JP3062584U - Stretch woven and knitted fabric - Google Patents

Abstract

(57) [Problem] To provide a stretchable woven / knitted fabric excellent in retention of beams, waist and pleats, exhibiting good stretch elasticity recovery performance, and also excellent in weaving properties. SOLUTION: The woven or knitted fabric mainly composed of a composite spun yarn containing stretchable long fibers in an eccentric state in an arbitrary cross section, and the woven or knitted fabric has an elongation elastic recovery of 40% or more.

Description

[Detailed description of the invention]

[0001]

[Technical field to which the invention belongs]

 The present invention relates to a stretchable woven or knitted fabric exhibiting a good stretch elastic recovery rate, and more particularly to a stretchable woven or knitted fabric mainly composed of a composite spun yarn containing stretchable long fibers in an eccentric state. It is.

[0002]

[Prior art]

 It is well known that a composite yarn of a stretchable long fiber and a spun yarn is used as a yarn constituting a fabric to simultaneously impart a spun yarn-like feeling and stretchability to the fabric. For example, a twisted yarn of a stretchable long fiber and a spun yarn is a typical example.

[0003] However, the above-mentioned twisted yarn does not sufficiently exhibit the stretchability of the stretchable long fiber due to its structure, and therefore, the fabric composed of the twisted yarn is inferior in stretchability and stretchability. It has the disadvantage that spots in appearance occur due to the difference in dyeing between the long fiber and the spun yarn.

In order to improve such disadvantages, it is also known to use a so-called core spun yarn obtained by mixing a stretched long fiber with a running sliver in an elongated state and then twisting. ing. The core-spun yarn exhibits good stretchability, and since stretchable long fibers are arranged at the core of the composite yarn, uneven appearance does not occur, while the beam and the waist are weak and the pleated retention is poor. However, there is a disadvantage that the weavability is poor.

[0005]

[Problems to be solved by the invention]

 An object of the present invention is to solve the above-mentioned problems of the prior art and to provide a stretchable woven fabric which is excellent in beam, waist and pleat retention properties, exhibits good elongation elasticity recovery performance, and is excellent in weavability. It is in.

[0006]

Means for Solving the Problems The inventors of the present invention have conducted intensive studies to achieve the above object, and as a result, after eccentric mixing of a stretchable long fiber in a running sliver in a stretched state, It was determined that the desired woven or knitted fabric was obtained when the elastic recovery was performed in the woven or knitted fabric.

[0007] Thus, according to the present invention, a woven or knitted fabric mainly composed of a composite spun yarn containing an elastic long fiber in an eccentric state in an arbitrary cross section thereof, and the woven or knitted fabric has a recovery in elongation elasticity. A stretchable woven or knitted fabric having a ratio of 40% or more is provided.

[0008]

[Embodiment of the invention]

 The stretchable long fibers used in the present invention are long fibers having an elongation of at least 400% or more, such as polyurethane (spandex) yarn. Further, any fiber such as natural fiber, synthetic fiber or regenerated fiber can be used as the fiber constituting the spun yarn to be mixed with the stretchable long fiber. A preferred example is polyester fiber.

[0009] In order to obtain the woven or knitted fabric of the present invention, first, in the manufacturing process of the spun yarn, eccentric mixing is performed in a state where the stretchable long fiber is stretched on the running sliver, and then twisted to form a multi-strand. Obtain a spun yarn.

In this case, the stretch rate of the stretchable long fiber is preferably 100 to 300%. As a method of eccentric mixing, an elastic long fiber is superimposed on one of two rovings before the front roller in the spinning process, and the two rovings are mixed by the front roller. A method of feeding and twisting is exemplified.

When stretchable long fibers are mixed without eccentricity, stretch elastic recovery performance can be imparted to the woven or knitted fabric, but the pleat retention described below is inferior.

[0012] The proportion of the stretchable long fibers in the obtained composite spun yarn is preferably 5 to 15% by weight. If the ratio is less than 5% by weight, the obtained woven or knitted fabric cannot be provided with sufficient elongation and elasticity recovery performance, while if the ratio exceeds 15% by weight, the stretching of stretchable long fibers (stretchability). (A phenomenon in which the long fibers can be seen through).

