JPS6399344A - False twisted two-layered structural yarn and its production - Google Patents

Abstract

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

Description

[Detailed description of the invention] [Field to which the invention belongs] The present invention relates to a false-twisted two-layer structured yarn and a method for producing the same.

More specifically, the present invention particularly relates to a false-twisted two-layer structured yarn that utilizes an alternately twisted yarn-like winding structure and provides a refreshing feeling, and a method for producing the same.

[Prior art] Conventionally, two types of filaments were simultaneously false-twisted to produce a material with a refreshing feel, resulting in false-twisting 2 in which the sheath yarn was entangled with the core yarn.
There is a strong twisted yarn with a double layer structure, which is a layer structure yarn, in which the sheath yarn forms alternately single-wound portions and triple-wound portions around the core yarn (Special Publication No. 50-35147). Public bulletin). However, with this material, the triple-wound portion creates a poor design effect, making it unsuitable when a smart woven or knitted fabric is required.

Of course, in order to eliminate only the above-mentioned design effect, it would be sufficient to wrap the sheath yarn around the core yarn in a single layer, but the single-wrap yarn obtained by the conventional method The attachment structure is loose and the core yarn is exposed, which not only lacks a refreshing feeling but also makes it difficult to handle.

[Problems to be Solved] An object of the present invention is to provide a false-twisted two-layer structure strongly twisted yarn that does not have a substantial slab portion and has an emphasized refreshing feeling. A further object of the present invention is to provide a false-twisted two-layer structure strongly twisted yarn which does not substantially generate slabs due to triple winding and has an enhanced cool feeling.

[Solution] As a result of intensive research by the present inventors to achieve the above object,
In the manufacturing process of the double-layered false-twisted high-twisted yarn, which has traditionally been known to have alternating single and triple windings, by devising the yarn usage and winding conditions, only single winding is possible. It has been found that a material with substantially no exposed core yarn and therefore a desired cool feeling can be obtained.

Thus, according to the present invention, (1) in a core-sheath type two-layer structured yarn having an alternately twisted yarn-like winding structure obtained by simultaneously subjecting two or more thermoplastic yarns to a false twist-crimping process, a , the core yarn is a drawn yarn, and the sheath yarn is composed of an intermediately oriented yarn, b. the difference in the thread length of the sheath yarn with respect to the core yarn is 45% to 150%, c.
The sheath yarn does not substantially have a multiple winding structure around the core yarn, but is tightly wound around the core yarn in a single wrapping state. False-twisted two-layer structured yarn useful as a refreshing material, characterized in that #W or less, there is no substantial periodic change in twist density, and there is no unevenness in the thickness of the yarn as a whole, and the false-twisted yarn is useful as a refreshing material. In the crimping process, the yarn (core yarn) is being twisted during false twisting.
In supplying one turn of the sheath yarn to the core yarn through a sheath yarn insertion guide placed very close to the sheath yarn, (1) Using a drawn yarn as the core yarn and an intermediately oriented yarn as the sheath yarn, ) Supplying the sheath yarn with an overfeed of 45% to 150% to the core yarn, (g) Establishing the relationship between the winding start point of the sheath yarn around the core yarn and the point at which the sheath yarn leaves the sheath yarn insertion guide. The straight line distance is 5 mm or less, and (iv) the sheath thread is 45 mm from the core thread in the direction of movement of the core thread.
Provided is a method for producing a false-twisted two-layer structured yarn useful as a refreshing material, characterized in that the yarn is fed at an angle of 0 or less.

The present invention will be described in detail below with reference to the accompanying drawings.

FIG. 1 is a side view of a false twisted two-layer structured yarn according to the present invention, in which 1 is a core yarn made of, for example, drawn polyester yarn (FOY), and 2 is a sheath yarn made of polyester intermediately oriented yarn (POY). The sheath yarn is wound around the core yarn in an alternating/twisted manner with a fine pitch, and the processed yarn as a whole exhibits a core-sheath type structure.

One of the characteristics is that the sheath thread has a large thread difference of 45% to 150%. It is said that the longer the thread difference, the less irritating the POY-FOY feeling and the greater the refreshing feeling.

In FIG. 1, the sheath yarn 2 is tightly wound around the core yarn 1 as shown in the figure, and is wound in a single winding structure in alternating twists.
3m winding (spiral winding) as seen in Q bulletin
does not exist. Moreover, regarding the winding state, the twist reversal period P (that is, the distance between adjacent reversal points) is extremely short, less than 3 mrtr, preferably 0.11 nbm, and although there are uneven thicknesses in small parts, the yarn as a whole is thick. It is characterized by its lack of spots, which means it has no design effect.

