A method for preparing a knitted felt fabric by using water-soluble filaments to spun low-twist wool yarn and the knitted felt fabric itself.

Abstract

This invention belongs to the field of textile materials technology, and provides a method for preparing low-twist wool yarn spun with water-soluble filaments for knitted felt fabric, as well as the knitted felt fabric itself. This invention utilizes the reinforcing effect of water-soluble filaments during spinning to significantly reduce yarn twist while maintaining high strength. By reducing the twist of the fine yarn, a loosely structured wool yarn can be obtained, improving the effect and quality of felting. Combined with the reinforcing effect of water-soluble filaments, this invention resolves the contradiction between the textile processing strength requirements and the loose structure needed for felting in knitted felt fabric yarn. By controlling the spacing between the water-soluble filaments and the wool roving, as well as the type of the twist triangle, the water-soluble filaments and wool roving can form intertwine without covering, thus ensuring yarn strength while achieving successful dissolution of the water-soluble filaments. The results of the embodiments show that the breaking strength of the low-twist wool yarn spun with water-soluble filaments provided by this invention is 397.60 cN.

Description

Technical Field

[0001] This invention relates to the field of textile materials technology, and in particular to a method for preparing a knitted felt fabric by using water-soluble filaments to spin low-twist wool yarn, and the knitted felt fabric itself. Background Technology

[0002] Wool fibers have a "felt-like" property due to their surface scale structure and natural crimp. Felt processing refers to the use of the felt-like property of wool fibers to mechanically squeeze and rub wool fabrics under humid and hot conditions. Due to the "directional friction effect", the wool fibers in the fabric generate a centroid movement, interweave and felt each other, and the fabric shrinks to form a unique tight felt structure.

[0003] Good felting effect and nap quality require low resistance to the wool fibers in the yarn during insertion and movement. This necessitates a loose yarn structure with weak inter-fiber interactions, facilitating the insertion and movement of wool fibers. Conversely, if the fibers are tightly packed and interact strongly, wool insertion and movement become difficult, resulting in poor felting effect. Given a specific spinning method, the yarn structure and the strength of inter-fiber interactions depend on the yarn twist. High twist results in a tight structure, strong inter-fiber interactions, and high yarn strength; conversely, low twist leads to a looser structure, weaker inter-fiber interactions, and lower yarn strength. Therefore, from the perspective of ensuring a good felting effect, a looser yarn structure and less twist are desirable. However, low yarn twist results in low yarn strength, increased breakage rates during spinning and weaving, and may even prevent normal production.

[0004] Therefore, how to balance the contradiction between the textile processing strength requirements of yarn used in knitted felt fabrics and the loose structure required for felting has become a technical problem that urgently needs to be solved in this field. Summary of the Invention

[0005] The purpose of this invention is to provide a method for preparing a knitted felt fabric by using water-soluble filaments to spin low-twist wool yarn and the knitted felt fabric itself. The knitted felt fabric provided by this invention uses water-soluble filaments to spin low-twist wool yarn, which significantly reduces yarn twist while maintaining high strength. This solves the contradiction between the textile processing strength requirements and the loose structure required for knitted felt fabric yarn.

[0006] To achieve the above-mentioned objectives, the present invention provides the following technical solution:

[0007] This invention provides a knitted felt fabric with water-soluble filament spun into low-twist wool yarn, wherein the water-soluble filament spun into low-twist wool yarn is obtained by a fine spinning process of water-soluble filament and wool roving.

[0008] The dissolution temperature of the water-soluble filament is ≤80℃;

[0009] In the spinning process, the twist of the spinning yarn is reduced by 15-45% compared to the twist of the wool yarn without water-soluble filaments; the twist triangle between the water-soluble filaments and the wool roving is an isosceles triangle; and the distance between the water-soluble filaments and the wool roving output from the front roller nip is 2-4 mm.

[0010] Preferably, the water-soluble filament has a bus density ≤75D and a single filament number of 12 to 48F.

[0011] Preferably, when the twist of the fine yarn is 15-20% lower than that of the wool yarn without water-soluble filaments, the distance between the water-soluble filaments and the wool roving output from the front roller nip is 3-4 mm; when the twist of the fine yarn is 20-45% lower than that of the wool yarn without water-soluble filaments, the distance between the water-soluble filaments and the wool roving output from the front roller nip is 2-3 mm.

