JP2007046186A - Latent type highly stretchable handicraft yarn - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a handicraft yarn capable of imparting stretchability to a fabric and excellent in handleability. <P>SOLUTION: The latent type highly stretchable handicraft yarn is a conjugate handicraft yarn obtained by twisting a plurality of crosslink type polyolefin-based elastic yarns and inelastic yarns together or carrying out conjugate spinning of the crosslink type polyolefin-based elastic yarn and inelastic fiber and then twisting a plurality of the spun yarns. In the handicraft yarn, the dry elongation is ≤40% and elongation after boiling with water is 50-200% and recovery factor in 30% stretching is ≥50%. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a highly stretchable handicraft yarn excellent in handleability. More specifically, the present invention relates to a handicraft yarn that has low elongation at the time of knitting, excellent handleability, and develops stretchability by heat treatment after knitting.

  Hand-knitted yarn, represented by woolen yarn, has been used in certain fields as clothing yarn against the background of diversification and individualization. In addition to conventional wool sweaters for autumn and winter, the use of handicraft yarns such as cotton and silk has been developed for spring and summer. However, in particular, handicraft yarn products using cotton yarn or silk yarn have the disadvantages that the handicraft yarn itself does not swell and has poor stretchability, so it is heavy, easily deformed, and lacks fit. In addition, because of the consumption performance that places an emphasis on comfort, there is a demand for further improvement in stretchability of yarn products.

For the purpose of improving the above problems, a method of compounding polyurethane-based or polyether ester-based elastic fibers (for example, see Patent Document 1) or a method of compounding crimped yarns of polytrimethylene fibers (for example, see Patent Document 2) ) And a method using the same bicomponent fiber (hereinafter referred to as bicon fiber) (for example, see Patent Document 3).
JP 2002-327347 A JP 2003-20530 A JP 2004-360145 A

  However, the crimped yarn of polytrimethylene fiber is suppressed in the expression of crimp due to the binding force of the inelastic fiber in the yarn dyeing process, and the expression of stretchability is insufficient. Moreover, since the shrinkage stress is large when using the same type bicon fiber, there is a problem that a dyeing difference easily occurs between the inner and outer layers at the time of dyeing, so that a temporary setting is necessary. In addition, polyurethane and polyetheresters have high tensile stress, so they tend to be thick and heavy products, deterioration during long-term storage, and avoiding dyeing differences due to winding hardness. There are issues such as restrictions.

  In addition, the composite elastic yarn is an actual stretch yarn, which becomes a fatal defect as a handicraft yarn. That is, in the actual stretchable yarn, the difference in yarn feeding tension at the time of knitting is directly linked to the difference in loop length, leading to defects in knitting steps and tone. In the case of machine knitting, it is possible to control a range that is an auxiliary tool or the like. In addition, general handicraft yarns are commercially available in a curly shape without a winding core, and can be unwound from the innermost layer yarn and used to be unraveled while the wound ball is kept stationary. It is very convenient when used on a knitting machine. However, it is very difficult to make the actual stretchable yarn a coreless ball, and it is difficult to maintain a stable shape.

  The present invention has been made against the background of the problems of the prior art. It is an object of the present invention to provide a handicraft yarn that can impart stretchability to a fabric and is excellent in handleability.

As a result of intensive studies to achieve the above-mentioned object, the inventors of the present invention treat the cross-linked polyolefin-based elastic yarn and non-elastic fiber as a handicraft so that they are handled in the same manner as the non-elastic yarn during knitting. It was discovered that handicraft yarns that exhibit stretchability can be obtained for the first time by heat treatment during finishing. That is, the handicraft yarn of the present invention is
1. A composite handicraft yarn in which a plurality of cross-linked polyolefin-based elastic yarns and inelastic yarns are twisted or a plurality of cross-linked polyolefin-based elastic yarns and non-elastic fibers are spun together and then a plurality of cross-twisted yarns, A latent high-stretch handicraft yarn characterized by a dry elongation of 40% or less, an elongation of 50 to 200% by boiling water treatment, and a recovery rate of 30% when stretched is 50% or more. . A latent high-stretch handicraft yarn that is a composite spun yarn consisting of inelastic short fibers.
3. Latent high stretch handicraft yarns whose inelastic short fibers are natural fibers such as cotton or wool fibers;
4). Cross-linked polyolefin elastic yarns and inelastic yarns are twisted or cross-linked polyolefin elastic yarns and inelastic fibers are spun together, then multiple twists are twisted and combined in any process from spinning to winding balls. This is a method for producing handicraft yarn, characterized by subjecting the yarn to wet heat treatment at 60 ° C. or higher and 95 ° C. or lower in a tensioned state.

