JPH08168656A - Member for assembling filter element - Google Patents

Abstract

PURPOSE: To surely eliminate the contamination of liquid to be filtered due to powders produced by sliding friction between each membrane and a filter fluid passage holding supporter body in a filter element assembling member which has the supporter body between two membranes. CONSTITUTION: A filter fluid passage holding supporter body 2 is provided between two membranes 1, 1, and the body 2 and each of the membranes 1 are, connected together partially or over entire surfaces thereof so that a gap therebetween has a fluid permeating function and a filter fluid passage. As the body 2, a net made of synthetic resin of 10-100 meshes and having a thickness of 0.2-2.0mm or a porous body of synthetic resin or non-woven fabric having void content of 20% or more and a thickness of 0.2-2.0mm can be used, and a synthetic resin net or a synthetic resin porous body or a non-woven fabric 5 also may be bonded to the outer surface of each of the membranes 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a filter-element assembly member for use in filtering liquids or gases, and in particular, an ultra-high precision filter used in the production of electronic industrial water or pharmaceutical water-
The present invention relates to a member for assembling an element.

[0002]

2. Description of the Related Art A filter element using a flat membrane, a hollow fiber membrane, a tubular membrane or the like is known as a filter element used for filtering a liquid or a gas. Generally, a structure in which a support for holding a filtered fluid channel, for example, a synthetic resin net is arranged between two flat membranes is widely used.

FIG. 5 shows a cartridge filter which is often used for high precision microfiltration in the electronic industry field and the chemical field.
Of the element, a support 2'for holding a filtered fluid channel, for example, a synthetic resin net is arranged between two membranes 1'and 1 ', and a hole 3'is provided in the center of the stack, and The outer periphery of the stack is fused or sealed with an adhesive, and the holes 3 '
In each of the membrane surfaces, a water collecting ring 4'is fixed by fusion bonding or an adhesive, the element members A'constructed in this way are laminated, and the element members are connected to each other by the water collecting ring 4 ',
They are connected by fusion or adhesive between the 4 '.

In the support 2'for holding the filtered fluid flow path of the filter element, the filtered liquid flow path is held between the membranes by preventing the membranes from adhering to each other due to the pressure of the stock solution in contact with the outer surface of the membrane. The filtrate that has passed through the membrane is put into a port in the water collection ring.
Element member A'supporting the membrane 1 ',
A'prevents close contact with each other. Therefore, even if the support for holding the filtered fluid flow path in the filter element is a support for a membrane, it may be a composite membrane or laminer.
Unlike the porous support in the membrane, it does not provide mechanical reinforcement to the membrane (since the membrane of the filter-element itself has sufficient mechanical strength), each membrane and the support for retaining the filtered fluid flow channel There is no binding between and and it is free to slide.

[0005]

As is well known, in the electronic industrial water used for washing in the LSI manufacturing process, L
With the increase in the degree of integration of SI, there is an increasing demand for ultra-high purity. In addition, pharmaceutical water is required to be as highly purified as possible to ensure safety.

However, in the above-mentioned conventional filter element, since each membrane and the support for holding the filtered fluid flow channel are in a freely slidable state, when the filter element is bent, the membrane and the filtered fluid are filtered. Sliding friction with the flow path holding support is unavoidable, contact external force during filter assembly and pulsation of the stock solution pressure during filtration (especially when using a bellows pump as the pump), transients at pump startup Due to bending of the filter element due to dynamic pressure fluctuation, abrasion powder and static electricity are inevitably generated due to sliding friction even if the amount is slight, and the above-mentioned electronic industrial water and pharmaceutical water are required to be purified with high precision. Is a problem.

That is, under the simultaneous generation of wear particles and static electricity during filter assembly, the generated wear particles are adsorbed on the inner surface of the membrane on the filtrate side due to static electricity, and cleaning after filter assembly is completed. Cannot be completely removed by the above method and is mixed into the filtrate while separating from the membrane surface during filtration. Also, the abrasion powder generated on the filtrate side of the membrane during filtration is immediately mixed into the filtrate. However, it is not possible to satisfactorily achieve the ultra-high precision purification required for the electronic industrial water.

In view of these points, an object of the present invention is to provide a filter having a support for holding a filtered fluid channel between two membranes.
In the element assembling member, it is necessary to surely eliminate the contamination of the filtered liquid caused by the abrasion powder due to the sliding friction between each membrane and the filtered fluid flow path holding support.

