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