Material Drying
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Storage Management of PA12 Factory Pre-dried Packaging
Fenómeno del problema
【Problem phenomenon】It was believed that PA12 could be used directly after opening the bag, but some batches of products showed bubbles and silver streaks, with unstable quality
Análisis de la causa
PA12 such as Grilamid has been pre-dried and sealed in packaging before leaving the factory, and does not need re-drying if stored properly; however, when the packaging bag is damaged, dampened, or exposed for a long time after opening, the moisture content of the surface pellets can exceed the 0.1% critical value, and direct processing immediately produces defects
Solución
Well-sealed bagged material can be used directly after temperature equalization; damaged bags and dampened material should be re-dried at 80℃×6-16h by vacuum or convection drying; leftover material after opening the bag should be immediately transferred to a sealed metal container to minimize the air volume
Conclusión clave
PA12 pre-dried packaging is the starting point of quality, and damaged or dampened material must be re-dried before going online; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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