Patent ID: 7384254

Claim:
A coextrusion adapter for an extrusion installation with a plurality of extruders and a tool for producing a composite coextrusion structure of thermoplastic material, wherein the coextrusion adapter ( 1 ) has a central conduit ( 10 ) with an end ( 100 ) at an inlet side for connecting an extruder and an end ( 101 ) at an outlet side for connecting the tool, the coextrusion adapter ( 1 ) has at least one coextrusion conduit ( 11 , 12 , 13 ) with an inlet end ( 110 , 120 , 130 ) and an outlet end ( 112 , 122 , 132 ), wherein a second extruder can be respectively connected to the inlet end ( 110 , 120 , 130 ), the outlet end ( 112 , 122 , 132 ) terminates downstream of the end ( 100 ) at the inlet side of the central conduit ( 10 ) in the central conduit, and adjusting devices are assigned to each of the outlet ends ( 112 , 122 , 132 ) of the at least one coextrusion conduit ( 11 , 12 , 13 ), which has a plurality of adjusting elements ( 6 ) that together extend over a width of the outlet end ( 112 , 122 , 132 ) and which can be adjusted independently of each other by actuating drives ( 7 ) in such a way that an inside diameter of the respective transverse section of the outlet end ( 112 , 122 , 132 ) can be changed, the coextrusion adapter comprising: at the end facing the outlet end ( 112 , 122 , 132 ) the adjusting elements ( 6 ) having a wedge-shape adjusting section ( 60 ) with one wedge surface ( 60 a ) facing the central conduit ( 10 ) and another wedge surface ( 60 b ) facing the outlet end ( 112 , 122 , 132 ) of the coextrusion conduit ( 11 , 12 , 13 ), the adjusting section ( 60 ) of the adjusting elements ( 6 ) pivotal around an axis (A) extending over the width of the outlet end ( 112 , 122 , 132 ) by the actuating drives ( 7 ), and when an increase of the inside diameter of the respective transverse section of the outlet end ( 112 , 122 , 132 ) occurs the corresponding transverse section of the central conduit ( 10 ) is narrowed, and vice versa, wherein the adjusting elements ( 6 ) have an adjusting lever ( 63 ) on an end facing away from the adjusting section ( 60 ), which can be connected with the actuating drive ( 7 ).