Forehearths Process Control - Continuous Gob Monitoring System

The fact that physical properties of the glass as a function of temperature makes forehearth control difficult. Forehearth control is particularly important in the container glass industry where control of not only the temperature but also constant gob weight is critical. Proper control reduces the number of rejects, which in turn increases productivity and saves energy.

The continuous gob monitoring system (CGMS) was developed by British Glass and can be applied to any system in which a pre-formed gob is delivered to a forming machine. The CGMS monitors the weight of the gob for each container so that corrective action can be taken if the containers are overweight or underweight. This reduces both specific energy consumption and material waste. In addition, the production process is stabilized, the target weights can be specified more exactly, and equipment redundancy can be reduced. By installing this system, a plant in the UK was able to achieve sizable energy savings, while also reducing their material use by 151 tonnes/year (Worrell et al., 2008. p.71).

Development Status Products
Commercial
Glass

Forehearths Process Control - Continuous Gob Monitoring SystemCosts & Benefits

Parent Process: Conditioning and Forming
Energy Savings Potential

By installing this system, a glass container plant in the UK realized primary energy savings of 2.4 TJ/year (Worrell et al., 2008. p.71).

CO2 Emission Reduction Potential
Costs

The plant in the UK realized savings of $8,600/year due to reduced energy cost and $8,500/year due to reduced material costs. With a total investment of $26,000, the payback time was 18 months [1993 values] (Worrell et al., 2008. p.71).

Forehearths Process Control - Continuous Gob Monitoring System Publications

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