Loop-pile spun yarn, method for manufacturing same, loop-pile towel using same, and method for manufacturing loop-pile towel

Abstract

This loop-pile spun yarn includes cotton fibers but does not include water-soluble fibers. The loop-pile spun yarn is an untwisted or softly-twisted single yarn and has twist unevenness in the longitudinal direction of the yarn. In this manufacturing method, when multiple strands of roving 12a, 12b are subjected to actual twisting by a single traveler 22 in a Siro spinning apparatus 10 to form an untwisted or softly-twisted spun single yarn, temporary twisting is performed by a friction belt 25 on the upstream side of the traveler 22 to impart twist unevenness to the yarn in the longitudinal direction and then the yarn is reeled.

Description

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

[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.

[0002] Traditionally, towel fabrics are basically made by using warp pile yarns, warp yarns, 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 have high fineness. Patent Document 1 proposes using synthetic fiber silospun spun yarn to create a melange yarn for piles. 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 roving yarns, which is either untwisted or loosely twisted.

[0003] Japanese Patent Publication No. 10-088440, Japanese Patent Publication No. 2019-137941, Japanese Patent Publication No. 2019-137942, Japanese Patent No. 7372718

[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.

[0006] One embodiment of the present invention relates to a spun yarn for loop pile made of cotton fibers, which does not contain water-soluble fibers, and the spun yarn for loop pile is a single yarn with no twist or loose twist having a twist coefficient K of 0 to 2.9, and has uneven twist in the length direction of the yarn, with 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. However, the twist coefficient (K) is calculated by the following formula (Equation 1). However, t: number of twists (twists / 25.4 mm), S: cotton count (English cotton count)

[0007] Another embodiment of the present invention relates to a method for manufacturing loop pile yarn, wherein a plurality of rovings are drafted using a Sirospun spinning machine, twisted together to form a single yarn that is either untwisted or loosely twisted, and false twist is applied using a friction belt to impart twist unevenness in the length direction of the yarn before winding.

[0008] A further embodiment of the present invention relates to a loop pile towel using the aforementioned loop pile spun yarn, wherein the pile yarn of the loop pile towel is a single yarn with a twist coefficient K of 0 to 2.9 that is untwisted or loosely twisted and has pile standing up substantially perpendicular to the base 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.

[0010] The loop pile spun yarn of one embodiment 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 in the length direction 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. In addition, the loop pile towel of one embodiment of the present invention has the yarn 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.

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

[0012] The loop pile spun yarn of one embodiment of the present invention contains cotton fibers. Cotton fibers have excellent water absorption and have been commonly used in towel fabrics for a long time. It does not contain water-soluble fibers such as polyvinyl alcohol (PVA). This is because water-soluble fibers are later dissolved in water and discarded, which not only presents a problem of high cost but also environmental pollution. The loop pile spun yarn is a single yarn of silospun spun yarn, and has uneven twisting in the length direction of the yarn. As a result, as described above, the single fibers are in a migration state in which they are twisted inward or outward, resulting in entanglement between fibers, and each constituent fiber exists in a free state, so the pile has good fluffiness, a soft and voluminous texture, and becomes a pile yarn with high properties such as water absorption, washability, and durability.

[0013] Normally, untwisted or loosely twisted yarns have a low twist count, resulting in weak yarn strength and susceptibility to splicing, making them difficult to wind on a ring spinning machine. However, the spun yarn of one embodiment of the present invention has uneven twisting along the length of the yarn, creating a migration state where single fibers are intertwined, either moving inward or outward. This intertwining of fibers results in a strength sufficient to be wound on a ring spinning machine, even without the inclusion of water-soluble fibers. The uneven twisting can be formed by imparting false twist.

[0014] The aforementioned spun yarn for loop pile preferably has a twist coefficient K of 0 to 2.9, more preferably 0.5 to 2.8, and even more preferably 1 to 2.9. However, the twist coefficient (K) is calculated using the following formula (Equation 1). However, t: number of twists (twists / 25.4 mm), S: cotton count (English cotton count) As mentioned above, the untwisted or loosely twisted yarn with uneven twisting has good pile-up properties, a soft and voluminous texture, and becomes a pile yarn with high water absorption, washability, and durability.

