Ejection is simply the mechanism that releases the molded part from the tool. The ejection system can be on either side on the tool depending where the molded part is going to stick. When the ejection system is on the moving side of the molding machine it is a standard ejector system. When the ejection system is on the stationary side of the molding machine it is called a reverse injection system. The most common method of ejection requires the use of ejector plates. But in some cases a stripper plate may be used. In addition under special circumstances air ejection is the best choice.

An ejector plate system most commonly uses ejector pins to that actually make contact and eject the molded part. But ejector sleeves and ejector blades may also be used. Ejector pins being round. Ejector sleeves being a hollow round and ejector blades being rectangular.

A stripper plate system is most commonly used in conjunction with a ejector plate but it can be an independent stand alone plate as well. The only difference is that the molding machine knock out bars makes contact with the ejector plates or directly with the stripper plate.

Air ejection is a system that uses a air poppet to allow compressed air under the molded part. This forces the molded part to be ejected by air pressure. This system is most commonly used on five sided containers. No holes can be present to allow the compressed air to escape before the molded part is ejected.