FORMING TETRAHEDRAL PACKETS FROM TUBULAR WEB: WEB SEALED BY PERPENDICULAR OUT-OF-PHASE PAIRS OF IN-PHASE ROTORS

摘要

Packets are produced by forming a continuous web (W) of packaging material into a tubular form around a tube (4) through which the packet filling material is delivered, the individual packets being sealed and severed from the web as each dose of filling material is delivered. A valve (24) to control the dosing is provided at the exit end of the delivery tube. The sealing and severing of the packets is performed by mutually transverse pairs of rotors (36,38) the arms (92) of which interdigitate to make successive seals in mutually transverse directions, so forming tetrahedral packets.