| 摘要 |
<p>A method for wrapping loads with a pre~stretched extensible plastic film (F) by means of a pair of pre-stretcliitig cylinders (2,3) after which the film is being wrapped continuously around a load (100) to make a package of the same. The method according to the invention consists of the following phases: a) apply a special pre-stretching elongation to the portion of film (F) comprised between said pair of pre-stretching cylinders (2,3); b) wrap the pre-stretched film around the load with the "normal1" method ; c) monitor continuously the condition of the portion of film (F) subject to pre-stretching; d) stop applying said pre-stretching as soon as it is found that the film (F) stalls to break; e) continue wrapping the film (F) around the load (100) with a temporary method preventing the film from breaking completely; f) after the portion of film (F) that started to break has completely overcome the pair of cylinders (2.3). apply the pre-stretching again to the portion of film (F) comprised between said pair of cylinders (2,3); and, g) after the portion of film that started to break is sufficiently fastened to the stack, continue wrapping the film around the load with the "normal" method.</p> |
