JPH0615732B2 - Method for producing false twist two-layer structure yarn - Google Patents

Description

Description: FIELD OF THE INVENTION The present invention relates to a method for producing false twist two-layer structure yarn. More specifically, the present invention particularly relates to a false twist two-layer structure yarn and a method for producing the same, which utilizes an alternating twisted yarn single winding structure.

[Prior Art] Conventionally, false twisting 2 in which a sheath yarn is entangled with a core yarn by simultaneously false twisting two types of filaments as materials having a refreshing feeling
A false-twisted two-layer structure strong twist yarn in which a sheath yarn is formed by alternately forming a single-wound portion and a triple-wound portion with respect to a core yarn is known (Japanese Patent Publication No. Sho 50- 35147 publication). However, this material is not suitable for plain woven and knitted fabrics because the triple wound portion has a design effect. Of course, in order to eliminate only the above design effect, the sheath yarn may be wound around the core yarn with respect to the sheath yarn in a single winding. The attached structure was loose and the exposed core yarn was conspicuous.

[Problems to be Solved] An object of the present invention is to provide a method for producing a false-twisted two-layer structured yarn in which there is no substantial slab portion, only single winding is performed, and the core yarn is not exposed and a refreshing feeling is emphasized. Especially.

[Solution] As a result of intensive studies conducted by the present inventors to achieve the above object,
In the process of manufacturing a false-twisted two-layer structure (strong twist) yarn in which single-winding and triple-winding are alternately known, the single-winding is achieved by devising the usage and winding state of the yarn. It was clarified that the core yarn was not exposed substantially by itself and thus a material having a desired refreshing feeling was obtained.

Thus, according to the present invention, in the false twist crimping process, the sheath yarn is supplied and wound around the core yarn through the sheath yarn insertion guide which is arranged in close proximity to the yarn (core yarn) which is being temporarily wound. When attached, (i) a drawn yarn is used as the core yarn, an intermediate oriented yarn is used as the sheath yarn, and (ii) the sheath yarn is supplied to the core yarn under an overfeed of 45% to 150%, (iii) ) The straight line distance between the winding start point of the sheath yarn around the core yarn and the detachment point of the sheath yarn from the sheath yarn insertion guide is less than 3 mm, and (iv) the sheath yarn from the traveling direction of the core yarn with respect to the core yarn. A method for producing a false-twisted two-layer structure yarn in which a sheath yarn is wound around a core yarn substantially only in a single winding state and the core yarn is not exposed, characterized in that the yarn is supplied at an angle of 45 ° or less. It

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.
FIG. 1 is a side view of a false twist two-layer structure yarn obtained by the method of the present invention, and FIG. 2 is a manufacturing process diagram thereof.

First, in FIG. 2, the core yarn 1 is moved from the pan 3 to the guide 4
And is supplied from the supply roller 5 to the false twist zone, and a false twist turning state is established between the supply roller 5 and the false twist tool 6. On the other hand, the sheath yarn 2 is taken out from the cheese 7 via the guide 4, and then wound around the core yarn 1 in the false twist rotation via the sheath yarn insertion guide 8. Next, the two yarns in the wound state are heat-fixed by the heater 9 and then untwisted by the false twisting tool 6,
The take-up roller 10 is wound around the 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. Particularly, the winding start point 12 of the sheath yarn 2 around the core yarn 1 and the detachment point 13 of the sheath yarn from the guide 8 are shown. The linear distance l with
Further, the supply angle α is maintained at 45 ° or less.

In such a process, the core yarn 1 has a birefringence index of at least 0.07, preferably a stretched yarn of polyester of 0.10 or more,
As the sheath yarn, a polyester intermediate oriented yarn having a birefringence of 0.02 to 0.06 is preferably used. Then, the sheath yarn 2 is supplied under an overfeed of 45% to 150% with respect to the core yarn 1. The surface temperature of the heater 9 is preferably a high temperature as long as the sheath yarn 2 is not fused or a temperature at which some fusion occurs in the cross section as described above. For this purpose, depending on the birefringence of the sheath yarn, between 200 and 240 ° C (most suitable between 230 ° C and
240 ℃) and set appropriately according to the processing speed.

FIG. 1 is a side view of the false-twisted two-layer structure yarn thus obtained, in which 1 is a core yarn, 2 is a sheath yarn, and the sheath yarn is in the form of an alternate twisted yarn with a fine pitch around the core yarn. The wound and textured yarn as a whole has a core-sheath type structure. One of the features is that the difference in the leg length of the sheath yarn is as large as 45% to 150%. The longer the thread difference, the less the irritability of POY / FOY, and the more the refreshing feeling.

In FIG. 1, the sheath yarn 2 is a core yarn 1 as shown.
There is no triple winding (spiral winding) as seen in Japanese Patent Publication No. 50-35147, for example, in a tightly wound state and with a single winding structure in which it is wound in an alternate twisted yarn shape. Moreover, regarding the winding state, the twist inversion period P (that is, the distance between adjacent inversion points) is 3 mm or less, preferably 0.
The feature is that the yarn is extremely short as 1 mm to 1 mm, and there is thickness unevenness in a minute portion, but the yarn as a whole has no thickness unevenness, that is, no design effect.

Here, the "tightening state" means that the sheath yarn is wound in a state where the core yarn is tightly tightened, and as a result, the core yarn is not substantially exposed (usually, the length of the exposed portion of the core yarn is 0.5 mm per 10 cm of processed yarn).

In addition, the sheath yarn is preferably in a non-fused state as a whole yarn, but when there are scattered portions where fusion occurs between several filaments in the cross section of the sheath yarn, the sheath yarn and the above-mentioned tightened state are associated with each other. Therefore, the bundleability and handleability of the entire processed yarn are significantly improved.

