Method of forming a mouth roll to a cup of plastic coated...

Details Method of forming a mouth roll to a cup of plastic coated... Method of forming a mouth roll to a cup of plastic coated...

B - Operations, Transporting

31

F

B31F 1/00 (2006.01) B29C 57/12 (2006.01)

Patent

CA 2571068

The invention relates to a method for forming a mouth roll (2) to a cup (1) made of plastic-coated board and to the cup provided with a mouth roll produced by the method. The mouth roll for stiffening the cup is produced with a suitable striking tool bending the board at the mouth of the cup. In accordance with the invention, the mouth roll is additionally stabilised by melting the plastic coating (8) of the board under heat so that the opposite surfaces of the board adhere to each other by heat-sealing in the area of the roll. Melting can be performed e.g. by hot-air blasting directed to the mouth roll at is production stage.

Cette invention concerne un procédé de formation d'une embouchure arrondie (2) sur un gobelet (1) composé de carton recouvert de plastique et concerne également le gobelet doté d'une embouchure arrondie produit par ce procédé. L'embouchure arrondie permettant de rigidifier le gobelet est réalisée à l'aide d'un outil de frappe approprié utilisé pour plier le carton au niveau de l'embouchure du gobelet. Selon cette invention, l'embouchure arrondie est en outre stabilisée selon un procédé consistant à faire fondre le revêtement plastique (8) du carton sous l'effet de chaleur de façon que les surfaces opposées du carton adhèrent l'une à l'autre par thermoscellage dans la zone de l'arrondi. La fusion peut être effectuée, par exemple, par projection d'air chaud sur l'embouchure arrondie lors de l'étape de production.

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