METHOD FOR MANUFACTURING A LARGE-DIMENSION PLASTICS SHELL BY MOULDING AND OVERMOULDING, SHELL PORTION AND SHELL OBTAINED BY THIS METHOD

摘要

The invention relates to a method for manufacturing a plastics shell which comprises two opposite large faces (2, 3) and has a greatest dimension (L), measured along one large face, that is greater than or equal to 10 times the greatest thickness of the shell measured between the large faces and is greater than or equal to 100 mm, said manufacturing method comprising at least the following steps of: -moulding a first shell portion (C1) comprising at least a part of one of the large faces (2) of the shell (C) and, away from the large face, an overmoulding surface (10) that is at least partially grooved and/or toothed with grooves (11) and/or teeth (12) which have a width (I) or thickness less than or equal to 5 mm and which are spaced apart from one another at a pitch (P) less than or equal to 5 mm, -overmoulding, on an overmoulding surface (10), a final shell portion (C2) comprising at least a part of the other large face (3) of the shell (C), all the shell portions being made of the same material as the first shell portion and the local thickness of each shell portion being greater than or equal to 1 mm in the regions at least 1 mm away from the edges of the corresponding shell portion. The invention also relates to the first shell portion and to the shell incorporating the first and final shell portions.