[Operation / Effect] As described above, the present invention intends to obtain a two-layer structured yarn which is tightly wound in a single winding and has a very short winding reversal period. From this point of view, the point of the manufacturing method depends on how to increase the winding density of the sheath yarn and to wind the sheath yarn in a single layer. In this regard, in the present invention, first, the above l (third
(Fig.) Is 3 mm or less and α is 45 ° or less, so that the winding start point of the core yarn with respect to the sheath yarn is always held at a fixed position. Then, in such a state, single winding can be performed in a high range where the overfeed amount of the sheath yarn with respect to the core yarn is as high as 45% to 150%. This wound state is subsequently heat-fixed by the heater 9, but at this time, the sheath yarn 2 is an intermediate oriented yarn that easily undergoes heat shrinkage, so the heater 9
It shrinks easily on the top and is heat set while forming a tightly wound state. When the heat-fixed winding structure is untwisted by the false twisting tool 6, an extremely short twisting (winding) reversal period P of 3 mm or less is obtained.

The false-twisted two-layer structured yarn thus obtained is one in which the sheath yarn is wound around the core yarn substantially in a single winding state, and the core yarn is not exposed. And the difference between the sheath yarn and the core yarn is
Despite being as high as 45% to 150%, the sheath yarn exhibits a series of tight windings. This sheath yarn has an intermediate oriented yarn with high heat shrinkage and low Young's modulus. It depends. In other words, the intermediate orientation yarn (sheath yarn) wound around the core yarn easily contracts on the false twist heater, resulting in an increase in the tightening force for the core yarn. And reverse twist. In this case, if the Young's modulus is low, it winds tightly. In the case of the entire two-layer structure yarn, there is no periodical change in twist density and no visual unevenness in thickness, so that the yarn as a whole is a material having no proportion (quality) and no feeling of coarseness.

[Example] Example 1 A two-layer structured yarn was obtained under the processing conditions using the following yarns in the steps of Figs. 2 and 3.

I. Thread usage-Core yarn 1 ... Polyester stretched yarn 50de / 24fil (birefringence
0.11) ・ Sheath yarn ... Polyester intermediate oriented yarn 78de / 36fil (birefringence 0.035) II. Processing conditions-Surface speed of supply roller 5 75 m / min-Surface speed of supply roller 5'136 m / min-Surface speed of take-up roller 10 80 m / min-Overfeed amount of sheath yarn to core yarn 90%- False twisting tool False twisting spindle, rotation speed… 340,000 rpm ・ Heater temperature… 235 ℃ ・ Sheath thread insertion guide… 2mm diameter ceramic guide ・ l …… 1, 3, 5 and 100mm ・ Feed angle α …… 45 ° III. Two-layer structure yarn properties As shown in Table 1 below, the overfeed amount is 90%.
By setting l to 3 mm or less and the supply angle α to 45 ° or less, the winding start point of the sheath yarn with respect to the core yarn is always held at a constant position, and as a result, the sheath yarn (intermediate oriented yarn) ), The Young's modulus is low and the heat shrinkage rate is high, so that a "single winding state" single winding structure is obtained.

Comparative Example 1 When the same operation as in Example 1 was carried out except that the overfeed amount of the sheath yarn with respect to the core yarn was changed to 40% in Example 1, the obtained processed yarn as a whole had loose alternating twists. However, the appearance was irritating, and the touch was far from a refreshing feeling.

Example 2 In Example 1, l was 3 mm, the supply angle α was 35 °, 40 °,
The same operation was performed except that the angle was 50 ° and 55 °.

The properties of the obtained two-layer structured yarn are as shown in Table 2 below, and it can be seen that the desired two-layer structured yarn is obtained when l ≦ 3 mm and α ≦ 45 ° are simultaneously satisfied.

[Brief description of drawings]

FIG. 1 is a side view of a false twist two-layer structure yarn obtained by the method of the present invention, FIG. 2 is a schematic diagram of a manufacturing process of the false twist two-layer structure yarn, and FIG. 3 is a sheath yarn for a core yarn. FIG. 3 is a schematic diagram showing a supply state of the above. In Fig. 1, 1 ... core yarn 2 ... sheath yarn P ... winding reversal cycle 8 in Fig. 8 ... sheath yarn insertion guide 9 ... heater 6 ... false twisting tool Fig. 3 12 ... … Sheath yarn winding start point 13 …… Sheath yarn separation point from the guide α …… Supply angle of the sheath yarn with respect to the core yarn.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Masashi Hirota 4-18 Yamada Higashi, Suita City, Osaka Prefecture B504 (72) Inventor Kenji Kawakami 4-2 Kamishi City, Kashiwara City, Osaka Prefecture (56) References JP-A-50-13652 (JP, A) JP-A-50-20062 (JP, A) JP-A-58-91839 (JP, A) JP-A-56-107033 (JP, A)

Claims (1)

[Claims] 1. In a false twist crimping step, a sheath yarn is fed and wound around the core yarn through a sheath yarn insertion guide arranged in close proximity to a yarn (core yarn) which is in the course of false twist rotation. (I) a drawn yarn is used as the core yarn, an intermediate oriented yarn is used as the sheath yarn, (ii) the sheath yarn is fed under an overfeed of 45% to 150% with respect to the core yarn, and (iii) the sheath The straight line distance between the winding start point of the yarn around the core yarn and the detachment point of the sheath yarn from the sheath yarn insertion guide is 3 mm or less, and (iv) the sheath yarn is 45 ° with respect to the core yarn from the traveling direction of the core yarn. A method for producing a false-twisted two-layer structure yarn, in which the sheath yarn is supplied at the following angles, and the sheath yarn is wound around the core yarn substantially only in a single winding state, and the core yarn is not exposed.