Filament melt spinning assembly, has an air guide system within the cooling tube to deflect cooling air flows away from the wall of the cooling tube to give a short cooling path for high speed filaments

摘要

The melt spinning assembly, to spin filaments, has at least one guide (11) within the cooling tube (7), between the entry (10) and the exit (13). The guide (11) deflects the cooling air edge streams at the wall (12) of the cooling tube (7). The guide can be a segment, at the side of the cooling tube (7), to deflect the cooling air edge streams from the wall (12) of the cooling tube (7), where it is covered by the segment. A number of segments are at the tube wall (12), at intervals, on the peripheral line of the tube (7) and in the direction of filament travel through the cooling tube (7). The guide (11) is a ring body (11), which gives a cross section reduction (14) within the cooling tube (7), so that the cooling edge air streams are wholly deflected away from the cooling tube periphery, and a number of ring bodies can be fitted at intervals. The air streams deflected by the guide have different values, which increase or decrease in the direction of filament travel. The ring body (11) has a structure which gives an uneven increase in the flow cross section directly after it, in the direction of filament travel. The ring body (11) is mounted at the cooling tube (7) with an axially adjusted position. The guide can be formed by distorting the shape of the cooling tube wall (12) into a beading, over at least a part of the tube length, and in a number of positions. An entry cylinder (5) for the filaments is between the spinneret (2) and the cooling tube (7), with a gas-permeable wall (9). A guide funnel (6) is at the transit between the cylinder (5) and the tube (7). The cooling tube (7) has a smaller diameter than the diameter of the entry cylinder (5). At the outlet end of the cooling tube (7), its cross section expands steadily so that the tube diameter at the entry (10) is smaller than the diameter of the outlet (13). The air flow is generated by an under pressure source (18), linked to the exit end of the cooling tube (7), to extract cooling air by suction from the entry cylinder (5) and the cooling tube (7). The air flow can also be generated by a fan, at the entry end of the cooling tube (7), to blow cooling air into the entry cylinder (5) and the cooling tube (7). A heater applies a thermal action on the filaments between the spinneret and the entry cylinder.