WO2006027967A1

WO2006027967A1 - Elastic yarn having excellent handleability

Info

Publication number: WO2006027967A1
Application number: PCT/JP2005/015713
Authority: WO
Inventors: Ryoji Nakamura; Masumi Goto
Original assignee: Toyo Boseki Kabushiki Kaisha
Priority date: 2004-09-09
Filing date: 2005-08-30
Publication date: 2006-03-16

Abstract

This invention provides an elastic yarn which has a fracture elongation of 80 to 300% and, upon heat treatment, is brought to a fracture elongation of not less than 500% and an elongation recovery of not less than 50%. This yarn is prepared by heat setting a crosslinking-type polyolefin elastic fiber at a temperature of 60ºC or above while elongating the elastic fiber. This yarn can be brought to a flexible woven fabric by interlacing the yarn to prepare a woven fabric and heat treating the woven fabric at about 60 to 200ºC. There is also provided an elastic conjugated yarn which has an elongation of not more than 10% and, upon heat treatment, is brought to an elongation of not less than 30%. This yarn is prepared by heat setting a conjugated yarn comprising a crosslinking-type polyolefin elastic fiber and a nonelastic fiber at a temperature of 60ºC or above while elongating the conjugated yarn. This yarn can be brought to a flexible woven fabric by interlacing the yarn to prepare a woven fabric and heat treating the woven fabric at about 60 to 200ºC.

Description

Specification

Elastic yarn with excellent handleability

Technical field

[0001] The present invention relates to an elastic yarn excellent in handleability in a fabric-making process. Specifically, the elongation is low V, so that the fabric can be manufactured with excellent handleability and excellent stretchability. It relates to elastic yarn. The present invention also relates to such an elastic composite yarn.

Background art

[0002] Elastic yarns using polyurethane elastic fibers or urethane fibers (spandetus) are widely used in the clothing field and the like, and their uses are expanding year by year. In some cases, elastic yarn is used alone, but in order to improve tactile sensation, fabric surface gloss and color uniformity, core-sheath type composite spun yarn, force-balancing yarn, etc. in combination with non-elastic yarn Often used as a composite yarn (see, for example, Patent Documents 1 and 2).

However, since this elastic yarn has a high elongation rate, it is difficult to handle such as unnecessarily stretching during yarn production or weaving and knitting. For this reason, a warping machine with a positive yarn feeding device and a special knitting and weaving machine are necessary. However, even if these devices are used, handling and workability are still poor. Furthermore, this elastic yarn caused a large tension fluctuation due to a slight disturbance such as friction during the yarn manufacturing operation or the weaving operation, and this caused a deterioration in the appearance quality of products such as woven fabrics and knitted fabrics. The structure of the knitted fabric has been devised as a means of maintaining good quality of the product fabric (see, for example, Patent Document 3), but the product configuration is limited to maintain the quality of the fabric, and the quality improvement effect is sufficient. Then I helped. Also, since conventional elastic yarns have high elongation and high shrinkage force, increasing the hardness of the package around which the yarn is wound increases the elongation rate of the yarn outside the knockage, and the release of the knockage force is poor. Therefore, it was necessary to wrap it in software (see, for example, Patent Document 4). As a result, the winding shape and the tension of the thread at the time of release are unstable, and at the time of release, a loop or traversing occurs, that is, the wound thread of the outer layer falls off from the package, resulting in poor quality of the thread and the fabric. There was a fear.

Patent Document 1: JP 2001-355138 A Patent Document 2: JP 2004-36016 A

Patent Document 3: Japanese Patent Laid-Open No. 10-158905

Patent Document 4: JP-A-7-61708

Disclosure of the invention

Problems to be solved by the invention

[0004] The first object of the present invention is to provide an elastic yarn that can produce a fabric that exhibits good stretchability and recoverability as well as good handleability in the yarn and fabric production process.

[0005] A second object of the present invention is to provide such an elastic composite yarn.

Means for solving the problem

[0006] As a result of intensive investigations to solve the above problems, the present inventors have obtained the following knowledge.

(0 An elastic yarn having a breaking elongation of 80 to 300%, a breaking elongation after heat treatment of 500% or more, and a recovery rate of elongation of 50% or more is handled during yarn production and fabric production. It is easy to obtain a fabric having excellent stretchability by heat-treating the fabric after production.

(ii) The cross-linked polyolefin elastic yarn is heat-set at 60 ° C. or higher while being stretched to obtain an elastic yarn having the above characteristics.

(iii) For elastic composite yarns, when the elongation rate is 10% or less and the elongation rate is 30% or less by heat treatment, handling during yarn production and fabric production is easy, and after production A fabric having excellent stretchability can be obtained by heat-treating this fabric.

[0007] The present invention has been completed based on the above findings, and provides the following elastic yarn and elastic composite yarn.

Item [0008] An elastic yarn having a breaking elongation of 80 to 300%, a breaking elongation of 500% or more, and an elongation recovery rate of 50% or more by heat treatment.

[0009] Item 2. The material force including cross-linked polyolefin. The elastic yarn according to Item 1.

[0010] Item 3. A fabric comprising the elastic yarn according to Item 1.

Item 4. A method for producing a stretchable fabric, wherein a stretchable fabric is obtained by heat-treating the fabric according to Item 3. [0012] Item 5. The method according to Item 4, wherein the heat treatment is heat treatment at 60 to 200 ° C. for 1 to 60 minutes.

