Abstract: A method for treating workpieces (307, 801, 802, 803) to be injection moulded in a production process comprises a step for forming a workpiece (307, 801, 802, 803) by injection moulding so that during the injection moulding, the workpiece is fastened to a given elongated transport arrangement (301, 302, 304, 305, 306). The workpiece (307, 801, 802, 803) is moved forwards in the production process by means of the elongated transport arrangement (301, 302). Subsequently the fastening (311) of the workpiece (307, 801, 802, 803) is partly detached from the elongated transport arrangement (305, 306) and the workpiece (307, 801, 802, 803) is fastened, supported by the fastening remaining between itself and the transport arrangement, into a position where it is substantially outside a plane (800) defined by the transport arrangement.