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Process for cooling a tubular sheath obtained by blowing the hot extrusao - a material termoplastico, device for its achievement practice and their use
Process for cooling a tubular sheath obtained by blowing the hot extrusao - a material termoplastico, device for its achievement practice and their use
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机译:吹制热挤出物制成的管状护套的冷却方法-一种热塑性塑料,其实现实践的装置及其用途
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摘要
Process and device for cooling a tubular sleeve produced by hot extrusion-blowing of a thermoplastic material through an annular die. In the process, a stream of primary air is flowed under pressure substantially parallel to and spaced from the tubular sleeve and reaches the tubular sleeve at a second stage. The stream of primary air induces a stream of secondary air which flows substantially parallel and proximate to the tubular sleeve at a first stage and whose flow is substantially laminar over most of its path. The device includes a first cylindrical sleeve member that, in combination with the tubular sleeve, defines a secondary air flow space. A second cyclindrical sleeve member and the first sleeve member define a primary air flow space therebetween. A cylindrical ring disposed proximate to the annular die directs air into the secondary air flow space. A source of pressurized air is in flow communication with the primary air flow space.
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