JPH0429772B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention relates to a stretching device for synthetic fiber bundles, and in particular, it can draw synthetic fiber bundles with a fineness of several thousand to several million deniers uniformly without the trouble of winding or cutting them with rollers, maintaining a stable stretching condition. The present invention relates to an extremely excellent stretching device that can orient the fibers. Conventionally, as a drawing device for synthetic fiber bundles, a heated gas bath or
Stretching apparatuses are known which are provided with heated liquid baths. However, when using a device equipped with a heated gas bath, it becomes difficult to uniformly supply heat to each single fiber as the synthetic fiber bundle becomes thicker. flowing,
This has the disadvantage that the heating start point fluctuates, resulting in a significant deterioration of product quality. In addition, in devices equipped with a heated liquid bath, it is necessary to provide a space between the final supply roller and the heated liquid bath for the overflow of the heated liquid, and the synthetic fiber bundle cannot be brought too close to the supply roller. If the temperature is increased, the drawing point will move to the supply roller side and come out of the bath, which is a drawback.
If the drawing point is outside the bath, the drawing condition becomes unstable, leading to breakage of the drawn yarn and mixing of undrawn yarn, making it impossible to increase the drawing ratio and making it impossible to obtain a high-quality product. Furthermore, in order to prevent yarn breakage and mixing of undrawn yarn and increase the drawing ratio, attempts were made to immerse the supply roller itself in a heated liquid bath so that the drawing point was present in the bath, but the drawing ratio When the temperature becomes high, the drawing point comes out from the bath surface on the roller and moves to the supply roller in front, which causes the drawing condition to become unstable. The present invention solves the above-mentioned drawbacks of the prior art and provides a synthetic fiber bundle stretching apparatus that can achieve high-magnification and high-speed stretching with good stretching conditions. That is, the present invention applies heating liquid to a synthetic fiber bundle between a supply roller group and a stretching roller group, and in a device for stretching the synthetic fiber bundle, the synthetic fiber bundle is synthesized from above from the last roller of the supply roller group. A concave bath is provided in which heated liquid is ejected toward the part where the fiber bundle leaves the final roller, and the synthetic fiber bundle is temporarily immersed in the ejected heated liquid. The gist of the present invention is a synthetic fiber bundle stretching apparatus characterized in that it is disposed directly below the final roller. Hereinafter, the apparatus of the present invention will be explained in detail based on the drawings. Fig. 1 is a side view of the device of the present invention, Fig. 2 is an enlarged perspective view of only a part of the device in Fig. 1, and Figs. 3 and 4 are perspective views of examples of its application. . The synthetic fiber bundle 1 is stretched between supply roller groups 2 to 6 and stretching roller groups 7 to 11, which rotate at a peripheral speed farther than the supply roller groups, according to the peripheral speed ratio. 12 is a heated liquid jetting nozzle, and 13 is a concave immersion bath. The heated liquid is ejected from the ejection nozzle 12 and sprayed onto the synthetic fiber bundle 1 coming out from the supply roller 6.
The heated liquid splashed onto the synthetic fiber bundle 1 temporarily immerses the synthetic fiber bundle 1 in the dipping bath 13 and flows out both in the direction of the supply roller 6 and in the direction of the stretching roller 7 . The immersion bath 13 is provided as close to the supply roller 6 as possible so that the heated liquid flowing in the direction of the supply roller 6 is immersed up to the synthetic fiber bundle directly below the supply roller 6. As shown in FIG. 2, the jet nozzle is divided into a plurality of small holes 14 so as to uniformly jet the heated liquid onto the synthetic fiber bundle 1. As shown in FIG. 3, by providing a plate 15 attached to the jet nozzle, the synthetic fiber bundle can be more uniformly sprayed with the heated liquid. As shown in FIG. 4, a plurality of heated liquid jetting nozzles 16 are provided at the bottom of the immersion bath 13, and heated liquid is jetted from the immersion bath 13 from both upper and lower surfaces of the synthetic fiber bundle 1. It becomes more uniform. The length of the immersion bath 13 ranges from 10 to 200 cm. When the length of the immersion bath 13 becomes long, it is desirable to provide a plurality of jet nozzles 12 and a plurality of jet nozzles 16 in the immersion bath 13 in the length direction of the synthetic fiber bundle. The heated liquid flowing out from the immersion bath 13 is recovered by a recovery bath 17 provided at the bottom of the bath 13 and a nip roller 18 for squeezing the heated liquid, and then the insufficient liquid is replenished and heated to a predetermined temperature. hand,
By using equipment that circulates the water so that it is ejected again from the ejection nozzle 12, it is advantageous because it saves energy. As the heating liquid, hot water at 60 to 100° C. or a solution of an antistatic agent or an oil agent used for the purpose of improving convergence, smoothness, etc. can be used. The drawing apparatus of the present invention is extremely useful for drawing synthetic fiber bundles such as polyester, polyamide, polyacrylonitrile, and polyolefin. By using the drawing device of the present invention, it is possible to draw a high-denier synthetic fiber bundle, and even when the drawing speed is increased, there is no problem of roller wrapping or yarn breakage, the drawing condition is good, and the fiber structure has a high degree of orientation. A dense, high-quality product is obtained. The present invention will be explained in more detail with reference to Examples below. Example Polyethylene terephthalate having an intrinsic viscosity (measured at 25°C using a mixed solvent of equal weights of phenol and tetrachloroethane) of 0.65 was melt-spun using a conventional method to obtain an undrawn fiber bundle of approximately 1.5 million deniers. Using the stretching device shown in Figure 1, the stretching speed was varied as shown in Table 1, and the stretching ratio was kept constant.
It was stretched 3.2 times. Warm water was used as the heating liquid. The heating bath used was one having the shape shown in Fig. 4. Temperature of heating liquid is 80℃, immersion bath 13
The length was 50cm. The flow rate of the heated liquid jetted from the jet nozzle 12 was 30/min, and the flow rate of the jet nozzle 16 of the immersion bath 13 was 20/min. Table 1 shows the yarn quality and stretching condition (presence or absence of yarn breakage and roller winding) of the drawn yarn obtained by drawing.

[Table] Single yarn fineness of drawn yarn is 1.5d, strength is 6.0~6.1
g/d and elongation of 30.2 to 31.8%, which were the target values, were obtained, and the yarn was extremely excellent, with no yarn breakage or twisting during stretching.

[Brief explanation of drawings]

FIG. 1 is a side view of the stretching apparatus of the present invention, FIG. 2 is an enlarged perspective view of the main part of FIG. 1, and FIGS. 3 and 4 are perspective views of examples of its application. 1... Synthetic fiber bundle, 2-6... Supply roller, 7
~11... Stretching roller, 12... Heated liquid jet nozzle, 13... Immersion bath, 14... Small hole, 15...
Plate, 16...Ejection nozzle, 17...Recovery bath, 18
...Nitsprora.

Claims (1)

[Claims] 1. In an apparatus for stretching a synthetic fiber bundle by applying a heated liquid to a synthetic fiber bundle between a supply roller group and a stretching roller group, a heating liquid is applied to the synthetic fiber bundle from the last roller of the supply roller group. A concave immersion bath is provided in which heated liquid is ejected from the direction toward the part where the synthetic fiber bundle leaves the final roller, and the synthetic fiber bundle is temporarily immersed in the ejected heated liquid, A synthetic fiber bundle drawing apparatus characterized in that the tip of the immersion bath is placed directly below the final roller. 2. The synthetic fiber bundle stretching apparatus according to claim 1, wherein the heated liquid is spouted from the bottom of the concave bath.