Blow Molding

In blow molding, hollow products are formed by extruding a heated thermoplastic tube (parison) into a mold, and, under air pressure, expanding the parison to match the inner contours of the mold.

Process Characteristics

Inflates a softened parison tube to the contour of a mold cavity
Uses thermoplastics
Forms thin-walled hollow products
Parting lines are present
Wall thickness can be increased by increasing the parison tube wall thickness
Flash is present but is minimal

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Information provided is from Manufacturing Processes Reference Guide by Robert H. Todd, Dell K. Allen, and Leo Alting.--1st ed. Published by Industrial Press Inc., 1994.