Dissolution of gas into liquid resins during compression moulding

During compression moulding of sheet moulding compounds air bubbles are formed that can deteriorate several properties of the final composite. The story of such bubbles is directly set by the local pressure distribution during pressing. This pressure can be found from experiments or numerical simulations but it is however also necessarily to derive criteria for the motion of the bubbles as well as relationships for the dissolution rate of the gas enclosed in the bubbles. In order to full-fill the latter a number of experiments have been performed. The results follow neatly Henry's law up to a pressure of 6 bar and the rate of dissolution is very much dependent of the type of gas studied. When applying the results to the process in focus it is found that even very large bubbles can be dissolved into the liquid resin during manufacturing.Godkänd; 2008; Bibliografisk uppgift: CD-ROM; 20080828 (ysko