Winding shaft

Abstract

The invention relates to a shaft axle for winding up a material web, particularly plastic films, namely particularly stretch films. In order to provide a shaft axle with a strength and stiffness as high as possible, a shaft axle is provided showing a shaft body, which is made largely from fiber-reinforced plastic to yield bending stiffness as high as possible, and cavities, provided along the exterior perimeter of the shaft body, with the cavities being limited in the radial interior direction by a layer of fiber-reinforced plastic and allowing tension bars to expand from the cavities radially towards the outside.

1 . A shaft axle for winding up a material web,
 comprising a shaft body, which is made largely from fiber-reinforced plastic in order to achieve bending as high as possible, and   comprising cavities, which are provided along the exterior perimeter of the shaft body, with the cavities being limited in the radial interior direction by a layer of fiber-reinforced plastic, and allowing tension bars to expand out of the cavities in the radial exterior direction.   
     
     
         2 . A shaft axle according to  claim 1 , with the fiber-reinforced plastic comprising aligned continuous fibers, which are connected via cured resin. 
     
     
         3 . A shaft axle according to  claim 1 , with the aligned continuous fibers being made from carbon fibers. 
     
     
         4 . A shaft axle according to  claim 1 , with the tension bars showing cup-shaped elements at their radial end, made from plastic and/or a fiber-reinforced composite material. 
     
     
         5 . A method for producing a shaft axle according to  claim 1 ,
 with formed bodies being provided to accept tension bars that can expand radially and continuous fibers being layered around them, with the formed bodies in the radial interior direction resting at least on one layer with aligned continuous fibers,   in which the formed bodies are connected to the continuous fibers is the cured resin, and   in which after the resin has cured the radially expandable tension bars can be inserted into the formed bodies.   
     
     
         6 . A method for producing a shaft axle according to  claim 1 ,
 in which a shaft body is produced largely from a fiber-reinforced plastic to yield bending stiffness as high as possible,   in which cavities are cut into the shaft body along the perimeter, with the cavities in the radial interior direction being limited by a layer of fiber-reinforced plastic, and   in which the tension bars that can radially expand being inserted into the cavities.   
     
     
         7 . A winding device for winding up a material web,
 comprising a shaft axle according to  claim 1 ,   showing a bearing arrangement arranged at least at one side of the shaft axle, in which the respective end of the shaft axle rests with two sections distanced from each other.   
     
     
         8 . A winding device according to  claim 7 , comprising bearing arrangements located at both sides of the shaft axle, with the ends of the shaft axle being supported therein, with each of the two bearing arrangements supporting the corresponding end of the shaft axle in two sections distanced from each other. 
     
     
         9 . A winding device according to  claim 7 , comprising at least one winding core encompassing the shaft axle, which can be fixed in reference to the shaft axle via tension bars that can expand.