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Thread: 1-Way valved coffee Bags are they sealing ?

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    1-Way valved coffee Bags are they sealing ?

    Gene Cafe Coffee Roaster $850 - Free Beans Free Freight
    Got some valved bags *a few weeks back , 2 days ago had an Idea after doing a roast and puting the beans in and sealing the bag....
    Why not suck on the One way valve and remove all the air ( o2)
    Great... seamed to work fine ....but 2-3 min later i notice that it has started to let air back in .. ok , so i recheck *the main seal and repeat process again the bag was leaking air back in . Conclusion the bag isnt sealing properly or the valve may not be working properly..
    I repeated this with all the bags i got.
    all 4 bags that i recieved leak in the same way . *Im interested to see what results everyone else gets ..
    Also this is not the result of build up off co2
    :-?

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    Re: Oe way valved coffee Bags are they sealing ?


    Yep. Some of these one-way valves are IMO two way valves in disguise.

    Did you use a vacuum cleaner to suck the air out? If so, the valves may not be designed to withstand such a forceful flow of air. :-/

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    Re: Oe way valved coffee Bags are they sealing ?

    Ive only ever noticed one bad valve.
    It was a no way valve.

    My bags come packed flat.
    Its an effort to open them right up (gusset and all) to first fill them.
    I dont understand how air would get back in, and I assume from your description, blow up the bag (even a little).
    Where would the pressure come from to force air into the bag or why would the bag try to change shape to suck air in?



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    Re: 1-Way valved coffee Bags are they sealing ?

    Id be leaning towards what cuppacoffee said. ther would have to be a force limit on it, maybe its not particularly strong. I have also considered the vaccuum cleaner thing. Might give it a go on some of my bags here and see if the same thing happens...

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    Re: 1-Way valved coffee Bags are they sealing ?

    Could it be the beans degasing? Or is it happening too quickly.

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    Re: 1-Way valved coffee Bags are they sealing ?

    ...no vaccuum cleaner just put my lips up to the valve ...
    shouldnt have any damaging results to a valve .. im thinking that the top zip typ seal
    Quote Originally Posted by 7D415C474D4C5B4E464D290 link=1238153086/2#2 date=1238156199
    Where would the pressure come from to force air into the bag or why would the bag try to change shape to suck air in?
    After sucking most of the air out the bag pulls tight over the the beans,from the lack off air in bag , the air is seaping back in through eather the valve or the top...? :-?

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    Re: 1-Way valved coffee Bags are they sealing ?

    I go through a few of these bags and havent had this issue, could be just the batch of bags. Might want to talk to the source of the bags for a new batch?

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    Re: 1-Way valved coffee Bags are they sealing ?

    Im with Moto
    It sounds like the beans degassing, there is a great difference to bags that are just sealed by hand and those sealed by a heat sealer as well.

    I have used many bags and to date have never had a bad valve.

    Mal

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    Re: 1-Way valved coffee Bags are they sealing ?

    Interesting Mick14jah (if that is your real name ;D) just performed an experiment on some bags which perform well under normal conditions and I can report the same occurrence. I dont think you can blame the bag but possibly the creating of a vacuum pulls some air out of the beans and makes the bag look like it is leaking. At the end of the day it isnt needed and I think your bags are working fine, but it is an interesting thing to see.

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    Re: 1-Way valved coffee Bags are they sealing ?

    Ive noticed the same thing, especially when re-using bags. I dont think its much of a problem, personally; we use up most of our beans well before theyre getting old and I dont think a tiny extra bit of O2 is going to make a difference (theres a lot of air between the beans etc. anyway).

    I suspect its caused by the zip-lock not being entirely air-tight. I say this because one bag we had that someone sealed using an impulse sealer didnt seem to have the same problem. Anyone with an impulse sealer confirm this (ie. TG)?

    Cheers
    Stuart.

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    Re: 1-Way valved coffee Bags are they sealing ?

    Stuart
    Correct, they are not entirely air tight but as you say, if you use the beans up relatively quickly then its not a problem.
    You can definitely see the difference when you do two roasts and fully seal one back with the impulse sealer and the other just relys on the zip-lock seal.

    Mal

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    Re: 1-Way valved coffee Bags are they sealing ?

    Quote Originally Posted by 4B46454B290 link=1238153086/10#10 date=1238217875
    Stuart
    Correct, they are not entirely air tight but as you say, if you use the beans up relatively quickly then its not a problem.
    You can definitely see the difference when you do two roasts and fully seal one back with the impulse sealer and the other just relys on the zip-lock seal.
    Yup, Ill second that. Even with top quality heavy-duty double zip bags there is an obvious difference between one that was impulse sealed and one that was merely zipped.


    Java "Full Impulse power Scotty!" phile

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    Re: 1-Way valved coffee Bags are they sealing ?

    What are these sealers worth?$$$$

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    Re: 1-Way valved coffee Bags are they sealing ?

    Quote Originally Posted by 5651504457514257444B51250 link=1238153086/9#9 date=1238215122
    Anyone with an impulse sealer confirm this (ie. TG)?
    Beaten to it it by Mal & Java.

    Quote Originally Posted by 5E5A5058020759525B330 link=1238153086/12#12 date=1238219469
    What are these sealers worth?$$$$
    You can find them on the Bay of Evils.
    Most look the same so parts should be interchangeable.

    You could also just google search and find an Australian distributor.
    From memory the price will be the same but youll probably get warranty support.

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    Super Moderator Javaphile's Avatar
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    Re: 1-Way valved coffee Bags are they sealing ?

    I picked mine up off of the bay of evil for I think it was $15 shipped. 8-) It was sold as used but looked brand new and came with extra wires and Teflon strips. :)

    They come in a variety of types and sizes with this style of hand sealer being probably the most common among home roasters and small shops.

    You can also get foot operated ones and powered ones for higher production.


    Java "Impulse buys are great! ::)" phile


  16. #16
    Mal Dimal's Avatar
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    Re: 1-Way valved coffee Bags are they sealing ?

    Ive dealt with these people "http://www.silam.com.au/" for this type of thing and have found them to be very courteous and efficient. Theres a few of these online stores so I guess you could just do a search and check them all out... :)

    Mal.

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    Re: 1-Way valved coffee Bags are they sealing ?

    Quote Originally Posted by 1F342334253D3C3930550 link=1238153086/14#14 date=1238220672
    "Impulse buys are great!"
    That was uncalled for.

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    Re: 1-Way valved coffee Bags are they sealing ?

    I use my iron, I just turn the steam off, although it doesnt seem to make any difference. It doesnt seem to leave marks on the iron, I have sealed every bag I have used this way.

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    Re: 1-Way valved coffee Bags are they sealing ?

    Quote Originally Posted by 427E6378727364717972160 link=1238153086/16#16 date=1238230066
    Quote Originally Posted by 1F342334253D3C3930550 link=1238153086/14#14 date=1238220672
    "Impulse buys are great!"
    That was uncalled for.
    ;D


    Java "My lips are sealed!" phile

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    Re: 1-Way valved coffee Bags are they sealing ?

    Quote Originally Posted by 5B7067706179787D74110 link=1238153086/18#18 date=1238230889
    "My lips are sealed!"
    You win. :-X



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