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Analysis Of The Blank Mould - A Transient Heat Transfer Problem In Glass Forming

The glass forming process studied here is a narrow neck press-blow process, resulting in a bottle. The final glass distribution of the bottle depends on the temperature distribution and the shape of the panson. If the temperature of the panson is inaccurate, a proper distribution of the thickness of the bottle can not be obtained. The mould comes into contact with the hot glass for a certain time, after which the mould is cooled. This sequence is repeated in the calculation until "stationarity" is approached, i e the temperature distribution of the mould is the same before and after a heating and cooling cycle. The heat transfer from the gob to the blank mould is analysed. An adequate model of the blank mould is made and the temperature distribution within the mould is calculated as a function of space and time. The temperature distribution is necessary in the design process of new equipments in order to get a better glass quality. The result of the analysis is also very valuable for planning experiments. A combination of computer simulations and measurements reduces the number of tests as well as the cost.