JP2006307369A - Stretchable filling knitted fabric and method for producing the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a stretchable filling knitted fabric having excellent extensibility and stretch recovery properties and to provide especially an interknitted stretchable filling knitted fabric suitable when a thin knitted fabric is obtained in an interknitted filling knitted fabric in which a latent crimp developing polyester eccentric conjugated fiber is interknitted with another non-elastic fiber and the polyester eccentric conjugated fiber is arranged in a part of courses. <P>SOLUTION: The interknitted stretchable filling knitted fabric is obtained by knitting the polyester eccentric conjugated fiber in which at least one component is polytrimethylene terephthalate with the other non-elastic fiber. In the knitted fabric, the polyester eccentric conjugated fiber is arranged in the part of courses. The stitch length (L<SB>1</SB>cm) of stitches of the polyester eccentric conjugated fiber is within a specific range and the stitch length (L<SB>2</SB>cm) of the stitches of the non-elastic fiber is within a specified range. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention is a stretchable weft knitted fabric using a polyester-based eccentric composite fiber with latent crimping property, wherein at least one component is polytrimethylene terephthalate, and has particularly excellent durability to chlorine and good stretchability. Further, the present invention relates to a lightweight and thin stretchable weft knitted fabric which has a good stretch recovery property that the stretched fabric almost returns to its original state.

  Conventionally, elastic weft knitted fabrics with excellent stretchability and stretch recovery have been manufactured using polyurethane-based elastic fibers such as LYCRA (registered trademark), mainly for clothing such as innerwear, sportswear, and outerwear. It has been used for applications. However, although elastic weft knitted fabrics using polyurethane-based elastic fibers are excellent in stretchability, polyurethane itself is generally inferior in durability, so elastic fiber breakage is likely to occur in the subsequent process, and the problem of characteristic deterioration due to embrittlement Is likely to occur. Polyurethane is inherently low in chlorine resistance and easily deteriorates in an environment where chlorine is used for sterilization, such as pool water. For swimwear and stretch jeans that are discolored (used) by chlorine. Therefore, it was necessary to use polyurethane fiber which was made chlorine-resistant and to devise a processing method.

  On the other hand, in order to solve such problems of polyurethane elastic fiber mixed fabrics, instead of polyurethane elastic fibers as stretch yarns, wooly polyester yarns, wooly nylon yarns, or polybutylene terephthalate yarns subjected to wooly processing In some cases, woolly crimped yarn was used. However, when the wooly processed yarn is used as the stretch yarn, there is a problem that the stretchability and the stretch recovery property are inferior, and the final product such as a swimsuit cannot give a sufficient stretch.

  In order to solve such a problem, a stretchable weft knitted fabric using a polytrimethylene terephthalate fiber yarn excellent in stretchability and stretch recovery property as a stretchable yarn has been proposed.

  For example, as a method for obtaining an elastic weft knitted fabric, a multifilament made of fibers obtained by combining two types of polytrimethylene terephthalate having a difference in intrinsic viscosity of 0.05 to 0.4 (dl / g) in a side-by-side manner. It has been proposed to knit a weft knitted fabric using yarn (see Patent Document 1).

  However, since polytrimethylene terephthalate is generally easily pyrolyzed, the stretchable weft knitted fabric by this method has a drawback that the strength of the fabric after knitting or dyeing tends to be weak.

  Polytrimethylene terephthalate highly oriented unstretched fiber by high-speed spinning is drawn and false twisted into a crimped yarn with a stretch elongation of 130% or more. Using this crimped yarn, a double stretch knitted fabric with high stretchability Has been proposed (see Patent Document 2). However, this method requires a crimping process before knitting, and therefore has a demerit that an extra cost is required for the crimping process and the manufacturing cost is high.

