JPH07243143A - Method for producing special rayon yarn - Google Patents

Abstract

PURPOSE:To provide a bulky doubled rayon combined filament yarn having a stable yarn length difference. CONSTITUTION:A method for producing special rayon yarn comprises spinning out fibers from the plural nozzles 1 of a centrifugal pot winding type rayon- spinning device, drawing the spun fibers, producing a difference between rates for feeding the fibers into fiber winders by the difference between the diameters of godet rollers 4-7, and doubling and winding up the fibers having the fiber length difference in the same pots, while twisting operations caused by the rotation of the pots are utilized.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bulky mixed yarn composed of regenerated cellulose fibers used in a woven or knitted fabric for clothing and a method for producing the same, more specifically, a conventional centrifugal pot winding type spinning method. The present invention relates to a bulky compound yarn mixed yarn having a difference in yarn length.

[0002]

2. Description of the Related Art A woven or knitted fabric using regenerated cellulose fibers has a unique silky gloss and pliability,
It lacks bulge and tends to be paper-like. In order to eliminate such drawbacks, it is possible to obtain bulkiness by producing different shrinkage and yarn length differences by using different shrinkage mixed yarns such as synthetic fibers or false twisting of multiple yarns with different physical properties. Even so, the regenerated cellulose fiber is poor in the thermal behavior and the difference in shrinkage as compared with the synthetic fiber such as polyester, and the process is complicated and the cost is increased in order to develop the difference in the yarn length in the subsequent process.

A method utilizing a difference in shrinkage rate of several percent, as disclosed in JP-A-5-247762, can be considered.
When the regenerated cellulose fiber itself has a weak shrinkage stress and is made into a woven fabric structure, a shrinkage difference is difficult to be expressed due to its restraining force, and the regenerated cellulose fiber has a large elongation at the time of wetting, so that it stretches with a slight tension, It is difficult to obtain a stable bulkiness because the difference in yarn length based on the difference in shrinkage that has been expressed is eliminated by the applied force.

[0004]

DISCLOSURE OF THE INVENTION According to the present invention, a stable yarn length difference due to a speed difference is imparted to a regenerated cellulose fiber composite yarn mixed yarn in which shrinkage difference or yarn length difference is difficult to be expressed as described above. Finally, it is intended to obtain a bulged fabric, and to easily and reliably generate a yarn length difference of several% to several tens% in the spinning process by the conventional centrifugal pot type winding and spinning method. To do.

[0005]

According to the method for producing rayon yarn of the present invention, the conventional pot-type rayon spinning method is carried out in such a manner that a 10-odd% drawing is performed for each spindle by a two-stage godet roller. In contrast to the winding for each weight, for example, two or more weights are set as one set, and the yarns that are arbitrarily stretched are caused to have different supply rates at different speeds, and the combined yarn is wound in the same winding pot. It is also possible to use a method in which the yarn spun from the same nozzle is once divided into a plurality of yarns, and the respective arbitrarily stretched yarns are rewound into the same winding pot at different supply speeds. That is, yarns spun from a plurality of nozzles of a centrifugal pot-winding rayon spinning device are drawn (or not drawn), respectively, and then, due to a difference in diameter of a godet roller or a difference in rotation speed, By producing a difference in supply speed and utilizing twisting due to pot rotation, yarns having different yarn lengths are wound into the same pot.

[0006] The method can be carried out in several ways depending on the combination of a yarn guide method and a godet roller. Since a plurality of nozzles and a gear pump are used, the number of filaments, each fineness or draw ratio, etc. Any combination is possible. Further, since the centrifugal pot type winder is used, the twist of 50 to 100 T / m automatically enters the winding yarn, and the slack of one yarn generated due to the difference in speed supply is absorbed by the twist and the winding is performed. Is done smoothly.

