JPS6133785B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a hollow fiber winding device suitable for winding, for example, hollow fibers having selective permeability for substances onto a skein frame after spinning.

In recent years, hollow fibrous selectively permeable membranes have been used in hemodialysis devices, separation devices using ultrafiltration or reverse osmosis, gas separation devices, and the like. When producing this hollow fiber, a spinning dope is linearly extruded from an annular slit, and a core liquid is discharged into the center of the extruded dope to maintain its hollow shape. The hollow fibers thus spun are subjected to treatments such as coagulation and water washing, and then wound onto a skein frame. However, the 1st A
As shown in the figure, a pair of fixed skein frames 11a, 11b
When the hollow fibers 2 are guided by a suitable guide and wound continuously around the hollow fibers 2 to form a hollow fiber bundle, the following drawbacks occur. That is, since the linear hollow fibers 2 having a circular cross section are always wound in the same direction, that is, in the example shown, clockwise around the skein frame 1, each time the number of windings increases, One twist is accumulated in the attached hollow fiber. This twist is transmitted separately in the downstream and upstream directions of the guide. That is, it is not possible to completely prevent even a small percentage of the twist generated each time the yarn is wound from being transmitted to the yarn upstream of the guide.
As a result, a large amount of twist accumulates in the yarn upstream of the guide, and eventually it is unable to withstand the torsional stress and is unable to maintain a circular cross section, causing it to collapse as shown in Figure 1B. In this way, the twisted hollow fibers can no longer be used practically as permeable membranes for separation devices. Due to these drawbacks, it has not been possible to date to continuously wrap hollow fibers around a fixed skein frame.

The present invention was made to correct these defects, and when winding the hollow fiber onto a winding frame,
The present invention relates to a hollow fiber winding device characterized in that the hollow fiber is wound around a winding frame by a predetermined length, and then the winding direction is changed so that further winding can be performed. With this device, hollow fibers can be wound well without twisting,
Furthermore, it has the advantage that, for example, the skein frames can be lined up on a conveyor and fed in stages, so that the subsequent processing can be automated without cutting the fibers.

An embodiment of the present invention will be described below with reference to FIGS. 2 to 5.

First, the winding method using the apparatus of this embodiment will be explained with reference to FIGS. 2 and 3. The skein frame 11 is fixed on an endless chain 12 shown in FIG. Then, the leading part 2a of 20 cellulose ester hollow fibers 2 spun from 20 spinnerets is placed on one skein frame 11.
Apply to b, continue as is, start the yarn speed from the spinning device to 50
The hollow fibers 2, which are continuously fed at a rate of m/min, are guided to the other skein frame 11 by the guide means shown in FIG.
lead to the top of a. This guide means holds the hollow fibers 2 while holding the skein frames 11a and 11 at a distance of 1.5 m from each other.
It is configured to be able to rotate around b. Therefore, the hollow fibers 2 wound on the skein frames 11b to 11a as described above are further wound on the skein frames 11a to 11a.
1b, and the same operation is then repeated.

After winding the hollow fiber 2 a specified number of times between the skein frames 11a and 11b, the next step is shown in FIG.
The hollow fibers 2 are connected to the skein frame 11a as shown in the figure (imaginary line).
and 11b, and pass through the skein frames 11b to 11.
lead to a. And after this, the skein frame 11a, 11
The hollow fiber 2 is further wound a specified number of times in the direction opposite to the initial winding direction between the steps b. Therefore, the hollow fiber 2 is continuously wound with the winding direction reversed halfway through. The number of hollow fibers may be one or 100. It is desirable that the winding direction be reversed alternately until the end of winding. In addition, the point of reversal may be set at an appropriate time as long as the circular cross section of the hollow fibers is not deformed due to the accumulation of twists, but the twist of the hollow fibers in the previous winding direction may be reversed during the subsequent winding in the opposite direction. must be selected to be removed.

In this way, when the winding direction is reversed after the hollow fiber 2 has been wound a predetermined number of times or for a predetermined length, the twist of the hollow fiber due to the previous winding direction is accumulated and the cross section of the hollow fiber is deformed into a circular shape. Before twisting or collapsing, twisting of the hollow fibers occurs due to the subsequent winding direction, and the directions of these twists are opposite to each other. Therefore, the twist of the hollow fibers due to the previous winding direction is gradually resolved as the subsequent winding progresses, and when the winding is completed, most or substantially all the twists of the hollow fibers can be removed. Further, when the hollow fiber bundle is removed from the skein frame, the twist of the hollow fibers in the previous winding direction and the twist of the hollow fibers in the subsequent winding direction cancel each other out. In any case, the removed hollow fiber bundle does not undergo any twisting and crushing deformation as seen in the past, and a straight and neatly arranged hollow fiber bundle can be obtained. Therefore, although the operation of loading this hollow fiber bundle into a dialysis case can be carried out smoothly and favorably, problems such as blood coagulation may occur in devices that are assembled by being fixed to the case because the hollow fibers are aligned. Never.

FIGS. 4 and 5 show a winding device according to this embodiment.

