Method and apparatus for returning a buckling in the case of a film web which have become beulig by erwärmumg

摘要

A method for recycling one occurring in the case of a buckling by heating, which have become beulig film web (3), comprising the steps of:– Providing the film web (3),– Heating of the film web (3),– Stretching of the film web (3) in the direction of conveyance and– Stretching of the film web (3) transversely to the conveying direction,the stretching of the film web (3) in the conveying direction by means of two sequential conveyor means (41, 43) is effected, whereby the second conveyor device in the conveying direction (43) with a higher speed than the in the direction of conveyance first conveying device (41) is driven, and wherein the difference in speed is preferably 2 to 4%,the stretching of the film web (3) transversely to the conveying direction, by lateral guides (431, 432) of the second conveying device (43) for the film web (3) takes place, the for stretching the film web (3) transversely with respect to the conveying direction are moved away from one another, andthe two conveying means (41, 43) are driven intermittently.