The injection molding process for PEEK (Polyetheretherketone) involves melting the polymer and injecting it into a mold to produce a desired shape. The specific injection molding conditions for PEEK can vary based on factors such as the grade of PEEK, the part design, and the injection molding machine. However, here are some general guidelines for the injection molding of PEEK:
Temperature:
Barrel Temperature: 370°C to 400°C (698°F to 752°F)
Mold Temperature: 120°C to 180°C (248°F to 356°F)
Injection Pressure:
Injection pressure for PEEK is typically high, ranging from 100 MPa to 200 MPa (14,500 psi to 29,000 psi).
Injection Speed:
Higher injection speeds are often used for PEEK, but the specific speed will depend on the part design and mold configuration.
Injection Time:
Injection time is influenced by the part size, thickness, and the material's flow characteristics. It can range from a few seconds to several seconds.
Holding Pressure and Time:
PEEK requires a holding pressure to pack the material into the mold cavity fully. Holding pressure is typically maintained for a specific period to ensure proper part formation.
Cooling Time:
Cooling time is influenced by the thickness of the part. PEEK should be given adequate time to cool and solidify within the mold to prevent deformation.
Back Pressure:
Back pressure is applied to the screw during the injection molding process to improve the homogeneity of the melted PEEK and eliminate any voids.
It's important to note that these are general guidelines, and the optimal parameters can vary depending on the specific grade of PEEK, the mold design, and the equipment being used. Always refer to the material data sheet provided by the PEEK manufacturer for recommended processing conditions.