Abstract: An object of the present invention is to provide a channel material which, when introduced as a liquid separation membrane module, is capable of retaining the salt removal rate of a separation membrane even when a high pressure acts from the supply side through a reverse osmosis separation membrane, and which has a small thickness. The channel material is a channel material for a liquid separation membrane module which includes a tricot fabric formed by knitting synthetic fibers. The tricot fabric has a convex portion formed by a double loop, and the long side length of an opening formed inside the double loop is 50 to 260 ?m. In addition, in the liquid separation membrane module, at least the reverse osmosis separation membrane and the channel material are wound around a central tube.

Abstract: A nonwoven fabric suitable for electrical insulation or as a battery separator is provided. The nonwoven fabric includes a PPS fiber, the nonwoven fabric being obtainable by a process for papermaking and having a front surface with a water contact angle greater than that of a back surface of the nonwoven fabric by 5° or more. A suitable method for producing the nonwoven fabric includes dispersing an undrawn polyphenylene sulfide fiber in water, depositing the fiber to form paper, and performing heat and pressure treatment with a calender having two rolls with surface temperatures different by 10° C. or more.

Abstract: A nonwoven fabric suitable for electrical insulation or as a battery separator is provided. The nonwoven fabric includes a PPS fiber, the nonwoven fabric being obtainable by a process for papermaking and having a front surface with a water contact angle greater than that of a back surface of the nonwoven fabric by 5° or more. A suitable method for producing the nonwoven fabric includes dispersing an undrawn polyphenylene sulfide fiber in water, depositing the fiber to form paper, and performing heat and pressure treatment with a calender having two rolls with surface temperatures different by 10° C. or more.

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 ?m 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 ?m 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.

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 ?m 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 ?m 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.