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Types of Vacuum Bags and Their Pros & Cons - Argion
Vacuum sealing is becoming a game changer, mainly in food storage and preservation. However, finding the right vacuum bag type that meets your specific needs can be a daunting task. That's why this blog post is here to help you understand the types of vacuum bags, their pros and cons, and when to use each.
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Embossed or Flat Vacuum Bags?
Embossed vacuum bags, also known as channelled vacuum bags, have a unique design pattern that aids in the extraction of air during the vacuum sealing process. The embossed texture creates channels for the air to escape more efficiently, ensuring a tighter seal.
Pros: Embossed vacuum bags are perfect for heavy-duty usage and are compatible with most vacuum sealers. They also offer a great seal, thanks to the embossed texture that effectively sucks out air. Besides, embossed texture makes the bags more puncture-resistant and durable than other flat bags. They're more ideal for long-term storage of sharp or heavy items.
Cons: They can be more expensive than flat bags, and sometimes.
Flat vacuum bags are smooth and without embossed channels. They're commonly used with commercial, chamber type vacuum sealers that evacuate the air within the whole chamber.
Pros: They are usually cheaper than embossed bags, and the clear surface provides a better view of the bag's contents.
Cons: Flat vacuum bags are typically not compatible with domestic suction type vacuum sealers. They also may not vacuum as competely as embossed bags, leading to potential spoilage.
Rolls or Pre-cut Bags?
Vacuum seal rolls provide flexibility and customization. You can cut them to the exact size you need, reducing waste.
Pros: Ideal for items with unusual sizes. They are generally more cost-effective since you can customize the size.
Cons: They can be time-consuming to cut and seal, especially if you're sealing many items.
Pre-cut vacuum bags are ready for immediate use. They are handy if you frequently vacuum seal items of the same size.
Pros: Convenient and time-saving. They are excellent for standard-sized items.
Cons: They may result in waste if the item you're sealing is far smaller than the bag. They also tend to be more expensive than rolls.
Black Vacuum Bags or Aluminum Vacuum Bags?
Black vacuum bags are designed to block light and are commonly used for long-term food storage.
Pros: They help prevent light-induced degradation, which is beneficial for storing light-sensitive products, like herbs and medicines.
Cons: The dark color obscures the contents, making it hard to identify what's inside without opening the bag.
Aluminum vacuum bags offer an extra layer of protection against light, moisture, and oxygen. They're often used for long-term storage and sous vide cooking.
Pros: They provide excellent barrier properties, ensuring food stays fresher for longer.
Cons: They are typically more expensive.
Zipper Valve Vacuum Bags?
Zipper valve vacuum bags come with a built-in ziplock and a valve for vacuum sealing. They can be used with handheld vacuum sealers, or vacuum sealers with accessory function. These bags are ideal for frequent access to stored items.
Pros: They are reusable, easy to use, and great for non-food items or for foods that you need to access regularly.
Cons: They may not provide as tight a seal as other types of bags. They are also typically more expensive due to their added features.
Five-sided or Eight-sided Vacuum Bags?
Five-sided vacuum seal vacuum bags are pre-sealed on five sides, with one side left open for vacuum sealing. Their side gussets allow for greater capacity and more fillings, while the wider opening makes them easy to load with products.
Eight-sided vacuum seal vacuum bags or box bags have seals all around, making them stand upright. They offer an aesthetically pleasing and professional look, ideal for retail presentation. They are easy to fill, stand upright for easy storage, and provide a great display for products.
In conclusion, each type of vacuum bag serves a unique purpose, and your choice will depend on your needs, the nature of the items you plan to vacuum seal, your budget, and your vacuum sealer's compatibility with the bag type. Understanding these factors will help you make an informed choice. Happy vacuum sealing!
What is the science behind vacuum sealed bags over just seal...
What is the science behind vacuum sealed bags over just sealed bags?
Page 1 / 2 NextWhat is the science behind vacuum sealed bags over just sealed bags?
I understand that there is less air to hold humidity, but no one seems to worry about that with dry boxes that are oversize.
I'm assuming there is desiccant in whatever method you choose.
Thanks
Rick
This topic was modified 1 year ago by Rick Lohr Posted : 30/01/ 2:28 pmRE: What is the science behind vacuum sealed bags over just sealed bags?
You've summed it up, less air less humidity. Halve the air then there is half the water. Yes you need desiccant so what water is in there will go into that rather than the filament.
One other minor advantage of vacuum bags is that it easier to see if you have sealed it properly, if it starts relaxing after you remove the pump, it's not sealed.
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If you are thinking of get vacuum bags, make sure you get an electric pump.
Posted : 30/01/ 2:42 pmRE: What is the science behind vacuum sealed bags over just sealed bags?
I "vacuum" seal my bags by sucking the air out of the bag with my mouth. Not perfect but at least most of the ambient air is removed. I consider this to be "just sealed".
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Posted : 30/01/ 2:56 pmRE: What is the science behind vacuum sealed bags over just sealed bags?
