Patents Assigned to Unifos Kemi AB
  • Process for blowing film from linear thermoplastic material
    Patent number: 4511530
    Abstract: A process at continuous blowing of film such linear thermoplastic materials which after that the plastic melt has left an annular die, when introducing gas to the inner of the tube, forms a neck part having an essentially constant diameter and then forms a rapidly expanding main bubble whereby the speed of the film at the upper part of the neck is kept above 15 m/min.
    Type: Grant
    Filed: October 13, 1983
    Date of Patent: April 16, 1985
    Assignee: Unifos Kemi AB
    Inventors: Stefan Olsson, Ralph Widenback