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darrensandford wrote:I know that I have bought coffee vac-packed in a heat-sealed bag, and within days the bag has ballooned up. Without that valve, I am sure the bag would've ruptured. I believe the CO2 in the bag has a beneficial effect, displacing the oxygen and therefore slowing staleing.
Thoughts?
That is a massive assumption. I think in practice you should assume at least an hour or so, with most roasteries.ubo wrote:On the assumption that beans are packed fresh after roasting (i.e. within a few minutes)
Only if the bag is too small for the coffee it contains and the coffee is roasted to death. IME.then laminate bags with no valve will typically fail after a few days
I believe you. But in the real world this means that valves don't add anything for the consumer, except cost.The reason that bags fitted with a valve still balloon is that that the valves operate on an overpressure release, normally ~ 4-9 mbar with a flow rate of ~1 litre per minute, before closing again at ~0.5 mbar,
wishful thinking
Sorry Zix it doesn't sound like a good idea to me. :Wink:
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