Ethan Clarke
Vacuum sealing is a popular method for preserving food and ensuring its freshness. It involves removing air from a container to create an airtight seal. While it is a safe method for preserving dry goods, dehydrated foods, and shelf-stable items, it is not suitable for fresh or cooked foods. Vacuum sealing can be achieved using various methods and tools, such as handheld sealers, vacuum chambers, or even microwave heat. However, it is important to exercise caution when vacuum sealing to avoid damaging containers or creating an insufficient seal.
| Characteristics | Values |
|---|---|
| Plastic containers with softer lids | Can be vacuum-sealed unintentionally by microwaving |
| Plastic containers with harder lids | May crack or implode under too much vacuum |
| Plastic containers without a vacuum valve | Not meant to withstand vacuum forces; may damage or leak air |
| Plastic lids | Cannot be vacuum-sealed due to lack of rubber seal |
| Glass jars | Can be vacuum-sealed using a pump or electric sealer |
| Vacuum sealing benefits | Preserves food, locks in freshness and flavour, saves space |
| Vacuum sealing food types | Dehydrated foods, dry goods, freeze-dried foods, spices |
| Foods to avoid vacuum sealing | Sugar, fresh or cooked foods |
| Vacuum sealing process | Remove air from the container, creating an airtight seal |
| Vacuum seal indication | Vacuum indicator dimples inwards |
| Vacuum release methods | Increase temperature of contents, leave at room temperature, use hot water |
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What You'll Learn
Use a vacuum chamber
Using a vacuum chamber to seal a plastic container is a more complex process than using a vacuum sealing machine. Vacuum chambers are typically used for sealing liquids or large items, and they can also be used to seal plastic containers. Here is a step-by-step guide on how to use a vacuum chamber to seal a plastic container:
First, it is essential to use the correct type of plastic container. Regular plastic containers are not designed to withstand vacuum forces, so using a container with a softer lid that seals like a traditional container is recommended. Glass containers are also an option, as they can withstand higher vacuum forces.
Next, prepare the vacuum chamber by ensuring that it has a vacuum valve built into it. This will allow you to control the vacuum process and seal the container effectively. Place the items you want to seal inside the plastic container and put the container inside the vacuum chamber. Close the lid of the chamber and activate the vacuum pump to start removing the air.
Once the air has been sufficiently removed, you can seal the plastic container. This can be done by using gloves or magnets to put the lid on the container while it is still under vacuum. Make sure the lid is secure and properly sealed. Then, release the vacuum in the chamber and remove your sealed plastic container.
It is important to note that applying too much vacuum force can damage the container or the lid, so it is crucial to monitor the process carefully. Additionally, when sealing food items, be aware of the potential for anaerobic bacteria to proliferate in an oxygen-depleted environment, which can cause food safety issues.
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Avoid plastic lids
Vacuum sealing is a versatile home storage solution. It helps prevent freezer burn on frozen foods, helps keep shelf-stable ingredients like grains last longer, and makes cooking sous vide more effective. If you are looking to vacuum seal a plastic container, you can follow the steps below to avoid using plastic lids:
Use a zip-top plastic freezer bag and a bowl of water:
- Place the food you want to vacuum seal in a zip-top plastic freezer bag.
- Press out as much air as possible with your hands and press the seal almost closed. Leave a little corner of the top unsealed.
- Holding the bag by the unsealed corner, lower it into the water.
- Use your other hand to press out any air bubbles that might be trapped with the food.
- Once you reach the unsealed corner, press the seal closed.
- When you lift the bag out of the water, the sides of the plastic should be moulded to the food.
Use a vacuum sealer:
- Place one side of the plastic sheets into the vacuum sealer and press the "Seal Only" button to heat seal the sheets' edges together.
- Repeat the process to create heat seals on three sides, leaving one side open.
- Lock the bag into the sealer and press the vacuum seal button.
- Open the sealer lid, position the bag's opening at the vacuum mouth, then close the sealer lid.
- Listen for a click that indicates it's locked.
- Press the "Vacuum Seal" button to activate the appliance and compress the bag.
Use a plastic straw:
- Place the item you're storing in a ziplock bag, then put a straw into the bag.
- Seal the bag, leaving only room for the straw to protrude from the opening.
- Suck the air out of the bag through the straw.