[0013] Item 6. A method for producing an elastic yarn, comprising the step of heat-setting the crosslinked polyolefin elastic yarn at 60 ° C. or higher while stretching or after stretching.

[0014] Item 7. The method according to Item 6, wherein the film is elongated at an elongation rate of 100 to 450%.

[0015] Item 8. The method according to Item 6, wherein the heat setting is performed for 0.03 seconds to 1 minute.

[0016] Item 9. A composite composite yarn having an elongation rate of 10% or less and an elongation rate of 30% or more by heat treatment.

[0017] Item 10. The elastic composite yarn according to Item 9, comprising an elastic fiber and a non-elastic fiber made of a material containing a cross-linked polyolefin.

[0018] Item 11. A fabric comprising the elastic composite yarn according to Item 9.

Item 12. A method for producing a stretchable fabric, which obtains a stretchable fabric by subjecting the fabric according to Item 11 to a heat treatment.

[0020] Item 13. The method according to Item 12, wherein the heat treatment is a heat treatment at 60 to 200 ° C. for 0.5 to 60 minutes.

Item 14. Manufacture of an elastic composite yarn comprising a step of heat-setting a composite yarn comprising a crosslinked polyolefin elastic fiber and a non-elastic fiber at 60 ° C. or higher while the elastic fiber is stretched or stretched Method.

[0022] Item 15. The method according to Item 14, wherein elongation is performed at an elongation rate of 100 to 450%.

[0023] Item 16. The method according to Item 14, wherein the heat setting is performed for 0.03 seconds to 60 minutes.

The invention's effect

[0024] The elastic yarn and the elastic composite yarn of the present invention have a moderately low elongation at which the tension change of the yarn is small when the yarn is unwound during knitting and weaving. For this reason, it is easy to handle and the manufacturing process is easy to manage. In addition, since the yarn does not easily cause a difference in yarn length due to tension, the yarn has a small difference in stretch rate between the inner yarn and the outer yarn of the package, so that a fabric having a uniform width can be obtained. In addition, elasticity develops for the first time in a process involving heating, such as a dyeing finishing process, and a fabric having sufficient stretchability is obtained.

[0025] In addition, the fabric produced from the elastic yarn and elastic composite yarn of the present invention is prone to sag with use. However, the stretchability is restored by heat treatment.

BEST MODE FOR CARRYING OUT THE INVENTION

[0026] m bullet thread

The present invention will be described in detail below.

[0027] The elastic yarn of the present invention is a yarn having a breaking elongation of about 80 to 300%, a breaking elongation of 500% or more, and an elongation recovery rate of 50% or more by heat treatment. The elastic yarn may be a monofilament yarn or a multifilament yarn.

[0028] The heat treatment is a boil treatment for 60 minutes under no load or slight load in boiling water.

[0029] The elongation at break of the elastic yarn of the present invention is preferably about 80 to 250%, more preferably about 80 to 200%. Within the above range of elongation at break, permanent deformation hardly occurs after stretching, and subsequent shrinkage due to heat treatment is difficult to be suppressed by permanent strain. As a result, good elongation and stretch recovery are obtained in the heat-treated fabric, and yarn breakage is less likely to occur in the fabric-making process where partial breakage of the fabric is unlikely to occur during elongation heat setting. In addition, within the above-mentioned breaking elongation range, a special device such as a tension adjuster or an active yarn feeding device, which makes it difficult to change the length of the elastic fiber due to tension fluctuation during the fabric manufacturing process, is used. Even when supplied to a fabric preparation machine or a knitting weaving machine, a fabric of good quality can be obtained.

[0030] The elongation at break after heat treatment of the elastic yarn of the present invention is preferably 600% or more. The upper limit of the breaking elongation is not particularly limited, but is usually about 800%. Within the above range of breaking elongation, the stretchability of the fabric obtained by the heat treatment is sufficient, the elongation stress is reduced, and sufficient recovery performance and, in turn, excellent shape stability are obtained.

[0031] The elongation recovery rate after heat treatment of the elastic yarn of the present invention refers to the recovery rate after 300% elongation, and is specifically a value measured by the method described in the examples. The elongation recovery rate after the heat treatment is preferably 70% or more. The upper limit of the elongation recovery rate after the heat treatment is not particularly limited, but is usually about 80%. Within this range, a fabric having practical stretch properties can be obtained by heat treatment.

[0032] The elastic yarn of the present invention includes, but is not limited to, a crosslinked polyolefin fiber. And the like.

[0033] Cross-linked polyolefin is a fiber obtained by subjecting a substantially linear olefin to a cross-linking treatment, and has a substantially uniform branch with respect to the main chain. Such a cross-linked polyolefin is polymerized with an olefin monomer and then chemically cross-linked using, for example, a radical initiator or a coupling agent, or an energy beam such as an electron beam, j8 ray, or γ ray. It can be obtained from the cross-linking from the irradiation. The cross-linking method is preferably cross-linking by irradiation with energy rays in consideration of the stability after it has become a product.

[0034] The degree of cross-linking is preferably 40% by weight or less (ie, the gel content of 30% by weight or more) (ie, the gel content of 30% by weight or more) measured by ASTM D-2765, for example. More preferably, the gel content is 60% by mass or more.

