JPS6197007A - Formation of bundled body of hollow yarn separation membrane - Google Patents

Abstract

PURPOSE:To obtain the title bundled body with orderly shapes of the end surface by inserting a rigid core tube main body into a tube made of fluororesin to obtain a core tube around which a hollow yarn separation membrane is wound, and pulling out successively the core tube main body and the tube when the core tube is pulled out. CONSTITUTION:A hollow yarn separation membrane 20 is wound around a core tube 28 obtained by inserting a rigid core tube main body 50 made of metal, etc., into a tube 52 made of fluororesin, and a roll body 18a is formed. When the core tube 28 is pulled out from the roll body 18a, only the core tube main body 50 is firstly pulled out. Then when both sides of the tube 52 made of fluororesin are pulled respectively in the opposite directions the tube 52 is split at the machine-sewel part 54 in the middle and each part is pulled out respectively from opposite sides. Consequently, the hollow yarn from the roll body 18a or drawn into the inside and the roll body of orderly shapes can be easily manufactured.

Description

Detailed Description of the Invention [Industrial Application Field] The present invention utilizes the difference in permeability of each component in the raw material fluid to focus a hollow fiber separation membrane for separating a specific component from the raw material fluid. It concerns the method of forming the body.

[Conventional technology 1] Conventionally, there have been devices that use hollow fiber separation membranes and utilize the principles of osmosis or ultrafiltration to perform processes such as separating specific components from a fluid mixture (raw material fluid) and concentrating the material fluid. Various proposals have been made.

Figure 2 is a cross-sectional view showing the schematic configuration of such a fluid distribution device. 10 in Figure 2 is a container body with one end (lower end) sealed, and the other end (upper end) with a lid. body 1
2 is attached by suitable connecting means such as bolts.

A raw material fluid outlet 14 is provided at the lower end of the container body 10, and a raw material fluid inlet 16 is provided at the upper portion of the container body 10.

The upper end of the container body 10 is enlarged to form a head 10a, and a stepped portion 10b is provided around the inner peripheral side of the head 10a.

The hollow fiber separation membrane bundle 18 includes an extremely large number of hollow fiber separation membranes 20. This hollow fiber separation membrane 20
It has an upper synthetic resin plate 22 with its upper end embedded, and a lower synthetic resin plate 24 with its lower end embedded. The upper synthetic resin plate 22 is locked to the step tob and is in close contact with the step 10b via a sealing member (not shown), thereby sealing the inside of the container body 10. are doing. The lower synthetic resin plate 24 is locked to a protruding piece 10c that protrudes from the lower inner periphery of the container body 10.

The lower surface of the lid body 12 is slightly recessed, and the upper synthetic resin plate 2
A separation fluid chamber 26 is formed between the upper surface of the tube 2 and the top surface of the tube 2.

The hollow light beam @ll5I20 passes through the upper synthetic resin plate 22, and its upper end surface is exposed at the upper end surface of the synthetic resin plate 22, thereby communicating the inside of the hollow fiber separation membrane 20 with the separation fluid chamber 26. are doing. Note that the lower end side of the hollow fiber separation membrane 20 is embedded and sealed in a lower synthetic resin plate 24.

The hollow fiber separation membrane 20 is usually a thin tube-shaped membrane made of polyimide resin or the like with a diameter of about 200 to 500 pm,
A very large number of them are bundled into a bundle 18, which is inserted into the container body 10. The raw material fluid A is made to flow between these bundles 18 under high pressure, and the specific components are configured to efficiently permeate inside the hollow fiber separation membrane 20.

In such a fluid separation device, a raw material fluid A (for example, a mixed gas of hydrogen and methane) is introduced into the container body 10 from an inlet 16 . A specific component (for example, hydrogen) contained therein penetrates into the interior of the hollow light beam @20 and then moves upward therein, enters the separation fluid chamber 26, and enters the lid body 12. It is taken out from the takeout port 12a provided in the. Components that do not pass through the hollow fiber separation membrane 20 (for example, methane) flow down inside the container body 10 and exit through the outlet 14.
is discharged from the container.

A conventional method for forming the hollow fiber separation membrane bundle 18 will now be described with reference to FIG.

28 is a core tube, which is rotated by a drive device (not shown). 30 is a guide bar parallel to the core tube 28;
As the thickness of the hollow fiber separation membrane 20 wound around the core tube 28 increases, it is automatically controlled to move away from the core tube 28. 32 is a bobbin for hollow fiber separation llI220,
The hollow fiber separation membrane wrapped around this! The membrane 20 is supported by delivery rolls 34, 36, guide rolls 38, and tension rolls 40.
It is sent out via a guide roll 42 and a slider 44, and is wound around the core tube 28.

The slider 44 reciprocates in a predetermined section along the circumferential surface of the core tube 28 at a constant speed. Therefore, core tube 2
When the hollow fiber separation membrane 20 is supplied while rotating the membrane 8 and the slider 44 is reciprocated, the hollow fiber separation membrane 20 is continuously wound around the core tube 28 in a spiral shape, and the wound body 1
It is considered to be 8a.

