JP2016040417A - Covered elastic yarn and hosiery product including the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a covered elastic yarn for providing a hosiery product which does not cause a blood circulation disorder during being worn, does not leave traces after being taken off and is hard to be slipped off during being worn, without impairing attach-ability/detach-ability and a fit feeling.SOLUTION: The covered elastic yarn is a covering yarn formed by arranging a polyurethane elastic yarn having a fineness of 400 dtex-1240 dtex as a core yarn and arranging a non-elastic yarn as a sheath yarn. When a fineness of the polyurethane elastic yarn is denoted as A and a fineness of the non-elastic yarn is denoted as B, A/B is 15-80.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a coated elastic yarn in which an elastic yarn that is a core yarn is coated with a coated yarn that is a non-elastic yarn, and an undercarriage product such as a sock using the coated elastic yarn.

It is desirable that undercarriage products such as socks are difficult to slip off, are not excessively tightened, fit the foot, and can be worn naturally.
In general, when socks are worn, a phenomenon in which the socks fall off compared to the initial wear is often seen in daily operations. One of the factors that cause the socks to fall off is a lack of support. Therefore, as a method for strengthening the support force and preventing slippage, a method of inserting a rubber thread into a mouth rubber part of a sock has been conventionally performed. However, this method is not desirable because the tightening force during wearing is increased, leading to discomfort and even blood circulation disorders due to excessive tightening. Furthermore, since the area of contact between the rubber thread and the skin surface is small only by insertion, a sufficient friction area cannot be obtained, and a sufficient effect is not obtained in terms of improving the frictional force between the skin and the socks. In addition, there is a problem that traces of socks remain after undressing.

For this reason, as a method of improving the above-mentioned slipping off, a sock having a non-slip property has been proposed by arranging a portion having a high frictional resistance on the mouth rubber portion and contacting the skin without increasing the tightening force. (See Patent Documents 1 and 2 below).
The above socks prevent slip-off by forming a slip-prevention layer with heat-curing or room-temperature-curing silicone rubber on the mouth rubber part, or by increasing the frictional force of the part where the skin contacts the sock by penetrating a high-friction paint. An effect can be imparted. These socks are different from prevention of slipping off by increasing the wearing pressure, and blood circulation troubles are prevented during wearing, and there is no trace after undressing, but high friction paint penetrates the fabric or silicone rubber is used. By using it and forming the slip-off preventing layer, a portion having a low fabric elongation is formed in the mouth rubber portion. By disposing a portion having a low fabric elongation in the mouth rubber part, the degree of elongation as a whole of the mouth rubber part is lowered. For this reason, at the time of attaching and detaching, when the sock is stretched, the fabric is not easily stretched, which causes a problem that it is difficult to wear. Moreover, since the return of the fabric is worse than when no slip-off prevention layer is formed, there are a number of problems that the fit is not good and sufficient wearing pressure cannot be obtained.

JP 2002-180302 A JP 2004-360151 A

  The present invention relates to a coated elastic yarn suitable for the production of undercarriage products such as hosiery, which does not impair attachment / detachment and fit, does not cause blood circulation during wearing, does not form a trace after undressing, and is difficult to slip off, and this coating The purpose is to provide undercarriage products such as socks in which elastic yarn is knitted into the rubber band.

The inventors of the present invention can increase the coefficient of friction of the coated elastic yarn by coating the non-elastic yarn of fine fineness on the elastic yarn of a fine fineness having a specific fineness, and the above object can be achieved. As a result, the present invention has been completed. That is, the present invention provides the following inventions.
(1) A covering yarn in which a polyurethane elastic yarn having a fineness of 400 dtex to 1240 dtex is arranged on the core yarn and an inelastic yarn is arranged on the sheath yarn. The fineness of the polyurethane elastic yarn is A and the fineness of the inelastic yarn is B. A coated elastic yarn, wherein A / B is 15-80.
(2) The coated elastic yarn according to item 1, wherein the number of twists of the inelastic yarn is 100 to 500 T / m.
(3) The length of the elastic yarn when the inelastic yarn coated from the polyurethane elastic yarn is untwisted to make the elastic yarn and the inelastic yarn slack. 3. The coated elastic yarn according to 1 or 2 above, wherein 1.0 ≦ D / C ≦ 1.7 when the length is D.
(4) The coated elastic yarn according to any one of (1) to (3) above, wherein the polyurethane elastic yarn contains a polyalkylene ether diol having a side chain as a diol component.
(5) The coated elastic yarn as described in (4) above, wherein at least a part of the side chains have two methyl groups as side chains on the same carbon.
(6) An undercarriage product characterized in that the coated elastic yarn according to any one of the above items 1 to 5 is knitted in the vicinity of an opening or in a mouth rubber part.
(7) The undercarriage product according to the above item 6, wherein the undercarriage product is a sock.
(8) The sock as described in (7) above, wherein the pull-out strength of the mouth rubber part is 3300 to 6000 cN.

