| 摘要 |
1090-4 APPARATUS FOR CONTROLLING THE FLOW OF AIR FOR EXTERNAL COOLING IN AN EXTRUDER FOR MAKING TUBULAR FILM An apparatus is provided for controlling the flow of air for external cooling in an extruder for extruding a tubular film from an extruder head. To ensure that the flow of the air for external cooling to the point at which the tubular film begins to expand can be controlled, regardless of the distance from that point to the extruder head, flaps are evenly distributed around the tubular film, and are displaceable along the tubular film. |
