Male element of a mould

A male element of a mould for the compression moulding of a parison from a previously prepared dose of thermoplastic material, wherein the male element is associable with a female element of the mould to delimit a forming cavity intended for forming the parison, the male element comprising:

• a die, extending along a longitudinal axis and including a body having, inside it, a longitudinal cavity extending along the longitudinal axis and, at one end of it, a socket in communication with the longitudinal cavity;
• a stretching rod, slidably inserted in the longitudinal cavity and including a terminal portion at one end of it, the stretching rod being movable relative to the die between a retracted position, in which the terminal portion is housed inside the socket to contribute, together with the die, to delimiting the forming cavity, and an extracted position, in which the terminal portion is extracted from the socket so it stretches the parison;
• and
• a passage for an air flow to blow mould the parison to form a container;
• wherein the die internally includes a cooling circuit, configured to allow a flow of a cooling fluid.

A method for the compression moulding and blow moulding of a parison, the method comprising the following steps:

• receiving a previously prepared dose of thermoplastic material in a mould;
• forming the parison from the dose in a forming cavity delimited by a male element and a female element of the mould, wherein the male element comprises a die extending along a longitudinal axis and including a body;
• stretching and blow moulding the parison to form a container, wherein blow moulding includes blowing an air flow into a passage of the male element,
• wherein the male element comprises a stretching rod slidably inserted in the longitudinal cavity and including a terminal portion at one end of it, wherein the stretching rod is movable relative to the die, wherein in the step of forming, the stretching rod is at a retracted position, where the terminal portion is housed inside the socket to contribute, together with the die, to delimiting the forming cavity, and in the step of stretching it is at an extracted position, where the terminal portion is extracted from the socket so it stretches the parison;
• and
• cooling the die by passing a cooling fluid through a cooling circuit inside the die.