  The handicraft yarn of the present invention is a handicraft yarn that expresses stretchability after knitting, i.e., has a potential for stretchability. Handicraft yarn with little variation in loop length that is easy to knit. It is a handicraft yarn that develops stretchability only after heat treatment after knitting, is soft and swells, and provides an appropriate stretch knitted fabric. In addition, it is a handicraft yarn that is excellent in heat resistance, chemical resistance, and light resistance, and is capable of obtaining a knitted fabric excellent in post-workability and durability.

Hereinafter, the present invention will be described in detail.
The handicraft yarn of the present invention is a composite handicraft yarn in which a plurality of cross-linked polyolefin elastic yarns and non-elastic yarns are knitted, or a plurality of cross-linked polyolefin elastic yarns and non-elastic fibers are spun together and then stranded. It is preferable. When the cross-linked polyolefin elastic yarn is heat-treated (heat set) in the stretched state, it loses its elasticity to such an extent that it can be handled as a normal inelastic yarn. The inventors of the present application paid attention to the unique property of expression. In other words, when this is applied to handicraft yarns, it is a handicraft yarn that has excellent roll shape retention and is easy to knit with little fluctuation in loop length even when fluctuations in knitting tension occur. This is based on the finding that a fabric rich in swelling can be obtained.

The cross-linked polyolefin fiber referred to in the present invention is a fiber that is uniformly branched and is obtained by subjecting a substantially linear olefin to a cross-linking treatment.
Here, the olefin fiber which is uniformly branched and is substantially linear refers to a polymer obtained by polymerizing an olefin monomer, and the degree of branching of the polymer is uniform.
For example, low-density polyethylene copolymerized with α-olefin and elastic fiber described in JP-A-8-509530 are examples.
Examples of the crosslinking method include chemical crosslinking using a radical initiator, a coupling agent, and the like, and a method of crosslinking by irradiating energy rays. In consideration of stability after becoming a product, crosslinking by irradiation with energy rays is preferable, but the present invention is not limited to these methods.

  The cross-linked polyolefin elastic fiber used in the handicraft yarn of the present invention is preferably used, and the fineness of the elastic fiber in the composite yarn is preferably 20 dTex or more and 330 dTex or less. If it is less than 20 dTex, the stretchable ability is insufficient, and if it exceeds 330 dTex, the stretchability is strong and the texture becomes hard. In addition, the cross-linked polyolefin fiber is expensive, and if the expansion / contraction performance can be satisfied, it is economically preferable that the mixing ratio is low. The elastic yarn may be a monofilament or a multifilament. The non-elastic yarn is obtained by twisting 2 to 20 yarns from 60 English cotton count (102 番 count) to 3 English cotton count (5 梳 count). The non-elastic yarn is spun by itself and several twisted non-elastic spun yarns and cross-linked polyolefin fiber are twisted, or the cross-linked polyolefin fiber is used as the core yarn and the non-elastic fiber is used as the sheath, so These can be twisted later, or a plurality of inelastic spun yarns and cross-linked polyolefin fibers can be twisted after twisting. From the viewpoint of increasing the friction durability of the cross-linked polyolefin fiber, it is preferable to twist after forming a composite spun yarn, and from the viewpoint of obtaining a highly stretchable knitted fabric, the other two methods are preferable. These composite methods can be selected based on the required characteristics of the product.

  In order to maintain the torque balance, it is preferable that the lower twist and the upper twist are in opposite directions. One of the reasons for using a cross-linked polyolefin fiber is that it has excellent heat setting properties, heat resistance, and chemical resistance. When the crosslinked polyolefin fiber is stretched and set at a temperature of 60 ° C. or higher (the crystalline melting point of the polyolefin fiber), it has a setting rate of 95% or higher and an elastic recovery rate of 50% or higher in the relaxation heat treatment in the next step. Heat resistance and chemical resistance are useful requirements for additional processing on finished products. In addition, chemical stability, heat resistance, and chemical resistance greatly contribute to the fact that quality is not changed even after long-term storage required for handicraft yarn.

