Automatic Shoulder Heading Machine: After tube formation, the tubes automatically move to the auto shoulder heading machine. In this stage, plastic shoulders are formed &attached to the tube body through a heating and fusion process. This process involves dropping molten doughnutsin the mould cavities and then mould mandrils press over it to form shoulder. Chilled water is run to solidify the formed shoulder.This operation forms the neck of the tube where the cap will later be fitted. The heading process requires precise temperature control and alignment to ensure leak-proof bonding and high mechanical strength.