Extrusion dimension stability begins with the line record

Extrusion production note

For profiles, sheet and pipe, we do not attribute a size change to one ingredient until the line record has been checked. Melt pressure, zone temperatures, screw speed, haul-off, cooling and ambient conditions can all move the result.

Measurements are taken at fixed positions and after the same conditioning period. We also record line speed and output because a formulation that appears stable at one rate may behave differently when the line returns to normal production speed.

Send a time sequence, not one reading

A useful record shows dimensions, pressure and temperature over the same production period, with the time of any material or setting change marked. Add the die size, product drawing, resin lot and current formulation so we can see whether the variation is temporary or repeatable.