JPH03213542A - Warp knitted stretch cloth of striped pattern - Google Patents

Abstract

PURPOSE: To obtain the subject striped patterned warp-knitted stretchable fabric that has the striped pattern appearance and comprises a combined knitted fabric of elastic yarns and non-elastic yarns by knitting the adjacent ridge areas with elastic yarns having different elastic properties from each other. CONSTITUTION: The objective warp-knitted stretchable fabric is produced by knitting the adjacent ridge areas with different elastic yarns in their loading from each other repeatedly every repeated ridge areas. The ridge in the first adjacent area is constituted with the stitches of non-elastic yarns that are knitted with the first set of the elastic yarns and the ridge of the second adjacent area is constituted with the non-elastic yarns together knitted with the elastic yarn in the second set. The elastic yarns in the adjacent areas are required to sufficiently differ in its elastic properties so that they may form the stitch loops in the first area different in tightness from the second areas.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to warp-knit stretch fabrics consisting of elastomeric and inelastic yarns.

More specifically, the present invention provides a method for creating a desired striped pattern.
) relates to such fabrics in which two types of elastomeric threads are placed in separate areas to provide an effect.

To summarize the invention, adjacent wale
) is knitted with elastic yarns of different elastic properties to provide a warp-knitted stretch fabric with a repeating pattern of stripes.

Description of the Prior Art Fabrics containing elastomeric and non-elastomeric yarns are described, for example, in Duckoff, U.S. Pat. No. 2,595.77.
It is known as No. 8. Typically these fabrics include adjacent bands of elastic and inelastic threads. Eggleston U.S. Pat. No. 3.676.
It is known to knit and weave patterned fabrics using inelastic yarns of different properties, such as polyester yarns of different shrinkage properties, as disclosed by No. 906.

Warp-knit stretch fabrics made from elastic and inelastic yarns are known. Stitch of such fabric
is generally a closed loop tricot stitch structure when made on a warp knitting tricot machine, and a laid-in structure when made on a Raschel warp knitting machine.

Cooper et al., U.S. Pat. No. 3.069.
No. 885 exemplifies a closed-loop tricot-stitch style, and Lesl, ey U.S. Pat.
No. 552.154 exemplifies the laid-in style.

Fabrics made with these stitching styles are commonly classified as "stretch fabrics." However, such stretch fabrics have smooth surfaces and generally lack surface interest.

It is an object of the present invention to provide a stretch fabric having a surface interest, in particular a striped appearance.

SUMMARY OF THE INVENTION The present invention provides a set of inelastic yarn stitches having repeating areas of adjacent ridges, the ridges of a first said adjacent area being interwoven with a first set of elastic yarns. (knit)
and the ridges of a second adjacent region are formed by a stitch of inelastic yarn interwoven with a second set of elastic yarns, and the elastic yarns of the adjacent regions are sufficiently different in elastic properties. The stitching and tightness of the second area (
To provide a warp-knitted stretch fabric, in which stitches in a first area differ in terms of stiffness, thereby providing a distinct visible banding pattern in the knitted fabric. The number of vertical grains in each adjacent area can be equal or different;
and generally ranges from as few as 1 to greater than 100, with about 5 to 20 being preferred. In the preferred fabric of the invention, the elastic threads form continuous 1-2, 1-0 stitches, the inelastic threads form continuous 1-0, 2-3 stitches, and the alternating areas form each It has a width of 10 ridges.

Preferably, the elastic yarns in the first adjacent area of the ridges have a loading force of at least 50% at 200% elongation than the elastic yarns in the second adjacent area of the ridges, most preferably. They differ by at least 80%. Preferably the elastomeric thread is a spandex thread and the inelastic thread is nylon. The present invention also provides a method of manufacturing the warp-knit stretch fabric described above. In the method, two sets of yarns with different elastic properties are fed to the same guide rod or different guide rods of a warp knitting machine with the same extension, and - the inelastic yarns of the set are fed to the same or different guide rods of a warp knitting machine, and Feeded into a guide rod, the threads of each set of elastic threads are combined with the inelastic threads to form a repeating pattern of adjacent ridges to give a striped effect to the fabric.

The invention will be better understood with reference to the accompanying drawings.

DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS In accordance with the present invention, a warp-knit stretch fabric is provided with a surface interest in the form of alternating stripes.

The striped pattern is the result of differences in the elastic properties of the particular elastic threads used to knit adjacent areas of the fabric ribs.

As pointed out in the "Description of the Prior Art", conventional warp knit stretch fabrics are knitted with elastic and inelastic yarns.