  Since the coated elastic yarn of the present invention has a high coefficient of friction, it can be imparted with a sufficient anti-slip effect without impairing detachability and wearing feeling by being knitted into an undersole product such as socks as a non-slip. Suspension products such as socks that do not easily fall off can be provided.

It is a figure which shows the general appearance of a general sock. It is a figure which shows the outline | summary of the drawing tester used for drawing strength measurement.

Hereinafter, the present invention will be described in detail.
In the coated elastic yarn of the present invention, it is possible to increase the exposed area of the elastic yarn to be coated by coating the non-elastic yarn of fine fineness on the elastic yarn of fine fineness under predetermined conditions. As a result, the friction coefficient of the coated elastic yarn can be increased, and a sufficient anti-slip effect can be obtained when knitted into an undercarriage product such as a sock. In addition, by using a predetermined yarn as the elastic yarn, it is possible to obtain a sufficient contact pressure and anti-slip effect without impairing conventional detachability. Further, by using the knitting machine and knitting the covered elastic yarn into the mouth rubber part of the sock, it becomes possible to knitting a portion having a high frictional force.

  Causes of slipping off the sock include its own weight on the sock, changes in frictional resistance due to changes in the shape of the circumference due to contraction of the muscles, tensile force due to repeated stretching of the sock body fabric due to movement of the feet and ankles It is conceivable that the displacement caused by the three combined factors exceeds the support force of the socks so that the displacement occurs. The sock support force here is considered to be a combination of a circumferential tightening force, which is generally applied pressure, a frictional force between the foot and the sock, and the sock shape retention.

  In general, in order to increase the support force, a method of increasing the tightening force in the circumferential direction by inserting a rubber thread into the rubber band portion or increasing the fineness of the rubber thread can be considered. However, although this increases support power, problems such as excessive blood flow resulting in impaired blood circulation, a feeling of pressure during wearing, and a mark on the foot during undressing occur.

As another method, there is a method of increasing the frictional force between the foot and the sock in order to increase the support force. As this method, a method of increasing the frictional force between skin and socks by applying and penetrating high friction paint or silicone rubber to the mouth rubber part and arranging a part with high frictional force is common. By applying and penetrating friction paint, silicone rubber, etc. to the mouth rubber part, the fabric elongation of the predetermined part will decrease, and when stretching the sock when attaching and detaching, it is difficult to attach and detach, Problems arise.
In addition, since the return of the fabric is worse than that of the body fabric, there are not a few problems such as a poor fit and a lack of sufficient pressure.

  Based on the above, the present inventors have knitted the coated elastic yarn created under the predetermined coating conditions as a non-slip into the mouth rubber part of a product such as a sock, so that a sufficient anti-slip effect is obtained without impairing detachability. It was found that can be imparted.

  The undercarriage product to be knitted with the coated elastic yarn of the present invention refers to a product worn on a foot such as socks, tights and leggings. In these undercarriage products, by knitting the coated elastic yarn of the present invention in the vicinity of the opening portion near the body of the body when worn, it is possible to provide a sufficient anti-slip effect without impairing detachability. I found out that I can do it.

  The coated elastic yarn of the present invention is a covering yarn in which a polyurethane elastic yarn having a fineness of 400 dtex to 1240 dtex is arranged in the core yarn and an inelastic yarn is arranged in the sheath yarn, and the fineness of the polyurethane elastic yarn is set to A. A coated elastic yarn, wherein A / B is 15 to 80, when the fineness of the yarn is B. Further, the number of twists of the non-elastic yarn of the sheath yarn is 100 to 500 T / m, the non-elastic yarn coated from the polyurethane elastic yarn as the core yarn is untwisted, and the elastic yarn and the non-elastic yarn are slackened. Covered elasticity created under the covering conditions of 1.0 ≦ D / C ≦ 1.7, where C is the length of the elastic yarn when not in use and D is the length of the non-elastic yarn A yarn is preferred.

  In the present invention, it is essential that the fineness of the polyurethane elastic yarn as the core yarn is 400 dtex to 1240 dtex, and preferably 450 dtex to 1000 dtex. When the fineness of the polyurethane elastic yarn is less than 400 dtex, when it is covered with the non-elastic yarn, the exposed area of the exposed polyurethane elastic fiber is small, so the area touching the skin becomes small. Thereby, since sufficient frictional force cannot be obtained with respect to the slippage, a sufficient slippage suppression effect cannot be obtained. In addition, when the fineness of the polyurethane elastic yarn exceeds 1240 dtex, the fineness of the polyurethane elastic yarn becomes too thick. Therefore, when the yarn is made into a covered elastic yarn and then knitted into a sock or the like, The power of the body becomes too strong, but the tightening force is increased and the support force is increased. However, excessive tightening may lead to blood circulation problems, a feeling of pressure when worn, and a mark on the foot when undressed. .

