Process for producing a multilayer laminate

A process for producing a multilayer laminate being a photovoltaic (PV) module comprising, in the given order, a protective front layer element, a front encapsulation layer element, a photovoltaic element, a rear encapsulation layer element, and a protective back layer element,

• wherein any one or more of the front encapsulation layer element or rear encapsulation layer element is/are a polymeric layer element(s) (LE);
• the protective front layer element is a first substrate element being a glass element;
• and
• the protective back layer element is a second substrate element being a glass element;
• wherein the polymeric layer element (LE) comprises a polymer composition comprising:
• (a) a polymer;
• and wherein the process comprises the steps of:
• (i) assembling step to arrange the at least one substrate element and the at least one polymeric layer element (LE) in form of a multilayer assembly;
• (ii) heating step to heat up the multilayer assembly;
• (iii) pressure build up step, where the pressure on the multilayer assembly is gradually increased in a single or multiple steps;
• (iv) pressure holding step, where the pressure is kept on the multilayer assembly at the heated conditions attained at the end of step (ii);
• and
• (v) recovering step to cool and remove the obtained multilayer laminate for later use;
• wherein the pressure during pressure holding step (iv) is kept at 790 mbar or below;
• and
• wherein average thickness variation of the resultant multilayer laminate is 60% or less, wherein the average thickness variation (%) is the average of the thickness variation of two opposite edges of the multilayer laminate compared to the middle of the multilayer laminate.