| 摘要 |
<p>A stenter system (1) comprises a preliminary stenter (2A) providing extrusion speed hold-back of film and, downline therefrom, a main stenter (2B) which includes an initial substantially parallel section (5) in which machine-direction stretching of the film takes place followed by a diverging section (D) where transverse stretching of the film occurs. A preferred film clip for use in this stenter system comprises a film holding/gripping element in the form of a plate (8) or a roller (19) and a clip body (6) for supporting the holding element (8, 19) which clip body can form part of a clip chain. The holding element (8, 19) is carried by the body (6) such that it can swing in a plane parallel to the machine direction into and from a film holding/gripping position, and the element is swung by means of an eccentric drive (9, 11, 13) actuated for example by cam surfaces (17, 18). On film gripping, the holding element (8, 19) can have a self-generating gripping action imparted thereon by the longitudinal film drawing force (P).</p> |