You're technically removing some moisture that would otherwise get absorbed in the filament, but the volume of air in the bag only amounts to a small amount of moisture. It does make it clear the bag is still sealed, and they're easier to stuff in a box or shelf when they're not in big pillowy bags of air.
Posted : 30/01/ 3:27 pm EastMemphis likedRE: What is the science behind vacuum sealed bags over just sealed bags?
The absolute best thing to do would be to first vacuum out the air, then refill with a small amount of pure nitrogen. That would help keep outside air from getting into the lower pressure bag.
I just use my mouth as it's the closest vacuum pump at hand and doesn't require any time to setup or use. But I agree with your assessment.
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Posted : 30/01/ 3:54 pm Topic starter answered:RE: What is the science behind vacuum sealed bags over just sealed bags?
Thanks for the quick responses. I was wondering whether the vacuum did anything to draw moisture out of the filament but that has not been mentioned. I would think that amount of air in the bag would be trivial to humidity control. I do see value in knowing it is sealed and making it fit into the box easier.
Posted : 30/01/ 4:12 pmRE:
In order for the vacuum to draw moisture out of the filament, it has to be a high torre vacuum, and to have a heat source, typically at least 45C. Then you're really cooking. The vacuum in a bag is just less pressure than ambient. It would be difficult to draw a high vacuum in a bag and not collapse the spool.
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Posted : 30/01/ 4:17 pmRE: What is the science behind vacuum sealed bags over just sealed bags?
If you got sufficient vacuum then the vapour pressure inside the filament would be higher than that in the surrounding atmosphere so the water would migrate out to equalise the vapour pressures. But in the real world that would be impossible to achieve as the reel would likely collapse and the bag would be unlikely to be able to resist the external pressure.
Posted : 30/01/ 4:18 pmRE: What is the science behind vacuum sealed bags over just sealed bags?
The basic idea's physically sound, the numbers just don't work out to it mattering much. If ambient humidity is 50% and you vacuum down 0.2 atm, that's effectively 10% humidity. But 50% relative humidity at 25°C under 1 atm is 11.5 milligrams of water per liter. That's basically a drop of water, and 0.001% of the mass of a full 1 kg spool per liter of trapped air, if every last bit of it was absorbed. Just squeezing out the excess air will give you the vast majority of the benefit, and tossing in some dry dessicant will probably do more than trying to pull a significant vacuum on the bag. (And it'll keep working if the bag gets punctured.)
Posted : 30/01/ 5:16 pmCheerio,
Posted : 30/01/ 6:15 pm Topic starter answered:RE: What is the science behind vacuum sealed bags over just sealed bags?
Thanks for the great responses. Think I will be getting some vacuum bags, pump and dryer soon.
Rick
Posted : 30/01/ 11:21 pmRE: What is the science behind vacuum sealed bags over just sealed bags?
Posted by: @cjameshuffThe basic idea's physically sound, the numbers just don't work out to it mattering much. If ambient humidity is 50% and you vacuum down 0.2 atm, that's effectively 10% humidity. But 50% relative humidity at 25°C under 1 atm is 11.5 milligrams of water per liter. That's basically a drop of water, and 0.001% of the mass of a full 1 kg spool per liter of trapped air, if every last bit of it was absorbed. Just squeezing out the excess air will give you the vast majority of the benefit, and tossing in some dry dessicant will probably do more than trying to pull a significant vacuum on the bag. (And it'll keep working if the bag gets punctured.)
You are right of course, but the key aspect with vaccuum sealed bags is not so much that there is almost no air left and therefore no moisture in that air but that the vacuum sealed bags are very well sealed. It is the leaks that continuously bring new moisture and consume your dissicant. I could see that very well when comparing IKEA Samla boxes with their airtight sealed 365+ boxes. In the former the silical gel manages to soak up quite a lot of water over one year, in the latter the same silica bag looks almost pristine, even one year later.
Mk3s MMU2s, Voron 0.1, Voron 2.4
Posted : 31/01/ 8:16 amRE: What is the science behind vacuum sealed bags over just sealed bags?
Posted by: @thejiralPosted by: @cjameshuffThe basic idea's physically sound, the numbers just don't work out to it mattering much. If ambient humidity is 50% and you vacuum down 0.2 atm, that's effectively 10% humidity. But 50% relative humidity at 25°C under 1 atm is 11.5 milligrams of water per liter. That's basically a drop of water, and 0.001% of the mass of a full 1 kg spool per liter of trapped air, if every last bit of it was absorbed. Just squeezing out the excess air will give you the vast majority of the benefit, and tossing in some dry dessicant will probably do more than trying to pull a significant vacuum on the bag. (And it'll keep working if the bag gets punctured.)
You are right of course, but the key aspect with vaccuum sealed bags is not so much that there is almost no air left and therefore no moisture in that air but that the vacuum sealed bags are very well sealed. It is the leaks that continuously bring new moisture and consume your dissicant. I could see that very well when comparing IKEA Samla boxes with their airtight sealed 365+ boxes. In the former the silical gel manages to soak up quite a lot of water over one year, in the latter the same silica bag looks almost pristine, even one year later.