In addition, in a knitted circular knitted fabric knitted with polytrimethylene terephthalate composite fiber and spun yarn, and the polytrimethylene terephthalate composite fiber is arranged on all courses, the loop length (ymm of the polytrimethylene terephthalate composite fiber) ) Within the range specified by the mathematical formula (the following formula) in relation to the total fineness (xdtex) of the knitting yarn, an elastic circular knitted fabric excellent in stretchability and form retention can be obtained. Is disclosed (see Patent Document 3).
0.0095x + 1.4 ≦ y ≦ 0.0095x + 3.0

  However, with this method, it is necessary to place polytrimethylene terephthalate composite fibers on the entire course of the knitted fabric, so two types of yarn are simultaneously supplied to a single knitting needle, such as plating on a tengu or milling structure. Therefore, it is necessary to knit or to make a reversible structure, and there is a problem that a thick fabric tends to be formed. Further, in an actual weft knitted fabric structure, stitches are formed by one knitting yarn, and knitted fabrics having various knitting patterns are often designed by combining three types of knitting methods, knit, tuck, and welt. However, the above-mentioned method of arranging the polytrimethylene terephthalate composite fiber in all courses is a knitted knitted fabric in which the polytrimethylene terephthalate composite fiber is arranged in a part of the knitted fabric constituting the stitch with one knitting yarn. It can not be.

JP 2003-27356 A JP 2000-239949 A Patent 2004-76191

  Therefore, the present invention provides an extensibility in a knitted weft knitted fabric in which a polyester-based eccentric conjugate fiber having latent crimping properties and other non-elastic fibers are knitted, and the polyester-based eccentric conjugate fiber is partially arranged on the course. It is an object of the present invention to provide a stretchable weft knitted fabric excellent in both stretch recovery properties, and in particular, to provide a knitted stretchable weft knitted fabric suitable for a thin fabric.

  The stretchable weft knitted fabric of the present invention is specified by the following matters in order to achieve the above object.

That is, in a knitted weft knitted fabric knitted with a polyester-based eccentric composite fiber whose at least one component is polytrimethylene terephthalate and another inelastic fiber, the polyester-based eccentric composite fiber is partially disposed on the course, and the polyester-based Stretchability in which the stitch length (L ₁ cm) of the eccentric composite fiber satisfies the following formula (1) and the stitch length (L ₂ cm) of the inelastic fiber satisfies the following formula (2) It is a weft knitted fabric.

(In the above formula, L ₁ : stitch length [cm] of the stitch of the polyester-based eccentric composite fiber,
d ₁ : Diameter [cm] of the knitting yarn of the polyester-based eccentric composite fiber,
L ₂ : stitch length of inelastic fiber stitch [cm],
d ₂ : Diameter of inelastic fiber knitting yarn [cm],
n: Number of Tengu
m: number of wrappings. )

The stretchable weft knitted fabric of the present invention is excellent in durability against chlorine even in the case of a thin fabric and a light knitted fabric, and can have both good extensibility and good elongation recovery at the same time. Therefore, when using the stretch weft knitted fabric of the present invention, especially when making clothing, even if it is thin clothing,
It has excellent stretch properties and is easy to put on and take off. it can.

  Further, when the elastic weft knitted fabric is manufactured according to the method of the present invention, it is not necessary to perform a crimping process such as false twisting before knitting, and crimping can be expressed by dyeing treatment after knitting. Is advantageous.

  Hereinafter, the stretchable weft knitted fabric of the present invention and the production method thereof will be described in more detail.

  The stretchable weft knitted fabric of the present invention is a cross knitted weft knitted fabric knitted with a polyester-based eccentric composite fiber and other inelastic fibers. A polyester-based eccentric composite fiber composed of methylene terephthalate.

  In this polyester-based eccentric composite fiber, polymers having different shrinkage characteristics have an eccentric composite structure such as a side-by-side type or an eccentric core-sheath type. This is what causes crimps.

  The mechanism by which this polyester-based eccentric composite fiber develops crimp is as follows.

  In other words, in a composite fiber in which a polymer having a different shrinkage property due to a difference in intrinsic viscosity or a polymer type is combined with an eccentric composite structure, a treatment with heating in a relaxed state can be performed to reduce the low shrinkage polymer side. Compared to the above, the high-shrinkage polymer side contracts greatly, distortion occurs in the single fiber, and a form of three-dimensional coil crimping in which the high-shrinkage polymer side is the inside of the coil appears. The fiber receives heat during spinning and drawing in the process of producing the composite fiber, but since heating during the spinning process is performed on the tensioned fiber, the shrinkage difference between the two components is slight, and the yarn is produced. The composite fiber at the stage of being wound up has only a slight crimp, and is in a state of a latent crimpable composite fiber.

  The coil diameter and the number of coils per single fiber length in the three-dimensional coil crimp of the crimped composite fiber are greatly influenced by the difference in contraction and the elastic recovery rate between the high contraction component and the low contraction component. The greater the difference, the smaller the coil diameter and the greater the number of coils per unit fiber length. As the coil diameter is smaller and the number of coils per unit fiber length is larger, the crimped yarn has better elongation characteristics and better appearance.

