Radiant oven

Details Radiant oven Radiant oven

2000-08-23

2001-11-06

Pelham, Joseph (Department: 3742)

Electric heating

Heating devices

Combined with container, enclosure, or support for material...

C219S388000, C219S411000, C034S274000, C034S273000

Reexamination Certificate

active

06313444

ABSTRACT:

FIELD OF THE INVENTION
The present invention relates to a radiant oven and more particularly to a radiant web-treating or fabric-treating oven.
BACKGROUND OF THE INVENTION
Radiant ovens generate heat by the use of radiant heaters. In many radiant ovens the radiant heaters are contained in the same oven cavity where the item to be heated is placed. While this is acceptable in many applications, in some cases the item to be heated should not be directly exposed to an electric radiant heater. An example of this is heat-treatment of solvent-laden fabric or web.
In treating web or fabric, it is often necessary to heat the web or fabric to drive off solvent. The solvent vapors can create a fire or explosion hazard, however, if they contact a heating element, especially if failure of the heating element creates a short circuit or other source of ignition. The area of the oven in which solvent vapors accumulate is referred to as the classified area. Spaces that remain free of solvent vapors are referred to as nonclassified areas.
To avoid the fire or explosion hazard caused by solvent vapors, special classified electric radiant heaters are used. Classified electric radiant heaters are designed to be used in classified areas of an oven and reduce or eliminate the possibility of solvent ignition. The drawback to their use is their increased cost.
To reduce expense and improve maintainability, it would be advantageous to be able to use nonclassified electric radiant heaters in or adjacent to the classified area of ae web- or fabric-treating oven. There is a need for a radiant oven utilizing nonclassified electric radiant heaters that can treat items in situations that heretofore required the use of classified electric radiant heaters.
SUMMARY OF THE INVENTION
A radiant oven is provided for treating material. The oven has electric radiant heaters, oven walls, and radiant buffer plates. The buffer plates and oven walls define an oven chamber. During operation the oven chamber is a classified area, and is separated from the nonclassified area by the oven walls and buffer plates. At least one electric radiant heater is located in the nonclassified area.


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