Heat Distribution | TGID Newsletter - July 27 2007




	Electric Heating Co., Inc

TGID
27-Jul-07

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Heat Distribution

Occasionally we will be confronted with an application in which the distribution of heat over the length or width of a workpiece is not even. The customer needs an even temperature profile and asks us to fix it. Examples can be a heat seal bar, a heated platen for sealing covers to boxes or large dies used to laminate plastic stock to other materials.

The use of Watt-Flex® cartridge heaters often will correct uneven heat distribution because they have a substantially more even heat profile as compared with a conventional heater. However, to compensate for the inequity of heat profile, we can supply a distributed wattage heater.

This is accomplished by designing different densities of coil along the full length of the continuous resistance coil in the heater. Generally, more heat is assigned to the extremities of the heater to compensate for radiant heat loss off the sides of a platen or off the ends of a sealing bar. How much wattage in each area ...that is the trick and we will address that next week.

Friday Funnies

Once upon a time in a land far away,

a beautiful, independent, self-assured princess happened upon a frog as she sat contemplating ecological issues on the shores of an unpolluted pond in a verdant
meadow near her castle.

The frog hopped into the princess' lap and said: " Elegant Lady, I was once a handsome prince, until an evil witch cast a spell upon me. One kiss from you, however, and I will turn back into the dapper, young prince that I am and then, my sweet, we can marry and set up housekeeping in your castle with my mother, where you can prepare my meals, clean my clothes, bear my children, and forever feel grateful and happy doing so."

That night, as the princess dined sumptuously on lightly sautéed frog legs seasoned in a white wine and onion cream sauce, she chuckled and thought to herself:

"I just don't think so."

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Dalton Electric Heating Co., Inc (978)356-9844
28 Hayward Street Ipswich, MA 01938 USA