JPH0126722B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a method for producing a cross-wound bundle of hollow fibers used for fluid separation such as gas separation, dialysis, ultrafiltration, microseparation, reverse osmosis, and the like.

More specifically, in the present invention, pin wheel type threading machines in which a plurality of pins are arranged radially in parallel at equal intervals are arranged at intervals, and while the threading machines are rotated, a hollow space between the threading machines is This invention relates to a method for producing a cross-wound bundle of hollow fibers for fluid separation, in which the yarn is reciprocated and is made into a cross-wound bundle.

Conventional technology and its problems Conventionally, as a method for manufacturing a cross-wound bundle of hollow fibers for liquid separation with such specifications, there has been a method disclosed in Japanese Patent Application Laid-Open No. 1986-
The invention disclosed in Publication No. 7604 has been proposed. According to this conventional method, it is possible to easily obtain a cross-wound bundle of hollow fibers for fluid separation, but since only one threading machine is disposed at the traverse end of the hollow fibers, the hollow fiber bundle can be easily obtained. As the diameter of the hollow fiber increases, the twilling of the hollow fiber becomes sparse. Therefore, the conventional method described above has a problem in that it is not possible to obtain a hollow fiber bundle having a uniform density. In order to avoid this problem, if the rotational speed or rotational distance of the threading machine is controlled in accordance with the increase in the winding diameter of the hollow fiber bundle, the problem of complicating the device will arise. More will be added.

An object of the present invention is to provide a method for manufacturing a cross-wound bundle of hollow fibers for fluid separation, which solves the above-mentioned problems and can easily obtain a cross-wound bundle of hollow fibers with substantially uniform density.

Means for Solving the Problems The object of the present invention is to install a pin wheel type threading machine in which a plurality of pins are arranged radially in parallel at equal intervals, at both ends of a perforated pipe so that the pipe and the threading machine are in line. A twill of hollow fibers for fluid separation in which the hollow fibers are arranged side by side, and the hollow fibers are reciprocated between these threading machines while rotating the threading machine and the porous pipe, and the hollow fibers are made into a twill bundle. The method for manufacturing a wound bundle, characterized in that the threading machines are arranged in a plurality of locations around the end of the tube, and the outer diameter and the number of pins are sequentially larger as the threading machines are arranged on the outer side. This is achieved by a method of manufacturing a cross-wound bundle of hollow fibers for fluid separation.

Such a cross-wound bundle of hollow fibers is produced by cutting the hollow fibers with a knife inside the yarn threading machine, separating the cross-wound hollow fibers from the threading machine, and separating both ends of the hollow fiber cross-wound bundle. , and is fixed to a porous tube to form a twill bundle of hollow fibers for desired fluid separation.

Prior to cutting the hollow fiber, an anti-unraveling thread is wound on the cross-wound hollow fiber (for example, it is wound using cotton thread at a winding angle of 60° to 89°), and the cross-wound hollow fiber is The portions on both ends of the porous tube may be fixed to the tube (at the same time as they are fixed, or after being fixed), and the unraveling thread may be removed.

In producing the cross-wound bundle, cross-winding of the hollow fibers is first started using a yarn winding machine located on the inside closest to the perforated tube, and the outer diameter of the cross-wound hollow fiber layer is equal to that of the yarn. Shortly before or beginning to exceed the outside diameter of the hook, the next outer diameter is used.

The perforated tube on which the hollow fiber for fluid separation is to be wound in a cross-wound manner may be a normal tube having holes for introducing or discharging fluid, or may be a tube made of wire mesh or the like.
Depending on the purpose of the cross-wound hollow fiber bundle, its material,
The diameter, length, porosity, etc. can be determined as appropriate.
In terms of material, if a hollow fiber cross-wound 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 it cannot be used for blood purification etc. If so, it is necessary to use a pipe material that does not adversely affect the fluid to be treated (for example, polypropylene or polyethylene). The fluid may be discharged or introduced through such a tube, but the separation is usually more efficient if the fluid is discharged.

For example, in the case of a hollow fiber bundle for gas separation (gas separation module) to condense oxygen in the air and obtain oxygen-enriched air of about 40% by volume per minute, the diameter of the porous tube is 60 mm to 70 mm. , length is 800mm ~
The diameter is 1000mm, and the open area ratio is about 20% to 40%.

