Air-cooled chill roll apparatus for inspection equipment

Abstract

Chill roll apparatus for inspection equipment for sheet plastic material, comprising a chill roll ( 1 ) designed for air cooling. In such equipment comprising a detecting unit ( 2 ) for detecting defects in the material, such a chill roll is arranged to receive the material supplied to the equipment for inspection.

1 . Chill roll apparatus for inspection equipment for sheet plastic material, comprising a chill roll designed for air cooling, characterized in that said roll has a plurality of axially extending through holes to permit air to be blown through said roll in the direction of its axis, and in that at least one fan is arranged to blow air into the holes at one end wall of the roll.  
     
     
         2 . Apparatus as claimed in  claim 1 , characterized in that at least one heating element is arranged to heat the roll.  
     
     
         3 . Apparatus as claimed in  claim 2 , characterized in that said heating element comprises an IR heater arranged to heat one end wall of the roll.  
     
     
         4 . Apparatus as claimed in any one of the preceding claims, characterized in that the roll is made of copper.  
     
     
         5 . Apparatus as claimed in any one of the preceding claims, characterized in that at least one temperature sensor is arranged to measure the temperature of the roll.  
     
     
         6 . Apparatus as claimed in  claim 5 , characterized in that the temperature sensor comprises an IR temperature sensor which is arranged to measure the temperature at the outer edge of the roll without coming into contact therewith.  
     
     
         7 . Apparatus as claimed in any one of the preceding claims, characterized in that a temperature control unit is arranged to control the heating element and/or fan depending on the actual value of the roll temperature measured by the temperature sensor and a predetermined set point for the temperature supplied to the control unit.  
     
     
         8 . Apparatus as claimed in  claim 7 , characterized in that the fan is constructed for pulsed operation and in that the temperature control unit is arranged to control the cooling by varying the length of the pulses during which the fan is in operation.  
     
     
         9 . Apparatus as claimed in  claim 7  or  claim 8 , characterized in that the temperature control unit is arranged to control the speed of the fan.  
     
     
         10 . Apparatus as claimed in any one of claims  7 - 9 , characterized by several cooling fans individually controlled by the temperature control unit.  
     
     
         11 . Apparatus as claimed in any one of claims  7 - 10 , characterized by several heating elements individually controlled by the temperature control unit.  
     
     
         12 . Equipment for continuous inspection of sheet plastic material, comprising a detecting unit for detecting defects in the material, characterized in that a chill is roll apparatus as claimed in any one of the preceding claims is arranged at the entrance of the equipment, to receive the material supplied to the equipment for inspection.  
     
     
         13 . Equipment as claimed in  claim 12 , characterized in that the chill roll apparatus comprises a second chill roll so arranged that the material supplied to the equipment for inspection runs between the chill rolls.