[0009]

A filter according to the present invention
The element assembly member has a support for holding a filtered fluid flow path between two membranes, and a fluid permeation function and a filtered fluid flow path are held between the support for holding a filtered fluid flow path and each membrane. It is characterized in that it is bound to the entire surface or a part thereof so that the filtered fluid channel holding support has 10 to 10 parts.
0 mesh and synthetic resin net with a thickness of 0.2 to 2.0 mm or a porosity of 20% or more and a thickness of 0.2 to
Either a 2.0 mm synthetic resin porous body or a non-woven fabric can be used, and a synthetic resin net or a synthetic resin porous body or a non-woven fabric can be attached to the outer surface of each membrane. As the above-mentioned binding means, there is a binding point between the membrane support and each membrane by applying or fusing an adhesive in a dot shape, a stripe shape, a grid shape, a net shape, or the like. It is possible to use a material that is bound in such a manner that the fluid permeation function and the filtered fluid channel can be retained. Further, the attachment means can be performed in the same manner as the binding means, and a synthetic resin net or the like can be attached to the outer surface of each membrane so that the fluid permeation function can be maintained by applying an adhesive or fusing.

[0010]

In the member for assembling the filter-element according to the present invention, since each membrane and the support for holding the filtered fluid flow channel are bonded, even if the membrane is bent, the flow of each membrane and the filtered fluid flow is prevented. There is no sliding friction between the road support. Therefore, even if the filter element is bent during the assembly of the filter, or if the filter element swings due to the pulsation of the stock solution pressure during use of the filter, each membrane and the filtration fluid flow path holding portion can be maintained. It is possible to avoid the generation of static electricity and abrasion powder with the support, and it is possible to eliminate the contamination of the filtrate caused by the abrasion powder. Therefore, ultra-high precision filtration required for electronic industrial water, pharmaceutical water, etc. becomes possible.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a filter-element assembly member according to the present invention will be described below with reference to the drawings. FIG. 1 shows an embodiment of a filter element assembled by using the filter-element assembling member according to the present invention, which is a laminated type. In FIG. 1, reference numerals 1 and 1 denote two membranes, usually a microfiltration membrane is used, and a chemically resistant porous synthetic resin membrane, for example, a pore diameter of 0.01 to 1.0 μm,
A porous fluororesin film, a porous polyolefin film, a porous polysulfone film or the like having a porosity of 60 to 95% and a thickness of 30 to 100 μm can be used. Reference numeral 2 is a support for holding a filtered fluid channel, which has a mesh size of 10 to 100 and a thickness of 0.2 to
A 2.0 mm synthetic resin net or a synthetic resin porous body or non-woven fabric having a porosity of 20% or more and a thickness of 0.2 to 2.0 mm is used. Reference numeral 3 denotes a hole formed in the center of the support 2 for holding the filtered fluid channel and the membranes 1 and 1.

Between the respective membranes 1 and the support 2 for holding the filtered fluid flow path, the entire surface or the surface of the support 2 for holding the filtered fluid flow path does not slip even if bent and can hold the filtered fluid flow path. It is partially bonded by heat fusion or an adhesive.
The outer periphery between the films 1 and 1 is sealed by heat fusion or an adhesive.

Reference numeral 4 denotes a water collecting ring (made of chemical resistant synthetic resin, such as fluororesin or polysulfone, which is fixed to the outer surface of each film 1 at the central hole 3 by heat fusion or an adhesive. The water collecting rings 4 and 4 are engaged with each other by the fitting of the pin portion 41 and the uneven portion such as the pin hole 42.

A is a filter constructed in this way
Fig. 2 shows an element assembling member, in which the filter-element assembling member A is laminated, and the members are connected to each other by heat fusion between water collecting rings or an adhesive to form a filter-element.

FIG. 2 shows another embodiment of the filter-element assembled by using the laminated type filter-element assembly member according to the present invention. In contrast to the above-mentioned embodiment, the outer surface of each membrane 1 is A synthetic resin net, a synthetic resin porous body, or a non-woven fabric 5 is wholly or partially attached by heat fusion or an adhesive, and the inner circumference of the synthetic resin net 5 or the like is on the outer peripheral surface of each water collecting ring 4. The other structure is almost the same as that of the embodiment shown in FIG. Thus, in FIG. 2, the support 2 for holding the filtered fluid channel and each membrane 1 are wholly or partially bound to each other,
The membranes 1 and the water collecting ring 4 are watertightly fused or bonded, and the filter-assembling members A and A are watertightly connected to each other between the water collecting rings 4 and 4.

In the embodiment shown in FIG. 2, a filter
Even if the element assembling members A and A are brought into contact with each other, there is an advantage that the stock solution flow path can be reliably held by the attached synthetic resin net 5 or the like on the outer surface of the membrane.

FIG. 3 shows an embodiment of a filter element assembled by using the pleated type filter-element assembling member according to the present invention. The filter fluid channel holding support 2 and each membrane 1 are shown in FIG. The laminate film having the entire space or a part thereof bonded is folded into a pleat shape, and both ends are joined with resin to form a tubular shape, and the annular end caps 6, 6 are provided at both ends of the tubular body. Are watertightly attached by an adhesive resin.

