Beverage infusion packages and materials therefor

摘要

A beverage infusion package (e.g. a tea bag) is formed of porous, fibrous cellulosic material and has a closure seam produced by a mechanical compression action without heat sealing. The porous material contains thermoplastic fibres which are amorphous or are only partially crystalline and which make the package eminently suitable for infusion in a microwave oven. The porous, fibrous material may have a basis weight of 10 to 30 g m-2 and be comprises of a single wet-laid layer of an admixture of cellulosic fibres and the thermoplastic fibres.