How to Seal Mylar Bags for Food Storage
Tips for Sealing Bags
How to Seal Mylar Bags for Food Storage
Types of Food Storage Sealing Options
Impulse seals are inexpensive (starting at around $30 - $100) and provide a quick seal using a pulse of energy through the seal bars. Impulse sealers only turn on when the sealing bars are lowered onto the vacuum seal rolls.
Less control that band sealers
Small Seal zone
Best for occasional use
Manual bag line up creates inconsistent seals
Direct Heat Manual Seal
Direct heat sealers maintain consistent and constant heat as long as they are turned on. This can allow for better heat penetration and better seal tack.
Best for thick materials
Cannot seal polyethylene
Industrial bags o irregular bags
Slower than band sealers
A band sealer is a semiautomatic sealing machine. Unlike a manual sealer, a band sealer contains both heating and cooling elements. The hot and cool elements combine to create strong, durable, and professional seals on your bags. These direct heat-style sealers typically have separate controls for both temperature and dwell time. A small conveyor with speed controls will pull your bag through the sealing mechanisms, and once set up, hundreds of bags can be processed at one time.
Very consistent seals seal hundreds of bags in a single use
More expensive $500+
Accessories such as date code, serial number stamping
Not ideal for sealing a few bags occasionally
Chamber Vacuum Seal
Chamber vacuum sealers can be used to seal certain types of mylar bags. These machines are different than the traditional “at home” or food-saving type vacuum sealers that are used by preppers in their home kitchen to vacuum seal bags. A chamber vacuum sealer will both vacuum out most of the air from the bag and also heat seal it at the same time.
Removes oxygen from the pouch extending shelf life.
Not compatible with all materials.
Print can get distorted when the bag is vacuum sealed.
Quality chamber sealers start at around $850.
Sealing mylar bags with an impulse sealer
Heat Sealer Heat Setting- Food Storage
The question is often asked “What temperature setting do I use to seal my bags?” This question is pretty straight forward but the answer to it can be effected by many variables. Setting your heat-sealing machine to the right temperature is only one factor. Other factors include how long heat is applied to the material (dwell), and how much pressure you apply while sealing. One temperature, Dwell, and PSI setting is not uniformly recommended for each material. For example a better seal can sometimes be obtained with a lower temperature allowed to dwell longer allowing the sealant layer polymers to fully melt together.
Temperature Setting Range
375 F - 400 F
400 F - 450 F
1 Sec - 1.5 Sec
450 F - 500 F
1.5 - 3 Sec
CareKraft (Kraft Paper)
400 F 425 F
350 F - 375 F
Factors effecting heat sealing settings to use
Type of Machine
Tips for Sealing Mylar Bags
If you’ve never sealed mylar bags before, here are some tips that can help:
Mylar Bag Sealing: FAQs
Here are a few of the questions we get a lot about sealing mylar bags for food storage. For more information, feel free to contact us directly.
Q: What thickness of seal should be used?
Impulse sealers typically offer 2mm, 5mm, or 10mm seals. While thicker is usually better, you’ll want to adjust the thickness based on the type of product and bag. A 2mm seal is usually only suitable for thin polybags, most mylar bags should have at least a 5mm seal applied to it (for prospective ¼” is about 6.35mm), a 8mm or greater seal is often required to prevent bag bursting.
Here are some typical considerations:
Matching the other seals on your bag.
Sealing the entire “top” of the bag is sometimes required.
Note: make sure that you never seal through or below the tear notch. Doing so will make your bag unable to be opened except by using scissors.
Q: Do you have to vacuum seal mylar bags for food storage?
No, you don’t.
Q: What foods cannot be stored in mylar bags?
Although most foods can be stored in mylar bags, there are some exceptions. Foods high in moisture or oil (raisins, nuts, granola, cookies, chocolate, crackers, brown rice) are not good candidates for storage in a mylar bag.
Q: Do you need a special vacuum sealer for mylar bags?
Yes, you’d need a chamber vacuum sealer. At-home food saver sealers cannot seal these mylar bags because they require the bag to have an embossed pattern to fill the air.
Q: How much heat does it take to seal a mylar bag?
It varies. You will likely need to go through a period of trial and error before determining what amount of heat is required.
Q: Do you offer custom sized beauty packaging?
Sealing bags for food storage is similar to sealing bags for retail. The key consideration includes investing in an inexpensive impulse sealer and adding oxygen absorbers, if necessary.