Ethan Clarke
Plastic containers are widely used for storing food due to their convenience and durability. However, they may develop leaks or cracks over time, which can lead to spills and messes. There are several methods to seal plastic food containers, such as vacuum sealing, induction sealing, stretch sealing, and using sealants like silicone. The chosen method depends on the type of food, the packaging material, and freshness requirements. Vacuum sealing, for example, helps preserve freshness and increase shelf life by removing air from the container, making it ideal for meats, cheeses, and other oxygen-sensitive products. Induction sealing, on the other hand, uses an electromagnetic field to heat a foil liner, creating a strong, leak-proof seal, and is commonly used for liquids and semi-liquid food products. Stretch sealing involves wrapping plastic film tightly around the product, forming a leakproof barrier, and is suitable for perishable foods like fresh meat and poultry. Sealants like silicone are versatile and effective for fixing leaks, offering flexibility and non-toxicity, making them suitable for food storage containers.
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What You'll Learn
Vacuum sealing
There are several ways to vacuum seal plastic containers at home. One option is to use a handheld vacuum sealer, such as the FoodSaver vacuum sealer. These devices work by connecting to a valve on the container and sucking the air out, creating an airtight seal. Another option is to use a vacuum sealer machine, which can be more expensive but may be more effective at removing air and creating a stronger seal.
ZWILLING offers a range of vacuum seal containers and canisters in various sizes and shapes, made from either plastic or borosilicate glass. Their containers feature innovative lids with double-sealing technology, ensuring that your food stays fresh and flavourful. The plastic containers are break-proof and lightweight, making them ideal for storing and transporting food.
When choosing a vacuum sealing method and container, it is important to consider the type of food you will be storing, the desired level of durability, and your budget. It is also crucial to ensure that the containers and sealers are compatible to create an effective airtight seal.
By using vacuum sealing, you can extend the shelf life of your food, reduce waste, and enjoy your meals as if they were freshly prepared, even if they were cooked days ago. Vacuum sealing is a convenient and practical way to improve your food storage and meal preparation experience.
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Induction sealing
The induction sealing process bonds a foil laminate inner seal to the lip of a container. After the container has been filled and capped with an induction-lined closure, it passes underneath the induction sealing system. The non-contact heating process welds the liner to the container, creating a hermetic seal. The heat, coupled with the pressure of the cap, causes the inner seal to bond to the lip of the container. The result is a leak-proof, tamper-evident seal.
When selecting an induction liner for your product, several factors must be considered, including the container's material and application. Induction liners come in one-piece or two-piece construction. The one-piece type consists of a foam-backed or paper-backed foil laminate, while the two-piece liner has an additional wax and pulp board layer. Plastic containers with continuous thread plastic caps produce the most consistent seal with the fewest challenges.
The power supply strength and sealing head design are also important considerations. The sealing head comes in two standard components: the power supply and the sealing head. The sealing head consists of a coiled conductor covered by plastic housing. The power supply energizes the inductive coil, producing an electromagnetic current. The two most common sealing head shapes are flat and tunnel heads, which disperse the magnetic field differently to achieve the desired sealing effect.
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Stretch sealing
Step 1: Prepare the Container
Start by inspecting the container for any cracks or leaks. Clean the area around the leak with a gentle dishwashing soap and warm water to remove any dirt, oil, or residue. Rinse the container and let it dry thoroughly. This step is crucial to ensure that the sealant adheres properly.
Step 2: Choose the Right Sealant
Select an appropriate sealant for plastic containers, such as silicone sealant, plastic glue, or epoxy. Silicone sealant is a versatile and flexible option that can withstand temperature changes. It is generally non-toxic and comes in food-grade varieties, making it a suitable choice for food storage containers. However, always check the product specifications for any safety concerns.
Step 3: Apply the Sealant
Follow the manufacturer's instructions for applying the sealant. If using an activator, apply it to both surfaces and allow it to dry before proceeding with the adhesive. Ensure you are working in a well-ventilated area to avoid inhaling any fumes.
