JPH0434052A - Stretchable warp knitted fabric and production thereof - Google Patents

Abstract

PURPOSE:To obtain the subject knitted fabric having excellent stretchability in longitudinal and lateral directions and kick back property, resistant to the falling off of elastic yarn even after repeated stretching and contraction and useful for swimming wear, etc., by arranging plural elastic yarns in a base texture composed of non-elastic yarn. CONSTITUTION:The objective knitted fabric is produced by using a warp knitting machine having at least three guide bars, supplying a non-elastic yarn to one guide bar over the whole wale, knitting the yarn over 1-2 wales in single direction in each course to form a base texture, supplying the 1st and the 2nd elastic yarns to the remaining two guide bars over the whole wale, knitting the 1st elastic yarn in a direction opposite to the non-elastic yarn over the whole course, inserting the 2nd elastic yarn in a direction opposite to the non- elastic yarn over 2-4 wales in each course or partially knitting the 2nd elastic yarn into the texture to form a warp knitted fabric and heat-treating the fabric while stretching in longitudinal or lateral direction according to the purpose.

Description

[Detailed Description of the Invention] (Field of Industrial Application) The present invention relates to a stretchable warp knitted fabric mixedly knitted from inelastic yarn and elastic yarn, and a method for manufacturing the same. The present invention relates to a method for producing a stretchable warp knitted fabric having excellent stretchability and kickback properties in the vertical and horizontal directions.

(Conventional technology) Conventionally, materials used for swimsuits, leotards, etc.
For example, circular knitted fabrics and textiles using thermoplastic false twisted crimped yarns,
Alternatively, warp knitted fabric was used, but in recent years, the lie 9. Due to the demand for a strong feel, the proportion of circular knitted fabrics and warp knitted fabrics, which are interknitted with elastic yarns such as polyurethane-based bone fibers, is increasing.In particular, with the recent fanon-yong trend, synthetic fibers such as nylon and polyester are becoming more popular. So-called two-way tricot, which is made by knitting polyester and polyurethane elastic fiber using a tricot knitting machine, is preferred. As for the two-way tricot mentioned above, polyurethane elastic fibers of 30 to 70 deniers are arranged in all wales on the back reed, and I-0/I-2
The front reed has 3
2-
It is generally knitted with a 3/I-0 swing (IX2 code), and is particularly preferred because the stitches are even and the surface of the knitted fabric is relatively smooth, making printing etc. easy in post-processing. There is.

(Problem to be solved by the invention) With the recent fitness boom, swimming clubs, etc. have become popular, and swimsuits have become worn not only in the summer but throughout the year.Also, with the spread of aerobics and jazz dance, leotards have become popular. It has come to be worn. Along with this expansion in demand, the required performance has also diversified, and it has been pointed out that the conventional two-way tricot has insufficient elasticity and kickback properties. In particular, there is a strong demand for elasticity in the horizontal direction as well as kickback performance in the vertical direction. The knitting structure diagram of the two-way tricot mentioned above is shown in FIG. 4. here,(
1) is an inelastic yarn, and ■ is an elastic yarn. Here, elasticity,
Since it is the elastic yarn that contributes to the kickback property, the elastic yarn is shown in the stitch design diagram (FIG. 5) and will be explained in more detail. If you look at the course direction (vertical direction), you can see parts that are connected by loops and parts that are underlapping. That is, it can be seen that three threads act in the longitudinal direction as a result of the double portion of the loop portion and the underlap. On the other hand, in the wale direction (horizontal direction), there is no connection of loops, and only one thread of the underwrap is acting.

For the reasons mentioned above, elasticity and kickback properties in the course direction (vertical direction) can be obtained, but they tend to be insufficient in the wale direction (horizontal direction).

In order to improve this drawback, a method of inserting elastic yarns in the form of weft threads has been considered, but this is not practical because it requires a warp knitting machine equipped with a special device for inserting weft threads. Another method is to increase the fineness of the elastic yarn to increase the elasticity and kickback properties in the course direction (vertical direction) and, as a result, to increase the elasticity and kickback properties in the wale direction (horizontal direction). This is not preferable because the dough becomes thicker. The inventors of the present invention have studied how to satisfy such diversified performance requirements, and as a result, as described below, we have found that a general warp knitting machine can be used in both the course direction (vertical direction) and the wale knitting machine without the need for special equipment. We have discovered an innovative stretchable warp knitted fabric that has good directional (horizontal) stretchability, good kickback properties, and does not become thick, and a method for manufacturing it.

