JPH03106423A - After-treatment method for micro-porous film and spacer sheet for after-treatment - Google Patents

Abstract

PURPOSE:To attain treatment effect without unevenness by winding a prepared micro-porous film of long R sheet-shape in a manner of forming and retaining a space continued in the winding direction by means of spacers, forming the same in the rolled shape and after-treating said micro-porous film. CONSTITUTION:A micro-porous film 1 of long R-sheet shape is wound by means of spacers 2a and 2b of a spacer sheet 2 in a manner of forming and retaining a space 6 continued in the winding direction, forming the same in the rolled shape and after-treating the micro-porous film 1. As the result, the treatment time can be shortened and treatment effect can be attained without unevenness.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] This invention relates to a method for post-processing a microporous membrane and a spacer sheet for post-processing. [Conventional technology] Microporous membranes are used for sterilization and clarification of beer, wine, sake, etc., sterilization of injection drugs and infusions, inspection and analysis of microorganisms, sterilization and particle removal of various types of water, and air sterilization. It is used in many fields that require high-precision filtration, such as removing dirt and bacteria. Specific examples of microporous membranes include ultrafiltration membranes and microfiltration membranes, but needless to say, they are not limited to these. The same microporous membrane is produced by, for example, dissolving a material polymer in a solvent, casting this solution (dope) onto a casting table (support plate), and then using a non-solvent for the polymer (which is miscible with the solvent). Polymers are made by a wet method, in which a film is obtained by immersing the polymer in a coagulation bath consisting of a solvent that does not dissolve the polymer. The pores of the microporous membrane obtained by the above-mentioned wet method generally have small pore diameters on the surface of the membrane, and larger pores from the inside of the membrane toward the surface (back surface) in contact with the casting table. Or, the surface of the membrane has fine pores, but from the inside to the back side, there are large, slender, finger-shaped pores, so-called "anisotropic".
have. The water permeability of a microporous membrane is mainly controlled by the layer with small pores on the membrane surface, so a membrane with the above-mentioned anisotropy has the ability to trap particles, etc.
Shows relatively high water permeability.

By the way, the above-mentioned solvents and the like are dissolved in the formed microporous membrane, and if this is left as is, for example, these impurities will later dissolve into the filtrate, causing problems. As a countermeasure against this, it is customary to remove these impurities by cleaning after film formation. [Problems to be Solved by the Invention] Conventionally, as the cleaning method, only the microporous membrane after film formation is wound into a roll shape, and the roll shape is left immersed in a processing solution. method was adopted. With this method, the inner membrane and outer membrane of the wound microporous membrane are almost in close contact with each other, or they are wound loosely so that there is a gap between the membranes. However, in the radial direction of the roll, it is inevitable that there will be areas that are tightly packed and have almost no gaps, and as a result, the processing liquid will not be able to spread quickly and thoroughly throughout the microporous membrane. As a result, processing took a long time and the processing effect became uneven. In view of the above circumstances, it is an object of the present invention to shorten the processing time and obtain uniform processing effects. Such problems are caused by glycerin impregnation treatment performed to keep the microporous membrane in a wet state, surfactant adhesion treatment to impart hydrophilicity to the hydrophobic membrane, drying treatment after washing, and glycerin impregnation treatment. The same applies to post-treatments such as drying treatment.

[Means to solve the problem]

