JPS628529B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention relates to a false-twisted crimped yarn, and more particularly to a false-twisted crimped yarn that has significantly improved cohesiveness and can be used as is (that is, without twisting or sizing) in a weaving process. Conventionally, in the weaving process of textiles using false twisted crimped yarn, it is essential to impart cohesiveness to the yarn, and for this reason, the intervention of complicated processes such as sizing and yarn twisting was unavoidable. . What led to the omission of these steps was the so-called interlacing process, which was usually carried out subsequent to the false twist and crimp process. This interlacing process itself
It has the advantage of being able to provide sufficient convergence in response to false twisting speeds, and has recently come into wide use.
However, the disadvantages of this process include the high cost of hydraulic air, the control of interlace nozzles (particularly the control of interlace quality within and between weights), and the false twisting process. Since it is a separate process, it cannot necessarily be said that it is the ultimate rationalization. In view of the above, the inventors have determined that the sizing,
As a result of various studies in order to obtain a false-twisted crimped yarn with improved cohesiveness without requiring operations independent of the false-twisting process, such as twisting or interlacing, we found that:
In the false twist crimp process, while the yarn rotates once,
We have discovered that by applying minute tension fluctuations and identifying the balloon state in the untwisting region, it is possible to obtain a focusing effect without any effect on the original workability. Thus, according to the present invention, a false twisted crimped yarn has the following converging portions a, b, and c intermittently along its longitudinal direction, and contains these in a mixed state. (a) A convergent portion in which a group of filaments twisted in the false twisting direction and a group of filaments twisted in the opposite direction are mixed together. (b) A bundled portion in which several filaments are twisted in the opposite direction to the false-twisting direction and wound around a bundle of filaments in an assembled state. (c) A converging section in which several filaments are twisted in the opposite direction to the false twisting direction around a filament bundle that is essentially untwisted. is provided. The present invention will be explained below with reference to the accompanying drawings. FIG. 1 shows a side view of the false twisted crimped yarn (Z false twist) of the present invention, particularly a side view of the converging portion _P1 in the yarn, and FIG. Of the focused part of c)
(a), Figure 1 (b) corresponds to Figure 1 (b), and Figure 1 (C) corresponds to (c). In Fig. 1A and Fig. 4 showing an enlarged side view thereof, filament groups f ₁ , f ₂ , f ₃ . ) with filament groups F ₁ , F ₂ , F ₃ …
…Fn mixes with each other, which causes the focused part
It is marked P ₁ . In FIG. 1B, the filament groups f ₁ , f ₂ . . . Filament for books (no more than 5 books)
F ₁ and F ₂ are twisted in opposite directions (S) to form a tightening structure. Furthermore, Fig. 1C shows filaments (f′, f″...
fn′) Several filaments F ₁ and F ₂ are wound around the bundle with twist (S) in the opposite direction to the false twisting direction, forming a converging part with a kind of winding structure, similar to (b). ing. A characteristic feature of Figures 1A to 1C is that in any converging section, some of the constituent filaments are twisted in the opposite direction to the false twisting direction, and the remaining filaments (untwisted or untwisted) This means that the twisted state) group is conjugated. Conventionally, a simple continuous untwisted structure of S and Z is known in false-twisted fused yarn, etc., but in the case of the present invention, the S and Z parts coexist in the same part without fusing, and this allows for focusing. It can be said that it is a new structure that is completely different from previous ones in that it forms a part. When the false twisted crimped yarn of the present invention is closely observed under a microscope, it is confirmed that any one or more of the convergent parts (a), (b), and (c) above exist intermittently. be done. Such focusing portions are typically 2 to 20 mm long and formed with gaps of 2 to 300 mm. A non-focused (spread) part P ₂ separates this focused part
The apparent thickness of the fibers is larger than that of the convergent part, and in this sense it can also be called the spread part.
It is noteworthy that there are many cases where there is slight entanglement between filaments. By the way, in the manufacturing process of such crimped yarns, in addition to minute tension fluctuations in the yarn in contact with the false twisting tool and slight destabilization of the twist grip, there is also a specific multiple balloon on the yarn after the false twisting tool. can be obtained by inducing An example of processing using a false twisting spindle will be described below. First of all, as a false twisting spindle, the yarn is twisted and
Adopt or use a twist pin such that the point at which it starts contacting the pin (Twist Pin) and the point at which it leaves the thread are not in the center of the pin. Second, a yarn guide is provided immediately after passing through the twist pin, and the yarn guide is set so that multiple balloons are generated between the pin and the guide. FIG. 2 is an explanatory diagram of the first requirement, in which the yarn 2 wound around the twist pin 1 is being false-twisted in a state where the contact start point and separation point to the pin are not at the center of the pin. Run. However, this state is unstable processing for the yarn, and the yarn slides on the pin along its axial direction within one rotation of the spindle, and the diagonal of the pin winding of the yarn also fluctuates. , resulting in tension fluctuations and twist grip spots. However, it is not possible to obtain the convergent portion as in the present invention with this alone, but it is preferable to form multiple balloons 5 as shown in FIG. 3 in order to further amplify the above-mentioned condition. Here, 3 is the false twisting spindle, 4 is the yarn guide, _l1 is the linear distance between the twist pin on the central axis of the spindle and the yarn guide, _l2 is the eccentric distance of the guide, and α is the bending angle of the yarn. The values of l ₁ and l ₂ above are 10 mm to 100 mm and 5 mm, respectively.
It may be selected within the range of mm to 35 mm so that α is 30° or less. Under these conditions, the bundled part can be made in the range of 10 pieces/80 cm to 50 pieces/80 cm, but generally the workability required for untwisted and glue-free interlace yarn is about 30 pieces/80 cm. Since the interlacing point of 80 cm is the lower limit, in the present invention, if you want to obtain a yarn comparable to this, l ₁ should be set to 35 mm to 100 mm.
It is preferable to select l ₂ so that it is within the range of , and the bending angle α is 25 or less. Incidentally, the values of l ₁ and l ₂ employed in normal false twisting and crimp processing are generally 3 mm to 5 mm for the former and 0 to 1 mm for the latter. In the present invention, when the above two conditions are satisfied, the reason why the convergent parts (a), (b), and (c) are formed is still not clear, but the twisting characteristics are further improved by the multiple balloons. It is presumed that the filament cracks due to the balloon as the filament becomes unstable and twist propagation unevenness occurs at the untwisted part, and this filament wraps around the remaining filament bundle. As is clear from the above explanation, the false twisted crimped yarn of the present invention is produced simultaneously in the false twisted crimped processing process without using any yarn focusing means such as interlacing or sizing. , in this sense, it has great significance. Moreover, as shown in the examples below, the converging part in the false-twisted crimped yarn has a converging effect, which corresponds to the "entanglement" part in the interlace yarn, so it is better than the conventional interlace yarn in terms of quality. We offer textiles that are comparable to those of the above. Example 1 A polyethylene terephthalate chip with an intrinsic viscosity of 0.64 was melted by a conventional method, extruded from a 36-hole die, wound at a speed of 3200 m/min, and heated at 115 de/min.
A medium oriented yarn of 36 fil was obtained. Using a modified version of the false twister LS-6 manufactured by Mitsubishi Heavy Industries, the yarn was threaded so that the contact start point and separation point of the yarn were not in the center of the twist pin.
Under processing temperature 190℃, stretching ratio 1.51, IN−
The results of DRAW false twisting are listed in Table 1.

