Ejector plate is inserted into the core plateįigure A shows the most common type. Distance screw holds the ejector plate C. On the cavity plate when the mold closes.Ĭons: Complicated mold structure, and high manufacturing cost.Ī. Simpler than that of the ejector sleeve, and there is no need for a resetter,īecause the ejector mechanism can be reset by the thrust of the mold parting surface The main feature of this ejector mechanism is that the ejectorįorce is high, uniform and stable, and the plastic parts are not prone toĭeformation, without ejector marks on the surface. Striper plate is suitable for the ejection ofĬylindrical plastic parts, thin-walled containers and various shell-shaped To make it easy for mold release, the ejector structure that combines the ejector block and the ejector pin is used.
In some molds, since the side wall of the finished product is too deep, it is easy to wrap around the mold core and produce a large mold release force. Pros: Large and uniform ejector force, without obvious marks.Ĭons: Difficult manufacturing and assembly, easy to wear and tear, and high cost. Used to eject elongated bolts and cylindrical parts. After the mold is opened, the sleeve ejects the product wrapped around the pin. The sleeve is installed on the ejector plate, while the pin is installed on the base plate. The ejector sleeve is a mechanism that has to be adopted when there is a circular through hole or blind hole on the product required to be ejected. The ejector sleeve is used in combination with the ejector pin, referred to as the sleeve pin set, which is one of the accessories of a plastic injection mold. The ejector sleeve is a hollow ejector pin. Rectangular ejector pin holes are usually machined by wire cutting, and the pins need to be quenched to make it sufficiently strong and wear resistant.Ĭons: Difficult machining, easy to wear, and high cost There are certain limitations on ejector location.Įjector blade (Rectangular Ejector): When the finished product features a smaller space and a deeper rib, which makes it hard to arrange the round ejector pin, the flat-top rectangular ejector pin is used instead, which is usually located at the bottom of the rib of the finished product. Round Ejector Pin: As the most common and simple ejector, a round ejector pin and the hole are easy to machine, so they are widely applied as standard parts. Product ejector force is greater than the holding force that is caused by product shrinkage. Usually, the end surface of the ejector pin is 0.05-0.1mm lower or higher than mold cavity surface.
For simple and large products, the ejector stroke The ejector stroke is usually 5-10mmĪfter the product is released from the mold. Transparent products, attention should be paid to the selection of ejector Hidden surface or non-decorative surface of the product. In order to avoid ejector marks thatĪffect the appearance of a product, the ejector system should be located on the With great rigidity, such as the rib, flange, and wall edge of the shell-shaped Part where the product is able to withstand the maximum force, i.e., the part To protect the product from deformation,Ĭracking, or perforation caused by ejection, the ejectors should act on the Air Ejection Ejection System design principles Ejector Block 5.Stripper Plate 6.Lifter 7. Round Ejector Pin 2.Ejector blade(Rectangular Ejector ) 3.Ejector SleeveĤ. So, this is where the ejection system – which falls into the following categories – comes in:ġ. Product ejection cannot be neglected, and during the ejection process, the product should be protected from deformation, ejector marks, cracking and other damages. After a product solidifies in the mold, an effective method is needed to eject it from the mold.
Product ejection is the last step in the plastic injection molding process.
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