A - Human Necessities – 24 – D
Patent
A - Human Necessities
24
D
131/80
A24D 3/00 (2006.01)
Patent
CA 1047351
ABSTRACT OF THE DISCLOSURE The invention provides an apparatus for making smoke filter means comprising, a. a source of a bondable filtering material including a multiplicity of fibrous members, b. means defining an elongated bonding zone, c. means for continuously feeding said filtering material into and through said bonding zone, d. means for feeding a bond activating agent into said bonding zone and into contact with said filtering material at a point intermediate the path of travel of said filtering material through said bonding zone to bond said fibrous members of said filtering material to each other at spaced contact points, thereby forming an elongated, smoke-permeable, rod defining a tortuous path for passage of smoke therethrough, e. elongated mandrel means having a forward end portion axially positioned within said means defining said bonding zone to define an annular space through which said filtering material must pass, f. means for reciprocating said mandrel means within said bonding zone in timed relationship to the passage of said filtering material through said bonding zone between a first position wherein said forward end portion extends at least as far forwardly in the path of travel of said filtering material as the point at which said filtering material is contacted by said bond activating agent, to thereby produce a smoke-permeable annular wall of bonded fibrous members as said filtering material passes said point, and a second position wherein said forward end portion extends sufficiently rearwardly of said point in the path of travel of said filtering material to permit a portion of said filtering material to extend transversely completely across said bonding zone before reaching said point, to thereby produce a smoke-permeable plug section of bonded fibrous members as said filtering material passes said point, said annular wall and said plug sections being integral with each other, whereby said rod is provided with intermittent inner cavities totally enclosed and surrounded by said annular wall and by plug sections forwardly and rearwardly thereof, g. forming means for forming outer cavity means on the exterior surface of said rod, said forming means producing outer cavity means axially spaced from each other at a position on either side of a transverse axis intermediate each inner cavity means with the surface area of said outer cavity means forming a minor portion of the total exterior surface of said rod, h. means for overwrapping said rod with an overwrapping material so as to juxtapose portions of the inner surface of said overwrapping material with peripheral portions of the exterior surface of said rod to form sealed areas precluding passage of smoke thereacross, and i. severing means for transversely severing said overwrapped rod at selected locations to form filter elements.
306036
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