| 摘要 |
A method for producing rectangular-bottom bags comprising the following steps: initially making a flat bag (10) with bottom bellows (11); inserting the flat bag (10) onto a forming group (13) provided with means for widening out (15a, 15b) the bag (10) and making the widening means (15a, 15b) move apart so as to make the flat bag (10) take up a parallelepiped or cube shape; inserting bellows shaping means (16a, 16b) onto the bag (10), deformed according to the previous step, on side walls or outer sides (P) and a shaping wedge (17) onto the base, and at the same time making said widening means (15a, 15b) come together and inserting the wedge (17); withdrawing the shaping wedge (17) from the bag (10), once it has been flattened again and thus shaped; withdrawing the bag (20) formed by the means for widening (15a, 15b) the bag (10). It also foresees a device for carrying out the aforementioned method.
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