Meaning
Thermal fluid routing controls tool temperature uniformity inside injection moulding equipment by circulating media through drilled channels. Water compensation manages the fluid pressure drop across circuit manifolds to prevent localised cavitation during high speed injection phases. This corrective mechanism adjusts pump output continuously to counteract flow restriction caused by complex core geometry.
Fluid balance stops applying when circuit temperatures exceed boiling thresholds under atmospheric conditions.
Circuit Friction
Hydraulic resistance builds inside cooling lines as scale deposits restrict internal diameters over extended operating cycles. Water compensation overcomes this restriction by elevating supply pressure before the fluid enters the manifold inlet. Narrow cooling paths demand higher baseline pressure to maintain laminar flow profiles across the cavity wall.
Restricted channels generate hot spots that warp amorphous polymers during ejection.
Cavitation Prevention
Low pressure zones form behind sudden bends when fluid velocity outpaces supply replenishment inside the tool. Water compensation eliminates vapour pocket formation by sustaining positive head pressure throughout the injection cycle. Vapour bubbles collapse violently against metal surfaces and erode internal channel walls over time.
Surface pitting destroys thermal transfer efficiency and transfers aesthetic defects to moulded parts.
Dimensional Stability
Shrinkage rates depend directly upon uniform heat extraction from molten resin during the packing phase. Water compensation preserves part dimensions by keeping cooling fluid density stable across multi cavity tools. Fluctuating fluid density introduces residual stress gradients that distort thin walled housings upon release.
Mechanical properties degrade whenever local cooling rates drop below the processing specification.
