INNOVATIVE TUNNEL FOR DRYING POST-CURING RESINS FOR BOATING AND RELATED
POST-CURING Treatment features:
– In the composite material the resin acts as a matrix: it is the part that is subject to chemical transformation.
– Resin is the component that gives the fiberglass mechanical characteristics: in particular it concerns the elastic deformation, the bending strength and the interlaminar shear strength.
– In addition to the mechanical aspect, the POST-CURING is fundamental for movements of the laminate, such as shrinkage and undulations.
– A fiberglass laminate, even if hardened, has a residual polymerization percentage that varies from 15 to 35%. The polymerization is completed once the printout is exposed to the summer sun: the part that has not yet reacted will start to deform, causing visual defects such as undulations and print runs.
– If a laminate with a glass transition temperature [Tg] of 50°C is exposed to a higher temperature it will start to move and deform and, in the worst cases, it could collapse (strong flexion or deformation].
– POST-CURING is the solution: if we post-harden the laminates in the drying tunnel the Tg is decidedly increased, thus avoiding the associated risks.