Summary
The thickening behavior of SMC varies with formulation and operating conditions. During the SMC compounding process, alkaline oxides such as MgO, Mg(OH)2, CaO, Ca(OH)2 are added to the formulation to yield the viscosity build-up from a flowable paste to a semi-solid sheet. The thickening curve of SMC can be divided into three stages: 1. The initial thickening period for the wetting process, 2. The middle thickening rate period for viscosity increasing, 3. The final viscosity period for the molding process. By means of factorial design with an appropriate objective set-up, one is able to define the influence of each factor on thickening curves. Combined with the experimental work on some individual factors, the maturation control system can be further understood and the proper thickening rates can be obtained.
Similar content being viewed by others
References
I. C. Tung (1988): Proceedings of the 10th R. O. C. Polymer Symposium.
A. H. Horner and R. N. Brill (1984) : 39th RP/C paper 8-A.
Du Pont Nemours & Corporation (1975): Strategy of experiment, Revised edition October.
A. H. Horner, R. N. Brill, C. Fintelmann and O. C. Zaske (1983) : 38th RP/C paper 9-D.
A. H. Horner, R. Brill, and O. C. Zaske (1982) : 37th RP/C paper.
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Tung, IC. Application of factorial design to SMC viscosity build-up. Polymer Bulletin 25, 603–610 (1991). https://doi.org/10.1007/BF00293521
Accepted:
Issue Date:
DOI: https://doi.org/10.1007/BF00293521