B - Operations – Transporting – 29 – C
Patent
B - Operations, Transporting
29
C
B29C 47/88 (2006.01) B29C 47/12 (2006.01) B29D 23/00 (2006.01)
Patent
CA 2315463
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 cooling air outlet arranged to be located around and closely adjacent the die orifice, and a secondary annular cooling 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 coaxially with the die at an angle of divergence of at least 60 degrees from the die axis without interfering with any of the lips. Air ring means is also provided for ease of adjustment of cooling air flow rate from the primary cooling outlet. Better control of the product is therefore made possible while permitting tubular bubble expansion with an angle of divergence of up to 60 degrees or more. Apparatus is also included to remove contaminants from a tubular bubble immediately after its extrusion.
Borden Ladner Gervais Llp
Krycki Robert D.
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