JP2020117834A - Tubular knit fabric - Google Patents

Abstract

To provide a tubular knit fabric which is less likely to run when worn and has a function of feeling coolness in a hot environment.SOLUTION: A tubular knit fabric contains two kinds of covered elastic yarns that are obtained by covering an elastic yarn with a non-elastic yarn and the knit fabric is knitted in a jersey stitch structure. An elastic fiber constituting at least one kind of covered elastic yarn out of the two kinds of covered elastic yarns is a fixing elastic yarn. At least one kind of covered elastic yarn is a covered elastic yarn having a moisture absorption of 3.5% or more, and the tubular knit fabric has unraveling stress of 2.0 cN or more.SELECTED DRAWING: None

Description

The present invention relates to a tubular knitted fabric.

Conventionally, a tubular knitted fabric made of a covered elastic yarn obtained by covering an elastic yarn with an inelastic yarn by covering etc., which is worn in a hot environment, for example, panty hose, leggings or other stockings covering the inseam to ankles or toes, knees. For tubular products such as short stockings (also called high socks), arm covers, gaiters that cover the area from the vicinity to the ankles or toes, when the tubular knitted fabric is hooked during wearing, the coated elastic yarn used is It is easy to generate a conductor line that is cut (teared) and the stitches are continuously released from it. Especially, this conductor line occurs in a thin tubular knitted fabric using a thin coated elastic yarn worn in a hot environment. It is known to be easy. In order to prevent this power transmission, it is necessary to add a tuck or miss structure to the structure of the knitted fabric to make the structure hard to transmit, but the structure difficult to transmit does not look good as a product. Therefore, recently, the elastic yarn used for the coated elastic yarn is changed to the elastic yarn that is fused by the steam set at the time of manufacturing the tubular knitted fabric, that is, the elastic yarn that is melted and adheres to each other at the intersection of the loops. Alternatively, a covered elastic yarn including elastic yarns (hereinafter referred to as elastic yarns that fix both together or elastic yarns) in which the elastic yarns are formed between the elastic yarns at the intersections of the loops and the loops become difficult to move is used. A tubular knitted fabric is manufactured to prevent transmission of electric power.

However, for example, in a tubular knitted fabric such as stockings that is excellent in a cool feeling when worn in a hot environment as described in Patent Document 1 below, the fineness of the coated elastic yarn used is low, and all knitted fabric loops are used. When a coated elastic yarn including an elastic yarn to which is adhered is used, a transmission line preventing effect is obtained, but the texture of the adhered portion is likely to be hard, and a tubular knitted fabric having a good texture is unlikely to be obtained. In particular, in the case of the tubular knitted fabric in which the coated elastic yarn containing the elastic yarn that is fixed to improve the texture and the coated elastic yarn containing the elastic yarn that is not fixed are interwoven, the texture is good, but sufficient fixing strength can be obtained. In addition, there is a problem that the effect of preventing the transmission line is not exerted.
As described above, when a tubular knitted fabric such as stockings and an arm cover is worn, a tubular knitted fabric that has a good texture, is less likely to cause a transmission line, and has the function of feeling cool in a hot environment is not yet available. Not obtained.

International Publication No. 2018/070439

In view of the above-mentioned problems of the prior art, the problem to be solved by the present invention is that while having a good texture, a transmission line when worn is unlikely to occur, and also has a function of feeling cool in a hot environment. It is to provide a knitted fabric.

As a result of intensive studies and experiments to solve the above problems, it is important that the elastic thread to be fixed can sufficiently exert the fixing effect. Therefore, a coated elastic thread using the elastic thread to be fixed is used. The inventors have found that the above problems can be solved by interlacing a covered elastic yarn having excellent hygroscopicity with a plain knitted fabric, and completed the present invention.

That is, the present invention is as follows.
[1] A tubular knitted fabric containing two types of coated elastic yarn in which an elastic yarn is coated with a non-elastic yarn, and knitted with a plain cloth structure, wherein at least one of the two types of coated elastic yarn is provided. The elastic thread constituting the covered elastic thread is a fixed elastic thread, at least one kind of the covered elastic thread is a covered elastic thread having a moisture absorption rate of 3.5% or more, and the tubular knitted fabric The tubular knitted fabric is characterized in that the unraveling stress of is not less than 2.0 cN.
[2] Of the two types of coated elastic yarns, the elastic yarn that constitutes one of the coated elastic yarns is an elastic yarn that adheres, and the elastic yarn that constitutes the other coated elastic yarn is an elastic yarn that does not adhere. The tubular knitted fabric according to the above [1].
[3] The tubular knitted fabric according to [1] or [2], wherein each of the two types of coated elastic yarns has a fineness of 10 dtex to 45 dtex.
[4] The tubular knitted fabric according to any one of [1] to [3], in which one of the two types of covered elastic yarns is alternately knitted.
[5] The following formula (1) of the two types of coated elastic yarns:
Twist index ratio=(twist index of coated elastic yarn A)/(twist index of coated elastic yarn B)...Equation (1)
{In the formula, the coated elastic yarn A is the following formula (2) among the two types of coated elastic yarns:
Twisting index=(number of twists when the coated elastic yarn is extended)×(length of elastic yarn constituting the coated elastic yarn after untwisting of the coated elastic yarn)/(the coating after untwisting of the coated elastic yarn) (Length of non-elastic thread constituting elastic thread)... Formula (2)
(In the formula, "the number of twists of the coated elastic yarn at the time of extension" is the number of twists of the coated elastic yarn at a length of 50 cm at a load of 20 g, and "the elastic yarn constituting the coated elastic yarn after untwisting""Length" is the length of an elastic yarn obtained by untwisting 50 cm of the coated elastic yarn under a load of 20 g, under a load of 0.02 g, and "constituting the coated elastic yarn after untwisting". "The length of the non-elastic yarn" is the length of the non-elastic yarn obtained by untwisting 50 cm of the coated elastic yarn under the load of 20 g, and the twist index represented by the higher value. Coated elastic yarn, and coated elastic yarn B is the coated elastic yarn with the lower twist index. } The tubular knitted fabric according to any one of the above [1] to [4], wherein the twist index ratio is 1.00 to 1.30.
[6] A stocking including the tubular knitted fabric according to any one of [1] to [5].

