Method of and means for facilitating a sealing of end flaps of a film

Claim 1

In a sealing apparatus for heat sealing upper and lower end flaps at the left and right-hand openings of a bag of a film having insufficient rigidity to be form-sustaining and containing an object, and said apparatus having a conveyer to transfer the bag wrapped around and sealed along at least the back of the object to be wrapped to a predetermined position where the upper and lower end flaps are to be secured together, means for facilitating sealing of the end flaps of the bag comprising a vertically movable pressure plate movable toward and away from said conveyer to press the bag and the object against the conveyer when it reaches said predetermined position, and two pairs of upper and lower seal bars, one for said left-hand and one for said right-hand opening, said paired bars being movable between an operative position in which they pinch the corresponding upper and lower end flaps to effect the sealing thereof and an inoperative position, said pressure plate having an air passage therein and air blast nozzles thereon extending substantially horizontally toward the left and right-hand upper end flaps along the top of the bag, and an air supply pipe connected to said air passage.