Canning and Fish Packaging Technology

Unit 14 - Glass containers and Closures

14.1.12.Functions of closures

• A closure must make a satisfactory seal in line with technical requirement of the product and maintain it till the contents are used.
• It must be possible for the intending user to open the containers without any difficulty (e.g. ; jam jars –more vacuum more difficult to open).
• If the product is used over a period of time, it must be able to reseal properly and easily.
• The closure must not affect the contents.
• It must be possible to fit the closure under specified condition that is it a speed required by the packaging line.
• Closure may enhance the appearance of the product and give information about the product enhancing the sales appeal.