Extrusion blow molding is a process for manufacturing hollow bodies. These can be round, angular, or oval and also have handles, as on the familiar detergent or drinking bottles. In contrast to injection stretch blow molding, extrusion blow molding is a continuous, one-level process. Polyolefins such as LDPE, HDPE, and PP are the most typical materials used.

Hollow body, full color

Effect pigments are excellently suited to the extrusion blow molding process, since the extrusion process guarantees that platelet-shaped effect pigments are aligned evenly with the surface so they can develop their full optical effect.

Co-extrusion is an efficient option for combining high coverage and good effects. Strong pearl luster and other effects can be achieved with a thin outer layer, while the desired opacity is created by the covering inner layer.