Sealing Biaxially-Oriented Polyester (Mylar)

What is Biaxially-Oriented Polyester?
Also referred to as BoPET, Mylar, or Melinex; learn more about Library of Congress approved BoPET materials.

What is Sealing of Polyester?
Heat Sealing, also known as Thermal Contact Welding, or Fusion Welding, is the process of bonding plastic film using heated tools in direct or indirect contact with the plastic material. Precisely controlled time, temperature, and pressure, are used in the heat sealing process. Fusion occurs as soon as the temperature of the material exceeds the melting temperature. As soon as the desired temperature, pressure, and elapsed time is achieved, the tool is removed and the surfaces that have been joined together are allowed to cool down. As in RF Welding Vinyl and Heat Sealing of Polypropylene , the resulting weld can be as strong as the material itself. For polyester the most common process is the edge weld as seen in the image. 

Our Capabilities:
Over the last decade BCW has made investments in R&D, machinery and employee training to ensure we are producing exceptional sealed edges to make pouches, pages and envelopes from polyester films. Our staff and equipment makes us one of the most competitive manufacturers in the US. We are here to help you with your concept, design, and production needs! 

Custom Polyester Product - Minimums and Limitations:
Our equipment allows us to fold, punch and edge seal. As a policy, we do not require a minimum order. Although we can weld many thicknesses of polyester the most common thicknesses used are 2 mil, 3 mil and 4 mil. 

Examples of Custom Products:

  • Document Preservation Sleeves
  • Stamp and Envelope Covers
  • Folded Sleeves - Open on 3 Sides
  • Mylar Comic Book Bags
  • Pouches
  • Other Custom Products

To learn more about Sealing Biaxially-Oriented Polyester (Mylar) and how we can help, please call us toll free at 1-800-433-4229 and ask to speak to a custom project manager. Or, you may fill out our form and we will contact you as soon as possible. 
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