The material of the hollow fiber is for gas separation, such as polyethylene oxide, polyethylene, polypropylene, polystyrene, polyvinyl chloride, cellophane, etc. For dialysis or ultrafiltration, cellulose, cellulose acetate, polyacrylonitrile, polymethyl methacrylate, ethylene, etc. /Vinyl alcohol copolymer, polysulfone, etc., in the case of micro separation, cellulose acetate, polyvinyl alcohol, polycarbonate, polysulfone, polypropylene, etc., in the case of reverse osmosis, polyethyleneimine,
These include polyamide, cellulose acetate, etc.

Typically, hollow fibers have an outer diameter of several tens of μm to several hundred μm, a wall thickness of several tens of μm, and are microporous (a few μm in diameter).
30% to 60% of small pores) or non-porous.

Preferred examples of hollow fibers for concentrating oxygen in the air are shown below.

(1) The material is polypropylene or polyethylene.

(2) Size: outer diameter 240μm to 280μm, inner diameter 190μm
~220μm, thickness 20μm~30μm.

(3) It is microporous with 40% to 50% small pores of 0.1 μm x 1 to 2 μm.

(4) Bubble point (ASTM F316−76) is 10
~20Kg/cm ² G.

(5) Commercial products such as Mitsubishi Rayon
KPF 190M and KPF 270B hollow fibers are preferred.

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

(7) The length of the hollow fiber used to condense oxygen in the air and obtain oxygen-enriched air of about 40% by volume per minute is usually about 70 km, although it depends on the type of hollow fiber. belongs to.

Such hollow fibers are cross-wound one by one or in a bundle of a plurality of fibers (for example, 2 to 40 fibers).

During twill winding, if the angle between the hollow fibers at the point of contact between the hollow fibers (which is twice the twill angle) is β, then β
When the angle is ≒60° to 120°, the hollow fiber contact portion tends to collapse.
Therefore, the winding angle is preferably about 30° or less or about 60° or more. If the wind angle is approximately 60° or more,
In the process of fixing the ends of the twilled hollow fibers to the perforated tube, many parts of the hollow fibers become unusable, which becomes uneconomical. Therefore, the helix angle should be approximately 30° or less, but 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 the hollow fibers from collapsing at their contact points, improve the filling degree of the hollow fibers, and further reduce the unusable portion of the hollow fibers at the ends of the hollow fiber twill bundle, The twill angle is preferably about 1° to 30°, more preferably about 1° to
It is 15°.

The number of twill-wound hollow fiber layers can be arbitrarily determined as required, but for example, when 2 to 5 yarn winding machines are arranged at both ends of a porous tube, 500 to 1000 hollow fiber layers can be formed. can do.

The outer diameter, pin spacing, etc. of each threading machine can be arbitrarily determined depending on the cross-wound hollow fiber bundle to be manufactured. Usually the above ring has a diameter of 50
mm to 300 mm, and the pin can have a length of 10 mm to 100 mm and a pitch of 1.0 mm to 3.0 mm. The material of this threading machine is not particularly limited as long as it has the mechanical strength necessary for traversing.

Cross-winding of the hollow fibers is carried out by supporting the above-mentioned perforated tube and threading machine on a common support shaft and rotating them together around the center line of the support shaft.

In this case, it is advantageous for the hooking of the hollow fibers to the threading machine pins and the reciprocating operation to be carried out using a traverse mechanism with a thread path, such as in a traverse winding machine for textile threads.

The operation of fixing the portions of the hollow fiber corresponding to both ends of the porous tube to the tube can be carried out using a synthetic resin, for example, as described in Japanese Patent Publication No. 44-5526. In this case, the resin is , those that harden at room temperature are preferred, such as epoxy resins.

In addition, the "traverse angle" as used in this specification is the angle formed between the central axis direction of the porous tube and the hollow fiber wound in a crosswise manner thereon.

Embodiment An embodiment of the present invention will be described below with reference to the accompanying drawings.

