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The Technology of Blow Molding
The procedures employed in the processing techniques of blow molding vary a great deal. Containers and tubes can be manufactured with the blow molding technique. Plastic granules are melted in an extruder and pressed through a tube head. A pin tip called "Torpedo" gives the heated plastic material the cross section of a circular ring.
The extruder's continuous feed creates a plastic tube. This tube has a temperature of approx. 180° C. This tube is placed into the blow molding tool. The closed blow molding tool swivels out and the tube is pressed to the outer walls of the mold by pressed air, like a balloon. The previously thick-walled plastic tube is stretched to form a thin-walled container. The plastic tube's heat is rapidly decreased by the water circulating in the blow mold. Following this cooling process, the mold opens and the molded part, removed. Depending on requirements, the product can now be finished in a conveyor station. (By product scrap is separated by sorting machines) The finished products is packed directly into suitable shipping containers.