[0015] The cotton fiber is preferably selected from the group consisting of long fibers and extra-long fibers. 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 one embodiment of the present invention, the twist kinks 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. Therefore, it has good pile-standing properties and becomes a pile yarn with a soft and voluminous texture.

[0016]

[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] A method for manufacturing loop pile yarn according to one embodiment of the present invention includes the following steps: (1) Silospun spinning process: The silospun spinning process uses a ring spinning machine to twist a plurality of rovings with a traveler to produce a spun yarn. At this time, the twist direction of the plurality of rovings and the twist direction of the plied spun yarn are reversed to produce an untwisted or loosely twisted yarn. Two to three rovings are preferred. (2) False twisting process: A false twisting machine is provided upstream of the traveler that rotates the ring shape of the ring spinning machine, thereby producing an untwisted or loosely twisted spun yarn with uneven twisting. A friction false twisting machine is preferred, more preferably a friction belt, and as an example, there is a false twisting machine using an endless rubber belt. A false twist is applied by the false twisting machine in a direction perpendicular to the plied yarn. In the case of an endless rubber belt false twisting machine, the belt contacts the plied yarn twice, and a false twist of S-twist-Z-twist or Z-twist-S-twist is applied. 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 yarn that has passed through the friction false twisting machine passes through a traveler that rotates in a ring shape and is wound onto a bobbin.

[0019] In one embodiment of the present invention, the loop pile towel has the pile yarns 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] One embodiment of the loop pile towel has the following characteristics: (1) Little lint shedding. (2) High bulkiness. (3) Great fluffiness and softness before washing. (4) The fluffiness is not easily lost after washing, and washing deterioration is not likely to occur. (5) There is little re-wetting, and it has a comfortable wiping feel. (6) The residual moisture content is low immediately after spin-drying. Furthermore, the single fibers are in a migration state where they are intertwined with each other, either inside or outside, and each constituent fiber exists in a free state, resulting in good pile standing, a soft and voluminous texture, and a towel with high properties such as water absorption, washability, and durability.

[0023] A method for manufacturing a loop pile towel according to one embodiment of the present invention includes the following steps. All of these are measures to prevent yarn breakage. (1) Sizing (sizing) process The yarn is sized for the first time in a cheese (spool) state, and after warping, it is sized for the second time in a yarn state and reinforced by sizing. For the first sizing, it is preferable to sizing the yarn in a 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 about 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 count, 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 yarn is beaten in per minute) The loom rotation speed is usually 400 rpm, but it is preferable to set it to 200 to 350 rpm. (4) Post-processing After weaving the towel fabric, bleaching, scouring, dyeing, etc. are performed according to the usual method to make towel fabric.

[0024] A towel according to one embodiment of the present invention is suitable for use as a bath towel, bath towel, face towel, towel handkerchief (towel chief), hand towel, washcloth, hand towel, bath mat, sports towel, beach towel (body towel), 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 250-500 g / m. 2 The thicker fabrics weigh 500-1000 g / m 2 The following is preferred. Note that 100 g / m² is preferred. 2 Those weighing less than 1000g / m² are thin and lack volume, and also weigh less than 1000g / m². 2 Anything exceeding that is too thick and heavy, and none of them are desirable.

[0025] Furthermore, in this invention, cotton is the best in terms of texture, water absorption, moisture absorption, and handling as a towel, but small amounts of linen, rayon, cupro, acetate, or wool may be blended with cotton. Blends with rayon, cupro, or acetate provide moisture absorption, while wool provides heat retention. The woven raw fabric is descaled in a liquid flow dyeing machine according to the cotton processing process, and then scoured 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). Next, following scouring, it is bleached under conventional conditions (98°C, 50 minutes, hydrogen peroxide solution). Then it is dewatered and set in a tenter for finishing (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 with 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 yarns 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 an enlarged view of the ring 21 and the traveler 22. For example, the primary twist direction of the two rovings 12a and 12b is both set to the Z direction, and the twisting direction by the traveler 22 is set to the S direction, twisting in the untwisting direction. Also, 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 of 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 form loop piles while being anchored to the ground structure composed of the weft ground yarn 3 and warp ground yarns 4a, 4b. The obtained 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 three-ply weft towel structure (three-pick terry motion structure). The warp pile yarns cross once every three weft ground yarns. The warp ground yarns G and warp pile yarns P are arranged alternately. The weft yarns 1 to 3 indicate the order. In Figure 3, as 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 the 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 the cotton fibers. Furthermore, as is clear from Figure 4, the yarn as a whole has a voluminous shape.

