JPH0623589Y2 - Elastic tricot warp knit - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a stretchable warp knitted fabric suitable for foundations such as brassieres and girdles, inners such as shorts, and swimwear.

(Prior Art) A warp knitted fabric in which nylon fiber yarns and elastic fiber yarns have been knitted as a foundation, an inner, and a cloth for wearing water conventionally.
Alternatively, a warp knitted fabric in which these yarns and hygroscopic fiber yarns are interwoven is known.

Recently, as one direction for high-grade products, studies are underway to make the fabric thinner and to knit cotton with a natural fiber orientation. However, if the polyamide fiber yarn, which is the main material, is thinly denier for thinning, the tear strength and burst strength of the fabric will be reduced, and commercial products will not be obtained, and the application will be limited. Therefore, when fine denier is made using high-strength polyamide fiber yarn, although the strength of the fabric can be maintained, the high-strength polyamide is obtained by spinning using a normal resin and increasing the draw ratio, so that the yarn strength is high. However, the elongation was lowered, the elongation rate of the fabric was lowered, and further the yarn breakage occurred during knitting, and it was hard to say that the fabric was excellent in quality. Further, it is possible to thin the elastic fiber yarn for thinning the fabric, but if it is simply thinned, the stretching force of the fabric is greatly reduced, and the fitting property and the tension force are poor, so that it is not practical. Fabrics made by knitting cotton threads are mainly used for foundation fabrics, but the demand for thinner fabrics is stronger than for swimwear. However, the addition of cotton threads makes it even more difficult to thin the fabric. Although it is conceivable to make the cotton thread thin, the warp knitting of the elastic yarn interlaced knitting has a strength limit of about 80 s / 1 for the cotton count. Even with this, there are many thread cuttings during knitting and the quality is good. It is difficult to obtain a stable fabric.
At present, in the case of a single yarn of cotton yarn, nylon of fine denier (10 to 20 denier) is often covered and reinforced to cover the cotton yarn. Also, recently, twin yarn maker (60s / 2 ~ 140s
/ 2), and the current situation is to make a stable fabric with a thick fabric but little thread cutting. Therefore, the use of fine count cotton threads is limited in terms of quality and operation.

For the above reasons, at present, thin stretchable fabrics for swimwear, innerwear, and foundations using polyamide fiber yarn of 30 denier or less are suitable for practical use in both strength and stretchability, and good quality has not been obtained. is there.

(Problems to be solved by the invention) Although the present invention is thin, it has practically satisfactory tear strength and burst strength, and is sufficiently stretchable, making it suitable for foundation, innerwear and swimwear applications. The purpose is to provide a warp knitted fabric.

(Means for Solving the Problem) A stretchable tricot warp knitted fabric, which is formed by knitting at least the following A yarn and B yarn.

Yarn A: Single yarn 1 to 5 denier, total 10 to 30 denier, relative viscosity (RV) 2.5 to 4.0, breaking strength (DT) 7.0
Polyamide-based synthetic fiber multifilament yarn having a breaking elongation of 30% or more up to 10.0 g / d.

B yarn: A rubber-like elastic fiber yarn having a single yarn of 3 to 15 denier, a total of 20 to 280 denier, and a breaking elongation of 350% or more.

The relative viscosity (RV) intended in the present invention is 2.5 to 4.0,
The polyamide-based synthetic fiber multifilament yarn having a breaking strength (DT) of 7.0 to 10.0 g / d is obtained by melt spinning a polyamide having a relative viscosity of 2.5 to 4.0 and then stretching. Of course, it can also be obtained by the direct spinning and drawing method. When this is spun by increasing the relative viscosity, the post-expansion rate is large at the conventional spinning speed, making it impossible to wind the film.
1000 m / min is preferable, and more preferably 300-
500 m / min. In this case, the orientation of the undrawn yarn proceeds. The unstretched yarn is cold-stretched or hot-stretched at a draw ratio of 2.0 to 4.5, and the breaking strength (DT) is increased by raising the temperature of the heating cylinder under the spinning nozzle or lowering the temperature of the cooling air. It is possible to obtain a high-strength polyamide fiber having a very high strength of 7.0 to 10.0 g / d. The thickness of the multifilament yarn of polyamide fiber must be 1 to 5 denier per single yarn denier, and the total denier is 10 to 10.
It should be 30 denier. Single yarn denier
When it exceeds 5.0 denier, the number of filaments decreases, and the texture of the obtained knitted fabric becomes hard, which is not good. If it is less than 1 denier, the knitted fabric becomes too soft and knitting becomes difficult. Preferred is 2-4 denier. By using such a high-strength polyamide fiber, sufficient strength can be obtained even if the thickness of the yarn is reduced. For example, even if the yarn thickness is 20 denier, the breaking strength and tear strength are 40% of those of the conventional polyamide multifilament yarn.
A value equivalent to denier is obtained. Further, the breaking elongation (dry elongation) of the high-strength polyamide fiber is 30% or more, the elongation of the obtained knitted fabric is high, and the yarn breakage during knitting does not occur. If it is less than 30%, the elongation rate of the knitted fabric will be poor, it will be unsuitable for foundations, swimwear, etc., thread breakage will occur during knitting, and productivity will also be poor. Polyamide that constitutes the polyamide-based synthetic fiber multifilament yarn is, for example, polycaprolactam (nylon 6), polyhexamethyleneadipamide (nylon 66), polyhexamethylenesepacamide (nylon 610), polytetramethyleneadipamide. (Nylon 46), copolymers of these polyamides and 1,4
-Polyamides containing the condensation product of cyclohexanebis (methylamine) and linear aliphatic dicarboxylic acid. A matting agent, a pigment, a light stabilizer, a heat stabilizer, an antioxidant, an antistatic agent, a dyeability improver or an adhesion improver can be added to such a polyamide, if necessary. The polyamide-based synthetic fiber may be used as a filament yarn, or may be used as a textured yarn by performing false twisting processing under normal false twisting conditions.

