JPS60209035A - Production of bulky spun yarn - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

Detailed Description of the Invention [Technical Field] The present invention continuously untwists and heats a single yarn or various types of spun yarn to produce bulky and soft single yarn spun yarn with a lot of fuzz or various types with a lot of fuzz. The present invention relates to a manufacturing method for obtaining a spun yarn of the above-mentioned type.

<Prior Art> In order to obtain a spun yarn having bulkiness, a method is known in which fibers that shrink upon heat treatment and fibers that do not shrink are mixed to form a spun yarn, and then the spun yarn is heat-treated. Although this method is an excellent method for producing bulky spun yarn, it has to be combed prior to heat treatment, and as a result, there are problems in that the yarn becomes zeta-shape and that the productivity is very poor. Also, by taking advantage of the fact that open-end spun yarn has higher bulk than ring-spun yarn, we have developed a manufacturing method that provides flexibility or flexibility and even better bulk by untwisting open-end spun yarn. is JP-A-55-6702
It is disclosed in Publication No. 7.

However, this method requires that the open-end spun yarn be separately subjected to a twisting machine such as a VC') twister, double twister, or up twister for untwisting, which increases the number of spinning steps and energy costs. I don't like it when connected. In addition, untwisting the spun yarn reduces the actual number of twists and decreases the yarn strength, which has the problem of increasing the occurrence of yarn breakage in subsequent processes (knitting, weaving). Various systems, especially the most commonly used twin yarns, have excellent performance in terms of evenness and smoothness and are used for a variety of purposes. When used as silk or textiles, it is preferable because it has an excellent cover factor and can give a soft feel.

However, at present, no method has been found that allows mass production of various systems having such uniform fluff.

The present inventors have conducted extensive research while studying the structure of spun yarns in order to find a manufacturing method that can mass-produce bulky and soft single spun yarns with a lot of fuzz or various types of spun yarns with a lot of fuzz at low cost. As a result, the present invention was achieved.

<Objective of the Invention> The present invention provides a method for producing a bulky spun yarn that can mass-produce bulky and soft single yarns with a lot of fuzz or spun yarns of various types with a lot of fuzz at a low cost. The purpose is to

<Structure of the Invention> The above object of the present invention is achieved by a method for producing bulky spun yarn, which is characterized by continuously untwisting and false twisting a single yarn or spun yarn of various types.

The spun yarn used is preferably a ring spun yarn or an open-end spun yarn because a bulky spun yarn with excellent quality can be obtained based on the difference in yarn structure.

Further, it is more preferable to carry out continuous untwisting and heating by air false twisting. This is because a large amount of fluff can be generated by airflow. It is particularly preferred that the invention of the present method for imparting fluff to various systems is carried out by air false twisting.

Specific explanation of the structure> The method for producing bulky spun yarn of the present invention involves continuously untwisting and heating a single yarn or various types of spun yarn in a direction opposite to the twisting direction (twisting direction) of the spun yarn. This is a method in which the spun yarn is subjected to untwisting and heating-type false twisting. When a single spun yarn is untwisted and false-twisted by heating, the twist of the spun yarn decreases in the untwisting stage, which loosens the mutual restraints of the constituent fibers and applies centrifugal force to the spun yarn. As a result, the ends of some of the fibers and the center of some of the fibers in the plurality of fibers constituting the spun yarn become ridges that stand out on the surface of the spun yarn.

In this way, the ends or central portions of the multiple fibers that stand out on the surface of the spun yarn are twisted during the heating stage of false twisting immediately after that, and the constituent fibers are restrained.As a result, the spun yarn after false twisting A large number of fluffs and loop-shaped buried fluffs at both ends are formed, resulting in a bulky and soft spun yarn.

The method of the present invention can be used for any type of spun yarn, and provides excellent bulky yarn. However, in the case of ring-spun yarn in which each single fiber constituting a single spun yarn is twisted in a substantially parallel arrangement, the single fibers may be partially twisted during processing depending on the untwisting/heating false-twisting processing conditions. It is easy to miss the target and form a pill. On the other hand, open-end spun yarn has a structure in which each single fiber is intertwined in the spun yarn as is well known, so the untwisting and untwisting of the present invention
It is possible to provide stable heating false twisting.