INDUSTRIAL APPLICABILITY The tubular knitted fabric according to the present invention is a tubular knitted fabric which has a good texture, is less likely to generate a conductive line even if it is torn when worn, and is cool when worn even in a hot environment.

It is drawing which shows the stress change at the time of the unraveling stress measurement of a coated elastic yarn. “A” represents a change in unraveling stress, “b” represents a peak value of unraveling stress (marked with ◯), and “c” represents a peak (marked with “Δ”) which is not determined as a peak value of unraveling stress.

Hereinafter, embodiments of the present invention will be described in detail.
The tubular knitted fabric of the present embodiment is a tubular knitted fabric that includes two types of covered elastic yarns obtained by coating elastic yarns with non-elastic yarns, and is knitted with a plain cloth structure. Among the threads, at least one kind of elastic thread constituting the covered elastic thread is an elastic thread to be fixed, and at least one kind of covered elastic thread is a covered elastic thread having a moisture absorption rate of 3.5% or more, Moreover, the unraveling stress of the tubular knitted fabric is 2.0 cN or more. Of the two types of covered elastic yarns, one of the covered elastic yarns is an elastic yarn that is fixed, and the other elastic yarn that is formed of the covered elastic yarns is an unfixed elastic yarn. preferable.

The tubular knitted fabric of the present embodiment preferably does not contain a tack structure or a welt structure, and particularly preferably has a plain cloth structure, from the viewpoint of making it difficult to form an air layer having a heat retaining effect and enhancing the heat dissipation effect.
Of the two types of covered elastic yarns that form the tubular knitted fabric of the present embodiment, at least one of the covered elastic yarns is preferably an elastic yarn that is fixed. Since at least one of the coated elastic yarns is an elastic yarn that adheres, when the coated elastic yarn forming the loop of the stitch is cut when the tubular knitted fabric is worn, the elastic yarn in the coated elastic yarn is elastic. Wires can be prevented by fixing the threads to each other or the elastic threads and the inelastic threads.

In the present specification, the “elastic thread that sticks” is an elastic thread that is melted or shaped by steam set at 100° C. for 20 seconds. The elastic yarn to be shaped is preferable because the tubular knitted fabric using the elastic yarn has a softer texture. The method for producing the elastic yarn to be fixed is not particularly limited, but for example, a polymer polyol, a diisocyanate, a bifunctional amine, and a monofunctional active hydrogen atom-containing terminal terminating agent as described in Japanese Patent No. 4993277. It can be produced by a method using as a raw material a composition having a content of the polyurethaneurea polymer obtained by the reaction of 60% by weight or more.

From the viewpoint of preventing a transmission line during wearing and providing a tubular knitted fabric having a good texture, the tubular knitted fabric is composed of two types of coated elastic yarns, and one of the two types of coated elastic yarns is used. It is preferable that the elastic yarn that constitutes the covered elastic yarn is an elastic yarn, and the elastic yarn that constitutes the other covered elastic yarn is an elastic yarn that does not adhere. This is because, for example, by knitting the covered elastic yarn including the elastic yarn to be fixed and the covered elastic yarn including the elastic yarn not to be fixed alternately, the fixing points of the elastic yarn in the covered elastic yarn are reduced and the texture is improved. This is because it gets better. Generally, in the case of knitting a covered elastic yarn made of elastic yarns that stick to each other and a coated elastic yarn made of elastic yarns that do not stick to each other, compared to the case of using a covered elastic yarn made of elastic yarns that all stick As a result, the fixing effect is small, and naturally the conductive wire is likely to occur. However, in the tubular knitted fabric of the present embodiment, by being used in combination with a covered elastic yarn having a high hygroscopicity described later, it is possible to prevent a transmission line when worn, and a tubular knitted fabric having a good texture. ..

In the tubular knitted fabric of the present embodiment, the moisture absorption rate of at least one of the coated elastic yarns is increased from the viewpoint of enhancing the fixing effect of the elastic yarns to be fixed and obtaining sufficient fixing strength without setting a strong heat setting condition. It is preferably at least 3.5%, more preferably at least 4.0%. If the moisture absorption rate of at least one of the coated elastic yarns is 3.5% or more, even if the coated elastic yarn made of the fixed elastic yarns is not knitted in all the courses of the tubular knitted fabric, the sufficient transmission line is obtained. A tubular knitted fabric having a soft texture is obtained with a preventive effect. Although this mechanism is not clear, the elastic yarn in the coated elastic yarn becomes softer than that in the dry heat setting due to the wet heat setting during the production of the tubular knitted fabric, and the elastic yarn is easily deformed or melted and fixed. Therefore, it is presumed that the higher the moisture absorption rate of at least one of the coated elastic yarns is, the more firmly the elastic yarns are fixed to each other or the elastic yarns and the coated elastic yarns are more firmly adhered, and the effect of preventing the transmission line is enhanced. ..