[0012] Preferably, the ratio of the water-soluble filament to the wool roving is 1:1.

[0013] Preferably, the water-soluble filament comprises water-soluble polyvinyl alcohol filament.

[0014] Preferably, the wool roving includes pure wool roving or blended wool roving.

[0015] The present invention provides a method for preparing the knitted felt fabric with water-soluble filament spun with low-twist wool yarn as described in the above technical solution, comprising: passing water-soluble filament and wool roving through a spinning process to obtain the knitted felt fabric with water-soluble filament spun with low-twist wool yarn.

[0016] The present invention also provides a knitted felt fabric, wherein the knitted felt fabric is prepared by weaving, dissolving the water-soluble filament, humidifying, pre-shrinking, dehydrating and shrinking the knitted felt fabric prepared by the above-described technical solution using water-soluble filaments spun with low-twist wool yarn, or by knitting the knitted felt fabric prepared by the above-described preparation method using water-soluble filaments spun with low-twist wool yarn.

[0017] Preferably, the time for dissolving the water-soluble filaments is 3 to 15 minutes.

[0018] This invention provides a method for preparing a low-twist wool yarn for knitted felt fabric using water-soluble filaments. The water-soluble filament-spun low-twist wool yarn is obtained by spinning water-soluble filaments and wool roving through a spinning process. The dissolution temperature of the water-soluble filaments is ≤80℃. In the spinning process, the twist of the spinning yarn is reduced by 15-45% compared to the twist of the wool yarn without water-soluble filaments. The twist triangle between the water-soluble filaments and the wool roving is an isosceles triangle. The distance between the water-soluble filaments and the wool roving output from the front roller nip is 2-4 mm. This invention utilizes the reinforcing effect of water-soluble filaments during spinning to significantly reduce yarn twist while maintaining high strength. By reducing the twist of the fine yarn, a loosely structured wool yarn can be produced, which is beneficial for subsequent felting processing, improving the effect and quality of felting. Combined with the reinforcing effect of water-soluble filaments, this invention resolves the contradiction between "yarn should have a high twist to give it a certain strength to meet the strength requirements of spinning and weaving processing" and "yarn should have a low twist to give it a looser structure to improve the effect and quality of felting processing." By controlling the spacing between the water-soluble filaments and the wool roving output from the front roller nip, as well as the type of the twist triangle between the water-soluble filaments and the wool roving, the water-soluble filaments and wool roving can form intertwine without covering, thus ensuring the smooth dissolution of the water-soluble filaments while maintaining yarn strength. The results of the embodiments show that the breaking strength of the knitted wool fabric provided by the present invention, which is 397.60 cN with water-soluble filament spun with low-twist wool yarn, is 4.73 CV, the breaking elongation is 12.83%, and the elongation unevenness is 4.61 CV.

[0019] The beneficial effects of this invention are:

[0020] (1) The present invention uses water-soluble filaments to "accompany spinning" to reduce the twist of the yarn used in knitted felt fabrics, thus resolving the contradiction between "the yarn should have a high twist to give it a certain strength and meet the requirements of spinning and weaving processing for yarn strength" and "the yarn should have a low twist to give it a looser structure and improve the effect and quality of felt processing".

[0021] (2) Reducing the spinning twist can increase the spinning output. During the spinning process, the spindle speed remains constant, and the change in twist is achieved by changing the output speed of the front roller. Twist = spindle speed / front roller output speed. Therefore, reducing the spinning twist can increase the output speed of the front roller, thereby increasing the spinning output.

[0022] (3) The incorporation of water-soluble filaments can reduce the spinning twist and, to a certain extent, increase the yarn strength and reduce the yarn strength unevenness. Therefore, it can reduce the breakage rate of spinning and weaving, improve the efficiency of spinning and weaving, and increase production benefits.