In other words, open-end spun yarn is different from ring-spun yarn,
There are wrapped fibers such as bridge fibers or jump fibers, and in the case of combing opening, there are many hook fibers because the fibers are transported by combing needles. Also, since it is made by stripping and heating the rotor fiber bundles, the inner and outer layers have different structures. When the open-end spun yarn having such a structure is subjected to the untwisting and heating false twisting of the present invention, the aforementioned fluff and the fluff buried at both ends are removed from the yarn by relaxation of the wound fibers and centrifugal force during the untwisting stage. As many slags appear on the surface, different twist structures are rearranged in the inner and outer layers, and this state is fixed in the next heating step.

Furthermore, in the case of open-end spun yarn, the fibers in the system are intertwined even during the untwisting process, which prevents relative displacement of the fibers in the system as in the case of ring yarn, resulting in pill-like fuzz. Without this, a single spun yarn that is fluffy, bulky, and soft can be obtained.

The method for producing bulky spun yarn according to the present invention involves continuous untwisting.
It is characterized by heating. Therefore, the period during which the constraints on the constituent fibers are loosened during the untwisting stage is extremely short;
During that short period of time, as mentioned above, fuzz is generated and heated immediately, so no special external force is applied to the loose yarn during untwisting. Much more untwisting can be applied than when untwisting and heating are performed separately. Therefore, by using the method of the present invention, sufficient amount of the above-mentioned fuzz etc. can be generated, and an excellent bulky spun yarn can be obtained.

Various methods can be used for the false twisting in the untwisting heating, such as an air false twisting method, a mechanical pin type false twisting method, and an internal or external friction type false twisting method.

However, in the pin method, the fluff of the spun yarn tends to get entangled with the pins, and in the friction type, the surface of the spun yarn tends to be rubbed and the fluff tends to fall off. On the other hand, the air false twisting method is excellent because it does not touch the spun yarn, so it does not damage the spun yarn, and it also generates a large amount of fuzz.

The air false twisting or other false twisting device may be installed in the middle of the yarn path of the winder, as shown in FIG.
As shown in the figure, it is preferable to provide it just before the winding part where the yarn taken from the rotor of the open-end spun yarn is wound up. That is, in the case where the winder schematically shown in FIG. 1 is provided with a false twisting device 1, the yarn from the supply package 5 passes through the false twisting device 1 to form a bulky spun yarn 2, and then obtains a yarn guide 6 for winding. It is wound up on a take-up roll 3 to form a yarn package 4. On the other hand, in the case where the false twisting device 1 is provided in the open-end spinning device 1o shown in FIG. The bulky spun yarn 2 is then wound up on a winding crawler 3 to form a yarn package 4. The method of the present invention can be carried out by simply arranging a false twisting device in a part of a conventional spinning machine, so there is no need to increase the number of steps, the equipment is inexpensive, and it is stable. can be mass-produced. Note that a machine exclusively for false twisting may be made and used.

The untwisting rate of the false twist of the untwisting and heating (a: set number of twists of the spun yarn, b: actual number of twists of the spun yarn in the untwisting region,
'-''/, expressed as x 1 o
It may be selected within the range of 60 inches depending on the fluff and bulkiness of the desired bulky spun yarn.

When the untwisting rate is 10 or less, the occurrence of fluff and bulkiness is small, and the practicality is poor. On the other hand, if the untwisting rate is 60% or more, the yarn strength will decrease significantly and yarn breakage will occur, which is not preferable. There is almost no difference in the actual number of twists of the spun yarn before and after false twisting, and the decrease in yarn strength is within the above range by 1 (l).
This is only a minor problem and poses no practical problem. The processing speed of false twisting depends on the machine used (for example, winder or open-end spinning machine) and the count, but it is 20 m/min.
It is possible in the range of ~1000 m/mil. The air pressure is 1k depending on the shape of the air false twisting nozzle and processing speed.
g/1M2 to 6 and 9/I:In". Regarding the shape of the air false twisting nozzle, a usual heating/untwisting type nozzle for filaments can be applied mutatis mutandis.

〉V will explain the case where the method for producing bulky spun yarn according to the present invention is applied to various systems such as double yarn. When various systems are subjected to false twisting by untwisting and heating, the restraint of the systems by ply-twisting is first loosened during the untwisting stage, and at the same time fluff is generated in the single yarns due to centrifugal force, friction, etc. In order to generate more fluff, it is preferable to use an air false-twisting nozzle as the false-twisting device.