In the coated elastic yarn of the present invention, when the fineness of the polyurethane elastic yarn is A and the fineness of the inelastic yarn is B, it is important that A / B is 15 to 80, and desirably A / B is 25-80.
When the fineness ratio A / B is less than 15, the polyurethane elastic yarn, which is the core yarn, has a small exposed area, so that the area touching the skin is small. Thereby, since sufficient frictional force cannot be obtained with respect to the slippage, a sufficient slippage suppression effect cannot be obtained. Further, if A / B exceeds 80, the exposed area of the elastic yarn becomes too large, and the operability becomes poor when knitting into socks and the like, and glare or the like appears when knitting into socks and the like. This leads to a decline in aesthetics.

  In the coated elastic yarn of the present invention, the number of twists of the non-elastic yarn of the sheath yarn is preferably 100 to 500 T / m. When the number of twists of the non-elastic yarn of the sheath yarn exceeds 500 T / m, the exposed area of the polyurethane elastic yarn, which is the core yarn, is small, so that the area touching the skin is small. Thereby, since sufficient frictional force cannot be obtained with respect to the slippage, a sufficient slippage suppression effect cannot be obtained. On the other hand, when the twist number is less than 100 T / m, the inelastic yarn is separated from the elastic yarn, resulting in poor operability.

  The coated elastic yarn of the present invention is a length of the elastic yarn when the non-elastic yarn coated from the polyurethane elastic yarn which is the core yarn is untwisted so that the elastic yarn and the non-elastic yarn are not slackened. Is C, and the length of the inelastic yarn is D, it is desirable that 1.0 ≦ D / C ≦ 1.7. When D / C exceeds 1.7, when knitted into socks or the like, there is a problem that the power of the coated elastic yarn is strong, the detachability is deteriorated, and the tightening force is increased. When D / C is less than 1.0, it is necessary to stretch and coat the non-elastic yarn when producing the coated elastic yarn, and the operability of the coating process is significantly reduced.

  Moreover, it is desirable that the friction coefficient in the length direction of the sock at the portion where the coated elastic yarn of the present invention is knitted into the sock is 0.45 to 0.70. More desirably, it is 0.50 to 0.65. When the friction coefficient is less than 0.45, since the frictional force with the skin is low, a sufficient slip prevention effect cannot be expected. Moreover, when a friction coefficient exceeds 0.70, since friction with skin will generate | occur | produce excessively and it will feel stickiness at the time of wear, a feeling of wear will fall.

  Further, after the coated elastic yarn of the present invention is knitted into a sock, it is desirable that the pullout strength is 3300 cN to 6000 cN in a pullout test described later using the sock. More desirably, it is 3700 cN to 6000 cN. The pull-out strength indicates the support force of the socks. In this case, the support force is considered to be a combined force of a friction force and a circumferential tightening force. When the pull-out strength is less than 3300 cN, the support force for the pulling force is insufficient, so that a sufficient effect for preventing the slip-off cannot be expected. Further, when the pull-out strength exceeds 6000 cN, the tightening force in the socks becomes excessive, resulting in a blood circulation disorder, a feeling of pressure when worn, and a mark remaining on the foot when undressed.

As the polyurethane elastic yarn that can be used as the core yarn of the coated elastic yarn of the present invention, those obtained by dry spinning or melt spinning can be used. The elongation at break of the polyurethane elastic yarn is preferably 400 to 1000% in order to have good stretchability when knitted in socks or the like.
The polymer used for the polyurethane elastic yarn is not particularly limited, but preferably contains a polyalkylene ether diol having a side chain as a diol component. Examples of the polyalkylene ether diol having a side chain include a polyalkylene ether diol having two methyl groups as side chains on the same carbon and a polyalkylene ether diol having one methyl group as side chains. However, these polyalkylene ether diols are not limited, and it is sufficient that at least a part of the diol component contains a polyalkylene ether diol having a side chain.
A polyurethane elastic yarn containing a polyalkylene ether diol having a side chain as a diol component is preferred because the side chain component becomes a steric hindrance during polymerization, crystallization of the polymer is suppressed, and soft stretch properties are exhibited.
Here, the side chain in the polyalkylene ether diol is preferably a methyl group among the side chains. When the side chain has an ethyl group or longer, the side chain becomes undesired steric hindrance, and the crystallization of the polymer is difficult to proceed excessively. For this reason, since sufficient crystallinity cannot be obtained, it becomes a thread with a low modulus and poor recoverability.

