JPH0512964B2 - - Google Patents

Description

[Detailed description of the invention]

FIELD OF INDUSTRIAL APPLICATION The present invention relates to an overthick cartridge having a novel configuration. Prior Art Various types of over-thick cartridges have been developed in the past. One type is one in which thread is wound multiple times around the core surface for the liquid passage, and the other type is a nonwoven fabric (without a base fabric) in which fibers are entangled with each other by needle punching, and is wound around the core. It is something that The former has relatively high overaccuracy, but the amount of particles retained in the processing liquid is small. It's also expensive. The latter is
Although relatively inexpensive, overaccuracy is not always sufficient. OBJECTS OF THE INVENTION An object of the present invention is to provide a non-woven fabric wound type over-thickness cartridge with high over-accuracy. Structure of the Invention The present invention has a basis weight as shown in FIGS. 1 and 2.
The present invention relates to an over-thickness cartridge having an overlayer of 100 to 650 g/m ² of cloth and non-woven fabric wound in alternating layers on a cylindrical porous core in at least two spiral turns. The present invention will be explained based on FIGS. 1 to 3. FIG. 1 shows a partial longitudinal sectional view of the cartridge of the present invention, and FIG. 2 shows a cross sectional view. The cylindrical core 3 of the present invention allows normal liquid to pass therethrough, and its dimensions may be set based on desired standards. Normally, standard values are set for outer diameters of 35 to 36 mm and lengths 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 superlayer of the present invention includes not only a nonwoven fabric layer but also a fabric layer, forming a dense and dense structure. This results in better results in terms of overaccuracy, overload and service life. When using felt without a base fabric in which fibers are needle-punched as the nonwoven fabric layer, the fabric may be superimposed on the felt and wound around the core. It is also possible to use felt made by needle-punching a nonwoven fabric on the top and bottom or one side of the base fabric, and in this case, the felt may be wrapped 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 preferred nonwoven fabric layer for the present invention has a basis weight of
Preferably, the weight is 250 to 2500 g/m ² and the thickness is 0.5 to 5 mm. In particular, a nonwoven fabric made of fibers with a fiber diameter of 5 to 100 μm by needle punching is preferred. The cloth used in the present invention preferably has a basis weight of 100 to 650 g/m ² 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. It is preferable to wrap the nonwoven fabric layer 2 to 30 times. Particularly preferred is a configuration in which nonwoven fabric 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. As the nonwoven fabric, 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 liquid, and the durability is very high. The winding tension of the material (nonwoven fabric and cloth) onto the core is at least 0.5Kg/cm ² or more, usually 1 to 4
Kg/ ^cm2 . If it is lower than 0.5 Kg/cm ² , it will be difficult to roll up the nonwoven fabric into a compacted state without any gaps. Attach the end of the rolled up material to a suitable filament 4.
Either sew or fuse. 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 resulting spiral overfill 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. The end cap is provided with two side walls on the outer periphery and inside thereof, and a deep groove into which the nonwoven fabric overlayer and the core can be tightly fitted. The depth of the groove may be about 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 material part where the nonwoven fabric is wrapped around the core and the end cap may be bonded by heating and fusing in a mold, or by using a spin welding method. good.
Further, as a method for simultaneously forming the end cap and fusing it with the material, insert injection, extrusion, etc. may be employed. The overthick cartridge of the present invention may be covered with a resin net to protect the material surface. The net may or may not be glued to the end cap, as long as it is placed over the material part before the material part is inserted into the end cap. The thick cartridge of the present invention has a repeating sparse and dense structure in the flow direction of the liquid in the filter 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 nonwoven fabric or cloth used in the present invention is not particularly limited. Non-woven fabrics include, for example, natural fibers such as cotton and wool, fluororesin, synthetic fibers such as nylon, polyester, polypropylene, aramid, and acrylic, recycled fibers such as rayon, metal fibers such as stainless steel, glass, carbon, alumina, Examples of cloth include inorganic fibers such as silica, natural fibers such as cotton and wool, fluorine resins, synthetic fibers such as nylon, polyester, polypropylene, aramid, and acrylic, recycled fibers such as rayon, and metal fibers such as stainless steel. Inorganic fibers such as glass, carbon, alumina, and silica can be used. The overthick cartridge of the present invention may be made entirely of fluororesin. Such cartridges are particularly useful in systems where thicker cartridges made of conventional resins such as sulfuric acid or hydrofluoric acid corrode, particularly in the semiconductor industry. When used for such purposes, the core material is