In the embodiment shown in FIG. 3, the outer side of the tube is used as the stock solution side, and the inner side of the tube is used as the filtered solution side. Even if slippage occurs at the contact points between the inner films, the film and the synthetic resin are used. Since it is bound to the net etc., it does not cause sliding friction, and it is possible to sufficiently prevent the generation of wear debris, and it is possible to prevent contamination of the filtrate by the wear debris well. In the pleated type embodiment, it is also possible to insert a synthetic resin net or the like for holding the undiluted solution flow passage at the contact position between the outer membranes.

FIG. 4 shows an embodiment of a filter element assembled by using the spiral type filter-element assembling member according to the present invention. The filter fluid channel holding support 2 and each membrane 1 are shown in FIG. Laminates in which the spaces are completely or partially bonded, and a synthetic resin net or a synthetic resin porous body or a non-woven fabric 5 is wholly or partially adhered to the outer surface of each film 1 by heat fusion or an adhesive. The three-sided edge of the membrane is sealed by heat fusion or an adhesive, and at the remaining one edge, the filtrate flow path between the membranes 1 and 1 is water-tightly connected to the porous water collection pipe 7, and the laminate membrane is further provided. Is wound around the water collecting pipe 7.

In the filter-element assembly member according to the present invention, the above-mentioned filtered fluid channel holding support is sandwiched between the membranes, and the entire surface or the space between each membrane and the filtered fluid channel holding support is sandwiched. Partially bonded by heat fusion or an adhesive, and if necessary, a synthetic resin net, a synthetic resin porous body or a non-woven fabric is attached to the outer surface of each film, and the laminate thus produced It can be manufactured by cutting the membrane to a specified size, pleating in the case of a pleat type, and further sealing the edge and attaching a water collecting ring, an end cap or a water collecting pipe. it can. Therefore, even if the laminate membrane is bent during the manufacture of the filter element, the membrane and the support for retaining the filtered fluid flow channel are already bound to each other, so that the membrane and the support for retaining the filtered fluid flow channel are supported. The sliding friction with the body can be eliminated and the filter-
It is possible to eliminate the generation of abrasion powder on the filtrate side of the element.

It is also possible to cut the membrane and the support for holding the filtered fluid flow path into predetermined dimensions, respectively, and then stack these to bond the membrane and the support for holding the filtered fluid flow path. However, in this case, it is difficult to align the edge of the support for retaining the filtered fluid channel and the edge of the membrane, and there is a case where the membrane edge is not properly sealed due to misalignment. It is preferable to cut the sheet after stacking the support and the membrane, and further after binding between them.

[0022]

In the filter element according to the present invention, in the filter element of the type in which the support for holding the filtered fluid flow path is arranged between the membranes, the space between the membrane and the support for holding the filtered fluid flow path is provided. Since it is attached in advance, the filter-
During assembly of the filter or during use of filtration of the filter, it is possible to prevent generation of abrasion powder due to sliding friction between the support for retaining the filtered fluid channel and the membrane, and the contamination of the filter element on the filtrate channel side due to the abrasion powder. Since it can eliminate the wastewater, it greatly contributes to the ultra-high-precision purification of raw water required for electronic industrial water and pharmaceutical water.

[Brief description of drawings]

FIG. 1 is an explanatory diagram showing an embodiment of the present invention.

FIG. 2 is an explanatory diagram showing another embodiment of the present invention different from the above.

FIG. 3 is an explanatory diagram showing another embodiment of the present invention different from the above.

FIG. 4 is an explanatory diagram showing another embodiment of the present invention different from the above.

FIG. 5 is an explanatory diagram showing a conventional example.

[Explanation of symbols]

1 Membrane 2 Support for Holding Filtered Fluid Channel 5 Synthetic Resin Net or Synthetic Resin Porous Body or Nonwoven Fabric

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Tomio Shimohozumi 1-2-2 Shibahozumi, Ibaraki City, Osaka Prefecture (72) Inventor Takashi Yamagishi 3-11-2 Midori, Minamikawachi-cho, Kawachi-gun, Tochigi Prefecture issue

Claims (3)

[Claims] 1. A support for retaining a filtered fluid channel is provided between two membranes, and a fluid permeation function and a filtered fluid channel can be retained between the support for retaining a filtered fluid channel and each membrane. A filter-element assembling member, characterized in that it is entirely or partially bonded. 2. The filter-element assembling member according to claim 1, wherein the support for holding the filtered fluid channel is any one of a synthetic resin net, a synthetic resin porous body and a non-woven fabric. 3. The filter-element assembly member according to claim 1, wherein a synthetic resin net, a synthetic resin porous body or a non-woven fabric is attached to the outer surface of each membrane.