Storage box shell 3-plate plastic injection mold
This type of mould has three main parts or plates, which on opening are separated one from the other to give two daylights. The moulding drop from one daylight and the feed system, in the case of a cold runner type, drops from the other. This facility is extremely useful as it means that the feed system can be segregated from the components by arranging, for example, for the feed system to drop onto one conveyor and the moulding to drop onto another.
To sum up, two plate molds are the most commonly used injection mould. It consists of one parting plane and mold splits into two halves, whereas three plate injection mold consists of two parting planes and mold splits into three sections. Compared to a two-plate mould，this type of mould, therefore, has an additional plate which floats between the fixed and moving plates. The feed system is contained between the fixed plate and the center plate whereas the moulding arc formed between the moving plate and the center plate. The cavity is usually cut in the center or floating plate and each cavity is fed via a pin-point gate from secondary sprue which are also cut into the plate.