Home | Community | Message Board

NorthSpore.com BOOMR Bag!
This site includes paid links. Please support our sponsors.


Welcome to the Shroomery Message Board! You are experiencing a small sample of what the site has to offer. Please login or register to post messages and view our exclusive members-only content. You'll gain access to additional forums, file attachments, board customizations, encrypted private messages, and much more!

Shop: MagicBag.co Certified Organic All-In-One Grow Bags   Bridgetown Botanicals CBD Concentrates   Mushroom-Hut Substrate Bags   Left Coast Kratom Buy Kratom Extract   PhytoExtractum Kratom Powder for Sale   North Spore Bulk Substrate   Unfolding Nature Unfolding Nature: Being in the Implicate Order   Original Sensible Seeds Bulk Cannabis Seeds   Myyco.com Golden Teacher Liquid Culture For Sale   Kraken Kratom Red Vein Kratom

Jump to first unread post Pages: < Back | 1 | 2  [ show all ]
Some of these posts are very old and might contain outdated information. You may wish to search for newer posts instead.
Anonymous

Re: Technical question about filter disks [Re: Baby_Hitler]
    #1888274 - 09/06/03 11:17 AM (20 years, 6 months ago)

- Post History Deleted Upon User's Request -

Extras: Filter Print Post Top
OfflineBeers
Stranger

Registered: 05/13/03
Posts: 16
Last seen: 19 years, 15 days
Re: Technical question about filter disks [Re: ]
    #1888510 - 09/06/03 01:24 PM (20 years, 6 months ago)

<------ contam





I think medical grade Tyvek is pretty unbeatable.

Extras: Filter Print Post Top
InvisibleMrMaddHatter
Dementia praecox
 User Gallery

Registered: 06/07/02
Posts: 1,420
Loc: Everywhere
Re: Technical question about filter disks [Re: ]
    #1888569 - 09/06/03 01:55 PM (20 years, 6 months ago)

Here is some info about filter material.
LINK

Filter types

Some commonly available filters are of the following construction :

(1) Non woven polypropylene, such as Unicorn type P.
(2) Non woven polyethylene such as Tyvek,
(3) Laminates of polypropylene non woven and polypropylene membrane such as Celgard, and Unicorn type 14, and Snowpro laminates,
(4) Laminates of polypropylene non woven with PTFE such as Unicorn Type B and type T filters,
(5) PP controlled open cell foam, and such proprietary filtered bags such as bags by Mycelia of Holland, and some companies in Japan.

Non woven PP

There are a number of standard commercial production methods employing PP fiber to produce a filter material. Usually the final process is pressing an accumulated fiber bed by heat and pressure under two steel rollers. The controlled temperature and pressure and the quantity per sq. area of resin fiber will give the final pore size and uniformity. This filter is characterized by its pore size will close gradually with increase of temperature.

Tyvek and similar PE filter materials

Tyvek is a product produced by Du Pont and there are several grades of Tyvek most suitable for use as filters. The best are medical grades, however if one holds Tyvek against light one will see the unevenness of fibers . In practice a difference in thickness also is measurable. Tyvek is manufactured with HDPE, and therefore does not withstand high sterilizable temperatures. Users usually reduce sterilization temperature and increase time to compensate acceptable sterilization. Usually PE bags use Tyvek as filter material, as HDPE material is readily heat sealable on PE bags.

Polypropylene non-woven laminated with polypropylene membrane.

Celgard is a material first developed for use in battery cell separation applications. There are several grades of Celgard generally used for mushroom bag filtration use. Membrane is a material fabricated so that a thin PP film is incorporated with micron sized holes. This property is utilized to allow breathing of fungus during incubation. The laminate of this PP membrane onto a substrate to give the finished product mechanical strength and machinability. Lamination process is by heat and calendering of diamond pattern steel rollers, therefore a large percentage of Celgard is void of pores and amounts to over 50% of a give area. This reduces efficiency of filtration. Unicorn filter type 14 uses a material similar to Celgard. This material also suffers to a certain extent temperature sensitivity, that is under higher temperatures, the pores of the material closes, but much less than straight PP non woven as described above. Advantage of this material is for such mushroom specis as shiitake, so that during incubation it requires retention of Carbon Dioxide, therefore a reduced pores and low efficiency of filtration are ideal applications.


Polypropylene non woven laminated with PTFE.

PTFE is a high temperature plastic material and can be fabricated into thin membrane form with micro sized holes. These processes are well documented in numerous patents since 1970s. By laminating with polypropylene non woven this laminate can thus be heat sealed onto PP bags. Because the controlled pore size is on the PTFE, normal sterilizing heat will not reduce or increase the pore size. This laminate is most suitable for use for spawn production.

