JPS5914579B2 - Spun yarn and its manufacturing method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a spun yarn that can improve the efficiency of producing a knitted fabric and exhibit desirable characteristics as a knitted fabric, and a method for producing the same.

The yarns conventionally used for knitting and weaving can be roughly divided into spun yarns and filament yarns, but although spun yarns have high bulk, they have a limited uniformity of thickness, making it difficult to produce fine count yarns using thick denier fibers. was difficult.

Therefore, knitted fabrics using spun yarn lacked surface uniformity, and it was difficult to produce high-density knitted fabrics.

On the other hand, filament yarns have poor bulk properties, and their knitted fabrics have a cold feel.

Due to the above-mentioned circumstances, various studies have been made to produce spun yarn with uniform thickness, but there are fundamental problems with the conventional spun yarn manufacturing process, and it is difficult to produce yarn with the desired characteristics. 3. In other words, when a sliver is produced from a stable using a carding machine and then spun, it inherently has elements that cause uneven fineness, as well as denier and fiber length. However, there are limitations on the crimped shape and the use of oils, and there are also problems with the equipment.

Furthermore, when making long fibers into staples using a tension cutting roller or a spiral cutter, the characteristics of the obtained fibers may change or the cutting points may not be dispersed, resulting in the use of slivers obtained by these methods. When producing spun yarn, there is a drawback that unevenness in fineness cannot essentially be avoided.

The present invention was obtained in order to eliminate the drawbacks of the prior art, and takes advantage of the excellent homogeneity of multifilament or tow, that is, continuous multifilament yarn with little unevenness in fineness, and To provide a spun yarn and a method for producing the same that can efficiently produce knitted fabrics with uniform texture, high bulkiness, and a warm and soft feel.

That is, the present invention moves a substantially twist-free multifilament yarn in a direction approximately perpendicular to the yarn axis between a first group of feed rollers and a second group of feed rollers having approximately the same surface speed. When the filament is brought into contact with the multifilament cutting device and cut, only the filament gripped by both the first feed roller and the second feed roller is selectively cut, and the multifilament is cut while maintaining the continuity of the multifilament. This method of producing a spun yarn is characterized by uniformly dispersing dots and then converging them and winding them up.

The fiber that is the raw material of the present invention is a continuous multi-filament yarn, and each filament constituting this is preferably untwisted and separated from each other. Available.

The spun yarn of the present invention utilizes the excellent uniformity of continuous multi-filament yarn, and it is necessary to maintain the continuity of the fiber as a whole, and for this purpose, the cutting points are distributed as uniformly as possible. There is a need.

Therefore, it is necessary that the continuous multifilament yarn used as the raw material is substantially twist-free, and specifically, it is preferable to use one with a twist density of 100 times/m or less.

If the twist applied to the continuous multi-filament yarn is significantly larger than the above value, the continuous multi-filament yarn will be transferred as a whole, so only the filaments exposed on the surface will be cut, and the filaments in the center will be cut. This results in the disadvantage that the entire staple cannot be stapled uniformly.

Appropriately, the device used in the present invention is composed of a gripping roller that rotates at a constant surface speed with respect to each other, a cutting device installed between these rollers, and a concentration device installed downstream of the gripping roller. .

However, if no draft is created between the continuous multifilament yarn before processing and the stapled fiber bundle, the continuous multifilament yarn is fed to a pair of gripping rollers, and then cut by a cutting device. It is possible to adopt a method in which the fiber bundle that has been removed is held again by a gripping roller.

FIG. 1 is a side view showing an example of an apparatus for carrying out the present invention.
The multifilament 2 wound around the package 1 is held by the first feed roller 3 and pulled out, and the fiber bundle 2a cut into staples by the cutting device 4 provided between the second feed rollers 5 is discharged from the second feed roller 5. be done.

On the downstream side of the second feed roller 5, the yarn is heated by a twisting device 9 using a ring 6, a spindle 7, and a traveler 8, and is wound into a pirn 10.

As shown in FIG. 2, the cutting device used in the present invention has a rough surface layer 12 made of granular material such as abrasive grains provided on the inner surface of a hollow cylindrical body 11.
A device supported by a belt 14 and driven by a belt 14 can be used.

This rough surface layer 12 has the greatest influence on the cutting condition of the continuous multifilament yarn, but it is preferable to stick abrasive paper inside the hollow cylinder or to fix the abrasive grains with an adhesive.

Further, the hollow cylinder may be provided with a sickle-shaped blade as shown in FIG. 3 or a serrated sickle-shaped blade as shown in FIG. It is also possible to use a cutting device 4a that cuts a continuous multifilament yarn by rubbing a plurality of rotating disks formed thereon around the continuous multifilament yarn.