In the present specification, the method for obtaining the moisture absorption rate of the coated elastic yarn is as follows.
The tubular knitted fabric is unraveled to separate the two types of coated elastic yarns, and the two types of withdrawn elastic yarns are separately collected to a total weight of about 2 g. When two kinds of covered elastic yarns are stuck and cannot be pulled out from the tubular knitted fabric, the sticking points of the elastic yarns may be cut and unwound. The collection of coated elastic yarns thus extracted is left in a hot air dryer at 100° C., taken out 5 hours later, and the weight (weight immediately after drying) is measured by a precision balance, and then 30° C. 90% RH. After being left in the environment of 12 hours, it is taken out after 12 hours and the weight (weight after humidity adjustment) is measured by a precision balance, and the following formula (3):
Moisture absorption rate (%) of coated elastic yarn={(weight after humidity adjustment)-(weight immediately after drying)}/(weight immediately after drying)×100... Formula (3)
The value obtained by is defined as the moisture absorption rate (%).

Of the two types of coated elastic yarns that form the tubular knitted fabric of the present embodiment, at least one of the coated elastic yarns has a moisture absorption rate of 3.5% or more. The moisture absorption rate above may be used.
The method for producing the covered elastic yarn having a moisture absorption rate of 3.5% or more that constitutes the tubular knitted fabric of the present embodiment includes a method of coating the elastic yarn with a non-elastic yarn having a high moisture absorption rate, and an elastic yarn having a high moisture absorption rate. Or a method in which both the elastic yarn and the non-elastic yarn covering the elastic yarn are made into fibers having a high hygroscopic rate. Either method may be used, but a method in which both the elastic yarn and the non-elastic yarn covering the elastic yarn are made into fibers having a high moisture absorption rate is more preferable.

If cellulose fibers are used to cover the elastic yarn, the moisture absorption rate can be increased to about 8%. However, it is preferable to use a thin covered elastic yarn in order to make a tubular knitted fabric that is cool in a hot environment. From the viewpoint of burst strength, the non-elastic yarn that covers the elastic yarn is better than a thin cellulose fiber filament. Synthetic fibers are preferred. Also, from the viewpoint that the tubular knitted fabric can be thinned in order to obtain a cool tubular knitted fabric when worn, synthetic fibers are preferable to thick spun cellulose fibers as the non-elastic yarn that covers the elastic yarns. Therefore, in the present embodiment, as the non-elastic yarn that covers the elastic yarn, polyester fibers such as polyethylene terephthalate and polytrimethylene terephthalate, polyamide fibers such as nylon 6 and nylon 66, polyolefin fibers such as polyethylene and polypropylene are used. Synthetic fibers such as the above are preferable, but from the viewpoint of moisture absorption, it is particularly preferable to use polyamide fibers. Further, these bright yarn, semi-dull yarn, full dull yarn and the like can be arbitrarily used. As for the cross-sectional shape of the non-elastic yarn, fibers having any cross-sectional shape such as a round shape, an elliptic shape, a W shape, a cocoon shape, and a hollow fiber can be used.

The form of the non-elastic yarn is also not particularly limited, and a raw yarn, a crimped yarn such as false twist can be used, but it is preferable to use a raw yarn that is excellent in cool feeling. It is also possible to add 0.3 to 5% by weight of an inorganic substance such as titanium oxide or an agent having excellent moisture absorption to the non-elastic yarn. By containing these, knitting excellent in heat dissipation, moisture absorption and sweat absorption is possible. The ground can be manufactured. The fineness of the non-elastic yarn is preferably 5 to 35 dtex (decitex: the same symbols will be used hereinafter), and more preferably 8 to 25 dtex.

The elastic yarns constituting the two types of coated elastic yarns used in the tubular knitted fabric of the present embodiment may be polyurethane or polyether ester elastic yarns, and those obtained by dry spinning or melt spinning may be used. It can be used, and the polymer and spinning method are not particularly limited. The breaking elongation of the elastic yarn is preferably about 400% to 1000%, and it is preferable that the elasticity is not impaired at a normal treatment temperature of 180° C. in the preset step during dyeing. Further, it is also possible to use an elastic yarn which is added with a special polymer or powder to impart functionality such as high setting property, antibacterial property, moisture absorption and water absorption. The fineness of the elastic yarn forming the covered elastic yarn is preferably 8 to 35 dtex, more preferably 10 to 25 dtex.

The elastic yarn forming the coated elastic yarn can also contain an inorganic substance, and can be a knitted fabric in which the performance of the contained inorganic substance is taken into consideration. For example, when titanium oxide is contained, thermal conductivity is improved. A knitted fabric having excellent heat dissipation can be obtained. The simplest method for containing an inorganic substance is to add an inorganic substance to a stock solution for spinning an elastic yarn and perform spinning.
In the present specification, the term “inorganic substance” refers to a simple substance of an inorganic substance such as ceramics such as titanium oxide and/or an inorganic compound, preferably in the form of fine powder so as not to hinder the spinning of the elastic yarn. It should be noted that when the amount of the inorganic substance is small, the heat dissipation effect is small, and when the amount is too large, the yarn may break during spinning or stretching, so the content is preferably 1 to 10% by weight, and more preferably 2 to 5% by weight. ..

The method for producing an elastic yarn having a high moisture absorption rate is not particularly limited. For example, as described in Japanese Patent No. 3837024, a water-absorbent resin having a water absorption rate of 500 to 4000% by weight is added to the elastic yarn in an amount of 1 to 1. It can be produced by containing 15% by weight in a finely dispersed state, whereby an elastic yarn having a moisture absorption rate of about 2% is obtained.

