JPH11319427A - Laminated pleat filter - Google Patents

Laminated pleat filter

Info

Publication number
JPH11319427A
JPH11319427A JP13292798A JP13292798A JPH11319427A JP H11319427 A JPH11319427 A JP H11319427A JP 13292798 A JP13292798 A JP 13292798A JP 13292798 A JP13292798 A JP 13292798A JP H11319427 A JPH11319427 A JP H11319427A
Authority
JP
Japan
Prior art keywords
filter
gel
substance
outer layer
gel substance
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP13292798A
Other languages
Japanese (ja)
Inventor
Mikio Ito
幹夫 伊東
Original Assignee
Roki Techno Co Ltd
株式会社ロキテクノ
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Roki Techno Co Ltd, 株式会社ロキテクノ filed Critical Roki Techno Co Ltd
Priority to JP13292798A priority Critical patent/JPH11319427A/en
Publication of JPH11319427A publication Critical patent/JPH11319427A/en
Pending legal-status Critical Current

Links

Abstract

PROBLEM TO BE SOLVED: To effectively remove a gel substance as well as to extend a filtering life by forming a pleated filter as an outer layer in such a manner that the pressure loss is smaller than a specified value and that the slopes of the valley part of the pleats are formed to have a gigging or ciliary structure to remove a gel substance. SOLUTION: A pleated filter 2 which acts as a precision filter of an inner layer and a pleated filter 3 as an outer layer to remove a gel substance are successively wound around a cylinder 1 having holes, which is housed in a porous cylinder 4. The pleated filter 3 as the outer layer consists of a base body 6 which is gigged to have fine fibers 7 and passage holes 8 are formed at the top of the valley part of the pleats. The passage hole 8 is formed to give <=0.3 kg/cm<2> pressure loss. Thereby, a gel substance is the fine fibers 7 without pressure. The liquid to be filtered passes through the hole 8 while the gel substance is trapped by the fibers 7. It is preferable that the fine fiber 7 gigged or preliminarily formed as a ciliary structure has 5 to 50 μm diameter.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a laminated pre-filter capable of effectively removing a gel-like substance and having a long filtration life.

[0002]

2. Description of the Related Art Liquids contain more or less colloidal substances, so-called gel-like substances, except for some liquids such as pure water and ultrapure water. This gel-like substance may be present in the liquid if there is no problem with the function of the liquid, but generally it is overwhelmingly desired to remove it together with the particles.

[0003] On the other hand, the necessity of removing particles in a liquid tends to increase with the sophistication of the industry, and the particle size to be removed is becoming smaller every day. For this reason, the coarseness of the filter material, that is, the surface matrix, is gradually becoming finer.

As described above, when the matrix becomes smaller,
The filter material has a short filtration life by closing the surface of the filter medium as if the gel-like substance was painted.

On the other hand, a so-called pleated type filter is frequently used as a method for securing a wider surface area of a filter medium in order to prolong the filter life.

However, even if the filtration area is widened in this way, the gel material in the liquid causes the surface of the filtration material to be closed, causing an increase in pressure loss within a short period of time. Often leads to life up.

To solve such a problem, Japanese Patent Laid-Open No.
Japanese Patent Publication No. 213814 discloses that one cartridge is provided with two layers, a depth layer and a pleated layer, and a gel layer is removed from the depth layer and fine particles are removed from the pleated layer.

[0008]

In order to remove a gel-like substance from the beginning, as described in the above-mentioned publication, a thick filter having a thick filtration layer called a depth filter is used. The idea is to try to remove the gel by passing through.

However, when a physical force is applied to the gel-like substance, the gel-like substance easily exhibits a tearing phenomenon, and has a property of temporarily breaking its shape and flowing out.

Therefore, when the gel-like substance is removed by the method described in the above-mentioned publication, the depth layer has a small surface area of the filter, so that not only the clogging is fast, but also the gel-like substance becomes shaped as described above. Change it and wash away in the subsequent stage, close the fine matrix of the pre-filter in the subsequent stage,
There is a problem that the filtration life is shortened.

According to the present invention, a layer for removing a gel-like substance and a layer for removing fine particles are separately provided in one filter cartridge to not only effectively remove the gel-like substance but also extend the filtration life. It is an object to provide a filter cartridge.