(Means for Solving the Problem) That is, the present invention provides a stretchable warp knitted fabric in which a first elastic yarn and a second elastic yarn are inter-knitted in a ground structure consisting of an inelastic yarn. is knitted in all courses, the second elastic yarn arranged in all wales is inserted or partially knitted over 2 to 4 wales, and the first and second elastic yarns are in contact with each other. Using a warp knitting machine having at least three reeds and a stretchable warp knitted fabric characterized by being fused at the parts, inelastic yarn is supplied to all the wales on one reed, ■ course The first elastic yarn and the second elastic yarn are arranged and supplied to all the wales of the remaining two reeds, respectively, and the first elastic yarn is knitted over one to two wales in one direction to form a base texture. The second elastic yarn is knitted in the opposite direction to the non-elastic yarn, and is inserted over 2 to 4 wales in each course, or partially knitted in the opposite direction to the inelastic yarn. This is a method for producing a stretchable warp knitted fabric, which is characterized in that the warp knitted fabric is knitted and then heat treated while being stretched vertically or horizontally depending on the purpose.

The inelastic yarn in the present invention refers to filament yarns such as synthetic fibers, semi-synthetic fibers, regenerated fibers, and natural fibers, or spun yarns, or blended yarns of different types of fibers, such as blended yarns of polyester short fibers and cotton yarns. Either is fine. In particular, multifilament yarns made of synthetic fibers such as nylon and polyester are preferred. Further, if necessary, a spun yarn of natural fibers, a spun yarn of natural fibers and synthetic fibers, and a multifilament yarn of synthetic fibers may be used simultaneously. Although there are no particular limitations on the ground structure made of inelastic yarn as described above, I
-Denby organization organized by 0/12 and I-0/
A plain cord (half) structure knitted with 2-3 swings is particularly preferred. The fineness of the inelastic yarn is determined depending on the required thickness of the fabric, but is preferably 30 to 70 deniers.

Anything over 70 denier is not suitable for swimsuits or leotards because the fabric is too thick. On the other hand, if it is thinner than 30 denier, the fabric becomes too thin and may be transparent when worn, which is not preferable.

In addition, as the first and second elastic threads, polyether-based,
It is preferable to use polyester-based polyurethane-based elastic thread, or rubber thread may also be used. The fineness of the first elastic yarn is preferably 30 to 70 deniers, and the fineness of the second elastic yarn is preferably in a range from the same as the fineness of the first elastic yarn to approximately 100 denier.

Further, the fineness of the second elastic yarn is limited by the balance of vertical and horizontal stretching forces. If the second elastic yarn is thicker than the first elastic yarn, it is not preferable because the stretching force in the horizontal direction becomes too strong. Furthermore, if the fineness of the second elastic yarn is thinner than the fineness of the first elastic yarn, the stretching force in the horizontal direction will be weak, which is not preferable.

The above-mentioned inelastic yarn, first elastic yarn, and second elastic yarn are arranged in all the wales, and using a warp knitting machine having at least three reeds, the inelastic yarn is in the front liquid, and the first elastic yarn is in the middle reed. The knitting is performed by supplying the yarn and the second elastic yarn to the rear reed.

The warp knitting machine used may be either a tricot knitting machine or a raschel knitting machine, but it is preferable to use a tricot knitting machine.

The above-mentioned inelastic yarn has the aforementioned Denby structure (Fig. 1(a)
) or plain cord (half) structure (Figure 1 (b)
)), the ground structure is formed by interweaving all the courses. Further, the first fallible yarn supplied to the inner reed is woven in the opposite direction to the inelastic yarn of the front liquid, so that it is knitted across all the courses. The knitting structure is chain stitch (second stitch).
(a)) and Denbigh structure (FIG. 2(b)) are preferable, but plain cord (half) structure (FIG. 2(C)) may also be used. In addition, the second elastic thread supplied to the rear reed is 2
It is knitted by inserting or partially knitting over 4 wales. As a specific example, an organizational chart is shown in Figure 3.

