Patent ID: 9463590
Filing Date: 2016-10-11
CPC Classification: B29C,B29K,B29L,Y10T

Claim Text:
1. A method for producing a plastic foil tube with an intended cross-section that derives from a circular cross-section, comprising the following method steps: mounting a semi-finished tube on a core tool such that the core tool extends longitudinally within the semi-finished tube; charging the mounted semi-finished tube with a predetermined force, wherein said predetermined force is applied and acts in a direction transverse to a longitudinal direction of the semi-finished tube to press the semi-finished tube into one or more recesses of a core cross-section of the core tool within the semi-finished tube, whereby elongate crinkles are formed in the semi-finished tube which extend in said longitudinal direction; heating the semi-finished tube to a predetermined forming temperature for a predetermined time period for the production of the plastic foil tube with the intended cross-section; and stripping the plastic foil tube formed in such a manner off the core tool after the plastic foil tube has cooled down.