FREMGANGSMAATE TIL OPPNAAELSE AV EN FOLD PAA EN PLATE ELLER EN HUL GJENSTAND AV PLASTMATERIALE, SLIK SOM EN TUBE.

摘要

The invention has for its object a process for obtaining a fold on a sheet or a tubular part (1) in plastic material of thickness 0,25 to 0,8 mm, characterized in that it is rolled at least one bent portion of said sheet or a longitudinal portion of said tubular piece between the rollers (2, 3) for tightening the said portion so as to obtain a laminated sheet having at its top a striction of the depth of between 2% and 15% of the said thickness, this fold being then resiliently hinged. & br / it is in particular of the blank of the flexible skirt of a tube, and of the tube obtained. (br / the invention applies to the flexible tubes conditioning of the various products, the pressed of these tubes and their times of being improved.