JPS6393313A - Filter cartridge - Google Patents

Abstract

PURPOSE:To prepare a filter membrane easily and also manufacture a filter cartridge having a filter membrane of a long life at a low cost, by preparing a filter body consisting of a membrane partly bonded and combined with a synthetic resin reticulated material. CONSTITUTION:A filter membrane structure 1 is constituted with a plurality of piled-up planar plate type filter units of minimized numbers, for instance, consisting of two pieces, upper and lower, discoid filter membranes 2. The filter membrane 2, for instance, consists of a membrane 21 and a synthetic resin reticulated material 22 partly bonded with a bonding agent, for instance, at desired intervals in the forms of linear, link or dot-shape, and the membrane 21 forms the outside surface of the planer plate type filter unit, and the reticulated material 22 is adhered to the inner peripheral rim 3 and the outer peripheral rim 13.

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention relates to a filter cartridge for filtration incorporating a microporous filtration membrane, and is particularly used for drug filtration and drug production in the pharmaceutical industry. Purified water for the production of cleaning water, filtration of pure water, and filtration of purified water and pure water for the production of ultrapure water used in the electronics industry that performs fine processing, including the semiconductor manufacturing industry. It is used for filtration in the manufacturing process of alcoholic beverages in the food industry, purified water for ultrapure water production in laboratories, pure water filtration, and other precision filtration, and is used to filter fine particles and microorganisms of submicron order of 10 μm or less, especially 1 μm or less. The present invention relates to the structure of a filter cartridge for precision filtration.

(Prior art) A filter car incorporating a microporous filtration membrane) The IJ edge is made by processing a microporous filtration membrane into pleats, creating creases, and increasing the height in the direction parallel to the pleats. A cylindrical filtration membrane structure with a diameter is formed, a plastic member protects the inside and outside of the cylindrical filtration membrane structure, and another plastic member is attached to the cylindrical end. ! Conventionally, pleated type filter cartridges with a sealed structure have been widely used. This pleated type filter cart IJ Tsuji can increase the integrated area of the filtration membrane per volume (effective filtration area).
This filter, which has a large filtration flow rate per unit time and is heavily used as a large-volume filtration filter in the industrial fields and laboratories mentioned above, is used by being attached to a dedicated Hau or Kung, but in recent years it has been possible to eliminate the hassle of this attachment. For the purpose of
Alternatively, the effective filtration area is 0.05 to 0.4 as a filtration means for a filtration line where a variety of liquids are filtered in a short time and the filter is frequently replaced for the purpose of filtration of small amounts.
Disposable filter cartridges (also called capsule-type filter cartridges) in which a filtration membrane structure and a housing are integrated have come to be used. Additionally, a so-called mini-filter cartridge, which is attached to a metal housing and has a small effective filtration area for small-volume filtration, is also used. mini filter cartridge.

The filtration membrane structure and the filtration portion of the disposable filter cartridge described above are of the same or similar construction with the filtration membrane structure having a sealing portion for attachment to the housing. Disposable filter cartridges and mini filter cartridges are standard pleated type and JP-A-5
There is a flat plate laminated type filter cartridge in which flat plate type filtration units are laminated as disclosed in Japanese Patent No. 6-129016. The structure and manufacturing method of the pleated type disposable filter cartridge and mini filter cartridge are essentially the same as the pleated type filter cartridge used by being attached to the aforementioned housing, and in the case of the pleated type disposable filter cartridge, the filtration membrane structure After forming it, a step is added to insert it into a plastic housing. Structure of flat plate laminated filter cartridge of disposable filter cartridge and mini filter cartridge and F! The 0 method is basically as follows, as described in JP-A-56-129016.

2. The outer periphery and center are punched out in a circular or polygonal shape.
A sheet of filtration membrane is placed on a flat support (in some cases, two molded members are bonded together) and has parallel surfaces. It has a configuration in which it is attached to the peripheral edge, inner peripheral edge, or at a predetermined location as necessary. In particular, the outer peripheral edge and the inner peripheral edge must be sealed liquid-tightly by adhesive.

