Method for forming a container

A method for forming a container, comprising the steps of:

• positioning a first preform (10) made of plastic material in a forming chamber (20) of the mould (2);
• counter-shaping the first preform (10) to the forming chamber (20) obtaining the first container (100);
• the step of counter-shaping the first preform (10) comprises the step of performing a blowing the first preform (10) placed inside the forming chamber (20);
• at least a portion of a surface of the mould (2) which delimits the forming chamber (20) being shaped to obtain an opacification of at least a portion of the first container (100);
• characterised by:
• cooling said first container (100) by introducing a gaseous stream into the container (100) for fixing the opacification on the first container (100);
• removing said first container (100) from the mould (2);
• keeping said mould (2) at a higher temperature than room temperature at least from the step of performing said blowing of the first preform (10) to that of removing said first container (100).