JP2003267630A - Package of excellent yarn dividing property - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a multi-filament yarn package for yarn division in which twill disturbance or twill unevenness of a single filament can be sufficiently suppressed, and yarn breakage during yarn division can be reduced as much as possible, and a method for manufacturing the package. <P>SOLUTION: When a multi-filament yarn is directly spun and drawn, and wound in a substantially strand-free manner, the multi-filament yarn is drawn, and subjected to the entanglement so that the load tension on a probe in the entanglement method exceeds 0.20 cN/dtex per unit filament size and ≤0.75 cN/dtex. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multifilament yarn package for separating fibers and a method for producing the same, and more specifically, a multifilament having a good separating property wound into a drum shape by a direct spinning and drawing method. The present invention relates to a yarn package and a manufacturing method thereof.

[0002]

2. Description of the Related Art Hitherto, as a multifilament yarn package for separating fibers, a drum-shaped package wound in a substantially non-twisted state without twist in the manufacturing process has been proposed. If the diameter of the constituent monofilament is large, there is a problem that yarn breakage is likely to occur during fiber separation.

The cause of the yarn breakage in the separation from the drum-shaped package is so-called twisting, in which a part of the wound single filament falls off the end face of the drum.
It is believed that the release tension fluctuates at that portion.

It is generally known that in order to reduce such twisting of the single filament, it is generally necessary to lower the winding tension. However, if the winding tension is too low, the winding tension will be increased. The filament is not fixed to the package,
The filament slips down to the center of the package about 1 cm from both end faces of the drum-shaped package, and the filament overlap phenomenon occurs (twilling), which also causes a large fluctuation in the release tension, and the yarn breaks during fiber separation. There was a problem that it was easy.

That is, at both end surfaces of the drum-shaped package, the winding amount becomes larger because the amount of yarn is larger than that at the other portions, and therefore, about 1c from both end surfaces of the package.
A part that is softly wound up occurs in the part that enters the center of the package by about m, and the filaments on both end surfaces slide down to that part.

Therefore, in order to improve the separating property from the drum-shaped package, it is important to suppress the fall of the single filament of the wound package.

For example, in Japanese Patent Laid-Open No. 2001-279521, when a multifilament yarn having a modified cross section is directly spun and drawn, a fluid treatment is carried out at the inlet of a heating roller (that is, before drawing) after oiling, and the entanglement method is used. The load tension applied to the stylus is 0.20 cN per unit fineness
Disclosed is a method for producing a fiber-separation package having a density of / dtex or less.

However, although this method is effective for improving the separation property of multifilament yarns having irregular cross sections, when it is applied to ordinary multifilament yarns such as round cross-sections, the single filaments are not twisted. In addition to being incapable of sufficiently suppressing the twisting and twisting, the undrawn yarn is subjected to a fluid treatment, which causes a problem that uneven drawing may occur during subsequent drawing.

[0009]

SUMMARY OF THE INVENTION The object of the present invention is to solve the above-mentioned problems of the prior art, and to sufficiently prevent twisting and twisting of single filaments, and to break the fibers during fiber separation. It is an object of the present invention to provide a multifilament yarn package for fiber separation in which the number is reduced as much as possible and a method for manufacturing the same.

[0010]

Means for Solving the Problems As a result of intensive studies for achieving the above object, the present inventor has found that when a multifilament yarn is directly spun and drawn, then entangled, and then wound in a substantially non-twisted state. Have found that the desired multifilament yarn package can be obtained.