[0035] Examples of olefins include ethylene. Specific examples of the cross-linked polyolefin include a cross-linked low density polyethylene copolymerized with α-olefin, and a cross-linked polyolefin described in JP-T-Heisei 20 02-515530. Crosslinked polyolefin elastic fibers have excellent stretchability, chemical resistance, weather resistance, and heat resistance due to the crosslinked structure.

[0036] The elastic yarn of the present invention can be obtained by, for example, heat setting a yarn having a cross-linked polyolefin fiber strength. In the present invention, heat setting refers to heat treatment while stretching, and heat treatment after stretching.

Specifically, a cross-linked polyolefin-based reinforcing yarn is usually obtained by winding a polyolefin fiber as a monofilament or a multifilament by a melt spinning method and subjecting it to a cross-linking treatment. The elastic fiber of the present invention can be obtained by stretching this elastic fiber and heat-setting at 60 ° C. or higher, preferably 80 ° C. or higher, which is the melting point of the crosslinked polyolefin crystal. This heat setting treatment may be carried out after crosslinking, but if online crosslinking is possible, it is possible to carry out continuous treatment following the crosslinking on the spinning line.

[0038] The heat setting temperature may be a temperature lower than the melting temperature of the fiber so that the fiber does not deteriorate. Since the fusing temperature of the crosslinked polyolefin fiber is about 220 ° C, the temperature may be lower than that, for example, 180 ° C or less. Since a cross-linked structure is introduced into polyolefin, it can be heat-treated at a temperature higher than the crystalline melting point of polyolefin. [0039] The heat setting temperature is the yarn temperature, and the heating temperature may be determined according to the processing speed and the length of the calorific heating device so that the yarn temperature falls within the above range. The heating method does not matter whether it is dry heat or wet heat, but if there are combined materials, the method that is usually used can be adopted. For example, wet heat may be used when used in combination with cotton fibers, and dry heat may be used when used with polyester fibers. In addition, since the cross-linked polyolefin elastic yarn has high frictional resistance with metals, non-contact heating devices are preferred for uniform processing.

[0040] The heat treatment time may be about 0.03 to 1 minute.

[0041] The elongation percentage is determined by the elongation of the elastic yarn after crosslinking. Usually, an elastic yarn having a breaking elongation of 80 to 300% can be obtained by stretching about 2 to 5.5 times (100 to 450%). For example, in order to obtain the most common 600% elastic yarn, it may be stretched by about 2 to 4.5 times. This heat setting may be performed by a heating roller, but in this case, it is desirable to remove the tension after cooling sufficiently and then wind it around the package. It can be rolled up into a package while being stretched and batch-heat treated in the form of cheese. However, since partial adhesion may occur during heating and release may be impaired, it may be heat-set as a composite yarn covered with non-elastic fibers. preferable.

[0042] The elastic fiber of the present invention can be produced by weaving and knitting alone or in combination with different types of yarn. As described above, the elastic fiber of the present invention is a yarn in a temporarily set state, and can be woven or knitted in a temporarily set low-stretch state, so that it can be handled as easily as an inelastic yarn. Although this fabric is poor in stretchability, it becomes a fabric excellent in stretchability by performing heat treatment at, for example, about 60 to 200 ° C, preferably about 100 to 180 ° C for 1 to 60 minutes. The heat treatment is usually performed in the scouring process or the dyeing process of the fabric.

(Π) Ammunition Joint Yarn

The elastic composite yarn of the present invention is a yarn having an elongation rate of 10% or less and an elongation rate of 30% or more by heat treatment.

[0043] The elongation percentage is preferably 5% or less. The lower limit of the elongation rate is not particularly limited, but is usually about 1%. Within the range of the above-mentioned elongation rate, it becomes easy to handle in the knitting weaving preparation process, specifically the warping process, and is not easily affected by disturbances such as friction that easily occur in the subsequent process. As a result, the fabric manufactured with this elastic composite yarn has good quality. In addition, if it is within the above range, it becomes easy to knit during knitting, and the winding hardness of the yarn tube is moderate, so that steam at the time of setting easily penetrates. The set is performed uniformly with the outer yarn.

[0044] The heat treatment includes boiling for 30 minutes under no load or slight load in boiling water.

[0045] The elastic composite yarn of the present invention exhibits elasticity by heat treatment. The elongation after the heat treatment is preferably 40% or more, more preferably 50% or more. The upper limit of the elongation after the heat treatment is not particularly limited, but is usually about 100%. If it is the range of the said elongation rate, the fabric which has practically sufficient stretch performance will be obtained.

[0046] The elastic composite yarn of the present invention may be a composite yarn containing elastic fibers and non-elastic fibers. Examples of the elastic fiber include, but are not limited to, a crosslinked polyolefin elastic fiber. The cross-linked polyolefin fiber exhibits stretchability by heat treatment. In addition, when making a composite yarn with cotton fiber, a chloride bleaching process may be performed to obtain the whiteness and soft texture of the cotton in the dyeing finishing process, and when making a composite yarn with polyester fiber. May be subjected to alkali weight loss processing, but the cross-linked polyolefin fiber is an elastic fiber having chemical resistance, and has an advantage that it can withstand such a post-processing step.

[0047] The cross-linked polyolefin fiber is as described above. Cross-linked polyolefin fibers can be used singly or in combination of two or more.