In the tubular knitted fabric of the present embodiment, the stress when unraveling the covered elastic yarn from the knitting end portion of the tubular knitted fabric, that is, the unknitting stress is 2.0 cN (centinewton: 100 minutes of Newton). 1: The same symbols will be used hereinafter.) It is preferable if it is at least the above because it is sufficiently fixed. When the unraveling stress is 2.0 cN or more, the tubular knitted fabric is hard to be transmitted, and more preferably 2.3 cN or more.

The method of obtaining the unraveling stress will be specifically described in the section of the following examples, but the coated elastic yarn is extracted from the end of the knitting end of the tubular knitted fabric, and the stress of the unraveling fabric is measured with a Tensilon tensile tester. Then, the knitted fabric course is not knitted, and the knitted fabric is sequentially knitted.

In the tubular knitted fabric of the present embodiment, in order to make it feel cool even in a hot environment, it is preferable to use a coated elastic yarn having a low fineness, specifically, a fineness of 10 to 45 dtex as the coated elastic yarn. It is more preferable that the coated elastic yarn with the fineness is used for all courses of the leg portion.

When a fiber with a low fineness is used in a tubular knitted fabric so as to be suitable for wearing in a hot environment, the fixing point between the elastic yarns in the coated elastic yarn is generally small and the fixing strength cannot be increased. Lines are more likely to occur. In this case, if the heat setting condition is increased in order to increase the fixing strength, the fixing strength increases, but the fixing point spreads and the fixing point comes into direct contact with the skin, which is not preferable because the texture is rough. However, in the tubular knitted fabric of the present embodiment, as described above, the covering elastic yarn including the fixing elastic yarn and the covering elastic yarn having a high hygroscopicity are used in combination to increase the fixing property and have a low fineness. Even when the fiber is used, it is possible to prevent the transmission line and the touch is good.

The measurement of the fineness of the coated elastic yarn is as follows.
The coated elastic yarn in the tubular knitted fabric is unwound, a load of 20 g is applied to the coated elastic yarn, a mark is made between the lengths of 50 cm, the weight is measured, and the fineness is calculated from the length and the weight. Let the average of this measurement be the fineness. When the covered elastic yarn is stuck and is difficult to be unwound from the tubular knitted fabric, the sticking point is cut so that it is unwound to a predetermined length.

The arrangement of the coated elastic yarns forming the tubular knitted fabric of the present embodiment on the knitted fabric is not particularly limited, and, for example, two types of the coated elastic yarns are alternately arranged or alternately arranged. However, from the viewpoint of improving the quality by suppressing the weft and improving the adhesiveness of the elastic yarn, it is preferable that the two types of covered elastic yarns are arranged in a one-to-one arrangement, and further, one knitted yarn is knitted alternately. Is more preferable. In particular, when two types of coated elastic yarns having different moisture absorption rates are used, and one of the two types of coated elastic yarns has a moisture absorption rate of less than 3.5%, the above arrangement can be adopted. The effect of improving the above-mentioned quality and adherence becomes remarkable.

Generally, when two types of coated elastic yarns are used, poor quality such as weft is likely to occur. Therefore, the present inventors have conducted a study to make a high-quality tubular knitted fabric that is difficult to transmit even if a hole is opened by a wearing operation and also has a coolness, the number of twists of the coated elastic yarn, and the elasticity. By setting the twist index ratio, which is calculated from the amount of yarn extension, within a specific range, it is possible to prevent poor quality such as wefts from occurring, and it is equivalent to a tubular knit fabric manufactured using only one type of coated elastic yarn. It was found that a high-quality tubular knitted fabric can be obtained.

That is, the following formula (1) of two types of coated elastic yarns:
Twist index ratio=(twist index of coated elastic yarn A)/(twist index of coated elastic yarn B)...Equation (1)
{In the formula, the coated elastic yarn A is the following formula (2) among the two types of coated elastic yarns:
Twisting index=(number of twists when the coated elastic yarn is extended)×(length of elastic yarn constituting the coated elastic yarn after untwisting of the coated elastic yarn)/(the coating after untwisting of the coated elastic yarn) (Length of non-elastic thread constituting elastic thread)... Formula (2)
(In the formula, "the number of twists of the coated elastic yarn at the time of extension" is the number of twists of the coated elastic yarn at a length of 50 cm at a load of 20 g, and "the elastic yarn constituting the coated elastic yarn after untwisting""Length" is the length of an elastic yarn obtained by untwisting 50 cm of the coated elastic yarn under a load of 20 g, under a load of 0.02 g, and "constituting the coated elastic yarn after untwisting". "The length of the non-elastic yarn" is the length of the non-elastic yarn obtained by untwisting 50 cm of the coated elastic yarn under the load of 20 g, and the twist index represented by the higher value. Coated elastic yarn, and coated elastic yarn B is the coated elastic yarn with the lower twist index. } If the twist index ratio determined by the above is 1.00 to 1.30, a high-quality tubular knitted fabric is obtained, and 1.00 to 1.25 is more preferable.

