Meaning
A physical orientation shear heat measurement identifies the volumetric energy dissipation inherent to specific polymer melt flows during injection moulding. Posh quantification defines the thermal profile by tracking the relationship between local shear stress and the resulting temperature rise at the gate entry. Precise data regarding these thermal inputs allows operators to prevent molecular degradation before resin enters the cavity.
Moulding Physics
Processing variables rely on this value to predict the window where viscous dissipation offsets applied heater band energy. This metric isolates the heat generated by friction between polymer chains from the heat transferred via machine metal. Maintaining control over this thermal output stops premature crosslinking in thermosets or chain scission in thermoplastics during high-speed injection.
Regrind Economics
Recycled materials exhibit lower viscosity than virgin counterparts because the average molecular weight decreases with each thermal history cycle. Posh quantification detects these deviations by recording higher localized shear heat levels at identical injection pressures. Manufacturers verify the integrity of mixed feedstock batches by comparing current heat profiles against a validated virgin baseline.
Part Specification
Finished geometry requirements depend on the consistency of the shrinkage rate across the entire production run. Uncontrolled internal heat alters the crystallinity of the solidified part and causes localized density changes that lead to dimensional warpage. Stabilizing the shear heat profile throughout the cycle produces components that consistently fall within the tolerance bands required for final assembly.