  Further, the better the sag resistance of the coil, the smaller the amount of coil sag according to the number of expansions and contractions, and the crimped yarn excellent in stretch retention.

  In addition, the expansion and contraction characteristics of coil crimps are dominated by the expansion and contraction characteristics of the high contraction component with the low contraction component as a fulcrum, so it is effective to use a polymer with high stretchability and recoverability for the high contraction component. It is. From this viewpoint, polytrimethylene terephthalate is used as a highly shrinkable component of the composite fiber.

  A fiber made of polytrimethylene terephthalate has excellent mechanical properties and chemical properties equivalent to fibers made of polyethylene terephthalate or polybutylene terephthalate, and is extremely excellent in stretch recovery. This is because the methylene chain of the alkylene glycol part in the polytrimethylene terephthalate crystal structure has a Gauche-Gauche structure (the molecular chain bends at 90 degrees), and is further constrained by the interaction between benzene rings (stacking, parallel). It is thought that the molecular chain is easily stretched and recovered by the rotation of the methylene group because the point density is low and the flexibility is high.

  The polytrimethylene terephthalate as at least one component of the polyester-based composite fiber used in the present invention is a polyester having a trimethylene terephthalate unit as a main repeating unit, specifically, terephthalic acid as a main acid component, It is a polyester having trimethylene terephthalate units, which are obtained by using 3-propanediol as a main glycol component, as main repeating units. What copolymerized ester units (copolymerization component) other than a trimethylene terephthalate unit may be used. The proportion of the copolymer component is preferably 20 mol% or less, and more preferably 10 mol% or less.

  Examples of copolymerizable compounds include dicarboxylic acids such as isophthalic acid, succinic acid, cyclohexanedicarboxylic acid, adipic acid, dimer acid, sebacic acid, and 5-sodium sulfoisophthalic acid, ethylene glycol, diethylene glycol, butanediol, and neopentyl. Examples include diols such as glycol, cyclohexanedimethanol, polyethylene glycol, and polypropylene glycol.

  If necessary, titanium dioxide as a matting agent, fine particles of silica or alumina as a lubricant, hindered phenol derivatives, coloring pigments as an antioxidant may be added.

  The low shrinkage component of the polyester-based composite fiber of the present invention may be the above-described polytrimethylene terephthalate (however, the intrinsic viscosity is different from that of the high shrinkage component), or other polyesters such as polyethylene terephthalate may be used. Good. In particular, when polyethylene terephthalate is used, the strength of the polyester-based composite fiber itself is increased because some of the constituent components of the fiber are polyethylene terephthalate having excellent strength, and durability in the final product can be increased. Furthermore, it is preferable because the setability at the dyeing process is improved and the fiber becomes easy to handle. In addition, the eccentric composite fiber consisting of polymethylene terephthalate and polyethylene terephthalate is particularly excellent in stretchability compared to other polyester-based composite fibers, so as an elastic yarn for knitted knitted fabric used only for some courses Particularly preferred.

  Polyethylene terephthalate used as a low shrinkage component of the polyester composite fiber is a polyester having ethylene terephthalate units as the main repeating unit. More specifically, it is a polyester having terephthalic acid as the main acid component and ethylene terephthalate units obtained as the main glycol component and ethylene glycol as the main glycol component. A copolymer obtained by copolymerizing an ester bond (copolymerization component) other than the ethylene terephthalate unit may be used. The proportion of the copolymer component is preferably 20 mol% or less, and more preferably 10 mol% or less.

  Examples of the copolymerizable compound include sulfonic acid, sodium sulfonic acid, sulfuric acid, sulfate ester, diethyl sulfate, ethyl sulfate, aliphatic sulfonic acid, ethane sulfonic acid, chlorobenzene sulfonic acid, alicyclic sulfonic acid, isophthalic acid, sebacine Dicarboxylic acids such as acid, azelaic acid, dimer acid, adipic acid, oxalic acid, decanedicarboxylic acid, hydroxycarboxylic acids such as p-hydroxybenzoic acid and ε-caprolactone, triethylene glycol, polyethylene glycol, propane Examples include diols such as diol, butanediol, pentanediol, hydroquinone, and bisphenol A.

