초록 ▼

Undesired substances are removed from a gas or vapor stream containing same by a gas-vapor treating mat composed of glass fibers intermixed with micro-bits of any of an expanded thermoplastic styrene-polymer or expanded thermoplastic lower polyolefin or flexible foam polyurethane and a compatible or

Undesired substances are removed from a gas or vapor stream containing same by a gas-vapor treating mat composed of glass fibers intermixed with micro-bits of any of an expanded thermoplastic styrene-polymer or expanded thermoplastic lower polyolefin or flexible foam polyurethane and a compatible organic bonding agent, which mat may contain one or more additives from the group of fibers of a fiber-forming terephthalate polyester, activated carbon particles, gas-vapor adsorbent zeolite particles or crystalline molecular sieve particles.

대표청구항 ▼

A method for separating undesired substances from a gas or vapor containing same, said method comprising passing a stream of said gas or vapor having said undesirable substances entrained therein through a porous medium comprising glass fibers from about 6.35 millimeters long to below a length at wh

A method for separating undesired substances from a gas or vapor containing same, said method comprising passing a stream of said gas or vapor having said undesirable substances entrained therein through a porous medium comprising glass fibers from about 6.35 millimeters long to below a length at which said fibers are prone to roping, and from about 3 to 12 microns in diameter, intermixed with micro-bits of any of an expanded, thermoplastic styrene-polymer, or lower polyolefin, which is the polymer of an ethylenically unsaturated hydrocarbon monomer having from 2 to 6 carbon atoms, each said polymer being non-brittle in its initial expanded form, said polymer micro-bits being from about 40 to about 325 microns long and from about 20 to about 325 microns wide, substantially completely free of intact cells of the expanded polymer from which said micro-bits were produced, substantially without any uniformity in outline of the individual micro-bit particles, and having a density from about 85 percent of, to about substantially the same as, the specific unexpanded polymer from which there was provided the aforesaid expanded thermoplastic polymer from which said micro-bits were produced, said intermixed glass fibers and polymer micro-bits being permeable to a gaseous and/or vaporous fluid stream and held together in sheet or elongated web form by a binding agent selected from (a) a compatible organic binder insoluable in cold water and soluble in hot water and inert to the glass fibers, the micro-bits and any other constituent of said medium, as well as any gas or vapor or entrained droplets or aerosols and fine particles that are to contact said medium, or (b) a cobeat of cotton fibers and any of said micro-bits, or a mixture of binding agents (a) and (b), said binding agent being distributed throughout the micro-bits and glass fibers so as to hold said micro-bits and glass fibers together in said sheet or elongated web form without destroying the permeability thereof; the constituents being in the following proportions, by weight of said medium: (i) from about 2 to about 50% of said micro-bits; (ii) from about 2% to about 10% of said binding agent when the organic binder is used, and from about 5.8% to about 11% of said binding agent when the cobeat binder is used, and (iii) the balance of said medium being made up of said glass fibers; said medium having tensile strength from about 0.9 to about 5.3 kilograms per centimeter, and thereby separating said undesired substances from said gas or vapor.