A modeling comparison of the narrow neck press and blow and the blow and blow container forming processes

摘要

Glass container production has progressed through the centuries by trial-and-error improvements and inheritance of accumulated experience. Recently, however, glass companies have begun to invest in research projects aimed at improving both the quality and productivity of the containers. This has been motivated by aggressive competition from the plastic container industry. Glass scientists are now constantly working to enhance their understanding of product behavior and processes on a more fundamental basis. In particular, the thermomechanical behavior of the glass as it moves through the container forming machine remains a mystery to most bottlemakers. Most advances in glass forming and mold cooling technologies have been made on an ad hoc basis rather than through a systematic understanding of the fundamental physics. Unfortunately, the governing equations that describe the forming phenomena and their boundary conditions are extremely complex and gross simplifications must be made in order to solve the resultant equations analytically. In the past, solutions to only very special cases of the forming operations were available.