Spun yarn for loop pile, method for manufacturing the same, loop pile towel using the same, and method for manufacturing the same

Abstract

This invention provides spun yarn for loop piles, loop pile towels, and methods for manufacturing these, which have excellent pile-raising properties and high water absorption, washability, and durability. [Solution] The spun yarn for loop piles contains cotton fibers and does not contain water-soluble fibers. The spun yarn for loop piles is a single yarn that is untwisted or loosely twisted, and has uneven twisting in the length direction of the yarn. In this manufacturing method, when multiple rovings 12a and 12b are twisted together by a traveler 22 using a Cyrosspun spinning machine 10 to create an untwisted or loosely twisted single yarn, a false twist is added by a friction belt 25 upstream of the traveler 22 to impart uneven twisting in the length direction of the yarn before winding.

Description

[Technical Field]

[0001] This invention relates to a spun yarn for loop piles using siro spun yarn as the pile yarn, a method for manufacturing the same, and a loop pile towel using the same and a method for manufacturing the same. [Background technology]

[0002] Traditionally, towel fabrics are basically made by using warp pile yarns, warp and weft yarns to create a pile weave. In addition, to ensure good water absorption, towel fabrics have a relatively high basis weight (mass per unit area), and the constituent yarns are thick and of high fineness. Patent Document 1 proposes using synthetic fiber silospun spun yarn to create a melange yarn for pile fabrics. Patent Documents 2 and 3 propose using loosely twisted silospun spun yarn to create a pile knit fabric. In Patent Document 4, the present inventors propose a silospun spun yarn using two or more rovings, which is either untwisted or loosely twisted. [Prior art documents] [Patent Documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 10-088440 [Patent Document 2] Japanese Patent Publication No. 2019-137941 [Patent Document 3] Japanese Patent Publication No. 2019-137942 [Patent Document 4] Patent No. 7372718 [Overview of the Initiative] [Problems that the invention aims to solve]

[0004] However, the aforementioned conventional technology had problems with towel properties such as water absorption, washability, and durability, and further improvements were needed.

[0005] To solve the aforementioned conventional problems, the present invention provides a spun yarn for loop piles that has good pile fluffing properties, a soft and voluminous texture, and high water absorption, washability, and durability, as well as a method for manufacturing the same, and a loop pile towel using the same and a method for manufacturing the same. [Means for solving the problem]

[0006] One embodiment of the present invention relates to a spun yarn for loop piles containing cotton fibers, which does not contain water-soluble fibers, and the spun yarn for loop piles is a single yarn that is untwisted or loosely twisted, and has uneven twisting in the length direction of the yarn.

[0007] Another embodiment of the present invention is a method for producing the spun yarn for loop pile described above, This invention relates to a method for manufacturing loop pile yarn, which involves drafting multiple rovings using a Sirospun spinning machine, twisting them together to produce untwisted or loosely twisted spun yarn singles, and then adding a false twist to impart twist unevenness in the length direction of the yarn before winding.

[0008] Yet another embodiment of the present invention relates to a loop pile towel using the aforementioned loop pile spun yarn, wherein the pile yarn is open from the base to the top and is raised substantially perpendicular to the background fabric.

[0009] A further embodiment of the present invention relates to a method for manufacturing a loop pile towel, wherein the yarn is sized a first time in a cheese (spooled yarn) state, then sized a second time in a yarn state after warping and reinforced with sizing, the warping speed is 500 m / min or less, and the loom rotation speed (number of times the weft yarn is beaten per minute) is 200 to 350 rpm to manufacture the loop pile towel. [Effects of the Invention]

[0010] The loop pile spun yarn of the present invention is composed of cotton fibers and does not contain water-soluble fibers. The loop pile spun yarn is an untwisted or loosely twisted single yarn, and due to uneven twisting along the length of the yarn, the single fibers are in a migration state where they are twisted inward or outward, resulting in entanglement between the fibers. Since each constituent fiber exists in a free state, the pile has good fluffiness, a soft and voluminous texture, and is a pile yarn with high properties such as water absorption, washability, and durability. Furthermore, in the loop pile towel of the present invention, the yarn is open from the base to the top of the pile yarn, and the pile is raised almost perpendicular to the base fabric. As a result, since each constituent fiber exists in a free state, the pile has good fluffiness, a soft and voluminous texture, and is a towel with high properties such as water absorption, washability, and durability. [Brief explanation of the drawing]