Regarding the adjustment of the twist index ratio, the number of twists of the non-elastic yarn at the time of manufacturing the coated elastic yarn, and the elongation ratio of the elastic yarn (((of the non-elastic yarn constituting the coated elastic yarn after untwisting the coated elastic yarn, (Length)/(length of elastic yarn constituting covered elastic yarn after untwisting of coated elastic yarn)), and the twist index obtained by the above formula (2) is about 500 to 700. Preferably, in this range, a covered elastic yarn with sufficient fixation of the elastic yarn can be obtained. The twist index represented by the formula (2) is equivalent to (the number of twists of the covered elastic yarn when it is extended)/(elongation ratio of the elastic yarn). Further, it is preferable that the two types of coated elastic yarns have the same draft ratio (elongation ratio of the elastic yarns in the coated elastic yarn) of the elastic yarns. It is more preferably 5 to 3.5. The draft rate is a draft rate at the time of producing the coated elastic yarn, and when the tubular knitted fabric is used, the draft rate of the coated elastic yarn may not be maintained as it is due to shrinkage of the fiber, and in that case, The elongation ratio between the two types of coated elastic yarns (the length of the non-elastic yarns constituting the coated elastic yarns after untwisting the coated elastic yarns)/(the coated elastic yarns after untwisting the coated elastic yarns) It suffices to reduce the difference in the length (the difference in the elongation ratio) of the constituent elastic yarns. Specifically, if the difference in the elongation ratio is within 0.1 between the two types of coated elastic yarns, It is possible to manufacture a tubular knitted fabric having no problem in quality.

In the tubular knitted fabric of the present embodiment, the human body and the tubular knitted fabric are in close contact when the tubular knitted fabric is worn, the knitted fabric loop forming the tubular knitted fabric and the skin are in close contact, and the apparent leg surface area is By increasing the amount, the heat radiation area on the surface of the human body is also increased, the heat radiation from the human body is advanced, and it becomes a tubular knitted fabric that feels cooler when worn and lasts immediately after being worn. From the above viewpoint, the fineness of the covered elastic yarn is preferably 10 to 45 dtex, and more preferably 13 to 43 dtex. From the same viewpoint, in the case of a knitting machine having a shuttle diameter of 4 inches, it is preferable to use a knitting machine having 350 to 410 stitches.

When the tubular knitted fabric of the present embodiment is stockings, the stretch length of the portion corresponding to the thigh is important in order to efficiently dissipate heat from the leg surface of the human body, and is 1/4 from the inseam. The stretch length at the part of ML is the number of needles for the ML size stocking ×0.115 to 0.130 (cm), and the number of needles for the L-LL size stocking is ×0.130 to 0.140 (cm). It is preferable to have. In addition, the measurement of the stretch length is the finished product, and the length is measured by extending both ends of the stocking to both sides under a load of 29 N at a position ¼ of the leg length from the crotch.

The knitting machine used to manufacture the tubular knitted fabric of the present embodiment is not particularly limited, but is preferably a single circular knitting machine (also called a pantyhose knitting machine) having a small diameter of about 4 to 5 inches as a shuttle diameter. Can be).
As a method for dyeing and finishing the tubular knitted fabric of the present embodiment, a preset and finishing set are preferably wet heat set by steam or the like. For example, a pre-dyeing preset is wet heat 100 to 130° C. for about 30 minutes, and a finish set is If possible, the strength and weakness of the conditions may be selected according to the desired degree of fixation, for example, by putting it in a mold and setting it at 100 to 120° C. for about 15 to 30 seconds. In addition, dyeing is performed according to the dyeing conditions according to the fiber material to be used, and the dyeing machine to be used may be a paddle dyeing machine, a drum dyeing machine, etc. It can be used as desired.
The tubular knitted fabric of this embodiment is effective for underbody products such as pantyhose, leggings, and high socks, as well as for arm covers, gaiters, etc., and is cool and wearable when worn in a hot environment. It will be a difficult product.

Hereinafter, the present invention will be specifically described with reference to Examples and Comparative Examples, but the present invention is not limited to these Examples. Evaluations in the following examples and the like were performed by the following methods.

[1] Moisture absorption rate The tubular knitted fabric is unknitted to separate the two types of coated elastic yarns, and the two types of extracted coated elastic yarns are separately collected to a total weight of about 2 g. When two kinds of covered elastic yarns are stuck and cannot be pulled out from the tubular knitted fabric, the sticking points of the elastic yarns may be cut and unwound. The collection of coated elastic yarns thus extracted is left in a hot air dryer at 100° C., taken out 5 hours later, and the weight (weight immediately after drying) is measured by a precision balance, and then 30° C. 90% RH. After being left in the environment of 24 hours, it is taken out after 24 hours and the weight (weight after humidity adjustment) is measured by a precision balance, and the following formula (3):
Moisture absorption rate (%) of coated elastic yarn={(weight after humidity adjustment)-(weight immediately after drying)}/(weight immediately after drying)×100... Formula (3)
Calculate the moisture absorption rate (%) from the above, and round the result to the second decimal place.

[2] Unknitting stress A small amount of the coated elastic yarn is withdrawn from the end of the tubular knitted fabric until it can be grasped in the grip of the Tensilon tensile tester, and the extracted coated elastic yarn is grasped in the grip of the Tensilon tensile tester. Then, the stress is measured for 100 mm of the tubular knitted fabric with the coated elastic yarn under the following tensile conditions. As shown in Fig. 1, the method for obtaining the unraveling stress is to measure the stress change (Fig. 1a) in which the coated elastic yarn is sequentially withdrawn with many stress peaks by the following Tensilon tensile tester. Measurement (a peak with a stress decrease of 1.0 cN or more after the stress peak during disassembly (circle in FIG. 1b) is judged as a peak, and a peak with a stress decrease of less than 1.0 cN (see FIG. 1c). (Marked with Δ) is not judged as a peak), the values of the top 10 stress values are measured, and the average of the 10 positions is taken as the unraveling stress of the coated elastic yarn, and this measurement is made into 10 coated elastic yarns. Is performed and the average of 10 pieces is taken as the unraveling stress. Furthermore, the unraveling stresses of the two types of coated elastic yarns, that is, the coated elastic yarns including the elastic yarns to be fixed and the coated elastic yarns including the elastic yarns having excellent hygroscopicity, are obtained, and the average of the two types of the coated elastic yarns is unfolded Use as stress, and round down to the first decimal place.

