| 摘要 |
A description is given of a plant for the production of a multi-layer heat shrinkable polymeric film, based on the twin-bubble co-extrusion technique, said plant differing from those already known as to a new multi-layer extrusion die and as to the modifications to and improvements in the steps of: tubular film thickness adjustment and cooling (3, 4); cooled tubular film after-heating (62, 63); film final cooling (10) which, together with a new extrusion die, improve the plant output and the quality of the film produced thereby. |
