Die stamper assembly, injection compression moulding apparatus and method of manufacturing optical data carriers

An injection compression moulding apparatus comprising:

• a die stamper assembly (1) provided with a first die part (2) for mounting a first stamper (5), a second die part (3) for mounting a second stamper (6), the first die part cooperating with the second die part to define a mould cavity (4) between the first and second die parts, and a venting ring (7) configured around and moveable with respect to the first die part (2) and defining an outer boundary of the mould cavity (4);
• wherein the die stamper assembly includes a venting holder (71) arranged for holding the circumference of the first stamper (5) and positioned between the first die part (2) and the venting ring (7).

A method of manufacturing an optical data carrier comprising:

• the provision of a first disc part (21) with two sides provided with data facing outwards;
• wherein the provision of the first disc part involves injection compression moulding, characterized in that a die stamper assembly (1) is used for injection compression moulding the first disc part (21), the die stamper assembly (1) provided with a first die part (2) for mounting a first stamper (5), a second die part (3) for mounting a second stamper (6), the first die part cooperating with the second die part to define a mould cavity (4) between the first and second die parts, and a venting ring (7) configured around and moveable with respect to the first die part (2) and defining an outer boundary of the mould cavity (4);
• wherein the die stamper assembly including a venting holder (71) arranged for holding the circumference of the first stamper (5) and positioned between the first die part (2) and the venting ring (7).