Method of packaging perishable foods

Claim 1

IN THE METHOD OF PACKAGING LOAVES OF BREAD WRAPPED WITH A FLEXIBLE SHEET WRAPPER EXTENDING ABOUT THE RESPECTIVE LOAVES AND PROVIDED WITH OVERLAPPING FOLDS OVER AN END PORTION OF EACH LOAF, AND WHEREIN SUCH FOLDS ARE SEALED BY A SEALING SHEET HAVING A THERMOPLASTIC HEAT SEALABLE COATING THEREON, THE SEALING SHEET IS APPLIED TO THE FOLDS WHILE THE LOAF IS MOVING BY MOVING THE SHEET ONTO THE FOLDS IN A DIRECTION TRANSVERSE TO THE PLANE OF THE FOLDS, AND HEAT AND PRESSURE IS APPLIED TO THE SEALING SHEET TO EFFECT BONDING OF THE SEALING SHEET TO THE FOLDS, THE STEP OF APPLYING OVER SAID FOLDS A SEALING SHEET CARRYING A COATING COMPOSITION CONSISTING ESSENTIALLY OF A HOMOGENEOUS BLEND OF AT LEAST 50% BY WEIGHT POLYETHYLENE AND THE REMAINDER ADDITIVE MATERIAL IMPARTING TO THE COATING DECREASE IN MELTING POINT AND VISCOSITY, AND INCREASE IN TACKINESS AT ABOUT ITS MELTING POINT COMPARED TO THE POLYETHYLENE ALONE, SAID COATING BEING IN THE FORM OF DISCRETE PROJECTIONS TO MINIMIZE LATERAL SLIPPAGE OF THE SHEET WHEN THE SHEET IS APPLIED TO THE FOLDS, SAID COATING PROJECTIONS BEING OVER OPPOSITE SIDE PORTIONS OF THE SHEET AS WELL AS INTERMEDIATE PORTIONS OF THE SHEET BETWEEN SAID OPPOSITE SIDE PORTIONS, SAID POLYETHYLENE HAVING A MELTING POINT OF ABOUT 200* TO 220*F., A MOLECULAR WEIGHT OF ABOUT 1,500 TO 14,000, A DENSITY OF ABOUT 0.905 TO 0.930, AND A VISCOSITY OF ABOUT 600 TO 7,000 CPS. AT 300*C., AND SAID ADDITIVE REMAINDER BEING A RESIN OF THE GROUP CONSISTING OF GLYCERYL ESTERS OF FATTY ACIDS, POLYMERS OF POLYBUTENES, GLYCEROL ESTERS OF HYDROGENATED ROSIN, HYDROCARBON RESIN, POLYAMIDE RESIN, POLYTERPENE RESIN, AND ROSIN.