AUTOMATIC CONTROL OF INJECTION PRESSURE

05/04/2018
PETplanet Insider

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Process control, stable product characteristics and improved energy efficiency: Piovan claims that these aims have now also been achieved in PET treatment thanks to its Automatic Injection Pressure Control (AIPC) Technology.

AIPC is the new Piovan patent­ pending technology which enables the injection moulding machine to "guide" the Genesys drying system so that it operates with a constant injection pressure around a cus­tomer-defined set point. In a conventional PET preform production system, the resin drying phase is not connected to injection and preform production: therefore, the pressure does not always fall within a predetermined range of values which could ensure a con­stant product quality throughout the cycle. On the contrary, the pressure fluctuates continually, causing pos­sible variations in the characteristics of the PET products.

lnjection pressure
lnjection pressure is a fundamen­tal process parameter, because it is directly dependent on the amount of water left in the PET after the drying process. Keeping it constant ensures that the preforms produced always have the desired properties and physical characteristics.

Prior to the introduction of auto­matic pressure control, Genesys dryer's performance was optimised using the AECS algorithm, based on measurement of the weight loss of the dried material. Equipped with a state-of-the-art control, Genesys is a "self-adaptive" system: it auto­matically, continually manages the quantity of air to be introduced into the production process; further, it allows reductions of 35% to 55% in electricity consumption, indepen­dently stabilises the air flow in the drying hopper and recovers energy for sieve regeneration, creating additional savings compared to the conventional systems currently used for PET processing.

 

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