As shown in FIG. 6, the cutting devices 4 are arranged between a plurality of back rollers 3 and a plurality of front rollers 5, and a plurality of multifilaments 2 are processed. It may be configured to do so.

In addition, as shown in FIG. 7, the cutting devices 4 are arranged in series.
The multifilament 2 of the book may be cut in several stages.

In Fig. 8, a pair of feed rollers 3a serve as both the back side roller and the front side roller, and the multifilament 2 passes through the feed roller 3a, reaches the guide roller 15, and then reaches the feed roller 3a again. In the meantime, the fibers are cut by the cutting device 4 and sent out to the converging device as a stable fiber bundle 2a.

The cutting device must be in contact with the continuous multifilament yarn while moving in a direction perpendicular to the yarn axis of the continuous multifilament yarn, and must be rotating in a plane substantially perpendicular to the yarn axis. This is preferable because it simplifies the device and reduces power consumption.

Methods for converging threads include heating using a ring traveler mechanism, rotor heating for open-end spinning, entangling using air vortices, gluing that combines temporary twisting and thermal bonding, and self-twisting that combines alternating twisting. A twisting method can be adopted.

The twist-free continuous multi-filament yarn used in the method of the present invention includes:
Although it is possible to use a twisted yarn such as a twisted yarn,
This shrinking processing means may be incorporated before the process of producing the spun yarn of the present invention to perform the shrinking process and the production of the spun yarn in one step.

It is also possible to incorporate the manufacturing process of the spun yarn of the present invention into the manufacturing process of the continuous multi-filament yarn used as the raw material of the present invention, such that, for example, an undrawn yarn is drawn, spun, and wound in one step.

In addition, we can supply multiple continuous multi-filament yarns with different types of fibers, different filament finenesses, different shrinkage shapes, different shrinkage rates, etc. to obtain special effects by mixing them. be able to.

Furthermore, as shown in FIG. 7, cutting areas including cutting devices can be provided in multiple stages in the running direction of the thread to increase cutting opportunities, and as shown in FIG. 6, cutting devices can be provided in parallel. It is also possible to combine and mix the cut fiber bundles to obtain, for example, a spun yarn in which fibers of different fiber lengths are mixed.

The present invention is characterized in that fiber bundles obtained by cutting and stapled continuous multi-filament yarns as described above are bundled into spun yarns in a binding step, and the present invention has the following effects.

(a) The spun yarn obtained by the method of the present invention is processed so as not to disturb the alignment of the continuous multifilament yarn, and is composed only of staple fibers having a uniform thickness in the fiber axis direction. , it has a uniform fineness that cannot be obtained with conventional spun yarns.

That is, the average cross-sectional fiber number N and yarn unevenness rate U are Uv
'N<80 has been obtained.

Here, the thread unevenness rate U is Japanese Industrial Standard JISL 1008.
Cotton yarn test method One of method B in Section 5.18.2 was applied using a Worcester-Evenes tester at a sample speed of 25 m%.
The average unevenness deviation measured in minutes is expressed as a percentage.

No matter how precise processing is performed on conventional spun yarn, U
4>80, and has significantly higher yarn unevenness than the spun yarn according to the present invention, and the yarn according to the present invention is significantly superior.

(b) As mentioned above, the spun yarn obtained by the method of the present invention has excellent homogeneity, so it is possible to produce knitted fabrics that have a soft, warm feel and bulkiness, and reflect these characteristics.

Furthermore, since the thickness unevenness of the spun yarn is very small, the surface of the knitted fabric is uniform, and the knitted fabric can be manufactured with extremely high efficiency.

According to the method for manufacturing spun yarn of the present invention, it is possible to manufacture spun yarn from continuous multi-filament yarn in one step, and it is possible to greatly rationalize equipment and personnel, and to improve efficiency and yield. It is possible to increase the power consumption and reduce the required power.

(2) When feeding continuous multi-filament yarn to the cutting device, by making the feeding speed and discharge speed the same, the cutting points of each filament are evenly distributed and the continuity of the fiber bundle as a whole is maintained. can be maintained.

Next, the structure of the present invention and its effects will be explained by examples, but the present invention is not limited to these examples.
Details may be changed within the scope of the technical idea.

Example 1 In FIG. 1, a continuous multifilament yarn 2 serving as a raw material is pulled out from a package 1 by a first feed roller 3, passes through a cutting device 4 and a second feed roller 5, and is heated by a twisting device 9 to become a spun yarn 2b. , is wound up on the pirn 10.

As shown in FIG. 2, the cutting device 4 has a rough surface layer 12 formed by pasting emery paper on the outlet side of the hollow cylindrical body 11.
is the provision.