In order to solve the above-mentioned problem, a microporous membrane post-treatment method according to the invention according to claim 1 includes forming a continuous gap space in the winding direction of the produced long sheet-like microporous membrane using spacers. Wrap it in a roll shape so that it holds the precepts,
The same microporous membrane is post-treated. In the microporous membrane post-treatment method according to the second aspect of the invention, spacers are arranged on both sides of the microporous membrane in the width direction. The spacer sheet for post-processing according to the invention according to claim 3 is wound into a roll together with a long sheet-shaped microporous membrane made into a paper, and there is a continuous gap in the winding direction between the microporous membranes. This is a spacer sheet for post-processing that maintains the shape of the space, and is a long sheet similar to the microporous membrane described above, and has protrusions along both sides of the sheet width direction that serve as spacers for gap-shaped control. A section has been established. [Function] A spacer is used between the crotches of a long sheet-like microporous membrane.
I! ! ! By maintaining a continuous gap space along the winding direction, the processing fluid can quickly and efficiently flow across the entire membrane.
It will be distributed evenly. A spacer sheet for processing that is wound into a roll together with a long sheet-like microporous membrane and maintains the shape of a continuous gap space between the same microporous membranes in the membrane winding direction, By using a spacer sheet, which is a long sheet similar to a microporous membrane and is provided with protrusions that serve as spacers for forming gaps along both sides in the width direction of the sheet,
To quickly and easily form and maintain the interlayer spacing when carrying out the above post-processing method. (Example) This invention will be explained in detail below with reference to the drawings showing the example.This invention is not limited to the following example. This figure shows an embodiment of the present invention taking a treatment as an example. In this embodiment, a microporous membrane 1 is used together with a post-treatment spacer sheet (hereinafter referred to simply as a "sheet") 2. The figure shows an example in which it is wound into a roll shape.The microporous IQ 1 is made as described above so that the width W1 is 204 mm, the length is 40 m, and the FJ thickness is 111 nm. The membrane is formed as follows.Microporous membrane】
For details on the manufacturing process of, for example, dope, polymer,
The spacer sheet 2 has a width w. which can be according to known methods regarding solvents, added swelling agents and/or non-solvents, casting tables and coagulation baths, etc. and the length is the same as that of the microporous membrane l, and the thickness t is 18 Bpm.
It has become. The sheet 2 is preferably made of a material that has just the right hardness to be easily handled during rolling, is inexpensive, and has both heat resistance (this performance is passed during drying, etc.) and corrosion resistance. For example, PET(
It is preferable to use polyethylene terephthalate as the material. It is not limited to this. sheet 2
In this case, three rows of protrusions, which serve as spacers, are integrally formed at both ends in the width direction of the seat body, which serves as a support body. As shown in FIG. 2, these protrusions consist of protrusions 2a shown by black circles and protrusions 2b shown by white circles. As shown in the figure, the protrusion 2b is directed downward (in one direction), and the protrusion 2b is directed upward (in the other direction). These protrusions 2
a..., 2b... are each part of a spherical surface of approximately 5-φ, and have a height h of 1 to 1. m = 5.0 m from the widthwise side edge of the sheet 2.
One row is arranged at the position of 0 m-, and two rows are arranged at a distance of a certain pitch p (7.5 mm) on the inner side, and these 2a..., 2b... It is an array. Such protrusions 2a..., 2b
... are provided so as to span the entire length of the sheet 2 in the longitudinal direction (winding direction). These microporous 115! 1 and sheet 2, as shown in the same figure, with sheet 2 on the inside (or outside is OK) and the ends aligned. The microporous membrane 1 and sheet 2
As shown in FIGS. 1 and 5, the wire is wound so that its inner peripheral end is on the outer periphery of a winding core 13 of a cleaning device 1O, which will be described later. Although this winding is carried out on a horizontal axis, it may also be wound on a vertical axis or an inclined axis. At this time, at one end of the winding core l3, a perforated plate (
Alternatively, a horizontal plate) 14 may be attached. The roll 5 on which the microporous membrane 1 and the sheet 2 are wound is the sixth
As shown in the figure, the diameter D is around 340 mm. FIG. 7 shows an enlarged view of the roll 5 as viewed from the axial direction. As shown in the figure, the inner and outer microporous membranes 1.1 are separated by a sheet 2, and this separation is as follows.
are obtained by the protrusions 2a..., 2b..., thereby forming a microporous membrane l. 1, as shown in the cross section in FIG.
A gap space of 6.6 meters (theoretical value) is designed to maintain its shape. This gap space 6.6 of a certain size is continuous in the winding direction of the microporous membrane 1. Note that the roll 5 has a fastener (not shown) at its outer peripheral end.
It can be stopped with . The roll 5 is cleaned, for example, by a cleaning device IO shown in FIGS. 9 to 11. The device 10 includes a tank l1 with an open top end, and an inlet 16a of a circulation pipe 16 equipped with a pump l2 and a particle removal filter 15 communicates with the bottom of the tank l1. A plurality of outlets 16b of the pipe 16 face above the opening of the tank 1l. In addition to the outlet l6b,
A pipe 18 is provided above the tank 11 into which replacement water 19 is poured. In the tank 11, a plurality of rolls 5, for example, three rolls 5 wound around a winding core 13 can be installed. The lower end of the winding core l3 of the roll 5 is inserted into the center hole of a support plate (SUS) 14 equipped with a flange with holes 14a and a mounting tube 14b, and the screw 14
