Longitudinal Welding Head With Belt Gap for Faster Sheet Sealing

The patent introduces a heated belt as an intermediary element between the welding blocks and the sheets. The belt is heated to welding temperature and contacts the sheets during welding, while the sheets do not need to maintain continuous contact with the welding blocks themselves. This mediator enables reliable heat transfer at higher speeds by decoupling the heating function from the contact constraint.

The patent replaces the mechanical contact-based heating system with a thermally active belt system. Instead of relying on mechanical pressure and continuous contact between sheets and welding blocks, the system uses a pre-heated belt that can be rapidly positioned and removed, substituting mechanical constraint with thermal field control to achieve both reliability and speed.

The patent applies preliminary heating to the belt before it contacts the sheets. The belt is heated to the required welding temperature in advance, so when the sheets contact the belt, the welding action can occur rapidly without requiring the sheets to move slowly through a heating zone. This preliminary thermal preparation enables high-speed effective welding.

The patent introduces dynamic elements including the movable belt system that can be rapidly positioned, accelerated, and decelerated. The belt's dynamic capabilities allow it to maintain optimal contact pressure and temperature during brief high-speed welding intervals, then be quickly removed to allow sheet advancement, creating a dynamic cycle that achieves both effectiveness and speed.