1 to 3 show an example of an apparatus for carrying out a method for producing a cross-wound bundle of hollow fibers for obtaining oxygen-enriched air. As shown in FIG. 1, this device has support shafts 2 inserted into both ends of a stainless steel porous tube 1, and two threading machines 31,
41 are fitted with the former 31 on the inside and the latter 41 on the outside. The threading machines 31 and 41 are of a pin wheel type in which a plurality of pins 311 and 411 are arranged radially in parallel at equal intervals, and are arranged in a straight line with the perforated pipe 1 with the perforated pipe 1 in between. There is. In the device of this embodiment, there are two threading machines 31 and 41.
are arranged at both ends of the porous tube 1, but the apparatus for implementing the method of the present invention is not limited to this arrangement, and three or more may be arranged at the ends of the porous tube 1. The outer diameter and number of pins of each of these threading machines 31, 41 are larger as the threading machines are disposed on the outer side. For example, the above porous pipe 1 is
x length 800 (unit: mm), the threading machine 31 is attached to a ring with a diameter (outer diameter) of 70 mm and a length of 40 mm.
64 pins 311 of 50 mm in length can be protruded radially at equal intervals, and in this case, the threading machine 41 disposed on the outside is arranged in a ring with a diameter of 110 mm and 128 pins 411 of 50 mm in length are arranged at equal intervals. It can be provided with radial protrusions.

One of the above-mentioned support shafts 2 is connected to a pulse motor 10.
1, the other support shaft 2 is rotatably supported on a rolling center 103. The spindle 102 and rolling center 103 are both mounted on a suitable pedestal 104. Further, a traverse cam 105 and a guide rod 106 similar to those in the yarn traverse winding mechanism shown in FIG. 1 are supported on this frame 104 so as to be parallel to the porous tube 1. A traversing table 107 having a thread path is mounted on the guide rod 106, and the traversing table 107 engages with the cam 105. cam 10
5 is driven by a pulse motor 108.

The end of the hollow fiber 5 pulled out from a bobbin 109 wound with a polypropylene porous fiber 5 whose surface is coated with a resin passes through the thread path of a traversing table 107 and is fixed to one of the support shafts 2. Its fixed position is the threading machine 31
It is more external.

After such preparation, the pulse motor 101
While the support shaft 2, perforated tube 1, threading machines 31 and 41 are continuously rotated in a fixed direction, the pulse motor 1
08 drives the traverse cam 105 to reciprocate the traverse table 107 along the perforated tube 1, thereby winding the hollow fiber on the perforated tube. The above-mentioned porous tube 1 also contributes to making the initial twill winding of the hollow fiber 5 appropriate, in addition to the matters described below.

This twilling is done with reference to Figures 2 and 3.
It will be explained in further detail.

From the initial preparation state shown in FIG. 1, the traversing table 107 is moved to the right as shown in FIG. bring about. The traversing table 107 is temporarily stopped by activation of the limit switch LS1, and then begins to move to the left. Even while the traversing table 107 is once stopped, the porous tube 1 is kept rotating continuously. As a result, the hollow fiber 5 is hooked onto the pin 311 of the thread hooking machine 31, as shown in FIG. Similarly, the movement of the traversing table 107 to the left is
It is temporarily stopped by a limit switch LS2 installed slightly outside of the threading machine 31 located on the left side, and the movement is switched to the opposite direction. In this way, the hollow fiber 5 for fluid separation is hung between the threading machines 31 and 31, and the hollow fiber 5 is reciprocated so that the hollow fiber 5 is twisted around the perforated pipe 1.
Continue twilling at 1° to 30°. The wind angle α is perforated pipe 1
The ratio of the rotational speed Ur and the speed Ut of the traversing table 107
It is arbitrarily determined from Ut/Ur=1/sin α, but
In this embodiment, α≒8°. Shortly before the hollow fiber layer becomes thick and its outer diameter exceeds the outer diameter of the thread threading machine 31, or after it begins to exceed this outer diameter, the hollow fiber 5 is traverse-wound using the thread threading machine 41 disposed on the outside. Continue. In this case, limit switches LS1 and LS2
is installed slightly outside the threading machine 41.

As described above, the outer diameter of the threading machine 41 is larger than the outer diameter of the threading machine 31 disposed inside, and
1 is also configured to have a larger number of pins than the threading machine 31 (in this embodiment, the threading machine 41
The number of pins 411 is twice that of the threading machine 31).
That is, as the diameter of the hollow fiber layer increases, the hollow fiber 5 to be twill-wound is moved by the yarn winding machine 4 in which the pins are densely arranged.
It will be multiplied by 1. Therefore, it is possible to correct the thinning of the traverse winding density as the winding diameter increases by appropriately determining the number of pins of the outer threading machine 41 in advance with respect to the number of pins of the inner threading machine 31. can. As a result, the resulting cross-wound bundle of hollow fibers can be easily made to have a substantially uniform density, resulting in a high-quality cross-wound bundle. In addition, since the density correction described above can be performed by applying multiple threading machines in this way,
The device has a simple structure.

