In injection molding, flash refers to a thin layer of excess material that forms around the edges of a molded part, especially along the parting lines, ejector pin locations, or near inserts. Flash occurs when molten plastic leaks out of the mold cavity, usually due to issues with clamping, machine settings, or mold wear.
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Maintaining the correct clamping force, performing regular mold maintenance, optimizing pressure settings, and ensuring accurate mold design are key strategies to significantly reduce and control flash formation in injection molding.
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