Peek injection is a special type of injection molding that produces high-quality plastic parts from polyether ether ketone (PEEK). This engineering thermoplastic has a semi-crystalline molecular structure, and its unique properties make it ideal for use in mechanical parts such as shift start discs; automotive gears, oil screens, and other mechanical components; aircraft engine parts; automatic washing machine rotors; and medical equipment. Peek has a high melting point, good chemical resistance, and excellent mechanical strength. It is also self-lubricating, can tolerate a range of sterilization techniques, and has good wear resistance.
Traditional injection molders have to modify their machines for processing PEEK because it has different properties than other polymers. The process requires precise temperature control and large gates. It also requires cleaning the mold more thoroughly than with other plastics, since PEEK will absorb any contaminants. This process also needs to be performed quickly to avoid loss and waste of material.
The main factors that influence the injection process of PEEK are the injection temperature, the injection pressure, and the injection speed. The orthogonal experiment was designed to determine which of these variables has the greatest impact on the mechanical properties of the molded parts. The experimental design used nine groups of experiments and variance analysis. The tensile test results were analyzed using a multifunctional static experimental machine.
Another factor that influences the injection process of PEEK is the amount of filler. This is important to consider because it affects the ductility and strength of the part. The most common fillers are glass, carbon, and graphite fibers, but they can be augmented with silicon dioxide or PTFE. These additives can help to lower the melt temperature, enhance the abrasion resistance and surface hardness, and reduce the friction.
It is also necessary to clean the injection machine well before a run with PEEK. This will remove any residues from previous runs. It is especially important to clean the screw and barrel of the injection machine. These are the hottest areas and can degrade other, lower melting plastics leaving dark specks on the final product. Other areas to consider cleaning are the nozzle, runner, and mold. Ideally, the injection machine should be dedicated to running only PEEK so that contamination is minimized. Keeping the injection machinery clean will save money, prevent production problems, and improve the quality of your products. This will also increase your sales and profit potential. It is possible to avoid many common injection issues by following these tips.
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