JPS601414B2 - Untwisted spun yarn - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a novel untwisted spun yarn having a novel structure.

Conventionally, it has been known to produce substantially untwisted bound spun yarn by gathering continuous fibers such as tow and sub-tow into cut fibers and then subjecting them to false twisting.

For example, Japanese Patent Publication No. 43-28250 discloses that the fibers in the shape of a glue bond after cutting are concentrated using an aspirating jet and then false-twisted using a torque jet to make the fibers substantially free of T-short fibers. A method for producing a non-twisted bundled spun yarn consisting of a core portion consisting of twisted fibers and a surface fiber portion which is spirally wound around the core portion and wrapped and bundled to bind the entire core portion. Are listed. However, as shown in Figures 6 to 8 of Japanese Patent Publication No. 43-28250, such conventionally known bound spun yarns have a structure in which all the fibers constituting the core portion are tied together by surface fibers at the binding point. Because of this, it has the disadvantages of being bulky as a yarn, lacks flexibility, and poor texture.Also, since the yarn has a constricted structure at the binding point, it has the disadvantage of not having a good texture when made into woven or knitted fabrics. have The main purpose of the present invention is to provide a non-twisted spun yarn having a novel structure that eliminates the above-mentioned drawbacks of conventional bound spun yarns, and another purpose is to provide a low-cost spun yarn that can be manufactured with stable process conditions. The purpose of the present invention is to provide a non-twisted spun yarn.

This purpose is mainly composed of substantially untwisted fibers consisting of short fibers with an average fiber length of 250 to 150 m, and a part of the short fibers constituting the fibers is 1'4 to 1'4 of the number of fibers constituting the fibers. 1
This is achieved by the non-twisted spun yarn of the present invention, which is characterized in that 2/2 are bundled together to form binding points, and that one or more binding points are scattered per 1 ship's length of the yarn. The short fibers constituting the untwisted spun yarn of the present invention are preferably synthetic fibers such as polyester, nylon, acrylic, vinylon, etc., but may also be artificial fibers such as rayon, acetate, or natural fibers such as cotton, wool, hemp, etc. It may also be a mixture of two or more types of fibers.

In the present invention, polyester fibers, particularly polyethylene terephthalate fibers, are particularly preferred. It is necessary that the average fiber length of the short fibers is 250 to 150 m. If the average fiber length is shorter than 25 m, sufficient yarn strength cannot be obtained, and the average fiber length If it is longer than 150 ribs, it becomes filament-like and loses its good texture as a spun yarn.

When using polyester fibers as short fibers, the total single denier is 0.6 to 7 de, and the single fiber strength is 2 to 10 tano d.
e. If a single fiber paper with an elongation of 20 to 150% is used, a particularly excellent spun yarn can be obtained. Hereinafter, the present invention will be explained in detail with reference to the drawings.

FIG. 1 is a micrograph showing the structure of the novel untwisted spun yarn according to the present invention, and FIGS. 2 and 3 each show an example of the method for producing the untwisted spun yarn of the present invention. The figure is a side view, and FIG. 3 is a top view. As is clear from FIG. 1, the untwisted spun yarn of the present invention has an average fiber length of 250 to 150.
Mainly consists of substantially untwisted fibers in which a large number of short fibers (preferably 20 to 500) are concentrated, and some of the short fibers constituting the fiber bundle constitute the fibers. The short fibers are wound spirally around 1/4 to 1/2 of the total number of the short fibers, and are wrapped and bundled to bind a part of the fiber east to form a binding point.

The number of bundled short fibers at each binding point is 1 in total.
When it exceeds No. 2, it becomes similar to conventional bound spun yarn,
If it is less than 1/4, the grip and conjugation properties of the short fibers will decrease, which is not preferable. In the untwisted spun yarn of the present invention, a large number of the binding points are randomly scattered throughout the yarn, and an average of 1 or more, preferably 2 to 1 binding points are present per yarn length.

When the density of binding points is less than 1 per 10 skins, the binding of short fibers decreases, and the yarn strength decreases. However, if there are too many binding points, the bulky properties of the yarn will be impaired, so 3 is preferable.
. The untwisted spun yarn of the present invention has an English count (cotton count) of 5.
It is preferable to have a count of ~10, and the untwisted spun yarn of the count made of polyester fiber has a bulky property of 2 to 5.
In the evening, it became 3 with a thread with a strong utilization rate of 25-85%.

The untwisted spun yarn of the present invention as described above has sufficient yarn strength because the binding points where the fiber east is partially wrapped and bound are scattered in the yarn, and moreover, at each binding point, the entire fiber east is Since it is not tied together, it has the advantage of being bulky and flexible, and has a good surface when made into a woven or knitted fabric.

Therefore, the untwisted spun yarn of the present invention is useful not only in the field of clothing but also in the field of industrial materials such as children's cloth, canvas, and sewing thread. Next, an example of a method for producing the untwisted spun yarn of the present invention from tow or sub-tow will be explained with reference to FIGS. 2 and 3.

In Figures 2 and 3, lt is toe or sapt toe,
2a and 2b are feed rollers, 3 is a heat plate, 4
a, 4b are stretching rollers, 5a, 5b are cutting rollers, 6
7 indicates an apron, 7 indicates a false twisting device, and 8 indicates a yarn guiding guide.

