Effect of Mold Flow Channel Parameters on Gas-Assisted Extrusion of Medical Microtubules

Due to the complexity of mold flow channel parameters, they have a significant impact on medical microtubule forming quality during gas-assisted extrusion process. In this paper, influence mechanism parameters is investigated. First, multiphase model process established. Then, numerical solution presented based Polyflow finite element software. Further, size, morphology, velocity, pressure, and first normal stress difference under different are compared analyzed. Finally, experimental platform for built, correctness simulation verified by experiment. The results show that 15–5 condition, inner radius, outer wall thickness closer ideal values, better than other parameters. As ratio non-gas-assisted sections increases, gas effect becomes more intense, shrinkage microtube increases. section, radius microtubes increase then decrease, stay same near exit section. This reveals technology can effectively eliminate swelling.