A pair of bobbins 48 are installed at both ends of the core tube 28 in the axial direction, and supply a presser thread 46 that is continuously wound around both ends of the winding body 18a in the axial direction.
The hollow fiber separation membrane 20 is positioned at the same position in the axial direction of the core tube 28, and the end face A winding body 18a having uniform shapes is formed.

By winding a predetermined amount of the hollow fiber separation membrane 20 around the core tube 28, a wound body 18a of a predetermined size is obtained. Then, the presser thread 46 is unwound from the winding body 18a, and the core tube 2
8 from the wrapping body 18a.

Next, after wrapping a protective film around the circumferential surface of the wrapping body 18a, both ends of the wrapping body 18a are surrounded by a mold in a box shape, and a synthetic resin is poured into the mold to form a disc shape. Embed both ends into a synthetic resin board.

The synthetic resin plate that will become the upper synthetic resin plate 22 is cut in the direction of the board so as to also cut off the tips of the hollow fiber separation membranes 20 embedded therein. It is exposed at the end face of the plate 22 and configured so that the inside of the hollow fiber separation membrane 20 communicates with the separation fluid chamber 26 when the bundle is set in a container of a separation device.

After the bundle body 18 manufactured in this manner is inserted into the container body 10, the lid body 12 is connected to complete the fluid separation device.

C Problems to be Solved by the Invention] As described above, in the process of manufacturing the bundle 18, there is a step of pulling out the core tube 28 from the wound body formed by wrapping the hollow fiber separation membrane around the core tube 28. .

Conventionally, a metal such as stainless steel has been used as the core tube 28, but the frictional resistance with the hollow fiber separation membrane 20 wound around it is large, so when the core tube 28 is pulled out, the hollow fiber separation occurs. The membrane was likely to be pulled out from the center of the wrapping 18a (or conversely, drawn into the interior of the wrapping 18a), resulting in an irregular end surface shape, as schematically shown in FIG.

[Means for Solving the Problems] In order to solve the above problems, the present invention provides a core tube that includes:
It uses a rigid core tube body and a fluororesin tube attached to the core tube body, and a hollow fiber separation membrane is installed along the outer circumferential surface of the rotating core tube.
and a first step of forming a wound body in which the hollow fiber separation membrane is spirally wound by continuously winding the core tube while reciprocating in the axial direction of the core tube; 2. A method for forming a bundle of hollow fiber separation membranes, which includes a second step of pulling out a core tube from a wound body of hollow fiber separation membranes, wherein a fluororesin tube is attached to a rigid core tube body as the core tube. A method for forming a bundle of hollow fiber separation membranes, characterized in that when pulling out the core tube, first the core tube body is pulled out, and then the fluororesin tube is pulled out. .

It is to be noted that it is more effective to use a tube made of fluororesin having perforations or cuts in its central portion in the axial direction.

[Function] In the present invention, when pulling out the core tube from the one-volume packaging,
First, only the core tube body is pulled out. At this time, the two-di resin tube remains inside the wrapping body, so no frictional force acts between the core tube body and the hollow weight #i membrane. The shape of the wrapping body does not change at all.

After pulling out the core tube body, pull out the fluororesin tube. This fluororesin tube is flexible and the core tube body inside it has already been pulled out, so it can be easily reduced in diameter. do. Therefore, when the tube is pulled out, the hollow fiber separation membrane is not dragged by the tube or drawn into the wrapped body, and a well-shaped membrane can be obtained.

Note that if a perforation or cut is provided in the axially central portion of the fluororesin tube, the fluororesin tube can be pulled out from both ends simultaneously. Therefore, the forces acting on the hollow fiber separation membrane of the wrapping body that are in contact with the fluororesin tube are strong in magnitude and opposite in direction. Extraction and internal retraction are more reliably prevented.

[Example] FIGS. 1(a) to 1(C) are sectional views explaining the present invention.

In FIG. 1(a), the hollow fiber separation membrane 20 is wound around the core tube 28 to form a wound body 18a.

As shown in FIG. 1(b), this core tube 28 is connected to the core tube main body 5.
0, and a fluororesin tube 52 attached to this core tube body 50.

Further, a perforation 54 is provided in the axially central portion of the fluororesin tube 52.

The core tube main body 50 may be in the shape of a hollow pipe, as shown in an enlarged view in FIG. 1(b), or may be in the shape of a solid rod. A rigid material that does not bend is sometimes used for wrapping, such as a metal material.

Further, as the fluororesin constituting the fluororesin tube, polychlorotrifluoroethylene can be used in addition to polytetrafluoroethylene commercially available under trade names such as Teflon and Fluon. Also, vinyl fluoride,
Copolymers of ethylene trifluoride, vinylidene fluoride, propylene hexafluoride, etc. can also be used.