Next, the composite spun yarn is knitted and woven into an arbitrary structure such that the cover factor CF becomes 7 to 11. At this time, the cover factor of the warp (in the case of a knitted fabric in the wale direction) is used when the composite spun yarn is used in the warp, and the weft (in the course direction in the case of knitted fabric) when the composite spun yarn is used in the weft. The cover factor should satisfy the above range.

Here, the cover factor CF is a value represented by the following equation.

[0015]

(Equation 2)

In the present invention, the woven or knitted fabric is further heat-shrinked at a temperature of 60 to 180 ° C., preferably 150 to 180 ° C. Due to this heat shrinkage, the stretchable long fiber mixed with the composite spun yarn in the stretched state is elastically recovered, and the woven or knitted fabric is given a good stretched elastic recovery performance.

The above-mentioned heat shrinkage may be carried out in either dry heat or wet heat state, and a conventionally known heating means such as a pin tenter can be arbitrarily adopted.

When the temperature of the heat shrinkage is lower than 60 ° C., the woven or knitted fabric may not be sufficiently shrunk, and the obtained woven or knitted fabric may have a reduced elongation elasticity recovery performance. If the temperature exceeds ℃, the texture of the obtained woven or knitted product may be hardened due to excessive shrinkage of the woven or knitted product, or the physical properties of the woven or knitted product may be reduced.

At the time of the above heat shrinkage, the change rate ΔCF of the cover factor defined by the following equation is preferably 10 to 60%.

[0020]

(Equation 3)

When the rate of change ΔCF is less than 10%, the woven or knitted fabric does not shrink sufficiently, and the elongation / elasticity recovery performance of the obtained woven or knitted fabric may be reduced. On the other hand, when the rate of change ΔCF is less than 60%. If it exceeds, the woven or knitted fabric may shrink too much and the texture of the obtained woven or knitted fabric may be hardened.

It is necessary that the woven or knitted fabric thus obtained has an elongation and elastic recovery of 40% or more. If the elongation elastic recovery is less than 40%, good stretch elastic recovery cannot be imparted to the woven or knitted fabric.

Further, it is preferable that the pleat retention of the obtained woven or knitted fabric is 60% or more. When the pleat retention is less than 60%, the pleat retention may be poor.

[0024]

【Example】

 Hereinafter, the present invention will be described in more detail with reference to examples. The physical properties used in the examples were measured by the following methods.

(1) Elongation Elasticity Recovery Rate A test piece of 5 cm × 30 cm was sampled from the woven or knitted fabric, and the test piece was gripped with a tensile tester equipped with a self-recording device so that the grip interval was 20 cm. After extending 1% of the original length in min, return to the original position at the same speed. This is sequentially performed with 3, 5% of the original length to draw a load-elongation curve, and the recovery rate at the time of elongation is calculated from the residual elongation L 'at the time of returning to the original position after elongation by 5% according to the following equation. The measurement was performed three times, and the average value was shown.

[0026]

(Equation 4)

(2) Pleated Retention The pleated retention of the woven or knitted fabric was measured in accordance with JIS 1060.

(3) Appearance of Woven and Knitted Fabrics Five skilled workers sensory-determine the peeling of the stretchable long fibers and the unevenness of the appearance caused by the difference in dyeing between the long fibers and the spun yarn. ), （(Good), Δ (slightly poor), and × (bad).

(4) Hand feeling of the woven or knitted fabric The sensory judgment of the beam, waist and surface touch of the woven or knitted fabric was carried out by five skilled persons, and （(very good), （(good), Δ (somewhat bad) and × (poor) ) In four steps.

(5) Workability The workability when a plain fabric of 150 cm width was manufactured continuously for 50 m (operating time: about 30 hours) was evaluated as ◎ (no stop), ○ (slight stop) ), △ (with stop) and × (frequent stop) were evaluated.

Example 1 A mixture of 50% by weight of polyethylene terephthalate short fibers having a denier of 2.5 denier and a fiber length of 64 to 89 mm and 50% by weight of wool was weighed 0.35 g / m. Were supplied to a roving supply section of a ring spinning machine, drafted at a draft ratio of 25 times, and then supplied to a front roller for spinning.

