JPS6278208A - Cuprammonium rayon multifilament - Google Patents

Abstract

PURPOSE:To obtain high-quality woven fabric with a small amount of air used, by making length of single yarn looseness of cuprammonium rayon multifilament useful as weft of air jetting type weaving machine in a specific range. CONSTITUTION:In carrying out weaving using cuprammonium rayon multifilament as weft by an air jetting type weaving machine, length of single yarn looseness of the multifilament is made in 10-50mm (preferably 20-40mm). The cuprammonium rayon multifilament can be obtained by adjusting pickup of a finishing oil on undrawn yarn to <=2.1wt%, preferably 0.5-1.8wt% or making fineness of constituent single yarn of multifilament <=1.5 denier, preferably <=0.3-1.5 denier.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field] The present invention relates to a weft multifilament yarn used in air-jet looms. More specifically, the present invention relates to a cuproammonium multifilament for weft yarns, which requires less air during weft insertion, has fewer fabric defects, and is necessary to obtain fabrics with good texture.

[Conventional technology]

Conventionally, cuprammonium rayon multifilament used in air-jet looms has been bundled by twisting, false twisting, gluing, etc., and used as weft yarns. The reason why these weft yarns have been used in a bundle is that in air injection looms with air guides, when the weft yarns are conveyed by the jet of air, the weft yarns come into contact with the inner surface of the air guide, or weft yarns with special shapes are used. In air-injection looms that have a weft and auxiliary nozzle, this is to prevent the weft from coming into contact with this specially shaped flow, which can cause the multifilament weft to come loose or become disordered, which can lead to serious textile defects. there were. For this reason, conventionally, multifilaments have been used that do not easily come apart even when the multifilaments come into contact with the above-mentioned air guide elements, reeds, etc. for example,
BACKGROUND ART Conventionally, bundled yarns having strong binding properties such as twisted yarns or cycloset yarns, or strong bundled yarns in which single yarns are continuously joined with glue or the like, even if they are non-twisted yarns, have been used.

[Problem that the invention seeks to solve]

As described above, the conventionally used bundled yarns require a large amount of air to be blown to convey the weft, and the fabrics woven using such bundled yarns as wefts have a hard texture. It had the following drawbacks.

Therefore, an object of the present invention is to reduce weaving costs by minimizing the amount of air required for conveying weft yarns, without causing serious fabric defects caused by looseness or disturbance of weft yarns, and to provide soft and textured fabrics. The goal is to obtain a good quality fabric.

[Means to solve the problem]

The present invention is a cuproammonium rayon multifilament for the weft of an air-jet loom, and the cuproammonium rayon multifilament is characterized in that the single yarn loose length (L) is within the range of 10 mm to 50 m. Provide filament.

The inventors of the present application have fundamentally analyzed the mechanism of weft fuzz generation and weft knot generation, and as a result of carefully linking it to various characteristics of weft yarns, we have found that it is completely impossible to predict from conventional preconceptions. I found out that there is no such thing.

In other words, the convergence of the weft yarns and the above-mentioned defects are extremely closely related, but contrary to the conventional method, if the convergence is extremely reduced,
This ideal air jet not only eliminates the above disadvantages, but also greatly reduces the amount of air required to transport the weft, and also makes the texture of fabrics woven with such weft soft! It was discovered that a weft for tIi machines could be obtained.

The present invention will be specifically explained below.

The cuproammonium rayon multifilament of the present invention has a single yarn loose length (L) of 50 to 10 mm.
mm, preferably L=20m~
40m- is desirable. The single yarn loose length (L) of the conventional cupro ammonium rayon multifilament with convergence is L≦7. Generally, cupro ammonium rayon multifilament having a single yarn loose length (L) in the range of L<10 mm. When rayon multifilament is used for the weft,
Since the weft conveyance force is extremely reduced, it becomes necessary to increase the jetting pressure, and therefore the amount of air required for weft conveyance also increases, and the texture of the resulting fabric becomes stiff.

On the other hand, in the range where the single yarn loose length (L) is L > 50 mm, there is no appropriate injection pressure range for weft conveyance, and even if the injection air pressure is low, weft knots, weft fuzz, etc. Significant textile defects occur. The above-mentioned single yarn loose length (L
) can be adjusted by the amount of oil applied or the fineness and number of constituent single filaments. In the case of cuproammonium rayon, the smaller the amount of the raw oil adhered to the fiber or the smaller the fineness of the constituent single fibers, the larger the single fiber loose length (L) becomes.

More specifically, the single yarn loose length (L) of the present invention is L=1
(In order to obtain a cuprammonium rayon multifilament within the range of bm to 50 m1, the amount of the above-mentioned raw thread oil applied should be 2.1% by weight or less, preferably 0.5% by weight or less.
~1.8% by weight, or by constructing the multifilament with single fibers having a fineness of 1.5 denier or less, preferably 0.3 to 1.5 denier. be able to. In addition, the total fineness of the multifilament is not particularly limited, but is usually 20 to 50.
0 denier is used.

In addition, the single yarn loose length (L) is shown in Figure 1 ta+ and (
It is measured by the method shown in b). That is, 50 cuprammonium rayon multifilament 1
Take the sample length = 1) cm long, fix the upper end,
A load 2 of 10 g is suspended from the bottom end.

A portion 3 having a length of 40c+n (2 mm from the upper end) is cut from the upper end of this multifilament 1 using scissors 4. The length (L) of the portion where the single yarn is loose at the lower end of the upper part of the cut multifilament 1 is expressed in units of n as the single yarn loose length (L). In addition, measurements were performed for n=20 pieces, and the average value is shown.

