JPS6027621B2 - How to store tow - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for storing tow drawn at high speed into a can.

Recently, synthetic fiber tows of 100 h/min or more (especially 20 h/min)
00 to 400 h/min), the toe is discharged into the atmosphere along with a gas flow from the tip of a curved passage provided in the rotating body to form a coil, and the coiled toe is drawn downward. Attempts have been made to store the cans in a can by allowing the tow to fall and accumulate in a can placed at It has also been proposed that air be ejected to form an air curtain.

However, when tow is collected using this method, the coil diameter of the tow deposited in the can gradually becomes smaller as the tow accumulates from the beginning of can collection, and the longitudinal cross-sectional shape of the tow deposited in the can changes from the bottom. It has a trapezoidal shape that tapers toward the top.

For this reason, a gap is created between the inner wall of the can and the accumulated tow or between the accumulated tow, and a portion of the tow gets into this gap, causing an extremely poor creel performance in the next process. As a result of research aimed at solving such problems, the present inventors have obtained a new finding that the coil diameter of the tow falling into the can can be adjusted by the amount of air in the air curtain.

The present invention is based on this new knowledge, and the amount of air in the air curtain is reduced by the rise of the upper surface of the accumulated tow in the can.
That is, by gradually increasing the coil diameter as the falling distance of the tow decreases, the tow is deposited and collected with a uniform coil diameter from the bottom to the top of the can.
Hereinafter, the present invention will be explained in detail with reference to the drawings. FIG. 1 is a schematic diagram showing one embodiment of the present invention, where Y is a running toe;
1 and 2 are nip rollers, 3 is an ejector, and 4 is a rotating body that rotates at high speed in the direction of the arrow. A curved toe passage is provided inside the rotating body, and the tip of the toe passage 5 is formed on the circumferential surface of the rotating body. It is opened to form a discharge port 6. 7 is rotating body 4
A slit for forming an air curtain surrounding the coil by injecting gas downward from the periphery in a layered manner, 8 is a cylindrical can that accommodates the tow, and the can 8 rotates at a constant speed in the direction of the arrow. ing.

Moreover, the broken line T and the dashed-dotted line T2 are lines each showing the outline of the tow deposit. Generally, 100 h/min or more (
In particular, one that was picked up at a high speed of 2000 to 400 h/min)
The ~100,000 denier tow is a pair of Nitsu rollers,
2, is sent from the ejector 3 with a high-speed gas flow into the curved tow passage 5 in the rotating body 4, and is discharged from the discharge port 6 at the tip into the atmosphere together with the gas flow to form a coil as shown in the figure. The coiled tow falls downward through a space surrounded by an air curtain of gas ejected from the slit 7 and is deposited in the can 8.

In addition, when the can 8 is large, the can is rotated as shown in the figure or swung back and forth and left and right so that the toe is evenly deposited inside the can. At this time, if the can storage conditions are kept constant, the coil diameter of the stacked toe will gradually become smaller as described above, so the stacked state of the tow inside the can will have a contour as shown by the broken line T in the figure. A gap with a wedge-shaped cross section is formed between the inner wall of the can and the toe deposits or between the toe deposits, and a portion of the tow falling from above gets stuck in this gap, causing tangles of the tow.

In the present invention, the amount of air in the air curtain is increased sequentially as the upper surface of the toe rises (that is, the tow falling distance decreases), thereby reducing the amount of tow deposited in the can from the start to the end of can collection. The diameter of the coil is made uniform.

In other words, the inventors' research has shown that the top surface of the deposited tow is constant (
In other words, when the toe fall distance is constant), the coil diameter of the tow deposited in the can increases or decreases depending on the amount of air in the air curtain, and as the amount of air increases, the coil diameter increases,
It was found that the coil diameter becomes smaller as the air volume decreases.

Therefore, if the amount of air in the air curtain is gradually increased as the upper surface of the stacked toe rises, the tendency for the coil density to increase due to the rise in the stacked toe surface and the tendency for the coil density to decrease due to the increase in the air force-ten air volume are skillfully offset. The tow is always deposited with a uniform coil diameter, and the deposit has a contour as shown by a dashed line L in the figure. The degree of increase in the amount of air in the air curtain when implementing the present invention varies depending on the denier of the toe, the take-up speed, the size and speed of the rotating body, the size of the can, etc., but in general, the amount of air is increased sequentially from the start of can collection. It is preferable to increase the amount of air at the end of can storage to be 2 to 4 times the amount at the beginning. In carrying out the present invention, it is more effective to sequentially increase the amount of air in the air curtain and at the same time sequentially decrease the rotational speed of the rotating body 4.

Further, it is preferable to use a can 8 that has a slit or a through hole in its lower part so that the gas that has flowed into the can along with the tow can be discharged to the outside of the can.
According to the present invention as described above, since the tow is always deposited with a constant coil diameter from the start to the end of can collection, the tow inside the can has a uniform coil diameter from the bottom to the top, and the tow is deposited on the inside wall of the can and between the tow and the tow. A gap with a wedge-shaped cross section does not occur between the toe and the toe deposits or between the toe deposits, and therefore, a portion of the tow does not get stuck in the gap and deteriorate the creel property in the next process.

Example polyester fiber tow (3-way denier) 350 h/h
After passing through a pair of Nitzprofs and an ejector, a rotating body (outer diameter 20°, rotation speed 400) rotates at high speed.
The gas is discharged into the atmosphere from the tip of the curved tow passage provided in the pm) to form a coil, which falls and accumulates in a cylindrical can (inner diameter: 100 mm) placed approximately 2 h below the rotating body. I forced it.

At this time, air was jetted downward from a slit provided around the rotating body to form an air curtain surrounding the falling coiled tow, and the amount of air was varied.

The can was also rotated at a constant speed in the same direction as the rotating body. The relationship between the amount of air curtain air, the state of tow accumulation in the can, and the creel property in this case is shown in Table 1 below.

Table 1 *Displayed with air volume at the start of can collection as 1

[Brief explanation of drawings]

FIG. 1 is a schematic diagram showing one embodiment of the present invention.

Claims (1)

[Claims] 1. The tow taken at high speed is discharged along with a gas flow from the tip of a curved passage provided in a rotating body to form a coil, and the gas is ejected in a layered manner downward from the periphery of the rotating body to form a coiled tow. A can storage method in which an air curtain surrounding the coiled tow is formed and the coiled tow is dropped and deposited in a can, characterized in that the amount of air in the air curtain is gradually increased as the upper surface of the deposited tow rises in the can. How to store tow.