At 60-80 °C, the liquid food is filled into a cylindrical container of PET. After the bottle is filled, the internal pressure of the bottle is immediately maintained at not more than 400 kPa, and at 5 °C, the internal pressure is maintained at not less than 40 kPa. Then, the bottle was sealed with a cap. Finally, after cooling for 10 minutes, the temperature of the liquid was maintained at not higher than 65°C. The bending strength of the bottle can reach not less than 392.3 N.
Source: Polyester Industry