In this way, after a large number of fuzz is generated from a single yarn, it is immediately heated to obtain various systems with a large amount of fuzz. Since the fluff is continuously applied by the false twisting device, it is uniform, and since the fluff is generated in the single yarn, the bulkiness in various systems is slightly increased and the yarn is made soft. In the case of various systems, the single spun yarn may be either ring-spun yarn or open-end spun yarn. Therefore, by using the method of the present invention, it is possible to obtain a fluffy, bulky and soft single-filament spun yarn or yarns of various types with a lot of fluff. Furthermore, by changing the untwisting rate, it is possible to obtain spun yarns with different added values, such as the degree of fuzz, which have not been seen before. Since the method of the present invention can be carried out by simply arranging an untwisting/heating type false twisting device in a part of a conventional spinning machine, it is possible to stably mass-produce bulky spun yarn and provide it at low cost. Can be done.

<Example> The present invention will be specifically described below with reference to examples.

The definitions and measurement methods of the characteristics described in Examples are shown below.

◎ Pal Φ-coefficient Maeda type compression elastic machine is used. Wrap the sample completely and place it in a constant temperature room (
Leave it at 20°C ± 2°C, 60° ± 2°) for 30 minutes or more, cut it, put it in a compression elastic machine box (4 crn x 5 α x 43), cover it with a lid plate, and install the load cell 14.4 flcrd'.
Apply a pressure of , read the scale after leaving it for 1 minute, and calculate the Chivalky coefficient using the following formula.

◎ Fluff index of 1x or more It is expressed as the number of fluffs of IX or more per m using a fluff counting device (Model DT-104).

◎ Bending rigidity of yarn The bending rigidity of the yarn was measured using a pure bending tester (Kws-F2) manufactured by Kato Iron Works, and the flexibility of the yarn was evaluated. The smaller the number, the softer the thread.

Example 1 Raw cotton used, acrylic synthetic fiber (registered trademark Cashmere a)
y) 1.5d-38al oos spun yarn prisoner...Toyota H
752Nrn using 8-5 type open end spinning machine
Spinning is performed with a twist coefficient α=115. Spun yarn (uniformity): The spun yarn of ① above is subjected to the following processing.

Add an air false twist nozzle to the first process of the winder.Espeedro 00 m/min 4 kg/err? Untwist and heat false twist under the following conditions. The physical properties of the spun yarns of ■ and ■ were compared, and the basis weight was compared using silk.

As shown in Table 1 below, the spun yarn (6) of the present invention is bulkier and has a higher number of fluff than yarn, making it soft and light as a yarn and fabric. At this time, the untwisting rate of the spun yarn (■) was 23%. Also, spinning yarn times.

When (b) was milled on a 1000 circular knitting machine,
Prisoners were difficult to organize and (6) was in good condition.

Example 2 The above-mentioned spun yarn '762 Nm was untwisted with an untwisting number of 250 T/I in the untwisting direction to the original twisting number of 830 T/n, and a spinning yarn was used.

As shown in Table 2 below, spun yarn C) had lower tenacity than spun yarn C), and also had less bulk and fluff.

Example 3 The same raw cotton as in Example 1 was used, and the Toyota RY-2 type link ring spinning machine was used, '/'52 Nm, twist coefficient α = 95.
A spun yarn was obtained (spun yarn (2)). This spun yarn (c) was subjected to false twisting under the same conditions as the spun yarn of Example 1 to obtain a spun yarn (g). Also, the top/bottom ratio for spun yarn (c) is 0.
．． A spun yarn (2) was obtained by performing the double yarn processing in step 7 and then false twisting under the same conditions as the spun yarn (2) of Example 1. The spun yarn (G) was bulkier and had more fuzz than spun yarn (3), but the fluff was partially fluffy. On the other hand, spun yarn [F] is bulkier.

[Brief explanation of the drawing]

FIG. 1 is a schematic front view showing an example of an apparatus for carrying out the method of the present invention, in which a false twisting device is arranged in a winder, and FIG. 2 is a schematic front view similar to FIG. 1 with the device arranged; FIG. DESCRIPTION OF SYMBOLS 1... False twisting device, 2... Bulky spun yarn, 3... Winding roll, 4... Yarn package, 5... Supply package, 10... Open-end spinning device. Patent applicant Asahi Kasei Kogyo Co., Ltd. Patent agent Akira Ikuki Patent attorney Kazuyuki Nishidate Patent attorney Akira Yamaguchi Patent attorney Masaya Nishiyama Figure 1 Figure 2

Claims (1)

[Claims] 1. A method for producing bulky spun yarn, which comprises continuously untwisting and heating a single yarn or various types of spun yarn. 2. The method according to claim 1, wherein a single open-end spun yarn is continuously untwisted and heated. 3. The method according to claim 1, wherein the untwisting and heating are performed by an air false twisting method.