Plastics Technology

APR 2017

Plastics Technology - Dedicated to improving Plastics Processing.

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Check out our product video (707) 838-6272 sales@microvu.com www.microvu.com EXCEL 501 Automated Machine 500x400x160mm $48,200 VERTEX 251 Automated Machine 250x160x160mm $35,275 SOL 161 Manual Machine 160x160x160mm $14,775 Prices include InSpec Metrology Software. Other models with sizes up to 2500x1600mm. AUTOMATE Measuring PLASTIC Parts? MICRO - VU'S FAMILY of MEASURING MACHINES is a FAST , ACCURATE , and EASY solution. changed the formulation to a 50% post- industrial reclaim (PIR) and 30% PCR PET flake blend. The third simulation repeated the formulation used during the first simu- lation, while adding the devolatilization benefits of the high-vacuum twin-screw extruder using a patented Bandera HVTSE co-rotating twin screw. And finally, the fourth simulation repeated the formulation of the second simulation while also adding the benefits of the HVTSE process. For each of these four simulations, the results demonstrate that the virgin cap layers maintain their suitability as a func- tional barrier, since the resultant uncontam- inated virgin cap-layer thicknesses exceed the 1-mil FDA recommendation. The third and fourth simulations further demonstrate the devolatilization benefits using the HVTSE dryer-less process, which is shown to increase the resultant uncontaminated virgin cap-layer thicknesses (i.e.; the resul- tant functional barrier-layer thickness) due to a significant reduction of contaminant concentration levels in the core layer. In summary, this study effectively demonstrated the importance of various factors with regard to contaminant migra- tion, the most significant being the correla- tion of higher migration rates at increased application temperatures. In the Fraunhofer Assessment, it was reported that the permeation rate at 212F (100 C) was rapid (contaminant breakthrough time through a 0.5-mil cap layer was about 1 day), but at room temperature the rate was much slower (equivalent contaminant breakthrough time was predicted to be greater than 100 years). Other conclusions from this study Net Concentration Toluene, ppm Net Concentration Toluene, ppm 0 100 200 300 400 500 600 700 800 0 100 200 300 400 500 600 700 800 40 Mil Sheet, mils 40 Mil Sheet, mils Virgin Cap Virgin Cap Core Core Concentration of Toluene in Core, Cap Layers at the End of Extrusion Process FIG 2 Single Screw With PIR Single Screw Without PIR 20 16 12 8 4 0 20 16 12 8 4 0 Simulation model assumes a sheet structure of 10/80/10% virgin/regrind/virgin at 2000 lb/hr and HVTSE operating at 75% devolatilization of PC =Final =Final 54 APRIL 2017 Plastics Technology PTonline.com BARRIER PACK AGING

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