How does VPI work?
Our plant consists of a pressure vessel, chilled storage vessel, vacuum pumps, and baking facilities. The work-pieces are preheated to a predetermined temperature in an oven and then transferred to the pressure vessel. The lid is closed and the vessel is evacuated. The valve from the storage vessel is opened and resin is admitted until the workpiece is totally immersed. The valve is then closed and the vacuum maintained for a short period. The vessel is then pressurized and held at this pressure for a predetermined time. The pressure is released, the lid is opened, and the job is transferred to the oven to complete curing. Apart from cleaning off any excess resin, the process is complete.