  In addition, the polyurethane elastic yarn used in the present invention is usually added to a compound that is usually added, for example, an ultraviolet absorber, an antioxidant, a light stabilizer, a gas anti-coloring agent, a chlorine-resistant agent, a coloring agent, a matting agent, and a lubricant. In addition, a filler or the like may be added.

  Examples of the non-elastic yarn that is a coated yarn in the coated elastic yarn of the present invention include polyamide fibers, polyester fibers (polytrimethylene terephthalate, etc.), polypropylene fibers, acrylic fibers and other synthetic fibers, cupra, rayon, cotton, bamboo Any fiber can be used, such as cellulosic fibers such as fibers and animal fibers such as wool. Bright yarns, semi-dal yarns, full-dal yarns and the like formed from these materials can be arbitrarily used. As the cross-sectional shape of the inelastic fiber, any cross-sectional shape such as a round shape, an oval shape, a W shape, a saddle shape, and a hollow fiber is possible. In addition, the form of the inelastic fiber is not particularly limited, and a crimped yarn subjected to raw yarn, false twist, or the like can be used. Further, it can be used as a composite yarn obtained by mixing long fibers, spun yarn, two or more kinds of fibers by twisting, covering, air blending, or the like.

  Examples of the knitting structure such as socks in which the coated elastic yarn of the present invention is knitted into the mouth rubber portion or the like include flat knitting, intarsia knitting, rubber knitting, lynx, jacquard and the like, and are not particularly limited.

  As the sock knitting machine, a single cylinder knitting machine, a double cylinder knitting machine, a flat knitting machine or the like can be used, and is not particularly limited.

  EXAMPLES Hereinafter, although this invention is demonstrated concretely based on an Example, this invention is not limited only to these Examples. In addition, the evaluation in an Example was performed with the following method.

(1) Measurement of fineness of non-elastic yarn and elastic yarn of coated elastic yarn After untwisting a certain length of coated elastic yarn extracted from the knitted fabric and dividing it into elastic yarn and non-elastic yarn, elastic yarn and non-elastic yarn The length and weight of the elastic yarn were measured, and the fineness (dtex) was calculated by calculation.

(2) Measurement of the length ratio of the inelastic yarn to the elastic yarn of the coated elastic yarn Unwind the coated elastic yarn of a certain length extracted from the knitted fabric, divide it into an elastic yarn and an inelastic yarn, Apply a load of 0.001 times the fineness (dtex) to the yarn and 0.1 times the fineness (dtex) to the inelastic yarn, hold the unloaded side, suspend the yarn in the air, and sag Make the state without. Thereafter, the length (Ccm) of the elastic yarn and the length (Dcm) of the inelastic yarn were measured. Thereafter, the length ratio D / C between the inelastic yarn and the elastic yarn in the coated elastic yarn was calculated.

(3) Measurement of twist number of inelastic yarn The weight and length of the coated elastic yarn were measured, and the fineness (dtex) of the coated elastic yarn was calculated. Thereafter, using a combustor (manufactured by Asano Machinery Manufacturing Co., Ltd.), a load of 0.45 times the fineness (dtex) is applied to the end of the coated elastic yarn, and untwisting is performed in a state where sagging is eliminated. The number of twists (T (times) / m) was calculated from the length (cm) of the inelastic yarn obtained by burning and the number of twists (times) at the end of deflaming.

(4) Measurement of the friction coefficient of the sock mouth rubber part The friction coefficient of the sock mouth rubber part was measured by creating a coated elastic yarn and then knitting the sock mouth rubber part with a knitting machine to create a region with high frictional force. After that, using a KES-SE-STP friction tester (manufactured by Kato Tech Co., Ltd.), artificial leather (DEATEX JAPAN Co., Ltd.) was applied to the friction surface of a 1.0 cm × 1.0 cm friction element and the load was applied. Under the conditions of 50 g, speed of 1 mm / sec, and moving distance of 4 cm, the frictional force in the length direction of the sock in the region of high sock frictional force was measured. In addition, in order to express the frictional force at the time of wearing socks, it measured in the state which extended socks in the circumferential direction so that the circumference of the mouth rubber part of socks might be set to 32 cm. Moreover, the measurement was performed 3 times and the average value was used.

