Canning and Fish Packaging Technology

Unit 14 - Glass containers and Closures

14.1.13.4.Crown cap or crown cork
This is the most widely used closure by brewing and soft drink trade. It is universally recognized as an extremely good for single journey seal. The cap has a series of flutes around its skirt and the capping chuck closes the flutes under a ring on the bottle finish holding at securely against considerable internal pressure. For proper sealing, a wad made out of cork is used or the cap is internally lined with PVC compound.

Push in cap types: e.g. Cork used in wine bottles.