| 摘要 |
<p>Apparatus for wrapping an article in a stretchable polymeric film comprises a pair of stretch rollers (208, 212) for stretching the film, a film dispenser (200) for delivering the film (204) to the stretch rollers (208, 212) and means for rotating the article (214) to take up stretched film from the stretch rollers. The means for rotating the article (214) comprises a first hydraulic motor (12) and the stretch rollers (208, 212) are driven by a second hydraulic motor (14) connected in series to the first motor, the first motor (12) being run on the exhaust (or part of it) from the second motor (14), whereby the ratio of the outputs of the first and second motors is fixed. One of the pair of stretch rollers (208) constitutes one of two nipped rollers (206, 208), the nipped roller (208) being directly driven by the second motor (14) and geared to the other nipped roller to drive it at the same peripheral velocity. The nipped roller (208) is coupled to the other stretch roller (212) to drive the latter at up to 160 % higher peripheral velocity than the roller (208). The apparatus may be used for wrapping bales of silage.</p> |