(5) Measurement of the pull-out strength of the sock mouth rubber part Fig. 2 shows an outline of a pull-out tester used for measuring the pull-out strength of the sock mouth rubber part. Artificial leather (DEATEX JAPAN Co., Ltd.) is wrapped around a 500 mL poly container 7 (manufactured by AS ONE Co., Ltd. (mouth inner diameter × body inner diameter × total height = φ43.5 mm × φ78.5 mm × φ155 mm)) A tube simulating the foot was created. Then, with the mouth of the plastic container 7 down, a hole with a diameter of about 5 mm is opened in the mouth at two places, and a constant speed extension type tensile tester (RTG-1210: manufactured by A & D Corporation) is used. The lower cell 6 was fixed with a binding band 8. Thereafter, a mark having a diameter of 1.5 cm was marked from the bottom of the plastic container at the position of 14.5 cm, and the position was designated as a marking point 9.
The pull-out strength is measured by using the above-mentioned pull-out tester, chucking the toe of the sock on the upper cell 10 of the constant-speed extension type tensile tester, and then the end (opening) of the socks rubber part 1 Socks were put on a plastic container simulating a foot so as to be positioned at the center of the marking point 9. Thereafter, the distance between the upper and lower cells of the constant-speed extension type tensile tester was changed so that the sock did not sag and no tension was applied to the sock to obtain an initial length.
Then, constant-speed extension was performed at an initial load of 0.1 mN and a pulling speed of 300 mm / min, and the point at which the load was maximized was defined as the pullout strength. Moreover, the measurement was performed 3 times and the average value was used.

(6) Deviation measurement method (walking test)
For measurement, after wearing socks on both feet, marking was performed on each foot in the front, back, left, and right at the upper end of the mouth rubber part. Then, after wearing sneakers (Σtef100, manufactured by Moon Star Co., Ltd.) that fits the size of the foot, we walked on the treadmill for 10 minutes at a speed of 4.0 km / h and a walking pace of 110 steps / minute. . Then, from the point marked before walking to the position of the upper end of the rubber band of the sock being worn was measured with 8 points on both feet, and the average value of these 8 points was taken as the amount of slippage of the sock.

(7) Computation of the amount of deviation compared with Comparative Example 1 In order to check the effect of suppressing the deviation against Comparative Example 1, which is a sock in which the coated elastic yarn is not knitted in the mouth rubber part, the following example shows the amount of deviation compared with Comparative Example 1. The amount of drop was calculated.
Amount of deviation drop [%] compared to Comparative Example 1 = (Amount of deviation in socks in each Example and Comparative Example (cm) / Amount of deviation in socks of Comparative Example 1 (cm)) × 100
In the above formula, the smaller the value of the deviation drop amount [%] compared to Comparative Example 1, the lower the deviation drop amount compared to Comparative Example 1, which indicates that the deviation drop effect is high. .

(8) Detachment feeling Socks obtained in the following examples and comparative examples were worn by each panel. After performing the deviation amount measuring method (6) above, a questionnaire survey was conducted. The questionnaire was evaluated for ease of attachment / detachment and was evaluated according to the following evaluation criteria. The evaluation in Comparative Example 1 was set to 3, and Examples 1-8 and Comparative Examples 2-4 were compared and evaluated.
5: Very easy to put on and take off 4: Easy to put on and take off 3: Not easy to put on or take off (equivalent to Comparative Example 1)
2: Slightly difficult to put on and take off 1: Hard to put on and take off

(9) Tightening feeling Socks obtained in the following examples and comparative examples were worn by each panel. After performing the deviation amount measuring method (6) above, a questionnaire survey was conducted. The questionnaire evaluated the feeling of tightening when worn and was evaluated according to the following evaluation criteria. The evaluation in Comparative Example 1 was set to 3, and Examples 1-8 and Comparative Examples 2-4 were compared and evaluated.
5: Tightening feels very strong 4: Tightening feels somewhat strong 3: Tightening is neither strong nor weak (equivalent to Comparative Example 1)
2: Feels slightly tightened 1: Feels weakly tightened

[Comparative Example 1]
A single-cylinder sock knitting machine with a 3.75 inch hook diameter and 144 needles that can be arbitrarily changed at the same yarn feeder, is made up of 70% cotton fiber and 30% acrylic fiber 32 The plain knitted socks shown in FIG. 1 were prepared using the blended yarn of the count as the front yarn and FTY made of 44 dt polyurethane elastic yarn and 78 dt nylon yarn as the back yarn. Nothing was knitted into the rubber band 1. As a result of conducting a pull-out test using the produced socks, the pull-out strength was 2714 cN. Table 1 shows the physical property measurement results and the wear test results of the obtained socks.

