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Q how to reduce flow marks in injection molding
HunterHolmes
DylanThackeray Release Time: May 23, 2024, 5:17 PM
Flow marks in injection molding, also known as flow lines, are wavy patterns or streaks appearing on the surface of molded parts, detracting from their aesthetic quality. These imperfections can be minimized by optimizing the molding process. Increasing the injection speed can help the material fill the mold before it begins to cool, reducing the risk of premature solidification that leads to flow marks. Elevating the mold temperature also ensures a smoother fill by keeping the material fluid longer. Additionally, adjusting the material temperature can help: higher temperatures increase fluidity, but balancing is crucial to avoid other defects. Using a mold release agent can improve the flow by reducing friction. Design modifications, such as adjusting wall thicknesses and gate locations, can also aid in more uniform material flow. Lastly, considering materials with a higher flow rate for the project might mitigate these issues from the start.
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