Shenzhen Alu Rapid Prototype Precision Co., Ltd.
Industry News
In injection molding, flash (also called flashing) refers to a thin, excess layer of molten plastic that escapes the mold cavity during the injection process and solidifies along the parting line (the seam where the two mold halves meet) or other boundaries between mold sections.
This defect appears as a burr, film, or fin on the finished part and must typically be trimmed or removed post-molding, which adds extra processing time and cost.
How It Forms
Flash occurs when the plastic pressure inside the mold exceeds the clamping force holding the mold shut, forcing material into tiny gaps (often as small as 0.001 inches) between the mold halves or inserts.
It's more common in high-pressure cycles or with materials that have low viscosity.
How It Forms
Flash occurs when the plastic pressure inside the mold exceeds the clamping force holding the mold shut, forcing material into tiny gaps (often as small as 0.001 inches) between the mold halves or inserts.
It's more common in high-pressure cycles or with materials that have low viscosity.