| 摘要 |
1338640 Blowhead for tubular film WINDMOLLER & HOLSCHER 10 June 1971 [30 June 1970] 19975/71 Headings B5B and B5A In a blowhead for tubular film, wherein cooling and inflating air is introduced axially via pipe 19 into the bubble 6 and is removed under suction down a pipe 14 inside and coaxial with the inlet pipe, a guide ring 17 is positioned at the end of tube 14 to deflect the air directly against the film and at least one further guide ring or rings 17<SP>1</SP>, 1711 are provided disposed around an extension 26 of tube 14, each ring having an aperture 33, 34 adjacent the extension 26. All the rings may be of equal diameter, the said further rings having apertures of increasing size in the downstream direction, and being adjustably mounted. The aperture may be annular, and defined by the tube 26 and the inner diameter of the ring(s). A tubular deflector 35 may separate the air streams flowing through the apertures in adjacent rings. Pipe 29 may be provided, which dips into the end of tube 26 and acts to cool the remote end of the bubble by drawing air in under ejector action from the air flow through pipe 14. Alternatively, the pipe 29 may extend into a supply line for cooling air. The ring 10 supplies external cooling air. |