C is fixed to the support plate l4, and this is placed in the tank 11 as it is so that the mounting cylinder 14b of the support plate l4 is placed on the bottom wall of the tank 1117)'. After that, the water supply tray 20 is moved to the winding core l3.
It is installed on top. The supporting plate l4 may be fixed to the winding core l3 and then wound to form a roll, or the reverse may be used.
The core with the roll attached to the support plate l4 may simply be placed under the circulation vibe outlet 16b and the outlet of the displacement water l9 pipe l8. A socket may be provided at the bottom of the tank 11 into which the end of the winding core is inserted. The rolls 5 are set in the tank 11 while being wound around the winding core 13 as described above, or
It may be extracted from the winding core (not shown) and separately fitted onto the outer periphery of the winding core l3. The roll 5 may be set on a horizontal axis or on an inclined axis depending on the washing water supply method. At each upper end of the winding core l3, a water supply tray 20 into which circulating cleaning water 17 and replacement water l9 are poured, connects the bottom protrusion 20c of the tray 20 to the winding core 1.
It is set by fitting it into the upper end of 3. The water supply tray 20 is made of acrylic with an outer diameter slightly larger than 340uφ, and the bottom has two types of holes 20a: a large hole (3.5 amφ) and a small hole i (3mφ). , 20b... are opened so as to pass through. The holes 20a... are arranged radially in one row in the radial direction, and the holes 20b... are arranged radially in two rows facing in the radial direction and between the holes 208, 20a. It has been done. There are 60 holes 20a and 120 holes 20b. Hole 20a
, 20b are opened almost evenly over the entire surface of the water supply tray 20. After the rolls 5 are vertically placed in the cleaning device 20, cleaning water is supplied through the pipes 18 (or a dedicated water supply pipe may be used). This washing water is first poured into the water supply tray 20... and is also poured into the hole 2.
It falls through 0a..., 20b... These cleaning waters flow down onto the rolls 5 as indicated by the arrows in Figure 9, pass between the protrusions 2a, 2b, and so on in the rolls 5, and flow into the gap spaces 6. Furthermore, the protrusion 2a at the lower end
..., 2b... The holes 14a of the perforated plate 14 are inserted between the holes 14a...
・Flows down into tank II. In the tank 11, the wash water 21 gradually accumulates, and even if the wash water 2l exceeds the upper end of the drain pipe 23 as shown by the dotted line in FIG. It will be maintained at the level. At the same time, the circulation pipe l
2 liters of cleaning water in tank 1 is extracted through outlet 1
6b... is poured into the water supply tray 20... together with the replacement water 19 as circulating water 17. @Since there is a gap space 6 continuous in the winding direction between the inner and outer microporous membranes 1.1, the cleaning water flows through the protrusion 2.
A..., 2b... all come into contact with the surface of the microporous membrane 1 and perform a cleaning action except for certain locations.
After the cleaned roll 5 is pulled out above the core (in some cases, after undergoing necessary treatments such as glycerin treatment and drying), the protrusion of the sheet 2 is removed as shown in FIG. By cutting and removing both sides 2c, 2c in the width direction, which were in contact with 2a, 2b, . . ., only the central portion 2d can be effectively used as a microporous membrane. The microporous membrane post-treatment method and spacer sheet according to the present invention are not limited to those described above, but may be as follows. The spacer sheet 25 shown in FIG. 13 has projections 25a..., 25b... arranged in a row on both side edges of the spacer sheet 25. The same protrusion 25a..., 25
b... do not all protrude in the same direction, but as shown in the same figure, those 25a. If the sheets 25b are made to protrude in opposite directions, a gap will be formed on the front and back sides of the sheet 25, allowing for efficient cleaning. The spacer sheet 27 shown in FIGS. 14 and 15 is
Only both ends of the sheet 27 in the width direction are integrally molded to form a wave shape when viewed from the side, and are provided with protrusions 27a, 27b, etc. that alternately protrude from the front and back surfaces of the sheet 27. ing. The spacer sheet 30 shown in FIG.
A separate wave-shaped spacer piece 31 is provided by adhesive or the like on the front and back surfaces of both side edges of a sheet main piece 32 serving as its support, and each spacer piece 3l is shaped like a wave, The protrusions 31a of the waves serve as spacers. In this case, the separate spacer piece may be a corrugated spacer piece 32 with a base diameter as shown in FIG. 17, or a spacer piece having a hemispherical projection 33a as shown in FIG. It may also be piece 33. Further, as shown in FIG. 19, a separate semicylindrical piece 36 that will become a spacer is attached to the sheet main piece 32 as a spacer piece 37, as shown on top of the narrow strip 35. Alternatively, as shown in FIG. 20, semicylindrical pieces 40... can be directly pasted on both side edges of the 390 sheet pieces to form the base sheet 1-41.
may be configured. The semicylindrical piece 40 may have nine shafts (a perfect circular shaft piece). In each of the embodiments shown in FIGS. 16 to 20, if the protrusions protrude from both sides of the spacer sheet, the protrusions form and maintain a gap between the inner and outer microporous membranes. FIG. 21 shows that by integrally forming various protrusions 43a as described above on both side edges of the microporous membrane 43 itself, a constant gap can be maintained between the inner and outer membranes without a spacer sheet. This shows an example that makes it possible. In the above description, the protrusions are arranged on both side edges of the sheet main piece, but for example, the protrusion facing in the longitudinal direction may be arranged at the center position of the sheet main piece in the width direction. Further, the protrusion may be formed, for example, by making cuts in the width direction of both side edges of the sheet and bending the sheet in one direction between the cuts.

