Views: 0 Author: Site Editor Publish Time: 2026-03-10 Origin: Site
Incomplete gas penetration
Flow marks / swirl marks on textured surfaces
Part warpage & deformation
Insufficient gas pressure or holding time
Late gas delay (plastic already cooled)
Unstable melt flow or blocked gas channel
Local thin walls blocking gas movement
Increase gas injection pressure and gas holding time to ensure gas pushes melt to the far end.
Optimize gas delay time: inject gas when the cavity is about 70–80% filled.
Raise melt temperature and mold temperature to lower viscosity for easier gas penetration.
Ensure uniform wall thickness and smooth, continuous gas channels from inlet to end.
Turbulent melt flow over textured/grooved areas
High shear stress
Poor venting
Uneven filling pattern
Use multi-stage injection speed: slow down when melt passes grooves to reduce turbulence.
Increase mold temperature for smoother flow and better surface finish.
Polish cavity surfaces and improve venting near textured zones.
Adjust gate location to avoid direct jetting into delicate surface areas.
Uneven shrinkage (often from incomplete gas penetration)
Insufficient cooling
Unbalanced ejection
Uneven wall thickness
First fix gas penetration to ensure uniform hollow structure.
Extend cooling time and gas holding time to stabilize dimensions before ejection.
Optimize cooling channels for uniform heat removal.
Balance the ejection system to avoid stress-induced deformation.
For minor bending, use fixturing/calibration jigs after demolding.
First solve gas penetration — it’s the root of most deformation and appearance issues.
Use DOE / trial runs to lock in the best parameters.
Apply Moldflow early to predict flow, gas penetration, and warpage.
Maintain clean gas channels, vents, and gates for consistent quality.
