Abstract: The paper presented a energy-saving mould structure for no-welding-line injection moulding which not only has a conformal medium trough in the near location from the cavity surface of the fixed mold but also heat isolation layers in the near location from the trough. It can heat and cool the cavity surface uniformly, lower the heat exchange volume, and only need heating the fixed mold and cooling the moving mold to avoid switch of heat and cold media and reduce a lot of energy waste.

Key words: Plastic injection mould, Conformal Cooling Channel, Weld line