To investigate the influence of internal cooling on the quality of
blown products, the liquid carbon dioxide injection system was
chosen. This system has the biggest cooling effect due to the
introduction of innovative internal cooling variants and therefore
can produce the most obvious results. The cooling effect is
evaluated on two products of different volume and wall
thickness. They are a seven liter container with a 4mm average
wall thickness and a 0,5 liter bottle with a wall thickness of
1,5mm (figure 1).