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Author: Lenhart, Armin × End date: 1999 × Start date: 1990 ×

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    Practical strength of glass containers. Part 2. Influence of handling
    (Offenbach : Verlag der Deutschen Glastechnischen Gesellschaft, 1994) Wagner, Jörg; Müller-Simon, Hayo; Lenhart, Armin
    The practical strength of container glass depends not only on the stress distribution at the surface, but also on the type and distribution of surface defects. After the elimination of the influence of the container shape by means of finite element methods, different types of defect show a different behaviour in the Weibull plot. This behaviour can be used to compare different handling materials. The materials used at the cold end cause no measurable weakening of the strength. A special type of defect could be associated with the transfer conveyour belt. Carbon and brass were compared as deadplate materials without finding a specific influence on the container strength.
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    Characterization of filter dust in the glass container industry and definition of its influence on green glass melts
    (Offenbach : Verlag der Deutschen Glastechnischen Gesellschaft, 1995) Krauß, Manfred; Lenhart, Armin; Ratka, Heiko; Kircher, Ulrich
    Filter dust in the container glass industry is continuously and almost completely recycled in the original source tanks. However, problems sometimes occur, with this practice, in green glass furnaces, which can be put down to the fluctuating redox levels of the filter dust. The characterization of the dust shows that the determination of the levels of chemical oxygen demand and of sulphite content is insufficient to assess the redox effect in the glass melts. Therefore, melting experiments with green glass batches containing filter dust were carried out on a laboratory scale. Surprisingly, in all cases the experiments led to a light oxidation of the glasses by the filter dust. The reason for this is considered to be the sulphate content in the dust and possibly the oxidation of the sulphite to sulphate under laboratory conditions. Individual cases of reduction by filter dust, as observed in practice, could be possibly due to sulphide in the dust or to a high content of carbon in the glass cullet used. These could also be attributable to fluctuations in production conditions or to the amount of moisture in the old glass cullet.
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    Practical strength of glass containers : Part 1. Influence of the type of defect
    (Offenbach : Verlag der Deutschen Glastechnischen Gesellschaft, 1994) Müller-Simon, Hayo; Wagner, Jörg; Lenhart, Armin
    The practical strength of container glass depends not only on the stress distribution at the surface, but also on the type and distribution of surface defects. After the elimination of the influence of the container shape by means of finite element methods, different types of defect show a different behaviour in the Weibull plot. Especially seeds and blisters are shown to be twice as dangerous as inhomogeneides caused by handling materials. The accuracy of the stress determination is limited, thus, an identification of different types of inhomogeneities from the Weibull plot is not possible under the present conditions.