  If necessary, titanium dioxide as a matting agent, fine particles of silica or alumina as a lubricant, hindered phenol derivatives, coloring pigments as an antioxidant may be added.

  In view of obtaining coiled crimps and obtaining desired stretchability in the weft knitted fabric of the present invention, the intrinsic viscosity of polytrimethylene terephthalate is preferably 1.0 or more, and preferably 1.2 or more. More preferred.

  The composite of the high shrinkage component and the low shrinkage component in the single yarn cross section of the polyester composite fiber used in the present invention is an eccentric composite structure represented by a side-by-side type or an eccentric sheath / core type. In the case of not taking an eccentric composite structure in the single yarn cross section, even if heat is applied to the yarn, coiled crimps do not appear, and the yarn cannot be given stretchability.

  In addition, the weight ratio of the high shrinkage component and the low shrinkage component in the polyester-based composite fiber is in the range of 30/70 or more and 70/30 or less from the viewpoint of yarn production and dimensional uniformity of the coil in the fiber length direction. Is preferred.

The yarn fineness of the polyester-based composite fiber is determined according to the use and purpose of the knitted fabric, but in general, a range of 20 dtex to 1000 dtex is preferable. In addition, the single yarn fineness of the polyester composite fiber is determined according to the use of the knitted fabric, but in general, a range of 0.4 dtex to 25 dtex is preferable.

  In the present invention, as the fiber imparting stretchability to the weft knitted fabric, a polyester-based eccentric composite fiber having excellent latent crimpability is used, so there is no need for crimping such as false twisting, and knitting Since the crimp is automatically developed when heat is applied at the time of subsequent dyeing processing, a fabric exhibiting excellent stretchability can be easily manufactured at low cost.

  In the stretchable weft knitted fabric of the present invention, when the above-mentioned polyester-based composite fiber is used for a knitting yarn of a stretchable material, it is a knitted fabric having the best stretch recovery characteristics by using the composite fiber as it is. be able to. However, if there is no practical problem, the composite fiber may be combined with other materials to be used as a stretch processed yarn. Other fibers to be combined are not particularly limited, and may be either filament yarn or spun yarn. The form of the stretchable yarn is not particularly limited, and may be a covering yarn such as a single covered yarn (SCY) or a double covered yarn (DCY), or a mixed yarn, entangled yarn, twisted yarn, or core span yarn (CSY). But you can. Further, the composite fiber or its processed yarn may be used as a pre-dyed yarn.

  Further, the partner yarn used in combination with the above-mentioned polyester-based composite fiber when knitting a weft knitted fabric is a knitting yarn made of other inelastic fibers, for example, a synthetic yarn such as ordinary nylon yarn or polyester yarn. It may be a fiber filament yarn or a spun yarn made of natural fibers such as cotton yarn, wool yarn, hemp yarn. Further, it may be a processed yarn obtained by subjecting these inelastic fibers to crimping or the like, or may be a twisted yarn or a mixed yarn.

  The knitting machine used for knitting the weft knitted fabric of the present invention may be a general circular knitting machine, a forming knitting machine for knitting a seamless knitted fabric such as Santony, a flat knitting machine used for knitting a sweater, or a forming knitting machine. A machine may be used.

  The knitting structure in the elastic knitted fabric is not particularly limited as long as it is a knitting structure generally used for clothing such as innerwear, sportswear, and outerwear. For example, as the knitting structure of the circular knitted fabric, for example, commonly used knitting structures such as a tengu, smooth, milling, scallop, honeycomb, mock milan, ponchiroma, picket, pile, and single bag can be used. The knitting machine to be used is not particularly limited, and a single knitting machine, a double knitting machine, a horizontal knitting machine, or the like can be used freely.

However, in the stretchable weft knitted fabric of the present invention, the polyester composite fiber is arranged only in a part of the course and not in the whole course. Both the knitting yarn of the fibers are not knitted at the same time. Therefore, knitting methods such as plating sheeting and drawing are not applied to the present invention.
Generally, a polyester composite fiber is contained in all courses as in a tengu structure, which is superior in stretchability. However, if the requirements of the stretchable weft knitted fabric of the present invention are taken, for example, every other course. Sufficient stretch can be expressed in a knitted knitted fabric in which polyester composite fibers are arranged only in some courses.