Thus, according to the present invention, there is provided a package of multifilament yarn wound in a substantially non-twisted state, in which the load tension applied to the stylus in the entanglement method is a unit. Exceeding 0.20 cN / dtex per fineness, 0.75 cN / dt
A multifilament yarn package for separating fibers, which is provided with entanglement such that ex or less, and when the multifilament yarn is directly spun and drawn and wound in a substantially untwisted state, the multifilament Provided is a method for producing a multifilament yarn package for separating fibers, which comprises drawing the yarn and then providing entanglement.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION The multifilament yarn referred to in the present invention means polyethylene terephthalate (PET), polyethylene naphthalate (PEN), polyamide (NY-
6, NY-66), polyethylene (PE), polypropylene (PP), polyphenylene sulphonide (PP)
S), polyether ether ketone (PEEK), para-aramid, and the like, which means a multifilament yarn containing a polymer as a constituent component, and is preferably a multifilament yarn containing polyethylene terephthalate as a main constituent component in terms of cost and durability.

The fineness of the above filaments is not particularly limited, but the effect of the present invention is remarkably exhibited if the fineness of the single filament is 20 to 60 dtex and the number of single filaments is 3 to 12. To do. Further, the effect of the present invention is remarkably exhibited also when each filament constituting the multifilament yarn has a round cross-sectional shape.

The package is a multifilament yarn for separating fibers wound around a paper tube with a substantially constant winding width from the inner layer to the outer layer, and is usually called a drum-shaped or cheese-shaped package. The size of this package is not particularly specified, but the winding width is 1 from the viewpoint of reducing the probability of occurrence of twisting per unit weight.
It is preferably 50 mm or more.

In the present invention, the multifilament yarn has a load tension applied to the stylus of 0.20 cN / dt per unit fineness in the entanglement method.
It is important that confounding is provided so as to exceed ex and be 0.75 cN / dtex or less.

Here, the entanglement method is the strength of the thread-like entanglement due to the load tension applied to the stylus when the stylus for detecting the entanglement of the thread is run at a constant speed while piercing the thread. It has been found that there is a high correlation with the occurrence of twill deviation at the end face of the multifilament yarn package for fiber separation and, consequently, with the fluctuation of the release tension in the fiber separation process.

That is, the load tension applied to the stylus is 0.2.
When it is 0 cN / dtex or less, it is not possible to completely prevent the occurrence of twill deviation at the end surface of the multifilament yarn package for fiber separation, and therefore, the release tension varies in the fiber separation process, and fiber breakage occurs.

The influence of such a change in the release tension due to the twisting is particularly remarkable in so-called Woolly fiber separation, in which the multifilament yarn is once crimped by the spindle false twisting device and then separated. This is because in Wooley separation, the fluctuation in the release tension of the multifilament yarn package directly changes in the tension during the false twisting process, resulting in vertical vibration of the spindle, which leads to yarn breakage and spot untwisting due to fluctuations in the number of twists. This is because it induces untwisting. The entanglement of the portion where the spot untwisting occurs is very strong, and it is impossible to substantially separate the fibers in this portion, and the yarn breaks.

On the other hand, the load tension applied to the stylus is 0.75c.
When it exceeds N / dtex, the yarn separating property in the fiber separating step is deteriorated, and the single yarn is entangled to deteriorate the fiber separating property. The preferable range of the load tension applied to the stylus is 0.20 cN / dt
Ex is more than 0.50 cN / dtex.

A method of manufacturing the above multifilament yarn package is shown in FIG. In FIG. 1, the multifilament yarn 2 spun by the spinning device 1 is provided with an oil agent by the oil supply device 3, and then a pair of heating rollers 4 and 5 are used.
And between the pair of heating rollers 6 and 7 as well,
It is heat-fixed, then entangled by the air entanglement nozzle 8 and wound up as a drum-shaped package 9.

Here, any conventionally known method can be arbitrarily adopted as the means for imparting entanglement, but a method using an air entanglement nozzle is preferable because it is simple and inexpensive and excellent in productivity.

That is, in the present invention, it is important to impart entanglement to the yarn after stretching, preferably stretching and heat setting, and by doing so, generation of stretch unevenness in the drawing step and heat unevenness in the heat setting step. Therefore, it is possible to sufficiently prevent the single filament from being twisted or twisted.

