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Vacuum Compression Moulding Presses

Articles & Resources

Vacuum Compression Moulding PressesMethod for Compression Molding a Cross-linked Preform The invention carried out at our end has helped us to deliver improved bearings for use in orthopedic implant prosthesis. This include particularly in methods for making high molecular weight polyethylene or UHMWPE bearings by molding a cross- linked preform through application of sufficient heat and pressure.

These UHMWPE resins are commonly used for: Here, the stock or molded bearings are irradiated and is subsequently heat treated/heat annealed. The irradiation helps in generating molecular cross-links and free radicals where the free radicals are subsequently eliminated by heat treating processes.

The invention is also directed to method for molding bearing from preform that has previously been cross-linked by obtaining a preform and placing it in press mold defining:
This is done by applying heat and pressure in mold to form bearing. Here, the preform may be produced from irradiated polymer resin for forming cross-links and free radicals followed by molding process. Further, in some embodiments, irradiated UHMWPE preforms may already be heat treated for quenching free radicals.

The present invention is:

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