The cutting device 4 is rotating in the direction of the arrow in FIG. 1, and cuts the continuous multi-filament yarn 2 passing through the hollow portion into a staple shape.
The fiber bundle 2a is made into a fleece-like fiber bundle, but the straightness and parallelism of the fibers constituting it are maintained well, and the fiber bundle 2a is gripped by the second feed roller 5 and discharged.

By the above method, polyester processed with wool and filament yarn (150 denier, 48 filaments) were used as raw materials, the surface speed of both the first and second feed rollers was 20 m/min, and the rotation speed of the cutting device was s. ,
Spinning was performed at ooo times/min and a spindle rotation speed of 9,000 times/min.

The yarn unevenness ratio U of the obtained spun yarn was 5.5, and the fibers constituting the yarn had an average fiber length of 82 mm and a longest fiber length of 210 mm.

In order to compare and evaluate the performance of this spun yarn in the knitting process, we investigated the polyester woolly processed yarn (15
0 denier, 48 filament), and the polyester filament that is the raw material for this.

A conventionally spun yarn (metric count 1/60) consisting of 1-yarn (150 denier, 48 filaments) and 100 threads of polyester staple was prepared.

As a spun yarn using the traditional Tazoshi method, we attempted to spin metric count 1/60 using polyester staples with a 3 denier and 89 mm cut, which is close to the monofilament denier of the target yarn, but the yarn broke frequently during the spinning process. , 1.5 denier,
Spun with 44-cut polyester staple.

The yarn unevenness ratio U, UvK, and specific volume of these yarns were measured and were as shown in the following table.

The tazoshi specific volume was calculated from the diameter and yarn weight of the test yarn wound into cheese under the same conditions.

While the U of the conventional spun yarn is 13.2%, the U of the spun yarn of the present invention is 5.5%, and UvN is significantly lower than that of the conventional spun yarn.

However, the specific volume of conventional spun yarn is 1.9'4 c c
Z9, whereas the spun yarn of the present invention is 2.37 c
c/g, indicating that it has excellent bulk and homogeneity.

Next, when the sample was knitted into a jersey using nine 28-gauge sinkers, the conventionally spun yarn frequently broke, resulting in a knitted fabric full of scratches.

The remaining three types of yarn could be knitted smoothly, and there were no defects in the knitted fabric.

We attempted to apply knitted fabrics made of three types of yarns other than conventionally spun yarns to shirt and blouse fabrics, but fabrics using filament yarns or wool-processed yarns lacked a sense of thickness; Although it was unsuitable due to the unpleasant feeling of stickiness to the skin, the knitted fabric using spun yarn of the present invention solved this problem and exhibited extremely high surface quality and a soft feel.

Example 2 In the process shown in FIG. 1, the speed ratio of the first feed roller 3 and the second feed roller 5, the mounting position of the cutting device 4,
Various yarns were spun using the same continuous multifilament yarn as in Example 1 as a raw material by changing the inner diameter or the particle size of the emery paper.

Three types of conventionally spun yarns (card method and direct spinning method) (samples in the table below/16.8 to 10) were added to this and knitted using nine 24-gauge sinkers, and the knitting performance, knitted fabric quality, and texture were evaluated. A comparative evaluation was made.

The results are shown in the table below, and Samples/163 and 10 were also evaluated in Example 1.

[Brief Description of the Drawings] Figure 1 is a side view (1
Figure 2 is a side sectional view of the cutting device, Figures 3 and 4 are front views of the blades used in the cutting device, and Figure 5 is a perspective view of the cutting device using a disc. , Fig. 6 is a front view showing a device in which cutting devices are arranged in parallel, Fig. 7 is a front view showing a device in which cutting devices are arranged in series, and Fig. 8 is a sliver manufacturing device using one set of feed rollers. FIG. 1... Package, 2... Multifilament (multifilament yarn), 2a... Staple fiber bundle, 3... First feed roller, 3a...・
...Feed roller, 4.4a... Cutting device, 5... Second feed roller, 6...
Ring, 7... Spindle, 8... Traveler, 9... Twisting device, 10... Purn, 11... Hollow cylindrical body, 12...
Rough surface layer, 13, 13'...bearing, 14...
...Belt, 15...Guide roller.

Claims (1)

[Claims] 1 A substantially twist-free multifilament yarn is brought into contact with a cutting device that moves in a direction approximately perpendicular to the yarn axis between a first group of feed rollers and a second group of feed rollers that have approximately the same surface speed. When cutting the filament, only the filament held by both the first feed roller and the second feed roller is selectively cut;
A method for producing a spun yarn, which comprises uniformly distributing cutting points while maintaining the continuity of the multifilament, and then converging and winding the multifilament.