JPS58169533A - Shrinkable spun like processed 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 The present invention relates to a novel processed yarn in which stretchability is imparted to a spun-like false-twisted crimped processed yarn. More specifically, the present invention relates to an improvement of a two-layer structure yarn in which wound yarns are wound alternately around the circumference 9 of a core yarn in the form of twisted yarns.

Conventionally, alternately twisted two-layer structured yarns using false twisting have been produced by the following method.

Generally, when yarns of 21 m1 or more with different elongations are fed to the supply roller in a parallel manner and twisted using a false twisting spindle, the yarns with lower elongations are less likely to stretch, so they form the core of the yarn. However, since threads with high elongation are easy to stretch, they are threaded so as to surround the outer part of the thread.

When this twisted yarn state is heat-set and then untwisted, a two-layered crimped yarn is obtained in which the threads with low elongation become the core yarn, and the threads with high elongation surround it in an alternating twisted form. It will be done. (
Japanese Patent Publication No. 49-72443 2% Publication No. 49-4764
On the other hand, as another method for manufacturing the double-layered yarn having the above-mentioned configuration, a winding yarn is produced by using the rotating torque of the core yarn, which is twisted (false-twisted) in a state of 11AK, by a false-twisting spindle. It is also well known to overfeed and wind. (For example, see Japanese Patent Publication No. 45-28018.) In the two-layer structure yarn obtained by these methods,
In general, the wound yarn is wound around the core yarn in an alternating thread pattern, so its twist structure improves the sliminess and fluffiness that are the drawbacks of woolly processed yarn fabrics. I have one, but on the other hand, 1. It had the disadvantage of lacking the elasticity of ordinary woolly processed yarn.

During the manufacturing process of these conventional two-story spunlike textured yarns, the other yarn (wrapped yarn) under low tension wraps around the core yarn under high tension during false twisting, resulting in a tight bundle. Since it is covered, the conventional core yarn, which has a low crimp ability, does not develop crimp even after false twisting, and therefore, the processed yarn as a whole cannot exhibit stretchability due to crimp.

Therefore, even though such processed yarns may have a good spun-like texture, they have poor stretch properties when woven into fabrics, and when used in clothing, they can cause a feeling of tightness at the elbows and knees. This improvement is strongly desired especially in sports clothing. Conventionally, in order to compensate for the drawbacks of this double-layered yarn, it was mixed with stretchy woolly yarn, or
Nine types of so-called covering yarns, which are covered with spandex, are used.In these cases, 1. There are problems such as the spun-like texture of the two-layer yarn is reduced by half, and the price is high and labor is required.

According to research by the present inventors, in order to address this problem, in a two-layer wound yarn, even if the core yarn is bundled by the wound yarn and the core yarn is in good condition, it is necessary to It has become clear from the results of various studies that it is necessary for the crimping force of the yarn to overcome the tightening force of the wound yarn to cause crimping. A two-layer structure yarn whose core yarn is a side-pie-side type composite yarn made of polybutylene terephthalate polymer and polyethylene terephthalate polymer is used as a core yarn with a high crimp development force. In particular, the present inventor proposed in the specification of I# Application No. 17129/1983 that the material exhibits stretchability.

A double-layered yarn made of such a core yarn has elasticity comparable to that of ordinary woolly processed yarn, which is the purpose of the yarn production process, and in fact, a relatively thin fabric using this yarn exhibits a level of stretchability comparable to that of ordinary woolly processed yarn. However, when using thick fabrics with a denser structure, such as yarns used for jeans, slacks, etc., the resulting fabrics lack stretch, resulting in a feeling of tightness in the elbows and knees when worn. From this point of view, there is a strong desire for a yarn with more powerful stretch properties.

The present inventor has made extensive studies on a two-layered yarn that exhibits stronger stretchability and a spun-like texture as a yarn suitable for thick fabrics with excellent stretchability. As a result of step 7, as the core yarn of the two-layer yarn, the soft segment consists of polytetramethylene glycol component, and the hard segment consists of polybutylene glycol,
It has been found that a side-pie-side type composite yarn consisting of an elastomer consisting of a tallate component and a long-lasting butylene terephthalate is suitable, and the present invention has been achieved.

That is, the present invention provides a false twisted crimped yarn consisting of at least 42 kinds of filament yarns, in which one filament yarn is used as a core yarn, and the other filament yarn is wound around it. A part of the filaments forming the core are randomly mixed and intertwined with each other, while the crimped yarn as a whole is wound around the core yarn in an alternating manner. This is a stretchable spun-like processed yarn characterized in that it is composed of a side-by-side m-threaded yarn of an elastomer consisting of a polytetramethylene glycol component and a polybutylene terephthalate component, and a polybutylene terephthalate polymer.

Zero shot lJ! In the polybutylene terephthalate polymer, which is one of the components constituting the composite yarn used as the core yarn of the two-layer structure yarn, the main repeating sites are butylene terephthalate, and the other component, polybutylene terephthalate, is one of the components constituting the composite yarn. The elastomer consisting of a tetramethylene glycol component and a polybutylene terephthalate component has a molecular weight of 15
Polytetramethylene glycol to polybutylene terephthalate which is 00-2500 30/70-70
Preferably, block copolymerization is performed at a ratio of /3G.

