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Infrared-furnace-with-muffle

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Infrared furnace with muffle

Details

Inventors: Crain, N. Robert; Hardison, Robert P.;
Assignee: Radiant Technology Corporation (Cerritos, CA)
Primary Examiner: Albritton; C. L.
Assistant Examiner: Walberg; Teresa J.
Attorney, Agent or Firm: Christie, Parker & Hale

An infrared furnace has a firing chamber in which a source of infrared energy is disposed and an elongated envelope transparent to the infrared energy extending through the firing chamber. The envelope has first and second open ends outside the firing chamber. First and second baffle chambers surround the respective first and second ends of the envelope. A product conveyor travels through the furnace via the baffle chambers and the envelope. Gas flow is prevented from the exterior of the furnace into the baffle chambers and from the firing chamber into the baffle chambers. Non-atmospheric gas is supplied to the baffle chambers so as to create therein a superatmospheric pressure which prevents gas flow into the baffle chambers from the exterior of the furnace. The non-atmospheric gas is exhausted from one of the baffle chambers, thereby inducing flow of the non-atmospheric gas from the other baffle chamber through the envelope. A seal chamber is disposed between each baffle chamber and the firing chamber such that gas leakage from the seal chamber to the baffle chamber and to firing chamber occurs around the periphery of the envelope. A packing is compressed against the periphery of the envelope and the walls of the seal chamber to minimize such leakage and the seal chamber is pressurized with non-atmospheric gas to prevent gas flow from the firing chamber to the baffle chamber.

DETAILED DESCRIPTION OF THE SPECIFIC EMBODIMENT With reference to FIG.
1, an infrared furnace incorporating principles of the invention comprises a plurality of interconnected chambers as follows: an entrance chamber 10 leading to a baffle chamber 11; a seal chamber 12 at the interface between baffle chamber 11 and a firing chamber 13 with muffle; a seal chamber 14 at the interface between firing chamber 13 and a baffle chamber 15; and an exit chamber 16 to which baffle chamber 15 is connected by a cooling chamber 17.
As described in more detail below, a product conveyor constructed in the manner disclosed in the referenced application, travels through the described chambers including the muffle in firing chamber 13, which extends through seal chambers 12 and 14 into baffle chambers 11 and 15.
The ends of the muffle, which are open, are surrounded by baffle chambers 11 and 15, respectively.
Entrance chamber 10, baffle chamber 11, and seal chamber 12 are shown in FIG.
2.
A porous conveyor belt 18 travels through a horizontally elongated passage 20 through the furnace.
Products to be fired, such as copper layers on thick film circuits, travel in carrier trays (not shown) through passage 20 from left to right on conveyor belt 18.
Partitions 22 pivotally mounted on a horizontal bracket 43 serve to impede the flow of gas through passage 20 to the exterior of the furnace.
As a carrier passes under a partition 22, it contacts the partition and pivots it in a counterclockwise direction as viewed in FIG.
2.
Alternatively, stationary partitions having a clearance with respect to the carrier trays could be provided.
Near the end of entrance chamber 10, a vertical upwardly extending exhaust duct 25 communicates with passage 20.
A blower not shown in duct 25 draws gas out of passage 20.
One or more dampers 26 serve to control the flow rate of exhaust gas passing through duct 25.
Except for the absence of an exhaust duct, exit chamber 16 is the same as entrance chamber 10 and therefore is not shown in detail

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