Cooling plug with improved vacuum channels

Details Cooling plug with improved vacuum channels Cooling plug with improved vacuum channels

B - Operations, Transporting

29

C

B29C 47/88 (2006.01) B29C 47/08 (2006.01)

Patent

CA 2567695

An improved cooling plug uses angled vacuum channels that meet at a number of upstream points to reduce forces exerted on the molten plastic as it passes over the cooling plug. In a preferred embodiment, the vacuum channels extend rearwardly and outwardly relative to the longitudinal axis of the cooling plug and the vacuum channels connect with a continuous vacuum header at a downstream position. The cooling plug uses a series of vacuum segments extending in the longitudinal direction of the cooling plug to provide a controlled vacuum source to a segment of the product being extruded. The vacuum channels are each of a short length relative to the length of the vacuum header.

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