  Another important function of the cross-linked polyolefin fiber is the resilience in relaxation heat treatment. When the cross-linked polyolefin fiber is heat-set at a temperature equal to or higher than the crystalline melting point, a rigid composite yarn is obtained, and the elastic yarn contracts by the subsequent relaxation heat treatment, and the elasticity as the composite yarn is restored. The elongation of the elastic composite yarn at this time is preferably 50 to 200%, and the recovery rate at the time of 30% elongation is preferably 50% or more. If the elongation is less than 50%, the stretchability is insufficient and is not intended, and if it is 200% or more, the dimensional stability of the product is lowered, which is not preferable. More preferably, it is 50% or more and less than 100%. On the other hand, if the recovery property at 30% elongation is less than 50%, the elongation recovery property of the product is lowered, leading to deformation, which is not preferable. More preferably, it is 70% or more and less than 100%.

  A non-elastic yarn can be a filament yarn, but a tactile metal-like luster is disliked. Therefore, in the case of a filament, a bulky processed yarn such as false twisted yarn is preferable. More preferably, the short fiber spun yarn is preferable in terms of imparting a warm touch feeling and a moderate aeration effect. In particular, when used for clothing, moisture absorption and moisture permeability are required, and therefore natural fibers such as cotton or wool fibers are more preferable. When durability and easy care properties are required, it can be used by blending with short fibers such as synthetic fibers such as polyester. In some cases, the present invention can also be applied as a composite yarn with a synthetic filament yarn.

The handicraft yarn of the present invention is cross-twisted between a cross-linked polyolefin elastic yarn and a non-elastic yarn, or a plurality of cross-twisted yarns after composite spinning of a cross-linked polyolefin elastic yarn and a non-elastic fiber. In any step, the composite yarn can be obtained by subjecting the composite yarn to wet heat treatment at 60 ° C. or more and 95 ° C. or less in a tension state. As described above, the composite form of the elastic yarn and the non-elastic fiber can be combined by any method such as cross-twisting, composite spinning, and mixed fiber. In the case of cross-twisting, the lower twist is preferably 2.0 to 4.5 in the case of cotton yarn and 1.5 to 3.0 in the case of wool. The twist coefficient K is obtained from the following equation. K = number of twists per ridge / √ count Especially when making a handicraft yarn for a summer sweater, set higher in these categories. What is necessary is just to set the twist coefficient at the time of a top twist to 1 to 4. In addition, for the purpose of twisting, for the purpose of reducing the number of supplied bobbins and selecting the twisted yarn form, it is possible to take a method of twisting once into two or three yarns, and then twisting the twisted yarns together. it can.

The purpose of the handicraft yarn of the present invention can be achieved by performing heat setting at least once in the process from the composite of the cross-linked polyolefin elastic yarn to the ball winding. At this time, the composite yarn must be in a tension state in which a tension equivalent to the winding tension at the time of fine spinning or twisting is applied. The set temperature may be equal to or higher than the crystal melting point of the cross-linked polyolefin elastic yarn, and is 60 ° C.
It may be at least 95 ° C. If it is less than 60 ° C., the setting property is insufficient, and if it exceeds 95 ° C., the setting property and the elastic recovery property are not affected, but there is an economic disadvantage. This temperature means the wet heat temperature, but of course may be dry heat, and is set 60 ° C. higher than the wet heat. In this case, it is preferable to avoid contact with a heated object such as a heater. Of course, it is also possible to perform additional heat setting before and after compounding the cross-linked polyolefin-based elastic yarn for the purpose of improving process passability.

  The relaxation heat treatment after knitting is preferably performed in a sufficiently tension-free state with wet heat treatment. Specifically, the heat treatment is performed on a net, and steam treatment at 100 ° C. to 130 ° C. may be performed. Although it can be processed at 150 ° C. to 180 ° C. with dry heat, it is necessary to use a tumbler or the like in combination with the squeezing action.

