Process for laminating a polyester film onto a major surface of a metal strip substrate in a coating line comprising the subsequent steps of: - providing a metal strip substrate; - providing a Machine Direction Oriented polyester film having a roomtemperature yield stress YS for laminating onto the major surface of the metal strip substrate; - providing an adhesion layer for promoting the adhesion between the metal strip substrate and the polyester film, and/or - heating the metal strip substrate to a temperature T1 above Tg and below Tm of the polyester facing the major surface of the metal strip substrate; - forming a laminate by pressing the polyester film onto the metal strip substrate by means of laminating rolls (2, 2'), wherein a laminating pressure is exerted on the laminate in the nip between the laminating rolls (2, 2'), and wherein tension is exerted on the polyester film in the longitudinal direction of the film prior to entering the nip; - heating the laminate to a temperature above Tm of the polyester film to melt the polyester film; - quenching the heated laminate with the molten polyester film to a temperature below Tg of the polyester film, the method being characterised in that: the tension as a percentage of the yield stress of the polyester film (X tens) is at least X tens % = 50 * v − 0.46 wherein the line speed of the coating line is v (in m/min), and in that the tension (F tens) on the polyester film in MPa is F tens = YS * X tens % - providing a metal strip substrate; - providing a Machine Direction Oriented polyester film having a roomtemperature yield stress YS for laminating onto the major surface of the metal strip substrate; - providing an adhesion layer for promoting the adhesion between the metal strip substrate and the polyester film, and/or - heating the metal strip substrate to a temperature T1 above Tg and below Tm of the polyester facing the major surface of the metal strip substrate; - providing an adhesion layer for promoting the adhesion between the metal strip substrate and the polyester film, and/or - heating the metal strip substrate to a temperature T1 above Tg and below Tm of the polyester facing the major surface of the metal strip substrate; - forming a laminate by pressing the polyester film onto the metal strip substrate by means of laminating rolls (2, 2'), wherein a laminating pressure is exerted on the laminate in the nip between the laminating rolls (2, 2'), and wherein tension is exerted on the polyester film in the longitudinal direction of the film prior to entering the nip; - heating the laminate to a temperature above Tm of the polyester film to melt the polyester film; - quenching the heated laminate with the molten polyester film to a temperature below Tg of the polyester film, the method being characterised in that: the tension as a percentage of the yield stress of the polyester film (X tens) is at least X tens % = 50 * v − 0.46 wherein the line speed of the coating line is v (in m/min), and in that the tension (F tens) on the polyester film in MPa is F tens = YS * X tens % the tension as a percentage of the yield stress of the polyester film (X tens) is at least X tens % = 50 * v − 0.46 wherein the line speed of the coating line is v (in m/min), and in that the tension (F tens) on the polyester film in MPa is F tens = YS * X tens %