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