Wrapping body 1 of hollow fiber separation membrane I membrane 20 configured in this way
When pulling out the core tube 20 from the core tube 8a, first, only the core tube body 50 is pulled out, and at this time, the fluororesin tube 52 remains inside the wrapping body 18a. In addition, the core tube body 50
When pulling out the core tube body 50, the end surface 56 of the winding body and the end surface 58 of the fluororesin tube 52 are held down with a plate (not shown), etc., and the force in the opposite direction to the pulling direction of the core tube body 50 is absorbed by the hollow fiber. It is preferable to apply it to the gI membrane 20 or the fluororesin tube 52.

After the core tube main body 50 has been pulled out, both sides of the fluororesin tube 52 are simultaneously pulled in opposite directions. Then, the fluororesin tube 52 has a perforation 54 in the center.
It is torn at this point and pulled out from the opposite side. 1st
Figure (c) is a sectional view showing a state in the middle of extraction. Since this fluororesin tube is pulled out simultaneously from both sides in the axial direction, the winding body 18
The forces acting on the hollow weight component #v2o constituting a are opposite in direction and equal in magnitude.

Therefore, the hollow weight 1111IBJ20 in contact with the fluororesin tube 52 is not pulled out from the wrapping body 18a.

Note that the wrapping body 18a of this embodiment can be formed by the same method as that described in the section of the prior art, but
In the present invention, in short, it is sufficient that the hollow fiber separation membrane is wound around the core tube so as to extend in a direction including the axis of the core tube, and it is not necessary that the hollow fiber separation membrane be wound by a method other than the above. It is clear that it is also good.

In the above embodiment, perforations 54 are provided in the fluororesin tube 52, thereby making it easier to pull out the fluororesin tube 52, but in the present invention, cuts are provided in place of the perforations. Also good,
As this cut, a shallow or deep groove may be provided so as to go around the fluororesin tube, such grooves may be provided at predetermined intervals in the tube circumferential direction, or a complete cut that divides the tube into two may be used. A cut may be provided.

Note that the fluororesin tube 52 does not necessarily need to be provided with perforations or cuts. In this case, the fluororesin tube is pulled out in one direction, but as described above, the diameter of the tube is easily reduced. , Hollow weight gII when pulling out the tube! 2 will not be pulled out from the wrapping body or vice versa.

The core tube main body and the fluororesin tube are extracted from the synthetic hollow fiber GL membrane a-pack, and a protective film is wrapped around the periphery thereof, for example, as explained in the section of the prior art. A synthetic resin plate is formed on both ends of the rear one, and one end face of this synthetic resin plate is then cut to form a bundle of hollow fiber separation membranes, which is used in a fluid separation device.

[Effects] As detailed above, the method for forming a bundle of hollow fiber separation membranes of the present invention includes a rigid core tube body as a core tube for winding the hollow fiber gI membrane, and a core tube attached to the core tube body. The membrane is made of a fluororesin tube made of fluorine resin, so that when the core tube is removed from the hollow fiber separation membrane wrapping, the hollow fiber separation membrane may be pulled out or drawn into the interior. It is possible to easily produce a product with a uniform shape without causing any distortion.

[Brief explanation of drawings]

Figures 1 (a), (b), and (C) are cross-sectional views explaining the method of the present invention, Figure 2 is a cross-sectional view showing a fluid separation device using a hollow fiber separation membrane, and Figure 3 is a hollow fiber separation membrane. FIG. 4 is a perspective view illustrating a method of forming a separation membrane wrapping, and a sectional view of the wrapping formed by a conventional method. DESCRIPTION OF SYMBOLS 10... Container body, 12... Lid body 18... Hollow fiber molecule a membrane bundle, 20...
...Hollow fiber separation membrane, 22.24...Synthetic resin plate, 28...
Core tube, 32...Hollow fiber separation membrane bobbin, 34.
...Delivery roll, 40...Tension roll, 44...Slider, 50...Core tube body, 52...Fluororesin tube, 54・
·····Perforation. Patent Applicant Ube Industries Co., Ltd. Agent Patent Attorney Tsuyoshi Shigeno Figure 4

Claims (2)

[Claims] (1) By continuously winding the hollow fiber separation membrane around the core tube while reciprocating it along the outer peripheral surface of the rotating core tube and in the axial direction of the core tube, the hollow fiber separation membrane spirals. A bundle of hollow fiber separation membranes comprising a first step of forming a wound body of hollow fiber separation membranes obtained in the first step, and a second step of pulling out a core tube from the wound body of hollow fiber separation membranes obtained in the first step. In the forming method, the core tube is one in which a fluororesin tube is attached to a rigid core tube body, and when the core tube is pulled out, the core tube body is first pulled out, and then the fluororesin tube is pulled out. A method for forming a bundle of hollow fiber separation membranes, characterized by: (2) The forming method according to claim 1, wherein a perforation or cut is provided in the axially central portion of the fluororesin tube.