Q
what is cushion in injection molding
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In injection molding, the cushion is a critical parameter referring to the small amount of plastic material left in the barrel of an injection molding machine after the injection and packing phase of the cycle. This leftover material acts as a buffer or "cushion", ensuring that there is always material under pressure in front of the screw to maintain consistent pressure in the mold cavity until the gate seals. This prevents short shots and ensures the mold is completely filled and packed under optimal pressure. The cushion helps in compensating for variations in plastic volume and viscosity, facilitating a more consistent molding process and higher quality parts. Adjusting the cushion is essential for optimizing the injection molding process, affecting the quality of the final product.
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