The point is that there's almost no air left and therefore no moisture even without vacuum sealing. The very example you give demonstrates this...those airtight boxes aren't evacuated. The comparison isn't to completely unsealed storage.
And again, those "very well sealed" vacuum bags can easily become unsealed if the bag gets damaged. You can put silica gel in them to mitigate this, but then you've already gotten basically all the benefit you'd get from vacuum sealing them, as well as a safety net.
Posted : 31/01/ 2:33 pmRE: What is the science behind vacuum sealed bags over just sealed bags?
Another key point to consider is that even a bag with a leak can be extremely well sealed if it has room to expand and contract with the barometric pressure. What causes a leak to be a problem? It's the "breathing" cycle of changes in atmospheric pressure that causes the gas exchange. A very small leak can defeat the vacuum but even that leak can only exchange so much moisture from diffusion alone, and as long as there's no pressure differential, even a leaky bag will not have a change in moisture level.
So vacuum sealing, while extra groovy and technically better, amounts to more work for very little gain. For me, I just chuck a large bag (40g) of desiccant into a standard gallon (or two gallon depending on the spool) Ziploc bag, suck the air out with my mouth and then put it back on the shelf.
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Posted : 31/01/ 2:39 pm cjameshuff likedRE: What is the science behind vacuum sealed bags over just sealed bags?
Posted by: @cjameshuff The point is that there's almost no air left and therefore no moisture even without vacuum sealing. The very example you give demonstrates this...those airtight boxes aren't evacuated. The comparison isn't to completely unsealed storage.And again, those "very well sealed" vacuum bags can easily become unsealed if the bag gets damaged. You can put silica gel in them to mitigate this, but then you've already gotten basically all the benefit you'd get from vacuum sealing them, as well as a safety net.
Uhm, yes, I am not sure I am getting what you are getting at here. It doesn't really matter if the containment is evacuuated or not because the amount of moisture in the given volume of enlcosed air is negligible. But if your container or bag is not sealed, moisture inside the container/bag can contiously equilibrate with the ouside and thereby there is a slow but continuous resupply of moisture which slowly consumes your dessicant.
Not sure what you are advocating here. I am actually agreeing that some well sealed containment with some dessicant is good enough for long term storage. Even not so well sealed containment like Samla boxes with dessicant works but there you may have to rejuvinate the dessicant once a year or so.
Mk3s MMU2s, Voron 0.1, Voron 2.4
Posted : 01/02/ 11:58 am EastMemphis likedRE: What is the science behind vacuum sealed bags over just sealed bags?
I'll put it this way: I strongly doubt that vacuum packaging makes any difference with regard to the moisture. But at least it is trivially easy to spot it if your bag has a leak so that you can replace it. '
Posted : 01/02/ 4:23 pm Thejiral and EastMemphis likedRE: What is the science behind vacuum sealed bags over just sealed bags?
I just ordered recently a pack of vacuum sealed bags off Amazon, which also comes with a low powered automatic pump. I really like it, though I do find the Prusament filament bags with the zipper to be of much better quality. Too bad Prusa they add a vacuum pump hole on them so we could re-use their bags to re-seal our filaments inside; would be much better for the environment instead of tossing them away. Hope they will see this comment and consider it.
Posted : 04/03/ 10:46 am Zappes likedRE: What is the science behind vacuum sealed bags over just sealed bags?
Posted by: @galshemeshI just ordered recently a pack of vacuum sealed bags off Amazon, which also comes with a low powered automatic pump. I really like it, though I do find the Prusament filament bags with the zipper to be of much better quality. Too bad Prusa they add a vacuum pump hole on them so we could re-use their bags to re-seal our filaments inside; would be much better for the environment instead of tossing them away. Hope they will see this comment and consider it.
That would be really great. They could even sell the filaments either in a resealable plastic bag with the valve or just shrink-wrapped in foil - if you already have the bag, there's no need to buy one again for the refill. Oh, and all filaments should be sold as refills - I'm drowning in empty spools and I hate the plastic waste.
Posted : 04/03/ 10:49 am galshemesh likedRE:
Exactly. Since I'm quite new I haven't run-out of my Prusament filament just yet, but yes - having empty plastic spools is not economic friendly; would very much like to be able to order only the filament without the plastic spools if I already have empty ones - this should also lower the cost. Prusa could use hard cardboard in the shape of a spool to hold the filament in place during shipping, which you can then move to your plastic spool and toss away the cardboard for recycling.
As for the plastic bags: I really saw their current bags as a total waste since it already has a nice zipper on them which you can re-use to seal other stuff in. So why not add to it a pump valve hole to make it more practicle...? I suppose that if they read this they will surely consider this, as they're making everything in-house and always evolve and improve.
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This post was modified 1 year ago by galshemesh Posted : 04/03/ 11:24 am Zappes liked Page 1 / 2 Next