If you are a sourcer of coffee bags, maybe you were noticed by your QC at one time that the bags can not be vacuumed.
When you discuss with your packing pouch vendor, they can not reply with a reasonable answer because the valves was purchased from another supplier.
Most of the coffee bag manufacturers can not produce the valves by themselves, because the coffee bag and degassing valve are totally in the two different fields.
What Is One-Way Degassing Valve ?
One-way degassing valves are designed to allow pressure to be released from air-tight packing-pouch meanwhile preventing air from getting back into the packing-pouch.
Air, especially the Oxygen(O2) portion of air, can have negative effects on the package contents and its freshness.
And, this one-way degassing valve can prevent the break up caused by inside air during the shipping or storing.
Furthermore, Air leak may happen due to the quality problem during the valve working
(either can release the gas generated and make the air entry.)
Can You Distinguish Below One-Way Degassing Valves And The Normal Valves?
How to test the one-way valve?
Get a test report from your supplier? No
The structure of valve as below pictures
Believe not all that you see nor half what you hear,
doing is better than saying.
You may not distinguish A/B/C/D, which one is the true one-way degassing valve If only judge by the outlook or structure
The simplest way is “Vacuum the coffee bags”.
One more thing, choose the filler with no gas released such as raw coffee beans, plastic filler etc.
Here Are Some Testing Pictures For Your Reference.
The high quality one-way degassing valve, which can keep the bag vacuum in two months or more( choose the filler with no gas released ).
If you do not want to release a quality claim to your coffee bag supplier and waste your time to argue with them, test the sample by yourself or at least request a test video or picture from your supplier.
The testing method is very easy, no need of vacuum pumping equipment. Only after the heat sealing and suck the valve
The Cost Of Degassing Valve
Generally speaking, one-way degassing valve is a little expensive than the normal one.
The cost structure is “material cost+labor cost” for both valves when the quotation is provided by bag supplier.
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