The unidirectional degassing valve , as named as one way degassing valve , are usually hot sealed on

package , which easy produce air , C02 air , expanding gas . Like the package below : 

1.  Install on coffee bean doypack , coffee paper bags , coffee kraft box

2.  Packing on the bags of jams , like ketchup, strawberry , salad , noodle jams  

3. Pet's receipe compound bags , like pet cat , dogs , pig , and etc 

4. Bakery powder , flavour , bakery bean , snack package bags 

5. Seasoning sauce packing bags 

1. After roasting, the coffee bean or coffee powder will produce air , and can easy cause bag expansion , 

the unidirectional  valve are good for coffee beans reserve . 

2. 100% food grade PE material , is of safty and eco-friendly . 

3. Cut off air reflow , prevent the outside air into bags 

4. Keep the coffee beans fresh , prolong the period of validity