2012, pp 1201-1220

Inspecting Glass Bottles and Jars

This is an excerpt from the content

Introduction

Despite the popularity of plastic containers, glass bottles and jars remain important for sealing and preserving food products, toiletries and pharmaceuticals. The raw materials are abundant and inexpensive. Although it is brittle, glass is strong and chemically inert, resistant to microbial attack and impervious to water, oil, alcohol, etc. It can be moulded to form a wide variety of useful shapes. It also has the attractive feature of being transparent, which allows the contents to be presented in a visually appealing way. It can also be coloured for cosmetic effect.

Glass is ubiquitous, yet it is potentially dangerous, particularly if it breaks and the resulting shards are swallowed. There is a wide range of defects in moulded glassware used for food and drink (bottles, jars, cheap tumblers, dishes, bowls, etc.) that should be considered:

  • Malformations (These are often due to moulding faults as when molten glass is injected into the mould when it is too hot, or ...