  In the present invention, the stitch length of the inelastic yarn at the time of knitting, the stitch length of the polyester-based composite fiber, and the balance between them are important. The stitch length can be adjusted by changing the relationship between the amount of yarn fed per unit time and the knitting speed of the knitting machine by changing the setting of the yarn feeding device of the knitting machine. It can be confirmed by measuring its length.

  The stitch length of an ideal single unit structure suitable for a stretch knitted fabric can be obtained by the theory of Shinn or Peta or the theory of Grosberg. These are described in detail in “Fundamental Fiber Engineering” published by the Japan Textile Machinery Society. In the following description, the stitch length obtained by this calculation is referred to as a theoretical stitch length.

  Here, one unit structure is the minimum repeating unit of the yarn in a specific yarn path. As an example, FIG. 1 and FIG. 2 show one unit structure in each structure of Tenjiku knitting and 1 × 1 milling knitting. The theoretical length of yarn necessary for knitting each unit is the theoretical stitch length. is there. That is, in the tentacle knitting in which the same stitch is repeated, one stitch (loop) has one unit structure, and therefore the length of the knitting yarn per stitch is the theoretical stitch length. Further, in the 1 × 1 milling knitting in which one front stitch and one back stitch are alternately repeated, the length of the knitting yarn per two stitches is small because one front stitch and one back stitch are one unit structure. Theoretical head.

  The theoretical stitch length differs depending on the knitting structure, that is, the combination of knit, tuck, and welt, or the structure of a single knitting machine with the stitch only on the front or the structure using the double knitting machine with the stitches on the front and back. If the knitting structure is circular knitting and has no tack or welt, the theoretical stitch length (L) can be calculated by the following equation (3) for both the single knitting machine and the double knitting machine.

L = (16.64n−2.08 m) · d (3)
Here, L is the theoretical stitch length [cm] of the single unit structure, d is the diameter of the knitting yarn [cm], n is the number of the tense stitches, and m is the number of wrappings. Here, wrapping refers to a portion that connects between a single needle and a double needle at the time of rib engagement in a double knitting machine.

For example, in the case of a tengu structure, since n = 1 and m = 0 in the above equation, the theoretical stitch length (L) can be obtained by the following equation (4), and the 1 × 1 milling structure In this case, since n = 2 and m = 2, the theoretical stitch length (L) can be obtained by the following equation (5).
L = 16.64 × d (4)
L = 29.12 × d (5)

  Here, L is the theoretical stitch length [cm] of the stitch, and d is the diameter [cm] of the yarn used for knitting. Usually, it is considered that a knitted fabric with excellent quality can be knitted by knitting with this theoretical stitch length. However, in the case of a weft knitted fabric in which a polyester-based eccentric composite fiber and other inelastic fibers are knitted (polyester-based eccentric composite fiber is partly arranged on the course), it is knitted according to the theoretical stitch length. However, the features such as excellent stretchability of the polyester-based eccentric composite fiber cannot be sufficiently exhibited. In the case of this knitted weft knitted fabric, the best stretchability is exhibited when the stitch length of the polyester-based eccentric composite fiber and the stitch length of the other inelastic fiber are adjusted within a specific range. This optimum range is expressed by the formulas (1) and (2).

(In the above formula, L ₁ : stitch length [cm] of the stitch of the polyester-based eccentric composite fiber,
d ₁ : Diameter [cm] of the knitting yarn of the polyester-based eccentric composite fiber,
L ₂ : stitch length of inelastic fiber stitch [cm],
d ₂ : Diameter of inelastic fiber knitting yarn [cm],
n: Number of Tengu
m: number of wrappings. )

Equation (1) _is, L _{1 /[(16.64n-2.08m)d} 1] value (hereinafter, first of stitch coefficient _{C 1)} is in the range of 0.7 to 1.4, and represents be able to. Further, the expression (2) represents that the value of L ₂ /[(16.64n−2.08m)d ₂ ] (hereinafter referred to as the second stitch coefficient C ₂ ) is in a range of 1.125 or more. Can do.

The first stitch coefficient _{C 1} is preferably a second stitch smaller than the coefficient _{C 2.}
Knit knitting in which the polyester-based eccentric composite fibers of the stretch-imparting material are arranged only in part of the course by knitting under the condition that the stitch length satisfies the above formulas (1) and (2) Even on the ground, a stretchable weft knitted fabric having sufficient elongation and excellent kickback properties can be obtained.