The flat support has an internal space formed by bonding two filtration membranes on the front and back sides, which is designed to form a flow path for the filtered liquid. That is, the flat support holds the two filtration membranes from the inside as described above, and the inner peripheral edge of the support is designed to allow the filtered liquid to flow as desired to the center of the flat filtration unit. It has a diaphragm structure with a central opening for filtrate outflow. Then, an adhesive means is applied to the central part of the flat plate type filtration unit, and a plurality of flat plate type filtration units are adhered to each other, thereby forming a filtration membrane structure in which the two knits are laminated in the thickness direction. An upper protection plate for protecting the filtration membrane is connected to the upper part of the laminate with a predetermined distance from the filtration membrane of the uppermost flat plate filtration unit. A lower protection plate is also provided at the bottom for the same purpose, in the case of a mini filter cartridge, to ensure that the housing is properly set.

The laminated filtration membrane structure formed in this way is adhered to a housing in the case of manufacturing a disposable filter cartridge, and in the case of manufacturing a mini filter cartridge, it is attached to a groove in which a sealing material such as Ceratos® is fitted into the housing. It was a structure in which a seal portion having a diameter was joined. What is desired for these disposable filter cartridges and minifilter cartridges is, for example, a large filtration area per given volume. In other words, it is necessary to provide a complete filtration module, to perform filtration with a small filtration pressure, to improve filtration accuracy, to make it easy to attach and detach the cartridge filter to the filtration line, and to prevent scratches and shocks during handling. It is possible to prevent damage to the microporous membrane caused by oxidation, reduce filtration costs, and reduce residual liquid 9.

(Problems to be solved by the present invention) However, in the conventional flat plate type filtration unit,
For example, in the structure disclosed in JP-A No. 56-129016, the flat support is provided with a large number of concentric lips and channels, and this lip Vc filtration membrane is attached. The portion where the membrane and ribs are bonded cannot function as a filter membrane. In other words, the area of the portion that does not function as a filtration membrane is large, and there is a problem in that the effective filtration area becomes small compared to the area of the entire filtration membrane. In addition, if the filtration membrane is attached at multiple locations on the front and back sides of the flat support, the filtration membrane is likely to become distorted, and distortion may occur at the outer and inner peripheral edges between each filtration membrane and the flat support. Furthermore, in the case of an extremely compact structure such as the object of the present invention, it is difficult to process it and requires a lot of man-hours, which not only causes cost problems but also makes it difficult to ensure tightness, etc. There was also a problem with the individuality of Furthermore, if the structure of the flat support, especially the structure of the liquid flow path, is complicated as disclosed in the above publication, which consists of many channels, channels, etc., the filtration resistance becomes large and the liquid flow becomes worse. Also, there were problems with air bleeding, residual liquid bleeding, etc. Furthermore, the manufacturing cost of the plate-shaped support was high, and the assembly cost was also high. .

(Object of the invention) The present invention has been made to solve the above problems,
The purpose of the present invention is to provide an inexpensive filter cartridge having a large effective area of the filtration membrane, excellent reliability in liquid-tightness of the filtration membrane, simple structure, and a filtration membrane structure with excellent workability. That is.

(Structure of the Invention) The above object of the present invention is to provide a flat laminated type filter cartridge equipped with a filtration membrane structure formed by laminating one or more flat plate type filtration units having filtration membranes above and below a support. This is achieved by a filter cartridge characterized in that the filtration membrane is composed of an assembly in which a membrane membrane and a net-like body made of synthetic resin are partially adhered.

Embodiments of the present invention illustrated in the drawings will be described below.

FIG. 1 is a sectional view of a main part explaining an embodiment of the present invention, and is a partial sectional view of a filtration membrane structure 1 in a flat plate laminated type filter cartridge. , FIG. 2 is a partially enlarged sectional view of a flat plate type filtration unit according to the present invention.

As shown in FIG. 1, the filtration membrane structure 1 has a structure in which a plurality of flat plate filtration units, each of which is the minimum unit, each consisting of two upper and lower filtration membranes 2, for example, in the form of a disc, are stacked. That is, a core 4 having a communication hole 5 is provided in the center, and a plurality of supports (inner circumferential rim 3, outer circumferential rim 6) having two filters 11ii2 adhered to the outer periphery of the core 4 are fitted. An upper protection plate 7 and a lower protection plate 8 for protecting the filtration membrane 2 are provided above and below the laminated supports.