In the cleaning process shown in FIG. 45 is the 9th
Using a roll similar to the one shown in the figure, each roll was supported by a perforated plate 47 and held by a winding core 48 inside the same tank 46 (a spacer sheet was wound in the same way).
49 is installed, and cleaning water 50 is stored in the tank 46 at a constant level using a water supply pipe 46a, and the rolls 49 are moved reciprocally in the vertical direction. In this case, when the rolls 49 are lifted up, the cleaning water in the gap space completely (or only partially) escapes and flows down, and when the rolls 49 are put back into the cleaning water after that, the cleaning water remains non-existent. It is best to make sure that all the washing water can be replaced; this way,
Cleaning can be done quickly and effectively. As another cleaning method, in the embodiment shown in FIGS. 23 to 25, the spacer sheet 51 has rubber bands (or resin bands) 52 . The protrusion serves as a spacer. This sheet 51 is inserted into the vertical slit 56.5 along with the microporous membrane 53.
6 is wound around a shaped core 57 to form a roll 54, and after the winding end is tightened with a band 60 with a hook 60a so as not to unravel, this is installed in a cleaning device. As shown in FIG. 25, the band 60 is tightened so as to pass through the center of the width of the rubber band 52, but at this time, a gap C is created between the inside and outside of the band 6o and the rubber band 52. The tightening becomes partially loose. For this reason, a rubber 6l made of the same material as the rubber band 52 is applied within the gap C to eliminate any leakage in tightening. The cleaning water from the core 57 flows through the vertical slit 56.
The cleaning water is introduced into the gap space 58 from the inner circumference of the roll 54 through the space 56, and the cleaning water can be guided through the space 58 to circulate inside the roll 54 from the inner circumference to the outer circumference.

