JPS5922807B2 - Manufacturing method of composite false twisted yarn - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for producing a composite plate twisted yarn that takes advantage of the respective characteristics of regenerated cellulose multifilament yarn and thermoplastic synthetic filament yarn.

Conventionally, false twisting has typically been performed on thermoplastic synthetic filament yarn alone, and the texture after weaving or knitting becomes plastic-like, which is a characteristic of the yarn. This is a major drawback as a material for use.

Moreover, the yarn has low hygroscopicity and is not suitable as a material for spring/summer clothing, which is a problem in the synthetic fiber industry for clothing.

Various attempts have been made to solve the above two problems.

First, as a method for improving plastic-like materials, it is widely practiced to give a certain degree of crispness by twisting the yarn after false twisting, but this method requires more steps and is industrially disadvantageous.

In addition, the texture has been improved by using various cross-section yarns, but their moisture absorption is low and they are not satisfactory as materials for clothing.

Taking these points into consideration, there have been attempts for a long time to composite thermoplastic synthetic filament yarn and regenerated cellulose multifilament, but when both are simultaneously subjected to a known false twisting process (this is a process that creates a Differences in thermal shrinkage rates (this causes walnuts to occur during processing, making it difficult to perform stable processing.

In particular, in the mechanical false twisting method using a spindle, the walnuts of the regenerated cellulose multifilament yarn become entangled with the spindle, causing yarn breakage.

As a method to improve this, regenerated cellulose multifilament yarn and thermoplastic synthetic filament yarn are pre-combined and twisted, or they are mixed by electro-spreading, interlacing, lath run, etc., and then false-twisted. It is proposed to do so.

However, in the above method, the twisting and entangling treatments between the filaments that are performed before processing are time-consuming, resulting in low productivity.

The present inventors have completed the present invention as a result of studying from various points of view a method for manufacturing composite plate twisted yarn that can overcome the above-mentioned drawbacks and produce high quality, inexpensive, and efficient yarn.
The present invention is characterized in that after the regenerated cellulose multifilament yarn is introduced into a hollow tube nozzle containing a swirling fluid to impart elasticity, the regenerated cellulose multifilament yarn is aligned with the thermoplastic synthetic filament yarn and both are subjected to false twisting at the same time. It is something to do.

According to the present invention, a composite plate twisted yarn can be obtained in one step, and the production is stable, and there is no yarn breakage caused by walnuts in the recycled multifilament yarn as in the past.

In addition, the produced yarn is not only hygroscopic, but the texture of the woven or knitted fabric after force-strengthening has a moderate crispness and luster, and due to the effect of the regenerated cellulose multifilament yarn, it is free from static electricity. There is no static charge, and due to the effect of the thermoplastic synthetic filament yarn, it hardly loses its shape after washing, and has extremely excellent performance for clothing.

In other words, by combining the two types of filament threads, it has a harmonious effect, and also has a suitable texture and luster, without being plastic-like, and to a certain extent. A feature of the present invention is that it is possible to produce a completely new fiber material having the same bulkiness in one step.

The present invention is based, first of all, on the discovery that when a regenerated cellulose multifilament yarn is introduced into a hollow tube nozzle with a swirling fluid, a large degree of elasticity is imparted to the yarn.

To explain this phenomenon using FIG. 1, the regenerated cellulose multifilament yarn IE is subjected to swirling flow treatment by the hollow tube nozzle 3 between the roller 2 and the roller 4.
In the step of winding up the yarn in step 5, the yarn is not subjected to a very large number of false twists by the swirling fluid, and sufficient stretchability is imparted within the stress relaxation time.

Of course, the elasticity, or crimp, of the yarn is not permanently fixed, and will gradually decrease if left for a certain period of time, but this has been previously thought to be impossible, and ita regenerated cellulose multifilament yarn. It has been found that it is possible to impart elasticity to the material, albeit in a short period of time.

Here, it is most effective when the excess supply rate of yarn between rollers 2 and 4 is 8 to 35%.

If the excess supply rate is 8% or less, the twisting effect due to the swirling flow will be reduced, and although the yarn after the rollers 4 will have elasticity, it will not be sufficiently effective.

Also, if the excess supply rate exceeds 35%, it will be oversupply.
The yarn leaving the roller 4 travels with kinks, which is inconvenient.

In this way, the inventors of the present invention have confirmed that it is possible to stably wind the yarn into 5 pieces at a winding speed that is 20% slower than the speed of the 69 roller 4, and using the above method. It can give elasticity.

In addition, as shown in Fig. 2, the present inventors have confirmed that the crimp becomes slightly stronger when a contact heater 6 is provided in the intermediate region between the roller 2 and the hollow tube 3 having a swirling flow. It is sufficiently effective at a temperature of 130°C.

