JPH06228849A - Bi-directionally elastic warp knitted fabric - Google Patents

Abstract

PURPOSE:To prevent curl of selvedge in bidirectionally elastic warp knitted fabric knitted so that elastic yarn is retained in warp by inserting the elastic yarn as weft into warp knitted structure using non-elastic yarn as warp and forming a loop. CONSTITUTION:In the selvedge of a warp knitted fabric obtained by inserting elastic yarn 2 as weft into the warp knitted fabric structure using non-elastic yarn as warp 1 and forming a loop 2a along a stitch 1a so as to retain the elastic yarn in warp, the third yarn 3 consisting of a non-elastic yarn is knitted into knitted structure consisting of warp and weft in a knitting structure having underlapping between one or more needles and stiffness is increased by making the density in this part large to prevent curl of the selvedge.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bidirectional elastic warp knitted fabric in which elastic forces act substantially equally in both warp and weft directions.

[0002]

2. Description of the Related Art A warp knitted fabric, unlike a woven fabric, has elasticity in both longitudinal and transverse directions. However, in order to impart higher elasticity and elongation recovery, an elastic yarn such as spandex yarn (elastic yarn) is used. It was used for warp knitting.

However, the warp knitted fabric in which elastic yarns are used for a part or all of the warp yarns has a drawback that it is difficult to obtain a substantially uniform elastic force in the warp direction and the weft direction.

Therefore, in recent years, in knitting by a tricot machine equipped with a weft insertion device, an elastic yarn such as a spandex yarn is used as the weft, and the weft is guided under the needle tip at the tack position of the needle or the weft insertion position to form a loop. A bidirectional elastic warp knitted fabric is proposed in which the elastic force acts substantially equally in both warp and weft directions, which is formed by forming the (For example, Japanese Patent Publication No. 1-30938).

This warp knitted fabric has high elasticity in both longitudinal and transverse directions, and its elastic force acts substantially evenly.
It is preferably used for foundations and active sports.

[0006]

However, in the knitting process of the above bidirectional elastic warp knitted fabric, high elasticity, particularly elastic yarn is used for the wefts in the ears at both ends of the knitted fabric (garment) immediately after knitting. Due to the high elasticity due to this, the contraction in the weft direction becomes large, and the curl of the ears becomes severe.

Therefore, generally, in winding the knitted fabric after knitting, a temple device that is actively driven is used to curl the ear portion while curling it, but a special temple is used. In addition to requiring a device, curling of the ears of the knitted fabric itself is not prevented, which causes problems such as wrinkles in the next processing step.

In view of the above, the present invention is a bidirectional elastic warp knitted in such a manner that an elastic yarn inserted as a weft yarn into a warp knitted fabric having a non-stretchable yarn as a warp is loop-formed and held so as to be held in the stitch of the warp. In the ground, this is done to prevent curl of the ears of the knitted fabric itself.

[0009]

SUMMARY OF THE INVENTION In order to solve the above problems, the present invention provides a warp knitted fabric in which a non-stretchable yarn is used as warp yarns and elastic yarns are inserted as weft yarns to form loops along the stitches. A warp knitted fabric based on the retained knitting fabric, in the ear portion of this warp knitted fabric, in the knitting structure of the warp and the weft,
It is characterized in that a third yarn made of a non-stretchable yarn is knitted in a knitting structure having underlapping of one stitch or more.

[0010]

According to the above bidirectional elastic warp knitted fabric, the basic knitting structure is such that the loop of the elastic yarn inserted as the weft into the warp knitting fabric structure by the warp forms the stitch together with the warp and connects in the warp direction. At the same time, since it is continuous in the weft direction as well, it possesses high elasticity and elongation recovery that work approximately equally in both directions.

In addition, in the ears at both ends of the warp knitted fabric, a third yarn made of a non-stretchable yarn is further knitted in a knitting structure having an underlap of one stitch or more in addition to the basic knitting structure described above. Because of this, the ears are thicker and denser than the other parts to increase the rigidity, and the elasticity of the elastic threads is suppressed, and the ears are prevented from curling due to contraction.

