Compression Rubber Moulding
Compression moulding involves several steps:
- An uncured rubber compound is formed to the proper shape and size based on the finished part configuration. This uncured rubber shape is termed a preform — it is prepared to be formed, or moulded. Every mould will have a different shape and size preform that works best.When the optimal preform has been determined, it is important to have a tolerance on both its size and shape to ensure the part forms correctly. Too much material is wasteful and can cause flash to become too thick, while too little material can cause voids in the part.
- The preform is placed into the cavity of a heated mould. The mould is then closed. Heat and pressure are applied in a compression moulding press. Presses used in production utilise a programmable logic controller to monitor and control critical parameters like temperature, pressure and time to ensure moulding takes place within a prescribed tolerance window.
- The mould is then opened. The cured rubber part is removed along with its flash.
- The part is then moved through the manufacturing operation to undergo post-molding processing, which can include deflashing, postcuring, inspection and packaging.
Benefits of Compression Molding
- Lowest Cost Tooling
Lowest lead time
- Easiest to Prototype
- Widest range of part sizes