JPS61278319A - Thick filter cartridge - Google Patents

Abstract

PURPOSE:To obtain a web winding type thick filter cartridge high in the filter precision by providing a filter medium layer wherein at least a couple of a web layer and the cloth are laminated. CONSTITUTION:The cloth 2 having 100-650g/m<2> weight and about 0.1-1mm thickness is laminated with yarn having 100-1,000 denier on a web layer 1 wherein the fiber having 5-100mum fiber diameter is needle-punched into the nonwoven cloth having 250-2,500g/m<2> weight and 0.5-5mm thickness. This is wound into a cylindrical core 3 of a structure having 35-36mm outside diameter, 5-10 inch length, 2-8mm thickness of the cylinder, 3-8mm hole diameter and 80-230 piece/5 inch hole number with >=0.5kg/cm<2> tension. The filter medium is preferably wound in 2-30 plies. The end of the wound filter medium is sewed with a suitable filament 4 or melt-stuck.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a thickness filtration cartridge having a novel configuration.

Prior Art Various types of thickness filtration cartridges have been developed in the past. One of them is one in which yarn is wound multiple times around the core surface for the I-liquid passage, and the other is a web (without a base fabric) in which fibers are entangled with each other by needle punching, and is wound around the core. This is what I put on it.

In the former case, the r-overaccuracy is relatively high, but the amount of particles retained in the processing liquid is small. It's also expensive. The latter is relatively inexpensive, but the filtering accuracy is not necessarily sufficient.

OBJECTS OF THE INVENTION An object of the present invention is to provide a web-wound type thick filtration cartridge with high filtration accuracy.

Structure of the Invention The present invention provides a web layer (1) as shown in FIGS.
) and cloth (2) are laminated in at least one set.

The present invention will be explained based on FIGS. 1 to 3.

FIG. 1 is a partial longitudinal cross-sectional view of the cartridge of the present invention, and FIG.
The figure shows a cross-sectional view.

The cylindrical core (3) of the present invention normally allows >PeL to pass through, and its dimensions may be set based on desired standards. Usually, the standard values are set to have an outer diameter of 35 to 36 mm and a length of 5 inches and 10 inches. The thickness of the cylinder is usually 2 to 8 mm, which is suitable for strength. The shape of the hole is suitably circular or rectangular, but is not limited thereto. The hole size is preferably 3 to 8 mm, and the number of holes is preferably 80 to 230 in a 5 inch cartridge.

The filtration layer of the present invention includes not only a web layer but also a cloth layer, and has a loose and dense structure. This results in good results for I overaccuracy, y overaccuracy and life.

When using a felt without a base fabric in which fibers are needle-punched as the web layer, the fabric may be superimposed on the felt and wrapped around the core.

Felt in which webs are needle-punched on the top and bottom or one side of the base fabric may be used, and in this case, the felt may be wound around the core. Alternatively, a felt obtained by heating and shrinking the obtained felt at a temperature below its melting point may be used.

The web layer preferably has a basis weight of 250 for the present invention.
~2500 g/m2 and a thickness of 0.5 to 5 mm are preferred. In particular, it is preferable to form a nonwoven fabric by needle punching fibers having a fiber diameter of 5 to 100 μm.

The cloth used in the present invention preferably has a basis weight of 100 to 650 g/m2 and a thickness of about 0.1 to 1 mm. It may be a mono- or multifilament woven fabric (plain weave, twill weave), or a knitted fabric. The yarn diameter is preferably 100 to 1000 deniers.

The web layer is preferably wound 2 to 30 times.

Particularly preferred is a configuration in which web layers (1) are provided on both sides of the fabric, as shown in FIG. FIG. 3 is a schematic partial sectional view of the cartridge of the present invention.

When using a nonwoven fabric as the web, needle punched nonwoven fabric is particularly preferred. Since the needle-punched nonwoven fabric does not contain an adhesive within the nonwoven fabric, the adhesive does not elute with the liquid to be treated and the nonwoven fabric does not peel between fibers. Therefore, there is no problem of impurities leaching into the egg liquid, and the durability is very high.