In addition, after forming the roll 54 without using the core 57, the core 57 with vertical slits 56 and 56 is inserted into the hole 55 in the center of the roll 54, as shown in FIG. After that, it may be installed inside the cleaning equipment. Note that if the protrusions are point-shaped, the cleaning water can be conducted not only in the axial direction of the roll but also in the circumferential direction.

A plurality of rolls may be arranged in series in the longitudinal direction. The roll may be rotated for cleaning.

In addition, even if the roll is immersed in the processing liquid as in the past, there is sufficient space between the films, so compared to the conventional method, the roll can be quickly and evenly processed. I can do it.

Additionally, during drying, a fluid such as hot air is usually passed between the membranes. As in the post-processing method of the present invention, if a sufficient distance is secured between the films by the spacer, there is no contact between the film surfaces and there is no risk of damage to the films. Next, a more specific example will be described - Example 1 - To prepare a microporous membrane, polyether sulfone 18.
Offi parts and brobylene glycol l O. 0 parts by weight was added to 72.0 parts by weight of dimethylformade, and the dope was prepared by stirring and dissolving at room temperature.
Keep it at 5℃ and then cast it onto a long PET hand-woven fabric with a diameter of 250 μm.
After passing through the blade coater in the gap, it was put into the water. Afterwards, the membrane was taken out of the water and wound up into a roll. The obtained microporous membrane had dimensions as shown in FIG.
0m, thickness t. I set it to 177n. The spacer sheet is
Using PET, the dimensions as shown in FIGS. 1 to 4 and the above explanations corresponding to these figures, that is, the width W, is 20.
4n, the length was 49m, the thickness t was 188n, and the same sheet had three rows of protrusions at each end in the width direction. These microporous membranes and sheets were wound together to have a diameter of 340 as shown in Figure 6, and washed with water using a cleaning device as shown in Figure 9. The remaining amount of solvent etc. before washing with water and the remaining amount after washing with water are each 0.045n? It was cut and extracted with ethanol at 60°C x (ihr) and measured by gas chromatography.The water flow rate was adjusted to 2.
cta/sec and lhr water wash. As a result, the remaining amount of solvent, etc. before washing with water was 3650 mg, 13700 mg,
The amount was 3650 mg, but after washing with water, the remaining amount was 341 g.
The doses were 33mg and 30mg. -Example 2- This example corresponds to the one shown in Fig. 22, in which the rolls were slowly reciprocated up and down. The up and down reciprocating movement is carried out by lifting the roll by hand once every 5 minutes. When lifting, keep it in the lifted state to remove all the water from the roll, and then immerse it in washing water again to remove it from the roll. This was done in such a way that the water was completely replaced with each up and down movement. Other conditions were the same as in Example 1 above. the result,
The remaining amount of solvent, etc. before washing with water is 365 (leg, 3700 + @ g, 36
50n+g, but after washing with water, the remaining amount was 76mg17
0mg, 80mg.

