| 摘要 |
To control melt thickness, selected regions over the width of the wide slot nozzle (1) exit region (5), are temperature-controlled. One or more lip components (6) are temperature-controlled. In specified regions, the emerging melt thickness can be varied under control, during operation. One or more regions of the nozzle are subjected to differing temperature control. The temperature is influenced and especially heating takes place, directly at the outlet (5) in one and/or another lip component, which are individually or locally controlled over the entire width. Temperature control is applied on one or both sides of the lip component, using suitable (e.g. cartridge-) heaters (9). Control is applied individually or to segments over the entire width of the nozzle. Lip geometry matches the space between smoothing rollers, allowing the outlet region to be located near the roller nip. The wide slot nozzle and especially its lips, starting from the outlet opening (4) are temperature-controlled over the entire width in a heating zone of up to about 100-150 mm wide. The equipment also includes equipment measuring the melt thickness and/or bulge continuously. This measurement takes place before entry of the melt into the smoothing rollers, or exit from them, and facilitates selective temperature control. An independent claim IS INCLUDED FOR corresponding equipment. |