In addition, the intrinsic viscosity of polybutylene terephthalate polymer [
η] is preferably 0.65 or more and 0.9 or less, and [η] of the elastomer comprising a polytetramethylene glycol component and a polybutylene terephthalate component is also preferably 0.9 or more and 1.8 or less. Within the above range, the larger the difference in [η] between these three, the better the stretchability. Further, the combined ratio of the three is preferably 3/7 to 7/3.

Furthermore, as a composite method, the side-pie-side type has good stretchability, but the J' eccentric sheath-core type also has a certain degree of stretchability.

Hereinafter, an example of obtaining a spunlike textured yarn of the present invention using the above-mentioned composite yarn will be explained with reference to the drawings.

In FIG. 1, the composite yarn (filament yarn) 1 and the polyethylene terephthalate filament yarn 2 having a higher elongation are combined by a guide 3 and then by a tension adjusting device 4. The yarn is fed through a feed roller 5 to an air injection nozzle 6 for cross-crossing and entangling, and is turned into an interlaced yarn having 30 or more entangled points per meter.

This intertwined yarn is then fed to the drawing false twisting zone by a first delivery roller 7 and heated to a heater 8. After passing through the false twisting tool 9 and being taken off from the second berry o-9-IOK, it is rolled up as cheese 11.

The processed yarn thus obtained is in the form of a two-layer yarn structure in which the composite yarn is arranged as the core yarn 12 and the polyethylene terephthalate yarn is arranged as the twisted yarn 13, as shown in FIG.

The important thing to note here is that the core yarn and the alternately twisted and wound yarn may separate from each other due to the repeated expansion and contraction of the core yarn of the processed yarn, and in practice they may form an interlayer. It is necessary to add #i entanglement between the threads to stabilize the thread structure. The interlacing treatment may be applied before the false twisting process or after the false twisting process, but in general, a more stable structure can be obtained by applying it before the false twisting process. Therefore, it is preferable.

The more entanglements imparted to the raw yarn, the better. Generally, when the entanglement treatment f is applied, the entangled portion and the Il1 portion repeat (-7 falcon position) to form an entangled yarn, but it is best to implement the present invention. In order to do this, it is best to apply entanglement such that the length of the entangled part is long < and the length of the gjAw part is short.It is best to apply entanglement uniformly to the entire yarn. However, from a practical point of view, the number of entanglements should be 40 or more, preferably 5 or more.
If it is more than m, a more preferable textured yarn can be obtained.

Note that the degree of entanglement can be measured as follows.

In other words, when the entangled raw yarn is floated in water in a container, the unentangled part opens to several times the thickness, and the entangled points do not open. Read the number of points visually.

Further, as the interlacing processing nozzle, an interlace processing nozzle is suitable, and a taslan nozzle can also be used. In the process, after interlace processing, simultaneous stretching and pre-combustion processing may be performed without first winding up. Preferably, the false twisting device is an external friction false twisting device using a spinner, which has the effect of feeding the paper, or a belt false twisting method.

The composite yarn of polybutylene terephthalate and elasanodomer made of a polytetramethylene glycol component and a polybutylene terephthalate component used for the core yarn in the processed VCsp described above preferably has an elongation of 80% or more, and the elongation is 60%. Good properties are obtained when simultaneous stretching and false twisting is carried out at a stretching ratio corresponding to ~so@. If the stretching ratio is too low, the elongation (stretchability) of the woven fabric will be poor, and if the stretching ratio is too low, processing stability will not be obtained and yarn breakage will occur easily.

On the other hand, the yarn used for the winding yarn is preferably polyethylene prephthalate, and its raw yarn elongation is 100% higher than the core yarn elongation.
It is necessary that it be larger than 9, preferably 1so1 or more.

The polymer used for the core yarn and wound yarn in the present invention may contain additives such as a matting agent, a coloring agent, and an S fuel agent. Polymerization, block copolymerization, or blending may also be used.

Furthermore, the shape of the filament breakage of the undrawn yarn and the partially oriented yarn, the amount of the E additive, etc. are not particularly limited. In this case, the denier of the undrawn yarn and the partially oriented yarn should be selected depending on the application, and generally the denier ratio of (wound yarn/core yarn) in the total denier should be 0.7 or more. Both attached thread and core thread denier are 50-3
00deJz is recommended, and the denier of the twisted yarn after processing is 3de or less, and the denier of the core yarn is #'i3d.
- Especially preferable texture and stretch properties can be obtained.

By combining the yarns as described above, it is possible to provide bulkiness, a soft surface feel, and resilience, as well as powerful stretch performance.

As described above, according to the present invention, appropriate twist texture,
An improved alternately twisted two-layer structure yarn is obtained that can provide a spun-like woven or knitted fabric that has fullness, flexibility, and also has strong al-stretch properties.

The present invention will be explained below with reference to Examples.