[0011] [Figure 1] Figure 1 is a schematic perspective view of a silospan spinning machine according to one embodiment of the present invention. [Figure 2] Figure 2 is a schematic diagram illustrating the towel fabric in one embodiment of the present invention. [Figure 3] Figure 3 is a woven structure diagram of the same textile towel fabric. [Figure 4] Figure 4 is a side view (100x magnification) of the pile yarn of one embodiment of the present invention (Example 1). [Figure 5] Figure 5 is a side view (100x magnification) of the pile yarn of Comparative Example 1. [Figure 6] Figure 6 is a side view (100x magnification) of the pile yarn of Comparative Example 2. [Figure 7] Figure 7 is a side view (30x magnification) of the towel fabric of one embodiment of the present invention (Example 1). [Figure 8] Figure 8 is a side view (30x magnification) of the towel fabric of Comparative Example 1. [Figure 9] Figure 9 is a side view (30x magnification) of the towel fabric of Comparative Example 2. [Figure 10] Figure 10 is a plan view (10x magnification) of towel fabric according to one embodiment of the present invention (Example 1). [Figure 11] Figure 11 is a plan photograph (magnification 10 times) of the towel fabric of Comparative Example 1. [Figure 12] Figure 12 is a plan photograph (magnification 10 times) of the towel fabric of Comparative Example 2.

Mode for Carrying Out the Invention

[0012] The spun yarn for loop pile of the present invention contains cotton fibers. Cotton fibers are excellent in water absorption and have been commonly used for towel fabrics. It does not contain water-soluble fibers such as polyvinyl alcohol (PVA). Water-soluble fibers are later dissolved in water and discarded, which not only has the problem of high cost but also the problem of environmental pollution. The spun yarn for loop pile is a single yarn of siro-spun yarn, and there are twist marks in the length direction of the yarn. As a result, as described above, the single fibers are in a migration state where they enter and exit the inside and are twisted outside, and there is entanglement between the fibers. Since each constituent fiber exists in a free state, the pile has good standing property, a soft and bulging texture, and becomes a pile yarn with high properties such as water absorption, washing resistance, and durability.

[0013] Normally, since the untwisted or slack-twisted yarn has a small number of twists, the strength of the yarn is weak and it slips out, making it difficult to wind it up with a ring spinning machine. However, in the spun yarn of the present invention, due to the presence of twist marks in the length direction of the yarn, the single fibers are in a migration state where they enter and exit the inside and are twisted outside, and due to the entanglement between the fibers, even without containing water-soluble fibers, it has a strength that can be wound up with a ring spinning machine. The twist marks can be formed by applying false twists.

[0014] The spun yarn for loop pile preferably has a twist coefficient K of 0 to 2.9, more preferably 0.5 to 2.8, and still more preferably 1 to 2.9. However, the twist coefficient (K) is calculated by the following formula (Equation 1).

Equation

[0015] The cotton fiber is preferably selected from the group consisting of long fibers and extra-long fibers, and at least one of these is preferred. Specific examples are the long fibers or extra-long fibers shown in Table 1 below. Since long fibers or extra-long fibers have a high crimp and high crimp strength, when applied to the Sirospun spun yarn of the present invention, the twist characteristics and migration of the primary twist tend to remain, the fibers tend to entangle with each other, and because it is an untwisted or loosely twisted yarn, each constituent fiber exists in a free state. For this reason, it has good pile-standing properties and becomes a pile yarn with a soft and voluminous texture.

[0016] [Table 1]

[0017] It is preferable that the cotton fibers constituting the loop pile yarn are arranged in parallel. This results in a smooth surface when the towel is made, allowing the loops of the loop pile yarn to be visible, making it immediately apparent that the towel is of high quality. Furthermore, because each constituent fiber exists in a free state, the pile has good fluffiness, resulting in a soft and voluminous texture, and a pile yarn with high properties such as water absorption, washability, and durability.

