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12/1/2011 | 1 MINUTE READ

Free Smartphone App Calculates IV for PET Blends

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WEB EXCLUSIVE: PET Packaging specialist Plastic Technologies, Inc. (PTI) has launched a free app that calculates the intrinsic viscosity (IV) of blends of virgin and recycled PET. The PET Blend Calculator is available on the Apple iPhone and iPad as well as Android platforms. Virgin and recycled PET have different IVs, and as the use of recycled PET grows, so does the need for a quick way to calculate a blend’s IV.
The first screen of this new app asks the user to plug in the volume percentage and IV for the virgin and for the recycled resin. Tapping the screen’s “submit” button produces a display of the blend’s IV and the molecular weights of each resin ingredient and the final blend. Next, the user is prompted to a second screen, a PET Hydrolytic Degradation Nomograph, to input moisture content in percent or ppm. The blend IV number from the previous screen is carried over to the new screen and plotted against the moisture information to obtain final IV results. This device is intended to reduce the chance of making under-performing PET preforms, bottles, or thermoformed products. The new app can be found in the iTunes App Store or the Android Market by searching for “PET Blend Calculator.”