[0012] The structure of the present invention to meet the above-mentioned object is to laminate an outer layer pre-filter which mainly removes a gel-like substance on an inner layer pre-filter which functions as a normal filter, and to form the outer layer pre-filter. The filter has a pressure loss of 0.3 kg / cm 2 or less and has a raised or cilia portion for removing a gel-like substance on a slope of a valley of pleats.

In short, the present invention reduces the pressure loss to 0.3 kg
/ Cm 2 or less to prevent the gel-like substance from changing its shape and flowing away, and also to provide a raised or cilia portion for removing the gel-like substance on the slope of the valley of the pleat, so that the pressure loss is reduced. The gist of the present invention is that the gel-like substance can be effectively captured even if the size of the gel is reduced.

Next, an embodiment of the present invention will be described with reference to the drawings. FIGS. 1 and 2 show an embodiment of the present invention, in which a perforated cylinder 1 has a pleated filter 2 serving as an inner layer microfiltration filter and a pressure loss of 0 to remove a gel substance in an outer layer. A pleated filter 3 of not more than 0.3 kg / cm 2 is sequentially wound, and these are accommodated in the porous cylindrical body 4. Plates 5 and 5 'are fixed to the upper and lower sides of the porous cylindrical body 4.

As shown in FIG. 3 and FIG. 4, the outer layer pleated filter 3 has fine fibers 7 raised on a base material 6, and a flow path hole 8 is formed at the tip of the valley of the pleat.

The flow passage hole 8 has a pressure loss of 0.3 kg / cm.
It is formed so as to be 2 or less. In such a state where no pressure is applied, the gel-like substance is held by the fine fibers 7.

As shown by the arrows in FIG. 3, the liquid to be filtered passes only through the flow path holes 8, and the gel-like substance is captured by the fine fibers 7. FIG. 6 shows how the liquid flows when a conventional pleifilter is used. As shown by the arrows, the liquid passes over the entire surface of the filter medium.

Although the substrate 6 does not have a filtering performance in the above embodiment, it may have a filtering performance as shown in FIG. This is because the pressure loss is small even if it has the filtering performance, so that a pressure for changing the shape of the gel-like substance to pass therethrough is not applied, and the gel-like substance is captured by the fine fibers 7.

As shown in FIG. 5, a substrate having a nonwoven fabric-like filtration performance may be raised, or a substrate which has been raised in advance may be used.

Further, as shown in FIG.
The nonwoven fabric 10 having a weight of 3 kg / cm 2 or less and having a lot of fluffy (cili) 7 ′ can be used as it is. The cilia 7 'need only be formed on the outer surface, but may be formed on both the inner and outer surfaces as shown in FIG.

FIG. 7 shows a normal nonwoven fabric. Cilia 7 'capable of trapping a gel-like substance under the condition that a liquid passes therethrough with a pressure loss of 0.3 kg / cm 2 or less and almost no pressure is applied. If the nonwoven fabric has a nonwoven fabric, it can be used in the present invention.

The thickness of the fine fibers raised in the present invention and the cilia previously provided is preferably 5 to 50 microns.
If the thickness is smaller than this, the hairs stick to the base material and the function of removing the gel-like substance is reduced. If the thickness is larger than this, the hair cannot be raised densely, and the function of removing the gel-like substance similarly decreases.

The pleifilter 3 for removing the gel substance in the outer layer may be formed in a plurality of stages. Depending on the liquid to be filtered, one or a plurality of stages may be selected so that the gel-like substance hardly flows into the inner layer pre-filter 2.

In the above embodiment, the outer layer of the pre-filter 3 is laminated on the inner layer of the pre-filter 2 via the filter medium 9, but it may be laminated directly.

In practice, the pleats of the inner layer and the outer layer of the filter are very finely folded and slightly meandering. Are not fitted. In addition, as long as there is no obstacle to filtration, it is of course possible to laminate the layers via a tape or the like having no filtration performance.

The length of the fine fibers or the like to be raised differs depending on whether the pleated filter 3 has one stage or multiple stages or the density of the fine fibers or the like. good.

As the inner layer of the pre-filter 2, a conventional conventional pre-filter may be used according to the liquid to be filtered.

According to the present invention, almost no pressure is applied to the pre-filter 3 for removing the gel-like substance.
The gel-like substance is effectively trapped in the raised or cilia of the pleated slope.

Accordingly, almost no gel-like substance flows out to the pleifilter 3 which plays the role of microfiltration, so that the filtration life can be greatly improved.

