Flow marks in the world of injection molding are like unexpected "imprints" that quietly appear on the surface of plastic parts. Their root cause lies in the subtle interaction of injection pressure and flow speed within the mold cavity. Today, let us together uncover the mystery of flow marks, delve into their causes, and explore effective solutions.
Analysis of Flow Mark Causes:
Cold Mold and Material Temperatures: When mold and material temperatures are low, the flowability of plastic is restricted, easily leaving "footprints" of flow on the surface.
Insufficient Injection Force: If injection speed and pressure are inadequate, plastic has difficulty spreading uniformly during mold cavity filling, resulting in flow marks.
Narrow Runner and Gate Sizes: If runner and gate sizes are designed too narrowly, they will undoubtedly increase the resistance to plastic flow, promoting the formation of flow marks.
Strategies to Solve Flow Marks:
The Power of Warmth: Appropriately increasing mold and material temperatures injects more flow energy into the plastic, allowing it to dance freely within the mold cavity and reduce the trouble of flow marks.
Enhance Injection Dynamics: By increasing injection pressure and holding pressure, while extending holding time, we provide strong support for the uniform filling of plastic.
Accelerate Flow, Enjoy Smoothness: Increasing injection speed allows plastic to quickly fill the mold cavity like flowing clouds and water, effectively reducing the generation of flow marks.
Widen the Channel, Clear the Way: Appropriately increasing the sizes of runners and gates opens up wider paths for plastic flow, reducing flow resistance.
Hot Runner, New Choice: Shortening the main runner size and considering the adoption of hot runner technology further optimizes the flow state of plastic, reducing the occurrence of flow marks from the source.
Through the comprehensive application of these strategies, we can not only effectively address the issue of flow marks but also enhance the overall quality of injection molded parts, making your products even more flawless. On the journey of injection molding, let us move forward together and create brilliance!
