| 摘要 |
Apparatus for transversely stretching a travelling web of flexible plastic sheet material consists of a pair of opposed pressure elements (10; 50cm diam. disk, 11; pressure plate) which cause the web to take up an extended path from margin to margin by applying opposed forces respectively to the opposite surface of the web at alternate spaced locations across the width of the web so as to cause the web to stretch transversely, and edge-restraining means (17;pin) for gripping the longitudinal margins of the web to prevent substantial laternal inward movement of the web margins.
|
