| http://www.w3.org/ns/prov#value | - The preferable material of the first seal layer 12 may include plastic films such as polyethylene, ethylene vinylacetate copolymer, ionomer resin, and polybutadiene film; and heat-sealing adhesives such as hot melt adhesives, hot melt emulsions, ionomer latecies, polyethylene emulsions and ethylene vinylacetate emulsions.
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