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Fundamentals concerning plastics
Welding temperature
Welding temperature
Influence of the welding temperature
The length of the molecular chains has a strong influence on the weldability. Therefore, the different chain lengths should be as equal as possible in order to achieve homogeneous flowing properties.
If there are very high molecular weights, as with PE 100, an ultra high-molecular polyethylene (PE- HD-UHMW), the chain reaches such a length that the molecular chains in thermoplastic state cannot slide down anymore because of the many entanglements with other molecular chains. This means that the material indeed softens when heated but it is no longer capable of flow and therefore not well weldable.
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