| 摘要 |
<p>The gp. of transverse drawing rollers are situated as close as possible to the extrusion outlet for the tubular film without destroying the compressed air bubble, in order to utilise the heat in the plastics material reached during extrusion, which serves to bring about the self-sealing action between juxtaposed films. These remain joined at the edges forming a single body when the pressure and drawing roller gp. applies appropriate pressure. (0/1)</p> |