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Use a handheld sealer
Vacuum sealing is a versatile home storage solution for food preservation and packing. To vacuum seal a plastic container using a handheld sealer, follow these steps:
First, ensure you have a suitable handheld sealer. Some vacuum sealers are designed specifically for use with certain containers, so check that your sealer is compatible with the plastic container you intend to use. For example, the FoodSaver vacuum sealer requires a separate handheld sealer attachment, which can be purchased separately.
Next, prepare your container. Choose a container size that is suitable for the amount of food you wish to store. It is recommended to use a container that is slightly larger than the volume of food to minimize the amount of air that needs to be removed. Place the food inside the container, ensuring it is clean and dry.
Now, you can begin the sealing process. Turn the valve on the container to vacuum mode. Connect your handheld sealer to the valve, following the manufacturer's instructions. Some sealers may require an additional hose attachment to reach the valve. Once the sealer is connected, activate it according to the instructions. The sealer will begin to remove the air from the container, creating a vacuum.
Finally, when the air has been sufficiently removed, the sealer will typically indicate that it is done, either through an automatic shut-off or a notification. Detach the sealer from the container, and close the valve to ensure the vacuum seal is maintained. Your food is now vacuum-sealed and can be stored according to its type and your preferences.
Using a handheld sealer with a plastic container is a convenient way to achieve the benefits of vacuum sealing without requiring a full-size vacuum sealing machine.
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Heat the contents
To vacuum seal a plastic container, you will need to heat its contents. This process involves raising the temperature of the food inside the container, causing it to expand and create pressure. This pressure will force the lid to release, allowing you to open the container.
There are a few methods to heat the contents of your plastic container and create the necessary vacuum seal. One approach is to use hot water. First, find a pot that is larger than the lid of your container. Fill this pot with water and place it on the stove to boil. Once the water has reached a rolling boil, remove it from the heat and allow it to cool slightly. It is important to ensure that the water is no longer boiling or steaming vigorously, as you do not want to risk burning yourself.
The next step is to carefully invert your container and submerge only the lid in the hot water. You will need to hold it in place or use a utensil to keep it submerged for a couple of minutes. As the hot water heats the contents of the container, you will feel the pressure release and the vacuum seal will be broken. This method is effective because the expanding air inside the container pushes against the lid, causing it to pop open.
Another approach to heating the contents is to use an oven mitt. This method is safer if you are concerned about hot steam rising from the water. Simply wear an oven mitt to protect your hand and hold the container over the hot water, allowing the steam to heat the contents. Again, ensure that the water is not actively boiling or steaming to avoid burns. You can also use the oven mitt to pry the lid off once the seal has released, as the hot water will have loosened the vacuum seal.
It is worth noting that vacuum sealing is not suitable for all types of food. While it is perfect for dry goods, dehydrated foods, spices, and shelf-stable items like rice, beans, and flour, it should not be used for fresh or cooked foods. Additionally, avoid vacuum sealing sugar or brown sugar, as it will turn into a solid brick and become difficult to remove from the jar. Always prioritize food safety and proper storage methods to maintain the quality and freshness of your items.
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Use a glove or waldo
When using a vacuum chamber to seal a plastic container, you can use a glove or waldo built into the side of the chamber to put the lids on once the vacuum is applied. This is a safer alternative to gambling on pressure changes to seal the container. You can also use magnets for this purpose.
The glove or waldo allows you to seal the tupperware after pulling a vacuum, unseal it when you want to open it, and prevents the package from collapsing due to vacuum pressure.
It is important to note that regular plastic containers are not designed to withstand vacuum forces, so there is a risk of damaging the container or having air leak in, reducing the shelf life.
Using a glove or waldo, you can carefully control the vacuum sealing process and ensure that the plastic container is not damaged in the process. This method provides a more controlled and precise way of vacuum sealing, allowing you to maintain the integrity of the container and its contents.
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Frequently asked questions
No, the container must be airtight. Plastic containers without valves are not meant to withstand vacuum forces, and may crack or implode.
You can use a handheld sealer, such as the FoodSaver FM1510 Fresh Food Preservation System, which is compatible with vacuum seal food storage containers.
Vacuum sealing is a safe method of preserving dry goods, dehydrated foods, freeze-dried foods, and spices. It is not suitable for fresh or cooked foods, or for sugar or brown sugar.
There are several ways to open a vacuum-sealed container. One way is to increase the temperature of the contents by placing the container in hot water, causing the contents to expand and the pressure to release. Alternatively, you can leave the container at room temperature for one to two weeks, allowing the food to spoil and the air inside to expand.
