초록 ▼

There is provided a vacuum cleaner filter medium which is a nonwoven spunbond web of conjugate spunbond fibers. The web has a Frazier permeability of at least 250 CFM, an NaCI efficiency of at least 65 percent, a Gurley Stiffness of at least 20 mg, and a pressure drop of 0.5 or less mm H2O. The conj

There is provided a vacuum cleaner filter medium which is a nonwoven spunbond web of conjugate spunbond fibers. The web has a Frazier permeability of at least 250 CFM, an NaCI efficiency of at least 65 percent, a Gurley Stiffness of at least 20 mg, and a pressure drop of 0.5 or less mm H2O. The conjugate fibers are made from polymers, more particularly polyolefins, still more particularly polypropylene and polyethylene in a side-by-side configuration. The filter medium is treated by a hot-air knife and through-air bonded during the production process. The medium is also electret treated. The medium has sufficient stiffness to be converted into a filter by conventional techniques. While this invention is directed mainly to air purification and filtration, other gasses may be filtered as well.

대표청구항 ▼

A filter for vacuum cleaners comprising a nonwoven web of spunbond conjugate fibers having a Frazier permeability of at least 250 CFM, an NaCI efficiency of at least 65 percent, a pressure drop of 0.5 or less mm H2O, and a Gurley Stiffness of at least 20 mg, wherein said web has been subjected to ho

A filter for vacuum cleaners comprising a nonwoven web of spunbond conjugate fibers having a Frazier permeability of at least 250 CFM, an NaCI efficiency of at least 65 percent, a pressure drop of 0.5 or less mm H2O, and a Gurley Stiffness of at least 20 mg, wherein said web has been subjected to hot air knife treatment.