Channel: Product news
PSR: Glass temperature measurement in forehearths and distributors

2014-04-20 | Product news

Precise forehearth and distributor temperature control is essential if consistent feeder operation and efficient glassware production are to be maintained. To control the glass temperature it must be accurately measured. Here we describe and compare the temperature sensors recommended and used in our forehearth and distributor systems.

A feeder forehearth providing gobs to the forming machine
The function of the feeder forehearth is to provide gobs of glass to the forming machine at a constant, uniform temperature suitable for the particular forming process, at a constant weight and shape and at the required speed of the forming machine. The most important physical parameter for the forming process is the glass viscosity and as this varies on a logarithmic scale with glass temperature (small changes in temperature producing large changes in viscosity), precise forehearth temperature control is essential if consistent feeder operation and efficient glassware production are to be maintained.
The actual gob temperature is normally controlled indirectly by controlling the equalizing section temperature of the forehearth and measuring the gob temperature periodically with a portable infra-red pyrometer. Some companies install thermocouples in the feeder spout but these temperature readings are significantly affected by the location of the thermocouple and the feeder tube rotation direction and speed. Although the gob temperature is of prime importance, many glass companies still do not measure this at all and rely entirely on the measurement and control of the equalizing section temperature.
The uniformity of the gob temperature can be evaluated on a qualitative basis by observing the formation of the gob preferably with the feeder tube stopped from rotating. This assumes that all the feeder expendable refractory parts have been correctly selected and installed and that...

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Article taken from Glass Machinery Plants & Accessories bi-monthly magazine (6 issues per year)
Year: 2014 number: 2
Check out Glass Machinery Plants & Accessories magazine

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