he extrusion die for a polyethylene parison used in blow molding has a mean diameter of 20 mm. The size of the ring opening in the die is 1.5 mm. The mean diameter of the parison is observed to swell to a size of 22 mm after exiting the die orifice. If the diameter of the blow molded container is to be 160 mm, determine (a) the corresponding wall thickness of the container and (b) the wall thickness of the parison.

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Forming and Shaping

Metal forming is a category of metalworking process through which the material can be given the desired shape and size by subjecting it to plastic deformation, where the component undergoes bulk deformation process upon application of loads. Unlike the shearing and machining process, the material does not undergo up to a failure point as indicated in the stress-strain curve. Hence, the stresses induced during the forming process are greater than yield strength but less than the failure strength of the material. The process does not lead to the loss of material, so it can be said to be an economical process. During forming, the material is subjected to tensile forces, compressive forces, bending, and shearing loading conditions. The material should possess the property of ductility to undergo the forming process.