The winding tension of the P material (web and cloth) onto the core is at least 0.5 kg/cm2 or more, usually 1 to 4 kg.
/cm". If it is lower than 0.5 kg/cm2, it becomes difficult to roll up the nonwoven fabric into a compacted state without any gaps.

The edges of the rolled up door material are sewn or fused with a suitable filament (4). An adhesive that is not corroded by the liquid to be treated may be used for adhesion.

End caps are fitted onto both ends of the obtained spiral filter material and heat fused.

At least one of the end caps has an opening (5) in the center as shown in FIG. The other may or may not have a central opening. Two side walls are provided on the outer periphery and inside the end cap, and a deep groove is provided in which the nonwoven filter layer and the core can be tightly fitted.

The depth of the groove may be approximately 3 to 20 mm. The thickness of the bottom of the end cap is suitably 1 to 5 mm.

In addition to bonding with an adhesive, the end cap and the door material part where the nonwoven fabric is wrapped around the core may be bonded by heating and fusing in a mold, or by using a spin welding method. Good too. Insert injection, extrusion, and the like may also be employed as a method for simultaneously molding the end cap and fusing it with the truss material.

The thickness filtration cartridge of the present invention may be covered with a wood net to protect the surface of the material. The net may or may not be glued to the end cap as long as it is placed over the door material before fitting the door material into the end cap.

The thickness filtration cartridge of the present invention has a repeating sparse and dense structure in the flow direction of the liquid in the filter door material, so it has a large flow rate and a high ability to capture particles, and is free from clogging and has a long life.

The material of the web or cloth used in the present invention is not particularly limited.

Examples of the web include natural fibers such as cotton and wool, fluororesin, nylon, polyester, polypropylene,
Synthetic fibers such as aramid and acrylic, recycled fibers such as rayon, metal fibers such as stainless steel, inorganic fibers such as glass, carbon, alumina, and phosphoric acid, etc. Fabrics include natural fibers such as cotton and wool, fluorine resin, and nylon. , synthetic fibers such as polyester, polypropylene, aramid, acrylic,
Regenerated fibers such as rayon, metal fibers such as stainless steel, inorganic fibers such as glass, carbon, alumina, silica, etc. can be used.

The thickness filtration power torridge of the present invention may be made of all fluororesin. Is this kind of cartridge thick enough to use normal resin such as sulfuric acid or hydrofluoric acid? The system that corrodes with excessive cartridges,
It is particularly useful in the semiconductor industry.

When used for this purpose, the core material should be PTFE.
SPFA, PEP, EPE, EPFE.

It is appropriate to use PCTFE, ECTFE, etc.

As the fluororesin web, PTFE, PFAXF'
EPSEPE, EPFE, PCTFESECTFE, etc.
Particularly preferred are PTFE and PFA.

Examples of fluororesin cloth include PTFE and PFA.

FEP, EPE, EPFESPCTFE, ECTFE,
In particular, PTFEXPFA and the like are suitable.

However, since fluororesin nonwoven fabrics do not adhere with adhesives and are difficult to fuse, it is preferable to cover both ends of the nonwoven fabric with a fluororesin film or simply insert a fluororesin film between the nonwoven fabrics. do. Fluororesin films include FEPlPFA, EPE, EPFE, and PCTF.
E, ECTFE, etc. may be used. These are particularly preferred for liquid-tightly welding the nonwoven fabric to the core and end cap. Film thickness is 10-100μm
These are commercially available and can be used appropriately. The film has a width of 3 to 10 m on the longitudinal side edge of the nonwoven fabric.
It is sufficient that they overlap by about m. This film may also be sewn or heat-sealed to the nonwoven fabric using fluororesin filaments in advance, but industrially, when the nonwoven fabric is wound around a core, the side edges of the nonwoven fabric are covered. It is preferable to intervene in the form of

When the end cap and the nonwoven fabric are fused together, these films melt and penetrate between the fibers at the side edge of the nonwoven fabric, reinforcing the side edge of the nonwoven fabric and contributing to the fusion bonding with the end cap. Therefore, in place of the film, fluororesin powder, thread, dispersion, etc. with high fusion properties may be used, but the film is most suitable in terms of uniformity of fusion bonding, workability, etc.