[0023] (4) Reducing the yarn twist in the fabric can improve the shrinking effect, shorten the time for humidification, pre-shrinking, and shrinking processing, and improve production efficiency. Conventional humidification, pre-shrinking, and washing with water (around 50°C) takes about 30 minutes. The purpose is to relax the internal stress of the fabric, ensure uniform impregnation, allow the fibers to absorb moisture and expand, and produce a small amount of nap (wool fibers protruding from the yarn). In this invention, the process of dissolving water-soluble filaments has already partially completed this task, thus shortening the processing time by 40-50%. Conventional shrinking finishing time varies from product to product, generally ranging from 60 to 120 minutes. However, in this invention, after dissolving water-soluble filaments, the fabric structure becomes looser, which can shorten the shrinking finishing time for the same product by 20-30%. Attached Figure Description

[0024] Figure 1 The fine yarn spinning process in the method for preparing low-twist wool yarn by water-soluble filament spun with knitted wool fabric provided by the present invention is shown in the flowchart.

[0025] Figure 2 A schematic diagram of the process in which water-soluble filaments and wool rovings are intertwined to form water-soluble filaments and low-twist wool yarn in the fine spinning step of the method for preparing low-twist wool yarn with water-soluble filaments in knitted wool fabric provided by the present invention.

[0026] Figure 3 The image shows a physical picture of the knitted wool fabric prepared in Example 1 of the present invention, which is spun with water-soluble filaments and low-twist wool yarn.

[0027] Figure 4 This is a photograph of the knitted felt fabric before the water-soluble filaments were dissolved in Application Example 1 of the present invention.

[0028] Figure 5 This is a photograph of the knitted wool fabric used in Application Example 1 of the present invention. Detailed Implementation

[0029] This invention provides a knitted felt fabric with water-soluble filament spun into low-twist wool yarn, wherein the water-soluble filament spun into low-twist wool yarn is obtained by a fine spinning process of water-soluble filament and wool roving.

[0030] The dissolution temperature of the water-soluble filament is ≤80℃;

[0031] In the spinning process, the twist of the spinning yarn is reduced by 15-45% compared to the twist of the wool yarn without water-soluble filaments; the twist triangle between the water-soluble filaments and the wool roving is an isosceles triangle; and the distance between the water-soluble filaments and the wool roving output from the front roller nip is 2-4 mm.

[0032] The knitted felt fabric provided by this invention uses water-soluble filaments to spun low-twist wool yarn, which is produced by spinning water-soluble filaments and wool rovings. This invention uses water-soluble filaments and wool rovings to prepare the knitted felt fabric. The water-soluble filaments, through their reinforcing effect, significantly reduce yarn twist while maintaining high strength, ensuring smooth spinning and weaving. This resolves the contradiction between "yarn should have high twist to impart sufficient strength to meet the strength requirements of spinning and weaving" and "yarn should have low twist to impart a looser structure and improve the effect and quality of felt processing." This invention uses water-soluble filaments, which provide better reinforcement and maintain the structural integrity of the short-fiber yarn even after dissolving.

[0033] In this invention, the dissolution temperature of the water-soluble filament is ≤80℃. By using water-soluble filaments with a dissolution temperature within the above range, this invention avoids damage to the properties of wool caused by high temperatures during the dissolution process of the water-soluble filaments.

[0034] In this invention, the bus density of the water-soluble filament is preferably ≤75D; the number of individual filaments of the water-soluble filament is preferably 12-48F. The use of water-soluble filaments with the above specifications is beneficial for reducing raw material costs and wastewater treatment costs.

[0035] In this invention, the water-soluble filament preferably comprises water-soluble polyvinyl alcohol filament. This invention does not impose any particular limitation on the source of the water-soluble polyvinyl alcohol filament; commercially available products well-known to those skilled in the art can be used.

[0036] In this invention, the water-soluble filament is preferably white.

[0037] In this invention, the wool roving preferably includes pure wool roving or blended wool roving. This invention does not impose any particular limitation on the composition and proportion of the wool roving; any wool roving well-known to those skilled in the art can be used. In this invention, the blended wool roving is preferably a wool-polyester blended yarn; the preferred mass ratio of wool to polyester in the wool-polyester blended yarn is 60:40.

[0038] In this invention, the preferred ratio of water-soluble filaments to wool roving is 1:1.