Further, as shown in FIG. 2, the filtration membrane 2 has an outer peripheral edge 12.
The entire area is attached to a ring-shaped outer circumferential protrusion to maintain liquid tightness.For example, this outer circumferential rib G is provided with an outer circumferential protrusion that protrudes in the thickness direction of the filtration unit, and the flat plate type filtration unit When a plurality of protective plates 7 and 8 are stacked, for example, by gluing the outer parts together, a reinforcing structure can be created in which the frame passes between the upper and lower protective plates 7 and 8 at appropriate intervals in the circumferential direction of the rim. .

The filtration membrane 2 has its inner peripheral edge 11 fixed to the upper and lower sides of the inner rim 3, respectively, and its outer peripheral edge 12 is stuck and sealed to the outer circumference over its entire circumference.

The width of the adhesion at the inner peripheral edge 11 and outer peripheral edge 12 (
Although the width (in the radial direction) is not particularly limited, it is preferable to have a certain width in consideration of liquid tightness and reduction of the effective area due to adhesion. Specifically, the width is preferably 0. 1 to 5- is appropriate.

FIG. 3 is a partial cross-sectional view of the filtration membrane 2 according to the present invention, showing the structure of the filtration M2. It is partially attached with adhesive in a straight line, link shape, or dot shape at intervals, and the membrane membrane 21 is the outer surface of the flat plate type filtration unit, and the mesh body 22 is attached to the inner peripheral rim 3.
And it will be pasted on the outer rim 13. Therefore, the filtration membrane 2 is made stronger by the net-like body 22, and handling properties are greatly improved.Also, since the net-like body 22 has mechanical strength, the membrane membrane 21 can sufficiently withstand relatively high filtration pressure. Therefore, the filtration membrane 2 can also perform filtration while keeping parallel to the top and bottom of the flat plate filtration unit.

The above-mentioned inner and outer peripheral rims 3, 13 and upper and lower protection plates 7 in the present invention
. nate, polyvinylidene fluoride, polysulfo/, polyoxy7 methylene m
For filtration, fluororesins such as fat, t-lyamide, phenylformaldehyne P resin, polytetra, fluoroethylene, or tetrafluoroethylene perfluoroalkyl vinyl ether copolymer, polychlorotrifluoroethylene, etc. can be appropriately selected and used. Membrane 2 is membrane membrane 2
1 and a net-like body 22 made of synthetic resin are bonded together with an adhesive 23 in the form of dots or linear rings. The membrane membrane 21 is made of, for example, triacetyl cellulose polyacide,
It is a porous filter generally called a membrane filter made of polyvinylidene fluoride, polysulfone, or polytetrafluoroethylene.

The material of the mesh body 22 made of synthetic resin that constitutes the filtration membrane 2 and supports the membrane film 21 is preferably polyester or polypropylene, and the mesh structure may be, for example, any one of a square mesh, a hexagonal mesh, and an octagonal mesh. It's okay.

The membrane membrane 21 and the net-like body n made of synthetic resin are partially adhered with an adhesive 23 in order to increase the mechanical strength and stiffness of the filtration membrane and to secure the filtration area. An example of a method for manufacturing this filtration membrane is shown in FIG. Membrane film 2
1, the adhesive 24 is transferred to the application roller 26 by the applicator roller 25. The applicator roller partially has a roller surface for transferring the adhesive 24 onto the membrane/membrane 21 and transfers the adhesive 24 as a line or dot to the membrane/membrane 21 while being supported by the non-tuck-up roller 27. The image is transferred and sent to the press roll 28.

On the other hand, the linear body 22 is combined with the membrane film 21 by a press roll 29, and the adhesive portion is stuck by the press rolls 28 and 29, thereby forming the filtration membrane 2.

The filtration membrane 2 and the filtration membrane 2 and the inner and outer peripheral rims 3 in the present invention,
13 can be easily bonded using a method using a solvent type adhesive, a method using a thermal crosslinking type adhesive, a heat sealing method, or the like. Therefore, the sealing of the two upper and lower filtration membranes 2 is extremely simple and does not involve any complicated steps, so that reliable liquid tightness can be guaranteed.

It goes without saying that the lower side of the core 4 has a structure that is connected to a nozzle (not shown) in a liquid-tight manner as in the conventional case.

