Most varicose and spider veins appear in the legs due to the pressure of body weight, force of gravity, and task of carrying blood from the bottom of the body up to the heart. Compared with other veins in the body, leg veins have the toughest job of carrying blood back to the heart. They endure the most pressure.
Curing a thermosetting resin transforms it into a plastic, or elastomer by crosslinking or chain extension through the formation of covalent bonds between individual chains of the polymer. Crosslink density varies depending on the monomer or prepolymer mix, and the mechanism of crosslinking:
modular UV-curing units, variable power supply and electrodeless bulbs. However, creating UV systems to cure coatings on 3-D plastic components presented far more of a challenge. 3-D Curing Many plastic components are complex 3-D structures containing frequent undercuts that create âshadowâ areas. If UV curing was to be Figure 2 Process window