However, when a too large difference in supply speed is imparted or the centrifugal centrifugal force is lowered due to the elapse of the centrifugal pot winding time, the slack of the yarn may be difficult to be absorbed by the twist, and in such a case. Is preferably subjected to fluid entanglement treatment or false twisting twisting treatment before winding. In this case, it is necessary to perform entanglement treatment and twisting treatment on the yarn containing the sulfuric acid bath liquid in the sulfuric acid bath atmosphere chamber peculiar to rayon production in terms of material, environment and work. There are many problems. In order to avoid this, it is desirable to reduce the winding amount in the shortest possible time and to dodge.

On the contrary, in order to avoid complexity such as scouring,
In order to provide the entanglement treatment to obtain a stable yarn and winding amount, even a slit nozzle is 1.0 as an entanglement nozzle.
5 if treated with air pressure of ~ 1.5 kg / cm ² or more
Even if a twist of 0 to 100 T / m is present, the entanglement condition is good and a loop yarn can be obtained. Further, in these cases, it is desirable to put the entangled portion in a box such as a Taslan box.

Next, one example of the spinning method of the present invention will be described with reference to the drawings. The yarn of No. 2 is spun by a two-stage roller composed of a roller A and a roller B which are concentrically arranged, and is guided to the funnel guide through the back roller D of the right adjacent weight. The yarn of (1) is spun by a two-stage roller of a roller C and a roller D which are concentrically arranged, and is guided from the maximum roller C before the own weight to the funnel guide. In this case, the diameter ratio between the rollers B and A is the yarn draw ratio, and the diameter ratio between D and C is the yarn draw ratio. Further, the diameter ratio of D and C becomes the difference in the supply speed that causes the slack in the yarn length difference. Of course, the yarn from the roller D is supplied at a low speed to become a core yarn, and the yarn from the roller C becomes slack, resulting in a wound yarn.

According to this method, there is a limitation that the drawing ratio of the yarn and the supply ratio of the yarn are the same. Considering the dimensional stability of both yarns, it seems that the higher the draw ratio of both yarns is, the more the draw ratio becomes the difference in the feed rate. Twisting makes it difficult to absorb the slack of the yarn due to the difference in supply speed,
Forced twisting and entanglement processing are required. In other words, if forced twisting or entanglement treatment is applied, it is preferable that the roller diameter C / roller diameter D is large. In that case, the draw ratio of the slackened yarn increases.

In order to make the yarn length difference large and stable, which is the main object of the present invention, it is an important point how the draw ratio of the core yarn and the side yarn should be. In the case of a synthetic thermoplastic fiber, considering the heat shrinkage of post-processing and process treatment, it is considered that the lower the draw ratio of the core yarn is, the better so that the heat shrinkage of the core yarn becomes larger. Further, in the case of the present invention, it is considered that the core yarn is most preferably unstretched because of the nonstretchability of the cellulose fiber.

However, the characteristics of cellulosic fibers, especially spinning by the viscose method, strongly overturn these ideas. If the yarn to be the core yarn is not drawn, it may be self-expanding due to the tension immediately before winding the pot,
Alternatively, although it is unclear whether or not it is due to the regeneration mechanism after that, a large difference in yarn length is alleviated, and the difference in supply of the mechanically applied difference in roller diameter becomes small as a result.

Therefore, for both the core yarn and the side yarn, a drawing ratio and a feeding speed difference of about 10% are adopted, that is, the roller diameter A
/ Roller diameter B and roller diameter C / Roller diameter D are both set to about 1.1, and the generated yarn length difference is likely to remain, and forcible twisting or entanglement treatment is not required. Can be taken.

In order to obtain a mixed yarn with a large difference in yarn length, 1
If a feed rate difference of 0% or more is adopted, the winding twist number is 50 to 10
At 0 T / m, it becomes difficult to absorb the slack of the yarn, and if the forced twisting or entanglement treatment is not performed, the successful winding is several hours or less. Further, when the difference in the feeding speed is 6 to 7% or less, the drawing ratio becomes low, and the difference in the yarn length of the product yarn after scouring and drying becomes small. I will not be able to. However, the remaining form and a slight bulge which are wound in a spiral shape by the twisted and twisted yarn of the slack yarn remain.

