The heat sealing process for large stadium membrane structures mainly involves welding high-performance membrane materials such as ETFE and PTFE. Its core is achieving a large-span, high-strength sealed connection through high-frequency heat sealing technology. The following are key points:
I. Membrane Material Types and Heat Sealing Characteristics
ETFE Membrane Material: Can adapt to curved shapes during welding (e.g., the 22,000 square meter roof of the National Speed Skating Oval, nicknamed the "Ice Ribbon").
PTFE Membrane Material: Higher heat sealing temperature and better airtightness.
Welding strength needs to reach at least 80% of the base material.
II. Advantages of High-Frequency Heat Sealing Technology
Uniform Melting: The electromagnetic field causes polar molecules (such as chlorine atoms in PVC) to generate heat through friction, avoiding localized overheating.
III. Typical Application Cases
National Speed Skating Oval: ETFE membrane material welding achieves glue-free sealing.
Beijing Daxing Airport: PVC membrane material welding.
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