1. Understanding the principle of hot air for thermoplastic welding

Hot-air welding allows the polymer to soften to such an extent that, in the presence of another compatible polymer in the same state, the two surfaces subjected to pressure come to marry or bond.

It is therefore important that the two materials involved are compatible with each other. They must have the same :

• surface tension,

• melting point or type of fusion.

The welding parameters are :

• temperature,

• air flow,

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