FIG. 3 is a manufacturing process diagram of the composite plate twisted yarn according to the present invention.

The regenerated cellulose multifilament yarn 1 is fed between the rollers 2 and 4 in an overfeed of preferably 8 to 35%, and is heated in this area by a hollow tube nozzle 3 with swirling fluid so that it is heated on the roller 4. The two yarns may be drawn in alignment with the thermoplastic synthetic filament yarn 7, but the two yarns may be drawn in alignment before the roller 4, on the roller, or after the roller.

Next, both filament yarns are preheated by a heater 8 to plasticize the thermoplastic filament yarn, and immediately some kind of twisting mechanism 9 is applied.
After passing through rollers 10, it is oiled at 11 and then rolled up at 5.

When the twisting mechanism 9 is a spindle type, the regenerated cellulose multifilament yarn hardly causes thermal shrinkage when both yarns are guided directly to the roller 4 and subjected to force, so the yarn does not walnut or tangle on the spindle pin. As mentioned above, it is impossible to achieve stable production by
It has been found that, using the method of the present invention, the regenerated cellulose multifilament has sufficient elasticity and can be stably produced without any walnuts occurring in the spindle portion.

Furthermore, if a heater is provided after the roller 10, the produced composite textured yarn can be made into a high-quality yarn with less snarl and improved knitting workability.

The composite plate strands produced by the method of the present invention are thus highly crimped and have improved bulk, covering power and hand.

The regenerated cellulose multifilament yarn used in the method of the present invention is viscose rayon or cuprammonium rayon.

Thermoplastic synthetic filament yarn is a fiber material that has heat-setting properties, and includes polyester, especially synthetic fibers such as polyethylene terephthalate, polyhexamethylene adipamide, polyolefin, and polyacrylonitrile, composite fibers, and semi-synthetic fibers such as acetate. Examples include.

According to the method of the present invention, it is possible to smoothly produce a composite plate twisted yarn in any ratio of regenerated cellulose multifilament yarn and thermoplastic synthetic filament yarn, but in terms of the value of the obtained composite plate twisted yarn, regenerated cellulose multifilament If the yarn content is less than 10% by weight, it is meaningless as an uninvented composite plate twisted yarn from the viewpoint of its texture and hygroscopicity, and if the proportion of regenerated cellulose multifilament yarn is too high, The crimp retention after dyeing, which is a characteristic of false twisted yarns of thermoplastic synthetic filament yarns, becomes inferior, and the yarn loses its meaning as a composite plate twisted yarn.

The upper limit of the proportion of regenerated cellulose multifilament yarn in the composite board twisted yarn that can maintain this characteristic varies somewhat depending on the type of thermoplastic synthetic filament yarn used.

For example, when polyester yarn is used, even if the proportion of regenerated cellulose yarn is 70% by weight, the crimp after dyeing is almost completely maintained.

However, when polyamide yarn, polyacrylonitrile yarn, acetate yarn, etc. are used, crimps will not be maintained sufficiently during dyeing unless the weight is 50 weight or less, preferably 30 weight or less.

Regardless of the type of thermoplastic synthetic filament yarn, if the proportion of regenerated cellulose multifilament yarn exceeds 80% by weight, it loses its meaning as a false twisted yarn from the viewpoint of crimp retention after dyeing.

From the viewpoint of color fastness, it is preferable to use viscose rayon as the regenerated cellulose multifilament yarn.

Viscose method rayon yarn has a skin-core structure, and generally has higher color fastness than cuprammonium method rayon yarn, making it more suitable as a material for clothing, which is the field of application for the composite plate twisted yarn manufactured by the method of the present invention. Are suitable.

In addition, the cross section of the viscose method rayon yarn is not circular but has many irregularities, so it has a unique luster and a crisp feel, so even after the composite plate twisting process, those winds will be lost. The unity is not lost.

The heating mechanism 9 after the two types of filament alignment according to the present invention can employ either a spindle method or a friction method, but a composite heating mechanism 9 generated by a heating method using a hollow tube nozzle having a swirling fluid can be used. The plate twisted yarn has a special shape.

In other words, the thermoplastic synthetic filament yarn tightly has an autorotation twist in which S and Z are alternately reversed at a random period, and the regenerated cellulose multifilament yarn has an S rotation twist that corresponds to the autorotation twist of the thermoplastic synthetic filament yarn. , Z have tightly wound twists that are alternately reversed, and the two types of tight twists simultaneously form a crimped portion, which is a unique shape.