[0012]

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

FIG. 1 shows a bidirectional elastic warp knitted fabric according to the present invention.
FIG. 2 shows a basic knitting structure diagram, and FIG. 3 shows an enlarged knitting structure diagram for preventing curl of the ears.

In the figure, (1) is a non-stretchable thread of synthetic fiber or natural fiber having little or no stretchability,
For example, a warp made of nylon yarn, cotton yarn, or the like, and the warp (1) is a known warp knitted fabric structure that underlaps for one or more stitches, for example, one stitch for one course continuously in the warp direction. Underlap wrapping is used to create stitches, that is, stitches (1a) are made in a certain course, and the stitches (1a) are made in the next course by the adjacent wales, and then the original wales are returned in the next course. Stitch (1
It is knitted by a so-called 1 × 1 tricot knitting (closed stitch) for making a).

(2) is a weft yarn made of spandex yarn or other elastic yarn coated with synthetic fibers, which is inserted into the warp knitted fabric structure of the warp yarn (1) and has stitches (1a).
A loop (2a) is formed so as to be held by the warp (1).

That is, the warp knitted fabric having the above-mentioned knitting structure is
The weft yarn (2) made of elastic yarn is guided under the needle tip at the tuck position of the needle or the weft insertion position during the stitch forming process in the warp knitting, and during the stitch escape process, the needle hook and knockover and A loop is formed by a holding down sinker, and then the loop is knitted along the stitch of the warp knitted fabric structure by the warp (1) to form a warp (1).
It can be manufactured by knitting so as to hold it.
As a result, the weft yarn (2) is covered with the warp yarn (1) on both sides of the warp knitted fabric, and is knitted so that the loop (2a) together with the stitch (1a) of the warp yarn (1) forms a stitch. Will be retained.

(A) shows a part of the basic knitting structure by the warp (1) and the weft (2).

(3) In the ears (4) at both ends of the warp knitted fabric, that is, in the ears (4) within a range of about 15 inches from both ends of the fabric, the warp (1) and the weft (2) are used. It is a third yarn added to the basic knitting structure, and is made of a non-stretchable yarn such as a synthetic yarn or a natural fiber such as a nylon yarn having almost the same or little stretchability as the warp yarn (1).

This third yarn (3) has a knitting structure which is continuous in the warp direction like the warp yarn (1) and has underlapping of one stitch or more for each course, that is, a stitch is formed in a certain course. , In the next course, transition to adjacent wales or wales separated by a few wales to make stitches, and then in the next course to return to the original wales and make stitches.

In the embodiment shown in FIGS. 1 to 3, 1 of the warp (1) is used.
The 1 × 2 tricot knitting is performed by underlapping that extends between two stitches in the same direction, that is, the 1 × 2 tricot knitting. Of course, the third yarn (3) may be knitted by underwrapping in the direction opposite to the underwrapping of the warp yarn (1) having the base structure. (B) shows a portion of the knitting structure in which the third yarn (3) is knitted.

As an example of producing the above-mentioned knitting structure portion (b), as shown in FIG. 4 (a), the entire area of the selvage portion (4) within a range of about 15 inches from the material end is covered with the third yarn (3). It is also possible to make a knitting structure in which the inner half of the ear portion (4) is knitted with a third yarn (3) as shown in (b) of FIG. Can also be part of the knitting structure of
Further, as shown in FIG. 7C, a portion of the knitting structure in which the third yarn (3) is knitted can be formed by separating into a plurality of threads, and the other part can be used as the basic knitting structure.

In any of these cases, due to the presence of the portion (b) of the knitting structure in which the third yarn (3) is knitted, the density of the ear portion (4) increases and the rigidity increases, so that the ear Curling of the part (4) can be prevented.

