System for producing multi-layer extrudate

Details System for producing multi-layer extrudate System for producing multi-layer extrudate

B - Operations, Transporting

29

C

18/783

B29C 47/06 (2006.01) B29C 47/10 (2006.01) B29C 47/16 (2006.01) B29C 47/92 (2006.01)

Patent

CA 2025157

ABSTRACT OF THE DISCLOSURE For producing a multi-extrudate of thermoplastically processable plastic, a coextrusion adapter block has a multi-part slide having a plurality of side-by-side slide sections mutually spaced in a direction transverse to the flow direction and slidably fitted in the adapter block for movement to adjustably protrude into a secondary runner for adjusting the thickness of a molten extrudate therein. A multi-layer extrudate emerging from the adapter block is further extruded in an extrusion die, and the thickness of at least one layer thereof is measured at a plurality of positions along the width thereof. The width measurements are used to control the positions of corresponding slide sections so that the layer thicknesses can be accurately controlled during an extruding operation. 35/law

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