摘要:
The present invention provides a composition in which a porous membrane is obtainable, which can suppress a decrease in the performance even when compressive force or the like is applied in a post step. The composition of one embodiment of the present invention containing polytetrafluoroethylene that can be fibrillated, a non-hot melt processable component that is not fibrillated, and a hot melt processable component with a melting point of lower than 320°C that is not fibrillated, wherein the hot melt processable component that is not fibrillated is contained at being equal to or more than 0.1% by weight but less than 20% by weight of the total.
摘要:
The present invention provides a filtering medium for an air filter which has a greatly increased dust retention amount while maintaining high collecting efficiency, a filter pack, an air filter unit, and a method for producing the filtering medium for an air filter. The filtering medium for an air filter of the present invention is provided with a first porous membrane and a second porous membrane mainly composed of a fluororesin. The second porous membrane is disposed on the downstream side of airflow compared to the first porous membrane. The first porous membrane has a dust retention amount of the polyalphaolefin particles when the air containing polyalphaolefin particles with a count median diameter of 0.25 µm is continuously passed through at a flow rate of 5.3 cm/sec, which is larger than that of the second porous membrane. The filtering medium for an air filter has a pressure loss of less than 200 Pa, a collecting efficiency for NaCl particles with a particle diameter of 0.3 µm is 99.97% or more, and the dust retention amount for the polyalphaolefin particles with a count median diameter of 0.25 µm is 25 g/m 2 or more.
摘要:
An electrical insulating plate (1), which comprises a base cloth (3) and a web layer (5), wherein the web layer (5) comprises a fluororesin fiber and is joined by entanglement with the base cloth and laminated on both the surfaces of the base cloth, and wherein at least one surface of the web layer (5) has been subjected to a heat treatment at the melting temperature of the fluororesin fiber or higher under pressure.
摘要:
A non−woven fabric which comprises fluororesin fibers as a primary component, wherein the fibers are intermingled with one another; the non−woven fabric which is further subjected to a pressurizing and heating treatment or to a stretching treatment. The non−woven fabric has excellent mechanical characteristics.