JPS6257965A - Hollow yarn membrane knitted fabric - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention manufactures hollow fiber membrane modules used in artificial lungs, artificial dialysis, plasmapheresis, pure water production, body filtration/separation, water purifiers, etc. This invention relates to a hollow fiber membrane knitted fabric suitable for. In the present invention, knitted fabrics refer to fried foods or woven fabrics.

[Conventional technology]

Generally, a hollow fiber membrane module is manufactured by cutting a hollow fiber bundle to a predetermined length, storing the bundle in a container, and fixing the ends of the hollow fibers to the container with epoxy resin, urethane resin, or the like. However, if the opening at the end of the hollow fiber is fixed in an open state, resin will enter through the opening and the module will become unusable. Therefore, in order to avoid -tn, the eastern end of the hollow fiber was temporarily sealed with resin, etc. A method is adopted in which the hollow fiber is fixed in this state, and after fixing, the fixed part is cut to leave the eastern end of the hollow fiber in an open state.

[Problem that the invention seeks to solve]

In the conventional technology, there have been problems mainly with processing costs during temporary sealing during module production, reliability of the temporary sealing, disturbance of the hollow fiber bundle during fixing, and reliability of fixing. That is,
Although the temporary sealing part is a part that will be discarded when the module is completed, there was no choice but to incur material and processing costs for the temporary sealing process. Furthermore, it is difficult to determine whether the temporary sealing is being performed without any problems at the time of the temporary sealing, and it is only possible to determine whether the temporary sealing is good or not by observing the cut surface of the fixing part after the module is manufactured.

Furthermore, if this temporary sealing is defective, some of the openings of the hollow fiber membranes will be sealed with the fixing resin, making it impossible to secure the required membrane area for the module, and sometimes the manufactured module will have to be discarded as a defective product. Must be.

In addition, the method for storing all the hollow fiber bundles in a container requires that the hollow fiber bundles be neatly arranged and stored in the container, otherwise the hollow fibers in the peripheral areas will be disturbed and the ends of the hollow fibers will be disorganized. The problem was that the hollow fibers were buried in the fixing resin, making it impossible to use the hollow fibers effectively.

In addition, since the hollow fibers are used as a bundle, the hollow fibers are often filled with light relatively densely, and when fixing, it is difficult for the fixing resin to enter between the hollow fibers in the center of the hollow fiber bundle. There is a drawback that defective products are likely to occur due to defects.

[Means to solve all problems]

In view of the current situation, the inventors of the present invention have conducted intensive studies on a method for manufacturing a hollow fiber membrane module that does not have the above-mentioned drawbacks, and have arrived at the present invention.

That is, the gist of the present invention resides in a knitted fabric using a hollow fiber membrane for all wefts, in which the hollow fiber membrane is folded back without being cut at the edge of the knitted fabric. The hollow fiber membrane used in the present invention can perform separation, d':l filtration, gas-liquid contact, and ? ? This is a hollow fiber membrane used for X-liquid contact, etc. Any hollow fiber membrane can be used as long as it can be folded back without causing any sounds such as crushing or damage at the ears, but polypropylene and Polyolefin fiber hollow fiber membranes such as polyethylene are preferably used because of their flexibility.

The warp in the knitted fabric can be any warp that is used in ordinary knitted fabrics or woven fabrics, but it is preferable that the warp is not hard so as not to damage the hollow fiber membrane during production or handling of the knitted fabric. First, multifilament, spun yarn, processed yarn, etc. are preferably used. It is also preferable that the tension during knitting and weaving be relatively small.

The present invention will be explained below using the drawings.

Figures 1 to 3 are examples of the aIi&product of the present invention. In the figure, (1) is a weft made of hollow fiber membrane, and (2)
and (3) are warp threads. Figures 1 and 6 show the degree of the warp (2) in the selvage and the warp (3) in the area other than the selvage.
Figure 2 shows an example in which the warp density is uniform in the width direction of the knitted fabric. As long as optical shape stability can be maintained as a knitted fabric, warps other than the selvedges may not be present.

