / s.

[0161] Example 8

[0162] This embodiment provides a washable, lint-proof long-fiber thermal insulation cotton, comprising a long-fiber sheet formed by bonding filament fibers and low-melting-point fibers in a mass ratio of 17:3, wherein the filament fibers are cotton fibers, and the low-melting-point fibers are low-melting-point polyester long fibers.

[0163] This embodiment also provides a method for preparing the above-mentioned washable, anti-drilling, long-fiber thermal insulation cotton, which comprises the following steps:

[0164] The filament fibers and low-melting-point polyester long fibers are arranged in a mass ratio of 17:3 to form a grid-like cotton net.

[0165] The cotton mesh is sequentially shaped through three steps of oven heat setting, hot rolling setting and cold air setting to form a long-fiber sheet, thereby obtaining the washable and anti-drilling long-fiber thermal insulation cotton product.

[0166] The oven heat setting temperature is 130° C., the hot rolling setting temperature is 90° C., and the cold air setting cold air speed is 10 m / s.

[0167] Examples 9-15

[0168] Examples 9 to 15 respectively provide a washable, lint-proof, long-fiber thermal insulation cotton, comprising a long-fiber sheet formed by bonding filament fibers and low-melting-point fibers in a mass ratio of 17:3. The only difference between Examples 9 to 15 and Example 6 is that filament fibers of different materials are used.

[0169] The filament fibers described in Examples 9 to 15 are lyocell fiber, modal fiber, acrylic fiber, spandex, sheep wool, cashmere, and silk, respectively.

[0170] The preparation methods of Examples 9 to 15 are the same as those of Example 6.

[0171] Comparative Example 1

[0172] This comparative example is a commercially available spray-bonded cotton made of ordinary polyester staple fibers.

[0173] Performance Testing

[0174] Compression elasticity:

[0175] The test was carried out according to the constant pressure method in Method A of GB / T 24442.1-2009 “Determination of compressive properties of textiles - Part 1: Constant pressure method”.

[0176] Washability:

[0177] The samples were washed five times using the 4G washing procedure for a standard washing machine (Type C) as specified in GB / T 8629-2017, Textiles - Household Washing and Drying Procedures for Testing. The samples were then dried using the F procedure. The longitudinal and transverse shrinkage changes in the wash shrinkage of the samples were measured.

[0178] According to the 4G washing procedure of a standard washing machine of type C specified in GB / T 8629-2017 "Textiles - Household washing and drying procedures for testing", the samples were washed 20 times and then dried according to the F procedure. The thickness change rate of the samples after washing was measured.

[0179] Anti-drilling property:

[0180] The down resistance of unwashed samples was measured according to GB / T 12705.1-2024 “Test method for down resistance of textiles - Part 1: Friction method”.

[0181] The samples were washed according to the 4N washing procedure of a standard washing machine of type C specified in GB / T 8629-2017 “Textiles - Household washing and drying procedures for testing”, and then dried according to the F procedure. The post-wash lint resistance of the samples was then measured.

[0182] Air permeability:

[0183] The air permeability is determined according to GB / T5453-1997 “Determination of Air Permeability of Textile Fabrics”.

[0184] Various performance tests were performed on Examples 1-15 and Comparative Example 1. The test results are shown in Table 1:

[0185] Table 1

[0186]

[0187] Note: “-” in the above table means that the test was not conducted.

[0188] As can be seen from Table 1, the washable and anti-drilling long-fiber thermal insulation cotton provided by the present invention is superior to the thermal insulation cotton made of traditional polyester staple fibers in various performance tests. Taking Example 1 and Comparative Example 1 as an example, the compression elasticity of the washable and anti-drilling long-fiber thermal insulation cotton obtained in Example 1 reaches 98.8%, and the longitudinal and lateral changes in the washing shrinkage after washing are also small, wherein the longitudinal and lateral changes in the washing shrinkage are improved by 131.6% and 83.8% relative to ordinary fiber thermal insulation cotton, and after multiple washings, the change rate of its washing thickness is low, and there is almost no change in appearance; In addition, the washable and anti-drilling long-fiber thermal insulation cotton obtained in Example 1 is also significantly superior to traditional polyester staple thermal insulation cotton in terms of washing and anti-drilling performance, and in terms of air permeability, it is also significantly improved compared with the comparative example, with the air permeability increased by 72.2%.