Here, the term "tight state" means that the sheath thread is tightly wrapped around the core thread, and as a result, the core thread is not substantially exposed (usually, the length of the exposed part of the core thread is 0.0% per iocm of processed yarn.
5# I11 and below) say something.

In addition, it is preferable that the sheath thread as a whole is in a non-fused state, but if there are scattered locations in the cross section of the sheath thread where several filaments are fused, this may occur in combination with the above-mentioned tightened state. Therefore, the cohesiveness and handling properties of the processed yarn as a whole are significantly improved.

Next, a method for manufacturing such a false-twisted two-layer yarn will be described. The core yarn 1 is taken out from the barn 3 via a guide 4, is supplied from a supply roller 5 to a false twisting zone, and assumes a false Wi turning state between the supply roller 5 and a false twister 6. On the other hand,
After the sheath thread 2 is taken out from the cheese 7 via the guide 4,
It is wound into the core yarn 1 during false twisting via the sheath yarn insertion guide 8.

Next, both yarns in this wound state are heat-set by a heater 9, untwisted by a false twister 6, passed through a take-up roller 10, and wound onto a bobbin 11. FIG. 3 is an enlarged view showing the state in which the sheath yarn 2 is wound around the core yarn during false twisting, and in particular, the winding start point 12 of the sheath yarn 2 around the core yarn 1 and the separation point 13 of the sheath yarn from the guide 8. Keep the straight line distance to 5M or less and the supply angle α to 45
It is to be maintained below 0.

In such a process, the core yarn 1 is a drawn polyester yarn with a birefringence of at least 0.07, preferably 0.10 or more, and the sheath yarn is a drawn polyester yarn with a birefringence of 0.02 to 0.0.
06 polyester intermediate oriented yarn is preferably used.

The sheath yarn 2 is supplied with an overfeed of 45% to 150% relative to the core yarn 1.

Further, the surface temperature of the heater 9 is preferably set to a high temperature as long as the sheath threads 2 are not fused together, or as mentioned above, a temperature at which some degree of fusion occurs within the cross section. For this purpose, depending on the birefringence of the sheath yarn, a temperature between 200 and 240°C (the most suitable is between 230°C and
240° C.), and is set appropriately according to the processing speed.

[Function/Effect] A. False-twisted two-layer structure yarn In order to obtain a material with a refreshing feel using a structure other than fusing the entire yarn, the present invention uses a tight and evenly wound structure with a twist reversal period of 3 m or less. It changes at such minute intervals.

Here, it is necessary that the winding structure is substantially single winding. On the other hand, when triple or more wrapping structures are mixed together, the design effect becomes stronger and the material deviates from the idea of the present invention, which is a smart and refreshing material.

By the way, the feature of the present invention is that the yarn length difference between the sheath yarn and the core yarn is 45.
%~150%, the sheath yarn exhibits a tight single winding, but this is due to the use of an intermediately oriented yarn with a high heat shrinkage rate and a low Young's modulus as the sheath yarn. by. In other words, the intermediately oriented yarn (sheath yarn) wrapped around the core yarn easily shrinks on the false twisting heater, and as a result, the tightening force against the core yarn increases, and when it passes through the false twister in this state, it will partially reverse. This results in reverse twisting. In this case, if the Young's modulus is low, it will be tightly wound. When viewed as a two-layer tip metal body, there are no periodic changes in twist density or visual unevenness in thickness, so the thread as a whole is a material with a uniform quality and no rough or hard feeling.

B. Manufacturing method As mentioned above, the present invention is directed to a two-layer yarn with a tight single-layer winding and an extremely short winding reversal period.

In this sense, the point of the manufacturing method depends on how to increase the winding density of the sheath yarn and how to wrap the sheath yarn in a single layer. In this regard, in the present invention, first, the above-mentioned date (Fig. 3) is
#1 I11 or less, 2 mm or less in very good condition, α 450 or less to always maintain the winding start point of the core yarn around the sheath yarn at a constant position. Overfeed amount of sheath yarn is 45
Single winding in a high range of % to 150% is possible.

This wrapped state is then heat-fixed by the heater 9, but at this time, since the sheath thread 2 is an intermediately oriented thread that easily shrinks due to heat, it easily contracts on the heater 9, forming a tightly wound state. It is then heat-set. When the winding structure heat-fixed in this way is untwisted using the false twisting tool 6, an extremely short twisting (winding) reversal period P of 3 twists or less can be obtained.

[Example] Example 1 A two-layer structured yarn was obtained using the following yarn usage and processing conditions in the steps shown in FIGS. 2 and 3.