[0018] The method for producing loop pile spun yarn according to the present invention includes the following steps. (1) Sirospan spinning process The Sirospun spinning process uses a ring spinning machine to twist multiple rovings together using a traveler to produce spun yarn. At this time, the twist direction of the multiple rovings and the twist direction of the combined spun yarn are reversed to produce untwisted or loosely twisted yarn. Two to three rovings are preferred. (2) False twisting process A false twister is provided upstream of the ring-shaped rotating traveler of the ring spinning machine, thereby producing untwisted or loosely twisted spun yarn with uneven twisting. A friction false twister is preferred, more preferably a friction belt, and as an example, a false twister using an endless rubber belt is used. The false twister applies a false twist in a direction perpendicular to the plied yarn. In the case of an endless rubber belt false twister, it contacts the plied yarn twice, applying an S-twist-Z-twist or Z-twist-S-twist false twist. The speed of the endless rubber belt is preferably about 0.1 to 10 times the winding speed of the plied yarn, more preferably 0.2 to 8 times, and even more preferably 0.3 to 7 times. (3) Winding process The thread, having passed through the friction-type temporary winding machine, passes through a rotating ring-shaped traveler and is wound onto a bobbin.

[0019] In the loop pile towel of the present invention, the pile yarns are open from the root to the top, and each constituent fiber exists in a free state. Furthermore, the pile yarns are raised almost perpendicular to the base fabric. Here, the perpendicular direction is preferably 75 to 115°, more preferably 70 to 110°, even more preferably 75 to 105°, and most preferably 80 to 100°. The combination of the pile yarns being open from the root to the top and being raised almost perpendicular results in a towel with a soft and voluminous texture and high properties such as water absorption, washability, and durability.

[0020] Preferably, the pile yarns intersect once at the base, forming a single-loop standing pile. A single-loop standing pile provides a stable standing structure, making it easier for the pile to stand almost perpendicular to the background.

[0021] Preferably, the surface of the loop pile towel fabric allows the loops of the loop pile spun yarn to be visible. This makes it immediately apparent that the towel is of high quality. Furthermore, it is preferable that the cotton fibers constituting the loop pile spun yarn of the loop pile towel are arranged in parallel. As a result, each constituent fiber exists in a free state, which gives the pile good fluffiness, a soft and voluminous texture, and results in a pile yarn with high properties such as water absorption, washability, and durability.

[0022] The loop pile towel of the present invention has the following features: (1) It sheds very little lint. (2) Bulky. (3) It has a large volume and a high degree of fluffiness before washing. (4) The fluffiness is less likely to be lost after washing, and washing deterioration is less likely to occur. (5) It has minimal wetness and provides a comfortable wiping experience. (6) The residual moisture content is low immediately after dehydration. Furthermore, the single fibers are in a migration state, intertwining with each other, with some getting inside and others outside and twisted together. Each constituent fiber exists in a free state, resulting in good pile fluffiness, a soft and voluminous texture, and high water absorption, washability, and durability.

[0023] The method for manufacturing loop pile towels according to the present invention includes the following steps. All of these steps are designed to prevent yarn breakage. (1) Sizing (gluing) process The yarn is first sized in its "cheese" (spool) state, and then secondly sized in its yarn state after warping, followed by sizing and reinforcement. For the first sizing, it is preferable to sizing the yarn in its "cheese" (spool) state at 85°C for 30 minutes and then drying at 125°C for 30 minutes. For the second sizing, it is preferable to immerse the yarn in a sizing bath at 70°C at a sizing speed of 30 m / min and then drying at 140°C for 30 minutes. It is preferable to use a starch aqueous solution with good permeability as the sizing component. (2) Warping speed The warping speed is usually around 700 m / min, but it is preferably 500 m / min or less, more preferably 400 m / min or less, and even more preferably 350 m / min or less. When the yarn count is 16, the tension (strength) during warping is usually around 36 cN, but it is preferable to reduce it to 30 cN. (3) Loom rotation speed (number of times the weft thread is inserted per minute) The loom rotation speed is usually 400 rpm, but it is preferable to set it to 200-350 rpm. (4) Post-processing After weaving the towel fabric, it is bleached, scouring, dyed, and processed according to conventional methods to produce towel fabric.

[0024] The towels of the present invention are suitable for use as bath towels (after-bath towels), bath towels, face towels, towel handkerchiefs (towel chiefs), hand towels, washcloths, hand towels, bath mats, sports towels, beach towels (body towels), etc. The fabric composition, yarn type, yarn usage, and weight per unit area (basis weight) are appropriately set according to the required characteristics such as lint shedding and water absorption. The basis weight can be controlled by changing the pile length (long to short) of the pile yarn to control the basis weight (large to small). As an example of a preferred basis weight that can demonstrate the effects of the present invention, a thin fabric has a basis weight of 100 to 250 g / m². 2 For medium-weight fabrics, the weight is 250-500g / m². 2 The thicker fabrics weigh 500-1000g / m². 2 The following is preferable. Note: 100g / m 2 Those weighing less than 1000g / m² are thin and lack volume, and also... 2 Anything exceeding that is too thick and heavy, and none of them are desirable.

