Annealing is a high temperature after-treatment of an injection molded part.
morphological changes occur in Stanyl during annealing.
Stanyl is annealed when heat treated above its glass transition temperature
[Tg80°C], but below its melting temperature [Tm295°C], preferably at
temperatures between 210 and 240°C for 4 - 12 hours. The effects obtained
through annealing are irreversible. Annealing can be carried out in standard
industrial ovens. At the indicated annealing temperatures(>210°C), a nitrogen
atmosphere is recommended to avoid any thermal oxidation of the material.
Stanyl parts will anneal at lower temperatures - e.g. when operating at
continuous temperatures around 150°C,but the process will take longer. As a
planned heat treatment in a production process, the higher temperatures
mentioned above should be used.
An important practical aspect of these mechanical property improvements is
that annealed Stanyl parts can carry and transmit higher loads. For instance,
smaller gears can be designed to transmit the same torque as current larger
designs: annealing allows for miniaturization.