The pleated filter 3 for removing a gel-like substance according to the present invention is different from a conventional filter medium in that a liquid is passed through the entire surface of the filter medium and is flowed to the back side to remove the gel with a matrix of the filter medium. The gel-like substance is removed by bringing a liquid into contact with the raised or cilia.

Since the pressure loss is 0.3 kg / cm 2 or less, the gel cannot be substantially removed without raising or cilia. Such a gel removal method has never been known before, and the present inventors have proposed:
It was first conceived.

[0032]

As described above, according to the present invention, even when there is almost no pressure loss, that is, when the gel-like substance does not change its shape and flows out, the gel can be effectively formed by the raised or cilia portion. Since the gel-like substance can be removed, the gel-like substance hardly flows into the subsequent pre-filter, so that the filtration life is greatly improved.

[Brief description of the drawings]

FIG. 1 is a partially cutaway perspective view showing an embodiment of the present invention.

FIG. 2 is a cross-sectional view of FIG.

FIG. 3 is an enlarged sectional view of a pleated portion of the outer layer pleated filter of the present invention.

FIG. 4 is a cross-sectional view of a state in which a pleat portion in FIG. 3 is expanded.

FIG. 5 is a cross-sectional view of another example of the pleated portion of the present invention in an expanded state.

FIG. 6 is a schematic sectional view showing a flow of a filtrate by a normal pre-filter.

FIG. 7 is an enlarged surface view showing a cross-linked state of surface fibers of a normal nonwoven fabric.

FIG. 8 is a cross-sectional view of another example of the pleated portion of the present invention in an expanded state.

[Explanation of symbols]

 2 Prefilter for inner layer 3 Prefilter for removing gel-like substance 7 Fine fiber 7 'Cilia 8 Flow hole

Claims (4)

[Claims]
1. An outer layer prefilter that mainly removes a gel-like substance is laminated on an inner layer prefilter that functions as an ordinary filter, and the outer layer prefilter has a pressure loss of 0%. 0.3 kg / cm 2
A laminated prefilter having a raised or cilia portion for removing a gel-like substance on a valley slope of a pleat.
2. The pressure loss is reduced to 0.3 by forming an opening at the tip of a valley of the outer layer of the pre-filter.
Pulley Tsu filter of claim 1 in which the kg / cm 2 or less.
3. The pre-filter according to claim 1, wherein the pre-filter of the outer layer is laminated on the pre-filter of the inner layer directly or via a filter medium.
4. The hair thickness of said raised or cilia portion is 5
The pleated filter according to any of claims 1 to 3, which has a size of from 50 to 50 microns.
JP13292798A 1998-05-15 1998-05-15 Laminated pleat filter Pending JPH11319427A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP13292798A JPH11319427A (en) 1998-05-15 1998-05-15 Laminated pleat filter

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP13292798A JPH11319427A (en) 1998-05-15 1998-05-15 Laminated pleat filter

Publications (1)

Publication Number Publication Date
JPH11319427A true JPH11319427A (en) 1999-11-24

Family

ID=15092763

Family Applications (1)

Application Number Title Priority Date Filing Date
JP13292798A Pending JPH11319427A (en) 1998-05-15 1998-05-15 Laminated pleat filter

Country Status (1)

Country Link
JP (1) JPH11319427A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2004508447A (en) 2000-09-05 2004-03-18 ドナルドソン カンパニー,インコーポレイティド Applications including polymers, polymer microfibers, polymer nanofibers, and filter structures
JP2011004663A (en) * 2009-06-25 2011-01-13 Central Res Inst Of Electric Power Ind Carbon dioxide decreasing system by recovery-isolation of sea plankton

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2004508447A (en) 2000-09-05 2004-03-18 ドナルドソン カンパニー,インコーポレイティド Applications including polymers, polymer microfibers, polymer nanofibers, and filter structures
JP2014073494A (en) * 2000-09-05 2014-04-24 Donaldson Co Inc Filtration method, filter medium and method of producing fine fiber layer
US9718012B2 (en) 2000-09-05 2017-08-01 Donaldson Company, Inc. Fine fiber media layer
US10272374B2 (en) 2000-09-05 2019-04-30 Donaldson Company, Inc. Fine fiber media layer
JP2011004663A (en) * 2009-06-25 2011-01-13 Central Res Inst Of Electric Power Ind Carbon dioxide decreasing system by recovery-isolation of sea plankton

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