[0032] A separately prepared polyurethane filament having a total fineness of 20 denier is superimposed on one of the two roving yarns supplied to the front roller in a state where it is stretched by 300%. The yarn was fed by a front roller and twisted with a twist number of S 740 t / m to obtain a 32nd-number composite spun yarn. The composite spun yarn contained an elastic long fiber 1 in an eccentric state in an arbitrary cross section as shown in FIG.

Next, using the composite spun yarn as a warp and a weft, a flat yarn having a warp density of 50 yarns / inch (cover factor is 8.8) and a weft yarn density of 48 yarns / inch (cover factor is 8.5) is used. The fabric was woven.

After scouring and dyeing the obtained woven fabric by a conventional method, it is heat shrunk at 165 ° C. for 5 minutes using a pin tenter, and has a warp density of 66 yarns / inch (cover factor of 11.7) and a weft yarn density of 60 yarns / hour. An inch (cover factor of 10.6) plain fabric was obtained. The cover factor change rate ΔCF of the obtained woven fabric was 33% for the warp and 25% for the weft. Table 1 shows the physical properties of the obtained woven fabric.

Comparative Example 1 The procedure of Example 1 was repeated, except that one roving having a weight of 0.70 g / m was used and the polyurethane filament was superimposed on one roving supplied to the front roller. The operation was performed in the same manner as in Example 1.

The obtained composite spun yarn has a stretchable long fiber 1 arranged at the center in an arbitrary cross-section as shown in FIG. 2, and the obtained plain woven fabric has a warp density of 60 yarns. / Inch (cover factor was 10.6), weft density was 52 yarns / inch (cover factor was 9.2), and the cover factor change rate ΔCF was 20% for warp and 8% for weft. Table 1 shows the physical properties of the obtained woven fabric.

[Comparative Example 2] [0038] A 64th yarn obtained by blending 50% by weight of polyethylene terephthalate short fibers having a denier of a single fiber of 2.5 and a fiber length of 64 to 89mm with 50% by weight of wool by a conventional method. Was spun at a twist rate of S 560 t / m to obtain a cross-twisted yarn.

Next, a plain woven fabric having a warp density of 50 yarns / inch (cover factor: 8.8) and a weft yarn density of 48 yarns / inch (cover factor: 8.5) is used for the warp and weft yarns. Weaved.

After the obtained woven fabric is scoured and dyed by a conventional method, it is heat shrunk at 165 ° C. for 5 minutes using a pin tenter, and has a warp density of 54 yarns / inch (cover factor is 9.5) and a weft density of 52 yarns / An inch (9.2 cover factor) plain weave was obtained. The change factor of the cover factor ΔCF of the obtained woven fabric was 8% for the warp and 8% for the weft. Table 1 shows the physical properties of the obtained woven fabric.

[0040]

[Table 1]

[0041]

[Effect of the invention]

 ADVANTAGE OF THE INVENTION According to this invention, the stretchable woven or knitted fabric which is excellent in holding the beam, the waist and the pleats, and exhibits a good elongation elastic recovery performance can be easily obtained.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a composite spun yarn of the present invention.

FIG. 2 is a cross-sectional view of a conventional composite spun yarn.

[Explanation of symbols]

 1 Elastic long fiber 2 Composite spun yarn

Claims (5)

[Utility model registration claims] 1. A woven or knitted fabric mainly comprising a composite spun yarn containing stretchable long fibers in an eccentric state in an arbitrary cross-section, wherein the woven or knitted fabric has an elongation elastic recovery of 40% or more. A stretchable woven or knitted fabric, characterized in that: 2. The stretchable woven or knitted fabric according to claim 1, wherein the stretchable long fibers are polyurethane. 3. The stretchable woven or knitted fabric according to claim 1, wherein the pleated retention of the woven or knitted fabric is 60% or more. 4. The stretchable woven or knitted fabric according to claim 1, wherein the woven or knitted fabric is a woven or knitted fabric that has been heat shrunk at 60 to 180 ° C. 5. The stretchable woven or knitted fabric according to claim 4, wherein a change rate ΔCF of the cover factor before and after heat shrinkage defined by the following formula is 10 to 60%. (Equation 1)