ES362387A1 - Procedure and apparatus for the production of a oriented organic polymer film. (Machine-translation by Google Translate, not legally binding)
- Google Patents
Procedure and apparatus for the production of a oriented organic polymer film. (Machine-translation by Google Translate, not legally binding)
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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WR Grace and Co
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WR Grace and Co
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Priority to ES362387ApriorityCriticalpatent/ES362387A1/en
Publication of ES362387A1publicationCriticalpatent/ES362387A1/en
Shaping By String And By Release Of Stress In Plastics And The Like
(AREA)
Abstract
Process for the production of an oriented film of an organic polymer, particularly a vinyl chloride polymer, which comprises extruding the polymer into a melt through an annular extrusion hole in order to form a tubular film, and expanding the film tubular by means of internal gaseous pressure at a temperature between the melting temperature and the solidification temperature, characterized in that the film expands under conditions such that the film is oriented predominantly in the transverse direction; and after said expansion the oriented film is cooled to below the solidification temperature and subsequently reheated and longitudinally oriented by stretching. (Machine-translation by Google Translate, not legally binding)
ES362387A1969-01-111969-01-11Procedure and apparatus for the production of a oriented organic polymer film. (Machine-translation by Google Translate, not legally binding)
ExpiredES362387A1
(en)
A method and apparatus for forming an internal annular groove or slope on a pipeline length. (Machine-translation by Google Translate, not legally binding)