After obtaining the desired hollow fiber twill bundle in this way, cotton thread is wound around the periphery of the bundle at a traverse angle of approximately 85°, and then the hollow fiber 5 is wound inside the yarn winding machine 31.
cut. This cutting may be performed with a blade such as a slitter or razor.

After the cutting, the porous tube 1 is removed from the support shaft 2, the hollow fiber on the tube end is fixed to the tube end with epoxy resin, and the cotton thread is removed. In this case, as shown in FIG. 4, the epoxy resin enters the gap between the cross-wound yarn layers of the hollow fiber 5 and airtightly fills the gap at one end of the tube. A bulkhead 6 as shown in FIG.
is formed. The cut open end of the hollow fiber is connected to this partition wall 6.
is open on the outer surface. Further, at the other tube end, the epoxy resin closes the cut opening of the hollow fiber and fixes the hollow fiber to the tube end.

In this way, a cross-wound bundle of hollow fibers 8 for obtaining oxygen-enriched air is obtained.

As shown in FIG. 4, this bundle 8 is housed in a casing 9, and the outer periphery of the partition wall 6 is hermetically connected to the inner wall surface of the casing. In addition, a pipe 91 is airtightly connected to one end of the porous pipe. Therefore, when air is supplied to the air inlet 92 of the container 9 and the air outlet 93 is pulled by a vacuum pump, the air that has entered the casing passes through the gaps between the yarn layers of the cross-wound bundle of hollow fibers 5 and flows into the tube 1. The oxygen-depleted air is discharged from the pipe 91, and the oxygen-enriched air is sucked out from the air outlet 93.

FIG. 5 shows an example of a cross-wound bundle of hollow fibers for hemodialysis obtained by the method of the present invention with reference numeral 8'. In this case, the epoxy resin liquid-tightly fills the gap between the fiber layers of the cross-wound bundle of hollow fibers 5' at both ends of the porous tube 1', and also fixes the hollow fiber bundle to the end of the tube 1' in a liquid-tight manner. The partition walls 6' and 7' are formed as a whole. The cut open end of the hollow fiber bundle 8' is open at the outer surface of the partition walls 6', 7'. This bundle 8' is housed in a casing 9', and 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 the tube 1', 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' in the bundle 8' and flows out from the blood outlet 93', and on the other hand, it flows out from the dialysate inlet 94' between the partitions. The liquid enters the pipe 1' through the gap between the fiber layers of the hollow fiber bundle, and exits from the pipe 91'.

Effects of the Invention As is clear from the above, according to the present invention, a cross-wound bundle of hollow fibers can be easily obtained, and the cross-wound density of the bundle can be easily made almost uniform using a fluid. A method for manufacturing a cross-wound bundle of hollow fibers for separation can be provided.

[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 cross-winding device for carrying out the method of the present invention, including a perforated tube and a plurality of threading machines. A schematic perspective view of the installation and starting of hollow fiber twill winding, Figures 2 and 3 are explanatory diagrams of the twill winding procedure, and Figure 4 shows the installation of the hollow fiber bundle into the casing to obtain oxygen-enriched air. FIG. 5 is a schematic cross-sectional view of the hemodialysis hollow concentrator housed in the casing. 2...Support shaft, 1,1'...Porous pipe, 31,4
1... Threading machine, 5, 5'... Hollow fiber, 6, 6',
7'... Partition wall (epoxy resin), 7... Epoxy resin, 8, 8'... Cross-wound bundle of hollow fibers, 9,
9'...Casing.

Claims (1)

[Claims] 1 A pin wheel type threading machine with a plurality of pins arranged radially at equal intervals is arranged at both ends of a porous pipe so that the pipe and threading machine are lined up in a line, and the threading machine and the porous pipe are rotated. A method for producing a cross-wound bundle of hollow fibers for fluid separation, in which the hollow fibers are made into a cross-wound bundle with a specification in which the hollow fibers are reciprocated between these thread-threading machines while the thread-threading machine is . A method for manufacturing a cross-wound bundle of hollow fibers for fluid separation, characterized in that there are a plurality of arrangements at the ends of the tube, and the outer diameter and the number of pins are sequentially larger as the end of the tube is arranged.