Tobacco smoke filter
阅读：263发布：2023-03-27
专利汇可以提供Tobacco smoke filter专利检索，专利查询，专利分析的服务。并且A method and apparatus for making tobacco smoke filter means having totally enclosed inner cavities surrounded completely by the filtering material. Selected cavities may be filled with a sorbent smoke-modifying additive or the like in order to provide both gas phase filtration and solid phase filtration to the resultant product. Filter rods are manufactured by utilizing a reciprocating mandrel which is timed to the movement of a filtering material, such as a continuous cellulose acetate filamentary tow, through processing stations, particularly a steam-treating bonding station, with an annular wall of smokepermeable bonded fibrous members of the filtering material being formed when the mandrel is in its forward-most position extending at least to the point where the bonding agent contacts the filtering material. At the rearward-most portion of the stroke of the mandrel the filtering material is permitted to extend transversely completely across the bonding zone before being contacted with the steam so as to form a smoke-permeable plug of filtering material before and after the annular wall portions, thereby defining the internal cavities. Selected cavities may be partially or completely filled with an additive passing through the mandrel which can be hollow, as the mandrel is withdrawn during its rearward stroke.，下面是Tobacco smoke filter专利的具体信息内容。
1. A method of making smoke filter means comprising: a. providing a bondable filtering material including a multiplicity of fibrous members; b. continuously passing said filtering material into and through an elongated bonding zone and, intermediate the passage of said filtering material through said bonding zone, contacting same with a bonding agent 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; c. during the passage of said filtering material through said bonding zone, positioning a mandrel generally axially of said bonding zone to define an annular space through which said filtering material must pass; d. reciprocating said mandrel in timed relationship to the passage of said filtering material through said bonding zone between a first position, at least as far forward in the path of travel of said filtering material as the point at which said filtering material is contacted by said bonding agent, to thereby produce a smoke-permeable annular wall of bonded fibrous members as said filtering passes said point, and a second position, 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 of bonded fibrous members as said filtering material passes said point, said annular wall and said plug being integral with each other, whereby said rod is provided with intermittent internal cavities totally enclosed and surrounded by said annular wall and by plugs forwardly and rearwardly thereof; e. overwrapping said rod with an overwrapping material so as to juxtapose portions of the inner surface of said overwrapping material with continuous peripheral portions of the exterior surface of at least portions of selected plugs to form sealed areas precluding passage of smoke thereacross; and f. transversely severing said overwrapped rod at selected locations to form filter elements each of which includes at least one of said internal cavities and at least one of said sealed areas.
2. A method according to claim 1 wherein said filtering material comprises cellulose acetate tow and said bonding agent comprises steam.
3. A method according to claim 1 further including the step of feeding a quantity of a sorbent smoke-modifying material through the mandrel during the rearward movement of the mandrel to at least partially fill selected internal cavities with the smoke-modifying material as said internal cavities are formed.
4. A method according to claim 3 wherein said smoke-modifying material comprises activated carbon.
5. A method according to claim 1 further including the step of crimping selected portions of said rod before overwrapping same to form external cavities between the exterior surface of said rod and the interior surface of said overwrapping material.
6. 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 bonding 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 bonding agent, to thereby produce a smoke-permeable annular wall of bonded fibrous members as said filtering material passes out 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 of bonded fibrous members as said filtering material passes said point, said annular wall and said plug being integral with each other, whereby said rod is provided with intermittent internal cavities totally enclosed and surrounded by said annular wall and by plugs forwardly and rearwardly thereof; g. means for overwrapping said rod with an overwrapping material so as to juxtapose portions of the inner surface of said overwrapping material with continuous peripheral portions of the exterior surface of at least portions of selected plugs to form sealed areas precluding passage of smoke thereacross; and h. severing means for transversely severing said overwrapped rod at selected locations to form filter elements each of which includes at least one of said internal cavities and at least one of said sealed areas.
7. An apparatus according to claim 6 wherein said means defining a bonding zone comprises a cylindrical portion and a juxtaposed conical entry portion rearwardly of said cylindrical portion in the path of travel of said filtering material, said means for feeding said bonding agent into said bonding zone comprising a multiplicity of peripherally spaced apertures opening into said cylindrical portion, said forward end portion of said mandrel means in said first position being located at least as far forwardly into said cylindrical portion of said bonding zone as the points at which said bonding agent is fed into said bonding zone, and said forward end portion of said mandrel means in said second position being located within said conical portion of said bonding zone.
8. An apparatus according to claim 6 wherein said mandrel means is hollow, further including a source of a sorbent smoke-modifying material, and means for feeding said smoke-modifying material through said mandrel means and out of said forward end portion thereof into the cavities being defined in said rod on the rearward stroke of said mandrel means.
9. An apparatus according to claim 6 further including crimping means for crimping selected portions of said rod prior to overwrapping same ty form external cavity means between the outer surface of said rod and the inner surface of said overwrapping material after rod has been overwrapped.
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