Conventional warp-knit stretch fabrics typically exhibit a uniform appearance. The warp-knit stretch fabric of the present invention is also made of elastic and inelastic yarns, but the fabric is knitted with repeating areas of ridges in which the elastic yarns in adjacent areas have different loading forces from each other. ing. For example, the ribs in such a first adjacent area are formed by stitches of a set of inelastic yarns interwoven with a first set of elastic yarns. The ridges in the second adjacent area are formed by a stitch of inelastic yarn interwoven with a second set of elastic yarns. The non-elastic threads in the second and second regions can be of the same or different materials. However, the elastic threads of adjacent areas must be sufficiently different in their elastic properties so as to form a loop of stitches in a first area that is different in tightness than a loop of stitches in a second area. . Differences in stitch tightness are thought to be the cause of repeating striped patterns in the fabric.

It has been found that a convenient measure of the difference in the elastic properties of elastic yarns in adjacent areas is the difference in the loading force of the elastic yarns when stretched to 200%, measured as described below. Since all the elastic yarns used to warp knit the fabric are usually fed into the knitting machine at the same elongation rate, the difference in the force of the different elastic yarns will be This makes a difference in the tightness of the stitches obtained. Therefore, a ridge formed from one elastic thread and an inelastic thread is different from a ridge formed from an elastic thread with different elastic properties when the ridge is formed using the same stitch pattern and the same inelastic thread. The tightness of the stitches differs even when The difference in the tightness of the stitches is clear from the enlarged photo of the fabric surface. For example, in Figure 4,
The stitches in the area of the ridge labeled 20 are needle
dle) Even if all stitches are knitted with the same inelastic yarn using the same number of needles per cm on the bar, using the same elongation elastic yarn, and using the same gauge guide rod, 30 The stitches in the area are tighter than the stitches in the area. Although both zones contain the same number of ridges, zone 30 is approximately 25% wider than zone 20.

The term repeating adjacent areas of ridges as used herein is not intended to be limited to exactly two alternating areas of the same number of ridges. It is contemplated that many variations of such tissues fall within the scope of the present invention. For example, several different adjacent sub-regions successively across the width of the fabric form one of the repeating regions (i.e., repeating units across the width of the fabric). be able to. Each region or its sub-regions can vary from one ridge width to many ridge widths. Fabrics of the invention in which each area is only one rib width exhibit a striped pattern that is not easily distinguishable from stripes in fabrics made with areas that are five or more rib widths. . For clearly visible stripes, an area that is at least five ridge widths is required. - More ridges per area will make the stripes wider and even more distinct. Although area widths of 100 or more ridges may be satisfactorily used, preferred ridges per area are usually in the range of 5 to 20.

Elastic yarns such as "spandex" or elastane yarns suitable for use in the present invention are commercially available. Such threads can be repeatedly stretched by at least 200% without breaking and then return to approximately their original length. “Spandex” is less (tomo 85
Defined as a long chain synthetic polymer consisting of % by weight of polyurethane segments.

Any non-elastic yarn capable of being knitted is suitable for use in the present invention. These threads usually have 10
Inelastic yarns may be synthetic or natural fibers, and may be crimped if desired. Typical inelastic yarns include yarns made from cotton, wool, nylon, polyester, acrylic polymers, cellulosic polymers, and the like.

To produce the warp knitted stretch fabric of the invention, elastic yarns are fed to the warp knitting machine as alternating bands. The elastic thread can be supplied from separate beams or from a single spool wound with alternating bands of different elastic threads. The band may consist of any number of threads. The elastic thread is then fed to a single guide rod or to multiple guide rods. The inelastic yarns are usually supplied from two spools or warp sets, although more than one can be used, and are fed to the first guide rod of the warp knitting machine.

In a preferred method of the invention, a separate guide bar is used for each type of yarn used to knit the fabric. How to knit the fabric will be explained with reference to the drawings. In Figure 1, the knitting needle positions for each of a number of successive courses are determined using positions between columns of dots marked with Arabic numerals customary for warp knitting. is represented in a conventional manner by a horizontal sequence of points.

A suitable fabric is produced on a tricot or similar warp knitting machine. As illustrated in the stitch diagram in Figure 1,
The machine has one side bar and three guide bars. The needle bar is equipped with knitting needles, the number of which can vary depending on the cage of the machine. Each guide rod has a number of thread guides corresponding to the number of needles on the copper rod. The guide bar can shog one or more needle distances in both longitudinal directions of the needle bar. The guide bar can also swing transversely to the needle bar to pass the thread guide between the needles. The combined motion of rocking and wobbling makes it possible to form stitches and knits in preset desired patterns. The stitch pattern of FIG. 1 is such that when the guide bar is threaded as indicated in Example 1, it results in a striped warp-knit stretch fabric, the front and back sides of which are respectively This is shown in the enlarged photographs in Figures 2 and 3. The terms "in" and "out" when referring to threading a guide rod respectively refer to whether a particular successive position on the guide rod is carrying the thread (i.e. in).
or empty (ie, out). When we refer to a guide as fully threaded, we mean that all guide rod positions are threaded (ie, in)1.