[Table] Method for measuring the focusing part Take a sample length of 80 cm, stretch it by 3%, and then
Loosen the thread to a length of 60 cm, and count the converging parts in this state. This measurement is performed on five samples, and the average value is calculated. Example 2 In order to confirm the gathering workability of the No. 2 false twisted crimped yarn obtained in Example 1, it was used for warp and weft using a Nissan water jet loom LW41 type, and the loom rotation speed was 410 rpm. warp density 84/inch, weft density 73
I wove a plain cloth of 1/2. For comparison, No.
A similar fabric was obtained from the interlaced yarn having approximately 40 interlaces/80 cm by interlacing the processed yarn of No. 2. In this case, the results of the fuzz and yarn breakage of the warp yarns in the warping process, as well as the opening state during weaving and the number of times the loom was stopped are as shown in Table 2.

[Table] As is clear from Table 2, the false twisted crimped yarn of the present invention is comparable to interlaced yarn in terms of workability and handling.

[Brief explanation of the drawing]

Figures 1A to 3C are side views of the bundled part included in the false twisted crimped yarn of the present invention, Figure 2 is a front view showing the state in which the yarn is hooked to the twist pin, and Figure 3 is a side view of the bundled part included in the false twisted crimped yarn of the present invention. FIG. 4 is a front view showing the eccentric state of the yarn, and FIG. 4 is a partially enlarged side view of FIG. 1A. In Fig. 1, P ₁ ... focused portion, P ₂ ... spread portion, f ₁ - fn ... filament with twist in the false twist direction or untwisted filament, F ₁ - Fn ... filament with twist in the direction opposite to the false twist direction. A filament having a twist, in FIG. 2, 1... twist pin, 2... thread, in FIG. 3, 3... false twist spindle, 4... yarn guide, 5... multiple balloon, α... bending angle.

Claims (1)

[Scope of Claims] 1. A false-twisted crimped yarn having the following converging portions (a), (b) and (c) intermittently along its longitudinal direction, and containing these in a mixed state. (a) A bundle of filaments in which a group of filaments twisted in the false twisting direction and a group of filaments twisted in the opposite direction are mixed together. A bundled part (c) in which several filaments are twisted in the opposite direction to the false twisting direction around the bundle of filaments (c) A bundle of filaments in a substantially non-twisted state is surrounded by several filaments twisted in the opposite direction to the false twisting direction. Bundled portion 2 formed by winding The false twisted crimped yarn according to claim 1, wherein there are 30 bundled portions/80 cm or more. 3. The false twisted crimped yarn according to claim 1, wherein the bundled portion is in a non-fused state.