Tensile tester: Tensilon tensile tester (RTC-1210A manufactured by Orientec Co., Ltd.)
Gripping method: The end portion of the coated elastic yarn extracted from the tubular knitted fabric in a small amount is gripped by the upper grip portion of the Tensilon tensile tester. Next, the circumferential direction of the tubular knitted fabric is substantially horizontal and the entire circumferential direction of the tubular knitted fabric is gripped by the lower gripping part of the Tensilon tensile tester with a width of about 50 mm at the end of the tubular knitted fabric that is being pulled out. Fold it in and hold it.
Length of extracting the coated elastic yarn: 100 mm in the width direction of the tubular knitted fabric (in the case of a tubular knitted fabric having a width of 100 mm, the maximum width is set.
The coated elastic yarn is unknitted at a pulling speed of 300 mm/min.

[3] Twisting index ratio The twisting index ratio is calculated by the following equation (1):
Twist index ratio=(twist index of coated elastic yarn A)/(twist index of coated elastic yarn B)...Equation (1)
{In the formula, the coated elastic yarn A is the following formula (2) among the two types of coated elastic yarns:
Twisting index=(number of twists when the coated elastic yarn is extended)×(length of elastic yarn constituting the coated elastic yarn after untwisting of the coated elastic yarn)/(the coating after untwisting of the coated elastic yarn) Length of non-elastic thread that constitutes elastic thread} Equation (2)
(In the formula, "the number of twists of the coated elastic yarn at the time of extension" is the number of twists of the coated elastic yarn at a length of 50 cm at a load of 20 g, and "the elastic yarn constituting the coated elastic yarn after untwisting""Length" is the length of an elastic yarn obtained by untwisting 50 cm of the coated elastic yarn under a load of 20 g, under a load of 0.02 g, and "constituting the coated elastic yarn after untwisting". "The length of the non-elastic yarn" is the length of the non-elastic yarn obtained by untwisting 50 cm of the coated elastic yarn under the load of 20 g, and the twist index represented by the higher value. Coated elastic yarn, and coated elastic yarn B is the coated elastic yarn with the lower twist index. }, and the calculation result is rounded off to the second decimal place.

[4] Transmission line when worn Wearing the stockings manufactured, one knit loop on the knee is taken out and cut, and the length of the transmission line after 5 flexion and extension exercises is measured. The value obtained by rounding off the second decimal point of the average of the places was used as the transmission line when worn.

[5] Cool sensation The cool sensation of the manufactured stockings was evaluated by the wearing test according to the following evaluation criteria.
Wearing environment: 30° C., 50% RH, almost no wind Indoor wear: Wearing only a T-shirt, shorts and stockings on a monitor, walking on a treadmill at 4 km/hr for 10 minutes, and the cool feeling during that time was judged by the following.
(Evaluation criteria)
Grade 5: Extremely cool Grade 4: Quite cool Grade 3: Cool as bare legs Grade 2: Slightly steamy Grade 1: Hot and want to take off

[6] Texture The texture of the manufactured stockings was evaluated according to the following evaluation criteria at the same time as [4] evaluation of the transmission line when worn.
(Evaluation criteria)
Grade 5: Smooth and extremely comfortable to wear Grade 4: Smooth and soft texture Grade 3: Soft texture Grade 2: A little rough 1st grade: Rough and extremely uncomfortable

[7] Quality The quality of the manufactured pantyhose was put on a leg-shaped torso, observed from a plurality of angles such as front and rear, up and down, and obliquely, and evaluated according to the following evaluation criteria.
(Evaluation criteria)
Grade: The weft is not noticeable at all, extremely high grade 4. Grade: Almost no weft, high grade 3: Slight weft but no problem Grade 2: Low grade, low grade 1 Grade: Weft Extremely low grade with extremely large steps

[Example 1]
In producing a pantyhose having a pants portion and a leg portion, elastic threads to be fixed were produced as follows.
A polytetramethylene ether glycol (PTMG) having a number average molecular weight of 2000 is reacted with 1.6 times equivalent of 4,4′-diphenylmethane diisocyanate (MDI) in a dry nitrogen atmosphere at 80° C. for 3 hours while stirring. Thus, a polyurethane prepolymer having an end capped with an isocyanate was obtained. After cooling this to room temperature, dimethylacetamide was added and dissolved to obtain a polyurethane prepolymer solution. On the other hand, a solution prepared by dissolving ethylenediamine (EDA) and diethylamine in dry dimethylacetamide was prepared and added to the prepolymer solution at room temperature to obtain a polyurethane solid content concentration of 30% by weight and a viscosity of 450 Pa·S (30° C.). Polyurethane urea hand coalescence solution PAI was obtained.

