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Answer:
Plastic extrusion is the process through which plastic is heated and forced through a heated chamber by a screw.
Molding is the process of forcing plastic through a die to form the final shape of a product.
Cooling: The plastic extruded is chilled.
Spool or cut: The continuous form is either spooled or cut into lengths.
Mold construction: Small plastic pellets are melted and moulded into a hollow tube known as a parison or preform (depending on the blow molding subtype).
Molding: The parison is clamped into a mold and inflated with pressured air until it adopts the shape of the mold's interior.
Cooling and ejection: The item cools in the mold until it is firm enough to be expelled.