As the rubber-like elastic fiber yarn, natural rubber, synthetic rubber or polyurethane synthetic fiber yarn, butadiene rubber fiber yarn,
Polyester-based elastic fiber threads are included, but polyurethane-based synthetic fiber threads are preferable. Examples of polyurethane-based synthetic fiber yarns include polyurethane elastomers obtained by reacting a polymer diol such as polyester diol, polyether diol, and polycarbonate diol with a polyisocyanate, a low molecular chain extender, and optionally a terminal terminating agent. Further, either Kabarinfu yarn or bare yarn may be used, but bare yarn is preferred.
In addition, even if the rubber-like elastic fiber yarn has the same total denier, if the thickness of the single yarn denier that constitutes it is reduced,
Although the elongation of the raw yarn itself is lowered, the stress at the time of elongation is increased, and therefore it is preferable to increase the stress. However, the total denier is 2 when the operability at the time of manufacturing the elastic yarn is added.
It is necessary that the filament is 0 to 280 denier, the single yarn denier is 3 to 15 denier, and the breaking elongation is 350% or more. When the total denier is less than 20 denier, the stretchable force of the obtained fabric is too small to be practical, and when the total denier exceeds 280 denier, the thinning which is the main purpose of the present invention is hindered. Further, if the breaking elongation is less than 350%, the stretchability of the obtained fabric is reduced, which is not practical. Preferred breaking elongation is 350-500%
Is.

In the present invention, the relative viscosity and the breaking strength are values measured by the following methods.

Polymer concentration is 1 in concentrated reagent grade sulfuric acid with relative viscosity 96.3 ± 0.1% by weight.
The sample solution is prepared by dissolving the sample to 0 mg / ml, and the relative viscosity of the solution is measured at a temperature of 20 ° C. ± 0.05 ° C. using an Ostwald viscometer with a water drop time of 6 to 7 seconds.
In the measurement, using the same viscometer, the relative viscosity RV is calculated from the ratio of the drop time T ₀ (second) of 20 ml of sulfuric acid and the drop time T ₁ (second) of 20 ml of the sample solution, which are the same as when the sample solution was adjusted. It calculates using the formula of.

RV = T ₁ / T ₀ Break strength Measured with Tensilon manufactured by Toyo Baldwin in the state of one original yarn. (G / d) A polyamide-based synthetic fiber multifilament yarn and a rubber-like elastic yarn as described above are arranged on a reed to knit a tricot warp knitted fabric, but a hygroscopic fiber yarn is added to the warp knitted fabric if necessary. May be As the hygroscopic fiber yarn, spun yarn made of natural fibers such as cotton, wool and hemp, or rayon,
Spun yarns such as cupra and acetate are preferred. Also,
The use of twin yarn is preferred because of its quality and operability. As the tricot type knitting structure, a knitting structure which has been conventionally used can be used, but a double denby type or a half cord type is preferable. In addition, in applications such as foundations and shorts, a structure in which a hygroscopic fiber yarn such as cotton yarn is inserted into the above-mentioned ground structure is desirable if necessary. Further, the total denier of the rubber-like elastic yarn is preferably 20 to 70 denier. Conventional methods can be used as they are for knitting conditions, dyeing processing conditions, and the like.

(Example) Hereinafter, the present invention will be described with reference to examples, but the present invention is not limited thereto.

Example, Comparative Example 1 and Comparative Example 2 A knitted fabric was knitted according to the knitting conditions and the yarns shown in Table 1, and the obtained raw fabric was dyed and finished. The processing steps are as follows.

Relaxation → dehydration → presetting → scouring bleaching → hot water washing → dyeing → hot water washing → finishing set The properties of the obtained knitted fabric were as shown in Table 2.

As is clear from Table 2, the embodiment of the present invention has a burst strength which is considered to be practically acceptable, though the thickness thereof is thin, and therefore, the use of the knitted fabric may be restricted. Absent. The expansion rate is also high.

The physical properties in the examples were measured as follows.

1. Bursting strength: JIS L-1018A method Complies with (Mullaren method).

2. Thickness: Use DIAL THICKNESS GAUGE.

3. Elongation force, elongation rate-Instron type tensile tester Descent rate 30 ± 2cm / min-Test piece: 2.5cm x 16.0cm test piece, 2 pieces each in vertical, horizontal and direction are used and extended Force: A test piece is attached to a tensile tester with a tension interval of 10 cm, the machine is operated, and the stress at an elongation rate of 80% is read. The average value of 2 times is shown.

-Extension rate: Attach the test piece and operate the machine in the same way as the extension force measurement, and read the extension rate under a load of 2.25 kg. The average value of 2 times is shown.

(Effect of the Invention) The stretchable warp knitted fabric of the present invention is a thin fabric, and has a high burst strength and a high elongation rate.

[Brief description of drawings]

FIG. 1 is a design diagram of an embodiment of the present invention. A: Nylon fiber yarn B: Spandex yarn C: cotton thread

Claims (1)

[Scope of utility model registration request] 1. A stretchable tricot warp knitted fabric comprising at least the following A yarn and B yarn. Yarn A: Single yarn 1 to 5 denier, total 10 to 30 denier, relative viscosity (RV) 2.5 to 4.0, breaking strength (DT) 7.0
Polyamide-based synthetic fiber multifilament yarn having a breaking elongation of 30% or more up to 10.0 g / d. B yarn: A rubber-like elastic fiber yarn having a single yarn of 3 to 15 denier, a total of 20 to 280 denier, and a breaking elongation of 350% or more.