Separately, polytetramethylene ether glycol having a number average molecular weight of 2000 was reacted with 3.0 times equivalent amount of 4,4′-diphenylmethane diisocyanate under a dry nitrogen atmosphere at 80° C. for 3 hours with stirring, After forming a polyurethane prepolymer having an end capped with isocyanate, 1,4-butanediol (1,4-BD) was added to the prepolymer and reacted, and then heated at 80° C. for 16 hours to obtain a hardness of 80A. , A polyurethane compound having no endothermic peak in the temperature range from 80°C to the decomposition starting temperature (282°C) in DSC is obtained. Dimethylacetamide was added thereto to obtain a polyurethane solution PUI having a solid content concentration of 30% by weight.
The resulting polyurethane urea solution and polyurethane solution were mixed at PAI:PUI=80:20, and 4,4'-butylidene bis(31-methyl-6-t-butylphenol) was added to the same proportion of polyurethane urea and polyurethane. 1% by weight of 2-(2′-hydroxy-3′-t-butyl-5′-methylphenyl)-5-chlorobenzotriazole was mixed with 0.5% by weight of a polyurethane solution to form a uniform solution. After that, defoaming was performed under reduced pressure at room temperature to obtain a spinning dope. This spinning dope was dry-spun at a spinning speed of 800 m/min and a hot air temperature of 310° C., and the obtained polyurethane urea elastic yarn was wound up in a package, and as a finishing agent, polydimethylsiloxane 80% by weight, mineral oil 18% by weight % And magnesium stearate 2% by weight was applied to the polyurethane elastic yarn in an amount of 4% by weight and wound on a paper tube made of paper to obtain a polyurethane urea elastic yarn of 22 dt.
The 22 dt bare yarn of the polyurethane urea elastic fiber obtained above was coated with 13 dt/7 filament of nylon 66 raw yarn on a covering machine at 1400 T/m and a draft ratio of 3.0, and a coating containing an elastic yarn to be fixed. An elastic thread was obtained.

Next, an elastic yarn having excellent hygroscopicity was manufactured as follows.
Polytetramethylene glycol having a number average molecular weight of 1830 is reacted with 1000 parts by weight of 4,4′-diphenylmethane diisocyanate and 168.1 parts by weight while stirring at 65° C. for 1 hour in a nitrogen gas atmosphere, A medium vehicle merging having a terminal isocyanate was obtained. This intermediate polymer was dissolved in dried dimethylacetamide to a concentration of 60%. Then, a dimethylacetamide solution containing 14 parts by weight of ethylenediamine and 2.7 parts by weight of diethylamine was added to the severely damaged intermediate polymer solution to obtain a polyurethaneurea polymer solution having a concentration of about 35%.
This polyurethaneurea polymer solution was composed of polyethylene glycol having a number average molecular weight (hereinafter, represented by Mn) of 7,000, 1,4-butanediol, and 1,4′-diphenylmethane diisocyanate and had a water absorption of 1800% by weight. A urethane water-absorbent resin (Mn60000) was added and mixed at 25% by weight with respect to the polyurethane urea polymer. To this solution, an additive such as an antioxidant and a yellowing agent, that is, 1.5% by weight of an isobutylene adduct of a polyaddition product of p-cresol and dicyclopentadiene with respect to a polyurethane polymer, N,N -Bis(2-hydroxyethyl)-t-butylamine 2.5% by weight, 2-(2'-hydroxy-3',5-dibenzyl-phenyl)-benzotriazole 0.3%, magnesium stearate 0.05 % By weight was added to prepare a spinning dope for dry spinning. The solid content concentration of the whole spinning solution was adjusted to 35% by weight.
This spinning dope was supplied to a dry spinning machine having a hot air temperature of 240° C. and wound at a winding speed of 800 m/min to obtain a polyurethane urea elastic yarn of 22 dt.
A bare yarn 19 dt of the polyurethane urea elastic fiber obtained above was coated with 13 dtex/7 filaments of nylon 66 raw yarn on a covering machine at 1700 T/m and a draft ratio of 3.0 to coat an elastic yarn excellent in hygroscopicity. The coated elastic yarn used was obtained.

Next, using a pantyhose knitting machine with a shuttle diameter of 4 inches and a needle count of 352, knitting a textured fabric by alternating one of two types of coated elastic yarns, and using a steam set machine in a vacuum state at 100°C. After heat-moisture presetting with steam at 100° C. for 30 minutes, the crotch part and the toe part were sewn, dyed in beige under ordinary nylon dyeing conditions, dipped in a softening agent and dried. After drying, the pantyhose was punched in a leg-shaped mold, and the pantyhose was obtained by finishing and setting the wet heat at 110° C. for 30 seconds.
Using this pantyhose, the unraveling stress, the twisting index ratio, and the transmission line when worn were measured.As a result, there was almost no transmission line due to wearing, and it became a high-quality pantyhose without wefts, and the coated elastic yarn Due to its low fineness, it became cool pantyhose even when worn in hot environments. The results are shown in Table 1 below. In Table 1, the coated elastic yarn A is a coated elastic yarn having a high moisture absorption rate, and the coated elastic yarn B is a coated elastic yarn having a moisture absorption rate equal to or lower than A.

