Production method of synthetic and yarn traverse device

Abstract

In the process of drawing/heat treating synthetic fiber thread melted and spun via a plurality of godet rollers and subsequently winding the same, accumulation of extraneous matter on the surface of the godet rollers may be prevented by performing multistage drawing/heat treatment while reciprocating the thread in the direction of the axis of rotation of the godet roller using the godet rollers at least two of which have surfaces having the roughness of 0.5≦Ra≦5 and one of which has a surface at a temperature of at least (melting point of synthetic fiber−70° C.), whereby occurrence of thread breakage or generation of fuzz may be prevented and synthetic fiber whereof the rate of operation can be increased and efficiency of manufacture is improved may be obtained.

What is claimed is:  
     
         1 . A method of manufacturing synthetic fiber comprising the steps of performing multistage drawing/heat treatment on the thread of synthetic fiber formed by melt spinning using a plurality of godet rollers, and subsequently winding the obtained thread, wherein at least two sets of godet rollers out of the plurality of godet rollers have surface roughness in the range of 0.5-5 μm, wherein at least one set of godet rollers out of these godet rollers having surface temperatures not less than (the melting point of the synthetic fiber−70° C.) is used, and wherein the thread is reciprocated in the direction of the axis of rotation of the godet roller.  
     
     
         2 . A method of manufacturing synthetic fiber according to  claim 1 , wherein the tensile stress of the thread is not less than 1. 4 cN/dtex in the last drawing step of the multistage drawing.  
     
     
         3 . A method of manufacturing synthetic fiber according to  claim 1  or  claim 2 , wherein the thread of the synthetic fiber is not less that 200 dtex.  
     
     
         4 . A method of manufacturing synthetic fiber comprising the steps of performing multistage drawing/heat treatment on the thread of synthetic fiber formed by melt spinning using a plurality of godet rollers, and subsequently winding the obtained thread, wherein the thread is reciprocated in the direction of the axis or rotation of the godet roller while synchronizing at least one thread converging guide for allowing the thread to pass through before and/or after the thread is wound around the godet roller which wind the thread first after passing the spinning duct and one or plurality of drawing operation aiding units disposed between the plurality of godet rollers.  
     
     
         5 . A method of manufacturing synthetic fiber according to  claim 4 , wherein the drawing process is a multistage drawing process including at least two stages.  
     
     
         6 . A method of manufacturing synthetic fiber according to any one of  claim 1  to Claim 5 , wherein the thread is multi-thread including at least two lines of thread.  
     
     
         7 . A method of manufacturing synthetic fiber according to any one of  claim 4  to  claim 6 , wherein the drawing operation aiding unit is a thread entangling device.  
     
     
         8 . A method of manufacturing synthetic fiber according to any one of  claim 1  to  claim 7 , wherein the width Y(mm)of reciprocating motion satisfies the following expression (1).  
         XF≦Y≦ 2( XP−XF )  (1)  
       where; 
 XF is the width of the thread (mm), and XP is the thread pitch (mm) between the adjacent threads.  
 
     
     
         9 . A method of manufacturing synthetic fiber according to any one of  claim 1  to  claim 8 , wherein the cycle of the reciprocating motion is at least 5 seconds.  
     
     
         10 . A thread traversing device to be used for a method of manufacturing synthetic fiber in which the thread of synthetic fiber formed by melt spinning is drawn/heat treated and then wound by a plurality of godet rollers, comprising at least one thread converging guide for allowing the thread to pass through before and/or after the thread is wound around the godet roller located immediately after the spinning duct, an drawing operation aiding unit disposed between a plurality of godet rollers, and means for synchronizing the thread converging guide and the drawing operation aiding unit.  
     
     
         11 . A thread traversing device according to  claim 10 , wherein the means for synchronizing the thread converging guide and the drawing operation aiding unit comprises a driving motor, a shaft mounted on the driving motor in the direction of the axis of rotation of the godet roller, and means mounted on the shaft and connected to both of the thread converging guide and the drawing operation aiding unit respectively for converting rotary motion into reciprocating motion, and the thread converging guide and the drawing operation aiding unit are respectively adapted to be reciprocated in the direction of the axis of rotation of the godet roller.  
     
     
         12 . A thread traversing device according to  claim 10 , wherein the means for synchronizing the thread converging guide and the drawing operation aiding unit comprises at least two driving motors, shaft respectively mounted on the respective driving motors in the direction of the axis of rotation of the godet roller, and means mounted on the respective shafts and connected to both of the thread converging guide and the drawing operation aiding unit respectively for converting rotary motion into reciprocating motion, and the thread converging guide and the drawing operation aiding unit are respectively adapted to be slid in the direction of the axis of rotation of the godet roller.  
     
     
         13 . A thread traversing device according to  claim 12 , wherein the means for synchronizing the thread converging guide and the drawing operation aiding unit comprises at least two phase detecting means for detecting that the shaft mounted on each driving motor rotates to the prescribed position, and adapted to stop the rotation of the shaft provided with the one of the phase detecting means when the prescribed position is detected by one of the phase detecting means, and to rotate the stopped shaft when the prescribed position is detected by the other one of the phase detecting means.  
     
     
         14 . A thread traversing device according to any one of  claim 10  to  claim 13 , wherein a speed reducer is provided between the shaft and the driving motor.  
     
     
         15 . A thread traversing device according to any one of  claim 10  to  claim 14 , wherein the cycle of the reciprocating motion of the thread converging guide and the drawing operation aiding unit is not less than 5 seconds.  
     
     
         16 . A thread traversing device according to any one of  claim 10  to  claim 15 , wherein the thread converging guide and the drawing operation aiding unit are adopted to be used for the tread including a plurality of lines of thread.  
     
     
         17 . A thread traversing device according to any one of  claim 10  to  claim 16 , wherein the drawing operation aiding unit is a thread entangling device.