Meaning
Requiring high thermal energy input and precise temperature management, high-performance thermoplastic converting converts semi-crystalline polyetheretherketone into structural components. Mastering peek processing requires barrel temperatures approaching four hundred degrees Celsius and oil-heated tools running above one hundred and sixty degrees Celsius. Inadequate tool heating causes rapid surface quenching, creating amorphous surface layers that impair chemical resistance and mechanical strength.
Injection moulders must enforce strict drying protocols to prevent hydrolytic degradation during melt plasticization. Datasheet mechanical properties depend entirely on achieving uniform crystal morphology throughout the wall thickness of the molded part.
Crystallization Dynamics
Mould temperature controls the growth and distribution of polymer crystals as the melt solidifies. Cold tools trap amorphous structures, resulting in lower tensile strength and chemical resistance. Hot tools promote high crystallinity, yielding maximum mechanical stiffness and dimensional stability under load.
Thermal Degradation
Excessive barrel residence time at high temperatures degrades polymer chains, causing discoloration and embrittlement. Degraded resin releases corrosive volatiles that attack tool steel surfaces and vent channels. Moulding machines require specialized bimetallic barrels to withstand high melt temperatures and abrasive resin grades.
Drying Requirements
Desiccant drying removes trace moisture from raw resin pellets prior to processing. Moisture levels above specified limits cause polymer chain scission during melt plasticization.
