| 摘要 |
A forming roller or a supporting roller for a packaging material web used for a liquid container according to the present invention comprises a plurality of rollers with outer peripheral surface thereof curved in axial direction of a rotating shaft, and said plurality of rollers are arranged at positions for forming a planar packaging material web into tubular shape or at positions for supporting the packaging material web after it has been formed into tubular shape. Each roller is divided into a plurality of roller portions by planes perpendicular to a rotating shaft thereof. The packaging material web is passed between said plurality of rollers, and the surface of the packaging material web is brought into contact with outer peripheral surface of said plurality of rollers. When said packaging material web is transported, each of the divided roller portions of the rollers is independently rotated. In this case, the roller portion having a smaller diameter is more quickly rotated than the roller portion with a larger diameter, and there will be no big difference in peripheral speed between the outer peripheral surfaces of the rollers. As a result, resistance of the rollers to the packaging material web is reduced, and the packaging material web is passed more smoothly.
|
