F.A.Q.’s for Heat Sealing and Vacuum Sealing

We hope the answers to the most frequently asked questions below will help you determine which Accu-Seal product is right for your specific packaging application. Please don’t hesitate to contact us with your questions. We are here to assist you in finding a solution to your heat sealing needs and support you in any way we can, before, during and after your purchase. In addition to these FAQs, be sure to answer other fundamental questions such as:

What is the product you want to package? Do you need a vacuum seal? Do you need a gas flush? Is liquid or moisture a factor in the packaging process? Is what you want to seal fragile, bulky, a powder or a medical device or instrument? What is the size of the bag you want to heat seal?

What materials can I seal with my Accu-Seal Heat Sealer?

You can seal polyethylene, polypropylene, nylon, Tyvek, craft Paper with foil lining, craft Paper with plastic lining, FEP, Aclar and foil laminates.

What materials can’t be heat sealed with my Accu-Sealer?

You cannot seal denim, vinyl, cellophane or fiberglass.

How does an impulse heat sealer work?

An impulse heater uses a temperature spike governed by time (“heat time”) followed by a cool down period (“cool time”) during which the seal jaws remain closed. This cool down period allows the molten plastic in the seal area to cool and reset under pressure providing consistent maximum seal properties. The bond that is created during the “cool time” produces a strong seal with excellent visual appearance.

Why should I vacuum seal my product?

A vacuum seal is used to prevent moisture contamination, extend shelf life and/or minimize storage space.

Why should I use Modified Atmosphere packaging (MAP) Nitrogen purge?

A MAP nitrogen purge is used to improve the shelf life of certain items, such as fresh foods or coffee. Electronics and chemicals may also benefit from this process because flushing the bag with nitrogen removes moisture and harmful vapors from the bag, decreasing product exposure to corrosion.

Why is a “clean, dry air supply” necessary?

A clean, dry air supply is necessary to maintain the Accu-Seal warranty and protect the function of the pneumatic systems within the sealer. Air that is not clean and dry can contaminate and damage vital parts of your heat sealing machine.

What is a barrier bag?

A barrier bag contains non-permeable materials such as nylon or metal foil.

Why can’t Polyethylene or Polypropylene bags hold vacuum for long-term storage?

Polyethylene and polypropylene are porous materials that allow oxygen and moisture to re-enter the bag over time.

Do all Accu-Seal Heat Sealers require an external air supply?

Yes. Accu-Seal recommends an external source capable of supplying up to 100 psi pressure to ensure sufficient sealing operation. If you intend to use vacuum as part of your sealing process, we recommend the source be capable of providing between 5 -10 SCFM flow. For recommendations relating to specific models, please contact one of our sales representatives.

Does Accu-Seal calibrate Heat Sealing machines?

Accu-Seal can arrange for the initial calibration and annual calibration of our medical heat sealing machines, Models 8000, 830, 730, 6300, 5300/5400, 6400CH and HDMP-TC. Accu-Seal uses an independent metrology company that is ISO certified for all calibrations.

How do I determine the appropriate heat and cool times to set my Accu-Seal heat sealer for the best quality seals?

To help ensure the best quality seals, Accu-Seal requests that you send sample pouch or bag materials to us for testing. Most manufacturers will provide temperatures for sealing each film, and this provides a good starting point for the heat or time. We generally recommend starting with a heat time of two seconds at 200o F and a cool time two to three times the heat time.

Have Questions?

Please contact us for general inquiries about Accu-Seal or our products. For questions about specific product needs, or spare parts, you can also use the links provided in other sections of this website.