Filter medium
AssigneeToray Industries, Inc.
InventorsKenko Yamada, Motoki Nagase
Life of this patent
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Abstract
The filter fabric containing polyphenylene sulfide fibers, characterized in that the following (1) and/or (2) is satisfied is used to provide a filter fabric and a bag filter composed of the filter fabric excellent in dust-collecting efficiency and high in mechanical strength: (1) Containing at least two webs, one of which on the dust side contains 50 wt % or more of heat resistant fibers with a fiber, diameter of 15 μm or less, while the other web on the clean side contains 50 wt % or more of heat resistant fibers with a fiber diameter of 20 μm or more (2) Containing a web containing polyphenylene sulfide staple fibers with their fineness kept in a range from 1 to 3 dtex and fluorine-based staple fibers with their fineness kept in a range from 2 to 4 dtex.
Claims15
A filter fabric containing polyphenylene sulfide fibers comprising at least two webs forming a dust side and a clean side, wherein the web of the dust side comprises 30 wt % or more of a first set of heat resistant fibers with a fiber diameter of 10 to 15 μm and 20 wt % or more of a second set of heat resistant fibers with a fiber diameter of less than 10 μm, and the web of the clean side comprises 50 wt % or more of heat resistant fibers with a fiber diameter of 20 μm or more.
A filter fabric which comprises a web containing polyphenylene sulfide staple fibers having a fineness of 1 to 2.3 dtex and fluorine-based staple fibers having a fineness of 2.5 to 4 dtex.
Dependencies are inferred from the claim text.