[0025] Furthermore, while cotton is the best material for towels in terms of texture, water absorption, moisture absorption, and ease of handling, small amounts of linen, rayon, cupro, acetate, or wool may be blended with cotton. Blends of rayon, cupro, and acetate provide moisture absorption, while wool provides heat retention. The woven raw fabric is processed according to the cotton processing method: it is descaled using a liquid flow dyeing machine, and then scouring under the conventional cotton scouring conditions (a constant temperature of 95-98°C, a holding time of 50 minutes, a dilute caustic soda solution, and an alcohol ethoxylate additive bath). Following scouring, it is bleached under conventional conditions (98°C, 50 minutes, hydrogen peroxide solution). Then it is dewatered and finished by setting it in a tenter (off-white finish). This bleaching process also involves hot water treatment. If it is desired to include crimped synthetic fibers, the crimp of the false-twist yarn is brought out during the scouring process, and then it is finished as is.

[0026] Next, when dyeing after scouring and bleaching, cotton is dyed with reactive dyes (60-80°C, 40 minutes). Polyester fibers are dyed with disperse dyes (130°C, 40 minutes). When dyeing fabrics containing cotton and polyester, in addition to dyeing solid colors using these two baths, it is also possible to dye them in different colors or chambray (shades) by using disperse dyes and reactive dyes separately. Furthermore, it is possible to print on the scouring and bleached off-white fabric. In the case of pre-dyed polyester yarn, crimping can be achieved simultaneously with scouring the yarn, and then bleaching, dyeing, and weaving can be used to obtain pre-dyed towel fabric. In the case of pre-dyed cotton yarn, scouring, bleaching, and dyeing can be used, and then weaving can be used to obtain pre-dyed towel fabric. In this way, the present invention enables the commercialization of products with excellent color and design qualities through diverse dyeing processes.

[0027] The following explanation will be given using the drawings. In the following drawings, the same reference numerals indicate the same object. Figure 1 is a schematic perspective view of a silospan spinning machine according to one embodiment of the present invention. In this silospan spinning machine 10, two roving bobbins 11a and 11b are suspended from the creel (roving supply device) for each spindle, and the rovings 12a and 12b supplied from the two roving bobbins 11a and 11b are sent in parallel to the drafting device 15 through a two-pronged trumpet guide 13 provided on the upstream side (roving bobbin side) of the back roller 14. The rovings 12a and 12b are drafted at predetermined intervals between the back roller 14 and the apron 16, and between the apron 16 and the front roller 17, respectively, to become fleece 18a and 18b. The fleece 18a and 18b are then spun from the front roller 17, twisted together to form single yarns of spun yarn 19, false-twisted by the friction belt 25 to create uneven twist in the length direction of the yarn, passed through the Snell wire 20, and then passed through the traveler 22 rotating on the ring 21 to be twisted, and wound onto the bobbin 23. The bobbin 23 is rotated by the drive belt 24. A is a magnified view of the ring 21 and the traveler 22. For example, the primary twist direction of two rovings 12a and 12b is set to the Z direction, the twisting direction by the traveler 22 is set to the S direction, and the twisting is performed in the untwisting direction. In addition, the number of twists by the traveler 22 (secondary twists) is set to be the same as or greater than the number of twists in the primary twist.

[0028] Figure 2 is a schematic diagram illustrating a towel fabric 1 according to one embodiment of the present invention. This towel fabric 1 is composed of warp pile yarns 2a, 2b, weft ground yarn 3, and warp ground yarns 4a, 4b. The warp pile yarns 2a, 2b are anchored to the ground fabric composed of the weft ground yarn 3 and warp ground yarns 4a, 4b, forming loop piles. The resulting towel fabric 1 is cut to a predetermined size and the edges are treated to become a towel. Figure 3 is a woven structure diagram of a towel fabric according to one embodiment of the present invention. This woven structure is a 3-pick terry motion structure. The warp pile yarns cross over the weft yarns once every three yarns. The warp yarns G and warp pile yarns P are arranged alternately. The weft yarns 1 to 3 indicate the order. In Figure 3, viewed from the warp, black and × indicate floating yarns, and white indicates sinking yarns.

