Plant for the production of paper logs

Abstract

Plant for the production of paper logs, including a number of operating units configured to produce logs of paper material starting from a web of paper material unwound from one or more corresponding reels and slaved to a control unit that, in turn, is configured for driving the operating units such that each of them has a predetermined production speed. The said control unit is programmed to process data contained in a database individually associated with each reel and representative of defects classified according to a predictive classification based on the effects of the defects in the production of the logs and further representative of the location of defects on the web unwound from the reel. The control unit receives position data related to the instantaneous diameter of the reel from a corresponding detection means. The control unit is programmed to modify the production speed in function of the instantaneous position and of the class of each of the defects.

1 - 6 . (canceled) 
     
     
         7 . Plant for the production of paper logs, comprising:
 a plurality of operating units configured to produce logs of paper material starting from a web of paper material unwound from one or more corresponding reels and slaved to a control unit that, in turn, is configured for driving the operating units such that each of them has a predetermined production speed, wherein   said control unit is programmed to process data contained in a database individually associated with each reel and representative of defects classified according to a predictive classification based on the effects of the defects in the production of the logs and further representative of the location of defects on the web unwound from the reel,   the control unit receives position data related to the instantaneous diameter of the reel by means of corresponding detection means,   the control unit is programmed to modify said production speed in function of the instantaneous position and of the class of each of said defects, and   the modification of the production speed is anticipated in time with respect to the passage of a portion of the web exhibiting a defect, the predetermined production speed being modified according to a predetermined deceleration ramp until a second speed lower than the production speed is reached, followed by a predetermined acceleration ramp until the starting production speed is restored.   
     
     
         8 . Plant according to  claim 7 , wherein said operating units are an unwinder, an embossing unit and a rewinding unit. 
     
     
         9 . Plant according to  claim 7 , wherein the control unit is programmed to reduce said production speed in function of the instantaneous position and the class of each of said defects. 
     
     
         10 . Plant according to  claim 7 , wherein the control unit is programmed to make said production speed equal to zero in function of the instantaneous position and the class of each of said defects. 
     
     
         11 . Plant according to  claim 7 , wherein in said control unit resides a software program that performs said processing by using the data contained in the database and provides instructions to the control unit to change the production speed when required. 
     
     
         12 . Plant according to  claim 7 , wherein the database is recorded in a server having a data output connected with a data input of the control unit.