The HAUL-OFF system measures the extensional properties of polymer melts by drawing a vertical melt strand at a constant pull-off speed or with a linear or exponentially accelerating velocity. The HAUL-OFF system measures the force needed to elongate the strand, and calculates elongation stress, draw ratio and apparent elongation rate and viscosity.
The instrument is best used in combination with a suitable high pressure capillary rheometer (e.g. Rheograph 25, 75 or 120) where the device can be located close to the exit of the capillary. It may also be used with an Extrusiometer using a 90° deflection head (or exit) die.