In order to establish areas of ridges that appear as stripes in the final knitted product, it is necessary, as previously pointed out, that the elastic properties of the elastic yarns in adjacent areas are different. A convenient way to measure these differences is generally ASTM method D273.
1-72, using an Instron testing machine to measure the stress strain characteristics of elastic yarns. Measurements are taken on a 2 inch (5,1c11) long sample.

The sample is stretched from 0% to 300% at a rate of 800% per minute and then stretched back to 0%. The force required to stretch the sample to 200% elongation (during the first stretch) is measured. Load force at 200% elongation is then decinewton/1
Ex (based on the initial unstretched tex). This loading force is a convenient indicator of the difference in the elastic properties of the elastic yarns used in adjacent areas of the ribs in the fabric. Generally, even a small difference in elastic properties is sufficient to produce the desired striped pattern. Preferably the difference in load 2 gravity at 200% elongation between elastic yarns used in adjacent areas of the fabric is at least 50%, most preferably at least 80%.

The invention will be further illustrated by the preferred embodiments of the following examples. These examples are presented for illustrative purposes only and are not intended to limit the scope of the invention, which is defined by the appended claims.

Examples 1 and 2 These examples illustrate two warp knits of the present invention, tricot,
The method for manufacturing a striped stretch fabric is illustrated. Additional samples of ridges outside the scope of the present invention were manufactured for comparison purposes. All fabrics have three guide rods and one needle bed
Manufactured by a warp knitting machine with The stitch style used is illustrated in Figure 1 and the guide rod threading is summarized in Table 1 below. In the table, the samples of the invention are designated with Arabic numerals corresponding to the example number, and the comparative fabrics are identified with lower case letters (ie, comparative samples a through f).

For each fabric, an inelastic yarn, a 44 dtex, 13 filament nylon yarn, was fed to the front guide bar of the knitting machine (bar 1 in Table 1). The front guide rod was fully threaded and programmed to form 1-0, 23 stitches on all sample fabrics. For each fabric, the elastic thread, which is a spandex thread of 44 dte
and the rear guide rod (rod 3 in Table 1). In Examples 1 and 2, the fabric was Spande Soks A in bar 2.
and Bar 3 were made using two different elastic yarns called Spandex B. Both comparative samples were made without the use of two dissimilar spandex yarns. The load force at 200% elongation of spandex A is 0.020
0 decinewton/tex (203mti/dt
ex) and the loading force at 200% elongation of spandex B is 0.0093 decinewtons/tex (98
mg/dtex), and the difference was 107%. Each fabric weighs approximately 170 grams per square meter (5 ounces per square yard) and has a 15.2 c trap (6 inch) quality (q
utility) and a front runner length (in use) of 8 inches.

Table 1 - Examples 1 and 2 Rod 1: Fully threaded, 44-dtex nylon;
1-0.2-3 stitch bar 2; 44-dtex spandex, see below, 1-2.1-0 stitch bar 3:
44-dtex spandex, see below, 1-2.
1-0 stitches (bar 3 is empty, excluding samples e and f) Bar 2 Rod-μs- Span sample Dex A A B A A B A B Threading 10 in, 10 out 10 in, 10 out 10 in , 10 out 1 in, 1 out 1 in, 1 out 1 in, 1 out complete threading 10 out, 10 in 10 out, 10 in 10 out, 10 in 1 out, 1 in 1 out, 1 in 1 out, Each of the unbleached (greige) fabrics produced by the 1 in empty, unused empty, unused 5 knitting machines were smooth. Each unbleached fabric was finished according to the conventional finishing procedures described below. Each fabric was first exposed to a relaxation steam heat treatment and then heat set on a pin width ratio machine whose hottest part was held at 190°C (375°F). The heat-set fabric is then refined, dyed as directed, and heated to 160°C (300°
F) was dried on a pin width ratio machine.

After finishing, the fabrics of Examples 1 and 2 exhibited a repeating pattern of knitted fabric corresponding to the repeating adjacent areas created by the feeding pattern of Spandex Yarns A and B. 2 and 3 show the striped pattern produced on the front and back sides of the fabric of Example 1. Spandex threads with high loading forces form tight stitches and therefore for the same number of ridges,
A narrow area was created.

