| 摘要 |
The invention relates to a method for the production of films in the thickne ss range of 20 m 1,000 m from thermoplastic plastics by extrusion of the plasti c through a broad slot nozzle (4) and polishing of the melt film (5), escaping from the broad slot nozzle in a polishing unit, comprising at least three or four rollers (1, 2, 3), whereby a first roller pair (1, 2) forms a polishing gap for holding the melt film and the melt film is then run behind said polishing unit gap through a subsequent polishing gap or a subsequent pressi ng gap. The above is characterised in that the ratio of the width of the nozzle gap and the film thickness lies on the range 1: 1 to 6: 1 and the quotient o f the film web speed in the subsequent polishing gap or the subsequent pressin g gap divided by the film web speed in the polishing gap formed by the roller pair (1, 2) lies in the range 0.8 to 1.05. |