[0048] The material of the inelastic fiber is not particularly limited. For example, natural fibers such as cotton fiber, hemp fiber, kenaf fiber, natto fiber, soy protein fiber, wool fiber, silk fiber, cashmere fiber, mohair fiber; rayon fiber, cubra fiber, acetate fiber, promix fiber, polymilk Examples include acid fibers, polyester fibers, polyamide fibers, polyolefin fibers, vinylon fibers, and chemical fibers such as acrylic fibers. Inelastic fibers can be used singly or in combination of two or more.

[0049] In general, facilities for handling elastic yarns are designed to reduce friction with the yarn in order to suppress fluctuations in tension, but facilities for handling inelastic yarns are mostly supplemented by such designs. Not done. When weaving and knitting the elastic yarn of the present invention in a facility that handles non-elastic yarn In some cases, the exposed elastic fibers contact with the equipment, increasing the tension of the composite yarn, which may impair the quality of the fabric. Therefore, the form of the elastic composite yarn of the present invention is preferably a composite spun yarn with an inelastic body fiber or a canopy ring yarn in which an elastic yarn is ringed with an inelastic filament.

[0050] Among them, the composite yarn of the present invention is preferably a composite spun yarn using a cross-linked polyolefin fiber for the core and a short fiber such as cotton for the sheath. Cano rings using cross-linked polyolefin fibers for the core and polyester filament yarns, polyamide filament yarns, semi-synthetic fiber filaments such as polyolefin filaments and acetate, or bulky processed yarns of these, for the sheath Yarn is also preferred. In the case of composite spun yarn and canopy ring yarn, the core-sheath material can be reversed if necessary.

[0051] In the case of covering yarn, the coverage is preferably 40% or more, more preferably 60% or more. The frictional resistance can be made sufficiently low within the above-mentioned coverage range. Considering the use ratio of elastic yarn, the upper limit of the coverage is usually about 95%. The coverage is almost the same as the value expressed by Equation (1).

[0052] T'F 'd X lO— ³ · · · (1)

In the formula (1), T is the number of times of canoring (TZm), F is the number of wound inelastic filament yarns, and d is the fineness (denier) of the single yarn of the inelastic filament yarns.

[0053] When the value represented by the formula (1) exceeds 100, the covering yarn is a non-elastic filament yarn wound around the elastic yarn in two or more layers. Accordingly, the coverage of the canoring yarn can be adjusted by the fineness of the inelastic filament yarn used and the number of times of canoring.

[0054] The coverage of composite spun yarn can be defined in substantially the same manner, but the degree of coating is often expressed by the blending rate of elastic yarn and the twist coefficient. The mixed power factor can be calculated from the number of coated fibers. In addition, the twist coefficient (K) is calculated using the formula (2)

K = TPIZ Ne (2)

(Where TPI is the number of twists per inch and Ne is the cotton count of the spun yarn)

It is a value expressed by and is an index representing the number of twists per fixed length.

[0055] The coverage of the composite spun yarn can be calculated by using the mixture rate of the elastic yarn, the yarn count, the twist coefficient, and the fiber diameter of the short fiber. However, in the case of composite spun yarn, the elastic yarn is mixed. Under general conditions where the utilization rate is 30% or less, the coverage rate is usually 100% or more, and no special attention is required.

[0056] The elongation rate after the heat treatment depends on the constituent ratio of the elastic fiber in the composite yarn and the binding force of the inelastic yarn.

[0057] The mixing ratio of the elastic yarn in the composite yarn is preferably 20% or less, more preferably 15% or less.

The lower limit of the mixture ratio of elastic yarn is usually about 10%. Within the above range, a composite yarn having an elongation rate of 10% or less and an elongation rate of 30% or more by heat treatment can be obtained. Further, within the above range, since the degree of exposure of the crosslinked polyolefin fiber in the composite yarn is small, it is possible to produce a high-quality fabric having a low frictional resistance and having a sufficient stretch performance. .

[0058] The binding force of the inelastic yarn mainly depends on the number of twists of the composite yarn. The twist coefficient of the composite yarn is preferably 4.5 or less for the spun yarn and 9000 or less for the covering yarn. The lower limit of the twist coefficient is usually about 3.5 for spun yarn and about 4000 for canoring yarn. If it is in the above range, the elastic composite yarn having an elastic yarn binding force of inelastic yarn and an elongation rate of 10% or less and an elongation rate of 30% or more by heat treatment by heat setting described later. Is obtained. Moreover, if it is the said range, even when it is a case where it uses for the warp of a textile fabric, favorable ironing resistance is shown.

[0059] In addition, there is a limit to the upper limit of the fabric density of the raw machine due to the design of the weaving and knitting. If the raw machine density is too low, the fabric will shrink too much due to heat treatment, resulting in a thick and low elastic recovery rate fabric. Fabrics with a rate of up to 50% cannot be obtained. In addition, because there is an upper limit on the density of raw machinery, even if stretchability is manifested by heat treatment, the stretch rate can only be obtained up to about 100%, but with this stretch rate, stretch performance can be fully demonstrated. . If the elongation is too high, the fabric thickness becomes too large.

[0060] By heat setting the above composite yarn, the elastic composite yarn of the present invention having an elongation of 10% or less can be obtained.

[0061] For example, the finely spun composite yarn can be set under wet heat conditions in a state of being wound around a yarn tube. Sufficiently penetrate the steam to the inner layer of the thread wound around the thread tube, In order to reduce the difference in the set conditions between the inner layer yarn and the outer layer yarn, and in order to control the temperature uniformly by supplying steam after depressurization in the pressure cooker

The heat setting temperature should be 60 ° C or higher, preferably 80 ° C or higher. The temperature can be raised to about 130 ° C under pressure, but in order for the resulting elastic composite yarn to exhibit sufficient elasticity by heat treatment in the scouring process or dyeing process, the temperature is 95 ° C or less. 90 ° C or less is preferable.