Hereinafter, although it explains in full detail using an Example, embodiment is not limited.
[Measurement method of elongation]
Multiply the total fineness (dTex.) Of the elastic yarn used in the yarn to the obtained handicraft yarn by a load of the number of grams, and attach it to a Tensilon type elongation tester with a chuck interval of 20 cm. From the obtained stress strain curve, the elongation at break is obtained.

[Measurement method of elongation and elongation recovery rate after boiling water treatment]
Wrap the handicraft yarn in gauze in an unconstrained state and treat with boiling water for 30 minutes. The sample taken out from boiling water is allowed to stand at room temperature, and the gauze is removed at room temperature and air-dried for 3 hours. The sample is measured for elongation using a Tensilon type elongation tester in the same manner as the measurement of elongation.
Using the Tensilon-type extension tester in the same method, the extension recovery rate is stopped when the elongation is 30%, immediately relaxed at the same speed as the extension speed, and the following formula is obtained from the chuck interval (Lcm) when the stress becomes zero. Obtain the elongation recovery rate.
Elongation recovery rate (%) = {(20 × 1.3−L) /20×0.3} × 100

[Method of measuring set rate and elastic recovery rate]
A cross-linked polyolefin elastic yarn is marked at intervals of 10 cm under a load of 0.0008 cN / dTex. The yarn is stretched 3 times, set at a dry heat of 140 ° C. for 30 seconds, slowly cooled at room temperature, To release the elongation at 0.0008 cN / dTex. The distance 1 (cm) between the marks is measured under the following load, and the set rate is obtained from the following equation.
Set rate (%) = (l−10) / (3 × 10−10) × 100
The yarn is wrapped in gauze, treated with boiling water, air-dried, and the distance between the marks l ₁ (cm) is measured again under a load of 0.0008 cN / dTex.
Elastic recovery rate (%) = [(l−l ₁ ) / (l−10)] × 100

[Example-1]
A roving made of cotton fibers having an average fiber length of 29 mm is drafted 22 times between the front roller and the back roller, and at the same time, a monofilament of crosslinked polyolefin fiber 78dTex is drafted 3.1 times and supplied to the front roller, and twisted. The core was wound into a fine spinning cup under a tension of 70 g with a coefficient of 3.7 to obtain a core-sheath type composite spun yarn with 30 cotton counts. The mixture ratio of the crosslinked polyolefin fiber was 12.7%. The two spinnings are aligned, twisted in the twist direction opposite to the spun yarn at a twisting factor of 1.4, set at 80 ° C. for 15 minutes, and after continuous mercerization with caustic soda solution at a concentration of 20%, the cheese is processed. The resultant was wound up, dyed with a reactive dye (Sumitix Supra manufactured by Sumitomo Chemical Co., Ltd.) at 100 ° C. for 45 minutes, washed with water, soaped and dried. Eight obtained dyed yarns were collected and twisted at 150 T / m in the same direction as the spinning process. Then, it was finished into a coreless wound ball of 40 g in a ball winding process. The shape of the rolled ball was stable and could be unwound more smoothly than the innermost layer. The performance of this handicraft yarn is shown in Table-1. Using this handicraft yarn, after knitting by hand knitting, steam setting at 100 ° C for 1 minute in a stationary state, soft and swelled, highly elastic, suitable for spring sweaters can be obtained. It was.

[Example 2]
A rough yarn made of cotton fibers having an average fiber length of 29 mm is drafted 22 times between the front roller and the back roller, and at the same time, a monofilament of crosslinked polyolefin fiber 78 dtex is drafted 3.5 times and supplied to the front roller. The twist coefficient was 3.7 and wound into a fine spinning cup under a tension of 70 g to obtain a core-sheath type composite spun yarn with 20 cotton counts. The mixing ratio of the cross-linked polyolefin fiber was 7.5%. Two of the spinnings are aligned, twisted in the twist direction opposite to the spun yarn with a twisting factor of 2.5, and further, six of the twin yarns are aligned, and twisted at 100 T / m in the same direction as the spinning process. did. Then, it was set at 80 ° C. for 15 minutes. Then, it was taken up in a koji, and after koji mercerizing with a caustic soda solution having a concentration of 20%, it was dyed with a reactive dye (Sumitix Supra manufactured by Sumitomo Chemical Co., Ltd.) at 100 ° C. for 45 minutes, washed with water, soaped and dried. After settling, the carrier was set at 80 ° C. for 15 minutes. In the ball winding process, it was finished into a coreless wound ball of 40 g. The shape of the rolled ball was stable and could be unwound more smoothly than the innermost layer. The performance of this handicraft yarn is shown in Table-1. Using this handicraft yarn, knitted fabric by hand knitting, and then steam set at 100 ° C for 1 minute in a stationary state, it is very uniform, soft and swelled, highly elastic, and suitable for spring sweaters The ground was obtained.

