PEEK ESD Sheet

Here are extrusion processing guidances of ESD PEEK:

• 1. Drying: the granular polymer generally absorbs 0.5%w / w atmospheric moisture. In order to obtain the best effect, it should be dried until the moisture is less than 0.02%w / w. Materials may be placed in an air circulating furnace for at least 150℃ for 3 hours or at 160℃ for 2 hours. If dried in a drying box, the thickness of the raw materials in the pallet shall not exceed 25mm and prevent contamination.
• 2.Recycling: The remaining material can be recycled and injected into the pure material. It is recommended that recycled materials without fillings should not exceed 30% of the total weight, and recycled mixture with fillings should not exceed 10% of the total weight.
• 3. Thermal stability: If the equipment is stopped during the melting process, and the polymer residence time is not more than 1 hour, then there is no obvious degradation of the material at the temperature of 370℃. However, if the downtime exceeds 1 hour, the temperature of the material cylinder should be reduced to 340℃. At this temperature, the material can remain stable for several hours, and the temperature of the material cylinder must be increased when continuing processing. If the downtime exceeds 3 hours, the material cylinder should be cleaned. It can be cleaned with materials that maintain stable performance at 380℃, such as polyethersulfone or polyetherimide, or with polyethylene with low MFI.
• 4. Extruder machine: the melting point of ESD PEEK is 343℃, which can be applied to the traditional machine that can maintain the melt temperature at 360-400℃.
• 5. Cylinder capacity: Because the processing temperature of ESD PEEK polymer is very high, the residence time of the material must be as short as possible. The ideal material barrel capacity is at 2-5 times the total ejection weight.
• 6. Nozzle and lock system: The melting point of the polymer is very high. If the temperature drops below 343℃, the melt will solidify quickly. Therefore, it is necessary to install a large enough heater in the nozzle to prevent the cooling of "extrusion mold cooling".
• 7. Screw: The minimum value of the screw length ratio L / D is 16:1, but the L / D ratio between 18:1 and 24:1 should be preferred.
• 8. Extrusion pressure: the general injection pressure of 8-20 MPa.
• 9. Extruding speed: medium speed.
• 10. Screw speed: the general screw speed is 10-20rpm. For the reinforcement level, it is recommended to use a lower screw speed.