Method and device for removing defects on a stationary web of a packaging material

Abstract

The invention relates to a method for removing defects on a stationary web of a packaging material (106), comprising moving said web of packaging material (106) through a repair line from a first rotatable roller (121) to a second rotatable roller (122) in a first direction, cutting off said web of packaging material (106) at a first predetermined position, guiding said web of packaging material (106) of said first roller (121) into a second direction, wasting said web of packaging material (106) of said first roller (121) by movement in said second direction to a waste station, cutting off said web of packaging material (106) of said first roller (121) at a second predetermined position, guiding said web of packaging material (106) of said first roller (121) back into said first direction, splicing said web of packaging material (106) of said first roller (121) back together with said web of packaging material (106) of said second roller (122) at said first predetermined position, wherein said method is automated. The invention further relates to a device for removing defects on a stationary web of a packaging material.

1 . A method for removing defects on a stationary web of a packaging material, comprising;
 moving said web of packaging material through a repair line from a first rotatable roller to a second rotatable roller in a first direction,   cutting off said web of packaging material at a first predetermined position,   guiding said web of packaging material of said first roller into a second direction,   wasting said web of packaging material of said first roller by movement in said second direction to a waste station,   cutting off said web of packaging material of said first roller at a second predetermined position,   guiding said web of packaging material of said first roller back into said first direction,   splicing said web of packaging material of said first roller back together with said web of packaging material of said second roller at said first predetermined position,   wherein said method is performed under control of a controller.   
     
     
         2 . The method of  claim 1 , wherein guiding the web of packaging material into a second position is performed by changing the position of a guiding cylinder, and wherein guiding the web of packaging material back into the first direction is performed by returning the guiding cylinder to its initial position. 
     
     
         3 . The method of  claim 1 , further comprising the step of stopping said web of packaging material from moving in said first direction before the step of cutting off said web of packaging material at said first predetermined position. 
     
     
         4 . The method of  claim 1 , further comprising the step of stopping said web of packaging material from moving in said second direction before the step of cutting off said web of packaging material at said second predetermined position. 
     
     
         5 . The method according to  claim 1 , further comprising the step of rewinding said web of packaging material of said second roller from said second roller onto a third rotatable roller. 
     
     
         6 . The method according to  claim 1 , further comprising, as a first step, the step of receiving information regarding said defects of said web of packaging material from a control unit. 
     
     
         7 . The method according to  claim 1 , further comprising the step of controlling the tension of said web of packaging material in a longitudinal direction of said web of packaging material by means of a tension control device. 
     
     
         8 . A device for removing defects on a stationary web of a packaging material, comprising:
 a first rotatable roller and a second rotatable roller configured to wind said web of packaging material being wound from said first roller to said second roller in a first direction,   a guide adapted to guide said web of packaging material of said first roller between said first direction and a second direction,   a cutter adapted to cut off said web of packaging material at a first predetermined position and at a second predetermined position,   a wasting station arranged along said second direction and adapted to collect said web of packaging material being cut off between said first predetermined position and said second predetermined position, and   a splicer adapted to splice said web of packaging material of said first roller back together with said web of packaging material of said second roller.   
     
     
         9 . The device of  claim 8 , wherein said guide comprises at least one guiding cylinder being configured to be moveable between at least two positions, whereby guiding the web of packaging material into a second position is performed by changing the position of the at least one guiding cylinder, and whereby guiding the web of packaging material back into the first direction is performed by returning the at least one guiding cylinder to its initial position. 
     
     
         10 . The device according to  claim 8 , further comprising at least one tension control device adapted to provide a pressure onto said web of packaging material in a normal direction to the web of packaging material surfaces so as to provide a tension of the web of packaging material between said first rotatable roller and said second rotatable roller. 
     
     
         11 . The device according to  claim 8 , further comprising a third roller, said web of packaging material being wound from said second roller to said third roller so as to rewind said web of packaging material. 
     
     
         12 . The device according to  claim 8 , wherein said splicer comprises an induction sealing device. 
     
     
         13 . The device according to  claim 8 , further comprising a controller arranged to control operation of the device.