Compression moulding is the only plastic moulding process that can mould thermosetting plastics because due to their cross-linked structure, preheating as used in other moulding processes would make the product assume the wrong final shape, by 'curing' earlier in the process. Thermosetting plastics possess excellent electrically insulative properties because they can not burn, only decompose.
The widely application of the Compression moulding is the SMC, that is Sheet Moulding Compound. SMC is used within the production of oil sumps and automotive engine covers. SMC is a fibre-reinforced composite material in sheet form. It primarily consists of a thermosetting resin, glass fibre reinforcement and filler. Additional ingredients such as low profile additives, cure initiators, thickeners and mould release agents are added to enhance performance of processing the material. As with any material system, be it metallic or plastic, SMC can be formulated to meet specific performance requirements of a particular application, such as tensile loading or class "A" surface. SMC is a sheet product which when ready to be used, is laid on to a cutting table and cut into pieces of pre-determined size and shape. The cut pieces are then stacked and assembled in a charge pattern that has been determined to gain the optimum fill, fit and fibre strength within the mould cavity. After charge placement within the mould, the mould is closed and the SMC material is compressed. Typical mould pressures for low-profile SMC are around 50-100 bar.
As the vigorous and state-of-the-art composite enterprise of large scale, Shanghai Yaohua Dazhong Advanced Materials Co., Ltd (referring to YDAM) is one of the pioneering and leading composite enterprises in China's composite automobile part industry. Through years of committing itself to the development of the resin-based composite products, YDAM has continuously brought new products into the market in the domain regarding the design and development of the composite automobile parts.
Until now YDAM has been succeeding in providing composite automobile parts to the following enterprises: Shanghai GM, Shanghai Hui Zhong Automobile Company, China's No. 1 Automobile Group, Dong Feng Liu Zhou Automobile Company, Luo Yang First Automobile Company, Beijing Jeep Company, Nanjing Automobile Group, Chong Qing Aotuo Automobile Company, Shen Yang Jin Bei Company, and so on. With the superior quality and excellent performance, YDAM creates great values for the customers and makes contributions to China's automobile weight-reduction project. In year 2001, the enterprise is tested and approved by Shanghai hi-tech enterprise (product) authentication office.
