Heat-sealable filter material

摘要

A heat sealable filter material including at least one first on-heat sealable site and at least two heat sealable sites including synthetic fibers and containing an adhesion aid is new. Independent claims are included for: (1) a process for preparation of the filter material within the framework of a wet process using an adhesion aid in amount 2-25 wt.% on the weight of one heat sealable site, including synthetic fibers; (2) a process for preparation of the filter material within the framework of a melt blown process in which a blend of fibers of heat sealable material and an adhesion aid is applied in amount 2-25 wt.% on the weight of at least one sealable site including synthetic fibers, to the first site, generally consisting of natural fibers.