Next, a method for manufacturing the cuproammonium rayon multifilament of the present invention will be explained. The cuproammonium rayon spinning method may be any known method.
The composition of the stock solution, spinning conditions, etc. can be those commonly used.

In the case of the present invention, the single yarn fineness is 1.5 denier or less, preferably 0.3 to 1.5 denier, more preferably 0.8 to 1.5 denier.
Spin as 1.4 denier.

The spun multifilament is continuously scoured and dried, and an oil agent is applied to improve cohesiveness and sliding properties.
Usually, an oil agent mainly composed of mineral oil, fatty acid ester, nonionic surfactant, etc. is applied. Conventionally, with oil @
The amount was 2.4% by weight or more, but in the case of the present invention, the amount of oil adhered was 2.1% by weight or less, preferably 0.5% by weight or more.
It is set as 1.8%.

After applying the oil, it is rolled up into cheese or corn without twisting. The tension applied to the yarn during winding is on average 0.1 g/d to 0.1 g/d.
The best focusing property can be obtained at 4 g/d.

Hereinafter, the present invention will be specifically described with reference to Examples.

Example 1 Ordinary cupra ammonium stock solution (cellulose concentration 10
Weight%, copper 3.6% by weight, NHs 7.6% by weight, viscosity 1
36 seconds/20° C.) from a nozzle having 54 orifices with a hole diameter of 0.6 wφ to spin a 75 denier multifilament.

This multifilament is continuously coagulated, regenerated, refined,
After drying, 2.1% by weight of an oil agent mainly composed of mineral oil and fatty acid ester was applied, and the product was rolled up in the form of cheese at a tension of 0.25 g/denier without twisting, making it virtually untwisted. Cupraammonium rayon multifilament was obtained. Using this yarn, the single yarn loose length (L), which is an evaluation of the cohesiveness of the multifilament, was measured using the method described above.

Using this thread, 584 rp was produced using an air jet loom (S, D, P type, ZA-100 type) made by Tsudakoma Seisakusho.
It was operated at a rotational speed of m, and the weavability, fabric quality, and hand were evaluated.

The weaving conditions were as follows.

(1) Warp thread: cupra ammonium rayon 75
'/45 filament (2) warp density: 47.6 threads/cImm (3) weft yarn: Cupra ammonium rayon multifilament (4) of this example Weft density = 33.1 threads/cII Note that in this example The evaluation method used is as follows.

(Amount of oil attached to the yarn) The amount of oil consumed during yarn production is divided by the amount of yarn produced and expressed as a percentage: (Yarn oil consumption/yarn amount) x 100 (%)
) (Used air amount) Float type air amount measuring device based on JIS standards (measuring range 8~
501b+''/hour).

(Weft stoppage rate) Weaving using three looms for 24 hours x 10 days, and the number of weft stoppages due to weft stoppages, tangled ends, insufficient output, etc., calculated per machine per day.

(I inspected a 1000m li machine that woven weft and weft dots, and the length of weft and dots was lc.
Count the defects of A+ or higher and convert them per 1m.

(Textile texture) The texture of the fabric that has been kneaded and finished is sensory tested by touch, and the results are as follows: 1st grade: soft, 2nd grade: slightly soft, 3rd grade: average, 4
Based on the 5-level evaluation criteria: grade = moderately hard, grade 5 = hard.
It was ranked by five people and expressed as the average value.

The results of the evaluation are shown in Table 1.

Example 2 A multifilament was produced and evaluated in exactly the same manner as in Example 1, except that the amount of oil applied was 2.0% by weight.

The results of the evaluation are shown in Table 1.

Example 3 Same as Example 1 except that the amount of oil applied was 1.6% by weight.
Multifilaments were manufactured in the same manner and evaluated.

The results of the evaluation are shown in Table 1.

Example 4 A multifilament was produced and evaluated in the same manner as in Example 1, except that the amount of oil applied was 0.8% by weight.

The results of the evaluation are shown in Table 1.

Example 5 A multifilament was produced and evaluated in exactly the same manner as in Example 1, except that the amount of oil applied was 0.3% by weight.

The results of the evaluation are shown in Table 1.

Comparative Example 1 A 75-denier multifilament was spun using a nozzle having 45 orifices with a hole diameter of 0.6 wφ, and the multifilament was produced in the same manner as in Example 1, except that the amount of oil applied was 2.4% by weight. Filaments were manufactured and evaluated.

The results of the evaluation are shown in Table 1.

Comparative Example 2 A multifilament was produced and evaluated in exactly the same manner as in Example 1, except that the amount of oil applied was 2.8% by weight.

The results of the evaluation are shown in Table 1.

Comparative Example 3 A multifilament was produced and evaluated in exactly the same manner as in Example 1, except that spinning was performed without applying an oil agent.

The results of the evaluation are shown in Table 1.

The following margin [Effects of the Invention] The woven fabric obtained by the present invention does not have any serious defects in weft yarns, and the amount of air required for conveying the weft yarns is 1
The texture of the resulting fabric is reduced by 72 to 1/3.
A texture that is about two ranks softer than the conventional one can be obtained.

[Brief explanation of drawings]

FIGS. 1(a) and 1(b) are explanatory diagrams of a method for measuring the single yarn loose length (L). 1: Cupra ammonium rayon multifilament, 2: Load, 3: Length 40
The lower end position of the filament in cm. 1st country

Claims (1)

[Claims] Cupra ammonium rayon multifilament for weft of air injection loom, single yarn loose length (L)
Cuproammonium rayon multifilament, characterized in that L is in the range of 10 mm to 50 mm.