초록 ▼

An oven is disclosed as having a plurality of chambers which are sealed from the ambient atmosphere, and to which gas, heated to a high temperature outside the chambers, is circulated to each of the chambers for admixture with gas which is cool compared to the high temperature gas, to produce in the

An oven is disclosed as having a plurality of chambers which are sealed from the ambient atmosphere, and to which gas, heated to a high temperature outside the chambers, is circulated to each of the chambers for admixture with gas which is cool compared to the high temperature gas, to produce in the chambers a mixture of hot and cool gas at a predetermined temperature. The hot gas is circulated to the chambers at a certain desired pressure, wherein the cool gas is circulated to the chambers at a certain rate of flow. Gas is exhausted from the oven also at a fixed rate of flow. The gas pressure in the first oven to be encountered by an element passing through the oven, is monitored and triggers a change in the flow of cool gas when the pressure varies from a desired norm. This change in flow of cool gas influences the temperature which is also monitored. A change in the temperature produces a corresponding change in the mixture of hot and cool gas to return the oven temperature to the desired level.

대표청구항 ▼

An oven, comprising: (a) at least one chamber which is substantially sealed from the ambient atmosphere; (b) means for guiding an element, to be heated, through the chamber in a substantially horizontal pathway; (c) means for circulating gas, heated to a certain desired temperature, to the chamber a

An oven, comprising: (a) at least one chamber which is substantially sealed from the ambient atmosphere; (b) means for guiding an element, to be heated, through the chamber in a substantially horizontal pathway; (c) means for circulating gas, heated to a certain desired temperature, to the chamber at a predetermined desired pressure; (d) means for circulating gas, which is cool compared to the heated gas, to the chamber for mixture with the heated gas, prior to circulation of the mixture to the chamber for impingement against the element as it travels through the chamber, to produce in the chamber a gaseous atmosphere having a predetermined desired temperature and pressure; (e) means for exhausting gas from the chamber at a predetermined constant flow rate; (f) means for monitoring the gas pressure within the chamber; and (g) means for first modulating the flow of cool gas to the chamber when the gas pressure within the chamber varies from a desired norm.