[0039] In this invention, during the spinning process, the twist of the spinning yarn is reduced by 15-45%, preferably 20-40%, compared to the twist of the wool yarn without water-soluble filaments. By reducing the twist of the spinning yarn, this invention produces a loosely structured wool yarn, which is beneficial for subsequent felting processing, improving the effect and quality of felting. Combined with the reinforcing effect of the water-soluble filaments, it resolves the contradiction between "yarn should have a high twist to impart a certain strength to meet the strength requirements of spinning and weaving" and "yarn should have a low twist to impart a looser structure to improve the effect and quality of felting processing." Furthermore, reducing the twist of the spinning yarn improves the hand feel and luster of the resulting knitted felted fabric, enhancing the product's quality competitiveness and added value. However, in this invention, when the twist is reduced by more than 45%, the wool roving is prone to breakage and cannot be spun normally. The fabric produced by spinning the low-twist wool yarn with the resulting water-soluble filaments will also be too soft and unsuitable for subsequent felting processing.

[0040] In this invention, during the spinning process, the twist triangle between the water-soluble filament and the wool roving is an isosceles triangle. This invention controls the type of twist triangle between the water-soluble filament and the wool roving by adjusting the tension of the water-soluble filament. Ideally, the water-soluble filament and the drafted wool roving sliver at the front roller nip should form an isosceles triangle. If the sides of the wool roving sliver are short, the water-soluble filament tends to wrap around the roving sliver, reducing the reinforcing effect. If the sides of the water-soluble filament are also short, the roving sliver will cover the water-soluble filament, hindering its dissolution and potentially damaging the yarn structure after dissolution.

[0041] In this invention, during the spinning process, the distance between the water-soluble filament and the wool roving output from the front roller nip is 2-4 mm. In this invention, because the wool roving oscillates left and right under its own twisting transmission as it is drafted and thinned in the drafting zone of the spinning process, a certain distance is required between the drafted wool roving and the water-soluble filament to ensure they can intertwine. In this invention, the distance between the water-soluble filament and the wool roving output from the front roller nip (the distance between the inner edges of the drafted roving and the water-soluble filament yarn) must ensure that they intertwine but do not cover each other, so as to facilitate the smooth dissolution of the water-soluble filament. If the water-soluble filament is completely or partially covered by the drafted wool roving, it will be difficult to dissolve, and the dissolution of the water-soluble filament will damage the structure of the remaining short fiber yarn. At the same time, the distance cannot be too large, because after the spinning twist decreases, the twist of the drafted wool roving output from the front roller nip will also decrease, and it will be easy to break under the lateral component of the tension of the water-soluble filament.

[0042] In this invention, the distance between the water-soluble filament and the wool roving output from the front roller nip is preferably adjusted by the lateral position of the guide roller on the spinning machine.

[0043] In this invention, when the twist of the fine yarn is 15-20% lower than the twist of the wool yarn without water-soluble filaments, the distance between the water-soluble filaments and the wool roving output from the front roller nip is preferably 3-4 mm; when the twist of the fine yarn is 20-45% lower than the twist of the wool yarn without water-soluble filaments, the distance between the water-soluble filaments and the wool roving output from the front roller nip is preferably 2-3 mm.

[0044] This invention utilizes the reinforcing effect of water-soluble filaments during spinning to significantly reduce yarn twist while maintaining high strength. By reducing the twist of the fine yarn, a loosely structured wool yarn can be produced, which is beneficial for subsequent felting processing, improving the effect and quality of felting. Combined with the reinforcing effect of water-soluble filaments, this invention resolves the contradiction between "yarn should have a high twist to give it a certain strength to meet the strength requirements of spinning and weaving processing" and "yarn should have a low twist to give it a looser structure to improve the effect and quality of felting processing." By controlling the spacing between the water-soluble filaments and the wool roving output from the front roller nip, as well as the type of the twist triangle between the water-soluble filaments and the wool roving, the water-soluble filaments and wool roving can form intertwine without covering, thus ensuring the smooth dissolution of the water-soluble filaments while maintaining yarn strength.

[0045] The present invention provides a method for preparing the knitted felt fabric with water-soluble filament spun with low-twist wool yarn as described in the above technical solution, comprising: passing water-soluble filament and wool roving through a spinning process to obtain the knitted felt fabric with water-soluble filament spun with low-twist wool yarn.

[0046] The present invention does not impose any special limitations on the operation of the spinning process; any spinning process well known to those skilled in the art can be used.

