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Process for the manufacturing of a mechanically conditioned thermoplastic film with biaxially recoverable stresses
Process for the manufacturing of a mechanically conditioned thermoplastic film with biaxially recoverable stresses
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机译:具有双轴可恢复应力的机械调节热塑性薄膜的制造方法
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摘要
A process of expanding plastics film is disclosed, together with an apparatus for performing that process, in which expansion of the plastics film is performed under the control of a liquid providing a stable hydraulic mass, by the downward extrusion and drawing of the plastics film, and the final expansion thereof, exclusively under the influence of the static and dynamic pressure of a hydraulic mass, at a position spaced downwardly of the extrusion head, the hydraulic mass being one that remains in a liquid phase at all temperatures encountered during the step of lateral stretching of the plastics film, to the exclusion of vaporization of the hydraulic mass.
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