| 摘要 |
A forming roller or a supporting roller arrangement (10) for a packaging material web (30) used for a liquid container comprises a plurality of rollers (11) with the outer peripheral surface thereof curved in the axial direction of a shaft (13) of each roller (11). The plurality of rollers (11) are arranged at positions for forming a planar packaging material web (30) into a tubular shape or at positions for supporting the packaging material web after it has been formed into a tubular shape. Each roller (11) is divided into a plurality of roller portions (115,117,119) along planes perpendicular to the roller shaft (13). The packaging material web (30) is passed between the plurality of rollers (11), and the surface of the packaging material web is brought into contact with outer peripheral surfaces (111) of said plurality of rollers. When said packaging material web (30) is transported, each of the divided roller portions (115,117,119) of the rollers (11) is independently rotated. In this case, the roller portion (117) having a smaller diameter is more quickly rotated than the roller portion (115,119) with a larger diameter, and there will be no big difference in peripheral speed between the outer peripheral surfaces (111) of the rollers (11). As a result, the resistance presented by the rollers to the packaging material web (30) is reduced, and the packaging material web is fed more smoothly. <IMAGE> |