[0062] The heat treatment is preferably performed for 0.03 seconds to 60 minutes.

[0063] By performing the wet heat setting, a temporary setting for temporarily reducing the elastic fiber stretchability can be performed. In addition, if the twist setting is performed in addition to the temporary setting at the time of wet heat setting, handling of the yarn becomes easy in the next process.

[0064] The elastic composite yarn containing the cross-linked polyolefin elastic fiber has a very small shrinkage stress generated during wet heat setting. Since conventional elastic composite yarns have a large shrinkage stress, force that requires a moist and heat resistant bobbin other than paper such as bakelite or aluminum is required for wet heat setting. The crystalline melting point of bridge-type polyolefin elastic fiber is about 60 ° C. Since the shrinkage stress is reduced by releasing a part of the network due to the melting of the low crystals, the paper tube used in the conventional method can be used for the covering yarn.

[0065] Since the restraint point due to the crystal recombines at room temperature, there is no problem because the elastic characteristics during use at room temperature are maintained. Thereafter, the spun yarn is wound around the cheese while removing the defects, and the knuckling ring yarn is directly subjected to the weaving and knitting process.

[0066] In addition, it is preferable that the heat set is a steam set from the viewpoint that the conventional equipment can be diverted, but a dry heat set can also be used. A dry heat set can also be incorporated into the composite yarn manufacturing process.

[0067] A composite yarn can also be produced by combining an elastic fiber that has been previously stretched and set with dry heat or wet heat with an inelastic fiber without stretching. In order to reduce the production cost, it is preferable to reduce the stretchability by heat setting after making the composite yarn.

[0068] The elongation during heat setting is preferably about 100 to 450%, more preferably about 250 to 350%. Within the above-mentioned range of elongation, the set yarn has a sufficiently low elongation and is easy to handle, and the set yarn does not become too low in the knitting and weaving process. It becomes.

[0069] The composite elastic fiber of the present invention can be produced by weaving and knitting alone or in combination with different types of yarn. As described above, the elastic fiber of the present invention is a yarn in a temporarily set state, and can be woven and knitted in a temporarily set state with low stretchability. This fabric becomes a fabric excellent in stretchability by performing a heat treatment at about 60 to 200 ° C., preferably about 80 to 190 ° C. for 0.5 to 30 minutes. The heat treatment is usually performed in a scouring process or a dyeing process of the fabric.

Example

Hereinafter, the present invention will be described in more detail with reference to examples, but the present invention is not limited thereto.

Bullet thread

Various characteristics of the elastic yarn of the present invention were evaluated by the following methods.

The elongation at break was measured with a TENSILON type elongation tester under the conditions of gauge length = 50 mm, stretching speed = 500 mmZ min, recording paper speed = 200 mmZ min, with an initial load of 0.9 mgZdtex. The average value of three measurements was adopted.

<No 沏 I

TENSILON type elongation tester, gauge length = 50mm, stretching speed = 500mmZ minutes, recording paper speed = 200mmZ minutes, initial load was 0.9mgZdtex, yarn was stretched to 300%, and momentarily 500mmZ minutes It returned to the original direction at the speed of. Elongation recovery rate was calculated by the following formula, assuming that the gauge length at which stress becomes 0 is L1 and the gauge length before elongation is L0.

[0070] Recovery rate = {(4.L0— L1) Z (3 'L0)} X 100 (%)

Example 1 1

A monofilament cheese of 44dtex cross-linked polyolefin fiber (DOW XLA manufactured by Toyobo Co., Ltd.) with a breaking elongation of 600% is placed on a pair of rollers, and the yarn is unwound in the circumferential direction of the package while rotating the knock. 1.Supply to the feed roller under a draft of 3 times, while the yarn is stretched 1.92 times between the feed roller and the draw roller, A contact-type slit heater (heater length = 500 mm) was heat-set at 140 ° C and wound around a draw roller at a speed of 97.5% of its surface speed (300 mZ min). The heat set time was about 0.1 second. The elongation rate during heat setting was about 2.5 times. The shape of the wound package was good.

[0071] Table 1 shows the evaluation results of the breaking elongation, breaking elongation after boiling water treatment, and elongation recovery rate of the obtained yarn.

[0072] Nylon-processed yarn (Toyobo Co., Ltd., baller) 44dtexl0 filament was knitted with a 20-inch diameter santo-type 28 gauge circular knitting machine, and a milled knitted fabric with 8% elastic yarn mixing ratio Got. At this time, the elastic yarn does not actively feed (that is, the package is rotated in the unwinding direction on the roller), and the yarn is left in the same direction as the nylon-processed yarn, leaving the yarn in the direction of the package axis. The unwinding method was used, but the innermost thread of the cheese was released smoothly. Further, the obtained knitted fabric had no knitting steps and a uniform knitted fabric was obtained. When this knitted fabric was scoured in a conventional bath at 90 ° C for about 30 minutes, the knitted fabric width shrunk to 60%, and a knitted fabric suitable for underwear with high quality and high elasticity was obtained. .