[Example 1]
A polyurethane elastic yarn of 620 dt / 72f containing a polyalkylene ether diol having two methyl groups as side chains on the same carbon as the diol component is used as a core yarn, and a 13 dt / 7f polyamide fiber is used as a covering yarn. Then, the polyurethane elastic yarn was coated at a twist number of 300 T / m to obtain a covering yarn. The length of the elastic yarn when the non-elastic yarn coated from the polyurethane elastic yarn as the core yarn is untwisted and the elastic yarn and the non-elastic yarn are left in a slack state in the covering yarn after preparation. Is C and D / C is 1.41 where D is the length of the inelastic yarn. Table 1 shows the physical properties of the obtained coated elastic yarn.
A sock was produced in the same manner as in Comparative Example 1 except that the covered elastic yarn obtained on the surface in contact with the skin in a range of 4.0 cm in length was knitted into the mouth rubber part of the sock. As a result of conducting a pull-out test using the produced socks, the pull-out strength was 4274 cN. Table 1 shows the physical property measurement results and the wear test results of the obtained socks.

[Example 2]
A 470 dt / 72 f polyurethane elastic yarn containing a polyalkylene ether diol having two methyl groups as side chains on the same carbon as the diol component is used as the core yarn, and a 22 dt / 20 f polyamide fiber is used as the covering yarn. Then, the polyurethane elastic yarn was coated at a twist number of 300 T / m to obtain a covering yarn. The length of the elastic yarn when the non-elastic yarn coated from the polyurethane elastic yarn as the core yarn is untwisted and the elastic yarn and the non-elastic yarn are left in a slack state in the covering yarn after preparation. Is C, and the length of the inelastic yarn is D, D / C is 1.36. Table 1 shows the physical properties of the obtained coated elastic yarn.
A sock was produced in the same manner as in Comparative Example 1 except that the covered elastic yarn obtained on the surface in contact with the skin in a range of 4.0 cm in length was knitted into the mouth rubber part of the sock. As a result of a pull-out test using the produced socks, the pull-out strength was 3655 cN. Table 1 shows the physical property measurement results and the wear test results of the obtained socks.

[Example 3]
As the diol component, a polyurethane elastic yarn of 620 dt / 72f containing a polyalkylene ether diol having one methyl group as a side chain is used as a core yarn, and a polyamide yarn of 13 dt / 7f is used as a covering yarn. Was covered with a polyurethane elastic yarn at 300 T / m to obtain a covering yarn. The length of the elastic yarn when the non-elastic yarn coated from the polyurethane elastic yarn as the core yarn is untwisted and the elastic yarn and the non-elastic yarn are left in a slack state in the covering yarn after preparation. Was C, and the length of the inelastic yarn was D, D / C was 1.37. Table 1 shows the physical properties of the obtained coated elastic yarn.
A sock was produced in the same manner as in Comparative Example 1 except that the covered elastic yarn obtained on the surface in contact with the skin in a range of 4.0 cm in length was knitted into the mouth rubber part of the sock. As a result of conducting a pull-out test using the produced socks, the pull-out strength was 4052 cN. Table 1 shows the physical property measurement results and the wear test results of the obtained socks.

[Example 4]
A polyurethane elastic yarn of 620 dt / 72f having PTMG as the main chain is used as the core yarn, a polyamide fiber of 13 dt / 7f is used as the covering yarn, and the polyurethane elastic yarn is coated at a twist number of 300 T / m. A covering yarn was obtained. The length of the elastic yarn when the non-elastic yarn coated from the polyurethane elastic yarn as the core yarn is untwisted and the elastic yarn and the non-elastic yarn are left in a slack state in the covering yarn after preparation. Was C and D / C was 1.42, where D was the length of the inelastic yarn. Table 1 shows the physical properties of the obtained coated elastic yarn.
A sock was produced in the same manner as in Comparative Example 1 except that the covered elastic yarn obtained on the surface in contact with the skin in a range of 4.0 cm in length was knitted into the mouth rubber part of the sock. As a result of conducting a pull-out test using the produced socks, the pull-out strength was 4552 cN. Table 1 shows the physical property measurement results and the wear test results of the obtained socks.

[Example 5]
A polyurethane elastic yarn of 620 dt / 72f containing a polyalkylene ether diol having two methyl groups as side chains on the same carbon as the diol component is used as a core yarn, and a 13 dt / 7f polyamide fiber is used as a covering yarn. Then, the polyurethane elastic yarn was coated at a twist number of 800 T / m to obtain a covering yarn. The length of the elastic yarn when the non-elastic yarn coated from the polyurethane elastic yarn as the core yarn is untwisted and the elastic yarn and the non-elastic yarn are left in a slack state in the covering yarn after preparation. Is C2, and the length of the inelastic yarn is D, D / C is 1.52. Table 1 shows the physical properties of the obtained coated elastic yarn.
A sock was produced in the same manner as in Comparative Example 1 except that the covered elastic yarn obtained on the surface in contact with the skin in a range of 4.0 cm in length was knitted into the mouth rubber part of the sock. As a result of conducting a pull-out test using the produced socks, the pull-out strength was 3421 cN. Table 1 shows the physical property measurement results and the wear test results of the obtained socks.