The path of the filtrate in the filter cartridge equipped with the filtration membrane structure 1 constructed as described above is shown by the arrows in FIG. That is, the filtrate flowing into the housing (not shown) K flows outside the sealed upper and lower filtration membranes 2 (
- Next side), it permeates into the filtration membrane 2 by appropriate liquid pressure, and the inner peripheral edge 11, the outer peripheral edge 12, and the membrane membrane 21.
Impurities such as fine particles and microorganisms are filtered in the entire area other than the adhesive part of the mesh body 22 and enter the inside (secondary side) of the filtration membrane 2, causing convulsions! It passes through a plurality of central openings 10 formed in the inner circumferential rim 3, passes through the communication hole 5 connected to the central opening 10, passes through the hollow part of the core 4, and is discharged from the filter cartridge to undergo the desired filtration process. .

In this way, the portion of the filtration membrane 2 used for the filtration action excludes the inner circumferential edge 11 and the outer circumferential edge 12 fixed to the inner circumferential rim 3 and the outer circumferential rim 13, and the bonded portion between the membrane membrane 21 and the net-like body 22. Since it covers the entire area, like the conventional flat-plate filtration two-knit type, the filtration membrane is finely arranged with ribs or channels over almost the entire area from the inner circumference side to the outer circumference side, and the filtration membrane is attached and supported by these supports. Compared to the structure of the present invention, there are fewer places to attach and support, and the filtration area can be increased, and the filtration pressure can also be kept low.

Furthermore, unlike conventional supports that hold the filtration membrane 2 from the inside and complicate the passage of the filtrate, the filtrate flows well and the amount of filtrate remaining at the final stage of the filtration process is reduced. For example, it is possible to easily bleed air or remove residual liquid.

In the above embodiment, the support for the filtration membrane 2 is
Although the membrane 2 has a structure in which there is no support means in the filtration area (a structure consisting only of the inner rim 3 and the outer rim 13), it has a structure that has a portion that connects the inner rim 3 and the outer rim 13 as appropriate. Needless to say, it's a good thing.

(Effects of the Invention) The present invention provides a flat plate type filter cartridge in which one or more flat plate type filtration units are laminated. ! When manufactured by arranging them in parallel, the upper and lower two filtration membranes are used as an assembly in which the membrane membrane and the net-like body made of synthetic resin are bonded in advance, making the filtration membranes strong and easy to handle. Therefore, it can be manufactured much more easily than the conventional method of directly attaching a membrane membrane to a support. In addition, since the membrane does not need to be finely attached to a support as in the conventional structure, the effective area of the filtration membrane can be increased, extending the filtration life, and the filtration pressure can be lowered, reducing filtration costs. was able to reduce.

Further, the filtration unit according to the present invention has a simple structure, has good workability, is excellent in liquid tightness, and can provide an inexpensive flat-plate laminated filter cartridge that is small and lightweight.

[Brief explanation of the drawing]

FIG. 1 is a fragmented sectional view of a filter cartridge illustrating an embodiment of the present invention, FIG. 2 is a partially enlarged sectional view of a filtration unit according to the present invention, and FIG. 3 is a partially enlarged sectional view of a filtration membrane according to the present invention. , FIG. 4 is a process diagram of one method for manufacturing a filtration membrane according to the present invention. DESCRIPTION OF SYMBOLS 1... Filtration membrane structure, 2... Filtration membrane, 3... Inner circumference rim, 4... Core, 5... Communication hole, 6... Outer circumference rib, 7... Upper protection Plate, 8... Lower protection plate, 10.
... Central opening, 11... Inner peripheral edge, 12... Outer peripheral edge, 13... Outer rim, 21... Membrane membrane,
22... Network body, 23... Adhesive part, 24... Adhesive, 25... Applicator roll, 26... Application roll, 27... Smooth pick-up roll, 28, 29...
...Press roll. , 2゛-1 (-', 1, +, J, -ㅅ (and 3 others) @ 1 Figure 2 Figure 13; RiV practice 3F!!J

Claims (1)

[Claims] 1 flat plate filtration unit with filtration membranes on the top and bottom of the support
A flat laminated type filter cartridge equipped with a filtration membrane structure formed by laminating one or more filtration membranes, characterized in that the filtration membrane is composed of an assembly in which a membrane membrane and a net-like body made of a synthetic resin are partially adhered. filter cartridge.