Biaxial film stretching equipment for a thermoforming machine has two conveyer belts, the second moving faster than the first and also moving apart perpendicular to the film

摘要

A film strip is stretched and heated in the longitudinal direction by two endless conveyer belts, one behind the other with a gap between them. Each conveyer has either needles, claws or prongs for gripping the film. The second conveyer belt (8) moves at higher speed than the first belt (5). In a following thermoforming operation both parts of the second conveyer move apart causing the film (2) to stretch in the transverse direction.