The knitted fabric was not distinct in any of the comparative fabrics from a to f. Comparative fabrics showed that the repeating striped pattern of the fabric of the present invention was due to the use of two elastic yarns with different elastic properties in different areas of the fabric. Comparative samples also showed that such knitted patterns cannot be created in warp-knit stretch fabrics if only one type of elastic yarn is used in the texture of the fabric. However, in theory, if one of the elastic yarns is replaced by a second, inelastic yarn, a knitted fabric effect can be achieved, but of course such fabrics are not stretchable in areas that do not contain spandex yarns, and therefore are not stretchable. It is inferior.

The main features and aspects of the invention are as follows.

1. having areas of repeating adjacent ridges, the ridges of a first said adjacent area being formed by stitches of a set of inelastic yarns interwoven with a first set of elastic yarns; The ridges in adjacent areas are formed by inelastic yarns interwoven with the elastic yarns of the second set, and the elastic yarns in the adjacent areas are sufficiently different in elastic properties to form loops of stitches in the second area. A warp-knitted elastic fabric forming loops of stitches in a first area that differ in tightness, so that a visible banding pattern is distinct in the knitted fabric.

2. The fabric according to 1 above, wherein each adjacent area comprises an equal number of ridges.

3. The fabric of 1 above, wherein each adjacent area comprises an unequal number of ridges.

4. The fabric according to item 1 above, wherein the elastic thread is a nylon thread forming a continuous 1-2.1-0 stitch and the inelastic thread is a nylon thread forming a continuous 1-0.23 stitch.

5. The elastic threads of the ridges in the first and second adjacent areas are 20
4. Fabrics according to 1.2.3 or 4 above, which differ from each other in terms of load force by at least 50% at 0% elongation.

6. The elastic threads of the ridges in the first and second adjacent areas are 20
6. Fabrics according to 5 above, which differ from each other in terms of load force by at least 80% at 0% elongation.

7. Two sets of elastic yarns with different elastic properties (both with the same elongation rate, each fed in the form of a strip to the same or different guide rods, and - a set of inelastic yarns fed to different guide rods,
The elastic threads and the inelastic threads are knitted together such that one area includes ridges formed by the first elastic thread and an adjacent area includes ridges formed by the second elastic thread. A method for producing a warp-knitted elastic fabric according to item 1 above using a warp-knitting machine, which forms ridges in adjacent areas.

8. Spandex yarn in which the elastic thread is formed as a repeated 1-2.1-0 stitch, and the inelastic thread is a nylon thread formed as a repeated 1-0.2-3 stitch. 7. The method according to 7 above.

9. The nylon thread is fully threaded on the first guide bar, the spandex thread is threaded on the second guide bar with 10 in and 10 out, and the other spandex thread is threaded on the second guide bar with 10 in and 10 out.
The method according to item 8 above, wherein the thread is threaded onto the third guide rod at 0 out and 10 in.

10. The nylon thread is fully threaded onto the first guide rod,
8 above, wherein the spandex yarn is threaded onto the second guide bar at 1 in and 1 out, and the other spandex thread is threaded onto the third guide bar at 1 out and 1 in. Method.

[Brief explanation of drawings]

In the accompanying drawings, Figure 1 is a conventional warp knitting stitch diagram showing the stitch pattern used in the above examples to make the sample fabric of the present invention as well as the comparative fabric; Figures 2 and 3 are respectively FIG. 4 is an enlarged photograph (approximately 3° 3×) of the front and back sides of the fabric produced according to Example 1 above, and FIG. FIG. 2 is an enlarged view of the photograph of FIG. 2 showing the difference in tightness between the stitch loops of the kerosene. Engraving of drawings (Contents 6 F I G. (・ri; -( : No change) Front guide stick B Nylon 1-0.2-3 Procedural amendment (method) % formula % 1, Incident display Heisei 2 Patent Application No. 312964 2, Name of the Invention, Striped Warp-knitted Stretch Fabric 3, Relationship with the Amendment Person Case

Claims (1)

[Claims] 1. Having areas of repeating adjacent ridges, the ridges in the first adjacent area are formed by a stitch of a set of inelastic yarns interwoven with a first set of elastic yarns. and the ridges of the second adjacent region are formed by inelastic yarns interwoven with a second set of elastic yarns, and the elastic yarns of the adjacent regions are sufficiently different in elastic properties that the ridges of the second adjacent region are Warp-knitted stretch fabric, forming loops of stitches in a first area that differ in tightness from loops of stitches in areas of , so that a visible banding pattern is distinct in the knitted fabric. 2. At least two sets of elastic yarns with different elastic properties are each fed in the form of a strip to the same or different guide rods at the same elongation rate, and one set of inelastic yarns is fed to another guide rod,
The elastic yarns and the inelastic yarns are knitted together such that one area includes ridges formed by the first elastic yarn and an adjacent area includes ridges formed by the second elastic yarn. A method for producing a warp-knitted stretch fabric according to claim 1 by means of a warp-knitting machine, forming ribs in adjacent areas.