Overview
A Core Insert in Jar Preform moulding is a key component of the injection mould used to form the internal dimensions of the preform, especially the neck finish and inner body. It fits inside the mould cavity during injection moulding and shapes the internal surfaces of the jar preform. Core inserts are crucial for ensuring dimensional accuracy, thread quality, and uniform wall thickness in the preform. They are typically made from high-strength materials like hardened tool steel to withstand repeated thermal and mechanical stress.
