Liquid purification or separation – Filter – Supported – shaped or superimposed formed mediums
Patent
1990-11-09
1993-08-31
Dawson, Robert A.
Liquid purification or separation
Filter
Supported, shaped or superimposed formed mediums
55498, 55520, 55527, 55DIG45, 210356, 2104165, 2104934, 428 363, B01D 2900
Patent
active
052406105
DESCRIPTION:
BRIEF SUMMARY
DETAILED DESCRIPTION OF THE INVENTION
1. Field of the Invention
The present invention relates to a flexible tubular filtering material with long service life which is capable of removing particles present in fluids, especially those particles present in liquids such as water, oil and fuel, and which is free of bending obstruction, and a flexible filter element wherein said filtering material is housed in a flexible casing.
2. Background of the Invention
Gas filters and liquid filters are used to remove particles present in fluids in a wide variety of fields including the mother machine and automobile industries. With the recent trend to performance sophistication and space saving, there have been increasing demands for improvement in the service life of filter elements used in these filters. Presently, to remove particles present in fluids, especially contaminant particles present in liquids such as water, oil and fuel, so-called sheet filtering materials such as filter paper comprising pulp and nonwoven fabrics comprising synthetic fiber are used. Specifically, the rose filter element is available wherein these sheet filtering materials are formed into a pleat to increase filtering area per element.
In the case of the rose filter element, limitation is posed on the improvement in filtering area per filter element, i.e., in the extension of the service life of the filter element, for example, because a ring cavity is needed at its center, and because increasing the number of ridges causes filtering material overlapping and thus makes the flow path extremely narrow.
It is also impossible to form a filter element into any form other than a cylinder because of the structure of the sheet filtering material used in the filter element.
Accordingly, the purpose of the present invention is to provide a flexible tubular filtering material for removal of particles present in fluids, especially those particles present in liquids, with long service life, which is free of bending obstruction and shows little textural change in the outer and inner peripheries of the curved portion even after the casing, which houses the filter element, is bent to any form.
DISCLOSURE OF THE INVENTION
Taking note of the braided cord, a flexible tube of small diameter permitting an increase in filtering area per filter element, the present inventors made investigations with the aim of obtaining a flexible filtering material which permits an increase in the service life of filter element and which is free of bending obstruction even after the casing which houses the filter element is bent into any form, and developed the present invention.
Accordingly, the flexible tubular filtering material of the present invention is a structure comprising a number of yarns braided into a cylindrical form while being spirally wound in both the right direction for some yarns and left direction for other yarns and also along with the longitudinal direction with the yarns intercrossed with each other.
In the present invention, one or more kinds of yarn constitute the flexible tubular filtering material. When using one kind of yarn, it is a short fiber assembly, e.g., a spun yarn or a multifilament or a 100- to 500-denier monofilament. When using two or more kinds, it is a combination of different yarns, e.g., a combination of spun yarn and filament yarn. Also, either yarn may be a 100- to 500-denier monofilament. In this case, the monofilament serves well to improve the dimensional stability of the flexible tubular filtering material against fluid pressure. If the monofilament is less than 100 denier, some problems arise such as insufficient dimensional stability and a lack of pressure endurance. If it exceeds 500 denier, gaps appear in the interface between different yarns, thus posing a problem of failure to capture particles.
Examples of the starting material for the monofilament for the present invention include polyester, polyolefin, polyamide, polyvinylidene fluoride, polyvinyl chloride, polyvinylidene chloride, polyacrylonitrile, polysulfone, pol
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Hayashi Toshiaki
Tani Yatsuhiro
Dawson Robert A.
Kim Sun Uk
Toyo Boseki Kabushiki Kaisha
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