prov:value
| - It is well known to treat plastic material, particularly polyolefins, as aforesaid, i.e., chemically, by flame, or by electric corona discharge, in order to enhance the bonding characteristics of the surface so that the polyethylene, polypropylene or other film would accept printing inks and other coating or printing materials. (See, for example, US Pat. 2,910,723, issued Nov. 3, 1959 to G. W. Tra
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