| 摘要 |
<p>The invention relates to a method and device for strengthening the cylindrical item, especially, for strengthening a paper roll. According to the invention an essentially tube shaped bag closed on its both ends (2a, 2b) and equipped with an inflation valve (3) is placed into the cylindrical item in order to press the outer surface of the bag (1) against the inner surface of the cylindrical item.</p> |
