| 摘要 |
1278549 Laminated tubular films REIFENHAUSER KG 30 Sept 1970 [31 Oct 1969] 46392/70 Headings B5A B5B and B5N Laminated tubular synthetic plastics film 3 is produced by extrusion from a blowing head comprising two concentric and axially spaced nozzles 5, 6, each having a separate blowing means 9 for the extruded film, whereby the degree of stretch and/or cooling imparted to each film may be individually controlled before the films are united. The films may be of the same or different polymers, and included in the blowing medium may be an agent promoting or preventing adhesion. Adhesion may also be promoted electrostatically. The axial spacing of the nozzles may be variable.
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