[0047] In this invention, the equipment for the spinning process is preferably a ring spinning machine.

[0048] The fine spinning process in the method for preparing low-twist wool yarn with water-soluble filaments for knitted felt fabric provided by this invention is as follows: Figure 1As shown, the roving tube 2 is suspended on the spindle 1 of the roving frame of the spinning frame. After the wool roving 3 is unwound radially from the roving tube 2, it is fed into the nip of the rear roller 10 of the drafting device through the collector 9 at the rear of the drafting device under the guidance of the guide rod 4. It then passes through the middle roller 11 with upper and lower rubber rings and the front roller 12 in sequence. After being drafted by the drafting device, it is output from the nip of the front roller. The water-soluble filament yarn tube 5 is placed on the main air duct (square metal pipe) below the roving frame. The water-soluble filament 6 unwound from it is guided by the guide hook 7 located above the center line of the yarn tube 5. The yarn is unwound axially, passes through the spring tension device 8, and is fed into the front roller nip from the rear of the front upper roller of the drafting device under the guidance of the grooved guide roller 13. It is output from the front roller nip while maintaining a certain distance from the drafted wool roving. After the drafted wool roving meets the water-soluble filament, it is twisted under the action of twisting to form the low-twist wool yarn 14 of the knitted felt fabric with water-soluble filament. The low-twist wool yarn of the knitted felt fabric with water-soluble filament passes through the guide hook 15, then through the wire loop 17 located on the steel ring 16, and is wound onto the yarn tube 18.

[0049] The schematic diagram of the preparation method of low-twist wool yarn with water-soluble filament in the spinning process of the knitted wool fabric provided by the present invention, in which water-soluble filament and wool roving are intertwined to form water-soluble filament low-twist wool yarn, is shown below. Figure 2 As shown, the drafted wool roving and water-soluble filament are output from the front roller nip at a certain distance and twisted into a twisted triangle under the action of twisting. The twisting return is transmitted from the twisting point (the wire loop) to the feeding point (the front roller nip), so that the short fiber sliver and filament in the twisted triangle are first weakly twisted and then twisted together to form a low-twist wool yarn spun with water-soluble filament.

[0050] The present invention also provides a knitted felt fabric, wherein the knitted felt fabric is prepared by weaving, dissolving the water-soluble filament, humidifying, pre-shrinking, dehydrating and shrinking the knitted felt fabric prepared by the above-described technical solution using water-soluble filaments spun with low-twist wool yarn, or by knitting the knitted felt fabric prepared by the above-described preparation method using water-soluble filaments spun with low-twist wool yarn.

[0051] This invention does not impose any special limitations on the weaving operation; any weaving technique well-known to those skilled in the art can be used. In this invention, the weaving method is preferably knitting; and the fabric structure of the knitted fabric is preferably a plain weave.

[0052] This invention does not impose any particular limitation on the operation of dissolving water-soluble filaments; any method well-known to those skilled in the art for dissolving water-soluble fibers can be used. In this invention, the preferred method for dissolving water-soluble filaments is hot water dissolution.

[0053] In this invention, the hot water temperature for dissolving the water-soluble filaments is preferably determined based on the dissolution temperature of the water-soluble filaments used.

[0054] In this invention, the time for dissolving water-soluble filaments is preferably 3 to 15 minutes, more preferably 3 to 10 minutes.

[0055] In this invention, the equipment for dissolving water-soluble filaments is preferably a washing machine; the medium used for dissolving water-soluble filaments is preferably clean water.

[0056] The present invention does not impose any special limitations on the operation of humidification, pre-shrinking, dehydration and shrinking, and any technical solutions for humidification, pre-shrinking, dehydration and shrinking that are well known to those skilled in the art can be used.

[0057] The knitted felt fabric provided by this invention has good felt quality, a soft hand feel, and a good luster.

[0058] The technical solutions of this invention will be clearly and completely described below with reference to the embodiments thereof. Obviously, the described embodiments are only a part of the embodiments of this invention, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0059] Example 1

[0060] A knitted felt fabric is made by spinning low-twist wool yarn with water-soluble filaments, which is produced by spinning water-soluble polyvinyl alcohol filaments and wool rovings through a fine spinning process.

