For conventional high-speed mass production of flexible tubes, the skirt of the tube must be obtained directly by extrusion with a thickness at least six times lower, under conditions so that it is difficult or even impossible, to control the action of the blowing agent in the screw, then in the convergent zone of the extruder, so that a skirt is obtained with a expanded extruded layer with significant irregularities in thickness, which does not make it possible to provide an acceptable industrial packaging.
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