JPS6211508A - Preparation of precursor of hollow yarn bundle for separating fluid - Google Patents

Abstract

PURPOSE:To obtain a precursor of hollow yarn having desired lease angle more simply than conventional process by allowing a yarn suspending device having plural bins protruded radially thereon to confront each other interposing a porous pipe and knitting traversely with a specified angle of lease while suspending the yarn on the bins. CONSTITUTION:Two pairs of yarn suspending devices 31, 41 having radially protruded bins 311, 411 interposing a porous pipe 1 are arranged. Hollow yarn 5 drawn from a bobbin 109 is fixed to one of the supporting shafts 2, and the supporting shaft 2, porous pipe 1, yarn suspending device 31, 41, are turned with specified direction continuously with a pulse motor 101. On one hand, a traverse cam 105 is driven with a pulse motor 108 to cause reciprocating motion of a traversing bed 107 to execute traverse knitting of the hollow yarn on the porous pipe 1. The angle of lease is decided by the ratio of number of revolution of the porous pipe 1 to the speed of the traversing bed 107, which is regulated to 1-30 deg.. Then, the yarn suspending device 31 is exchanged with a device 41 and the traverse knitting is continued. Thus, a desired precursor of the hollow yarn bundle is obtd. Then, cottom yarn is wound around the precursor, and the hollow yarn 5 is cut in the inside of the winding device 31.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for producing a precursor of a hollow fiber bundle used for fluid separation such as gas separation, dialysis, ultrafiltration, microseparation, and reverse osmosis. .

Conventionally, as a manufacturing method for hollow fiber bundles used for fluid separation, hollow fibers with a fluid separation effect are wound around a boppin attached to a yarn winding device having a traverse mechanism, traverse knitted, and then the knitted hollow fibers are knitted in a traverse manner. A method is known in which a sheet-like material is formed by cutting in approximately the same direction as the bopin rotating shaft, the material is rolled up in the cutting direction, and both ends are fixed with resin (see Japanese Patent Publication No. 52-38836). )
.

The reason why such a troublesome method is adopted is that traverse knitting using a conventional yarn winding device can only produce products with large edge angles due to the structure of the device, so the end of the cylindrical body obtained by traverse knitting cannot be knitted as is. This is because if the hollow fibers are fixed with resin, there will be a large number of unusable portions of the hollow fibers, which will be uneconomical, so the apparent helix angle must be reduced by the method described above.

(In addition, "twill angle" as referred to in Honkawa 18 Sho means hollow fibers traversed in the direction of the central axis of the bopin mentioned above or porous tubes mentioned below, on which hollow fibers for fluid separation are knitted on the outer periphery. This is the angle formed by this conventional method. After the hollow fibers are traverse-knitted on bopins, this is cut once to create a sheet-like material, and the sheet-like material must be wound in the cutting direction. It is extremely time consuming.

Therefore, an object of the present invention is to provide a method for cutting traverse-knitted hollow fibers to obtain a sheet-like product as in the conventional method, and a process for producing a hollow fiber bundle for fluid separation through traverse-knitting of hollow fibers. To provide a method for producing a precursor of a hollow fiber bundle for fluid separation, which does not require winding work and can more easily obtain a hollow fiber bundle in which the winding angle of the hollow fibers is at a desired angle than a conventional method.

To solve the same problem, the object of the present invention is to arrange at least one pair of thread hooks each having a plurality of pins protruding radially so as to face each other with a porous pipe in between, and to The thread hook hangs the hollow fiber for fluid separation on the pin of the device, and the thread hook reciprocates the hollow fiber between the devices to wrap the hollow fiber around the porous tube in a circular direction.
This is achieved by a method for producing a precursor of a hollow fiber bundle for fluid separation, which is characterized by traverse knitting at an angle of ~30°.

Such a precursor is prepared by separating the traverse knitting hollow fibers from the yarn hooking device by cutting the hollow fibers with a blade such as a slitter or a razor inside the hooking device, and then applying the above-mentioned method before or after the separation. The porous end portions of the traverse-knit hollow fibers are fixed to the cough duct to form a desired fluid separation hollow fiber bundle.

Prior to cutting the traverse-knitted hollow fibers, a loose thread is wound around the traverse-knitted hollow fibers (for example, using real cotton yarn and wound with an edge angle of 60 to 89''), and the traverse-knitted hollow fibers are Once the portion of the thread around the porous tube has been securely secured to the tube (or after having been securely secured), the solution may remove the retaining thread.