If it extends over one wale, it does not act in a weft-like manner, so no effect on elasticity or kickback properties in the wale direction (horizontal direction) can be expected. On the other hand, if it crosses over 4 wales or more apart, the wale direction (horizontal direction)
Stretchability and kickback properties become too strong.

By heat-treating the warp knitted fabric knitted in this manner, the contact portions of the first elastic yarn and the second elastic yarn are fused. This heat treatment is preferably carried out by dry heat at 190°C or higher, particularly 195°C or higher and 200°C or lower for 30 to 50 seconds.

(Function) The stretchable warp knitted fabric of the present invention is given stretchability and kickback properties in the course direction (vertical direction) by the first neutral yarn, and the second elastic yarn is inserted or partially inserted over 2 to 4 wales. By being knitted into the underlap, it acts like a weft over the 1st to 3rd wale.
Provides elasticity and kickback properties in the wale direction (horizontal direction). Note that when the second elasticity is 2 wales apart, one yarn between the same wales becomes a weft, but 3
In the case of wales, or wales that are 4 wales apart, two and three threads run between the same wales in a weft-like manner, respectively. It may be selected as appropriate depending on the desired elasticity and kickback properties. In addition, the second elastic thread is
For example, when spanning over wales that are 5 wales apart, the four threads will run in a weft-like manner, and will have elasticity in the horizontal direction, kickback property (feelable), etc. in the course direction (vertical direction). Moreover, the width of the knitted fabric increases during knitting, making it difficult to knit.Furthermore, the fabric becomes thicker.Furthermore, the amount of second elastic yarn used increases, which is not preferable.

It is essential that the first elastic yarn swings in the opposite direction to the swing of the inelastic thread, which gives it appropriate elasticity in the course direction (vertical direction), but it is difficult to swing in the same direction. If the amount of underlap of the inelastic yarn is small during knitting (
When it becomes a knitted fabric, the elasticity is improved by the inelastic yarn. Furthermore, it is essential that the second elastic yarn also swings in the opposite direction to that of the inelastic yarn (in the same direction as the first elastic yarn). If it is in the same direction as the inelastic thread (opposite direction to the second elastic thread), the fabric will become thicker and its elasticity will decrease.

In addition, since the first elastic thread and the second elastic thread are fused at the mutual contact area, when the fabric is repeatedly stretched vertically and horizontally, the elastic thread (particularly the second elastic thread running like a weft) will not come off. Hard to occur. If the fabric is not fused, the elastic threads will come off when the fabric is repeatedly expanded and contracted vertically and horizontally, or when it is pulled with strong force, which is undesirable because the quality of the fabric will deteriorate.

Hereinafter, the present invention will be described in more detail with reference to Examples.

(Example) A 40 denier 12 filament nylon multifilament yarn was used as the inelastic yarn, a 40 denier polyurethane elastic yarn was used as the first elastic yarn, and a 30 denier polyurethane elastic yarn was used as the second elastic yarn.
Denier polyurethane elastic yarns are used, and these yarns are knitted on a Karl Mayer tricot knitting machine (KS-
3, 28 gauge/inch, 3 reeds, working width 130 inches), and knitted with the structures of Examples 1 to 6 shown in Table 1. The obtained warp knitted fabric is 195
Dry heat treatment was carried out at °C for 40 seconds, resulting in a coarse density of 106 strands/inch and a small wafer density of 60 strands/inch.

On the other hand, a knitted fabric knitted using the same yarn and knitting structure as in Example 1.2 was heat treated at 180°C for 40 seconds to have a coarse density of 106 strands/inch and a small wafer density of 60 strands/inch. Using Example 1.2 and using the same warp knitting machine, the front layer was made of nylon multifilament yarn 40 denier 1.
A full set of 40 denier polyurethane elastic yarn is supplied to the rear reed, and the front layer 2-3 is filled with 2-filament yarn.
Organize the rear reed with a swing of /l-0 and a swing of 1-0/12,
The obtained warp knitted fabric was subjected to dry heat treatment at 190°C for 40 seconds, resulting in a course density of 106 strands/inch and a small way density of 56 strands/inch.
Comparative Example 3 was prepared by finishing to inch.

