| 摘要 |
The present invention describes a device for centring a blown tubular film on a blown film extruder head, in which a die ring (20) from which the blown film emerges has assigned to it an outer cooling ring (24) which forms an annular gap consisting of two cooling-ring lips. Blown film extruders of this kind are used for extruding thin films, for example for the production of carrier bags or refuse sacks. It is attempted always to extrude the extruded film with the same wall thickness. Differences may be caused in this case, for example, during extrusion as a result of variable environmental effects, that is to say variable hall temperatures and the like. To be able to eliminate these influences, the invention provides that a cooling ring lip is formed by an adjustable outer cooling-ring disc (32), so that the gap width of the annular gap (38) between the cooling ring lips (34,36) can be varied by adjusting the outer cooling-ring disc. <IMAGE> |
