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 , wherein a laminating pressure is exerted on the laminate in the nip between the laminating rolls , 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 (YS) 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 , wherein a laminating pressure is exerted on the laminate in the nip between the laminating rolls , 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 (YS) 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 (YS) 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 % <EOS>