How do food packaging companies decide how tight to make the lids of jars? Has this increased over time or am I just getting older?
Roger Miles, St Albans, Hertfordshire, UK
The previous discussion about lid tightness fails to describe the root cause of the intractability of airtight jar lids. It isn’t possible to make an airtight seal between a thin metal lid and the rim of a glass jar on their own. To obtain one, a soft material is needed between the two parts.
This is achieved by a thin layer of plastic around the inside edge of the…
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