Head for extrusion of elastomeric contour innerliner

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

1988-12-22

1990-01-09

Chiesa, Richard L.

Plastic article or earthenware shaping or treating: apparatus

With upstream screen or perforated plate for straining,...

264171, 2641761, 425199, 4253824, 425462, B29C 4768

Patent

active

048924733

ABSTRACT:
An extrusion head for forming a two-part laminated sheet from a single tubular-shaped extrudate stream emitted from the outlet of a single extruder. The stream flow 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 an 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.

REFERENCES:
patent: 3941544 (1976-03-01), Barth
patent: 3959431 (1976-05-01), Nissel
patent: 3985654 (1976-10-01), Pall
patent: 4017240 (1977-04-01), Nelson
patent: 4087222 (1978-05-01), Noel
patent: 4113411 (1978-09-01), Terragni
patent: 4167384 (1979-09-01), Shirato et al.
patent: 4323339 (1982-04-01), De Kok et al.
patent: 4619802 (1986-10-01), Cloeren
patent: 4690628 (1987-09-01), De Hennau et al.

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