After the tow or sub-tow lt is hot-stretched to a predetermined magnification between feed rollers 2a, 2b and stretching rollers 4a, 4b, the elongation at break of the fiber is adjusted between stretching rollers 4a, 4b and cutting rollers 5a, 5b. Drafted and cut to a higher magnification, short fibers (fleece) in a ribbon shape
becomes. Subsequently, the short fiber East 1 is passed through the upper cutting roller 5.
Then, from the surface of the roller 5a, the short fibers are rolled up and pulled out in an oblique direction as if twisting a piece of paper, giving a false twist and conjugation at the same time as gathering. In this case, it is possible to change the texture of the yarn by selecting the false twisting direction according to the drawing direction of the short fibers East 1. For example, when applying false twist in the direction of the arrow as shown in Fig. 3, it is possible to change the texture of the yarn.
- The short fibers on the layer 5a are rolled up one after another, resulting in a relatively stiff texture. When false twisting is applied in the opposite direction, the short fibers east on the rollers 5a are wound from top to bottom, resulting in a product with even greater bulkiness. After exiting the false twisting device 7, the fibers are decombusted and theoretically become non-twisted fibers, but by going through the process described above, the main short fibers are partially wrapped and bound as shown in Figure 1. The result is a spun yarn with a structure in which binding points are scattered here and there. The reason for this has not yet been completely elucidated, but it is thought to be as follows.

FIG. 4 is an enlarged view of the vicinity of the cutting roller 5a, and FIG. 5 is an enlarged view showing the state of the yarn winding part. The short fibers are wound one after the other (irregularly) on top of each other, forming a kori-like thread 1'. Even after passing through the twisting device 7 and being falsely twisted, the fibers wound on the surface are unraveled by the twisting force, but the fibers wound near the core are not unraveled properly.

The wound fibers remain in some places to form the yarn 1'' having the structure of the present invention. Therefore, in order to industrially produce the untwisted spun yarn of the present invention, it is necessary to use short fibers as described above. It is effective to twist the short fibers in such a way as to wind them, and such a structure does not occur simply by temporarily burning the short fibers. It is extremely efficient because it is supplied with a continuous spun yarn in one process, but it is also possible to draft pre-produced short fibers into strip-shaped short fibers and process them in the same way. In addition, as the false twisting Z imparting device 7, in addition to the internal friction false twisting device shown in Figs. 4 and 5, external friction false twisting devices, spindles, torque jets, etc. can also be used. It is also possible to impart a false twist by pressing the short fibers against the edge of the cutting roller 5a and rolling them on the roller edge.Next, embodiments of the present invention will be described in detail.

In addition, the bulkiness and strong utilization rate in the example are values obtained from the following formula. Volume of bulky J yarn (base) Bulky property (flow = weight of yarn) Strong utilization rate Strong utilization rate E (%) = Tanrei fog committee protection army hair ≠ etc. ≧ X・〇.

%) Examples Intrinsic viscosity [ri] fo. 60, the first to
Using the apparatus shown in Figure 5, the heater temperature was 170 pm and the stretching ratio was 1. After stretching at Kanon, 123% was drafted at Kenkiri Castle and cut into the following fleece.

Fleece cut after cutting Single woven fiber strength phantom e Total wire strength after cutting 277de Single machine total strength 4.3/de Single fiber elongation 26% This fleece is continuously wound around the cutting roller 5a and then wound from above the roller. Temporary lacquer was applied while pulling out the paper so that it would fit tightly, and the paper was wound up at a speed of 500 skins/min.

When the obtained spun yarn was observed under a microscope, it was as shown in FIG. Yarn structure and physical properties Average fiber length: 50 Guafan Average number of constituent fibers: 92 Density at east feeding point: Average 2.9/Yam length: 1 Number of enveloped fibers at the bow tie point: Average of approximately 30 Product number: 20'S Strength utilization rate: 60% Bulky property: 2.5 luster/yarn unevenness (0%): 10.5% Next, when this yarn was woven into a plain weave, a fabric with good bulky property and grain surface was obtained. .

Next, we conducted an experiment by changing the inter-roller gauge (average fiber length in short fiber east) at Kenkiri Castle, and measured the strength utilization factor E of the obtained yarn, and the results shown in Figure 6 were obtained. It was done. It can be seen from FIG. 6 that a yarn with sufficient strength can be obtained with an average fiber length of 25 m or more.

[Brief explanation of the drawing]

FIG. 1 is a micrograph showing the structure of the non-twisted spun yarn of the present invention;
FIGS. 2 and 3 are side and top views showing an example of the method for manufacturing the non-twisted spun yarn of the present invention, and FIGS. 4 and 5 are views 2 to 3.
FIG. 6 is an enlarged sketch of the winding part and the zero binding part in the figure, and is a graph showing the relationship between the gauge finish of the Kenkiri castle and the strong utilization rate E of the thread. lt. ...Tow or sub-tow, 2a, 2b...Feed roller, 4a, 4b...Stretching roller, 5ta, 5
b...Ken-kiri roller, 7...False twisting device. Min'zu 2 figures 3 figures outside 4 figures O; zu soup et al figures

Claims (1)

[Scope of Claims] 1. A substantially untwisted fiber bundle consisting of short fibers with an average fiber length of 250 to 1500 mm is the main component, and a part of the short fibers constituting the fiber bundle is 1/4 of the number of fiber bundles. ~1/2 is wrapped around and tied to form a binding point, and the binding point has a yarn length of 10 m.
A non-twisted spun yarn characterized by having one or more pieces scattered per m. 2. The untwisted spun yarn according to claim 1, wherein the short fibers are polyester fibers. 3. The untwisted spun yarn according to claim 2, wherein the bulkiness of the yarn is 2 cm^3/g or more and the tenacity utilization rate is 25% or more.