Air cooling ring for blown plastics film

Details Air cooling ring for blown plastics film Air cooling ring for blown plastics film

B - Operations, Transporting

29

C

B29C 49/64 (2006.01) B29C 47/88 (2006.01)

Patent

CA 2228306

An air ring, for supplying successive streams of cooling air to the exterior surface of a tubular bubble of plastic after its extrusion from an annular die, has a primary annular air outlet arranged to be located around and closely adjacent the die, and a secondary annular air outlet located axially downstream of the primary annular air outlet in the direction of travel of the tubular bubble. The primary annular air outlet is formed between an inner lip and an adjacent edge of an intermediate lip, and the secondary annular air outlet is formed between an outer lip and an adjacent edge of the intermediate lip. The lower lip, intermediate lip, and the outer lip are arranged to diverge from the die so as to allow the tubular bubble to expand co-axially with the die at an angle of divergence of at least 40~, and preferably at least 50 or 60~, without interfering with any of the lips.

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