Example: An elastomer made by block copolymerizing polymethylene glycol with a molecular weight of 200o and polybutylene terephthalate at a weight ratio of 35/650, and with an intrinsic viscosity [η] of 1.4, and polybutylene with an [η] of 0.680. Composite spinning was performed in a side-by-side manner with terephthalate at a ratio of 5:5. The spinning speed at this time was 3500 m/min and 218 d.
・/48111, a partially oriented yarn POY with an elongation of 152% was obtained.

On the other hand, polyethylene terephthalate with [η] of 0.64 was spun at a spinning speed of 1400. / minute? 22Gte/72fi
t.

An undrawn yarn with an elongation of 345% was obtained.

These three yarns are aligned and twisted using the false twisting process shown in FIG.
is supplied to the interlace nozzle 6 for light mixing and entangling,
56 entanglements/m were applied at an overfeed rate of 1% and a compressed air pressure of 4 Kv'cdG, followed by a stretching ratio of 1.5.
Temperature of heater 8: 175°C, Is rubbing false twisting device 90, surface peripheral speed: 650 m, 7 minutes, second delivery roller 10
The sample was simultaneously stretched and false-twisted at a speed of 350 m/fin, and rolled up as Cheese 11.

The obtained processed yarn had a two-layer structure as shown in FIG.

Next, the stretchability of this processed yarn was evaluated by making it into the following plain woven fabric.

Root polyester 150d/48fij for warp,
1-Use 45 heater woolly processed yarns a2, insert the yarn to be considered into the weft, create a plain weave fabric with 65 mesh, and use normal relaxing, pre-sera) (180°C x 45 seconds), 13
It was subjected to a high pressure dyeing process at 0°C and a finishing process of 7 seconds (xsoc x 4s). Note that no finishing resin treatment was applied.

Take this plain woven fabric in the warp direction K 5 ('Il1 width, effective length 20 in the weft direction, put a weight of 1.5 Kp on it, and make the length after 1 minute 4. Further, remove the load and after 1 minute The recovered length 4 was measured, and the elongation rate 2 recovery rate was calculated using the following formula.

-20 The results obtained are shown in Table-1.

Comparative Example 1 Elongation 1 obtained by spinning polyethylene terephthalate with an intrinsic viscosity [η] of 0.63 at a spinning speed of 3500 m/min
The drawn Jf obtained by spinning 15% filaments of 225 de/30 fil and polyethylene terephthalate with [η] of 0.63 at a spinning speed of 1200 m/min.
3 II O'i ``t'' 225d@/72fit nofilaments were aligned and subjected to interlacing treatment and ground false twisting in the process shown in FIG. 1 under the same conditions as in the example.

The obtained processed yarn had a fine needle, double-layer structure yarn as shown in FIG. 2, similar to the example.

Next, the elasticity of this textured yarn was evaluated in the same manner as the actual example, and the results are also shown in Table 1.

Comparative Example 2 Polybutylene terephthalate having an intrinsic viscosity [η] of 0.78 and polyethylene terephthalate having an intrinsic viscosity [η] of 0.38 were spun at a ratio of 5:5 on a nide-by-side gel. The spinning speed at this time was 220 de/4 at 2500 m/min.
A partially oriented yarn poy having 8 fll and an elongation of 148 inches was obtained. On the other hand, polyethylene terephthalate with [η) = 0.64 was spun at 220 ds/72 fl at a spinning speed of 1400 m/min.
A Misagi drawn yarn with an elongation of 345 inches was obtained.

Next, the processed yarn obtained by performing the interlacing treatment and the ground false twisting process under the same conditions as in the example had a two-layer structure yarn having the side surface as shown in the second @. Next, the stretchability of this processed yarn was evaluated in the same manner as in the examples, and is also shown in Table IK.

Table 1 The effect of the side-pie-side type composite yarn of the present invention of the elastomer comprising a polytetramethylene glycol component and a polybutylene terephthalate component and polybutylene terephthalate is clearly recognized in the elongation rate and recovery rate. In addition, the texture was span-like.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram showing an embodiment of an apparatus for producing processed yarn of the present invention. No. 211I is an enlarged side view of the yarn structure of the processed yarn of the present invention. ], 2... Yarn; 3... Guide: 4... Tension &4
Sorting block; 5... Feed roller; 6... Interlace nozzle; 7... First delivery roller: 8.
... Heater; 9 ... False twisting device 11: 10 ... Second
Delivery roller; 11... Rolled cheese; 12...
- Core thread; 13... Thread with winding. % Applicant: Teijin Limited 2. - 1 Leather 1 Figure No. 21 ¥J

Claims (1)

[Claims] (1) A false twisted crimped yarn consisting of at least two types of filament yarns, in which one filament yarn is used as a core yarn and the other filament yarn is wound around it, in which one of the filaments constituting the wound yarn is The parts are randomly mixed with the core filament. The crimped yarn as a whole is a two-layered yarn that is wound around a core yarn in an alternately inverted manner, with the filaments that make up the core consisting of a polytetramethylene glycol component and a polybutylene terephthalate component. A stretchable spunlike processed yarn characterized by being composed of a side-by-side composite yarn of an elastomer and a polybutylene terephthalate polymer.