SEALED-STRETCH-SHRINK-PACKAGING METHOD FREE FROM UNSHRINKED PART

PROBLEM TO BE SOLVED: To prevent an unshrinked part from occurring on a heat-shrinkable film resulting in a 'keloidal part' by covering a synthetic resin film over an object to be packaged mounted on a tray, and further by heat-shrinking after hermetically wrapping it with a heat-shrinkable film. SOLUTION: When an object to be packaged swells higher than a side wall of a tray or when the object is adhesive or viscous so that it attaches to a heat-shrinkable film when in contact, a transparent and stiff synthetic resin film, for example a polystyrene resin of polypropylene resin film is put over the object mounted on the tray, and after it is hermetically packaged by a heat-shrinkable film, the heat-shrinkable film is heat-shrunk. Further, in order to prevent the synthetic resin film put over the object from fogging by water drops, a defogging agent is preferably applied or mixed into the synthetic resin films.