Overflow process

First of all, the cavity is completely filled with melt [analogously compact - injection moulding] and then opens the overflow prior to the fluid injection. The fluid displaces the still liquid melt core from the component into a separate cavity serving as an overflow. Generally, the overflow is later mechanically cut off from the component and gets recycled or reprocessed to other components.

This process offers decisive advantages for complex geometries [flat areas, fastenings or pipe ends] and high requirements to the surface of the component. The surface is formed completely during the melt injection and therefor the fluid injection has no influence on change-over marks, shrink marks or flow lines.

 

 

Suitability:
This method is in particular suitable for components, where only sections are to be blown-out [door pockets, frame covers or recessed grips] or a high surface quality is demanded [car door handles or roof rails].

Moreover, it is always a good choice if the short shot process isn’t possible from the technical and visual point of view and when the melt push back process is unprofitable [quantity].

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