A - Human Necessities – 24 – D
Patent
A - Human Necessities
24
D
131/17, 131/80
A24D 3/00 (2006.01) A24D 3/08 (2006.01)
Patent
CA 1130690
Abstract A filtering structure is made from a fibrous mass comprising an homogeneous mixture of fibres of different types. Some of the fibres are thermofusible synthetic fibres having a low melting point and adhesive properties in the molten state, and the others are absorbent with respect to harmful products of tobacco smoke and stable at the melting temperature of the thermofusible fibres. The fibrous mixture is shaped into a cylindrical rod which is in a state which is not yet coherent but homogeneous and comprises fibrous networks which are closely imbricated relative to each other. According to the invention, the process comprises employing a substantial proportion of thermofusible fibres relative to the absorbent fibres, bringing the fibrous mixture to a temperature which leaves the absorbent fibres intact but which is high enough to melt and fluidify all the thermofusible material which, initially present in the form of fibres, is converted into fine droplets dispersed in the network of absorbent fibres. This conversion creates, on one hand, multiple connections at the crossing points of the absorbent fibres, which remain stable and, on the other hand, a network of pores which intercommunicate in all directions and are constituted by the spaces left empty upon the melting of the thermofusible fibres. This process is applicable in particular to the production of a filtering structure for cigarette filters.
357092
Ridout & Maybee Llp
Societe Job Anciens Etablissements Bardou-Job & Pauilhac
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