| 摘要 |
<p>The apparatus comprises a flat extrusion head (10), a rotating cooling roller (11), a blowing means (12) that directs an adjustable amount of air onto the film (P), while said film (P) is spread on the cooled rotating roller (11), the blowing means (12) consisting of a slit (17) formed between two opposite lips (14, 15). Preferably one lip (14) is fixed and the other (15) is movable and comprises means for adjusting the slit (17). Use of a sucking means (13) positioned opposite the blowing means (12) with respect to the film (P) is also envisaged.</p> |
