Patent ID: 6364518
Filing Date: 2002-04-02
Classification: B29C,B29K

Abstract:
An apparatus for producing a plastic that contains an additive, said apparatus comprising:a housing structure having a first bore, a second bore, an inlet for introducing the plastic into the first bore, and an outlet leading from the first bore, a first feed opening is provided in the housing structure for introducing a first additive into the second bore, the housing structure further having a first opening and a second opening providing separate passages between the first bore and the second bore; a pre-plastifying worm within the first bore and having a first worm section which transfers plastic between the inlet and the first opening and forces the plastic through the first opening, and the pre-plastifying worm having a second worm section which carries the plastic through the first bore from the second opening to the outlet; and a secondary worm within the second bore of the housing structure for combining the first additive with the plastic to form a mixture that is forced from the second bore through the second opening.