In the production of the precursor, if two or more pairs of thread hooking devices are used, the height from the center of the thread hook to the pin end of the device is different between the pair of thread hooking devices, and The pair of threads located closer to the porous tube lowers the height of the pin end in the device. In this case, the traverse knitting of hollow fibers is started using a machine for the innermost pair of threads closest to the porous tube, and the height of the knitted hollow fiber layer is such that the thread thread is at the height of the pins of the machine. Shortly before or beginning to exceed the length of the thread, the outer pair of threaders with longer pins is used.

The porous tube on which the hollow fibers for fluid separation are to be knitted may be a normal tube having holes for introducing or discharging fluid, or may be a tube made of wire mesh, etc. Depending on the purpose of the hollow fiber bundle, The material, diameter, length, porosity, etc. can be adjusted as appropriate. In terms of material, if a hollow fiber bundle is used, for example, to concentrate oxygen in the air, there is no particular restriction on the tube material as long as it has mechanical strength, but if it is used for blood purification etc. The pipe material must be made of a material (for example, polypropylene or polyethylene) that does not adversely affect the fluid to be treated. Fluids may be discharged or introduced through such tubes, but separation efficiency is usually better with discharge.

For example, in the case of a hollow fiber bundle for gas separation (gas separation module) for concentrating oxygen in the air to obtain about 40% by volume of oxygen-enriched air (50 liters) per minute, the diameter of the porous tube is The diameter is 60 to 70 em, the length is 800 to 10,001 m, and the porosity is about 20 to 40%.

The material of the hollow fibers may be polyethylene oxide, polyethylene, polypropylene, polystyrene, polyvinyl chloride, cellophane, etc. for gas separation, and cellulose, cellulose acetate, polyacrylonitrile, polymethyl methacrylate, ethylene/cellulose, etc. for dialysis or ultrafiltration. In the case of micro separation of vinyl alcohol copolymers, polysulfone, etc., cellulose acetate, polyvinyl alcohol, polycarbonate, polysulfone, polypropylene, etc., reverse 8! In the case of transparent, polyethyleneimine, polyamide,
Cellulose acetate, etc.

Usually, the outer diameter of hollow fibers is several tens to several hundred μm, the wall thickness is several tens of μm, and the fibers are microporous (30 to 60% are small pores with a diameter of several μm or less).
Or it is non-porous.

Preferred examples of hollow fibers for concentrating oxygen in the air are as follows.

(1) Material is polypropylene, polyethylene, (2) Outer diameter 240-280 μm, inner diameter 190-220 μm, thickness 20-30 μm1 (3) Microporous with 40-50% small pores of 0.1 μm x 1-2 μm, (4) Bubble point (ASTM F316-76)
is 10-20kO/c+e2G.

(5) Commercial products such as Mitsubishi Rayon KPF190M
and KPF 270B.

(6) A synthetic resin film having a thickness of 0.1 to 5.0 μm and having oxygen permeability, such as a single layer of alkyl acrylate polymer containing fluorine and oxygen, is usually provided on the surface of the hollow fiber.

(7) The length of the hollow fiber to condense oxygen in the air and obtain oxygen-enriched air 50Q at a rate of 40 volumes and 1% per minute depends on the type of hollow fiber, but the total length is usually 70 km. be.

The number of such hollow fibers may be one or more (for example, 2 to 4).
0 pieces) are bundled together and traverse knitted.

During traverse knitting, if the angle between the hollow fibers at the point of contact between the hollow fibers (which is twice the ridge angle) is β, then β#6
At temperatures of 0 to 120°C, the hollow fiber contact portions are likely to be soaked. Therefore, the wind angle needs to be about 30@ or less or about 60@ or more. If the helix angle is about 60" or more, the process of fixing the ends of the traverse-knitted hollow fibers to the porous tube will result in a large portion of the hollow fiber becoming unusable, making it uneconomical. Therefore, the helix angle should be about 30 degrees or less. However, at 0'', the degree of filling of the hollow fiber container (container containing the hollow fiber bundle) is low and tends to be uneven. Therefore, in order to prevent crushing at the contact point between the hollow fibers and the thread, to improve the degree of filling of the hollow fibers, and to reduce the unusable portion of the hollow fibers at the end of the hollow fiber bundle, the helix angle should be approximately 1 to 1. 30° is preferred, and more preferably about 1-15°.

