JPH0770894A - Elastic warp-knitted fabric and its production - Google Patents

Abstract

PURPOSE:To provide an elastic warp-knitted fabric having wellbalanced stretchabilities in warp and weft directions and relatively strong elastic force, keeping good stretch recovery when used in clothes and exhibiting cloth tightening force with comfortable wearability by knitting an elastic yarn by two needle stitching method. CONSTITUTION:An elastic yarn 1 of 20-70 de is placed on the 1st guide bar and a non-elastic yarn 2 is placed on the 2nd guide bar of a warp-knitting machine and the elastic yarn 1 of the 1st guide bar is stitched to form a two needle stitch fabric at a course density of 40-70 courses/inch on the knitting machine and 100-120 courses/inch in finished state and obtain a warp-knitted fabric having a Q1/Q2 ratio of 2/3 to 1 wherein Q1 is the warp-direction stress and Q2 is the weft-direction stress in stretch recovery.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an elastic warp knitted fabric having a substantially uniform stretchability in both warp and weft directions and a relatively strong elastic force, and a method for producing the same.

[0002]

BACKGROUND OF THE INVENTION A warp knitted fabric, unlike a woven fabric, has elasticity in both longitudinal and transverse directions, but in the case of imparting higher elasticity and elongation recovery, a spandex yarn, etc. Elastic thread (elastic thread)
Is used for the warp.

For example, an elastic warp knitted fabric produced by interlacing an elastic fiber yarn and a non-stretchable yarn, in particular, a fabric in which a stitch is formed by an elastic yarn, has elasticity in the longitudinal and transverse directions due to the characteristics of the elastic yarn. It is commonly known as two-way land. Since this warp knitted fabric has high elasticity in both longitudinal and lateral directions and its elastic force acts substantially evenly, it is suitably used for swimming wear, foundation, and active sports.

However, in a warp knitted fabric in which elastic yarn is used as one warp yarn of one of the two reeds of the warp knitting machine, as shown in FIG. 7, the elastic yarn (1) such as polyurethane fiber is 1 × 1 tricot knitted fabric. (1st stitch), the synthetic fiber yarn (2) is knitted in a so-called rock knit structure in which 1 × 2 tricots are knitted. In such a conventional knitted product, the elongation balance in the warp direction and the weft direction of the base fabric is And the fabric tightening force in the stretched state (tension and restoring force when the stretched fabric tries to restore) is inferior.

Further, as a warp knitted fabric having excellent stretchability in both warp and weft directions, Japanese Patent Application Laid-Open No. 62-238852 discloses:
It has been proposed that an elastic yarn is arranged on the first reed on the back side, and a non-stretchable synthetic fiber yarn is arranged on the second reed on the front side and knitted by knitting the yarn.

However, even in the case of the warp knitted fabric of this proposal, the elastic yarn is the one in which the first stitch is formed for each course, and the non-stretchable synthetic fiber yarn is the second stitch. However, there is a drawback that the elongation balance of the warp and weft is poor and it is difficult to obtain a substantially uniform function of elastic force in the warp direction and the weft direction.

Further, it has been attempted to increase the stretchability in both longitudinal and transverse directions and to increase the fabric tightening force in the stretched state by knitting the elastic yarn in two stitches. However, sufficient stretchability is maintained in both the warp and weft directions. However, if the cloth tightening force in the stretched state is too strong, it will not be possible to obtain comfortable wearing comfort when used for clothing.

The present invention has been made in view of the above, and in particular, by knitting the elastic yarn in two stitches, the elongation balance in both directions of the warp and weft is good, and the elastic force, that is, the cloth tightening force is relatively strong. The present invention aims to provide a practicable elastic warp knitted fabric that is excellent in elongation recovery (fabric correction function) and that is comfortable to wear and a manufacturing method thereof.

[0009]

A first invention is an elastic warp knitted fabric for solving the above-mentioned problems, which is a warp knitted fabric knitted with an elastic yarn and a non-stretchable yarn, and the elastic yarn is 20-7
The yarn is 0 denier and is double-knitted. The finished course density is 100 to 120 courses / inch, and the ratio of the stress in the warp direction (Q1) at the time of elongation recovery and the stress in the weft direction (Q2) (Q2 / Q1) is 2/3 to 1. That is, the ratio of the latitudinal stress (Q2) to the longitudinal stress (Q1) is set to 2/3 to 1.

According to the elastic warp knitted fabric described above, substantially uniform high stretchability is obtained in the warp direction, the weft direction, and the diagonal direction, and the stretch recovery property provides an excellent fabric correction function and the stretch The tension at the time of recovery (cloth tension) is substantially equal to the tension at extension, and the tension is an elastic warp knitted fabric in a proper range.