Edited by MrMaddHatter (09/06/03 02:10 PM)

Extras: Filter Print Post Top
OfflineGanoderma
journeyman
Registered: 09/04/03
Posts: 58
Last seen: 7 years, 10 months
Re: Technical question about filter disks [Re: Beers]
    #1888578 - 09/06/03 01:58 PM (20 years, 6 months ago)

i think that the filter disks are made out of the same stuff as a H.E.P.A. filter

the filter disks are cheaper when you buy them in bulk

Extras: Filter Print Post Top
InvisibleAutonomous
MysteriousStranger

Registered: 05/10/02
Posts: 901
Loc: U.S.S.A.
Re: Technical question about filter disks [Re: ]
    #1889353 - 09/06/03 07:53 PM (20 years, 6 months ago)

You can purchase Tyvek house wrap in bulk at many building supply/hardware/lumber stores. Just call around. Unfortunately when I say 'in bulk' that means enough of the material to wrap a small house. I looked into this a while back and the amount was too great and the price was too high for the little that I would use.


--------------------
"In religion and politics people's beliefs and convictions are in almost every case gotten at second-hand, and without examination."
-- Mark Twain

Extras: Filter Print Post Top
Offlineahel
ho bag

Registered: 05/23/03
Posts: 124
Last seen: 19 years, 11 months
Re: Technical question about filter disks [Re: Autonomous]
    #1889808 - 09/06/03 11:00 PM (20 years, 6 months ago)

you can get plenty of tyvek that youd ever need for free at your local post office

Extras: Filter Print Post Top
Anonymous

Re: Technical question about filter disks [Re: MrMaddHatter]
    #1890010 - 09/07/03 12:18 AM (20 years, 6 months ago)

- Post History Deleted Upon User's Request -

Extras: Filter Print Post Top
InvisibleHongosmeester
old sourdough
Male User Gallery
Registered: 12/12/02
Posts: 246
Loc: East Bay (EAST BAY GREASE...
Re: Technical question about filter disks [Re: ]
    #1890082 - 09/07/03 12:52 AM (20 years, 6 months ago)

check this out    http://www.geocities.com/amytys/Tyvek.htm
and this
http://www.pacificstatesfelt.com
I bought 30 sq.ft. for $10 with shipping
I showed some fp filters to these guys(Pacific States Felt and Manufacturing Co Inc)(pm me for the phone number) and they said that it had to have some special coating. They have an $80 minimum order for a similar product without a finish on it. :shake:


--------------------
Don't fuck with me
I'm a postal worker;-)
A zen master once said to me
don't do anything I tell you to do
so i did

<p><a href="http://www.whump.com/dropbox/other/ujname.html">Get yours</a>.</p>

<p>My <a href="http://tinyurl.com/6valr">Unitarian Jihad Name</a> is: <strong>Brother Neutron Bomb of Compassion</strong>.</p>
<p><a href="http://www.whump.com/dropbox/other/ujname.html">Get yours</a>.</p>

Extras: Filter Print Post Top
OfflineSeussA
Error: divide byzero

Folding@home Statistics
Registered: 04/27/01
Posts: 23,480
Loc: Caribbean
Last seen: 1 month, 9 days
Re: Technical question about filter disks [Re: Hongosmeester]
    #1893423 - 09/08/03 08:47 AM (20 years, 6 months ago)

> you can get plenty of tyvek that youd ever need for free at your local post office

Be careful with that recommendation... the envelope from the post office says the following:

"This packaging is the property of the U.S. Postal Service and is provided solely for use in sending Priority Mail. Misuse may be a violation of federal law."

You used to be able to get a free sample of Tyvek from DuPont by calling the number listed on the tyvek web site.


--------------------
Just another spore in the wind.

Extras: Filter Print Post Top
Offlineahel
ho bag

Registered: 05/23/03
Posts: 124
Last seen: 19 years, 11 months
Re: Technical question about filter disks [Re: Seuss]
    #1893557 - 09/08/03 09:44 AM (20 years, 6 months ago)

well of course i meant you can use it only AFTER youve sent something in it :smile:

Extras: Filter Print Post Top
Anonymous

Re: Technical question about filter disks [Re: Hongosmeester]
    #1897753 - 09/09/03 10:39 AM (20 years, 6 months ago)

- Post History Deleted Upon User's Request -

Extras: Filter Print Post Top
Offlinejahcompkilla
who

Registered: 04/17/03
Posts: 13
Last seen: 20 years, 2 months
Re: Technical question about filter disks [Re: ]
    #1903628 - 09/10/03 11:38 PM (20 years, 6 months ago)

Here are some sources for the product that I had used before

http://www.allergybegone.com/3mdisairconf.html

hope this helps

Extras: Filter Print Post Top
Offlinelysergic
Mycophile!
Registered: 06/09/03
Posts: 691
Last seen: 20 years, 3 months
Re: Technical question about filter disks [Re: jahcompkilla]
    #1905779 - 09/11/03 01:55 PM (20 years, 6 months ago)

I've never seen a filter disk, but I use autoclave paper made by 3M. The paper is actually polypropelyne that is double thick. It is designed so that instrumentation in the OR may be wrapped with it and autoclaved. The steam penetrates, but water droplets and spores/virii/baterica can't pass through it. It works wonderfully for grain jars.