The number of hollow fiber layers in the case of traverse knitting can be arbitrarily determined as required, but for example, the number of hollow fiber layers can be 500 to 100,011 by using 2 to 5 pairs of threading devices.

The size of the device, the pin spacing, etc. of the thread hook can be arbitrarily determined depending on the hollow fiber bundle to be produced, but it is usually a needle-shaped ring with a length of 10 to 100 cm and a ring with a diameter of 50 to 300 cm. Pitch the pins or rods from 1.0 to 3. It is obtained by protruding radially with Qlm.

The material for this device is not particularly limited as long as it has the mechanical strength necessary for traverse knitting.

Traverse knitting of hollow fibers is carried out by supporting the above-mentioned porous tube and threading device on a common shaft and rotating them together around the center line of the shaft.

In this case, it is advantageous for the hooking of the hollow fibers to the device pins and the reciprocating operation to be carried out using a traverse mechanism equipped with a thread guide as in conventional thread winding devices.

The operation of fixing the portions of hollow fibers traversed on a porous tube on both ends of the tube to the cough tube is described, for example, in Japanese Patent Publication No. 44-5.
As described in Japanese Patent No. 526, a synthetic resin can be used. In this case, the resin is preferably one that hardens at room temperature, and an example thereof is an epoxy resin.

Yutaka Tomo-1 Hereinafter, one embodiment of the present invention will be described in connection with the production of a precursor of a hollow fiber bundle for obtaining oxygen-enriched air.

First, as shown in Figure 1, the inner diameter is 50 x the outer diameter is 60 x the length is 80 mm.
Insert a pair of support shafts (2, 2) into both ends of a stainless steel porous tube (1) with a size of (41) is fitted.

In this way, a pair of thread hooking devices (31, 31) are arranged facing each other so as to sandwich the porous pipe (1), and furthermore, the device (31,
, 31), the other pair of thread hooks are attached to the device i! (41,4
1) are placed facing each other.

The thread hook device N (31) is a ring having a diameter (outer diameter) of 70 mm and has 64 pins (311) having a length of 40+ am protruding radially at equal intervals. Also, the thread hook is a device (41)
is a ring with a diameter of 110gv and a pin with a length of 5゜■ (41
1), 128 of which are protruded radially at equal intervals.

One support shaft (2) is supported by a spindle (102) driven by a pulse motor (101), and the other shaft (2) is rotatably supported by a rolling center (103). 102) and rolling center (103) are both installed on a suitable pedestal (104).A traverse cam <105) is also mounted on this pedestal to rotate so as to be parallel to the porous tube (1). It is supported freely and the traverse platform guide (10
6) is supported. A traverse table (107) having a yarn guide is supported on the guide (106), and the traverse table (107) is engaged with the cam (105). The cam (105) is driven by a pulse motor (108).

Hollow fiber made of porous polypropylene whose surface is coated with resin (
The boppin (109) wound with 5) is supported by a unraveling machine (not shown), and the end of the hollow fiber (5) pulled out from the boppin is passed through the yarn guide of the traverse table and fixed to one of the support shafts (2). do. The fixed position is outside the thread hook device (31).

After such preparation, the support shaft (2, 2), porous tube (1), and thread hooking device (31, 3L) are moved by the pulse motor (101).
41.41) is continuously rotated in a fixed direction, the traverse cam (105) is driven by the pulse motor (108), and the traverse table (107) is reciprocated along the porous pipe (1), and the hollow The yarn is traversed onto the porous tube.

The traverse knitting will be explained in more detail based on FIGS. 2 and 3.

The traverse table (107) is moved to the right as shown in FIG. 2 from the initial preparation state shown in FIG.
LSI). The traverse table (107) stops once by activation of the limit switch (LSl), and then begins to move to the left. Even when the traverse table (107) is temporarily stopped, the porous tube (1) is kept rotating continuously. Then, as shown in Figure 3, the hollow fiber (5) is attached to the thread hooking device (31).
It hangs on the pin. Similarly, the movement of the traverse table (107) to the left is temporarily stopped by the limit switch (LS2) located slightly outward of the left thread hook ff1 (31)D.
Switched to movement in the opposite direction. I recommend traverse knitting in this way.

The winding angle α is the ratio of the rotational speed Ur of the porous tube (1) to the speed Ut of the traverse base (107) Ut /Ur −1/sin
Although it is arbitrarily determined from α, when the hollow fiber layer, which is α #8″ in this example, becomes thicker, the yarn threading device (31, 31
) instead of thread hook! Continue traverse knitting using (41, 41). In this case, the limit switch (LSl)
), (LS2) is threaded W! It is placed slightly outside of (41, 41).