[0189] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A washable and anti-drilling long-fiber thermal insulation cotton, characterized in that: Including long fiber sheets formed by bonding filament fibers; The filament fibers are bonded together by hot-melt bonding of at least one of low-melting-point fibers and low-melting-point fiber powder; The filament fibers are arranged to form a linear cotton web or a grid-like cotton web before bonding; The filament fibers are stretched and bonded to form a long fiber sheet; When the filament fiber is one or more of lyocell fiber, modal fiber, acrylic fiber, and polypropylene fiber, the cross section of the filament fiber is one of circular, cross-shaped, snowflake-shaped, C-shaped, H-shaped, star-shaped, Y-shaped, trefoil-shaped, or figure eight-shaped; When the low-melting-point fiber is polyester or nylon, the low-melting-point fiber is FDY or DTY, the fiber fineness of the low-melting-point fiber before stretching is 0.8D~1000D, the number of single fibers per fiber is 10~300F, and the fiber fineness after stretching is 0.1D~15D, the number of single fibers per fiber is 10~300F; The low-melting-point fiber is a low-melting-point long fiber, and the low-melting-point long fiber is a semi-melting sheath-core composite fiber or a fully-melting low-melting-point fiber; When the filament fibers are bonded via the low-melting-point fibers, the mass ratio of the filament fibers to the low-melting-point fibers is (1-99):1; When the filament fibers are bonded by low-melting-point fiber powder, the mass ratio of the filament fibers to the low-melting-point fiber powder is (49-99):1; When the filament fibers are bonded together by the low-melting-point fiber and the low-melting-point fiber powder, the mass ratio of the filament fibers, the low-melting-point fiber and the low-melting-point fiber powder is (25-98): (1-24): 1; The low melting point fiber powder is hot melt powder.

2. The washable and anti-drilling long-fiber thermal insulation cotton according to claim 1, characterized in that: It also includes at least one short fiber thermal insulation layer made of short fibers, and the short fiber thermal insulation layer is bonded to the long fiber sheet.

3. The washable and anti-drilling long-fiber thermal insulation cotton according to claim 1, characterized in that: The curl of the filament fiber is 10% to 90%, and the number of curls is 5 to 30 per 25 mm; the curl of the low-melting-point fiber is 10% to 90%, and the number of curls is 5 to 30 per 25 mm; the fiber distribution density of the long fiber sheet is 100 to 300,000 fibers / m 2 The weight range of the long fiber sheet is 10~1000g / m 2 The area of ​​a single mesh of the mesh is 0.01~100mm 2 .

4. The method for manufacturing the washable and anti-drilling long-fiber thermal insulation cotton according to claim 1, characterized in that: The following steps are involved: Arrange the filament fibers and the low-melting-point fibers to form a linear cotton web or a grid-like cotton web; The low-melting-point fibers are melted and bonded to the filament fibers through heating and shaping to form long-fiber sheets, thereby obtaining the washable, lint-proof, long-fiber thermal insulation cotton product.

5. The method for manufacturing the washable and anti-drilling long-fiber thermal insulation cotton according to claim 2, characterized in that: The following steps are involved: Arrange the filament fibers and the low-melting-point fibers to form a linear cotton web or a grid-like cotton web; The low-melting-point fibers are melted by heating and setting to bond the filament fibers to form a long-fiber sheet; The short fibers are laid out to form a short fiber insulation layer; Place the short-fiber insulation layer between two long-fiber sheets; After heating, shaping and bonding, the finished product of the washable and anti-drilling long-fiber thermal insulation cotton is obtained.

6. The method for manufacturing the washable and anti-drilling long-fiber thermal insulation cotton according to claim 4 or 5, characterized in that: The preparation method of the filament fiber comprises: The polyester chips are added to the screw extruder and metered by the spinning pump, so that the polymer fluid is continuously and evenly extruded from the holes of the spinneret or spinneret, and then cooled or solidified to obtain filament fibers; The polyester chips are one or more of virgin polyester chips, recycled polyester chips and bio-based polyester chips; The regenerated polyester chips are prepared by recycling waste mineral water bottles, clothing scraps or waste clothing.

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