[0029] Figure 4 is a side view (100x magnification) of a pile yarn of one embodiment of the present invention (Example 1). As is clear from Figure 4, there are parts 26 with a lot of twist and parts 27 with little twist in the length direction of the yarn, indicating uneven twisting. Uneven twisting can be identified using an optical microscope and a magnified photograph at about 100x magnification. As shown in Figure 4, there are parts 26 with a lot of twist and parts 27 with little twist in the length direction of the yarn, with the parts 26 with a lot of twist being thin and the parts 27 with little twist being thick. The parts 26 with a lot of twist have a high twist angle relative to the yarn axis and a thin yarn diameter. The parts 27 with little twist have a low twist angle relative to the yarn axis and a thick yarn diameter. The parts with a lot of twist and the parts with little twist are preferably 0.5 to 10 mm in length on average, and more preferably 1 to 8 mm in length on average. In other words, within a single cotton fiber constituting the pile yarn, there are parts with a lot of twist and parts with little twist. As shown in Table 1 above, the average fiber length of cotton fibers is 26 mm or more, and the parts with a lot of twist and the parts with little twist are considerably shorter than the average fiber length of cotton fibers. Furthermore, as is clear from Figure 4, the yarn as a whole has a bulging texture.

[0030] Figure 7 is a side view (30x magnification) of a towel fabric according to one embodiment of the present invention (Example 1). This towel fabric is composed of pile yarns 30 and a base fabric 31. The pile yarns 30 intersect once at the base, and the loop portion has the yarn opened up and raised. In other words, it is a one-loop raised pile. As a result, the pile has good napping properties, and a soft and voluminous texture is achieved.

[0031] Figure 10 is a plan view (10x magnification) of a towel fabric according to one embodiment of the present invention (Example 1). The loops are large enough to be visible, neat and well-organized, and the fabric surface is good, making it immediately apparent that this is a high-quality towel. Furthermore, because each constituent fiber exists in a free state, the pile has good fluffiness, resulting in a soft and voluminous texture, and high properties such as water absorption, washability, and durability. [Examples]

