Mechanism of Food Preservation by a Vacuum Sealer

Mechanism of Food Preservation

A vacuum sealer is what the name implies– an apparatus that vacuums and seals with your stuff in it. In a plastic bag. Let’s get a few things clear here –


Technically, vacuum means just absence of air. Space is a good example of vacuum – the space is actually the model that the vacuum sealer is designed after. But a vacuum sealer doesn’t really create outer space in one of your plastic bags.

So, how does it works?

When you vacuum package something like vacuum packing for food preservation, the food is kept inside a plastic bag and the air is sucked out mechanically. No air means there’s no oxygen which ensures no oxidizing and the food is preserved in pristine condition. This helps to protect whatever you put inside be that food or some document you need storing for a long time.

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The seals are the doorway to food inside. A vacuum sealer seals the plastic bag by melting its topmost part severing any connections with outside. The vacuum sealer vacuums the bag and seals it instantly. The plastic bags need to be made especially for heat-sealing or it may end up making a mess. These bags are specially made to withstand cooking or microwaving.

Know about other advantages.


Chamber unit represents special vacuuming types that are used in household vacuum sealers for smaller use. A vacuum pump is used whereas the non-chamber vacuum uses a vacuum channel. If you’re thinking of vacuum sealing liquid, you’ll need a chamber type vacuum. The bags for this are also special so be careful not to mix them up.


The non-chamber units are used in commercial spaces mostly. Non-chamber type vacuum sealers are unable to seal liquid- even moist items like meat or fish should be frozen before vacuum sealed.

Modes: Automatic or Manual

In Manual mode, the user has to switch from vacuuming to sealing on his own. In automatic mode, it is done without outside interruption.

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How does Vacuum Sealers Work?

Vacuum sealers work with two steps. Vacuuming and sealing.

In the vacuuming part, if you’re vacuuming packing for food preservation, then put your food inside your bag. Keep it as far as possible from the top of the bag. If any of your food pickings are in the area where sealing shall be done, then your seal may weaken and the airtight bag will not be airtight for long. The top part can be folded for a little bit for good sealing. Then you put your bag inside the vacuum sealing machine.

In the vacuumed sealing machine, you’d see a sealing chamber, put your bag inside the chamber. If there’s any part of your bag out of your chamber, then vacuuming will fail when the pressure is lowered inside the machine.

After the bag is emptied completely the heat sealing will begin instantly. If there’s a time lag between two steps, then air will rush into the bag and vacuum sealing would fail. For your usual bags, it will require two to three seconds to seal the bag. The bar that seals the bag will be hot as long as it needs to seal the bag. If you’re using a thicker or thinner bag, adjust your vacuum sealer accordingly.

After that, your vacuum sealed bag will be ready to be stored.

Read this maintenance guide to know about the comprehensive guide to cleaning and maintaining your vacuum sealer.

Still questions? Skim through the FAQs.

Roja D’Costa
Hi there, it’s Roja D'Costa. I have been crazy about food for a very long time. I think from this, I got my passion for cooking. Cooking is my everything if I describe myself in a word. We all know that kitchen appliances play a great role in good cooking, That’s why I decided to give reviews about kitchen appliances. My reviews will not only help you to find the best kitchen appliance but also will help you to maintain the quality of your dish and most importantly it’s Taste. So brace yourself and be ready to explore what’s best for you. Happy Cooking!