application insights

Extrusion Molding (EBM)

WHAT IS EXTRUSION MOLDING

Did You Know?

Extrusion Molding (EBM) forms hollow plastic parts by extruding a hot tube of polymer (a parison) and inflating it inside a cooled mold to the final shape. It is widely used for bottles, jugs, and jerrycans, and can be configured for single‑ or multilayer structures.

At-A-Glance Facts:

  • Also called: extruded molding; continuous or accumulator EBM
  • Typical where: packaging (HDPE/PP bottles, jugs), chemicals/agro (UN containers), and industrial parts
  • Key inputs/components: extruder, die/head, parison control (time/position‑based thickness profiling), clamp, blow pins, cooled mold, deflash
  • Quality risks to watch: wall‑thickness variation from parison sag, pinch‑off seam weakness, and environmental stress cracking (ESCR) in some HDPE applications