  The elastic weft knitted fabric that satisfies the above conditions supplies either one of the knitting yarn of the polyester-based eccentric composite fiber or the knitting yarn of the other inelastic fiber to one knitting needle when knitting. To organize. The polyester-based eccentric conjugate fiber used for knitting is preferably a conjugate fiber (latently crimpable conjugate fiber) that has not been substantially crimped. After knitting using a latently crimpable composite fiber that has not been crimp-expressed, it is preferable that a crimp is expressed by dyeing to obtain a stretchable weft knitted fabric.

  EXAMPLES Hereinafter, although this invention is demonstrated more concretely based on an Example, this invention is not limited at all by these.

[Example 1]
As a stretchable yarn (polyester-based eccentric composite fiber yarn), a filament yarn (83dtex, 34f) of a composite fiber in which polytrimethylene terephthalate and polyethylene terephthalate are combined side-by-side (trade name “T400”, manufactured by Invista) ) Was used. On the other hand, cotton spun yarn No. 40 was used as the inelastic fiber.
A circular knitted fabric having a 1 × 1 milling structure was knitted by a double circular knitting machine of 14 gauge, 17 inches (= 43.18 cm). The 1 × 1 milling structure is a weft knitted fabric having the structure chart shown in FIG. The stretchable yarn and the cotton yarn were knitted alternately (every other course). At this time, the stitch length was adjusted by changing the setting of the yarn feeding device of the knitting machine to change the yarn feeding amount per unit time and the knitting speed of the knitting machine.

The stitch length of each yarn in this knitted fabric was determined by disassembling the knitting machine after knitting, taking out each of the composite fiber yarn and cotton yarn, and measuring the stitch length per unit structure.
The obtained raw machine was dyed under normal conditions to give a dyeing process that dyed both cotton yarn and composite fiber.
The elongation recovery rate and the constant load elongation rate of the obtained dyed fabric (dyed knitted fabric) were measured in each of the warp direction and the weft direction of the knitted fabric. The results are as shown in Table 1. Both the elongation recovery rate and the constant load elongation rate were good both in the longitudinal direction and the weft direction.

[Example 2]
As the stretchable yarn (polyester-based eccentric composite fiber yarn), the same one as used in Example 1 was used. On the other hand, 40th yarn of rayon spun yarn (trade name “Tencel”) was used as the inelastic fiber.
A circular knitted fabric with a knitting structure of one bag was knitted with a 14G double circular knitting machine. As shown in FIG. 3, the milling knitting course (first course in the figure) and the tengu knitting course (second course in the figure) are knitted alternately (every other course). The first course was knitted alternately with rayon spun yarn and the second course with composite fiber yarn.

The stitch length of each yarn in this knitted fabric was determined by disassembling the knitting machine after knitting, taking out each of the composite fiber yarn and cotton yarn, and measuring the stitch length per unit structure.
The obtained raw machine was dyed under normal conditions to obtain a dyeing process that was dyed white with both rayon spun yarn and composite fiber.
The elongation recovery rate and the constant load elongation rate of the obtained dyed fabric (dyed knitted fabric) were measured in each of the warp direction and the weft direction of the knitted fabric. The results are as shown in Table 1. Both the elongation recovery rate and the constant load elongation rate were good both in the longitudinal direction and the weft direction.

[Comparative Example 1]
The same knitting yarn as in Example 1 was used, and the knitting condition was changed so that the stitch length of the knitting yarn of the composite fiber was changed. A circular knitted fabric was formed. The obtained raw machine was dyed in the same manner as in Example 1, and then the stretch properties were measured.
The results are as shown in Table 1. The elongation recovery rate was inferior to that of Example 1, and the constant load elongation rate was insufficient.

[Comparative Example 2]
A circular knitted fabric with a 1 × 1 milling structure was used in the same manner as in Example 1 except that the same knitting yarn as in Example 1 was used and the knitting conditions were changed so that the stitch length of the cotton yarn was changed. Organized. The obtained raw machine was dyed in the same manner as in Example 1, and then the stretch properties were measured.
The results are as shown in Table 1. The elongation recovery rate was inferior to that of Example 1, and the constant load elongation rate was insufficient.

[Comparative Example 3]
As elastic yarn, instead of polyester composite fiber, polyurethane elastic fiber covering yarn (core yarn: LYCRA (registered trademark) T127C 22 dtex, wound yarn: wooly nylon 78 dtex, draft = 3.5, twist number = 400 T / m) was used. The same “Tencel” 40th count as used in Example 2 was used as the non-elastic fiber yarn.
In the same manner as in Example 2, knitting was performed with a 14G double circular knitting machine. The obtained raw machine was dyed white under normal conditions to make a dyeing process that dyed both rayon spun yarn and covering elastic yarn covering yarn (nylon fiber), and then measured the stretch properties.