[0061] The yarn count of the water-soluble filament spun with low-twist wool yarn is 31.6 metric count (excluding the water-soluble polyvinyl alcohol filament portion);

[0062] The specifications of the water-soluble polyvinyl alcohol filament are 50D / 15F, the color is white, and the melting temperature is 80℃.

[0063] The wool roving is a wool roving blend of 60% wool and 40% polyester.

[0064] The ratio of water-soluble polyvinyl alcohol filament to wool roving is 1:1;

[0065] In the spinning process, the twist of the yarn is 452 twists / meter, and the twist coefficient α m The twist is 80, which is 20% lower than that of wool yarn without water-soluble filaments; the twist triangle between the water-soluble polyvinyl alcohol filaments and the wool roving is an isosceles triangle; the distance between the water-soluble polyvinyl alcohol filaments and the wool roving output from the front roller nip is set to 4mm.

[0066] Figure 3 This is a photograph of the knitted wool fabric in this embodiment, spun with water-soluble filaments and low-twist wool yarn. Figure 3 It can be seen that the water-soluble polyvinyl alcohol filaments are exposed on the yarn surface.

[0067] Example 2

[0068] A knitted felt fabric is made by spinning low-twist wool yarn with water-soluble filaments, which is produced by spinning water-soluble polyvinyl alcohol filaments and wool rovings through a fine spinning process.

[0069] The yarn count of the water-soluble filament spun with low-twist wool yarn is 31.6 metric count (excluding the water-soluble polyvinyl alcohol filament portion);

[0070] The specifications of the water-soluble polyvinyl alcohol filament are 50D / 15F, the color is white, and the melting temperature is 70℃.

[0071] The wool roving is a wool roving blend of 60% wool and 40% polyester.

[0072] The ratio of water-soluble polyvinyl alcohol filament to wool roving is 1:1;

[0073] In the spinning process, the twist of the yarn is 339 twists / meter, and the twist coefficient α m The twist is 60, which is 40% lower than that of wool yarn without water-soluble filaments; the twist triangle between the water-soluble polyvinyl alcohol filaments and the wool roving is an isosceles triangle; the distance between the water-soluble polyvinyl alcohol filaments and the wool roving output from the front roller nip is set to 2mm.

[0074] Comparative Example 1

[0075] Wool yarn that does not contain water-soluble filaments is made from wool roving through a spinning process;

[0076] The yarn count of the wool yarn that does not contain water-soluble filaments is 31.6 metric count;

[0077] The wool roving is a wool roving blend of 60% wool and 40% polyester.

[0078] In the spinning process, the twist of the yarn is 565 twists / meter, and the twist coefficient α m It is 100.

[0079] The tensile breaking properties of the composite yarns in Examples 1-2 and Comparative Example 1 were determined according to GB / T 3916-2013 "Determination of breaking strength and elongation at break of single yarn in packaged yarn (CRE method)". The test results are shown in Table 1.

[0080] Table 1. Tensile breaking properties of the composite yarns in Examples 1-2 and Comparative Example 1

[0081]

[0082] As can be seen from the table, although the spinning twist of the knitted felt fabric spun with water-soluble filaments in Examples 1 and 2 was reduced by 20% and 40% respectively compared to Comparative Example 1, the breaking strength of the knitted felt fabric spun with water-soluble filaments in Examples 1 and 2 increased by 51.46% and 55.89% respectively due to the incorporation and intertwisting of the water-soluble polyvinyl alcohol filaments, while the strength unevenness decreased by 66.64% and 72.67% respectively. The increase in strength of the knitted felt fabric spun with water-soluble filaments in Examples 1 and 2 is due to the merging effect of the water-soluble filaments and the increased fiber axiality in the short fiber yarn after the twist reduction, which increases the axial component of the yarn strength. The significant reduction in strength unevenness is mainly due to the merging effect of the water-soluble filaments, which significantly reduces the weak link in strength of the knitted felt fabric spun with water-soluble filaments in Examples 2 and 2. The use of water-soluble filaments in knitted felt fabrics to spun low-twist yarns increases both the strength and reduces the strength unevenness, thus improving spinning and weaving efficiency (reducing yarn breakage rates). The breaking elongation of knitted felt fabrics spun with water-soluble filaments is lower than that of ordinary yarns because the breaking elongation of water-soluble filaments is relatively low; once the water-soluble filaments break, the remaining short fibers disintegrate. However, since knitted felt fabrics still retain over 12% breaking elongation even when spun with water-soluble filaments, the reduction in breaking elongation has no impact on spinning and weaving processes, and the removal of the water-soluble filaments does not affect the fabric's elasticity.

