JPH0641809U - Cartridge filter - Google Patents

Abstract

(57) [Abstract] [Object] An object of the invention of the present application is to provide a cartridge filter which does not leak and does not cause cracks due to external pressure. [Structure] The invention of this application is a cartridge filter in which a film is fused to both ends of a cartridge filter in which a plurality of layers of fiber filter material are wound.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a cartridge cartridge for filtration used for removing solid matter in a liquid, and more particularly, to a non-woven fabric wound laminated cartridge filter.

[0002]

[Prior art and its problems]

 As a cartridge filter for filtering fine particles in a liquid, it is known that a thread, a string, a paper, a non-woven cloth or the like is molded into a perforated cylindrical shape. However, the cartridge filter in which the filter material is wrapped around the porous core and the end caps such as gaskets are attached to both end faces has a problem that the end caps are difficult to make and attach and the cost is high. A cartridge filter (with no end cap) is processed into a film by wrapping a filter material made of thermoplastic fiber around it and heat-pressurizing both end surfaces. The formed film becomes a hard film. There is a problem that cracks are likely to occur due to external pressure, holes are likely to be formed, and leakage is likely to occur, and furthermore, since there is no elasticity, deformation due to external pressure does not return to the original and causes leakage. Although some of these can be dealt with by increasing the density of the filter medium to reduce the pore size, increasing the density of the filter medium increases the liquid passage resistance and significantly shortens the service life. There was a problem. In addition, there has been no remedy for leaks.

[0003]

[Means for Solving the Problems]

 The inventors of the present application have been able to solve these problems by fusing the film to both ends of the cartridge as a result of various studies in order to eliminate these drawbacks. That is, the invention of the present application relates to a cartridge filter in which a film is fused to both ends of a cartridge filter in which a plurality of layers of fiber filter material are wound, and the film of both ends of the cartridge filter obtained by the invention of this application is disclosed. With this, elasticity can be obtained and leakage can be prevented.

[0004]

【Constitution】

 That is, in the cartridge filter of the present invention, which has a structure in which a filter material is wound around a porous core, a film is fused on the end face, and the film fused on both ends of the cartridge filter is Single-layer or multi-layer is used. The film to be attached is preferably an unstretched film, and the film is preferably a composite film composed of two layers of resins having different melting points.

As the monolayer film, for example, a film of polypropylene, polyethylene, polyamide, polyester or the like is suitable, and a mixed resin film is also used. The fusion is performed by heating and press-bonding the filter medium and the film. For fusion bonding, it is important to process the film while maintaining the film shape and at a temperature at which the film exhibits adhesiveness. An unstretched film is preferable because an unstretched film has a higher dimensional stability during heat fusion than a stretched film. Further, the stretched film contains many crystal parts, and it is necessary to heat it to a high temperature in order to remove the crystal parts so that the film can be fused. Therefore, deformation is likely to occur, and the temperature setting is difficult.

Suitable multilayer films include polyethylene / polypropylene, polypropylene / modified polypropylene, polyethylene terephthalate / copolyester, nylon 6,6 / nylon 6, nylon 6 / copolyamide film, and the like. Mixed resin films are also used. The fusion is performed by heating and pressing the low melting point component side and the filter medium. For example, in the case of polyethylene / polypropylene film, even if the polyethylene component is substantially melted, the polypropylene component retains the film shape, so that the processing temperature can be varied.

As the fibrous filter medium of the present invention, thread, string, paper, non-woven fabric and the like can be used, and non-woven fabric is particularly suitable. As the non-woven fabric, a non-woven fabric composed of thermoplastic fibers is preferable because high bonding strength can be obtained when it is fused with the film. For example, as the non-woven fabric, a fiber-bonded non-woven fabric, a melt blown non-woven fabric, or the like is preferably used. In particular, the meltblown nonwoven fabric is suitable for collecting fine particles.

The nonwoven fabric produced by the melt blow method or the jet spinning method is formed by spraying the fiber stream between a pair of driven rolls or by accumulating it on a conveyor. When the melt-blown non-woven fabric accumulated on the conveyor and the melt-blown non-woven fabric accumulated between the rolls are laminated, the latter has a function of a spacer as well as a filter action, so that it has a high collection ability and a long service life. It is suitable as a filter medium because it has both length.

As a raw material for the non-woven fabric, it is preferable to use a thermoplastic resin such as polyolefin, polyamide or polyester in order to enhance the adhesiveness to the film. When polypropylene resin is used together with the porous core, it is characterized by constituting a cartridge filter made of all polypropylene resin, and since no binder or adhesive is used, there are problems such as chemical resistance and elution. Not only that, it can be autoclaved, and it can withstand a normal temperature of 90 ° C and is excellent in food hygiene.

The structure of the cartridge filter of the present invention is shown in FIGS. In the figure, 1 is a porous core, 2 is a nonwoven fabric (filter material), 3 is a film, and 4 is a porous mesh cylinder. Therefore, FIGS. 2 and 3 show a filter body in which the nonwoven fabric 2 is wound around the porous core 1. FIG. 1 is a partially cutaway perspective view of the cartridge filter. The nonwoven fabric 2 is wound around the porous core 1, and the polypropylene resin porous mesh cylinder 4 is arranged outside to protect the filter medium. 3 was completely welded to both ends of the cartridge filter by the heating and melting method.

