A competent mould designer must have a through knowledge of the Engineering principles behind the mould designs.
First of all we will try to cover the Mould cooling
One fundamental principle of Plastic Injection moulding is that hot material enters the mould, where it cools rapidly to a temperature at which it solidifies sufficiently to retain the shape of the part. The temperature of the mould is therefore very important as it governs a portion of the overall moulding cycle. Also ttemperature control of moulds directly proposal to the properties of the thermoplastic injection moulded parts as well.
While the melt flows more freely in a hot mould, a greater cooling period is required before the solidified moulding can be ejected. Again if the melt solidifies too quickly in a cold mould it may not be able to reach the extremities of the cavity. So therefore a compromise between the two extremes must be accepted to obtain the optimum moulding cycle.
Today most of the people are willing to do their Plastic mould design/Manufacture in China. The reason behind this decision was the term "cheep" in other words when they do they can save huge money in $$$. Now I will show you what could be the dangers would come behind this cheep tooling process and what could be the subsequent long term problems will arise and would effect the quality of the Injection moulded plastic part and eventually the final risk involved to collapse the whole engineering systems.