A second aspect of the present invention relates to the method for producing the elastic warp knitted fabric, wherein the first reed of the warp knitting machine has 20 to 7
An elastic yarn of 0 denier is arranged, a non-stretchable yarn is arranged on the second reed, the elastic yarn of the first reed is made into a second stitch, and the machine course density is 40 to 70 courses / inch. The finished course density is set to 100 to 120.

By knitting as described above, good elasticity is provided which is substantially even in both the warp and weft directions and the diagonal direction, and the elasticity ratio in which the stress ratio upon extension recovery is within the above range. A warp knitted fabric is obtained.

In the above, the stress ratio (Q2
/ Q1) is once 80 in the warp and weft directions through the knitted fabric.
% After extended, the ratio of tensile stress when returned to 50% elongation state (i.e. fabric tightening force), typically, the warp direction of the stress (Q1) is 250 to 300 (g / cm ^2), weft direction of stress (Q2) is preferably in the range of 200~300 (g / cm ^2).

That is, if the stress in both the longitudinal and latitudinal directions is larger than the above value, discomfort occurs when it is used in clothes, and if it is less than the above value, the cloth tightening force at the time of elongation recovery, that is, the elongation recovery property becomes poor. . If the stress ratio is smaller than the above, the longitudinal and lateral elongation balance is poor, and if the stress in the weft direction is larger than the above and is larger than the above,
Problems such as difficulty in knitting tend to occur.

As the elastic yarn, in addition to spandex yarn, bare elastic filament yarn is preferably used, and among them, elastic filament yarn such as polyurethane having an elongation of 250% or more is preferable. The elastic yarn has a thickness of 20 to 70 denier, and particularly preferably 20 to 70 denier.
A 50 denier one is used.

That is, when the elastic yarn to be double-knitted is difficult to knit with the thinner yarn, and when it is thicker than the thick yarn, the elastic force becomes too strong, and the comfort as clothing becomes poor. .

In order to obtain a finished course density of 100 to 120 courses / inch with the above stress ratio, the on-machine course density must be 40 to 70 courses / inch. When the on-board course density is higher than the above,
Even if the elastic yarn is the above-mentioned denier yarn, the finished course density is also higher than 100 to 120 courses / inch, the elastic force becomes too strong, and the wearing comfort becomes poor.

The non-stretchable yarn is a synthetic filament yarn of 20 to 80 denier, preferably 20 to 50 denier, and synthetic fiber yarn such as nylon yarn is preferably used and knitted in a tricot structure.

[0019]

Embodiments of the present invention will now be described with reference to the drawings.

FIG. 1 shows an enlarged knitting structure diagram of an example of an elastic warp knitted fabric according to the present invention.

In the figure, (1) is an elastic yarn of 20 to 70 denier made of elastic yarn such as polyurethane, spandex yarn covered with synthetic fiber and the like.
(2) is a so-called non-stretchable yarn having almost no elasticity or only a little elasticity, for example, 20 to 80 such as nylon yarn.
Made of denier synthetic fiber yarn.

The elastic yarn (1) is arranged in a back reed of a warp knitting machine having two reeds, that is, a half set of 1 in and 1 out on the first reed and is overlapped between two stitches. It is woven by knitting. Further, the non-stretchable yarn (2) is arranged in a full set on the front reed, that is, the second reed, and is underlapped across two needles by swinging in the opposite direction to the elastic yarn (1), that is, 1 × 2. It is woven in the tricot edition.

In particular, in the case of the present invention, in the knitting, the on-board course density is knitted at 40 to 70 courses / inch, and the finished course density is set to 100 to 120 courses / inch.

Elastic yarn (1) for the first reed on the back side
Is knitted by swinging in a direction opposite to that of the non-stretchable yarn (2) of the second reed on the front side, but in addition to this, various knitting structures of two stitches are possible. 2 (a)-
(F) illustrates the knitting structure. In either case,
The elastic yarn (1) can be arranged on the first reed in a full set or knitted in a half set.
Above all, for example, in the knitting structures (a) to (d) in which the sinker loops move to the adjacent wales at an angle of approximately 30 ° to 60 ° adjacent to each other, the stretchability becomes substantially even in the diagonal direction.

The non-stretchable yarn (2) can also be knitted with various knitting structures, and can be knitted with various knitting structures such as changing the swing width and changing the open and closed stitches. It is possible. 3A to 3D exemplify the knitting structure. The knitted fabric of FIG. 1 has a knitting structure according to the above (a) and (A). .

In any knitting structure, the on-machine course density is knitted at 40 to 70 courses / inch and the finished course is knitted at 100 to 120 courses / inch. For example, in the structure shown in FIG. 1, when using the knitting machine of KARL MAYER, each of the on-machine course density, the elastic yarn of the reed (B) on the back side and the non-stretchable yarn of the reed (F) on the front side. The runner length, the finish course, and the finish wale are preferably set as shown in Table 1 below.