In order to obtain a large yarn length difference of 10% or more in the feeding speed, forced twisting or entanglement treatment is required, and the device is preferably a slit type twisting tool or an entanglement nozzle on the yarn guide. . Since the twisting tool requires a large construction in terms of equipment, it is easy to attach the entanglement device. Also, as mentioned above,
At the time of winding, a large amount of bath bath remains on the yarn,
It is necessary to consider the material and treatment method of the entanglement device.

Speaking of the entanglement nozzle, there is no special need except that a slit type is particularly desirable.
It is necessary to consider the material for acid and alkali, such as using a ceramic yarn path and a resin bracket. Also,
The fluid pressure is about 1.0 to 3.0 atm and can absorb up to about 25% of the thread slack.

[0017]

【Example】

Example 1 A combination of an ordinary round-section spinning nozzle (30H 0.07 mmφ) and an ordinary semi-dull viscose and a roller as shown in FIG. 1 (A = D = 190 mmφ, B = 174 m).
mφ, C = 207 mmφ), with a draw ratio of about 9% and a feeding difference, at a spinning speed (rotational speed of C) of 70 m / min, to obtain a yarn of about 75 denier / 30 filaments × 2 The spinning rate was 5.3 cc / min.

At this time, the number of rotations of the pot (diameter: 180 mmφ) was 133 Hz × 60 rpm, the spinning speed was constant, and continuous winding was carried out for 6 hours. Then, after performing ordinary scouring and drying, the yarn was untwisted and the difference in yarn length was measured, and the result was 4% on average. However, the side yarn having slack became filament itself in the length direction of the yarn. The twist was fixed, and it became a thread with more bulge than the core thread, and it appeared thicker in appearance. In addition, in the obtained mixed fiber yarn, there are innumerable loops of several millimeters to several centimeters. Even if additional twisting of 100 to 500 T / m is applied, the side yarn floating in a twisted shape is observed. It was confirmed that a yarn having a bulge was obtained.

Example 2 By the same method as in Example 1, the combinations of rollers were as follows (A = D = 186 mmφ, B = 175 mm).
φ, C = 198 mmφ), draw ratio and supply difference of about 6.5
%, And spinning was performed. The difference in yarn length of the obtained product is about 1%
However, the twist was left in the form of the side yarn, and the yarn was more bulged than the core yarn.

Example 3 By the same method as in Example 1, the combinations of rollers were set as follows (A = D = 220 mmφ, B = 157 mm).
φ, C = 220mmφ), draw ratio and supply difference about 18%
In addition to spinning, a slit nozzle having a thread diameter of 3.0 mm was used and winding was performed while performing an entanglement treatment at a pressure of 2.5 kg / cm ² of air pressure. However, in the third embodiment, the rotation speed of the pot is 110 Hz × 60.
It was lowered to rpm and wound up under constant conditions.

The obtained product has countless single-millimeter loops of several millimeters, the number of entanglements varies, but the average entanglement is 60 to 80 t / m, and the additional twist is 100 to 500 T / m. Even after application, a loop shape was observed, and it was confirmed that a bulged yarn was obtained.

[0022]

EFFECTS OF THE INVENTION According to the present invention, a yarn having a bulging feeling and a regenerated cellulose fiber yarn in which a fabric is hard to obtain can be easily mixed with a reliable yarn length difference in a conventional pot winding type spinning machine. Came to get.

[Brief description of drawings]

FIG. 1 is a schematic view showing a manufacturing apparatus used in the present invention.

[Explanation of symbols]

 1: Spinning nozzle 2: Thread 3: Thread 4: Godet roller A 5: Godet roller B 6: Godet roller C 7: Godet roller D 8: Guide 9: Funnel guide 10: Entangling device

Claims (2)

[Claims] 1. A method for producing a rayon yarn, wherein in a centrifugal pot winding type rayon spinning method, a plurality of yarns having different feeding speeds are simultaneously wound in the same pot. 2. A method for producing a rayon yarn, which comprises subjecting a plurality of yarns having different supply speeds to a fluid entanglement treatment immediately before being wound in the same pot, and then winding the yarn.