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May 18, 2010
Renau's New Speech Synthesizer Module Helps Kitchen Staff While Cutting Down on Noise...
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March 30, 2010
Renau Electronic Laboratories is proud to announce the release of our new STM-04 Smart Thermocouple Module...
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March 30, 2010
Renau Electronic Laboratories again demonstrates the power, flexibility, and ease-of-use...
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June 10, 2009
Renau's Innovative UCM-1000V Offers Design Flexibility for Equipment Manufacturers While Significantly Simplifying Training...
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July 24, 1990

Renau Awarded United States Patent 4,943,706 for Method and Apparatus for Fusing Thermoplastic Materials

Renau has been awarded United States Patent # 4,943,706. This patent is for an apparatus and method for attaining fusion temperature at substantially the same time throughout an interface between thermoplastic articles by the controlled application of heat. The method includes providing a sensed temperature signal corresponding with the temperature at the interface, generating a desired temperature signal (such as an analog ramp signal which increases linearly with time) corresponding with a predetermined heat application rate which causes the temperature at substantially all portions of the interface to rise substantially uniformly, providing a heat control signal corresponding with any difference between said signals, and applying heat to the interface at a rate determined by the heat control signal to achieve fusion temperature throughout the interface at the same time. The apparatus includes a heater coil to apply heat to the interface, a sensor to provide the sensed temperature signal, a generator to provide the desired temperature signal, and a differential amplifier to provide the heat control signal. Fault detection circuits stop the process if a heater fault, a temperature sensor fault, or a power supply fault is detected. Testing circuits are included to test the apparatus for proper operation before commencing fusion.