Heat/process control

Details Heat/process control Heat/process control

1992-01-17

1993-11-16

Paschall, Mark H.

Electric heating

Heating devices

With power supply and voltage or current regulation or...

219388, 219483, 219497, 219506, H05B 102

Patent

active

052626180

ABSTRACT:
A heat/process control is disclosed which takes advantage of the characteristics of some plastics in that they absorb medium wavelength infra-red heat waves in a comparatively wide range of temperatures (and therefore wavelengths). The heaters used in this equipment are of quartz-tube construction which can be used through a wide temperature range. Tests have indicated that lamp wattage and machine processing speed were mathmatically related. For plastics of different formulation and/or thickness a series of parametric curves exist. Each curve is resident in the machine control and can be incorporated with a simple selector switch. For a given plastic a mathmatical equation relating speed and heater temperature is selected. If an increase in speed is required, the target speed and associated temperature is calculated and then loaded into the controller. Since the heaters cannon respond instantaneously, the heaters are fitted with temperature feedback devices which are used to vary the machine speed in accord with the heater actual temperatures. As the heater temperatures rise, the actual temperature of the heaters is input into an equation which calculates an appropriate increase in machine speed. This correlation of speed and temperature results in the most efficient use of energy because when operating, the machine never used more energy than required at a given operating level.

REFERENCES:
patent: 4087568 (1978-05-01), Fay et al.
patent: 4358192 (1982-11-01), Goldberg et al.
patent: 4671757 (1987-06-01), Volk, Jr.

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