[0032] The following will be described more specifically using examples. The present invention is not limited to the following examples. <Evaluation of the texture of the finished towel fabric> (1) Evaluation of soft texture The softness of the texture is determined by the bulk height in the following formula, which is represented by the volume per 1 g of the towel fabric. The higher the value, the softer the texture and the better it is. The thickness was measured according to JIS L-1096 (2010) 8.5 bulkiness test, and the basis weight was accurately weighed as the weight of a 1 m square. The measurement locations were 5 places and represented by the average value. Bulk height (cm 3 / g) = thickness (mm) / basis weight (g / m 2 ) × 1000 (2) Evaluation of plump texture Using a towel fabric compression measuring instrument: KES-G5 (manufactured by Kato Tech Co., Ltd.), the towel fabric was compressed at a constant speed to obtain the compression work amount: WC = (gf.cm 2 ). The measurement locations were 5 places and represented by the average value. The WC value is the (energy) when the fabric is compressed. The larger the value, the better the towel is compressed, indicating a greater plumpness and softness, and it is good. (3) Evaluation of washing durability of texture The towel fabric was washed 20 times in a washing machine according to JIS L-0217 (1995), method 103. After drying, the compression work amount: WC = (gf.cm 2 ) was measured. The measurement locations were 5 places and represented by the average value. The smaller the difference in WC values before and after washing, the less the decrease in the plump texture due to washing, the more durable it is, and it is good. (4) Evaluation of water drainage property during washing The towel fabric with a width of 35 cm was cut to a length so that it weighed 80 g, and its weight was accurately weighed to one decimal place. This was immersed in water for 20 minutes. Then, the wet towel fabric was taken out and centrifugally dehydrated in the dehydration tank of a washing machine for 4 minutes, and the weight was accurately weighed. The residual moisture rate (%) of the towel fabric was obtained by the following formula. The smaller the value, the better the water drainage property. The better the water drainage property, the faster the subsequent drying speed tends to be. The number of measurements was 3 points and represented by the average value. The residual moisture content of the dough (%) = (Weight of the dough after soaking in water and dewatering (W1)) - (Weight of the dough before soaking in water (W0)) / (Weight of the dough before soaking in water (W0)) × 100 (5) Evaluation of lint shedding properties of towel fabric after washing Lint shedding during washing was measured according to JIS L0217 (1995), Method 103. The lint shedding rate (%) was calculated using the following formula; a smaller value indicates less lint shedding and better quality. The measurement was performed using 5 points, and the average value was used. Lint shedding rate (%) = (Weight of lint shed after washing (g1)) / (Weight of towel before washing (g0)) × 100 (6) Water absorption evaluation (modified Larose method) Five measurements were taken according to the modified Larose method of JIS L 1907 (2010), and the average value was calculated. The Larose index (water absorption index) was calculated according to the following formula. Larose index (water absorption index)=2545V×1411W+79 V: Maximum water absorption rate (ml / s), W: Amount of water absorbed at the point of maximum water absorption rate (ml) A higher value is preferable because it allows the skin to absorb moisture quickly and in large quantities. (7) Water absorption rate (dropping method) The water absorption rate of the terrycloth was evaluated based on the drop method (Veulette method) of JIS L 1907 (2010). The test involved dropping one drop of water onto the terrycloth from a height of 10 cm, measuring the time (in seconds) until the mirror-like surface of the water droplet disappeared, and calculating the average value. A shorter time indicates faster and better water absorption. <Test method for wettability> The water wetting rate, as described in Patent Publication No. 6991633 proposed by the present applicant, is a test method that matches the evaluation of the water absorption rate perceived by people when using textile fabrics such as towels. This is achieved by dropping water droplets onto a test sample of fabric, allowing it to absorb, and then using filter paper to absorb the moisture. The ability of the fabric to retain moisture, i.e., the water wetting rate. A lower water wetting rate indicates greater and superior water absorption of the fabric. (1) Test environment and other conditions The test environment was under standard conditions, with a temperature of 20±4°C and a relative humidity of 65±4%RH. • The filter paper used was stored for at least 24 hours under standard conditions, at a temperature of 20±4°C and a relative humidity of 65±4%RH. • Test samples were stored for at least 24 hours under standard conditions, at a temperature of 20±4°C and a relative humidity of 65±4%RH. The water used for dripping was at a temperature of 20±15℃ (5~35℃). (2) Operating Procedure • Test specimen 1, made of textile towel fabric, measured 10 cm in length and 10 cm in width. Test specimen 1 was placed on a sample stand (not shown in the illustration). The filter paper used was 110 mm in diameter and 0.22 mm thick, made from α-cellulose according to JIS P 3801 Type 1 standard, and its weight was measured. The filter paper used was Advantec Co., Ltd., product name "Circular Qualitative Filter Paper No. 1". 0.8 ml of water was measured into a pipette, dropped onto test sample 1, and allowed to be absorbed by test sample 1 for 5 seconds. A filter paper was placed on top of it, and a load of 1.3 kg (1274 Pa) was applied from above. Wait 5 seconds and then remove the load. The weight of the filter paper after water absorption was measured. (3) Calculation of the water wetting rate It was calculated using the following formula. W = [(BA) / A] × 100 However, W: Water wetting rate (%) A: Weight of the filter paper before measurement (g) B: Weight of the filter paper after water absorption (g) <Pile fluffiness> The pile portion of the towel fabric was observed using an optical microscope by taking side photographs.