[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 spread out and raised. In other words, it is a one-loop raised pile. As a result, the pile has good napping properties and a good soft and voluminous texture.

[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.

[0032] Hereinafter, it 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 a soft texture The softness of the texture is represented by the volume per 1 g of the towel fabric and is determined by the bulk height of the following formula. 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 1 m square. The measurement locations were 5 places and represented by their average value. Bulk height (cm 3 / g) = Thickness (mm) / Basis weight (g / m 2 ) × 1000 (2) Evaluation of a plump texture Using a compression measuring instrument: KES-G5 (manufactured by Kato Tech Co., Ltd.) for the towel fabric, it 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 their 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 large plumpness and a high fluffiness, which is good. (3) Evaluation of the washing durability of the 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 at five locations and the average value was used. The smaller the difference in WC value before and after washing, the less the fluffy texture deteriorates after washing, the more durable and good the product is. (4) Evaluation of water drainage during washing A towel fabric with a width of 35 cm was cut to a length of 80 g, and its weight was accurately measured to one decimal place. This was then soaked in water for 20 minutes. After that, the wet towel fabric was removed and centrifuged in the spin-drying tub of a washing machine for 4 minutes, and its weight was accurately measured. The residual moisture content (%) of the towel fabric was calculated using the following formula. The smaller the value, the better the water drainage. The better the water drainage, the faster the subsequent drying speed tends to be. Three measurements were taken and the average value was used. 100 (5) Evaluation of lint shedding properties of towel fabric after washing Lint shedding after washing was measured according to JIS L0217 (1995), method 103. The lint shedding rate (%) is calculated using the following formula, and a smaller value indicates less lint shedding and better performance. Five measurements were taken and the average value was used. Lint shedding rate (%) = (weight of lint shed after washing (g1)) / (weight of towel before washing (g0)) × 100 (6) Evaluation of water absorption (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 time of maximum water absorption rate (ml) A higher value is preferable because it absorbs moisture from the skin quickly and in large quantities. (7) Water Absorption Rate (Dropping Method) The water absorption rate of the towel fabric was evaluated based on the dropping method; Vuelette method of JIS L 1907 (2010). The outline of the test was to drop one drop of water onto the towel fabric from a height of 10 cm, measure the water absorption time (seconds) until the mirror surface of the water droplet disappeared three times, and calculate the average value. A shorter time indicates faster and better water absorption.<Test Method for Water Wetting Rate> The water wetting rate is described in Patent Publication No. 6991633, proposed by the present applicant. This test method involves dropping water droplets onto a fabric test sample, allowing them to be absorbed, and then using filter paper to absorb the moisture. The property of the fabric in retaining the moisture, i.e., the water wetting rate, is evaluated and matches the evaluation of the water absorbency perceived by people when using textile fabrics such as towels. The lower the water wetting rate, the greater and superior the water absorbency 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 had been stored for 24 hours or more under standard conditions, with a temperature of 20±4°C and a relative humidity of 65±4%RH. - The test sample used had been stored for 24 hours or more under standard conditions, with a temperature of 20±4°C and a relative humidity of 65±4%RH. - The water used for dropping was at a temperature of 20±15°C (5-35°C). (2) Operating Procedure - The size of test sample 1 of the textile towel fabric was 10 cm in length and 10 cm in width. Test sample 1 was placed on a sample stand (not shown in the figure). - Filter paper made from α-cellulose conforming to JIS P 3801 Type 1 standard, with a diameter of 110 mm and a thickness of 0.22 mm, was used, and the weight of the filter paper 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 in a pipette and dropped onto test sample 1, and it was left for 5 seconds to allow the water to be absorbed by the test sample 1. - The filter paper was placed on top, and a load of 1.3 kg (1274 Pa) was placed on top of it. - The load was removed after waiting for 5 seconds. - The weight of the filter paper after water absorption was measured. (3) Calculation of Water Wetting Rate The rate was calculated using the following formula. W = [(B - A) / A] × 100 where W: Water wetting rate (%) A: Weight of filter paper before measurement (g) B: Weight of filter paper after water absorption (g) <Pile fluffiness> Observed by taking a side photograph of the pile portion of the towel fabric with an optical microscope.

