System for applying a product by roller

A system for applying a product (3) by roller comprising:

• an applicator roller (1) for applying a product (3) on a substrate (4),
• a first dosing roller (2′) for dosing said product (3) on a surface of the applicator roller (1),
• at least one second dosing roller (2″) configured to fine-tune the dosing performed by the first dosing roller (2′), thereby adjusting the amount of product (3) dosed on the surface of the applicator roller (1), and
• at least one dosing body (6), wherein the at least one dosing body (6) comprises the first dosing roller (2′) and/or the at least one second dosing roller (2″), wherein the at least one dosing body (6) comprises one or more side walls (7), wherein the at least one dosing body (6) defines, together with the applicator roller (1), a first product collection chamber (9′),
• wherein the at least one dosing body (6) or a collection module (10) defines, together with the applicator roller (1) or the second dosing roller (2″) respectively, at least one second product collection chamber (9″),
• wherein the product (3) contained in the first product collection chamber (9′) remains in direct contact with the surface of the applicator roller (1) during the application of the product (3), and
• wherein the first product collection chamber (9′) produces a bath on the surface of the applicator roller (1) while the surface of the applicator roller remains in said first product collection chamber (9′) where the product (3) is stored.