Step 4: Heat the Container
Use a heat gun or a soldering iron to gently heat the area around the crack or leak. This will help melt the plastic and create a strong bond. Be cautious not to apply too much heat, as it may cause burning or further damage to the container. Work slowly and at a safe distance to avoid accidents.
Step 5: Seal the Container
Once the sealant is applied and heated, use a small amount of pressure to stretch the plastic and create a tight seal. Hold the edges together firmly until the sealant dries. This step ensures that the container is airtight and that the contents remain fresh.
Additional Tips:
- Avoid sudden temperature changes, excessive pressure, and prolonged sunlight exposure to prevent cracks or leaks in your plastic containers.
- Consider using vacuum sealing for freezer storage to prevent "freezer burn" and extend the shelf life of your perishables.
- For liquid or semi-liquid food products, induction sealing creates a strong bond and leak-proof seal.
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Silicone sealant
When selecting a silicone sealant, it is important to consider the type of plastic you are working with, as not all plastics are created equally. The manufacturer's instructions should be consulted to ensure compatibility and to understand the application techniques, delivery systems, and cure times for the specific sealant you are using.
One example of a silicone sealant product is POLYMERSHAPES 100% Silicone 10.1 oz. Clear Caulk and Sealant for Plastic Sheets GE-55. This product is moisture and fire-resistant and can be used on plastic, metal, and glass surfaces. It is non-toxic and safe for use, even with food storage containers.
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Avoiding sudden temperature changes
When it comes to plastic food containers, not all plastics are created equal. Some containers are better suited to temperature changes than others. The type of plastic and its inherent design are critical factors in determining its ability to withstand temperature changes. Containers made from polypropylene (PP #5) or high-density polyethylene (HDPE #2) are excellent choices for freezing. These plastics retain their flexibility and impact resistance even at very low temperatures, reducing the risk of cracking. On the other hand, containers made from polyethylene terephthalate (PET or PETE #1) become very brittle when frozen. Older containers made from polycarbonate (#7) can also become brittle in the freezer.
To avoid sudden temperature changes, it is important to let hot food cool to room temperature before placing it in the freezer. This gradual approach helps prevent thermal shock, which is the most common cause of cracking in plastic containers. Thermal shock occurs when a container filled with hot or very warm food is placed directly into the freezer, causing rapid and uneven contraction.
It is also important to note that the integrity of plastic can degrade over time, especially with repeated exposure to high temperatures. This degradation increases the risk of chemical leaching, which can be harmful to health. Bisphenol A (BPA) and phthalates, for example, have been linked to various health risks, including hormonal changes and reduced fertility. Therefore, it is recommended to avoid using worn or damaged plastic containers for hot food.
When choosing a plastic container, opt for high-quality, medical-grade plastic that is BPA-free and compliant with relevant health and safety standards. This ensures that no harmful chemicals will leach out during the heating process. Additionally, consider choosing containers with thicker walls and robust construction, as they can handle thermal stress better than thin, flimsy ones.
Finally, if you are concerned about the safety of using plastic containers for hot food, there are alternative options available. Glass and stainless steel are excellent choices for food storage as they do not leach chemicals and are resistant to high temperatures. These materials are also more environmentally friendly than disposable plastics, providing a long-term solution for food storage needs.
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Frequently asked questions
There are several ways to seal a plastic food container. You can use silicone sealant, which is versatile and suitable for containers that may be subjected to varying temperatures. You can also use vacuum sealing, which involves removing air from the container to preserve freshness and increase shelf life. Other methods include induction sealing, which uses an electromagnetic field to heat a foil liner that bonds to the opening of the container, and stretch sealing, which involves wrapping a plastic film tightly around the product.
The sealing method depends on the type of food, the material of the packaging, and the freshness requirements. For example, vacuum sealing works well for dense foodstuffs like meats and cheeses but may not be suitable for delicate items like fresh fruits. You should also consider the storage conditions, such as temperature, pressure, and sunlight exposure, which can affect the integrity of the seal.
Yes, some alternatives to plastic seals include aluminum lids and ultrasonic welding. Additionally, film seals can be used to cover trays of food, providing a tamper-proof and elegant solution to food packaging.
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