PRESSURE TIGHT HEAT RESISTANT CONTAINER AND ITS MANUFACTURE

PURPOSE:To obtain a pressure tight heat resistant container which can stand heat sterilization by providing the container with heat crystallized parts at the bottom center and mouth part of a container main body, and at the same time, giving drawing orientation crystallization to the shoulder, drum and bottom parts, which are from the lower bottom arc part to the upper shoulder part, among regions excepting the heat crystallized parts. CONSTITUTION:The central parts of the bottom surface of a container main body 1 is locally crystallized by heat by 20 to 50% and becomes a heat crystallized part 2. Also, a mouth part 3 is crystallized in the same manner, and the strength and heat resistance are improved. The heat crystallized parts 2 and 3 have an orientationless crystallization condition, which can not be drawn, and the strength is high, and a stable form is held. All the regions excepting the heat crystallized parts 2, 3 are made a highly drawn crystallized region which is drawn to be very thin by a high drawing rate. At all the regions of a shoulder part 10, drum part 8 and bottom part 9, which are from a lower bottom arc part 4 to an upper shoulder part 6, are highly drawing crystallized to a crystallization degree of 10 to 40%. By this drawing reaction, crystallizing orientation generates in the material, and the strength is great and the shape retentivity is also excellent.