[0023]

The present invention will be described in more detail with reference to the following examples. In addition, each physical property in an Example was measured by the following method.

(1) Load tension applied to the stylus in the entanglement method Using a Rochelled needle pull tester, the load tension is changed by piercing the multifilament yarn with the stylus, and a yarn length of 300 m is measured at a yarn speed of 5 m / min. The number of trips at each load tension was recorded.

If there is even one trip, it is assumed that the stylus has a load tension exceeding its load tension, and if there is no trip at all, the stylus has a load tension less than that load tension. The load tension applied to the stylus was determined.

(2) Twill deviation The end face of the multifilament yarn package was visually observed, and the occurrence state of the twill deviation was evaluated according to the following criteria. ○: No twilling occurred △: Twilling slightly occurred ×: Twilling frequently occurred

(3) Separation property Using a Kanda type separation device, the tension of single filament is 0.8.
Adjust to be ~ 1.0 cN / dtex, 600
Separation was performed at a speed of m / min. At this time, the full winding rate of the monofilament, that is, the proportion of the filament separated into single filaments without breakage was defined as the value of the fiber-splitting property.

Example 1 Using the apparatus shown in FIG. 1, polyethylene terephthalate having an intrinsic viscosity of 0.65 was spun by a spinning apparatus 1 equipped with a spinneret having five orifice holes, and the amount of oil agent applied was 0. After adding the water-based oil agent to 0.8%, the speed is 350 m / min, the surface temperature is 100 ° C.
After being drawn by a pair of heating take-up rollers 4 and 5, the drawing is performed 5.0 times between the heating take-up roller and the pair of heating drawing rollers 6 and 7 and heat-fixed, and then an air entanglement nozzle. 8 was entangled and wound as a drum-shaped package 9 at a speed of 1740 m / min.

The total fineness of the obtained multifilament yarn is 330 dtex, and the fineness of single filament is 55 dtex.
(That is, the number of single filaments was 6). Table 1 shows the twisting of the multifilament yarn package, the load tension applied to the stylus of the multifilament yarn, and the separation property.

[Comparative Example 1] The procedure of Example 1 was repeated, except that the air entanglement nozzle was not used and the multifilament yarn was not entangled. Table 1 shows the untwist of the multifilament yarn package and the splitting property of the multifilament yarn.

[Examples 2-3, Comparative Examples 2-4] Example 1
In Example 1, the same procedure as in Example 1 was performed except that the flow rate of the air entanglement nozzle was changed and the load tension applied to the stylus of the multifilament yarn was changed as shown in Table 1. Table 1 shows the twisting of the multifilament yarn package, the load tension applied to the stylus of the multifilament yarn, and the separation property.

[0032]

[Table 1]

[Brief description of drawings]

FIG. 1 is a conceptual diagram showing a method for manufacturing a multifilament yarn package of the present invention.

[Explanation of symbols]

1 Spinning device 2 multifilament yarn 3 lubricator 4,5 heating take-up roller 6,7 Heat stretching roller 8 air confounding nozzles 9 drum package

Claims (4)

[Claims] 1. A package of multifilament yarn wound in a substantially untwisted state, wherein the multifilament yarn has a load tension applied to a stylus of 0.20 cN per unit fineness in an entanglement method. / Dte
A multifilament yarn package for separating fibers, which is entangled so as to exceed 0.75 cN / dtex. 2. The multifilament yarn package for separating fibers according to claim 1, wherein each filament constituting the multifilament yarn has a round cross-sectional shape. 3. A multifilament yarn for separating fibers, wherein the multifilament yarn is directly spun and drawn, and when the multifilament yarn is wound in a substantially untwisted state, the multifilament yarn is drawn and then entangled. Package manufacturing method. 4. The method for producing a multifilament yarn package for separating fibers according to claim 3, wherein each filament constituting the multifilament yarn has a round cross-sectional shape.