| 摘要 |
<p>The method involves folding the paper sheet containing the paper blank and applying paper glue at appropriate parts of the paper to form a partial tube. The partial tube is then passed between groups of creasing wheels which form the side gussets (14a,b). Each gusset forms two rough folds (22a-22d) and are secured by paper glue to the base part (28) of the bag so as to avoid the formation of internal recesses.</p> |
