Apparato e metodo per stampare a compressione oggetti concavi

Described is an apparatus comprising: a dispensing device (2) for dispensing doses (D) of polymeric material in a form suitable for compression moulding; a mould (5) for receiving said doses (D) and making concave objects; a plurality of transport elements (7) of respective doses (D), each of which configured for picking up the respective dose (D) from the dispensing device (7) and releasing it to said mould (5); a carousel (8) for supporting said transport elements (7) for feeding each element (7) in an advancement direction (A) and along a closed path (C) passing between the dispensing device (2) and the mould (5), so as to bring the dose (D) to the mould (5); wherein each transport element (7) comprises a wall (9) for engaging the dose (D) rotatably mounted on the carousel (8) between a picking up condition wherein the wall (9) has a respective surface (9a) for contact with the dose (D) transversal to the advancement direction (A) to intercept and pick up the dose (D) from the dispensing device (2), and a condition for releasing the dose (D) wherein the wall (9) is overturned with the contact surface (9a) facing the mould (5) for releasing the dose (D) in the mould (5) by gravity; and wherein it comprises cooling means (11) of each transport element (7) for cooling said transport element (7) at least in a zone (T1, T2) of the closed path (C).