An optimization method for optimizing a shearing bench for shearing a film having a thickness less than or equal to 10 microns, the shearing bench comprising a plurality of elements, each element being characterized by a plurality of parameters, the set of parameters constituting the parameters of the shearing bench , the plurality of elements comprising at least one blade assembly comprising of a blade and a counter-blade that collaborates with the blade , a film progression system for progressing the film and a blade/counter-blade urging system for urging the blade and the counter-blade against one another in order to shear the film , the method including: - a parameter selection step for selecting the parameters of the shearing bench ; - a performance measurement step for measuring the performance of the shearing bench presenting the selected parameters, so as to obtain a measured value for the shearing bench that corresponds to an evaluation criterion for evaluating the shearing bench ; and - a value comparison step for comparing the measured value with a desired value; when the measured value is strictly lower than the desired value, the steps of parameter selection, performance measurement, and value comparison are re-iterated by modifying parameters called main parameters among the selected parameters until such time as the measured value is greater than or equal to the desired value, the method then including a parameter selection step during the last iteration for the operating of the shearing bench , wherein said main parameters are the following: - the thickness of the blade , - the material of the blade , - the thickness of the counter-blade , - the material of the counter-blade , - the speed of rotation of each blade , - the speed of rotation of each counter-blade , and - the speed of progression of the film , the other selected parameters not being modified. - a parameter selection step for selecting the parameters of the shearing bench ; - a performance measurement step for measuring the performance of the shearing bench presenting the selected parameters, so as to obtain a measured value for the shearing bench that corresponds to an evaluation criterion for evaluating the shearing bench ; and - a value comparison step for comparing the measured value with a desired value; when the measured value is strictly lower than the desired value, the steps of parameter selection, performance measurement, and value comparison are re-iterated by modifying parameters called main parameters among the selected parameters until such time as the measured value is greater than or equal to the desired value, the method then including a parameter selection step during the last iteration for the operating of the shearing bench , wherein said main parameters are the following: - the thickness of the blade , - the material of the blade , - the thickness of the counter-blade , - the material of the counter-blade , - the speed of rotation of each blade , - the speed of rotation of each counter-blade , and - the speed of progression of the film , - the thickness of the blade , - the material of the blade , - the thickness of the counter-blade , - the material of the counter-blade , - the speed of rotation of each blade , - the speed of rotation of each counter-blade , and - the speed of progression of the film , the other selected parameters not being modified. <EOS>