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The following findings show the relationship of absorbed water, exposure time, and relative humidity conditions in a warehouse. The figure below indicates the moisture absorption of post-industrial regrind (PIR) PET materials, stored at various relative humidity conditions as a function of exposure time. After relatively fast moisture absorption at the beginning of the measurements a plateau can be observed after some time due to an equilibrium state. Moreover, an increase of moisture content with increasing relative humidity and vice versa can be observed.
• After a certain time the data approaches a plateau
• The higher the relative humidity, the higher moisture uptake
Procedures to minimize storage time for post-industrial-regrind (PIR) PET materials:
Positive impacts on processing of PET: