Apparatus for providing carton blanks with a coating of plastic material

Abstract

Abstract APPARATUS FOR PROVIDING CARTON BLANKS WITH A COATING OF A TRANSPARENT PLASTIC MATERIAL AND WHEREIN PRINTED MATTER ON A SURFACE OF THE CARTON BLANKS IS VIEWABLE BENEATH THE PLASTIC COATING. THE BLANKS ARE FED LONGITUDINALLY IN SUCESSION AND WITH A SLIGHT GAP BETWEEN THE EDGES OF SUCCESSIVE BLANKS TO A STATION WHERE THE TRANSPARENT PLASTIC MATERIAL IS EXTRUDED AS A WEB AND APPLIED IN WEB FORM BY A PRESS ROLL TO THE PRINTED SURFACE OF THE LINE OF BLANKS, THE PLASTIC WEB BRIDGING THE GAPS BETWEEN SUCCESSIVE BLANKS. THE CONTINUOUS COMPOSITE MATERIAL WHICH NOW CONSISTS OF THE WEB OF PLASTIC MATERIAL UNITED TO THE LINE OF CARTON BLANKS IS COOLED BY A COOLING ROLL AND THEN PASSED BETWEEN STRETCH ROLLS RUNNING AT A SURFACE-SPEED IN EXCESS OF THE LINEAR SPEED OF THE COMPOSITE MATERIAL WHICH SERVE TO ACCELERATE THE COMPOSITE MATERIAL AND HENCE EFFECT STRETCHING AND BREAKING OF THE PLASTIC WEB IN THE GAPS BETWEEN SUCCESSIVE BLANKS, THUS SEPARATING THE PLASTIC COATED BLANKS FROM EACH OTHER.

Inventors

• 👤 Torsten Jeppsson
• 👤 Kjell Ingvar Holmstrom
• 👤 Rolf Magnus Dilot

Bibliographic Details