The function of an ejector sleeve is similar to that of an ejector blade,in that both are typically used to push on a vertical section of the molded part.The design of the ejector sleeve varies significantly,however,since it is a hollow cylinder that slides along a fixed core pin to provide an ejection force at the bottom surface of a plastic injection molded boss.Ejector sleeves are very effective components for part ejection,since they push on a stiff portion of the part at a location where friction forces between the molding and the core occur. if you need help, pls contact me, I am Tea, my email is injectionmold2006@163.com whatsapp+8615958816137  skype：injectionmold2006@163.com