Example 1 2

In Example 1, a monofilament of 156 dtex (DOW XLA) manufactured by Toyobo Co., Ltd. was used in place of the monofilament of crosslinked polyolefin fiber 44 dtex having a breaking elongation of 600% in Example 1. Then, an elastic yarn was obtained in the same manner as in Example 1 except that the total draft ratio (elongation rate at the time of heat setting) was about 4.5 times. The shape of the wound package was good. Table 1 shows the evaluation results of the breaking elongation, breaking elongation after boiling water treatment, and elongation recovery rate of the obtained yarn.

[0073] A rough yarn made of cotton fibers having an average fiber length of 26 mm was drafted 48 times between the front roller and the back roller, and at the same time, the cross-linked polyolefin fiber drawn and set as described above was tensioned on the front roller. The product was supplied without drafting, and was twisted into a spinning cup under a tension of 70 g with a twisting coefficient of 4.2, and a 12-cotton core-sheath type composite spun yarn was obtained. It was possible to release smoothly to the innermost layer. The mixture ratio of cross-linked polyolefin fiber was 7.9%.

[0074] This spun yarn was set (steamed) at 70 ° C for 15 minutes. 540 of this spun yarn The ropes are put together in a rope shape and run in parallel, and are dipped in a dyeing bath with an indigo dye bath concentration of 3 gZ liters for 30 seconds using a conventional rope dyeing machine. Since it takes time, it is squeezed so that there is no stain, and the dyeing is performed by performing 8 cycles of air ring for acid and soot for 2 minutes, then washing, oiling, and drying. A rope-like product dyed with indigo rope by drying and pasting was obtained. This was split. At this time, the rope-like composite elastic yarn could be split smoothly with almost no stretch. The 12th yarn of pre-dyed cotton yarn was driven into the warp yarn obtained by the splitting as a weft, and scouring was carried out in a bathtub at 85 ° C for 20 minutes in the usual manner. This fabric is a high-quality fabric that stretches in the vertical direction and is suitable for stretch jeans.o

Comparative example 1 1

In Example 1-1, monofilament of cross-linked polyolefin fiber 44dtex (DOW XLA manufactured by Toyobo Co., Ltd.) having a breaking elongation of 600% was fed without stretching heat setting, and a compensator was installed on the machine. A knitted fabric was obtained in the same manner as in Example 1 except that the tension was applied and stretched 2.5 times and fed to the knitting machine. When the obtained knitted fabric was scoured by a conventional method in a bathtub at 90 ° C for about 30 minutes, the knitted fabric width shrunk to 68%, and a knitted fabric suitable for underwear with high elasticity was obtained. When the yarn was drawn up, the stretchability was great and handling was extremely difficult. Unevenness occurred during knitting, resulting in a lot of unevenness due to the knitting step, resulting in a knitted fabric with poor quality.

Table 1 shows the evaluation results of the breaking elongation, the breaking elongation after boiling water treatment and the elongation recovery rate of the crosslinked polyolefin fiber used in Comparative Example 11.

Comparative example 1 2

A knitted fabric was obtained in the same manner as in Example 1, except that the crosslinked polyolefin fiber DOW XLA monofilament was stretched and heat set to 5.5 times, wound and fed without being stretched. When the obtained knitted fabric was scoured by a conventional method in a bathtub at 90 ° C. for about 30 minutes, the knitted fabric width contracted to 38%, and a knitted fabric suitable for underwear having high stretchability was obtained. The resulting knitted fabric, which has no problem in handling during knitting, was a well-balanced knitted fabric. However, the knitted fabric was broken during knitting, and worm-feeding defects were found in the finished knitted fabric. [0076] Table 1 shows the evaluation results of the breaking elongation, the breaking elongation after boiling water treatment, and the elongation recovery rate of the crosslinked polyolefin fibers used in Comparative Example 1-2.

Comparative example 1 3

In Example 1-1, instead of the crosslinked polyolefin fiber 44dtexDOW XLA monofilament, a polyurethane elastic yarn 44dtex obtained by reacting a polyol, diisocyanate, a strong polymer and a low molecular diol (ESPA M manufactured by Toyobo KK) A knitted fabric was obtained in the same manner as in Example 1 except that was used. Yarn is easy to handle during knitting, and the resulting knitted fabric is well-balanced.However, when the obtained knitted fabric is refined in a bathtub at 90 ° C for about 30 minutes in the usual way, The knitted fabric width was shrunk only to 92%, and a knitted fabric with inferior elasticity was obtained.

[0077] Table 1 shows the evaluation results of the elongation at break, the elongation at break after boiling water treatment, and the elongation recovery rate of the elastic fiber used in Comparative Example 13. Example 11 The strength of monofilament of cross-linked polyolefin fiber 44dtex (DOW XLA) used in 1 was produced at a spinning speed of 600 m / min. In this example, the same cross-linked polyolefin was used and the spinning speed was 1000 m / min. A crosslinked polyolefin fiber having a breaking elongation of 278% was used. Further, this yarn was supplied to the knitting machine without being stretch-set. Otherwise, a knitted fabric was obtained in the same manner as in Example 11. When the obtained knitted fabric was scoured by a conventional method in a bathtub at 90 ° C. for about 30 minutes, the knitted fabric width contracted to 41%, and the knitted fabric was highly stretched. However, the recovery at the time of elongation was poor, and it was poor in quality that some slack occurred after the elongation.

Table 1 shows the evaluation results of the elongation at break, the elongation at break after boiling water treatment, and the elongation recovery rate of the elastic fiber used in Comparative Example 14.

