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Mold and Mildew

08/08/2013 3:37 PM

Dear Friends and Associates,

I've been associated with manufacturing in south-east Asia for some time, and a periodic / seasonal problem is mold and mildew on products arriving from those hot, damp climates.

While I've never been able to rule out local contamination, the problem of mold spores seem ubiquitous world wide and not so much a cleanliness issue but more an local environmental issue. Bottom line is, for that region (and I am sure others) it is impossible / impractical to simply change the conditions.

The products we purchase are in the size category of a large suitcase and smaller, usually packed in a poly bag that is generally sealed, albeit not hermetically, then packed in a corrugated carton, multiples of which are generally shipped by container to points around the world.

While just about everything is packed with a desiccant bag, that has been generally ineffective at reducing the moisture content in the poly bag to a point where mold will not propagate.

My first thought is / has been to increase the amount of desiccant in the packing, but I've no way aside from the empirical to know if it would work and how much to use, and of what type. There are lots of desiccant distributors, but no one I can find who has any specific knowledge of how I might approach this issue.

[I am aware that several years ago, specifically in the furniture industry, (vague references here) there was added a chemical in or with the desiccant that would prevent mold, but this material was subsequently outlawed because of skin reactions with the end-users.]

I have also considered flooding the poly bag at closing with some inert / safe gas that would retard or eliminate the mold growth, but not being a biochemist, I don't know where to start, or whom to ask to know if this is at all viable.

Any thoughts would be helpful, aside from the criticisms of sourcing off-shore. I have and continue to try diligently to source domestically (USA), but that has proved more difficult than I could have ever imagined ... that becomes another story at another time.

Thanks in advance for your help,

Kind regards ...

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#1

Re: Mold and Mildew

08/08/2013 3:48 PM

Sounds like an incredibly simple solution, but have they tried fogging the contents with Lysol before packaging?

If it wouldn't damage the contents, I don't think anyone in the world would have a problem with it.

http://www.lysol.com/cleaning-products/disinfectant-sprays/disinfectant-spray

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#4
In reply to #1

Re: Mold and Mildew

08/08/2013 6:23 PM

Some people have developed allergies with Lysol?

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#2

Re: Mold and Mildew

08/08/2013 4:21 PM

These people should be able to help....It will probably require some cooperation on the part of your shipper, but that seems unavoidable....

http://full-service-packaging.mil-specpkg.com/category/desiccant-absorption-bags

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#3

Re: Mold and Mildew

08/08/2013 5:36 PM

"Poly bags do NOT act as a moisture barrier, as much as a moisture filter.

You can't get a hermetic seal on a non-hermetic package.

You might look into a metalized bag to retard moisture vapor transmission through the bag.

Poly Print: Water Vapor Transmission Rate


Then, maybe less desiccant will be needed to offset the cost of the bag.

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#5

Re: Mold and Mildew

08/08/2013 6:33 PM

If your product allows a vacuum package, this is a possible way to go.

If not, replace the air by nitrogen.

We used to pack sealed vacuum food packs for the army. Look at it like the ground coffee packs in the supermarket that are vacuum packed.

Mold needs water or water vapor + oxygen to survive. Remove one item and it dies.

On the long run the vacuum pump and sealing machine will be paid back for by not having to invest in desiccant packs.

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#6

Re: Mold and Mildew

08/09/2013 9:08 AM

(1) use HEPA filtration in the work environment where the product is made/packaged. This should help reduce the number density of mold spores getting into the packages.

(2) nitrogen pack or vacuum pack is right, after a short storage in a dry chamber.

(3) change the packaging to something non-permeable to water vapor.

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#7
In reply to #6

Re: Mold and Mildew

08/09/2013 12:20 PM

Good answers. You can't overemphasize the need to store at low humidity for a while. Surface moisture can be stubborn. Once you get something good and dry, then a nice dry atmosphere of nitrogen should help. Some tool makers actually coat new tools in a wax like substance to protect the product at a higher level.

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#8
In reply to #6

Re: Mold and Mildew

08/09/2013 12:26 PM

(1) This is a south-east Asia business. Getting them to install HEPA filters AND MAINTAIN THEM would be practically impossible.

(2) How do you vacuum pack a suitcase size package without collapsing it? Nitrogen doesn't buy you much without #3.

(3) agree.

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#9
In reply to #8

Re: Mold and Mildew

08/09/2013 12:36 PM

Hi Lyn,

You've hit the proverbial nail on the head ... conditions are not always good, and except for some particular industries, there is zero climate control in the manufacturing areas. There are exceptions for high-end electronics and such where there is bona fide air conditioning (not just cold, but conditioned / regulated) in the manufacturing areas, but rarely for areas such as wood-working, injection-molding and such.

Actually, given the size of the machinery and the level of vacuum, the products I deal with could be packed thus. Sorry if I mislead you. I didn't mean the products were necessarily pliable or empty, but just "suitcase sized" as a frame of size reference.

The last is the most critical, but might be better stated as "cooperation". Good management with good intentions will do whatever is agreed upon, but very often one gets what one gets.

Kind regards ...

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#10

Re: Mold and Mildew

08/09/2013 1:04 PM

Molds and mildew both types of fungus need organic material to live off. Is the product organic in nature and how much moisture does it itself retain? Or is the organic material do to poor maintaining of a clean environment during storage? How much of the growth you see is on the product at packaging? How much mold is on the boxes that they are packaged in? The mold on these boxes interior or exterior? If the box itself is not moldy have them get rid of the bag.

Some libraries use chlorine dioxide packets to control mold and mildew on books. Suppose to be relatively safe for employees to handle. One can be shipped in the bag. You will need to test it to make sure it does no damage to the product.

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#11

Re: Mold and Mildew

08/10/2013 10:52 PM

we do know ozone at safe levels to human inhalation will stop reproduction of mold spores getting in packages, or etc.

~

a wild idea:

cheap charge with a battery-like device (even capacitor-like: acting on ultraviolet (?LED) lighting that is all/ would-be, - inexpensive enough, and - to out survive any such unwanted mold spores in the packages

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#12

Re: Mold and Mildew

08/10/2013 10:52 PM

Mold needs three things to survive:

1. Source of food.

2. Heat.

3. Moisture.

If you kill the mold, but don't remove the spores, they can come back. Mold spores are probably in the air, so after cleaning, you must dry and package quickly.

If you can spray the surfaces with a 10% bleach solution, it will kill the spores. After spraying, wipe the surface and use a soap product to get rid of the residue.

Labor is cheap, so what you need to consider is if your product will be damaged by the bleach solution. 10% is very mild, but works better than higher concentrations.

This does work and we use it all the time when mold rears it's ugly head.

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#13

Re: Mold and Mildew

08/13/2013 9:38 AM

if I'm reading this correctly, you're purchasing products and upon receipt of these products you're detecting mold. I don't see this as a problem on your end. the shipper should be the one seeking solutions!

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Autobroker (1); DCaD (1); dvmdsc (2); Fredski (1); James Stewart (1); JP76 (1); kramarat (1); lyn (2); NotUrOrdinaryJoe (1); ozzb (1); SolarEagle (1)

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