B - Operations – Transporting – 29 – C
Patent
B - Operations, Transporting
29
C
B29C 49/04 (2006.01)
Patent
CA 2582193
The object of the invention is a method for the extrusion of preforms (1), which exit from a die gap of an extrusion head (4) delimited by a mandrel (2) and a die ring (3), and are widened in a blow mold (5). The width of the die gap is changed during the extrusion of the preforms, by means of a setting movement of the mandrel and/or of the die ring. The cross-sectional geometry of an elastically deformable sleeve (9) disposed on the extrusion head (4) and delimiting the die gap on the circumference side is also changed during the extrusion of the preforms. By means of setting movements of an additional element (10) that is controlled or regulated separately, the melt distribution on the circumference side is changed at least in that section of the preforms (1) that is widened to form an upper barrel end in the blow mold (5). In this connection, the deformation of the sleeve (9) and the setting movements of the additional element (10) are coordinated with one another in such a manner that the upper region of the barrels widened in the blow mold has no deviations in thickness from default values in the circumference direction.
Feuerherm Harald
Mcfadden Fincham
LandOfFree
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