Regenerating drying bags

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reibuehl
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Regenerating drying bags

Post by reibuehl » February 29th, 2016, 4:46 am

Hi all,

Is it possible to regenerate the little drying bags that come with filament rolls? I think I read somewhere that they contain silica gel and can be dried in an oven. Is this the case and if so, what temperature and time?

Reiner
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nilrog
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Re: Regenerating drying bags

Post by nilrog » February 29th, 2016, 4:58 am

Yes, it' possible to re-use them. I used to work at a power plant where we used silica gel in large quantities to make sure that water didn't build up in some of the oil cooled transformers. And now and then we had to dry them up and re-use them. We just placed them on a tray in a regular oven and turned up the heat for a few hours, or maybe we did it over a weekend, and we just looked at them to see when they were ready as they change color. They are usually pink/blue when they are filled with moisture.

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Re: Regenerating drying bags

Post by nilrog » February 29th, 2016, 12:44 pm

Looks like ~140C in the owen is appropriate. And unless you have a lot of bags it won't take long to dry them.

(Now I just wished that I had saved all those tiny bags I've thrown away all these years...)

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Re: Regenerating drying bags

Post by nallath » March 1st, 2016, 11:02 am

I have a dehydrator (DIY beef jerky!). You should be able to use those to dry the silica.

Pretty sure you can jury rig something with a hair dryer as well.

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Re: Regenerating drying bags

Post by reibuehl » March 1st, 2016, 11:35 am

Now I am browsing Amazon for dehydrators - not for the dry bags but to make beef jerky... thanks @nallath! :lol:
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Re: Regenerating drying bags

Post by Anders Olsson » March 1st, 2016, 12:18 pm

At work, I normally dry silica gel in an oven for like 6-8 hours, or over night, at 120 C.

So, assuming the stuff in the silica gel bags that comes with the filament is the same thing as what we buy as "silica gel" for keeping things dry at work, heating it in an oven for a few hours should do the trick!

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Re: Regenerating drying bags

Post by drayson » March 1st, 2016, 2:43 pm

You dry the whole bags or do you open them up..?
Have 3 pc. of 0.5kg bags lying around...

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Re: Regenerating drying bags

Post by reibuehl » March 1st, 2016, 2:45 pm

I would dry the whole bags. If humidity can go in, it should also go out and if you dry them at a more moderate temperature, they also shouldn't get damaged.
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Re: Regenerating drying bags

Post by Amedee » March 1st, 2016, 2:51 pm

The maker is the best enemy of the housewife...

... I'm banned from the kitchen in general and from the oven in particular :roll:
Phil.

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Re: Regenerating drying bags

Post by Anders Olsson » March 1st, 2016, 8:45 pm

Amedee wrote:... I'm banned from the kitchen in general and from the oven in particular :roll:
I would not dare to use the oven at home too, for the same reason..
Luckily we have good ovens at work, which we are allowed to use for drying things :)

One has to be careful, storing plastic pellets and boron carbide powder in some of our dinner bowls was not that popular, even thought it theoretically should be risk free according to all available information :-D Moved all that stuff to work after the initial tests.

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Re: Regenerating drying bags

Post by Izzy » March 2nd, 2016, 4:02 am

There are some bigger bags on Amazon that they say a few minutes in the microwave, that way you could say I'll make a cup of coffee dear, and quickly pop them in the microwave whilst you make you both a drink :lol:
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Re: Regenerating drying bags

Post by drayson » March 2nd, 2016, 6:10 am

:-) might work, but I have no microwave - my honey banned it out of our flat.

Regarding oven, same at me but luckily she´s often at business trips. So try to dry next week (hopefully...) :-)

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Re: Regenerating drying bags

Post by LePaul » March 2nd, 2016, 9:57 am

drayson wrote::-) might work, but I have no microwave - my honey banned it out of our flat.

Regarding oven, same at me but luckily she´s often at business trips. So try to dry next week (hopefully...) :-)
Banned a microwave? Medical device reason?

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Re: Regenerating drying bags

Post by drayson » March 3rd, 2016, 3:44 am

Nope, just "this thing kills all the good thing in our meals...." reasons.
On the other way round, it´s ok so I get more healthy food than microwave lasagne :-)

But I found out that this little ovens for finalizing buns are very helpfull getting a perfect steak.
Maybe I try to dry with this as I can place it far away from direct view :-)

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Re: Regenerating drying bags

Post by nallath » March 3rd, 2016, 6:31 am

It's not just a temperature thing. You need both temperature & airflow.

This is why ovens can be used for jerky (or drying fruits) but it just doesn't work that well. Dehydrators have a lot better circulation, which dries them way better.

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