Meaning
Laboratory measurement techniques determine the kinematic viscosity of fluids by measuring flow time through a narrow tube. Performing capillary viscometry requires precise temperature controls because polymer behavior shifts with minor thermal changes. This measurement confirms the readiness of a batch before release to the extrusion line.
Melt Behavior
Rheological behavior affects how a polymer flows under stress. High molecular weight polymers display higher resistance, which increases pressure in the die. This resistance changes the required extrusion speed and limits overall throughput capability.
Instrument Calibration
Calibration processes must use certified reference standards to maintain accuracy across different testing runs. Run times through the glass tube are measured against known standards to identify drift in the sensor arrays. This protocol guarantees that the recorded viscosity matches the actual physical properties of the batch.
Clean instruments prevent residue build up that would otherwise distort the time measurements and lead to false rejections of usable materials.
Production Delay
Releasing a batch before viscometric verification increases the risk of product failure. The delay caused by retesting a suspect batch is minor compared to the cost of purging a jammed extruder. A firm must maintain strict holding times for all raw inputs.