--------------------
In response to an attack killing 15 American Servicemen
PsiloKitten said:
Just give em a little more time, the iraqis are making great progress. And this is unorganized. Wait till they get organized.

Extras: Filter Print Post Top
InvisibleHeruuka
member
 User Gallery
Registered: 10/15/99
Posts: 333
Re: Technical question about filter disks [Re: ]
    #1990467 - 10/08/03 03:13 PM (20 years, 5 months ago)

Tyvek is actually the industry standard vapour barrier in residential construction, at least in Canada. I work with the shit all the time when i do framing in the summer. In fact, i don't know how many of you have worked on residential developments, but there is a staggering amount of "waste" material that usually gets burned in some quiet corner of the site. A lot of the time you'll find PILES of "waste" Tyvek just lying around. If you want to take andvantage of this, just dirty yourself up a bit and ask any of the crews where the "site super" is. When you find him, ask him if you can go through his waste piles and he will almost certainly agree. You'll be amazed at what gets thrown out, on occasion i've found full roles of tyvek.

H

Extras: Filter Print Post Top
OfflineTwista
Fire it up
Male

Registered: 04/05/02
Posts: 554
Loc: Central Florida
Last seen: 6 years, 7 months
Re: Technical question about filter disks [Re: Heruuka]
    #2005046 - 10/13/03 11:34 AM (20 years, 5 months ago)

find tyvek at staples in 9"x16" envelopes. Cut off the glued flap, disconnect the folds in the envelopes breaking the glue and then cut whatever size you need. 50 envelopes go for about $15 but can easily make you 200+ filter discs.

Extras: Filter Print Post Top
Invisibleplura16
ROM3/10 SOLID

Registered: 09/24/03
Posts: 574
Loc: U.S.A.
Re: Technical question about filter disks [Re: Twista]
    #2008161 - 10/14/03 11:28 AM (20 years, 5 months ago)

not sure of the cost -- but these look killer -->

http://www.tolas.com/transfertechnology.htm

found thru maddhatters link.


--------------------

- USA -

Extras: Filter Print Post Top
OfflinemotamanM
old hand
 User Gallery
Registered: 12/18/02
Posts: 6,047
Last seen: 6 days, 9 hours
Re: Technical question about filter disks [Re: ]
    #2008778 - 10/14/03 03:53 PM (20 years, 5 months ago)

spunbonded olefin


--------------------
http://heffter.org

Extras: Filter Print Post Top
InvisibleMrMaddHatter
Dementia praecox
 User Gallery

Registered: 06/07/02
Posts: 1,420
Loc: Everywhere
Re: Technical question about filter disks [Re: plura16]
    #2008800 - 10/14/03 03:57 PM (20 years, 5 months ago)

haha cool it says
Quote:

Select materials including Tyvek?, films and foils



Tyvek.....what a wonderful material. 

They would probably not be worth the effort since autoclavable bags can be bought relatively cheap across the net, but they do look cool. Nice find :cool: 

Extras: Filter Print Post Top
Jump to top Pages: < Back | 1 | 2  [ show all ]

Shop: MagicBag.co Certified Organic All-In-One Grow Bags   Bridgetown Botanicals CBD Concentrates   Mushroom-Hut Substrate Bags   Left Coast Kratom Buy Kratom Extract   PhytoExtractum Kratom Powder for Sale   North Spore Bulk Substrate   Unfolding Nature Unfolding Nature: Being in the Implicate Order   Original Sensible Seeds Bulk Cannabis Seeds   Myyco.com Golden Teacher Liquid Culture For Sale   Kraken Kratom Red Vein Kratom


Similar ThreadsPosterViewsRepliesLast post
* Filter disk adhesive? Nyahbinghi 1,339 7 10/01/01 12:17 AM
by Larrythescaryrex
* ? about wet spot (bacillus) and filter disks Chemical_Smile 1,109 4 04/16/02 11:55 AM
by Anno
* Humidity exchange with filter disks Drummer 763 1 08/22/02 07:58 PM
by entheo_smurf
* Rye, oven bags, glove box tullycraft 5,126 12 02/11/02 08:15 AM
by cookiewhore
* Filter Disks?? What grade is needed?? kingkong 2,010 8 06/28/01 12:50 PM
by Shaw
* Tyvek suit found and ?on envelopes mycofile 1,951 10 03/08/02 05:18 AM
by KoOs
* Post deleted by Administrator Anonymous 706 2 11/07/02 03:17 AM
by SixTango
* cleaning micron magic disks downforpot 989 3 10/21/01 01:12 AM
by jonnyshaggs420

Extra information
You cannot start new topics / You cannot reply to topics
HTML is disabled / BBCode is enabled
Moderator: RogerRabbit, Pastywhyte, bodhisatta
4,952 topic views. 1 members, 2 guests and 1 web crawlers are browsing this forum.
[ Show Images Only | Sort by Score | Print Topic ]
Search this thread:

Copyright 1997-2024 Mind Media. Some rights reserved.

Generated in 0.03 seconds spending 0.01 seconds on 14 queries.