[0083] Application Example 1

[0084] The knitted felt fabric from Example 1 was knitted, the water-soluble filaments were dissolved, humidified, pre-shrinked, dehydrated and spun into low-twist wool yarn in sequence to obtain the knitted felt fabric.

[0085] The temperature for dissolving water-soluble filaments was 80℃, the time was 3 minutes, the equipment was a washing machine, and the medium was clean water; the knitted fabric structure was plain weft knit.

[0086] Figure 4 This is a photograph of the knitted wool fabric before the water-soluble filaments were dissolved, as shown in Example 1. Figure 4 In the image, the white patches on the yarn and fabric are exposed water-soluble filaments on the yarn surface.

[0087] Figure 5 This is a photograph of the knitted wool fabric used in Application Example 1. Figure 5 It can be seen that the water-soluble filaments are completely dissolved.

[0088] As can be seen from the above embodiments, the knitted felt fabric provided by the present invention, using water-soluble filaments spun with low-twist wool yarn, significantly reduces yarn twist while maintaining high strength, thus resolving the contradiction between the textile processing strength requirements and the need for a loose structure to facilitate felting in knitted felt fabrics. The breaking strength of the knitted felt fabric provided by the present invention, using water-soluble filaments spun with low-twist wool yarn, is 397.60 cN, with a strength unevenness of 4.73 CV, a breaking elongation of 12.83%, and an elongation unevenness of 4.61 CV.

[0089] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A knitted wool fabric with water-soluble filament spun into low-twist wool yarn, wherein the water-soluble filament spun into low-twist wool yarn is obtained by a spinning process of water-soluble filament and wool roving. The dissolution temperature of the water-soluble filament is ≤80℃; In the spinning process, the twist of the spinning yarn is reduced by 15-45% compared to the twist of the wool yarn without water-soluble filaments; the twist triangle between the water-soluble filaments and the wool roving is an isosceles triangle; the distance between the water-soluble filaments and the wool roving output from the front roller nip is 2-4 mm. When the twist of the fine yarn is reduced by 15-20% compared to the twist of the wool yarn without water-soluble filaments, the distance between the water-soluble filaments and the wool roving output from the front roller nip is 3-4 mm; when the twist of the fine yarn is reduced by 20-45% compared to the twist of the wool yarn without water-soluble filaments, the distance between the water-soluble filaments and the wool roving output from the front roller nip is 2-3 mm.

2. The knitted wool fabric according to claim 1, characterized in that, is spun with water-soluble filaments and low-twist wool yarn. The water-soluble filament has a bus density ≤75D and a single filament count of 12~48F.

3. The knitted woolen fabric according to claim 1, characterized in that, is spun with water-soluble filaments and low-twist wool yarn. The ratio of water-soluble filaments to wool rovings is 1:

1.

4. The knitted woolen fabric according to claim 1 or 2, spun with water-soluble filaments and low-twist wool yarn, is characterized in that... The water-soluble filaments include water-soluble polyvinyl alcohol filaments.

5. The knitted woolen fabric according to claim 1, characterized in that, The wool roving includes pure wool roving or blended wool roving.

6. The method for preparing the knitted woolen fabric according to any one of claims 1 to 5 by spinning low-twist woolen yarn with water-soluble filament, comprising: Water-soluble filaments and wool rovings are spun into a fine yarn to obtain knitted wool fabric. Low-twist wool yarn is spun with water-soluble filaments.

7. A knitted felt fabric prepared by the method of preparing low-twist woolen yarn with water-soluble filament as described in claim 6, wherein the knitted felt fabric is obtained by weaving, dissolving the water-soluble filament, humidifying, pre-shrinking, dehydrating and shrinking the low-twist woolen yarn with water-soluble filament.

8. The knitted felt fabric according to claim 7, characterized in that, The time for dissolving the water-soluble filaments is 3 to 15 minutes.

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