In this way, when the number of hollow fibers (5) Jii reaches a predetermined value, a desired hollow fiber bundle precursor is obtained. After this, real cotton thread is wound on the precursor with a twill pattern 856, and then the thread is wrapped! Cut the hollow fiber (5) inside (31, 31). This cutting is performed with a blade such as a slitter or razor.

After the cutting, remove the porous tube (1) from the support shaft (2),
The hollow fiber on the tube end is fixed to the tube end with epoxy resin, and the cotton yarn is removed. In this case, as shown in FIG. 4, the epoxy resin enters the gap between the hollow fibers (5) at one end of the tube and fills the gap airtightly.
1) It is hermetically fixed to the end and is formed as a partition wall (6) as shown in FIG. 4 as a whole. The cut open ends of the hollow fibers are open on the outer surface of this partition (6). Further, at the other W end, the epoxy resin closes the cut opening of the hollow fiber and fixes the hollow fiber to the tube end.

Hollow fiber bundle for obtaining oxygen-enriched air (8)
get.

This focusing body (8) is connected to the casing (
9), the outer periphery of the partition wall (6) is hermetically connected to the inner wall surface of the casing, and a pipe (91) is hermetically connected to the end of the porous tube (5). Therefore, air is supplied to the air inlet (92) of the capacity B (9), and at the same time, air is supplied to the air outlet (93).
) is pulled by a vacuum pump, the air that has entered the casing passes through the gap between the hollow fibers (5) and enters the pipe (1) and is released from the pipe (91) as oxygen-depleted air. ) oxygen-enriched air is sucked out.

FIG. 5 shows an example (8') of a hollow fiber bundle for hemodialysis obtained by the method of the present invention, in which the porous tube (1
At both ends of the hollow fiber (5'), the epoxy resin liquid-tightly fills the mR between the hollow fibers (5') and connects the hollow fibers to the pipe (1').
It is fixed liquid-tightly at the end, and the partition wall (6') as a whole,
(7'). The cut open ends of the hollow fibers (5') are open at the outer surfaces of the partitions 1 (6') and (7'). This bundle (8') is connected to the casing (9')
The outer circumferences of the partition walls (6') and (7') are fluid-tightly connected to the inner wall surface of the casing. A pipe (91') is liquid-tightly connected to one end of W (5'), and the other end is closed with epoxy resin. Therefore, blood entering from the blood inlet (92') of the casing (9') passes through the hollow part of the hollow fiber (5') and flows out from the blood outlet (93'), while the dialysate inlet (94') between the partition walls flows out. ) flows into the pipe (1') through the gap between the hollow fibers and exits from the pipe (91'').

According to the present invention, when producing a hollow fiber bundle for fluid separation through traverse knitting of hollow fibers, the precursor of the hollow fiber bundle can be prepared more easily than in the conventional method. The hollow fiber can be obtained in a state in which the edge angle is within a desired angle.

[Brief explanation of drawings]

Figures 1 to 3 are for explaining embodiments of the method of the present invention, and Figure 1 shows an example of a traverse knitting device equipped with a porous tube and a hooking device, and a hollow fiber traverse knitting device. A schematic slope view of the starting point, Figures 2 and 3 are explanatory diagrams of the traverse knitting procedure, and Figure 4 is a schematic cross-section of the hollow fiber bundle housed in the casing for obtaining oxygen-enriched air. FIG. 5 is a schematic cross-sectional view of a hollow bundle for hemodialysis housed in a casing. (2)... Support shaft, (1), (1')... Porous pipe, (31, 31), (41, 41)... Threading device, (
5), (5')...Hollow fiber, (6), (6'), (7')...Partition wall (epoxy resin), (7)...Epoxy resin, (8), (8 ')...Hollow fiber bundle, (9), (9'
)···casing. (that's all)

Claims (1)

[Claims] (1) At least one pair of threading devices each having a plurality of pins protruding radially are arranged to face each other with a porous tube in between, and the hollow fiber for fluid separation is threaded onto the pins of the opposing threading devices. A hollow fiber bundle precursor for fluid separation, characterized in that the hollow fibers are reciprocated between the yarn threading devices to traverse knit the hollow fibers around the porous tube at a winding angle of about 1 to 30 degrees. manufacturing method.