Table 2 shows the stretchability, kickback properties, and elastic yarn shedding of the stretchable warp knitted fabrics of Examples 1 to 6 and Comparative Examples 1 to 3.

The elasticity was measured using an Instron tensile tester.
A test piece prepared with a length of 112.5 cm and a length of IG cm was attached to the testing machine with a distance of 10 cm between the chucks, and the weight was 2.25 kg.
Determine the elongation under load, 150% or more is Q, 150~1
00% is indicated by △. The kickback property was tested by using the same testing machine and test piece as above, attaching it to the testing machine with a distance between chucks of 10 cm, and drawing an elongation recovery curve three times up to an elongation rate of 80%. The elongation stress and recovery stress were read, and the value determined by recovery stress/elongation stress x 100 was rated 60% or more as ◎, 40% or more as 0120% or more as △.

Furthermore, the elastic yarn was checked using the tester described in 1-2.
Stretch recovery up to the g load is performed once, and visually judge the disturbance of the mesh of the inelastic yarn in the fabric. , and those that were recognized were reduced by x.

Table 2 As is clear from Table 2 above, Examples 1 to 6 had good elasticity, kickback properties, and elastic yarn pull-out, but Comparative Examples 1.2 had good elasticity and kickback properties. Although the back properties are good, since the first elastic yarn and the second elastic yarn are not fused at the contact part, the elastic yarn is inferior in terms of shedding.
The kickback performance in the horizontal direction was poor.

(Effects of the Invention) The stretchable warp knitted fabric of the present invention includes at least three types of yarns: inelastic yarns, first elastic yarns, and second elastic yarns, respectively, in the front layer, in the middle reed,
They are arranged in all the wales on the back reed, and the non-elastic yarns are knitted alternately in all the courses to form a ground structure, and the first elastic threads are knitted in all the courses with a swing in the opposite direction to the non-neutral yarns. , the second elastic yarn is inserted or partially knitted over 2 to 4 wales in the opposite direction to the inelastic yarn, so the first! I
While the T-type yarn provides elasticity and kickback properties in the course direction (vertical direction), the second elastic yarn forms 1 to 3 weft-like crossing parts between the same wales in each course, and the wale Provides directional (horizontal) elasticity and kickback properties. Moreover, since the first elastic yarn and the second elastic yarn are fused at the contact area, even if the knitted fabric is strongly pulled or repeatedly expanded and contracted, the elastic yarn may come off (disturbance of the eye surface). However, it can fully satisfy the new performance requirements for water volume and leotards.

[Brief explanation of drawings]

FIG. 1 is an example of the organization diagram of the inelastic yarn in the present invention. FIG. 2 is an example of the organization diagram of the first elastic yarn in the present invention. FIG. 3 is an example of the organization diagram of the second elastic yarn in the present invention. In addition, Figure 4 is a tissue diagram of the inelastic yarn and elastic yarn in Comparative Example 3, and Figure 5 is a stitch design diagram of the elastic yarn in Example 3, with (a) showing the technical face surface and (b) ) indicates the technical back side. 1.1M inelastic thread, 2: elastic thread, 12: first elastic thread, 1
3: Second elastic thread

Claims (1)

[Claims] 1) A first elastic yarn and a second
In a stretchable warp knitted fabric in which elastic yarns are interknitted, the first elastic yarn is knitted in all courses, and the second elastic yarn arranged in all wales is inserted over 2 to 4 wales,
Alternatively, a stretchable warp knitted fabric characterized in that it is partially knitted, and the first and second elastic yarns are fused to each other at their contact portions. 2) Using a warp knitting machine having at least three reeds, inelastic yarn is supplied to all the wales on one reed, and is knitted over 1 to 2 wales in one direction for each course to knit the ground structure. The first elastic yarn and the second elastic yarn are arranged and supplied to all the wales of the remaining two reeds, and the first elastic yarn is woven in the opposite direction to the inelastic yarn over the entire course, and the first elastic yarn is woven in the opposite direction to the inelastic yarn. The second elastic yarn is also swung in the opposite direction to the non-elastic yarn and inserted or partially knitted over 2 to 4 wales in each course to knit the warp knitted fabric, and then warp knitted fabric can be knitted depending on the purpose.
A method for producing a stretchable warp knitted fabric characterized by heat treating it while stretching it horizontally.