Example 3 A flat spacer sheet body made of PET (20 4 m
mX 40mx 188n) on the front and back sides of both sides (
Prepare a spacer with silicone rubber pasted on it measuring 49mm x 40m x 2mm). Two slits (10 mm x 200 mm) are provided in the core 57 (outer diameter 89-1, length 300 mm) in FIG. 24, and one end of the film formed in Example 1 is fixed between the slits and the slint. The above spacer is fixed and wound around the other part, and the end of the winding is tightened with a ring-shaped metal fitting to prevent it from unraveling.Then, the spacer is placed in a cleaning device, and from the core 57 l, 'l l /s
Washing water of 1.5 in. is introduced and flows on both sides of the membrane through two slits. The flow rate was 5csa/SEC. After washing with water for 1 hour, the remaining amount after washing was measured in the same manner as in Example 1.
Inner peripheral part, middle part, outer peripheral part, each 15 mg, 20
n+g, 28 mg. Comparative Example 1 - The microporous membrane of Example 1 wound into a roll was placed in the cleaning device shown in Fig. 9 and immersed for 1 hour to determine the amount of solvent remaining in the middle part. We performed measurements. The remaining amount before washing was 3700 mg/r as in Example 1 above.
d, but the remaining amount after cleaning was 2000 m
A very large amount of g/rd remained.

Example 4 - A - Glycerin Treatment While the cleaned membrane obtained in Example 1 was placed in the apparatus,
The water in the apparatus was drained and a 60-t% glycerin aqueous solution was injected and circulated for 2 hours.

The crotch may be removed and made into a new roll with a spacer sheet, or the roll may be moved to another device.

After the circulation process is completed, the roll is taken out, and the film is cut by lQcsXIQcm from the inner circumference (third turn from the innermost circumference), middle section, and outer circumference (third turn from the outermost circumference) of the roll.

Thoroughly wipe off the droplets on the front and back sides of the membrane with filter paper, etc., and dry it at room temperature for 24 hours. The glycerin impregnation rate (glycerin weight 1 relative to the dry membrane weight) is determined from the weight of the glycerin-containing membrane after drying and the dry membrane weight after glycerin removal.
%, middle part 50%, outer peripheral part 50%, and quick and uniform processing was possible. B - The dried glycerin-treated membrane was placed in a clean bench with the roll vertically placed and dried at room temperature while blowing air from above so that air flowed through the gaps above the membrane surface. After drying for 24 hours, the inner circumference of the roll (3rd turn from the innermost circumference),
1 each from the middle part and the outer periphery (3rd lap from the outermost periphery)
Cut the membrane at 0c@xlOcm and measure the weight. Thereafter, the membrane is dried again at room temperature for 24 hours, and the amount of ffi is measured to determine the weight loss rate. The heavy N reduction rate is 3.6 at the inner circumference.
%, the middle part was 2.9%, and the outer peripheral part was 3.5%, indicating that quick and uniform drying was possible.

- Comparative Example 2-A - Glycerin treatment The cleaned membrane obtained in Example 1 is wound without a smoother 6
It was immersed in a 0 wt % glycerin aqueous solution for 2 hours in a static state. After the treatment, as in Example 4, the glycerin-containing film in the inner, middle, and outer peripheral parts was found to be 7% in the inner peripheral part and 6% in the middle part.
, only 38% of the outer peripheral area was processed, which was insufficient and uneven.

B-Drying The glycerin-treated membrane obtained in Example 4 was unrolled, and the membrane alone was rerolled and dried at room temperature for 24 hours. After drying, the weight loss rate was determined using the same method as in Example 4: 26% in the inner circumference, 22% in the middle, and 11% in the outer circumference.
This resulted in insufficient and uneven drying. Example 5 - To prepare a microporous membrane, polyether sulfone l1.
Part Oii and 58.0 parts by weight of polyoxyethylene octylphenol ether were added to 31 parts by weight of dimethyl sulfoxide.
．． A dope was prepared by adding 0 parts by weight and stirring and melting at 30°C.

