Q
reason for cushion variation in injection molding
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Cushion variation in injection molding is influenced by several factors, including material viscosity, machine consistency, mold design, and processing conditions. Material viscosity can change due to temperature fluctuations or variations in the material batch, affecting the cushion required to pack and hold the part effectively. Machine consistency, especially in terms of the injection unit's repeatability, hydraulic system stability, and check valve performance, can cause cushion variability. Mold design, including the type and location of gates and the overall flow path, can impact how the material fills the cavity and requires different cushion sizes to compensate for pressure losses. Processing conditions such as injection speed, pack and hold pressures, and temperatures also play a crucial role. Adjusting these parameters can help control the cushion but must be done within the optimal processing window for the specific material and part design to maintain quality.
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