[0078] [Table 1] Elongation before treatment Elongation after treatment Elongation recovery

Example 1-1 154¾ 645¾ 78¾

Example 1-2 85% 520¾ 82¾

Comparative Example 1-1 600¾ 720¾ 80¾

Comparative Example 1-2 70% 500¾ 85¾

Comparative Example 1-3 145¾ 198¾ 89¾

Comparative Example 1-4 278¾ 510¾ 42¾

[0079] (II) Bullet composite yarn

Evaluation of this invention was implemented with the following method.

Using a wrap reel with a circumference of lm, create a force of 8 windings, and apply a load of 0. Olg to the fineness of the core yarn (fineness before drafting during compounding) (decitex) The cut length was measured after 1 minute and was defined as A (mm). Next, a weight of 0.lgZ composite yarn (decitex) was applied, and the force length after 1 minute was measured to obtain B (mm). Next, the skin was wrapped in gauze under no load, fixed with a clip, placed in boiling water, and treated for 30 minutes. After treatment, leave at room temperature for 1 hour or longer, remove the gauze, air dry for 1 hour, apply 0. OlgZ composite yarn fineness (decitex) again, measure the leaning length, and measure C (mm ). Next, the load was removed, and a load of 0.1 lgZ composite yarn fineness (decitex) was newly applied, and the skein length after 1 minute was measured to obtain D (mm). The elongation rate of the composite yarn before and after heat treatment was determined from the following formula.

[0080] Yield rate of yarn before heat treatment = {(B— A) ZA} X 100 (%)

Yarn elongation after heat treatment = {(D— C) ZC} X 100 (%)

Example 2— ί

A monofilament of cross-linked polyolefin fiber 44 decistats (DOW XLA manufactured by Toyobo Co., Ltd.) is drafted 48 times between the front roller and the back roller. Was drafted 3.5 times and supplied to the front roller, and the twist coefficient was set to 3.5, and it was wound into a spinning cup under a tension of 36 g to obtain a core-sheath type composite spun yarn with 40 cotton counts. The mixing ratio of the crosslinked polyolefin fiber was 8.6% by weight. The spun yarn was set for 15 minutes at 70 ° C with an elongation of 3.5 times. Elongation rate of this yarn Is shown in Table 2 below.

[0081] Using this composite spun yarn for warp and weft, warp yarns were arranged at a density of 90 Z inches, and weft yarns were arranged at a density of 70 Z inches to obtain a plain weave fabric. At the time of warp pasting and warping, it was handled in the same way as ordinary 100% cotton spun yarn, but it could be handled easily with no particular problems. The fabric was baked, desized, scoured, bleached, and mercerized in the normal continuous finishing process, and set at 170 ° C by stretching 3% in the width direction and 5% in the warp direction. Lastly, sunholization was performed. Bleaching was performed at 95 ° C for 45 minutes with 35 gZ liters of sodium chlorite (25%). Elasticity was developed by heat treatment in a series of steps of desizing, scouring, and bleaching. The resulting woven fabric was extremely excellent in quality, had a high degree of whiteness, had a soft touch, and had a high-class feeling with excellent stretchability and recoverability in the background. When this fabric was used to sew a dress shirt, a shirt with high gloss and excellent stretchability was obtained.

Example 2— 2

Draw a rough yarn made of cotton fibers with an average fiber length of 26 mm 48 times between the front roller and the back roller, and 4.0 times the monofilament of cross-linked polyolefin fiber 156 dtex (DOW XLA manufactured by Toyobo Co., Ltd.) 4.0 times The draft was fed to the front roller, and the twist coefficient was set to 3.5, and it was wound into a spinning cup under a tension of 70 g to obtain a core-sheath type composite spun yarn with 12 cotton counts. The mixture ratio of cross-linked polyolefin fiber was 7.9%. The spun yarn was set at 70 ° C for 15 minutes. Table 2 shows the elongation of this yarn.

[0082] 540 of these spun yarns are combined into a rope shape, and 12 of them are run in parallel, and are immersed in a dyeing bath with an indigo dyeing bath concentration of 3 gZ liters for 30 seconds by a known rope dyeing machine. After squeezing and acid ring for 2 minutes for 1 cycle, each was dyed by 8 cycles, then washed, oiled, dried, glued and dried to obtain an indigo rope dyed mouthpiece . This was divided into warps. At this time, the rope-like composite elastic yarn was split smoothly without any stretch, and could be glued and warped easily.

[0083] As the weft, a composite spun yarn obtained by composite spinning in the same manner as the warp yarn was used. The blending ratio of cross-linked polyolefin fiber in this yarn was 10.5%. The spun yarn was set at a stretch rate of 4.0 times at 70 ° C for 15 minutes. Table 1 shows the elongation before and after the treatment of this yarn.

[0084] Weaving with 2/1 left twill, with a warp density of 47 Z inches and a weft density of 36 Z inches It was. Weaving could be done without the need for a special breading device with a small width. Further organizing was carried out. In scouring, weft was inserted in the warp direction, and was inserted by sanforice and processing before final finishing. Stretching was manifested by heat treatment (90 ° C for 30 minutes) during the scouring and sanforization process.

[0085] Jeans pants were sewn using this fabric, and 1 part of the indigo dye was acid-decolorized using sodium hypochlorite and a sash. The resulting product was extremely excellent in quality, soft and bi-directional, and comfortable to wear. In addition, it became jeans pants with a worn out appearance.