This dope was cast onto a mirror-like stainless steel belt kept at 45°C, passed through a 300 # gap blade coater, and then passed through air at 25°C and 80% RH for 5 minutes. Then, it was put into the water. After that, the coagulated film was peeled off from the stainless steel belt, taken out of the water, and wound up into a roll. The obtained microporous membrane was washed with water in the same manner as in Example 1, and then immersed in an aqueous solution of 0.1 parts by weight of a nonionic surfactant (Aergen 810 manufactured by Kao) for 1 hour while being rolled together with a spacer sheet. did. Thereafter, the roll was taken out of the solution and dried in a clean bench for 24 hours to obtain a hydrophilic microporous membrane. Sample the inner, middle, and outer parts of this membrane,
When the membrane was placed horizontally and a drop of water was dropped on it, it took 3 seconds for all the water droplets to be absorbed. From this, it is clear that uniform and sufficient hydrophilization is occurring.
I could recognize it.

As shown in the above examples, the effects of cleaning, glycerin treatment, and drying of the microporous membrane are significantly higher than those of the comparative examples.

〔Effect of the invention〕

Since the microporous membrane post-treatment method according to the present invention is structured as described above, the treatment time can be shortened and the treatment effect can be uniformly obtained. Further, by using the spacer sheet, it is possible to quickly and easily form and maintain the inter-film spacing when carrying out the above-mentioned post-processing method.

[Brief explanation of drawings]

Fig. 1 is a perspective view showing an embodiment of the microporous sheet post-treatment method and spacer sheet according to the present invention in a rolled state, Fig. 2 is a front view of the sheet, and Fig. 3 is a protrusion of the sheet. FIG. 4 is an enlarged cross-sectional view of the protrusion, FIG. 5 is a perspective view showing the roll support means of the cleaning device, and FIG. 6 is a microporous membrane and sheet wound into a roll. Figure 7 is an enlarged view showing the state in which the sheet is sandwiched between the microporous membranes and wound on the same roll, and Figure 8 is a perspective view showing the state in which the sheet is wound between the microporous membranes. FIG. 9 is a cross-sectional view showing an example of the cleaning device, FIG. 10 is a front view showing the same roll support means taken out, FIG. FIG. 13 is a front view showing another embodiment of the sheet, FIG. 14 is a perspective view showing another embodiment of the sheet, and FIG. Fig. 14 is a side view, Figs. 16 to 20 are perspective views showing an embodiment in which the protrusions are formed on the sheet using separate pieces, and Fig. 21 is a side view showing an embodiment in which the protrusions are formed on the microporous membrane itself. FIG. 22 is a perspective view showing an embodiment in which the rolls are reciprocated up and down in the cleaning device;
Figure 3 is a perspective view showing an embodiment in which cleaning water is passed through the roll in the circumferential direction, Figure 24 is a perspective view showing the core for water supply, and Figure 25 is the roll shown in Figure 23 tightened with a band. FIG. 1.43.53...Microporous membrane 2.25.2730
．． 41.51... Spacer sheet for post-processing 2a. 2b
．． 25a. 25b, 27a, 27b, 31a, 33a,
40.43a, 52...Protrusion (part that becomes a spacer)
5.54...Roll 6.58...Gap space

Claims (1)

[Scope of Claims] 1. A long sheet-like microporous membrane produced is wound into a roll shape using a spacer so as to form and maintain a continuous gap space in the winding direction, and the same microporous membrane is rolled. A method for post-processing a microporous membrane to perform post-processing of the membrane. 2. The microporous membrane post-treatment method according to claim 1, wherein the spacers are arranged on both sides of the microporous membrane in the width direction. 3. A spacer sheet for post-processing that is wound into a roll together with a long sheet-shaped microporous membrane produced, and forms and maintains a continuous gap space in the winding direction between the microporous membranes, A spacer sheet for post-processing, characterized in that it is a long sheet similar to the microporous membrane described above, and is provided with protrusions that serve as spacers for forming gaps along both sides of the sheet in the width direction. .