[0033] (Example 1) (1) Warp pile yarn A 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, and the twisting direction by the Traveler 21 was set to the S direction, and twisted in the untwisting direction. The fineness of the roving was 5 g / 6 yards (9113 decitex), 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 the same as the winding speed of the plied yarn (spun yarn 19). The obtained spun yarn had a cotton count of 16, a number of twists of 9 times / inch (twist coefficient K = 2.22), and there were fine twist irregularities in the longitudinal direction of the yarn. This warp pile yarn was sized for the first time in a cheese state. A starch aqueous solution was used as the sizing component, 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 mass%, and the adhesion rate was 0.5 mass%. (2) Warp yarns Indian cotton was used as the warp yarn, and a ring-spun 40 count double yarn with a twist coefficient of 3.8 for the undertwist and 2.2 for the overtwist was used. The warp yarns were also sized in a cheese state, similar to the warp pile yarns. (3) Weft yarns Indian cotton was used as the weft yarn, and a ring-spun 20 count single yarn with a twist coefficient of 4.0 was used. The weft yarns were also sized in a cheese state, similar to the warp pile yarns. (4) Warping A second sizing was performed on the yarn during warping. The fabric was immersed in a sizing bath at 70°C at a sizing speed of 30 m / min and dried at 140°C for 30 minutes. An aqueous starch 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 mass%, and the adhesion rate was 2.1 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 basis weight was 423 g / m 2The fabric composition was 100% cotton. (6) Scouring and finishing of towel fabric Next, the raw fabric was descaled in a liquid flow dyeing machine according to the usual method, in accordance with the processing of cotton (55°C x 20 minutes, bath with amylase and surfactant added). Next, it was scoured in the same machine at 98°C for a holding time of 50 minutes in a bath with dilute caustic soda and alcohol ethoxylate added. Next, it was bleached in a hydrogen peroxide bath at 98°C for a holding time of 50 minutes according to the usual method. Next, as a softening treatment, it was treated for 20 minutes in a bath with softener: Nikka Silicon AQ166, concentration 3.3% owf, temperature 40°C, pH 4.5. After that, it was set in a tenter at a temperature of 135°C and finished (off-white finish). The pile length was 1.13 cm.

[0034] (Comparative Example 1) As warp pile yarns, 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 obtained 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 cotton count 16 single yarn and a water-soluble vinylon yarn 80 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 of untwisted cotton count 16 single yarn. The twist coefficient K of the twisted yarn was set to 4.0. The results are shown in Table 2.

[0036]

[0037] As is clear from Table 2, the pile yarn of the towel fabric of Example 1 had twist marks in the length direction of the yarn. As a result, the following effects were confirmed. (1) There is little fiber fly. (2) It is voluminous. (3) It has a large swelling and soft feeling before washing. (4) The swelling is hardly impaired after washing, and washing deterioration hardly occurs. (5) There is little rewetting, and it has a comfortable wiping feeling. (6) The residual moisture rate immediately after dehydration is low. Also, the single fibers are in a migration state where they enter or exit the outside and are twisted, there is entanglement between the fibers, and each constituent fiber exists in a free state. Therefore, it was confirmed that the towel has good pile erectability, a soft and bulging texture, and high properties such as water absorption, washability, and durability.

[0038] Also, as is clear from the side photograph of the pile yarn of Example 1 in Fig. 4, there are a portion 26 with a lot of twist and a portion 27 with little twist in the length direction of the yarn, and the yarn is voluminous as a whole. In contrast, Fig. 5 is a side photograph of the pile yarn of Comparative Example 1, and the yarn is tightened. Fig. 6 is a side photograph of the pile yarn of Comparative Example 2, and the water-soluble vinylon yarn 29 has bitten into the cotton fiber 28 and the yarn is distorted, and the yarn has no swelling.

