Stripper plate ejection is used primarily for the ejection of circular/rectangular box-type moldings and thin walled parts. The plate style stripper delivers a uniform ejection force to the product being produced eliminating the need for multiple ejector pins. More part surface area contact is made than when using small diameter ejector pins. Typical actuation is shown in the “X” Series application. Several other methods are used for actuation, such as pull rods used for 3-plate molds.
Stripper Plate Base Series X Application
The “X” series mold base uses plate X to strip a molded part off of a core located in the BX plate. The “AX” series keeps the stripping plate with the stationary mold half. The “T” series are used for top runner molds (3 plate) that require 2 floating stripper plates which remain with the stationary mold half. You may review D-M-E course 2, Mold Base Technology if required.
Stripper Plate Base Series “X” – Actuation
After molding, the ejector half of the mold base travels back until it reaches its stop position. The ejector rod forces the ejector plate assembly and pins forward, moving the ejector plate forward to strip the part off the core and out of the mold. In the animation here, springs return the ejector plate assembly. On some molds the ejector plate pins push back when the mold closes.
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