HEAT-RESISTANT CONTAINER AND PREPARATION THEREOF

PURPOSE:To provide a heat-resistant container wherein extraneous matters mixed in the content are easily detectable and passes a standard on an extraction test based on an ultraviolet spectrum by performing a molding processing of a laminated film prepd. by joining a polyester film wherein a deposited film of aluminum oxide is provided between a polyester film and a cast polypropylene layer. CONSTITUTION:A laminated film 2 is formed by joining a polyester film 12 o both faces of which deposited films 10 and 11 of aluminum oxide are provided between a polyester film 8 on one face of which a deposited film 7 of aluminum oxide is provided and a cast polypropylene layer 9 thorugh modified polypropylene layers 13 and 14. The polyester films 8 and 12 are positioned so as to position the deposited film faces 7 and 10 face to face and are joined together by means of extrusion lamination treatment of a modified polypropylene through a modified polypropylene layer 13. A cast polypropylene layer 9 is positioned on the deposited film 11 side of the deposited laminated film 15 and a plastic laminated film 2 is formed by extrusion lamination treatment.