Degassing/Breathing Time in Injection molding

The first suggestion in this case must always be "Ask the material supplier". They will have vast experience with the concern that you have raised and may be able to give you a very simple answer.

If they cannot, then you will need to run an experiment. We "normalise" plastic by allowing water to return to dried plastic so that it returns to normal (flexible) condition and I presume that outgassing will be a similar (reversed) process.

The answer will depend on the maximum developed thickness in your part.

Get a moulding run and "measure" (Sniff, weigh, or whatever other means you have) how much odour is still present at various times after the part was moulded. Maybe measure how close you have to get before the odour is offensive, that way you have a variable to use rather than Go/NoGo type of reading and can then predict when the outcome will be "acceptable".

I suspect that ambient temperature, air flow and a few other environmental fators will impact the outcome, so you will need to plan your experiment to understand those factors that you cannot control.

Once you know the time factor, I suspect that your management will want to reduce that. So I can see another thread coming from you in that regard. I've got some ideas, so contact me through the system and I'll send you that separately.

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The mold breathing is better controlled by proper venting, and mold close speed, with bumping if needed. Talk with your material supplier for venting requirements for the specific product you are molding. Preheating melamine helps reduce the total cycle time, and improves the flow characteristics so this could help you too.