■, Thread usage/core thread 1...Polyester drawn thread 50de/24f
i I (birefringence index 0.11) ・Sheath yarn...Polyester intermediate oriented yarn 78de/36
f i I (birefringence 0.035) ■, Processing conditions/Surface speed of supply roller 5...75 m/mi
n・Surface speed of supply roller 5′・136 m/min・
Surface speed of take-up roller 1゛0...80m/m
Overfeed amount of sheath yarn to in/core yarn...9
0% ・False twisting spindle, rotation speed...340,000 rpm
・Heater temperature: 235℃ ・Sheath thread insertion guide: 21M diameter ceramic kite ・Polishing: 235°C ...
- 3.5 and 8 #II [, two-layer structure yarn properties as shown in Figure 1 below.

Table 1 Comparative Example 1 The same operations as in Example 1 were performed except that the overfeed of the sheath yarn with respect to the core yarn was changed to 40%. It was twisted, had an irritated appearance, and had a touch that was far from refreshing.

[Brief explanation of the drawing]

Fig. 1 is a side view of the false twisted two-layer structured yarn of the present invention, Fig. 2 is a route diagram of the manufacturing process of the false twisted two-layer structured yarn of the present invention, and Fig. 3 is the state of supply of the sheath yarn to the core yarn. This is a route map showing. In Fig. 1, 1... Core thread 2... Sheath thread P... Winding reversal cycle In Fig. 2, 8... Sheath thread insertion guide 9... Heater 6... False twisting tool In FIG. 3, 12...The winding start point of the sheath thread 13...The separation point of the sheath thread from the guide α...The supply angle of the sheath thread with respect to the core thread. Patent Applicant: Teijin Processed Thread Co., Ltd. Representative Patent Attorney 1) Pure Figure 1 □ Figure 2

Claims (12)

[Claims] (1) In a core-sheath type two-layer structured yarn having an alternately twisted yarn-like winding structure obtained by simultaneously false-twisting and crimping two or more thermoplastic yarns, a, the core yarn is a drawn yarn. The sheath yarn is composed of intermediately oriented yarns, b. The difference in the thread length of the sheath yarn with respect to the core yarn is 45% to 150%, c.
, the sheath thread is tightly wound around the core thread in a single wrapping state without substantially forming a multiple winding structure around the core thread; A false-twisted two-layer structured yarn useful as a refreshing material, which is characterized by the following: and the yarn as a whole has no unevenness in thickness like a design yarn. (2) The false twisted two-layer structured yarn according to claim (1), wherein the core yarn is a polyester filament yarn with a birefringence index of 0.07 or more. (3) Claim No. 1 in which the sheath yarn is a polyester intermediately oriented filament yarn with a birefringence index of 0.02 to 0.06.
) False-twisted two-layer structured yarn. (4) The false twisted two-layer structured yarn according to claim (1), wherein the yarn foot difference is 70% to 150%. (5) Weight ratio of sheath yarn to core yarn is 1.13 to 1.35
The false twisted two-layer structured yarn according to item (1). (6) The denier of the sheath yarn is 0.5 to 1.
The false twisted two-layer structured yarn according to claim (1), which is 5 times as large. (7) The false twisted two-layer structured yarn according to claim (1), wherein the twist reversal period is 0.1 mm to 1 mm. (8) In the false twisting and crimp process, when supplying and winding the sheath yarn around the core yarn through the sheath yarn insertion guide placed very close to the yarn (core yarn) that is being falsely twisted and turned. (i) using a drawn yarn as the core yarn and an intermediately oriented yarn as the sheath yarn; (ii) supplying the sheath yarn with respect to the core yarn under an overfeed of 45% to 150%; (iii) using the sheath yarn as an overfeed. The straight distance between the starting point of winding around the core thread and the point at which the sheath thread leaves the sheath thread insertion guide is 5 mm or less;
A method for producing a false-twisted two-layer structured yarn useful as a refreshing material, characterized by supplying it at the following angle. (9) The false twisted two-layer structured yarn according to claim (8), wherein the core yarn is a polyester filament yarn with a birefringence index of 0.07 or more. (10) The sheath yarn is a polyester intermediately oriented filament yarn with a birefringence index of 0.02 to 0.06.
The false twisted two-layer structured yarn described in item 8). (11) The false twisted two-layer structured yarn according to claim (8), wherein the yarn foot difference is 40% to 150%. (12) The method for producing a false-twisted two-layer structured yarn according to claim (8), wherein the core yarn is processed to have a twist coefficient of 0.8 to 1.10.