Fig. 2 illustrates the relationship between moisture absorption and crystallinity of RPET compounds by air and
water cooling system after exposured in aluminum bags for 3 days. From the results, the RPET compounds were
lower moisture absorptions at higher crystallinity. It was corresponding that moisture absorption is depended upon
the crystallinity of the resin. Hence, moisture content of the resin decreased with increasing crystallinity in the
compounds, which would yield better in mechanical properties of the RPET compounds.