[Example 3]
From the top of 100% wool dyed with a top dye having an average fiber diameter of 27 microns, a twisted yarn with a twist factor of 2.1 was obtained from a top of 100% wool, and 16 yarns were obtained. Monofilaments of the crosslinked polyolefin fiber 78 dtex drafted four times with the four worsted yarns were aligned and twisted in the S direction at 90 T / m. After setting at 90 ° C. for 15 minutes, it was finished into a coreless wound ball of 40 g by a ball winding process. The shape of the rolled ball was stable and could be unwound more smoothly than the innermost layer. The performance of this handicraft yarn is shown in Table-1. Using this handicraft yarn, hand-knitted into a knitted fabric, and then steam set at 100 ° C for 1 minute in a stationary state, it is a very uniform, soft, more bulky feeling, and a winter sweater with excellent stretch recovery. A suitable knitted fabric was obtained. Moreover, when knitting, it could be knitted without any discomfort with ordinary hand-knitted yarn.

[Comparative Example 1]
The elastic yarn used is polyurethane elastic yarn (Espa T765 manufactured by Toyobo Co., Ltd.) 78dTex. Except that, handicraft yarn was obtained in the same manner as in Example 1 and evaluated by the same method. The performance of the handicraft yarn is shown in Table-1. In the rolling ball process, the shape of the ball was not stable without a core, could not be made into a coreless ball, and was unavoidably wound on a cored bobbin. The obtained handicraft yarn was rich in elasticity and stretched too much when hand-knitted, making it difficult to handle. The knitted fabric had knitting steps due to the difference in loop length, and was only a product lacking in quality. It was also found that this product started to deteriorate after 5 years and could not have long-term inventory.

[Comparative Example 2]
The elastic yarn used is a low temperature setting polyurethane elastic yarn (Espa M manufactured by Toyobo Co., Ltd.) 78dTex. Except that, handicraft yarn was obtained in the same manner as in Example 1 and evaluated by the same method. The performance of the handicraft yarn is shown in Table-1. There was no problem with the formation of the coreless wound ball, but there was no shrinkage when steaming after forming the knitted fabric, and as a result, it was only a product without stretchability and swelling.

  The handicraft yarn of the present invention has a low elongation equivalent to that of a normal spun yarn, exhibits a coreless bobbin forming property and handleability, and after forming a knitted fabric product, it exhibits stretchability only after heat treatment. This is a handicraft yarn with latent elasticity that is superior in stability and chemical stability, and it can give appropriate elasticity without impairing the quality of the fabric without using special equipment and skills, contributing to the industry. It is great to do.

Claims (4)

  A composite handicraft yarn in which a plurality of cross-linked polyolefin-based elastic yarns and non-elastic yarns are twisted or a plurality of cross-linked polyolefin-based elastic yarns and non-elastic fibers are spun together and then twisted in a dry manner. A latent high-stretch handicraft yarn having a degree of 40% or less, an elongation of 50 to 200% by boiling water treatment, and a recovery rate of 30% or more when stretched by 30%.   The latent high-stretch handicraft yarn according to claim 1, wherein the non-elastic yarn is a composite spun yarn comprising inelastic short fibers.   The latent high-stretch handicraft yarn according to claim 1 or 2, wherein the inelastic short fibers are natural fibers such as cotton or wool fibers. Cross-twisting cross-linked polyolefin elastic yarns and non-elastic yarns, or composite spinning of cross-linked polyolefin elastic yarns and non-elastic fibers and then twisting multiple strands, and combining in any process from spinning to winding balls A method for producing handicraft yarn, characterized in that the yarn is subjected to wet heat treatment at 60 ° C. or more and 95 ° C. or less in a tension state.