[Example 6]
A 620 dt / 72f polyurethane elastic yarn containing a polyalkylene ether diol having two methyl groups as side chains on the same carbon is used as a core yarn, and a 13 dt / 7f polyamide fiber is used as a covering yarn, and twisted. The polyurethane elastic yarn was coated at a number of 300 T / m to obtain a covering yarn. The length of the elastic yarn when the non-elastic yarn coated from the polyurethane elastic yarn as the core yarn is untwisted and the elastic yarn and the non-elastic yarn are left in a slack state in the covering yarn after preparation. Was C, and the length of the inelastic yarn was D, D / C was 1.93. Table 1 shows the physical properties of the obtained coated elastic yarn.
A sock was produced in the same manner as in Comparative Example 1 except that the covered elastic yarn obtained on the surface in contact with the skin in a range of 4.0 cm in length was knitted into the mouth rubber part of the sock. As a result of a pull-out test using the produced socks, the pull-out strength was 4782 cN. Table 1 shows the physical property measurement results and the wear test results of the obtained socks.

[Example 7]
A 420 dt / 72f polyurethane elastic yarn containing a polyalkylene ether diol having two methyl groups as side chains on the same carbon as the diol component is used as the core yarn, and a 13 dt / 7f polyamide fiber is used as the covering yarn. Then, the polyurethane elastic yarn was coated at a twist number of 300 T / m to obtain a covering yarn. The length of the elastic yarn when the non-elastic yarn coated from the polyurethane elastic yarn as the core yarn is untwisted and the elastic yarn and the non-elastic yarn are left in a slack state in the covering yarn after preparation. Is C, and the length of the inelastic yarn is D, D / C is 1.40. Table 1 shows the physical properties of the obtained coated elastic yarn.
A sock was produced in the same manner as in Comparative Example 1 except that the covered elastic yarn obtained on the surface in contact with the skin in a range of 4.0 cm in length was knitted into the mouth rubber part of the sock. As a result of conducting a pull-out test using the produced socks, the pull-out strength was 3794 cN. Table 1 shows the physical property measurement results and the wear test results of the obtained socks.

[Example 8]
As a diol component, a polyurethane elastic yarn of 620 dt / 72f containing a polyalkylene ether diol having one methyl group as a side chain is used as a core yarn, and a polyamide yarn of 33 dt / 26f is used as a covering yarn. Was covered with a polyurethane elastic yarn at 300 T / m to obtain a covering yarn. The length of the elastic yarn when the non-elastic yarn coated from the polyurethane elastic yarn as the core yarn is untwisted and the elastic yarn and the non-elastic yarn are left in a slack state in the covering yarn after preparation. Was C and D was the length of the inelastic yarn, D / C was 1.56. Table 1 shows the physical properties of the obtained coated elastic yarn.
A sock was produced in the same manner as in Comparative Example 1 except that the covered elastic yarn obtained on the surface in contact with the skin in a range of 4.0 cm in length was knitted into the mouth rubber part of the sock. As a result of conducting a pull-out test using the produced socks, the pull-out strength was 3991 cN. Table 1 shows the physical property measurement results and the wear test results of the obtained socks.

[Comparative Example 2]
A polyurethane elastic yarn of 620 dt / 72f containing a polyalkylene ether diol having two methyl groups as side chains on the same carbon as the diol component is used as a core yarn, and a polyamide fiber of 56 dt / 34f is used as a covering yarn. Then, the polyurethane elastic yarn was coated at a twist number of 300 T / m to obtain a covering yarn. The length of the elastic yarn when the non-elastic yarn coated from the polyurethane elastic yarn as the core yarn is untwisted and the elastic yarn and the non-elastic yarn are left in a slack state in the covering yarn after preparation. Is C and D / C is 1.41 where D is the length of the inelastic yarn. Table 1 shows the physical properties of the obtained coated elastic yarn.
A sock was produced in the same manner as in Comparative Example 1 except that the covered elastic yarn obtained on the surface in contact with the skin in a range of 4.0 cm in length was knitted into the mouth rubber part of the sock. As a result of a pull-out test using the produced socks, the pull-out strength was 3152 cN. Table 1 shows the physical property measurement results and the wear test results of the obtained socks.

