Verfahren und Vorrichtung zum Querstrecken oder biaxialen Recken einer Folie, geeignet zum Einwickeln einer Ladung

Stretch wrapping packaging material on a load includes introducing stretch wrap packaging material (154) onto V shaped tips (110) of projecting portions (104) of a first grooved roller (102) so that the packaging material (154) spans the nonprojecting portions (106) of the first grooved roller (102). The web of packaging material (154) and the first grooved roller (102) are transported in the direction generally parallel to the grooves. The web of packaging material (154) spanning the nonprojecting portions (106) of the first grooved roller (102) is impinged with V shaped tips (210) of projecting portions (204) of a second grooved roller (202). The tips (210) of the projecting portions (204) of the second grooved roller (202) are transported at a speed which is less than the speed of the tips (110) of the projecting portions (104) of the first grooved roller (102). The tips (210) of the projecting portions (204) of the second grooved roller (202) moves at a speed which stretches the web (154) between the first and second grooved surfaces in a direction transverse to the direction in which it is transported and minimizes any stretching of the web in the direction in which the web is transported. The web is stretched between the projecting portions of the first and second grooved rollers (102,202) in a direction transverse to the direction in which the web is transported. The web is separated from the first and second grooved surfaces and wrapped onto a load (101) by providing relative rotation between the load and a dispensing mechanism (100) for the web.