In the present invention, as mentioned above, it is preferable to reduce the tension of the warp, and for this purpose, it is necessary to select a knitting machine or loom, the coefficient of friction between the weft and warp, the yarn feeding method, the yarn guides, etc. It is necessary to comprehensively consider the selection of weaving conditions.

For example, in shuttle looms, the tube-wound weft yarn is pulled out in a loop shape, which tends to cause fraying, so it is necessary to take measures to prevent fraying. Considering this point, a shuttleless needle loom or the like is preferably used. Also, when it comes to knitting machines, warp knitting machines are preferable.
For example, it is preferable to knit it in tassels using a raschel knitting method.

As will be described later, the width of the knitted fabric corresponds to the length of the module, so the middle tone of the knitted fabric is set according to the size of the module to be manufactured. Note that the terminal portions of the first and last wefts of the hollow fiber membrane biased fabric must be sealed in advance. If it is 11 in the open state, it needs to be in the part that should be fixed with resin at both ends of the module when creating the module after this, otherwise it will leak when used as if there were a pinhole. This will cause problems.

[3 dings.

FIG. 4 shows the production of a module fixed at both ends using a knitted fabric in which the hollow fiber membrane according to the present invention is inserted into the weft. In the figure, (5) is a container in which the hollow fiber membrane is placed, and (6) is a container into which the hollow fiber membrane knitted fabric according to the present invention is bundled and inserted.

The folded part of the weft of the hollow fiber membrane knitted fabric is placed in the resin fixing jig (7), and is in a position where it will be embedded in the resin when the resin is injected from the resin injection port (8). be.

The shaded area (9) is the area in which the fixing resin is injected. After the fixing resin becomes sufficiently hard, remove the jig (7) and cut it at the dashed line (4) in the diagram. The folded weft n of the hollow fiber membrane fabric is set in a cylindrical container (11). In the figure, (10) is a part fixed with resin, and the fluid to be Pi4 enters from the (a) direction (and exits from the b+ direction).

This shows a manufactured module with a hollow part (16), and by making it into such a shape, the applications can be expanded. As shown in FIGS. 5 and 6, in the one-end fixed type module, it is necessary that the first and last hollow fiber ends of the weft threads are located in the resin to which they are fixed.

Figure 7 shows a slit-shaped module in which one piece of knitted fabric (18) according to the present invention is installed in a thin box-shaped storage container 9). The m of the present invention can be easily made by folding it and fixing one end entirely with resin as shown in figure m.
The figure shows a module in which the fluid enters the side L and exits in the vertical direction, but such a pleated module with both ends fixed can also be easily produced.

FIG. 10 shows a cross-sectional structure of a household water purifier using a fabric in which a hollow fiber membrane according to the present invention is inserted as a weft.

←There is an activated carbon layer (28) in the hollow part of the bow cylinder, and this activated carbon layer (28) absorbs odors and organic matter. Mayu Zuchu (29)
) is an O-ring-shaped box for changing the water flow path, and in Figure 10, raw water flows from the raw water inlet (30) to the treated water outlet (5).
1), the O-ring-shaped cell (29) passes through the treated water outlet (27), then passes through the pot-shaped space (33) at the bottom, and enters the activated carbon layer (28). The water flowing down the activated carbon layer (28) exits through the treated water outlet (31).

When the O-ring shaped box (29) is not in direct contact with the treated water outlet (32), raw water enters from the raw water inlet (30) and directly flows down toward the treated water outlet (31).

〔Example〕

The present invention will be explained in more detail below using Examples.

Example 1 Mitsubishi Rayon (1EHF 270 Hi 16 polyethylene hollow fibers made by ■) with an outer diameter of 390 μm was used as the weft, and polyester processed yarn (50 μm) was used as the warp.
d/24f)'ii.

The loom used was a needle loom (manufactured by Muller AG (West Germany)), the spindle rotation speed was set at a low speed of 200 revolutions/min, and the weft yarn, BHF270H, was fed directly from the bobbin. Two warp threads were inserted into each ear part, and no warp threads were used in other parts. The woven width was 1100a, and the woven narrow fabric with a width of 100 strips was subjected to hydrophilic treatment according to the following method. That is, after being optically immersed in an ethanol solution containing 5% propylene glycol monostearate,
The adhering liquid was dried continuously with hot air at 70°C. A 0.5rn'' hollow fiber membrane module obtained in the same manner as described above was prepared, and a water purifier having a shape as shown in Fig. 1o was obtained.