PTFE, PFA, FEP, EPE, EPFE, PCTFE,
It is appropriate to use ECTFE or the like. Fluorine resin nonwoven fabrics include PTFE, PFA,
FEP, EPE, EPFE, PCTFE, ECTFE etc. especially
PTFE and PFA are preferred. Fluorine resin fabrics include PTFE, PFA,
FEP, EPE, EPFE, PCTFE, ECTFE, especially
PTFE, PFA, etc. are suitable. However, since fluororesin nonwoven fabrics cannot be bonded with adhesives and are difficult to fuse, it is preferable to cover both ends of the nonwoven fabric with a fluororesin film or simply sandwich the fluororesin film between the nonwoven fabrics. insert. Fluorine resin films include FEP, PFA,
EPE, EPFE, PCTFE, ECTFE, etc. may be used. These are particularly preferred for liquid-tightly welding the nonwoven fabric to the core and end cap. Films having a thickness of 10 to 100 μm are commercially available and may be used appropriately. It is sufficient that the film overlaps the longitudinal side edges of the nonwoven fabric by about 3 to 10 mm in width. This film may also be sewn or heat-sealed to the non-woven fabric using fluororesin filament, but industrially, when winding the non-woven fabric around a core, the side edges of the non-woven fabric are It is preferable to intervene in the form of a coating. 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, instead of film, fluororesin powder with high fusibility,
Thread, dispersion, etc. may be used, but film is most suitable in terms of uniformity of fusion and workability. PFA,
FEP, EPE, PTFE, ECTFE, PCTFE,
ECTFE etc. may be used in moderation. A suitable filament thickness is 0.06 to 0.5 mm. After wrapping the nonwoven fabric around the core, the ends of the nonwoven fabric are sewn to the underlying nonwoven fabric using the filament 4 and fixed, and end caps are fitted to both ends of the obtained overmaterial as described above. The material of the cap in this case is
PTFE, PFA, FEP, EPE, EPFE, PCTFE,
ECTFE 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, and a PTFE nonwoven fabric shown in Table 1 with a width of 123 mm (the nonwoven fabric was intertwined with the base fabric by needle punching).
The longitudinal side edges were covered with an EPE film 25 μm thick and 18 mm wide and rolled up, and the end of the nonwoven fabric was sewn to the underlying nonwoven fabric. The obtained cylindrical overfill material was fitted into an open PFA end cap on one side and an open PFA end cap on the other (bottom thickness 2.5 mm, side wall thickness 2 mm, groove depth 9 mm). Combined in the mold at 330℃, approximately 1Kg
Both ends were fused and solidified by heating under load for 30 minutes. The obtained cartridge filter is made of non-woven fabric,
The core and end cap are integrated,
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 Excessive thickness cartridges were obtained in the same manner as in Example 1 using the nonwoven fabrics shown in Table 1. Comparative Example 1 An overthick cartridge was obtained using a nonwoven fabric (needle punch) without a base fabric shown in Table 1. Example 6 Using the thick cartridges obtained in Examples 1 to 5 and Comparative Example above, a solution containing 0.5 ppm of kaolin clay dispersed in ethanol was flowed at 5 times per minute.
The results obtained are shown in Table-1.

[Table] Effects of the Invention The thicker cartridge of the present invention has a higher particle removal rate than the thicker cartridge without a cloth layer. In addition, the flow rate is large and clogging due to particles is less likely to occur.

[Brief explanation of drawings]

FIG. 1 is a partial vertical 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 material. 1...nonwoven fabric, 2...cloth, 3...core.

Claims (1)

[Scope of Claims] 1. Thickness overlayer having at least ^two turns of cloth and nonwoven fabric having a basis weight of 100 to 650 g/m 2 wound spirally around a cylindrical porous core so as to form alternating layers. Cartridge. 2. The thick cartridge according to item 1, which has an overlayer formed by intertwining a nonwoven fabric layer with a needle punch on a cloth. 3. The overthick cartridge according to item 1, wherein the nonwoven fabric has a basis weight of 250 to 2500 g/ ^m2 . 4. The overthick cartridge according to item 1, which is made entirely of fluororesin.