External guide for film tube in blown film line, has guide plates with guiding surfaces aligned with respect to longitudinal axis, where guiding surfaces have base with uprising raised to axis for swirling air stream to flow along film tube

摘要

The guide has guide plates (6, 7) with guiding surfaces aligned with respect to a longitudinal axis (4), where the guiding surfaces have a base with an uprising (8) raised to the axis for swirling the air stream to flow along a film tube (3). One of the plates comprises an angular sheet, and the guide is aligned for radial adjustment. The uprising includes spherical elevation, spherical recess, rack, bead form, circular form, semicircular form, polygon form and/or rhombus form. A blower blows air in a longitudinal direction between the tube and one of the guiding surfaces.