Classification method of bobbins according to rigidity of yarn package and apparatus for determining yarn package air-permeability

摘要

BACKGROUND OF THE INVENTION The present invention relates to a method for sorting yarn spools according to the rigidity of a yarn winding (41) embedded in a dyeing tube (42). The coils (4) are classified into groups according to the winding permeability (41). The invention also relates to a device for detecting the breathability of a yarn winding (41) which is supported on a tube (42) provided with a plurality of through-radial openings (421), the ends (43, 44) of the tube (42) being closed and the inner space of the tube (42 ) is connected to a source (1) of compressed air, wherein a flow meter (2) is included in the supply line to the inner space of the tube (42) and a pressure gauge (3) is connected to the outlet line of the compressed air source (1).