Apparatus and process for producing cold seal in plastic bags

A process of cold sealing two layers of plastic film material together comprising the steps of:

• forming a plastic bag, the plastic bag including
• a front panel of plastic film having two substantially parallel side edges;
• a rear panel of plastic film having two substantially parallel side edges;
• a fastening of the front panel and rear panel for forming a continuous periphery to the bag;
• and,
• a bottom joining a bottom of the front panel, and a bottom of the rear panel at substantial right angles to the side edges of the front panel and rear panel;
• whereby the bag has a closed bottom, a continuous closed periphery, and an open top;
• an improvement providing the bag with a cold seal which does not form a part of the closed bottom, continuous closed periphery of the bag and open top, the process comprising the steps of:
• juxtaposing at least first and second plastic films of the bag to one another in a disposition for sealing;
• providing at least one compression die on at least one side of the juxtaposed at least first and second plastic films, the compression die having the size and shape of the cold seal desired;
• impressing the compression die across the juxtaposed first and second plastic films to produce a temperature and pressure sufficient to fuse the at least first and second plastic films together, the impressing having insufficient temperature and pressure to permanently fuse the first and second plastic films together so that the films when separated at the cold seal each retain structural integrity.