Moreover, although the composite yarn as a whole has substantial twist, and there is no substantial entanglement between both filament yarns, the bonding between both filament yarns is high, and the It is advantageous in processing.

However, the composite plate twisted yarn C4 produced by the method of the present invention has improved bulk, no longer has a plastic-like feel, and the bonding strength between the two types of filament yarns is high, which is advantageous for post-processing. In addition, woven and knitted fabrics have advanced properties such as having a moderate crispness that is preferred as clothing materials, good shape retention and moisture absorption, and moreover, the method of the present invention allows them to be stabilized in one step. production is possible.

Example 1 Viscose rayon yarn (75d/26f) and polyethylene terephthalate yarn (75d/36f) were subjected to composite plate twisting in the apparatus shown in FIG.

In the hollow tube nozzle 3, air of 2 K9/7 is blown from the tangential direction to generate a swirling flow in the S direction, and the roller 2
The excess supply rate between roller 4 and roller 4 was 8%.

The temperature of the heater 8 is 220°C, and the heating mechanism 9 uses a spindle that rotates 400,000 revolutions per minute in the Z direction.
The excess supply rate between 0 and 0 was set at 3%, and the cheese 5 was rolled at a speed of 108 m/min at the same speed as the roller 10.

The production was stable and there were no yarn breakages, and the composite plate twisted yarn produced had excellent bulkiness, as well as the suppleness and crispness characteristic of viscose rayon, giving it an excellent texture.

In addition, after applying drainage treatment to the obtained composite plate twisted yarn, 65%
The results of measuring the crimp elongation rate under an atmosphere of RH 120°C and an initial load of 30 g and a constant load of 150 g show a high value of 12.4%, indicating that sufficient crimp occurs after wastewater treatment. The thing has become clear.

On the other hand, the obtained composite processed material was knitted and the half-life was measured using a Honest meter to examine the charging property, and the half-life was 3.5 seconds.

As a comparison, the knitted fabric made of rayon yarn alone was 3.0 seconds, and the knitted fabric made of polyethylene terephthalate yarn alone was 6000 seconds or more.

Example 2 Cupra rayon yarn (50d/32f) and polyethylene telescrate yarn (75d/24f) were subjected to composite plate twisting force using the apparatus shown in FIG.

In the hollow tube nozzle 3, 3.25 Ky/ from the tangential direction
d air was blown in to generate a swirling flow, and the excess supply rate between rollers 2 and 4 was set to 25%.

The temperature of the heater 8 was set at 220° C., and the twisting mechanism 9 again used a swirling flow by blowing air of 3.25 to 9/Cl1r from the tangential direction.

The twist directions of Nos. 3 and 9 were the same. The excess supply rate between roller 4 and roller 10 was set to 10%, and the cheese was rolled up at 98 m/min at the same speed as roller 10.

The production was stable and there was no yarn breakage, and although the composite plate twisted yarn produced had no substantial twist as a whole, four of the yarns had alternating S and Z twists. The bond between the two types of filaments was high, and the system as a whole had a novel texture that felt compact.

Furthermore, when the crimp elongation rate and crimp recovery rate were measured according to the procedure described in Example 1, the results were 13.8% and 91%, respectively, indicating that the crimp in the ζ after wastewater treatment was sufficiently strong. I found out what happened.

[Brief explanation of drawings]

FIGS. 1 and 2 show an apparatus for imparting temporary elasticity to regenerated cellulose multifilament yarn, and FIG. 3 shows an example of an apparatus for producing composite plate twisted yarn according to the method of the present invention. 1... Regenerated cellulose multifilament thread, 2.4, 10... Roller, 3... Hollow tube nozzle, 5... Rolling cheese, 6...-
... Contact heater, 7 ... Thermoplastic synthetic filament yarn, 8 ... Heater, 9 ... Twisting machine tank, 11 ... Oiling.

Claims (1)

[Scope of Claims] 1. Regenerated cellulose multifilament yarn is used in the production of a composite plate twisted yarn consisting of thermoplastic synthetic filament yarn and regenerated cellulose multifilament yarn, which contains regenerated cellulose multifilament yarn in an amount of 10 to 80% by weight. After introducing the yarn into a hollow tube nozzle having a swirling fluid at an excess supply rate of 8 to 35 to impart elasticity,
1. A method for producing a composite plate twisted yarn, which comprises aligning the yarn with a thermoplastic synthetic filament yarn, guiding the two simultaneously to a hollow tube nozzle containing a swirling fluid, and subjecting them to a false twisting process. 2. The method according to claim 1, wherein the regenerated cellulose multifilament yarn is viscose rayon. 3. The method according to claim 1, wherein the thermoplastic synthetic filament yarn is polyethylene terecrate.