Whenever you need to store perishable products safely for the long term or package items that will be used repeatedly in the same packaging, mylar bags are one of the best packaging solutions. They provide safe storage even when products are in direct contact with the packaging and help prevent contamination. That is why brands use these flexible pouches to package spices, supplements, flour, tea, coffee, gummies, cookies, and many other food items.

Did you know that once you open a mylar pouch to use the product, you can reseal it at home using a clothes iron? With this simple trick, you can protect your products from contamination and safely store them in your kitchen. Let's learn in detail how to seal mylar bags for food storage with this simple step-by-step guide.

Mylar Bag Sealing Equipment Checklist

Before resealing the mylar bag of any product you have purchased, you should first arrange the following equipment:

• The mylar bag that you want to reseal.
• A table or flat surface where you will place the die cut mylar bags, such as an ironing board, kitchen table, or any other flat surface.
• An automatic or manual clothes iron. You cannot use a steam iron.
• A permanent marker that you can use to write the storage temperature, the packaging date of the mylar bag, and the name of the product.
• Scissors for cutting the extra edges of the mylar bag so that it can be sealed properly.

By using these methods, you can heat seal mylar bags in a proper way to repack your products.

How Do You Seal Mylar Bags In a Professional Way: Complete Guide

In the following sections, we will guide you through a few easy steps on how you can use a clothes iron to ensure your mylar bags are properly sealed.

Prepare Everything Before Starting the Sealing of Mylar Bags

First of all, along with the equipment mentioned above, you should also arrange a flat board. Make sure that none of the equipment has any errors or technical issues, as this can affect your heat sealing mylar bag experience.

Mylar bag sealing temperature

When sealing mylar bags with a clothes iron, the first step is to set the correct sealing temperature. During this process, you should adjust the iron's temperature according to the thickness of your mylar bag. You can also set the iron to a medium heat setting and test it on a small strip first. This will help you seal your mylar packaging properly.

However, the standard temperature used is approximately 160–170°C (320–338°F) for 3.5 mil mylar bags and 190–220°C (374–429°F) for 7 mil bags.

Fill the Bags with Products

First, you should fill the bag with the desired amount of product, or use the bag that you want to repack. Leave about 20% of the bag empty and do not overfill it. If needed, you can also add an oxygen absorber to help keep your product safe from even a small amount of moisture.

Once the contents have been added to the heat seal mylar bag, you should align both top sides of the bag properly with each other. Then, place the bag on a flat surface and heat seal it.

Iron the Mylar Bag

After placing the bag properly on a flat surface and checking that the iron is set to the correct temperature, you can start heat sealing the mylar bag according to its thickness. During this process, move the iron slowly over the top edge of the bag using a medium heat setting. However, do not move the iron too slowly, as it may burn the bag.

If the mylar bag is thinner, passing the iron over one side may be enough to create a proper seal. If the bag is thicker, you may need to pass the iron over both sides. This way, you can seal your mylar bags properly.

Inspect the Seal of Your Mylar Bags

After placing the bag properly on a flat surface and checking that the iron is set to the correct temperature, you can start heat sealing the mylar bag according to its thickness. During this process, move the iron slowly over the top edge of the bag using a medium heat setting. However, do not move the iron too slowly, as it may burn the bag.

If the mylar bag is thinner, passing the iron over one side may be enough to create a proper seal. If the bag is thicker, you may need to pass the iron over both sides. This way, you can seal your Mylar bags properly.

Besides this method, you can also use a mylar bag sealer at home to seal your bags properly by setting the appropriate mylar sealing temperature.

Situations Where Iron Sealing Works Best

Besides this, there are many situations in which you can use iron sealing to seal even your damaged mylar bags.

• If the zipper on your zip lock mylar bag is damaged or keeps getting stuck when opening or closing it, instead of getting frustrated, you should heat seal it. First, cut off the zipper in a straight line, and then seal the remaining sides of the bag using the method explained above.
• If your bag has a tear notch design and, after opening it, you want to safely repack the product again, you can also use iron sealing for this purpose.

You can also use this method for dual compartment mylar bags to prevent the zero oxygen transmission and contamination of your products.

Benefits of Heat Sealing Mylar Bags

Whenever you properly pack your products inside heat-sealed mylar bags, you can get many benefits.

Prevent Exposure to Oxygen

When products remain in contact with oxygen for a long time, they begin to lose their quality. By using mylar packaging bags, you can protect your products from direct contact with oxygen, preventing the reaction between oxygen and moisture that can contaminate your product. These bags create a vacuum-like environment to keep your product safe for a longer period while maintaining its original quality.

Prevent Damage Due to Humidity and Moisture

Because of their airtight storage, heat sealed mylar bags maintain a suitable environment for your products so they can preserve their quality. Exposure to moisture and humidity can make products soggy, and after a few days, any product may lose its original condition and chemical composition. That is why it is important to ensure that your resealable mylar bags are sealed properly and securely.

Prevent Damage Due to Direct Sunlight

Direct sunlight can make your products become excessively dry, and UV rays can also affect your products by degrading their quality. By using heat sealed mylar food storage bags, you can prevent UV light from reaching your products, allowing them to maintain their original benefits for a longer time for end consumers.

Prevent Products from the Reach of Children

If you have high-potency products, these bags also help keep them out of the reach of children because they cannot be opened easily. This allows you to keep your products safe from children and pets, helping prevent accidental intake.

Food stays safe for 25-30 Years

In this iron sealing method, your bags work best to save the quality of food items as compared to the custom mylar vacuum seal bags. If you want to know how food stays longer in mylar bags after the proper sealing, stay tuned with us. When you properly seal mylar bags with a clothes iron, they prevent the product from exposure to moisture, dust, oxygen, light, and other harmful factors. In this case, you can keep your products safe from damage for up to 25 or 30 years.

Where You Can Purchase Custom Heat Seal Mylar Bags

If you are looking for a packaging company that can produce custom-designed heat seal mylar bags according to your requirements with the best quality at affordable prices, your search ends at Custom Boxes Deals. We provide our clients with every type of packaging solution, from rigid containers to flexible pouch packaging, along with the best buying experience.

With us, you can enjoy a wide range of packaging services with every order, such as free shipping, free design support, a fast turnaround time of 6–8 business days, and bulk discounts.

Conclusion

Learning how to seal mylar bags with a clothes iron helps you reseal perishable products on time and protect them from contamination. With this method, regardless of the type of locking mechanism, you can properly reseal all types of flexible packaging, including mylar shipping bags.

If you need any assistance or want to purchase custom mylar bags in any style, contact our customer support team. They are available 24/7 to help you.