Head for extrusion of elastomeric contour innerliner

Details Head for extrusion of elastomeric contour innerliner Head for extrusion of elastomeric contour innerliner

B - Operations, Transporting

29

C

18/742

B29C 47/68 (2006.01) B29C 47/02 (2006.01) B29C 47/08 (2006.01) B29C 47/14 (2006.01) B29C 47/70 (2006.01)

Patent

CA 2000504

ABSTRACT OF THE DISCLOSURE An extrusion head and method for forming a two-part laminated sheet from a single tubular-shaped extrudate stream emitted from the outlet of a single extruder. The stream flows into an enclosed chamber which diverges the stream in width and converges it in thickness. This stream is split by a wedge divider insert which extends across the outlet end of the chamber into multiple parallel, horizontal streams. Each stream then passes through a breaker plate or screen to remove any foreign particles present in the extrudate. A converging preform die in combination with a triangular preform insert converges the upper and lower streams into a single stream at a final die producing the unitary two-part laminate, preferably symmetrical about the horizontal plane. The extrudate preferably is a elastomer and the resulting laminated sheet is used as a tire innerliner. The combined two streams reduces the chance of a discontinuity in one stream lining up with a discontinuity in another stream thereby producing a laminate of high integrity. - 19 -

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