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Extrusion and stretch blow molding (MBE) is a relatively simple process basically used for hollow pieces (bottles for example) with uniform sides.

The process includes the following stages:

  1. The liquefaction of resin granules using a screw and machine barrel heated through high pressure.
  2. The extrusion of the melted material using a matrix head that forms a hollow tube of hot plastic material (parison).
  3. The preform is clamped in between the two halves of a mold that cover it.
  4. Compressed air is injected through the recipient’s neck.
  5. The mold is then opened and the final shape extracted.