[Comparative Example 3]
A 310 dt / 72f polyurethane elastic yarn containing a polyalkylene ether diol having two methyl groups as side chains on the same carbon as the diol component is used as the core yarn, and a 13 dt / 7f polyamide fiber is used as the covering yarn. Then, the polyurethane elastic yarn was coated at a twist number of 300 T / m to obtain a covering yarn. The length of the elastic yarn when the non-elastic yarn coated from the polyurethane elastic yarn as the core yarn is untwisted and the elastic yarn and the non-elastic yarn are left in a slack state in the covering yarn after preparation. Is C and D is the length of the inelastic yarn, D / C is 1.45. Table 1 shows the physical properties of the obtained coated elastic yarn.
A sock was produced in the same manner as in Comparative Example 1 except that the covered elastic yarn obtained on the surface in contact with the skin in a range of 4.0 cm in length was knitted into the mouth rubber part of the sock. As a result of conducting a pull-out test using the produced socks, the pull-out strength was 2910 cN. Table 1 shows the physical property measurement results and the wear test results of the obtained socks.

[Comparative Example 4]
A polyurethane elastic yarn of 310 dt / 72f having PTMG as the main chain is used as a core yarn, a polyamide fiber of 13 dt / 7f is used as a covering yarn, and the polyurethane elastic yarn is coated at a twist number of 300 T / m. A covering yarn was obtained. The length of the elastic yarn when the non-elastic yarn coated from the polyurethane elastic yarn as the core yarn is untwisted and the elastic yarn and the non-elastic yarn are left in a slack state in the covering yarn after preparation. Was C and D was the length of the inelastic yarn, the D / C was 1.32. Table 1 shows the physical properties of the obtained coated elastic yarn.
A sock was produced in the same manner as in Comparative Example 1 except that the covered elastic yarn obtained on the surface in contact with the skin in a range of 4.0 cm in length was knitted into the mouth rubber part of the sock. As a result of conducting a pull-out test using the produced socks, the pull-out strength was 3021 cN. Table 1 shows the physical property measurement results and the wear test results of the obtained socks.

  In Examples 1 to 8, the frictional force between the skin and the socks could be increased by knitting a coated elastic yarn under a predetermined condition in the mouth rubber part, and displacement could be reduced. As for Comparative Examples 2 to 4, although slight shift reduction was observed due to the improvement of the frictional force, the results were less effective.

  Moreover, as a result of the questionnaire at the time of wearing, in the socks of Examples 1 to 3, 5 and Examples 7 and 8, there is no excessive tightening feeling at the time of wearing as compared with Comparative Example 1, and the detachability is also easy. The result was not much different.

  Regarding Examples 4 and 6, although the displacement effect was obtained, the power of the coated elastic yarn was strong, and the result was that the detachability was lowered compared to Comparative Example 1 in which the coated elastic yarn was not knitted into the mouth rubber. It was.

  From the above, we can increase the frictional force between the skin and the undercarriage product by knitting the coated elastic yarn created under the specified conditions into the mouth rubber part of the undercarriage product such as socks, and suppress the slippage. Therefore, it is possible to obtain an underbody product typified by socks that are difficult to slip off.

  Since the coated elastic yarn of the present invention has a high coefficient of friction, it can be imparted with a sufficient anti-slip effect without impairing detachability and wearing feeling by being knitted into an undersole product such as socks as a non-slip. Suspension products such as socks that do not easily fall off can be provided.

1 Mouth rubber part 2 Leg part 3 Foot part 4 Gore line 5 Toe part 6 Constant speed extension type tensile tester lower cell 7 Poly container (covered with artificial leather)
8 Binding band 9 Marking point 10 Constant speed extension type tensile tester upper cell

Claims (8)

  A covering yarn in which a polyurethane elastic yarn having a fineness of 400 dtex to 1240 dtex is arranged on the core yarn and an inelastic yarn is arranged on the sheath yarn, and the fineness of the polyurethane elastic yarn is A and the fineness of the inelastic yarn is B A / B is 15-80, The covered elastic yarn characterized by the above-mentioned.   The coated elastic yarn according to claim 1, wherein the number of twists of the inelastic yarn is 100 to 500 T / m.   When the inelastic yarn coated from the polyurethane elastic yarn is untwisted to make the elastic yarn and the inelastic yarn slack, the length of the elastic yarn is C, and the length of the inelastic yarn is The coated elastic yarn according to claim 1, wherein when D, 1.0 ≦ D / C ≦ 1.7.   The covered elastic yarn according to any one of claims 1 to 3, wherein the polyurethane elastic yarn contains a component having a side chain as a polyalkylene ether diol component.   The coated elastic yarn according to claim 4, wherein at least a part of the side chain is two methyl groups on the same carbon.   An undercarriage product, wherein the coated elastic yarn according to any one of claims 1 to 5 is knitted in the vicinity of an opening or in a mouth rubber part.   The undercarriage product according to claim 6, wherein the undercarriage product is a sock.   The sock according to claim 7, wherein the pull-out strength is 3300 to 6000 cN.

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