[0033] (Example 1) (1) Warp pile yarn Warp pile yarn was produced using the Sirospun spinning machine shown in Figure 1. American Pima extra-long staple cotton was used. The primary twist direction of the two rovings 12a and 12b was set to the Z direction, the twisting direction by the Traveler 21 was set to the S direction, and the yarn was twisted in the untwisting direction. The fineness of the roving was 5g / 6 yards (9113decitex), and the number of twists in the Z direction of the roving was 5 times / inch (twist coefficient K=1 in cotton count equivalent). The speed of the endless friction belt was set to be the same as the winding speed of the twisted yarn (spun yarn 19). The resulting spun yarn was cotton count 16, with 9 twists per inch (twist coefficient K=2.22), and had fine twist irregularities along the longitudinal direction of the yarn. The warp pile yarn underwent its first sizing in a cheese-like state. A starch aqueous solution was used as the sizing agent, and 0.75 g / L of a surfactant containing a higher alcohol was added as a penetrating agent. The yarn was sizing by immersion at 80°C for 30 minutes and dried at 125°C for 30 minutes. The sizing concentration during the first sizing was 0.2% by mass, and the adhesion rate was 0.5% by mass. (2) Warp yarn For the warp yarn, Indian cotton was used as the filling, and a ring-spun 40-count double yarn with a twist coefficient of 3.8 for the undertwist and 2.2 for the toptwist was used. The warp yarn was also sized in a cheese-like state, similar to the warp pile yarn. (3) Weft yarn For the weft yarn, we used Indian cotton padding, specifically a 20-count ring-spun single yarn with a twist coefficient of 4.0. The weft yarn, like the warp pile yarn, was sized in a cheese-like manner. (4) Warping During warping, the yarn underwent a second sizing. The yarn was immersed in a sizing bath at 70°C at a sizing rate of 30 m / min and dried at 140°C for 30 minutes. A starch aqueous solution was used as the sizing component, with 5 g / L of polyethylene oxide (PEO) added as a thickener. The warping speed was 300 m / min, and the tension during warping was 30 cN. The sizing concentration during the second sizing was 2% by mass, and the adhesion rate was 2.1% by mass. (5) Weaving of towel fabric The fabric shown in Figure 2 was woven using a pile loom. The fabric structure is as shown in Figure 3. The loom rotation speed (number of weft threads inserted per minute) was 250 rpm. The warp density was 46 threads / inch, the weft density was 56 threads / 2 inches, and the weight was 423 g / m². 2 The fabric composition was 100% cotton. (6) Scouring and finishing process for towel fabric Next, the raw fabric was descaled in a liquid jet dyeing machine according to the standard method for processing cotton (55°C for 20 minutes, in a bath with amylase and surfactant). Then, it was scouring in the same machine at 98°C for 50 minutes in a bath with dilute caustic soda and alcohol ethoxylate added. Next, the fabric was bleached using a conventional method in a hydrogen peroxide bath at 98°C for 50 minutes. Then, as a softening treatment, it was treated for 20 minutes in a bath with Nikka Silicone AQ166 softener, concentration 3.3% owf, temperature 40°C, pH 4.5. After that, it was set in a tenter at 135°C and finished (off-white finish). The pile length was 1.13 cm.

[0034] (Comparative Example 1) For the warp pile yarn, the primary twist direction of two rovings 12a and 12b was set to the Z direction, and the twisting direction by the traveler 21 was also set to the Z direction. No false twist was applied. Otherwise, the procedure was carried out in the same manner as in Example 1. The resulting spun yarn was cotton count 16 single yarn with a twist coefficient K = 3.2.

[0035] (Comparative Example 2) The warp pile yarn was made by twisting a 16-count cotton single yarn and a 80-count water-soluble vinylon single yarn in the S direction using a twisting machine. During the post-processing stage, the water-soluble vinylon yarn was dissolved, and the warp pile yarn of the towel product was made from untwisted 16-count cotton single yarn. The twist coefficient K of the twisted yarn was set to 4.0. The results are shown in Table 2.

[0036] [Table 2]

[0037] As is clear from Table 2, the pile yarn of the towel fabric in Example 1 had uneven twisting in the length direction of the yarn. This resulted in the following effects. (1) It sheds very little lint. (2) Bulky. (3) It has a large volume and a high degree of fluffiness before washing. (4) The fluffiness is less likely to be lost after washing, and washing deterioration is less likely to occur. (5) It has minimal wetness and provides a comfortable wiping experience. (6) The residual moisture content is low immediately after dehydration. Furthermore, the single fibers are in a migration state, intertwining with each other, with some fibers moving inward and others outward and twisting. As a result, each constituent fiber exists in a free state, which gives the pile good fluffiness, a soft and voluminous texture, and confirms that the towel has high properties such as water absorption, washability, and durability.

[0038] Furthermore, as is clear from the side view of the pile yarn in Example 1 in Figure 4, there are sections 26 with a lot of twist and sections 27 with little twist in the length direction of the yarn, resulting in a voluminous yarn overall. In contrast, Figure 5 is a side view of the pile yarn of Comparative Example 1, which is a tightly packed yarn. Figure 6 is a side view of the pile yarn of Comparative Example 2, in which the water-soluble vinylon yarn 29 has become embedded in the cotton fibers 28, resulting in a distorted yarn that lacks volume.

[0039] Figure 7 is a side view of the towel fabric according to Embodiment 1 of the present invention. This towel fabric is composed of pile yarns 30 and a base fabric 31. The pile yarns 30 are spread apart, intersect once at the base, and stand up almost perpendicularly from the base fabric 31. In other words, it is a one-loop pile. As a result, the pile stands up well, and a soft and voluminous texture is achieved. In contrast, Figure 8 is a side view of the towel fabric of Comparative Example 1, where the pile threads intersect twice, at the base and midway, the loops are tightly woven, and the pile threads are sloped from the base. Figure 9 is a side view of the towel fabric of Comparative Example 2, where the pile threads are even flatter from the root.

