Assembly for welding by means of ultrasound, method and apparatus for forming filled pockets, and pockets produced by implementing them

摘要

The invention relates to the manufacture of pockets for packaging liquids. It relates to a method in which pockets are manufactured, which pockets include a longitudinal weld (12) forming a tube, end welds (13, 14) delimiting the pocket, and a weld (17) intended to form a pouring spout. According to the invention, all the welds are formed by ultrasound. Moreover, the welds of the ends (13, 14) and of the pouring spout (17) are formed in two stages, a first stage in which the weld is formed and a following stage of application of a greater pressure in which the cutout is produced. Application to the manufacture of pockets for filling with liquid products. IMAGE