Method of rigidifying the tearing edge of a carton

Details Method of rigidifying the tearing edge of a carton Method of rigidifying the tearing edge of a carton

B - Operations, Transporting

31

B

117/67

B31B 1/74 (2006.01)

Patent

CA 1068175

ABSTRACT OF THE DISCLOSURE A tearing edge is formed at an edge of a paperboard blank according to the present invention by arranging a plurality of paperboard blanks in a stack with the edges which are to be reinforced disposed in a common plane and applying a clamping force to the stack of blanks applying to the edges which are to be reinforced a coating fluid of a type which is at least semi-rigid when set and allowing the coating to set to form a rigidifying edge and thereafter releasing the clamping force to permit separation of the blanks from the stack.

242557

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