| 摘要 |
<p>An equipment to package rectangular bags with rigid corners, including a forming rectangular tube R provided with four small fins (1, 2, 3, 4) that are parallel and prominent laterally along the prolongation of the two parallel sides of the forming tube R. Said fins, together with two longitudinal side contrasts (L) located parallel to the two other sides of the forming tube (R), create on the film F four prominent longitudinal folds (11, 12, 13, 14), which remain even when the four short fins (1, 2, 3, 4) end to allow the intervention of four thermosealing devices (21, 22, 23, 24). Said thermosealing devices (21, 22, 23, 24), in cooperation with the side contrasts L, perform the thermosealing operations of the prominent longitudinal folds of the film F, which is wrapped around the rectangular tube R, thus realizing the stiffening of the four corners S of the bag resulting from the packaging process of the film F. The equipment is constructed for an automatic positioning of four thermosealing devices at each change of format.</p> |
