and also at the end of storage period. The
headspace relative humidity was monitored over time using data
logger (ALMEMO 2490, Ahlborn, Holzkirchen, Germany). The
water vapour absorption of the trays was gravimetrically deter-
mined by measuring increase in weight of the tray at the end of
storage period. The amount of water transmitted over the lidding
film was gravimetrically measured by weighing the package at the
start and at the end of storage period. The amount of condensation