In the embodiment shown in FIG. 5, a warp (1) made of a non-stretchable yarn is continuous in the warp direction and underlapped between two stitches for each course to form a stitch 1 × 2. The knitting is based on a warp knitted fabric, which is knitted with a tricot knitting structure and is knitted so that the wefts (2) form loops along each stitch in the same manner as above and held by the warp (1). In the part (4), the same third yarn (3) as described above is continuously knitted in the warp direction so as to be underlapped over three stitches for each course to form a stitch and knitted.

The third yarn (3) in the above is the warp (1)
It is possible to knit with a knitting structure that is the same as underlapping between two needles or underlapping between one needle, or underlapping in the direction opposite to the warp (1).

Also in this embodiment, since the thickness and the density of the selvage (4) are increased by the weaving of the third yarn (3) to increase the rigidity, the elasticity due to the insertion of the weft made of the elastic yarn is suppressed. As a result, the curl of the ears is suppressed.

As the elastic yarn used in the above weft yarn (2), not only spandex yarn, but also bare elastic filament yarn is preferably used, of which elongation is at least 250%, preferably 450 to 650. Elastic filament yarns having a% elongation are preferred. The thickness is preferably 22 to 77 dtex or 20 to 70 denier.

(Example) A tricot knitting machine with a weft insertion device (gauge 28E, knitting width 130 inches) was operated under the following specification conditions to knit a bidirectional elastic warp knitted fabric according to the present invention.

Material guide bar I (warp): nylon filament yarn 4
0 denier / 12f Guide bar II (Third thread): Nylon filament thread 4
0 denier / 12f weft yarn: polyurethane yarn 40 denier /
4f ・ Number of threads Guide bar I (warp): 3600 threads Guide bar II (third thread): 72 threads (360 threads × 2) Weft threads: Insert one thread in each course weft direction ・ Approximate number of stitches: 70 courses / inch The above-mentioned warp knitted fabric is 101 courses / inch, 56 wales / in the basic knitting structure after completion of the finishing process.
It had inches and had a density of 146 g / mm ² . Also, in the ears, 370 whales and about the same number of courses
There is a density of g / mm ² , which increases the rigidity of the ears,
Curling of the ears could be suppressed and the film could be wound as it was. Also, wrinkles did not occur in the subsequent processing steps.

[0029]

As described above, according to the present invention, a bidirectional elastic warp knitted in which elastic threads inserted as wefts in a warp knitted fabric structure are looped and knitted to give a substantially uniform elastic force in both warp and weft directions. In the ground, since the third yarn is knitted in the ears, curling of the ears at both ends of the knitted fabric can be prevented. Therefore, it is possible to wind the film as it is without using a temple device or the like, and it is possible to prevent the occurrence of wrinkles in the ears in the subsequent processing step.

[Brief description of drawings]

FIG. 1 is a knitting structure diagram (a) and a schematic plan view (b) of a warp knitted fabric showing one embodiment of the present invention.

FIG. 2 is an enlarged view of a basic knitting structure of the warp knitted fabric.

FIG. 3 is an enlarged view of a knitting structure in which a third yarn is knitted in an ear portion.

4 (a), (b) and (c) are schematic plan views showing an example of creating a knitting structure in which a third yarn is knitted in an ear portion.

FIG. 5 is a knitting structure diagram of a warp knitted fabric showing another embodiment.

[Explanation of symbols]

 (1) Warp yarn made of non-stretchable yarn (1a) Stitch (2) Weft yarn made of elastic yarn (2a) Loop (3) Third yarn made of non-stretchable yarn (4) Ear part (a) Basic knitting structure Part (b) Part of the knitting structure in which the third thread is woven

Claims (1)

[Claims] 1. A warp knitted fabric based on a knitting structure in which elastic yarns are inserted as weft yarns into a warp knitted fabric structure in which non-stretchable yarns are used as warp yarns to form loops along the stitches and are held by the warp yarns. Then, in the ear portion of the warp knitted fabric, the knitting structure of the warp yarn and the weft yarn is knitted with a third yarn made of a non-stretchable yarn in a knitting structure having underlap of one stitch or more. A characteristic bidirectional elastic warp knitted fabric.