Vacuum introduction process

Vacuum introduction process

The Vacuum Infusion Process (VIP) produces high-quality, consistent parts for demanding applications.
Like other closed mold processes, VIP uses a rigid "a" side base mold, but unlike other processes, it uses thin bagging film as the "B" side or counter mold. The special reinforcement material is laid into the base mold, and then the release film or peeling layer, flow medium, nd resin and vacuum line are laid. The packaging film is sealed on the base mold. A vacuum was pulled through a port in the bagging film, using only the vacuum to pull the catalytic resin into the mold cavity.
 

This process is highly controllable because it is governed by the principle of Darcy's law, which means that there are three variables that affect the flow of the resin: the permeability of the reinforcement, the viscosity of the resin, and the pressure difference from atmospheric pressure in the cavity.

If all three variables are held constant, the infusion process will be consistent with each injection at a given site. This also provides a very accurate bill of materials for a given part, because the use of resin and glass fiber is constant. The vacuum infusion process brings all the environmental advantages of the closed mold process because the styrene emissions are minimized due to the resin curing in the closed environment. It also produces an excellent glass-to-resin ratio with almost no voids in the finished laminate.

KUKE provides resources to help manufacturers transition to VIP. As a founding member of the closed mold alliance, we can help source the required equipment and raw materials, and provide practical training to allow VIPs to work in most operations.

To view more vacuum injection videos, visit the Closure Molding Knowledge Center.