[Examples 2 to 4, Comparative Examples 1 and 2]
In Example 1, a pantyhose was manufactured under the same conditions as in Example 1 except that ordinary elastic yarn 22dtex (trade name: Loika CR: manufactured by Asahi Kasei Co., Ltd.) was used instead of the elastic yarn having excellent hygroscopicity. (Comparative example 1).
Further, in Example 1, as the non-elastic yarn that covers the elastic yarn 22dtex having excellent hygroscopicity, a highly hygroscopic nylon 13dtex (trade name: Cup: manufactured by Toray Industries, Inc.) is used. A pantyhose was produced in the same manner as in Example 1 (Example 2).
The evaluation results are shown in Table 1 below. The higher the moisture absorption rate of the covered elastic yarn, the more sufficient the sticking effect was obtained, and the pantyhose was hard to be transmitted by wearing.
Further, in Example 1, when the coated elastic yarn having a high moisture absorption rate was manufactured, only the number of twists was changed in the setting on the covering machine for coating the inelastic yarn, and 1800 T/m (Example 3) and 1900 T/m ( Example 4) was produced, and other conditions were the same as in Example 1, and pantyhose was produced and evaluated. The results are shown in Table 1 below. If the twisting index ratio is 1.30 or less, the panty hose is of high quality and the weft is inconspicuous.
In addition, in Example 1, both the preset and finish sets were heat set by dry heat (Comparative Example 2). The results are shown in Table 1 below. Even if a coated elastic yarn having a high moisture absorption rate is used, the unraveling stress is low under dry heat, and the effect of preventing wire transmission cannot be exhibited.

[Example 5]
In the coated elastic yarn produced in Example 1, the elastic yarn to be fixed was 22 dtex and the elastic yarn having excellent hygroscopicity was produced as 25 dtex, and the non-elastic yarn to be coated was made of nylon having high hygroscopicity (Cup: manufactured by Toray Industries, Inc.). ) As an 8 dtex/5 filament, the elastic yarn to be fixed is set to 1500 T/m on the covering machine and the draft rate is 2.8, and the elastic yarn having excellent hygroscopicity is set to 1600/m on the covering machine and the draft rate is 2.8. The coated elastic yarn was set and the panty hose was manufactured under the same conditions as in Example 1 except for the other conditions, and evaluated. The results are shown in Table 1 below.

[Example 6]
In producing the leggings, the elastic yarn 25dtex having excellent hygroscopicity produced in Example 5 and the nylon 33dtex/12 filament were set to 1800T/m draft rate 3.1 on the covering machine to produce a coated elastic yarn, On the other hand, the elastic yarn of 22 dtex produced in Example 5 was used as the elastic yarn to be fixed, and the nylon 33 dtex/12 filament was set to 1500 T/m draft rate 3.1 on the covering machine to produce the coated elastic yarn. Using a pantyhose knitting machine with a hook diameter of 4 inches and a needle count of 380, knit with a plain cloth structure by alternating one of two types of coated elastic yarns, and use a steam set machine at 100°C in a vacuum state to obtain 100°C. After 30 minutes of steam-heat pre-setting using steam, the crotch part and the toe part were sewn, dyed black under normal nylon dyeing conditions, dipped in a softening agent and dried. After drying, the leggings were punched into the leg-shaped mold, and the leggings were obtained by finishing and setting the wet heat at 110° C. for 30 seconds.
The results of evaluation of the obtained leggings are shown in Table 1 below, and the leggings were cool because the conductors and wefts were not conspicuous when worn.

INDUSTRIAL APPLICABILITY The tubular knitted fabric of the present invention is suitable for pantyhose, short stockings, leggings, etc., and can be used for arm covers, gaiters, etc., and is a product that is cool in a hot environment and hard to transmit.

a Change in unraveling stress b Peak value of unraveling stress (circle)
c Peak that is not judged as the peak value of unfolding stress (△ mark)

Claims (6)

A tubular knitted fabric containing two types of covered elastic yarns in which elastic yarns are covered with non-elastic yarns and knitted with a plain cloth structure, wherein at least one of the covered elastic yarns has a covered elasticity. The elastic yarn that constitutes the yarn is a fixed elastic yarn, the at least one type of coated elastic yarn is a coated elastic yarn having a moisture absorption rate of 3.5% or more, and the tubular knitted fabric is unknitted. A tubular knitted fabric having a stress of 2.0 cN or more. Among the two types of covered elastic yarns, one of the covered elastic yarns is an elastic yarn that is fixed, and the other elastic yarn that is formed of the covered elastic yarns is an unfixed elastic yarn. The tubular knitted fabric according to Item 1. The tubular knitted fabric according to claim 1 or 2, wherein each of the two types of coated elastic yarns has a fineness of 10 dtex to 45 dtex. The tubular knitted fabric according to any one of claims 1 to 3, wherein one of the two types of covered elastic yarns is knitted alternately. The following formula (1) of the two types of coated elastic yarns:
Twist index ratio=(twist index of coated elastic yarn A)/(twist index of coated elastic yarn B)...Equation (1)
{In the formula, the coated elastic yarn A is the following formula (2) among the two types of coated elastic yarns:
Twisting index=(number of twists when the coated elastic yarn is extended)×(length of elastic yarn constituting the coated elastic yarn after untwisting of the coated elastic yarn)/(the coating after untwisting of the coated elastic yarn) (Length of non-elastic thread constituting elastic thread)... Formula (2)
(In the formula, "the number of twists of the coated elastic yarn at the time of extension" is the number of twists of the coated elastic yarn at a length of 50 cm at a load of 20 g, and "the elastic yarn constituting the coated elastic yarn after untwisting""Length" is the length of an elastic yarn obtained by untwisting 50 cm of the coated elastic yarn under a load of 20 g, under a load of 0.02 g, and "constituting the coated elastic yarn after untwisting". "The length of the non-elastic yarn" is the length of the non-elastic yarn obtained by untwisting 50 cm of the coated elastic yarn under the load of 20 g, and the twist index represented by the higher value. Coated elastic yarn, and coated elastic yarn B is the coated elastic yarn with the lower twist index. } The tubular knitted fabric according to any one of claims 1 to 4, having a twist index ratio of 1.00 to 1.30. A stocking including the tubular knitted fabric according to claim 1.

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