[0027]

[Table 1]

Here, the runner length is the yarn supply length per unit course, and is the yarn supply length with 480 courses (1 rack) as one unit, and is also simply called runner or run-in.

By knitting as described above, the finished course density becomes 100 to 120 courses / inch,
The stress in the warp direction at the time of elongation recovery (when it is once expanded to 80% and then returned to the 50% expanded state) is 250 to 300 (g.
/ Cm ² ), the stress in the weft direction is 200 to 250 (g / cm 2
² ), a warp knitted fabric having a stress ratio in the warp and weft directions in the range of 2/3 to 1 can be obtained.

(Example) On the first reed (B) on the back side,
A 35 denier polyurethane elastic yarn (1 filament) is used as the elastic yarn (1), and a 50 denier, 12 filament nylon filament yarn is used as the non-stretchable yarn (2) in the second reed (F) on the front side. It was used and knitted under the knitting conditions and organization as shown in Table 2 below.

Example 1 in Table 2 shows the case of the knitting structure of FIG. 1 in which elastic yarns are arranged in a 1-in-1-out half set, and in Example 2, elastic yarns are arranged in a full set. The figure shows the case of organization. The comparative example is knitted with a so-called rock knit structure shown in FIG.

[0032]

[Table 2]

Further, the tension (extension force) when the warp knitted fabric was stretched in the warp direction and the tension (tension force) when the stretch was recovered were measured. The ground was as shown in FIG. 4, the knitted fabric of Example 2 was as shown in FIG. 5, and the knitted fabric of Comparative Example was as shown in FIG.

The measuring method is the cut strip method JI.
S L 1013 (constant speed extension type) was used.

As is clear from these measurement results, the knitted fabric of the embodiment knitted as described above stretches smoothly as compared with the conventional product, and the fabric tightening force (the stretched fabric tries to return to its original state). The tensile force when doing) was not so different from the stretching force, and the tension was about the same in both the longitudinal and latitudinal directions. In the case of the comparative example, the occurrence of misalignment was observed in the knitted fabric in about 10% in the subsequent processing step, but in the case of the example, the occurrence of misalignment was hardly observed.

[0036]

As described above, according to the present invention, the elongation balance in both the longitudinal and latitudinal directions is good, and the elongation recovery is excellent.
The elastic warp knitted fabric which has the fabric tensioning force which is not so different from the stretching force and which is excellent in the fabric correction function can be obtained.

Particularly, in the case of the present invention, by setting the denier of the elastic yarn and the on-machine course density and the finished course density,
Particularly when used for clothes, it is possible to obtain an appropriate cloth tightening force, and it is possible to secure a comfortable wearing comfort while maintaining a good elongation recovery property, that is, a cloth correction function.

[Brief description of drawings]

FIG. 1 is an enlarged view of a part of a knitting structure of an elastic warp knitted fabric according to an embodiment of the present invention.

2 (a) to (f) are organization charts each illustrating a knitting organization of an elastic yarn.

FIG. 3 is a structure diagram illustrating the knitting structure of each of the non-stretchable yarns of (A) to (D).

FIG. 4 is a graph obtained by measuring the extension force (tensile force during extension) and the tension force (tensile force during extension recovery) of an elastic warp knitted fabric (Example 1) in which elastic yarns are arranged in half sets and knitted.

FIG. 5 is a graph in which the stretching force and the tightening force of an elastic warp knitted fabric (Example 2) in which elastic yarns are arranged in a full set and knitted are measured.

FIG. 6 is a graph in which the stretching force and the tightening force of the elastic warp knitted fabric by the conventional rock knit are measured.

FIG. 7 is an enlarged view of a knit structure showing an example of a conventional elastic warp knitted fabric made of rock knit.

[Explanation of symbols]

 (1) Elastic yarn (2) Non-stretchable yarn

Claims (2)

[Claims] 1. A warp knitted fabric interwoven with an elastic yarn and a non-stretchable yarn, wherein the elastic yarn is a yarn having a denier of 20 to 70 and is double knitted, and the finished course density is 100 to 120.
Course / inch, the ratio (Q2 / Q1) of the stress (Q1) in the warp direction and the stress (Q2) in the weft direction at the time of extension recovery is 2/3 to 1
An elastic warp knitted fabric characterized by: 2. A warp knitting machine, wherein a first reed is provided with an elastic yarn of 20 to 70 denier, a second reed is provided with a non-stretchable yarn, and a first reed elastic yarn is a second stitch structure. And the on-board course density is 40-
We knit at 70 courses / inch and finish course density is 10
A method for manufacturing an elastic warp knitted fabric, which is characterized in that it is 0 to 120 courses / inch.