[0039] Fig. 7 is a side photograph of the towel fabric of Example 1 of the present invention. This towel fabric is composed of a pile yarn 30 and a ground weave 31. The pile yarn 30 is open, intersects once at the root, and stands upright from the ground weave 31 in a substantially vertical direction. That is, it is a one-loop upright pile. As a result, it can be seen that the pile has good erectability and a soft and bulging texture. In contrast, Fig. 8 is a side photograph of the towel fabric of Comparative Example 1, the pile yarn intersects twice at the root and in the middle, the loop part is tightened, and the pile yarn is inclined from the root. Fig. 9 is a side photograph of the towel fabric of Comparative Example 2, and the pile yarn lies down more from the root.

[0040] Figure 10 is a plan photograph of the towel fabric of Example 1 of the present invention. The loops are swollen large enough to be visually recognized, neat, and the loops are neatly arranged. The fabric surface is good, and it can be judged that it is a high-quality towel at first glance. Further, since each constituent fiber exists in a free state, the pile has good standing property, is soft and has a bulging texture, and has high properties such as water absorption, washing resistance, durability, etc. On the other hand, Figure 11 is a plan photograph of the towel fabric of Comparative Example 1, and it can be seen that the loops are small and fine and tightened. Figure 12 is a plan photograph of the towel fabric of Comparative Example 2, and it can be seen that the loops are disordered and lying down.

[0041] The towel fabric of one embodiment of the present invention is also suitable for fabrics such as face towels, bath towels, towel handkerchiefs, sports towels, bathrobes, towel blankets, etc., clothing, socks, carpets, bedding, etc.

[0042] 1 Towel fabric 2a, 2b Warp pile yarns 3 Weft ground yarn 4a, 4b Warp ground yarns 10 Sirospun spinning device 11a, 11b Coarse yarn bobbins 12a, 12b Coarse yarns 13 Trumpet guide 14 Back roller 15 Draft device 16 Apron 17 Front roller 18a, 18b Fleece 19 Spun yarn 20 Snell wire 21 Ring 22 Traveler 23 Bobbin 24 Drive belt 25 Friction belt 26 Part with many twists 27 Part with few twists 28 Cotton fiber 29 Water-soluble vinylon yarn 30 Pile yarn 31 Ground weave

Claims

1. A spun yarn for loop pile made of cotton fibers, which does not contain water-soluble fibers, wherein the spun yarn for loop pile is a single yarn with no twist or loose twist and a twist coefficient K of 0 to 2.9, characterized by uneven twisting in the length direction of the yarn, with parts that are more twisted and parts that are less twisted in the length direction of the yarn, where the parts that are more twisted are thinner and the parts that are less twisted are thicker. However, the twist coefficient (K) is calculated by the following formula (Equation 1). However, t: number of twists (twists / 25.4 mm), S: cotton count (English cotton count) 2. 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.

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

4. The spun yarn for loop pile according to claim 1, wherein the portion with a lot of twist and the portion with little twist each have an average length of 0.5 to 10 mm, and a single cotton fiber constituting the pile yarn contains both a portion with a lot of twist and a portion with little twist.

5. A method for manufacturing a spun yarn for loop piles according to any one of claims 1 to 4, characterized in that when drafting a plurality of rovings with a Sirospun spinning machine and twisting them together to make a single spun yarn that is neither twisted nor loosely twisted, false twisting is applied by a friction belt to impart twist unevenness in the length direction of the yarn and then winding it up.

6. A loop pile towel using the loop pile spun yarn described in any one of claims 1 to 4, wherein the pile yarn of the loop pile towel is a single yarn with no twist or loose twist having a twist coefficient K of 0 to 2.9, and the pile is raised in a direction substantially perpendicular to the base fabric.

7. The loop pile towel according to claim 6, wherein the pile yarns intersect once at the base, forming a single-loop standing pile.

8. The loop pile towel according to claim 6, wherein the surface of the loop pile towel allows the loops of the loop pile spun yarn to be visible.

9. A method for manufacturing a loop pile towel using the loop pile spun yarn described in any one of claims 1 to 4, comprising: first sizing in the cheese (wound yarn) state, second sizing in the yarn state after warping and sizing reinforcement, warping speed of 500 m / min or less, and loom rotation speed (number of times the weft yarn is beaten per minute) of 200 to 350 rpm to manufacture the loop pile towel.

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