METHOD AND APPARATUS FOR WRAPPING OBJECTS WITH A SEALABLE WRAP

摘要

TITLE METHOD AND APPARATUS FOR WRAPPING OBJECTS WITH A SEALABLE WRAP A parallelogram linkage controls the speed of a sealing and cutting bar while in engagement with a polyethylene wrap while the wrap is being sealed around an object moving along a conveyor. The linkage assures synchronism between the speeds of the sealing and cutting bar and a resilient roller between which the wrap is pressed during sealing and cutting. Pressure on the sealing and cutting bar is controlled by an adjustable but controllable air pressure link. Sealable wrap is uniquely stored on the top and bottom sides of the conveyor such that it may be freely released when the object engages a web formed by the initial sealing of the two wraps together at a wrapping station. Once the wraps have been cut and sealed to form a new web at the rear of the previously wrapped object, the web is drawn back to position it for engagement by the next object in the path. Also disclosed is the method of accumulating lightweight polyethylene-type films so that they may be easily pulled from the storage position for wrapping around an object moving along a path.