Tea-bag with bag part containing expansion slits and pull-out fold and enclosed core volume

摘要

The tubular bag part (3) when brewing occupies a greater volume than when dry. The bag is made of aroma-permeable material in which are several expansion slits which widen out during the brewing process when the cross-section of the openings is smaller than the tea-leaves (4). The bag part encloses a core-volume (8) and has a pull-out fold (6) forming a brewing bag and extending lengthwise.