Co-injection moulded sports boot

A method for manufacturing a sports boot element, comprising:

• injecting a first plastics material in a mould, not occupying an entire surface of the mould;
• injecting into the same mould a second plastics material, different from the first plastics material, after the injection of the first plastics material and before the first plastics material has completely hardened, using a co-injection moulding principle,
• so as to obtain the sports boot element having a wall comprising at least first and second different co-injection moulded plastics materials that are injected into a same mould via at least one same injection point through which the at least first and second different co-injection moulded plastics materials pass in succession, wherein the wall further comprises:
• a first zone of the wall comprising the first and second different plastics materials within its thickness, the first plastics material forming two layers of the wall constituting an internal face of the wall facing inside of the boot and an external face of the wall opposite the internal face of the wall, and the second plastics material being interposed between the two layers of the first plastics material,
• a second zone of the wall comprising only the second plastics material within its entire thickness from the internal face of the wall to the external face of the wall,
• wherein the first material and the second material are different type plastic materials,
• wherein the first plastics material is more rigid than the second plastics material, and
• wherein the first zone includes at least one region within the group consisting of a rear part and a lower part of the sports boot element, and wherein the second zone includes at least one region within the group consisting of a frontal part, a flap and an instep of the sports boot element.

A method for manufacturing a sports boot element, comprising:

• co-injection moulding first and second plastics materials from at least one selected from the group consisting of (i) two injection points located at two distinct points of a mould intended for the manufacture of a lower shell of a ski boot, the two points being positioned at two different heights at a rear part of the lower shell, and (ii) at least two injection point located at several distinct points of a mould intended for the manufacture of a ski boot lower shell, the various injection points being positioned underneath a sole of the lower shell,
• so as to obtain the sports boot element which is a lower shell having a wall comprising at least first and second different co-injection moulded plastics materials that are injected into a same mould via at least one same injection point through which the at least first and second different co-injection moulded plastics materials pass in succession, wherein the wall further comprises:
• a first zone of the wall comprising the first and second different plastics materials within its thickness, the first plastics material forming two layers of the wall constituting an internal face of the wall facing inside of the boot and an external face of the wall opposite the internal face of the wall, and the second plastics material being interposed between the two layers of the first plastics material,
• a second zone of the wall comprising only the second plastics material within its entire thickness from the internal face of the wall to the external face of the wall,
• wherein the first material and the second material are different type plastic materials,
• wherein the first plastics material is more rigid than the second plastics material, and
• wherein the first zone includes at least one region within the group consisting of a rear part and a lower part of the sports boot element, and wherein the second zone includes at least one region within the group consisting of a frontal part, a flap and an instep of the sports boot element.