Patent ID: 7878962

Claim:
A method for manufacturing cigarette filter subassemblies, comprising the steps of: providing a series of absorbent members; providing at least one capsule between adjacent absorbent members, said at least one capsule containing a fluid material for modifying characteristics of tobacco smoke during smoking of the cigarette, said at least one capsule releasing at least a portion of the fluid material when the at least one capsule is subjected to external force; providing an outer cover about said series of absorbent members and said at least one capsule provided between adjacent absorbent members, said outer cover being formed of a material which is substantially impermeable to said fluid material of said at least one capsule; and providing an annular layer of fibrous material about the outer surface of said outer cover, wherein the annular layer of fibrous material is isolated by the outer cover from liquid material released from the at least one capsule when ruptured, wherein said annular layer of fibrous material comprises steam-set cellulose acetate.