Sewing the film onto the non-woven fabric, fixing the non-woven fabric to the core,
PFA is used as the filament used to sew the lower nonwoven fabric at the final part of the rolled up nonwoven fabric.

FEP, EPESPTFE, ECTFESPCTFE,
Just use ECTPE etc. in moderation. A suitable filament thickness is 0.06 to Q.5 mm. After wrapping the nonwoven fabric around the core, the ends of the nonwoven fabric are sewn to the lower nonwoven fabric using filaments (4) and fixed, and then end caps are fitted to both ends of the resulting filter material as described above. The material of the cap in this case is PTFESPF.
A, PEPSEPE, EPFE, PCTFE, ECTF
E etc. are preferred.

The present invention will be explained below with reference to Examples.

Example 1 A porous cylindrical core made of PFA with an outer diameter of 36 mm and a length of 123 cm was coated with a PTF'E nonwoven fabric (with a width of 123 mm) shown in Table 1.
The longitudinal side edges of the web (which was obtained by intertwining the web with a needle punch on a base fabric) were covered with an EPE film having a thickness of 25 μm and a width of 18 mm and then rolled up, and the terminal end of the nonwoven fabric was sewn to the underlying nonwoven fabric.

The obtained cylindrical filter material was placed into a PFA end cap with an opening on one side and a PFA end cap with an open end on the other (bottom thickness 2.5 mm, side wall thickness 2 mm, groove depth 2 mm). 9mm) and heated in the mold at 330℃, approx. 1
Both ends were fused and solidified by heating under a load of kg for 30 minutes.

The obtained cartridge filter had an integrated nonwoven fabric, core, and end cap, and no leakage from the ends was observed even after continuous use for one week in concentrated sulfuric acid at 130°C.

Examples 2 to 5 Thickness transient cartridges were obtained in the same manner as in Example 1 using the nonwoven fabrics shown in Table Summer.

Comparative Example 1 A cartridge with a thickness of I was obtained using a nonwoven fabric without a base fabric shown in Table 1 using a dollar punch.

Example 6 Using the thick aperture cartridges obtained in Examples 1 to 5 and Comparative Example above, 0,5 kaolin clay was added in ethanol.
The liquid in which ppm was dispersed was flowed at 5 times per minute.

The results obtained are shown in Table-1.

Effects of the Invention The thick transient cartridge of the present invention has a higher particle removal rate than the thick filter cartridge without a cloth layer. In addition, the amount of particles is large and clogging due to particles is less likely to occur.

[Brief explanation of drawings]

FIG. 1 is a partial vertical cross-sectional view of the cartridge of the present invention, FIG. 2 is a cross-sectional view, and FIG. 3 is a schematic cross-sectional view of the door material. (1)...web, (2)...cloth, (3)...
·core. Figure 1 Figure 2 Figure 3

Claims (1)

[Scope of Claims] 1. A thick filtration cartridge having a filter medium layer formed by laminating at least one set of a web layer and a cloth. 2. The thickness filtration cartridge according to item 1, which has a filter medium layer formed by intertwining a web layer with a needle punch on a base fabric. 3. Thickness filtration cartridge according to paragraph 1, wherein the cloth and web are wound on the core so that they form alternating layers. 4. The thickness filtration cartridge according to item 1, wherein the web has a basis weight of 250 to 2500 g/m^2. 5. The thickness filtration cartridge according to item 1, wherein the cloth has a basis weight of 100 to 650 g/m^2. 6. The thickness filtration cartridge according to item 1, which is made of a fully fluororesin.