Mold information

Requirements of Injection Moulding Without Flow Passage for Dustbin Mould


1. The Dustbin Mould has good fluidity and can fill all […]

1. The Dustbin Mould has good fluidity and can fill all parts of the mould cavity under the action of certain temperature and injection pressure. Thermosetting plastics for injection moulding with poor fluidity will cause injection moulding difficulty and filling dissatisfaction, while flash and die sticking will occur if the fluidity is too high.

2. The shrinkage rate of the dustbin mould should be small. If the shrinkage rate is too large, the product is easy to crack or warp. At the same time, the particle size of thermosetting plastics for injection moulding should be moderate and the uniformity should be good. Too fine particles are easy to cause pollution and bridging phenomenon. Too coarse particles make the surface of products dull and the appearance quality is poor.

3. The melt viscosity of the dustbin mould without runner injection moulding is lower than that of the common injection plastic, and the plasticizing temperature of the thermosetting plastic for injection moulding is generally 70-90℃. Thermosetting plastics have low viscosity in the temperature range of 95-120℃, and plastics have better flow performance at this time. Thermosetting plastics have good thermal stability at 70-100℃, the plasticized molten materials can be stored in the charging barrel for a long time, and waste materials can be avoided in the no-flow injection moulding process.

4. The solidification speed of the dustbin mold at high temperature is faster. If the curing speed is too slow, the molding cycle will be too long, and the injection molded products will be easily deformed and unstable in size. If the curing speed is too fast, there will be insufficient filling or loose surface of the plastic parts and the plastic parts will become waste products. At this time, fast-curing materials can be used for high-speed mould filling and curing.