Peek injection is a process of injecting a viscous fluid into a cavity. The fluid helps to prevent the cracking of the material during the injection. It also improves the mechanical properties of the material. This process is used in high-precision manufacturing applications. It is also useful for producing parts with complex shapes, as it helps reduce warping and shrinkage during cooling. This is a critical factor in maintaining the integrity of the final product.
Polyether ether ketone (PEEK) is a special engineering plastic with excellent comprehensive performance, including thermal stability and mechanical strength. It is often used in place of metals in various special fields, especially aerospace, automotive industry, medical equipment and semiconductors. Unlike traditional materials, PEEK is resistant to corrosion and can be mass-produced using injection molding without requiring metal machining or thermoset curing, which cuts down on processing steps and saves time and money.
PEEK can be molded in standard injection machines, but it is crucial to ensure proper process temperatures are maintained during production. PEEK is sensitive to overheating, and if this happens during injection molding, the mechanical properties of the finished product may be compromised. PEEK is available in a wide range of grades, each designed for a specific set of properties and applications. There are even electrostatically dissipative, metallurgical and x-ray detectable varieties of PEEK designed to meet the needs of specific industries or end-users.
The high injection pressure used in the injection process causes silver streaks near the nozzle, which is not a good condition for ensuring the quality of PEEK injection molded products. To avoid this problem, the injection temperature, injection pressure and injection speed should be controlled correctly. In addition, the resin mould should be cooled quickly after injection to prevent silver streaks.
Another issue is the low melt flow of PEEK during injection, which results in uneven product surfaces. It is important to use the correct viscosity of the injection compound to ensure even distribution. Moreover, the injection temperature should be moderate so that the material can be injected smoothly and the molding effect is good.
If the injection pressure is too high, the nozzle will easily break and cause the failure of the plasticized product. In addition, the excessive pressure can lead to an overflow of the material and cause the abrasion of the surface of the molded product. Therefore, it is necessary to optimize the injection process parameters of the PEEK to solve these problems.
The optimum injection process parameters of the PEEK are found by conducting an orthogonal experiment, and the mechanical experiments are carried out on these samples. The results show that the injection process parameters have a great impact on the mechanical properties of the PEEK injection molded products. If the injection process parameters are optimized, the mechanical properties of the PEEK products will be improved significantly. The research on the peek injection is still ongoing, and more tests will be conducted in order to achieve the best results.