PACKETS AND THEIR MANUFACTURE

摘要

Infusion packets (T) have envelopes of heat-sealable material with a looped thread (8) within the packets to wring moisture from the packet in use. A central part (8a) of the thread loop is held in a widened region of one edge seal (12) while the ends (8b, 8c) of the loop project through the opposite edge seal (14) in which they are movable when the loop is to be contracted. The packets are produced by forming a continuous series of thread loops on one elongate web and placing doses of infusion material on a second elongate web before bringing the webs together with the thread loops and infusion material between them. The two webs are then welded together and the individual packets are separated from the joined webs.