Intrinsic viscosity measurement instrument for PET AMETEK Lloyd
Davenport/Lloyd Instruments

The Davenport PETPlus from Lloyd Instruments is a unique test instrument designed for the safe solvent-free intrinsic viscosity (IV) measurement of

moisture-sensitive PET. It can be operated in stand alone mode or with our powerful data analysis software package NEXYGENPlus PET.


Most IV test instruments use the solvent method. However, not only is this method expensive, but also involves the handling and disposal of toxic solvents. The PETPlus instrument by contrast offers significant cost and environmental benefits using a non-solvent method, which is kinder to the environment, and saves on the high cost of purchase and disposal of solvents.


Unlike other IV measurement instruments, the PETPlus can test polymers at virtually all stages of the process: from incoming resin, powder and granules, molten polymer, preforms, PET bottles and even re-ground material.


Tests can be completed in under 20 minutes. Rapid testing can be carried out using ancillary equipment for controlled sample collection and preparation.


The microprocessor controlled system provides high accuracy measurements, temp. control to ±0.1°C and storage of up to 600 results. An LCD displays multi-lingual instructions for the test as well as the results. An RS232 interface allows connection to a PC for fully automated software control and downloading of results.


Molten PET is extruded through a calibrated die by nitrogen gas under pressure and the LVDT probe movement against time is recorded and displayed. The system measures the optimum flow rate and calculates intrinsic viscosity. The PETPlus also measures the degradation factor and provides the mean and standard deviation for the batch.

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