Question

The pressure temperature combination in formation of glass container is around?

(a) 200 kPa, 650°C

(b) 100 kPa, 750°C

(c) 200 kPa, 500°C

(d) 500 kPa, 150°C

This question was addressed to me by my college director while I was bunking the class.

This intriguing question comes from Manufacture of Glass topic in chapter Glass Packaging Materials of Food Packaging Technology

Answer 1

Correct answer is (a) 200 kPa, 650°C

Easy explanation: Air at about 200 kPa is applied so that the glass is pressed against the metal surface of the blow mold, which is air-cooled to ensure rapid removal of heat. After this, the mold is opened and fully blown parison (at approximately 650°C) is removed. It is then held over a deadplate to further cool it.