Heat Sealing

01.

What is Heat Sealing?

Heat sealing works by applying a controlled amount of heat and pressure to the surfaces of thermoplastic materials—most commonly polyethylene, polypropylene, and laminated films—causing them to melt and fuse together. Once cooled, the materials form a permanent, hermetically sealed bond.
The method is widely used in form-fill-seal (FFS) machines, impulse heat sealers, continuous band sealers, and vacuum sealing systems. These machines are common in the food packaging industry, where maintaining freshness, extending shelf life, and preventing contamination are top priorities.

Food pouch being heat sealed in a packaging machine.
Large industrial heat sealer on wheels.
02.

The Challenge: Heat, Adhesion, and Wear

One of the biggest challenges in the heat sealing process is dealing with high temperatures and sticky materials. As the sealing elements repeatedly heat and cool, melted plastic can stick to the machine's jaws or sealing bars, causing:

  • Inconsistent seals or burn marks

  • Product contamination

  • Increased machine downtime for cleaning

  • Premature wear on heating elements

To combat these issues, manufacturers rely on non-stick barrier materials—and this is where PTFE glass cloth shines.

Our Solutions

03.

What is PTFE Glass Cloth?

PTFE glass cloth is a composite material made by coating woven fiberglass fabric with polytetrafluoroethylene (PTFE)—the same substance that gives non-stick cookware its slippery surface.

This unique combination creates a fabric that is:

  • Heat-resistant up to 260°C (500°F)

  • Extremely smooth and non-stick

  • Chemically inert

  • Strong and dimensionally stable

These properties make it an ideal choice for use in heat sealing machines, especially as jaw covers, release sheets, and sealing tapes

Roll of PTFE-coated fiberglass heat sealing tape.
Heat sealing a plastic bag with an impulse sealer.
04

Choosing the Right Heat Sealing Tape Depends On:


  • Temperature Range of your heat sealer

  • Stickiness of your packaging materials (e.g., polyethylene can be messy)

  • Machine Type (impulse sealer vs. rotary band sealer)

  • Need for durability and easy replacement

Most packaging factories choose PTFE-coated fiberglass tape with silicone adhesive because it provides the best balance of performance, durability, and ease of use.

How Tapes Enhances Heat Sealing

Non-Stick Performance

During heat sealing, molten plastic often sticks to metal heating elements. PTFE’s non-stick surface prevents this adhesion, ensuring cleaner seals and eliminating the need for frequent cleaning. This not only improves seal appearance but also reduces waste caused by faulty seals.

Chemical and Moisture Resistance

The PTFE coating is resistant to nearly all chemicals, including oils, greases, solvents, and even steam. This makes the cloth ideal for sealing environments where hygiene and chemical exposure are concerns, such as food, pharmaceutical, and cleanroom packaging operations.

Heat Resistance and Thermal Stability

PTFE glass cloth is engineered to withstand continuous high temperatures without degrading. The fiberglass core gives it dimensional stability, so it doesn’t stretch or warp under pressure—crucial for maintaining uniform sealing pressure and alignment over time.

Improving Efficiency and Output

With less sticking, easier cleaning, and reduced equipment wear, manufacturers can run their heat sealers at higher speeds with more confidence—resulting in increased production output and better overall efficiency.

We are helping businesses do manufacturing with the best quality and precision.

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