[0086] When wearing this jeans pants for a week, a part of the knee part was pulled out and a slight amount of protrusion was raised, but when the iron of 140 ° C was applied, the swollen part contracted and the original size Returned to. The same effect was obtained when washing and tumble drying at 80 ° C.

Example 2-3

Cross-linked polyolefin elastic yarn 44 dtex (DOW XLA manufactured by Toyobo Co., Ltd.) is tripled, while polyester flat yarn (flatness = 4.8) 48 dtex 36 filament yarn (Toyobo Polyester polyester) is used in the S direction. The yarn was covered with lOOOTZm (twisting coefficient: 6600), wound up in a stretched state, and set at 15 ° C for 15 minutes at a stretch rate of 3 times. Table 2 shows the elongation ratio of this composite yarn before and after heat treatment.

[0087] This composite yarn was replaced with the above polyester flat yarn (flat rate = 4.8) 48 decitex 36 filament yarn, 2 heater false twisting yarn, one by one, 16 inch 19G rubber knitting machine And the loop length was set to 580mmZlOO wale, and the knitted fabric was obtained. At the time of knitting, the force of handling composite yarn equivalent to false twisted yarn was the same as that of false twisted yarn, and the knitting tension was almost the same as false twisted yarn, and no abnormal stage with almost no change in release tension was observed. .

[0088] After scouring this knitted fabric at 95 ° C for 45 minutes in a conventional manner, it was used as a garment in the form of a cylinder, and sewn with a separately cut sleeve to make a women's underwear. The result was a thin, high quality underwear that was extremely superior in quality and stretchable.

Example 2— 1

A woven fabric was obtained in the same manner as in Example 2-3, except that polyurethane elastic yarn (Toyobo Espa type 765) 44 dtex was used in place of the polyolefin elastic yarn. Elongation of composite elastic yarn The rates are shown in Table 2.

[0089] The thread tube after the set of the elastic yarn was crushed at the center, and was wound around the new yarn tube at a low speed at which it was difficult to release the yarn. When the knitting is released, the elasticity of the yarn is large and the tension of the yarn becomes low, causing tangled tangles and the handling is extremely bad. For this reason, a special anti-pili device was used, but the release tension was high. It was a knitting machine with a special active yarn feeding device. The resulting knitted fabric had knitting steps and was only strong in a knitted fabric that was unsuitable for thick underwear.

Example 2— 2

A woven fabric was obtained in the same manner as in Example 2-1, except that the yarn was not set after the composite yarn was obtained by spinning. Table 2 shows the elongation of this yarn.

Although the performance of the fabric was good, when the shuttle loom was used when weaving the fabric, the fluctuation in the weaving width became large. Weaving with a weaving machine that supplies weft yarns at a constant tension, such as revere looms and jet looms, produced a woven fabric with a uniform weaving width. In addition, although weaving occurred partially during weaving, there were defects in the fabric.

[0090] [Table 2]

[0091] When the elongation percentage of the composite yarn was greater than 10%, weaving was difficult. In addition, when the elongation percentage after heat treatment is less than 30%, the function of the stretchable fabric is not exhibited.

Industrial applicability

[0092] Although the elastic yarn and elastic composite yarn of the present invention are yarns that can obtain a stretchable fabric, they have poor stretchability at the time of weaving and weaving, so that troubles during weaving are avoided and a high quality fabric is obtained. Can be manufactured.

Claims

The scope of the claims

[I] An elastic yarn having a breaking elongation of 80 to 300%, a breaking elongation of 500% or more, and an elongation recovery rate of 50% or more by heat treatment.

[2] The elastic yarn according to [1], wherein the material strength includes cross-linked polyolefin.

[3] A fabric comprising the elastic yarn according to claim 1.

[4] A method for producing a stretchable fabric, wherein a stretchable fabric is obtained by heat-treating the fabric according to claim 3.

5. The method according to claim 4, wherein the heat treatment is heat treatment at 60 to 200 ° C. for 1 to 60 minutes.

[6] A method for producing an elastic yarn, comprising a step of heat-setting a crosslinked polyolefin elastic yarn at 60 ° C. or higher while stretching or after stretching.

7. The method according to claim 6, wherein the elongation is performed at an elongation rate of 100 to 450%.

[8] The method according to claim 6, wherein the heat setting is performed for 0.03 seconds to 1 minute.

[9] An elastic composite yarn having an elongation rate of 10% or less and an elongation rate of 30% or more by heat treatment.

10. The elastic composite yarn according to claim 9, comprising an elastic fiber and a non-elastic fiber made of a material containing a cross-linked polyolefin.

[I I] A fabric comprising the elastic composite yarn according to claim 9.

[12] A method for producing a stretchable fabric, wherein the fabric according to claim 11 is heat-treated to obtain a stretchable fabric.

13. The method according to claim 12, wherein the heat treatment is a heat treatment at 60 to 200 ° C. for 0.5 to 60 minutes.

[14] A method for producing an elastic composite yarn comprising a step of heat-setting a composite yarn comprising a cross-linked polyolefin elastic fiber and an inelastic fiber at 60 ° C. or higher while the elastic fiber is stretched or stretched.

15. The method according to claim 14, wherein the elongation is performed at an elongation rate of 100 to 450%.

[16] The method according to claim 14, wherein the heat setting is performed for 0.03 seconds to 60 minutes.