The design of water-assisted injection molding equipment must meet the conditions similar to gas-assisted injection molding. This is because most process technologies are based on gas-assisted injection molding. However, water-assisted injection molding also has its own characteristics. From the point of view of plastic parts, except that the drainage is more complicated than the removal of nitrogen gas, it is necessary to complete the “drainage” of the plastic parts by gravity and the introduction of compressed gas. To prevent corrosion, water must not come into contact with the mold surface.

Water-assisted injection molding requires extremely high water injection capacity to ensure uniform wall thickness distribution and high surface quality. For this reason, suitable pressure control mode. The water supply operates at an extremely high flow rate and can reach a pressure of 350 bar. In order to inject water into the melt, an injection assembly with a larger cross-sectional area than gas-assisted injection must be used, which is essential for water to penetrate into the melt at a sufficient speed.