The result is as shown in Table 1. Compared with Example 2, the longitudinal recovery rate in the vertical direction was insufficient.
Further, when the knitted fabric according to Comparative Example 3 and the knitted fabric according to Example 2 were bleached with chlorine, the knitted fabric of Comparative Example 3 became brittle and LYCRA (R) turned pale yellow. It was inferior to No. 2 knitted fabric.

In the above Examples and Comparative Examples, the stretch properties of the dyed stretch knitted fabric were measured by the following method.
[Elongation recovery rate]
A knitted fabric sample having a width of 2.5 cm and a length of 16 cm is prepared. For the measurement of the warp direction, the longitudinal direction of the sample is the warp direction, and for the measurement of the warp direction, the longitudinal direction of the sample is the warp direction.
After setting to a tensile tester at a gripping interval of 10 cm and extending to 80% at an extension rate of 30 cm / min according to JIS L1018, the original gripping interval was restored. At this time, the gripping interval when 80% is extended is y ₀ (cm), and the gripping interval when the stress becomes zero for the first time at the time of recovery is y ₁ (cm).
Elongation recovery rate (%) = [(y ₀ −y ₁ ) / 8] × 100

[Constant load elongation rate]
A knitted fabric sample having a width of 2.5 cm and a length of 16 cm is prepared. Set to a tensile tester at a gripping interval of 10 cm, apply a load of 22.1 N, measure the gripping interval x (cm) at that time, and obtain the constant load elongation rate from the following equation.

Constant load elongation rate (%) = [(x−10) / 10] × 100
In order to stretch comfortably when worn, the constant load elongation rate is required to be 60% or more for both vertical and horizontal. Because the maximum elongation of the skin of the parts such as the arms, armpits, waist, knees, and elbows is about 60%, if the fabric stretches more than 60%, you will feel cramped when wearing clothes. Because it is said that there is no.

  The elastic elastic knitted fabric of the present invention is excellent in stretchability in both the vertical and horizontal directions, and can be made into a thin and lightweight knitted fabric. In addition to being used for sportswear, it is also suitable for sportswear and innerwear that require sufficient stretching. Moreover, since it is excellent in durability with respect to chlorine, it is also suitable for uses that are subjected to chlorination with water wear or stretch denim-like fabric.

It is a figure which shows the structure | tissue of Tengu. It is a figure which shows the structure | tissue of a milling knitting. It is a figure which shows the structure | tissue of a single bag knitting.

Claims (5)

In a knitted weft knitted fabric knitted with a polyester-based eccentric composite fiber of which at least one component is polytrimethylene terephthalate and other inelastic fibers, the polyester-based eccentric composite fiber is partially arranged on the course, and the polyester-based eccentric composite The stitch length (L ₁ cm) of the fiber stitch satisfies the following formula (1), and the stitch length (L ₂ cm) of the inelastic fiber stitch satisfies the following formula (2). Elastic weft knitted fabric.

(In the above formula, L ₁ : stitch length [cm] of the stitch of the polyester-based eccentric composite fiber,
d ₁ : Diameter [cm] of the knitting yarn of the polyester-based eccentric composite fiber,
L ₂ : stitch length of inelastic fiber stitch [cm],
d ₂ : Diameter of inelastic fiber knitting yarn [cm],
n: Number of Tengu
m: number of wrappings. )
The stretchable weft knitted fabric according to claim 1, wherein the polyester-based eccentric composite fiber is an eccentric composite fiber of polytrimethylene terephthalate and polyethylene terephthalate. The stretchable weft knitted fabric according to claim 1 or 2, which is a stretchable weft knitted fabric dyed after knitting. When knitting the weft knitted fabric according to any one of claims 1 to 3, knitting yarn of polyester-based eccentric composite fiber or knitting yarn of other inelastic fiber is knitted into one knit needle. A method for producing a stretchable weft knitted fabric, characterized by supplying and knitting. The method for producing a stretchable weft knitted fabric according to claim 4, wherein a composite fiber that is not substantially crimp-processed is used as the polyester-based eccentric composite fiber used for knitting.

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