A combined demoulding method and assembly method of injection moulded articles, in particular for demoulding the mould halves of contact lenses and assembly of the contact lens moulds consisting of respectively the two contact lens mould halves, with the steps: a: demoulding of K first injection moulding parts, in particular lower contact lens mould halves, from K circularly arranged first cavities and simultaneous demoulding of K second injection moulding parts, in particular upper contact lens mould halves, from K circularly arranged second cavities with a demoulding device; b: simultaneous transfer from a part-circularly, in particularly semi-circularly, arranged first part, in particular a first half, of the K first injection moulding parts and from a part-circularly, in particular semi-circularly, arranged first part, in particular a first half of the second injection moulding parts to a linearizing device, and relative adjusting of demoulding device and pivoting device and thereafter simultaneous transfer from a part-circularly, in particular semi-circularly, arranged second part, in particular a second half, of the K first injection moulding parts and from a part-circularly, in particular semi-circularly, arranged second part, in particular a second half, of the second injection moulding parts to the linearizing device; c: relative adjusting of the first and second injection moulding parts (UT, OT) on the linearizing device such that the first part of the K first injection moulding parts and the first part of the K second injection moulding parts and the second part of the K first injection moulding parts and the second part of the K second injection moulding parts are respectively arranged in a row; d: simultaneous transferring of the first and second part (3, 5) of first injection moulding parts to an intermediate store and thereafter simultaneous transferring of the first and second part (4, 6) of the second injection moulding parts to the first and the second part (3, 5) of the first injection moulding parts, in particular placing onto the latter, and thereby forming of injection moulding pairs, in particular contact lens moulds, respectively comprising a first and a second injection moulding part (UT, OT); e: multiple repetition of steps a to d, wherein injection moulding pairs are arranged so that the first injection moulding parts, respectively originating from the same first cavity, of different injection moulding processes form respectively a group, preferably arranged as a row, on the intermediate store, wherein each group respectively also comprises second injection moulding parts of the same second cavity. a: demoulding of K first injection moulding parts, in particular lower contact lens mould halves, from K circularly arranged first cavities and simultaneous demoulding of K second injection moulding parts, in particular upper contact lens mould halves, from K circularly arranged second cavities with a demoulding device; b: simultaneous transfer from a part-circularly, in particularly semi-circularly, arranged first part, in particular a first half, of the K first injection moulding parts and from a part-circularly, in particular semi-circularly, arranged first part, in particular a first half of the second injection moulding parts to a linearizing device, and relative adjusting of demoulding device and pivoting device and thereafter simultaneous transfer from a part-circularly, in particular semi-circularly, arranged second part, in particular a second half, of the K first injection moulding parts and from a part-circularly, in particular semi-circularly, arranged second part, in particular a second half, of the second injection moulding parts to the linearizing device; c: relative adjusting of the first and second injection moulding parts (UT, OT) on the linearizing device such that the first part of the K first injection moulding parts and the first part of the K second injection moulding parts and the second part of the K first injection moulding parts and the second part of the K second injection moulding parts are respectively arranged in a row; d: simultaneous transferring of the first and second part (3, 5) of first injection moulding parts to an intermediate store and thereafter simultaneous transferring of the first and second part (4, 6) of the second injection moulding parts to the first and the second part (3, 5) of the first injection moulding parts, in particular placing onto the latter, and thereby forming of injection moulding pairs, in particular contact lens moulds, respectively comprising a first and a second injection moulding part (UT, OT); e: multiple repetition of steps a to d, wherein injection moulding pairs are arranged so that the first injection moulding parts, respectively originating from the same first cavity, of different injection moulding processes form respectively a group, preferably arranged as a row, on the intermediate store, wherein each group respectively also comprises second injection moulding parts of the same second cavity.