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ELECTRIC INFRARED

HOT STUFF!

COMBINATION INFRARED/CONVECTION OVEN AT HENDRY TELEPHONE PRODUCTS CURES POWDER-COATED THIN
AND THICK GAUGE METAL PARTS


A new combination infrared/convection oven is bringing a number of advantages in the curing of an assortment of powder-coated telephone communications equipment for a California manufacture. Hendry Telephone Products, located in Goleta, just west of Santa Barbara, makes racks, frames, fuse panel boxes and various other products.The steel and aluminum parts vary in size from small, thin gauge components to bulky thick gauge structures weighing over 200 lbs..

The 72 ft. oven accomodates up to 3 ft. wide and 4 ft. high. It allows the curing of parts in as little as 5 minutes. The thick gauge parts are cured in as little as 9 minutes.

The initial eight-zone electric infrared section quickly ramps up the temperature of surfaces receiving the line-of-sight radian heat. The three zone gas convection section then raises the temperature surfaces hidden from the radiant heat. Utilizing a high air flow, the convection section then holds all surfaces at 415° F for the curing cycle.

The Thermal Innovations (Manasquan, NJ) Speed Oven™ supplies indirect gas-fired heat through the use of heat exchangers and individual control of the infrared and convection zones allows various cure profiles. Three profiles are programmed to adjust dwell times in the infrared and convection zones for line speeds ranging from 5 to 13- 1/2 FPM.

Advantages of the oven, according to James Keenan, Hendry president, include increased line speeds, improved productivity, increased energy effeciency and improved utilization of plant floor space.

"The oven space increases our production capacity by 300%", adds Keenan. "Floor space is at a premium in our 35,000 square foot building, If we would have installed a conventional convection oven, we would have needed an oven 250 ft. long to meet our requirements".

The oven replaces an old batch oven that required 45 minute curing cycle for large parts. The new oven is installed on the site of the old. The old oven was part of a wet finishing system. " Conversion from the wet system to powder coating was made gradually over nine months without losing production", according to Greg Hampton, industrial and manufacturing engineer. "We noticed savings right away. For example, a job that used to take us 8 hours now takes only 1 hour and 15 minutes".

POWDER COATING CURED IN 90 SECONDS AT 30 TO 40 FPM

The world's first powder-coating and high speed infrared curing system to be employed in the production of steel lintels (load bearing supports over doors and windows) is reaping multiple benefits for the Catnic group of England. The system addresses environmental compliance issues and maintains productivity levels while substantially reducing floor space requirements.

Infrared technology and indirect gas fired convection heating are combined in the oven. The infrared component provides a quick temperature ramp-up; the convection stage maintains a temperature of 430° to 465° F to ensure an even cure.

The powder is cured in under 90 seconds at a line speed of 30 to 40 FPM, depending on part size. Comparable cure time in a pure convection oven would be 20 minutes. The entire production cycle, including forming, welding, coating and curing is only 4 minutes.

An automated conveying system and PLC based recipe control gives the Catnic the capability to maintain temperature uniformity and regulate power consumption regardless of lintel thickness.

Triab, a Swedish based Finishing company and Thermal Innovations Corporation (Manasquan, NJ), it's U.S. agent, upgraded Catnic's lintel-finishing lines.

 

Copyright 2001

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