The present invention relates to a method and apparatus for the take-up of continuous filament bundles of synthetic fibers at a high speed. More particularly, it relates to a method for the take-up of continuous filament bundles of synthetic fibers, such as yarns and tows, or the like at a high speed, comprising introducing the continuous filament bundles carried on the air stream into a bent tube provided downstream of the air jetting device, which is rotating in substantially reverse direction to that of the continuous filament bundles discharged from the outlet of the bent tube at a peripheral speed of the outlet thereof being 0.5 to 2.0 times the take-up speed of the continuous filament bundles, and receiving the continuous filament bundles into a receiving device, and an apparatus therefor.
Hitherto, the take-up of a number of yarns (e.g. tow) has been carried out by using a pair of gear rollers or a pair of belts, between which the tow is put and taken up. With the speed up in the treatment of the tow for improving the productivity and for rationalizing the procedure, it is required to take up the tow at a higher speed. For instance, when the tow is taken up at a high speed of 2,000 m/min. or more, the conventional methods using gear rollers or belts have a defect that the tow is wound around the final take-up rollers due to the accompanying air stream. For eliminating the defect, it has been proposed to provide an air jetting device in the high speed take-up method. However, when the tow discharged from the air jetting device is directly received into the tow receiving device, the received tow is disturbed by the air stream jetted out together with the tow, and thereby, when the tow is drawn out from the receiving device in the subsequent step, the tow becomes entangled and can not stably be drawn out. There has also been proposed a method comprising striking the tow discharged from the air jetting device onto a lattice or net drum, by which the tow is separated from the air stream, and then the tow is taken up. However, according to this method, when the tow is struck, it is somewhat crimped and entangled, and therefore, when the tow is drawn out from the receiving device in the subsequent step, the tow can not stably be drawn out because it has become snarled.
Under the circumstances, the present inventors have intensively attempted to eliminate these defects in the conventional methods for taking up the continuous filament bundles. As the results, it has been found that the object can be accomplished by using a bent tube which is rotating in a substantially reverse direction to that of the continuous filament bundles discharged from the outlet of the bent tube at a fixed speed.
An object of the present invention is to provide an improved take-up method of the continuous filament bundles of synthetic fibers at a high speed.
Another object of the invention is to provide an apparatus useful for the take-up of the continuous filament bundles of synthetic fibers at a high speed.
These and other objects will be apparent from the following description.
The take-up method of the continuous filament bundles of synthetic fibers (hereinafter, referred to merely as "yarns") of the present invention comprises introducing the yarns discharged from the air jetting device and carried on the air stream into a bent tube provided downstream from the air jetting device, which is rotating in substantially reverse direction to that of the yarns discharged from the outlet of the bent tube at a peripheral speed of the outlet thereof being 0.5 to 2.0 times the take-up speed of the yarns, and receiving the yarns into the receiving device provided downstream from the bent tube.
The apparatus useful for the take-up of yarns at a high speed according to the present invention comprises an air jetting device provided downstream from the final take-up rollers, a bent tube provided downstream from the air jetting device, and a receiving device provided downstream from the bent tube.
According to the present invention, the winding of the yarns onto the final take-up rollers can be prevented by using the air jetting device, and further, by introducing the yarns discharged from the air jetting device into the bent tube together with the jetting air stream and moving the tip of the bent tube circularly in substantially a reverse direction to that of the stream of the yarns and the air, at a speed approximately equal to the take-up speed of the yarns, the yarns and the jetting air are discharged from the outlet of the bent tube at an absolute speed of approximately zero. Therefore the yarns are stably, without any disturbance, disposed into the receiving device.