As shown in FIG. 4, winding is performed when the chain 12 is driven so that the winding frame 11 fixed on the endless chain 12 faces upward. The hollow fiber 2 is guided back and forth around the skein frames 11a and 11b by a guide 27 that reciprocates around the guide frame 20 by a traverse mechanism, which will be described later, and is wound up.

In the illustrated example, the traverse mechanism is chain 1
8 and its sprockets 16 and 17. Transmission 1 of this chain 18
4. By being rotated in the direction of the arrow by the variable speed motor 13 via the rotational transmission system 15, the support body 21 (see FIG. 5) is reciprocated via the interlocking rod 19. A guide roller 29 is integrally attached to the support 21, and this roller 29 rolls on the rail of the guide frame 20 to ensure reciprocating movement of the support 21. As shown in FIG. 5, a solenoid 30 is attached to this support body 21, and an output rod 31 that reciprocates when the switch 22 is operated is provided so as to pass through the rotor 29. . The hollow fiber guide 27 is attached to the right end of the output rod 31. Therefore, when the output rod 31 reciprocates, the guide 27 moves back and forth in the direction of the arrow to wind the hollow fiber 2 around the winding frames 11a and 11b. In this case, the guide 27 must be moved back and forth at the position of the take-up frames 11a and 11b, and therefore the abutment piece 2 that abuts the switch 22
3 and 24 are arranged at both ends of the reciprocating motion, as shown in FIG.

In the above configuration, the guide 27 includes the take-up frame 11a,
Although the above-mentioned winding method is not carried out only by rotating around the winding frame 11b in one direction, in the winding device of this embodiment, the winding frame 11a and the winding frame 11b are rotated in one direction. Another contact piece 2
5 (see Fig. 4). This contact piece 25 has a disk shape as shown in the figure, and is rotated at a constant speed in the direction of the arrow by a small motor 26, and when the convex portion 33 is located downward (in the state shown in the figure), the switch 22 comes into contact. Therefore, Guy 27
moves back and forth (displaces in a direction substantially perpendicular to the plane defined by the take-up frames 11a and 11b) at an intermediate position between the two take-up frames 11a and 11b, and moves to the reciprocating end in that state. It turns out. Then, the guide 27 comes into contact with the contact piece 24 again, and is displaced in the opposite direction to the above displacement. In this way, the winding direction will be reversed. This reversal is performed by the disc-shaped contact piece 25.
Depending on the rotational speed of the winding, for example, reciprocating winding is performed every several tens of times. Electrical energy is supplied from the control box 32 to the solenoid 30 through a coiled lead wire 34, as shown in FIG. 4, allowing the solenoid 30 to reciprocate.

The illustrated examples described above are a traverse mechanism using a chain and its sprocket, and a displacement mechanism using a solenoid system, but the present invention is not limited to these illustrated examples. Furthermore, various configurations of the guide 27 can be used, such as a ring guide, a water flow guide, and a roller guide.

According to the winding device of the present invention, each time the hollow fiber is wound for a predetermined length, the winding direction is reversed and further winding is performed. Twisting can be eliminated and accumulation of twists can be effectively prevented. Therefore, in the processing after winding, the hollow fibers can be held in a straight shape, so that the processing can be carried out smoothly and successfully.

Further, in the winding device according to the present invention, the guide member is reciprocated between the two winding frames by the traverse mechanism, and when the guide member has reciprocated a predetermined number of times, the guide member is moved back and forth between the two winding frames. Since the method of displacing the members is adopted, the above-mentioned winding method can be realized with an extremely simple structure, and in addition to being able to simplify the structure, it is possible to provide an inexpensive and effective device.

[Brief explanation of the drawing]

Fig. 1 shows a conventional example, in which Fig. 1A is a schematic perspective view of a state in which hollow fibers are wound around a skein frame, and Fig. 1B shows a state in which a twist has occurred in the hollow fiber bundle after winding. FIG. 2 to 5 show an embodiment of the present invention, in which FIG. 2 is a schematic perspective view showing a state in which hollow fibers are wound between skeins, and FIG. 3 is a state shown in FIG. 2. FIG. 4 is a perspective view schematically showing the structure of the winding device, and FIG. 5 is a cross-sectional view showing only the essential parts of FIG. 4. In addition, in the symbols used in the drawings, 2... hollow fiber, 11, 11a, 11b... skein frame, 22... switching switch, 23, 24... first switching means, 2
5...Second switching means, 27...Guide, 30...
...Solenoid.

Claims (1)

[Claims] 1. A pair of winding frames made of rod-shaped bodies that stand up substantially parallel to each other, a guide member that guides the hollow fiber, and a traverse mechanism that reciprocates the guide member between the pair of winding frames. , a displacement mechanism that moves the guide member in a direction substantially perpendicular to a plane defined by the pair of take-up frames;
a changeover switch that changes the direction of movement of the guide member by the displacement mechanism; a first changeover means that changes over the changeover switch at a position corresponding to each of the pair of take-up frames; and second switching means for switching the changeover switch at a position between the pair of winding frames when the winding frames reciprocate a predetermined number of times.