Ensure Quality and High Yield from PET Resin to Preform
To be sure of consistent quality in the finished bottle, you need consistency in raw materials, so accuracy is critical in blending of PET materials for the production of preforms. Virgin PET, in-house regrind and post-consumer reclaimed material, colorants and additives need to be precisely metered and thoroughly mixed. If you use reclaimed PET in your
preforms, you probably have a very specific target percentage. Below that target and they won’t meet environmental and economic commitments. Over the target and the blend may need to be recrystallized or you risk having the amorphous regrind agglomerate (clump together) in process equipment. Therefore, accuracy to within 0.5% is required. An improved control algorithm intelligently analyzes dozens of weight readings in a matter of milliseconds, filtering out electronic noise and the effects of vibration. After every dispense cycle, the control adjusts automatically for minor variations in dispensing, as well as for changes in resin bulk density and particle geometry. The mixing chamber is totally enclosed, ensuring that all pellets and minor ingredients are accounted for.
For PET preform producers who have special requirements, TrueBlend units can also be customized to include such unique options as:
• Flow inducers in material bins.
• Optional vertical augers, which operate whenever the dispense valve is open, ensure that even difficult-to-flow materials like
PET bottle regrind flakes are fed smoothly to the weigh bin. No material hang-ups. Accuracy in Blending and Feeding High
-temperature blending components
– including load-cells, level sensors and air cylinders, are specified for their ability to stand up to temperatures of 350°F (175°C) and higher.
Electronic components are isolated from elevated temperatures. This prevents premature failure or generation of erroneous data that results in diminished mixing accuracy. Now you can confidently blend high levels of regrind direct from the crystallizer or you can dry preform materials before they are blended, preventing separation of ingredients
in the drying hopper.