The cartridge filter of the present invention is installed in a filter housing, and the medium to be filtered is passed from the outer perforated mesh cylinder 4 through the filter material to the inner porous core 1 to thereby remove the medium in the liquid. Since it can remove fine particles efficiently, it is suitable for use in filtration of pure water, solvents and chemicals in the field of electronics and filtration of process water, solvents and intermediate products in the fields of pharmaceuticals and cosmetics. Hereinafter, specific examples of the invention of this application will be shown by examples.

[0012]

【Example】

Example 1 A melt blown non-woven fabric having a fiber diameter of 2μ and a basis weight of 80 g / m ² was wound together on the surface of a porous core to produce a cylindrical structure having an outer diameter of 64 mm and a winding density of 0.085 g / cm ³ . Both ends of the core are cut in parallel with the cross section of the core so as to protrude from the tip of the core by 4 mm, and an unstretched polypropylene film having a thickness of 0.3 mm is applied to both end faces. Next, the bowl-shaped mold is heat-pressed from both sides at 200 ° C. and 4 kg / cm ² for 6 minutes, then cooled and taken out from the mold.

Example 2 A carrier material was obtained by fiber-bonding polypropylene / polyethylene composite fibers having a fiber diameter of 3 mm and a fiber length of 51 mm on the surface of a porous core as a carrier material, and a fiber diameter of 2 μm and a basis weight of 80 g / m 2. ² Melt blown non-woven fabric is wound together to produce a cylindrical structure with an outer diameter of 64 mm and a winding density of 0.09 g / cm ³ , and cut both ends parallel to the core cross section by protruding 4 mm from the core tip. Then, a two-layer film made of polypropylene / low-density polyethylene is applied to both end surfaces. Then, after heat-pressing with a bowl-shaped mold at 160 ° C. and 4 kg / cm ² for 6 minutes, it is cooled and taken out from the mold.

Comparative Example 1 In Example 1, after the cylindrical body was manufactured, the film was not pressed and then heat-pressed in the mold as it was, followed by cooling and taking out from the mold.

Comparative Example 2 In Example 2, after the cylindrical body was manufactured, it was heated and pressed in the mold as it was without applying a film, then cooled and taken out from the mold.

Comparative Example 3 A commercially available cartridge filter in which both end faces of a cartridge wound with a non-woven fabric are heat-sealed.

Leaks were confirmed by mounting the examples and comparative examples on a housing. A leak was judged to have occurred when the collection efficiency dropped sharply and at the same time the rise in differential pressure stopped. The results of Examples and Comparative Examples are as shown in Table 1.

[0018]

[Table 1]

[0019]

[Effect of device]

According to the invention of this application, it is possible to reliably seal the end faces without causing a leak while maintaining the proper density of 0.07 to 0.10 g / cm ^{3 so} that the filter medium can have a long life, and the film has elasticity. Therefore, it is possible to obtain an excellent effect that cracks due to external pressure are unlikely to occur and that the housing can be reliably sealed.

[Submission date] July 21, 1993

[Procedure Amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0019

[Correction method] Change

[Correction content]

[0019]

[Effect of device]

According to the invention of this application, it is possible to securely seal the end face without causing a leak while maintaining the proper density of 0.07 to 0.10 g / cm ³ for obtaining a long service life of the filter medium, and to make the film elastic. Therefore, it is possible to obtain an excellent effect that cracks due to external pressure are unlikely to occur and that sealing with the housing can be reliably performed.

[Brief description of drawings]

FIG. 1 is a partially cutaway perspective view of a cartridge filter of the present invention.

FIG. 2 is an explanatory view of a cartridge filter in the process of manufacturing according to the invention of this application.

FIG. 3 is an explanatory view of a cartridge filter in the process of manufacturing of the present invention,

[Explanation of symbols]

 1 Porous Core 2 Nonwoven Filter Material 3 Film 4 Perforated Net 5 Outer Layer 6 Inner Layer

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[Procedure amendment]

[Submission date] July 21, 1993

[Procedure Amendment 2]

[Document name to be amended] Statement

[Name of item to be corrected] Brief description of the drawing

[Correction method] Change

[Correction content]

[Brief description of drawings]

FIG. 1 is a partially cutaway perspective view of a cartridge filter of the present invention.

FIG. 2 is an explanatory view of a cartridge filter in the process of manufacture according to the invention of this application.

FIG. 3 is an explanatory view of a cartridge filter in the process of manufacturing according to the invention of this application.

[Explanation of reference numerals] 1 porous core 2 nonwoven fabric filter material 3 film 4 porous net cylinder 5 outer layer 6 inner layer

Claims (1)

[Scope of utility model registration request] 1. A cartridge filter, wherein films are fused on both ends of a cartridge filter made of a fibrous filter material.