Discussion
For the 330ml, refillable beer bottle that was considered in this study, the maximum load magnitudes were:
- Internal pressure, 6.1 bars for 20 minutes, corresponding to a 2.5 volume product at a maximum pasteurisation temperature of 63 °C;
- Vertical load, 454 kg for three seconds; and
- Impact, 60cm/sec for less than one millisecond. Based on these data, the strength indices were calculated from equation and are summarised in table 2.