Increased cooling capacity when using a flexible air guiding system due to the Venturi effect in blown film extrusion
A flexible air guiding system in blown film extrusion enables a mass throughput increase of more than 60 %. The development encloses the bubble expansion zone and creates a flow gap between the film bubble and a flexible membrane. In this gap, the flow velocity of the cooling air can be increased, resulting in higher heat extraction. As a side effect, the increase in flow velocity creates a local vacuum in the gap, causing the film bubble to open earlier than in the conventional process. Because of this surface enlargement the heat extraction can be improved again. During the extrusion process, the flow gap can be adjusted to the current bubble geometry independent of the process parameters.
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