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wood chip
Stranger

Registered: 02/22/09
Posts: 210
Last seen: 10 years, 3 months
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bag behavior during cook
#19179311 - 11/23/13 03:03 PM (10 years, 3 months ago) |
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When comparing pasteurization to sterilization at pressure do the bags seal differently once cooled?
When I pressure cook bags, I do not use tyvek because when I pull the bags out of the cooker they are effectively sealed. I use grain spawn and inoculate in front of a flow hood where I peel the bags open and inoculate. I have never had any bags contaminate.
Is this not the case when pasteurizing for at 100C for 8 hours? RR advocates tyvek but is this because he does not use pressure sterilization and the bags are not as tightly sealed after cooling.
RR did you switch to tyvek due to a problem with contamination in the past?
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Forrester
aspiring sociopath


Registered: 02/05/13
Posts: 9,351
Loc: Northeast USA
Last seen: 1 month, 19 days
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Re: bag behavior during cook [Re: wood chip]
#19179891 - 11/23/13 05:57 PM (10 years, 3 months ago) |
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Quote:
wood chip said: Is this not the case when pasteurizing for at 100C for 8 hours? RR advocates tyvek but is this because he does not use pressure sterilization and the bags are not as tightly sealed after cooling.
RR did you switch to tyvek due to a problem with contamination in the past?
Someone will correct me if I'm wrong but I'm fairly sure 100C for 8 hours is considered sterilization, not pasteurization.
What I don't understand is how are your bags getting sealed? Are you sealing them before you put them in the PC? Just running bags in a PC doesn't seal them, at least the couple bags I've run, but I'm not an expert and haven't done a whole lot of PC'ing bags just yet...
-------------------- Repugnant is a creature who would squander the ability to lift an eye to heaven, conscious of his fleeting time here. ------------------- Have some medicinal mushrooms and want to get the most out of them? Try this double extraction method.
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RogerRabbit
Bans for Pleasure



Registered: 03/26/03
Posts: 42,214
Loc: Seattle
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Re: bag behavior during cook [Re: wood chip]
#19180246 - 11/23/13 07:38 PM (10 years, 3 months ago) |
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The tyvek ensures the gasses can vent during the sterilization process, even if bags are stacked on top of each other. Without tyvek, some people have bags burst because they can't vent.
Forrester, the bags pull a vacuum on their own as they cool as long as the plastic is sealed against itself. Another benefit to tyvek, even though the bags do pull a vacuum is because it makes it easier to open the bag. By grabbing the sleeve and pulling it out in front of the flow hood, the bag opens easily without getting my fingers in between the bag and flowhood. RR
-------------------- Download Let's Grow Mushrooms semper in excretia sumus solim profundum variat "I've never had a failed experiment. I've only discovered 10,000 methods which do not work." Thomas Edison
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Forrester
aspiring sociopath


Registered: 02/05/13
Posts: 9,351
Loc: Northeast USA
Last seen: 1 month, 19 days
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Re: bag behavior during cook [Re: RogerRabbit]
#19180262 - 11/23/13 07:43 PM (10 years, 3 months ago) |
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Hey thanks, that explains the tyvek thing I've failed to understand for all this time
-------------------- Repugnant is a creature who would squander the ability to lift an eye to heaven, conscious of his fleeting time here. ------------------- Have some medicinal mushrooms and want to get the most out of them? Try this double extraction method.
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