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Home › Extrusion apparatus for tubular thermoplastic films including two (tandem) spaced air rings for controlling cooling rate and production speeds

Extrusion apparatus for tubular thermoplastic films including two (tandem) spaced air rings for controlling cooling rate and production speeds

US Patent 4834924 · Granted May 30, 1989

Estimated economic value: $4,996,000 ⓘ

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