Abstract: A heat sealing wheel assembly of a shrink wrap machine reduces thermoplastic film waste during the side cutting and sealing process. The relative diameters of the heat wheel and heating hub of the heat sealing wheel assembly are configured to create an annular region towards the outer circumference of the heat wheel. This creates a space to permit closer engagement of the gripping mechanism for grasping and guiding the edge of thermoplastic film next to the point of contact of the opposing heat wheel edges, and avoids the obstruction normally caused by the heating hub. The closer gripping engagement reduces the amount of film that must extend out from the point of sealing contact of the heat wheels, resulting in less waste during the side sealing process.

Abstract: Selectively reconfigurable shrink-wrap machine (30) for use with a loading device (34) for individually wrapping products (58) sequentially with shrink-wrap material (92) as delivered in sequence to the machine. It includes a sensor (62) sensing product position on the loading device. Shrink-wrap material is delivered from a roll at a wrapping station (40). A first conveyor (42) carries wrapped products between the wrapping station and a film sealing and cutting apparatus (44). First conveyor delivers products sequentially in synchronized velocity with the loading device in response to sensor signals. Film sealing and cutting apparatus has upper and lower heads (156, 164), at least one of which is driven into and out of engagement with the other between adjacent wrapped products received by the first conveyor for effecting a sealed cut between them. Heads are each maintained at a fixed angle of orientation. A second conveyor (43) receives wrapped products sequentially from the sealing and cutting apparatus.