Patent ID: 8852493
Filing Date: 2014-10-07
Classification: B29C,B29L,B31B,B31F,B65D

Abstract:
1. A method for forming a cup having a mouth roll made of plastic-coated cupboard, comprising the steps of: forming the roll at the mouth of the cup by bending the board to a rounded configuration, at least one surface of the board being plastic-coated so that an inner wall of the cup has a plastic coating layer thereon; and subsequently stabilizing the roll of the rounded configuration by melting the plastic coating of the board with heat by laser radiation which is directed to the base of the roll of the rounded configuration from the underside thereof, so that the plastic coating layer of the inner wall is bonded to the outer wall of the cup to form said roll of said rounded configuration and the cup has the stabilized rounded configuration at the mouth.