| 摘要 |
The invention relates to a blown film die (10) for producing tubular film (3) consisting of thermoplastic plastic, comprising at least one supply channel for the plastic melt, which opens into an annular outlet nozzle and an interior and/or exterior cooling ring (1), which is adapted to the diameter of the extruded plastic tube (3) and is divided into sectors (30), in which the physical parameters of the air that is blown onto the extruded film tube (3) can be modified sector by sector. The blown film die (10) is subdivided into sections (31), in which the temperature can be respectively modified and/or in said blown film die, additional bores (6), which are aligned in a substantially perpendicular manner to the exterior cooling ring (1), are arranged around the periphery. Air, whose physical parameters can be modified, can be blown out of the bores and the blown film die is provided with at least one control unit (7, 8), which regulates or controls the different measures for influencing the film thickness. |