[0040] Figure 10 is a plan view of the towel fabric of Embodiment 1 of the present invention. The loops are large enough to be visible, neat and well-aligned, and the fabric surface is good, making it immediately apparent that it is a high-quality towel. Furthermore, because each constituent fiber exists in a free state, the pile has good fluffiness, resulting in a soft and voluminous texture, and high properties such as water absorption, washability, and durability. In contrast, Figure 11 is a plan view of the towel fabric of Comparative Example 1, and it can be seen that the loops are small, fine, and tightly packed. Figure 12 is a plan view of the towel fabric of Comparative Example 2, showing that the loops are disordered and lying flat. [Industrial applicability]

[0041] The towel fabric of the present invention is suitable for use in face towels, bath towels, hand towels, sports towels, bathrobes, towel blankets, and other fabrics, as well as for clothing, socks, rugs, bedding, and more. [Explanation of Symbols]

[0042] 1 Towel fabric 2a, 2b Warp pile yarn 3 Weft yarn 4a, 4b Warp yarn 10. Cyrospan spinning machine 11a, 11b Coarse yarn bobbins 12a,12b roving 13 Trumpet Guide 14 Back Roller 15. Fume hood 16 Aprons 17 Front Roller 18a, 18b Fleece 19. Spun yarn 20 Snell wires 21 rings 22 Traveler 23 bobbins 24 Drive belt 25 Friction belt 26. Parts with many twists 27. Parts with less twist 28 Cotton fibers 29 Water-soluble vinylon yarn 30 pile yarns 31 Ground organization

Claims

1. A spun yarn for loop piles containing cotton fibers, It does not contain water-soluble fibers. The aforementioned spun yarn for loop pile is a single yarn that is either untwisted or loosely twisted. A spun yarn for loop piles characterized by uneven twisting along the length of the yarn.

2. The aforementioned spun yarn for loop pile is the spun yarn for loop pile according to claim 1, wherein the twist coefficient K is 0 to 2.

9. However, the twist coefficient (K) is calculated using the following formula (Equation 1). [Math 1] However, t: number of twists (twists / 25.4 mm), S: cotton count (English cotton count)

3. The spun yarn for loop pile according to claim 1, wherein the cotton fiber is at least one selected from the group consisting of long fibers and extra-long fibers.

4. The loop pile spun yarn according to claim 1, wherein the cotton fibers constituting the loop pile spun yarn are arranged in parallel.

5. The aforementioned spun yarn for loop pile has a portion with a lot of twist and a portion with little twist in the length direction of the yarn, the portion with a lot of twist is thin and the portion with little twist is thick, as described in claim 1.

6. The aforementioned highly twisted portion and less twisted portion are, on average, 0.5 to 10 mm in length, and the spun yarn for loop pile according to claim 5, wherein a single cotton fiber constituting the pile yarn contains both a highly twisted portion and a less twisted portion.

7. A method for manufacturing a loop pile yarn according to any one of claims 1 to 6, A method for manufacturing loop pile yarn, characterized by drafting multiple rovings using a Sirospun spinning machine, twisting them together to produce untwisted or loosely twisted spun yarn singles, and then adding a false twist to impart twist unevenness in the length direction of the yarn before winding.

8. The method for manufacturing spun yarn for loop pile according to claim 7, wherein the false twist is performed by a friction belt.

9. A loop pile towel using the loop pile spun yarn described in any one of claims 1 to 6, This loop pile towel features open threads from the base of the pile yarn upwards, creating a pile that stands almost perpendicular to the base fabric.

10. The loop pile towel according to claim 9, wherein the pile yarns intersect once at the base, forming a single-loop standing pile.

11. The loop pile towel according to claim 9, wherein the surface of the loop pile towel fabric allows the loops of the loop pile spun yarn to be visible.

12. A method for manufacturing a loop pile towel according to any one of claims 9 to 11, The first sizing is performed in the cheese (spool) state, and after warping, the second sizing is performed in the yarn state and reinforced with sizing, with the warping speed set to 500 m / min or less. A method for manufacturing loop pile towels, using a loom rotation speed (number of times the weft thread is inserted per minute) of 200 to 350 rpm.

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