When a leak test and a water flow test were carried out using this water purifier, there was no leakage, and when water was passed under a pressure of 1 kg/cm", the permeated water fi:' was 1 8 t/min.

Example 2 The weft and warp were the same as in Example 1, the knitting machine was a Jacquard Russell machine, and the coarse gauge f
, 20 pieces per 2.54 cm, well gauge '5
2.54 (7) per 8 pieces. The warp was tufted, and the weft was inlayed with a width of 100 mm. Also 1
Of the 00 ugly cloth, all four warp threads in the ears were used, and the needles were removed from the other parts. In this way, a narrow knitted fabric with a width of 100 fl, in which each side of the la fabric was composed of four wefts, was obtained.

The thin cloth was affixed to an ethanol solution containing all propylene glycol monoester 71/-, and after dripping all the adhering liquid, the thread was made hydrophilic by continuous drying with hot air at 70°C. Complete module construction A water purifier with the shape shown in Figure 10 was manufactured. When I conducted a leak test and a water flow test using this water purifier, there was no leak.
The permeated water i of min is shown.

〔Effect of the invention〕

By using the knitted fabric of the present invention in which hollow fiber membranes are used as weft yarns and the hollow fiber membranes are folded back without being cut at the selvedges, the step of temporarily sealing the ends of the hollow fibers, which was conventionally required during module production, can be eliminated. This becomes unnecessary, and it becomes possible to fix the hollow fiber bundle neatly and reliably without disturbing it. Furthermore, since it is a knitted fabric, it is easy to handle and has the advantage of being able to diversify module shapes.

Further, when the knitted fabric according to the present invention is used, conventional dyeing and finishing machines can be used to efficiently carry out post-processing. For example, in order to use a hydrophobic hollow fiber membrane for aqueous applications, post-treatment with a hydrophilic agent (hydrophilic treatment) is required, but conventionally, after fixing the hollow fiber membrane in a container, Since the product was made by drying, uniform processing was difficult due to migration during drying. In contrast, the fabric of the present invention can be processed, for example, in a conventional beam dyer and hot air dryer, in its state before being fixed in a container. That is, by producing a product in which the hollow fiber membrane according to the present invention is inserted into the weft, the conventional module manufacturing process, which is heavily colored by manual labor, can be made into a rational mass production process.

[Brief explanation of the drawing]

FIGS. 1, 2, and 3 are examples of knitted fabrics in which hollow fiber membranes are inserted in the wefts according to the present invention. FIG. 4 is a partial cross-sectional view of the process of forming a bundle of fabrics in which hollow fiber membranes are inserted into the wefts according to the present invention to form a module with both ends fixed. 5, 6, 7, 8, and 9 are examples of modules of various shapes that can be made using the knitted fabric in which the hollow fiber membranes are fully inserted into the wefts according to the present invention. 1... Weft yarns 2 and 3 made of hollow fiber membranes... Warp yarns 4... Cutting section 5...
... Hollow fiber membrane storage container 6 ... Hollow fiber membrane knitted fabric 7 ... Resin fixing jig 8 ... Resin pressure inlet 9 ... Injected resin 10. 17, 20, 25 and 26...Resin fixing part membrane knitted fabric 14...Cylinder of hollow cylindrical container 15...Outer cylinder 16 of hollow cylindrical container...Hollow part 18 .21 and 24...Hollow fiber membrane knitted fabric 19.2
2 and 25...Hollow fiber membrane storage container 27...
・Hollow fiber membrane filtration layer 28...Activated carbon packed bed 29...0 ring-shaped square 3o...Raw water inlet 31...Treated water outlet 32-...Treated water Derivation part 33...Catch-shaped space part 34...Huan Xuan Determining part Patent applicant Mitsubishi Rayon Co., Ltd. Tail 1 Diagram 2 Diagram Tail 8 Concave↓ 10th item

Claims (1)

[Claims] A knitted fabric using hollow fiber membranes as wefts, the hollow fiber membranes being folded back without being cut at the edges of the knitted fabric.