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US 6,887,314 B2Granted
System for coating a substrate
AssigneeMaterial Sciences Corporation
InventorsDouglas E. Edwards, Mark R. Monterastelli
Life of this patent
Estimating the term…
Abstract
A method and apparatus for coating sheet material with thermoset material. In certain embodiments, first and second different induction furnaces are provided, with the coated sheet first proceeding into and through the first furnace, and then into and through the second furnace. The first furnace may be maintained at a temperature less than the second furnace, so that out-gassing of volatile materials is achieved in the first furnace and thereafter heightened cross-linking conversation rates are achieved in the second furnace at higher temperatures.
Claims13
A system for manufacturing a coated article, comprising:
- a) a chamber for electrostatically applying a thermoset powder coating to a substrate;
- b) a first oven operably associated with said chamber, said first oven operated for heating the substrate and thereby the powder to a first temperature sufficient to melt the powder, permit degassing, and effect cross-linking conversion of the powder at a first rate;
- c) a second oven downstream and spaced from the first oven, the second oven operated for heating the substrate to a second temperature higher than the first temperature in order to effect cross-linking conversion of the powder at a second rate that is faster than the first rate to achieve curing, the second oven is operated at a temperature for causing a cross linking percentage of the thermoset coating to rise at a rate of at least about 35 percentage points during a period of about 0.05 minutes;
- d) a space between said first and second ovens sufficient to permit the powder melted in said first oven to be degassed prior to entering said second oven;
- and
- e) a quench station downstream of said second oven for quenching the coated article.
3 more elements
A system for manufacturing a coated article, comprising:
- a) a chamber for electrostatically applying a thermoset powder coating to a substrate;
- b) a first oven operably associated with said chamber, said first oven operated for heating the substrate and thereby the powder to a first temperature sufficient to melt the powder, permit degassing, and effect cross-linking conversion of the powder at a first rate;
- c) a second oven downstream and spaced from the first oven, the second oven operated for heating the substrate to a second temperature higher than the first temperature in order to effect cross-linking conversion of the powder at a second rate that is faster than the first rate to achieve curing, the second oven is operated at a temperature for causing cross-linking percentage of the thermoset coating to rise from about 45% to at least about 95% in the second oven in less than about 0.10 minutes;
- d) a space between said first and second ovens sufficient to permit the powder melted in said first oven to be degassed prior to entering said second oven;
- and
- e) a quench station downstream of said second oven for quenching the coated article.
3 more elements
A system for manufacturing a coated article, comprising:
- a) a chamber for electrostatically applying a thermoset powder coating to a substrate;
- b) a first oven operably associated with said chamber, said first oven operated for heating the substrate and thereby the powder to a first temperature sufficient to melt the powder, permit degassing, and effect cross-linking conversion of the powder at a first rate;
- c) a second oven downstream and spaced from the first oven, the second oven operated for heating the substrate to a second temperature higher than the first temperature in order to effect cross-linking conversion of the powder at a second rate that is faster than the first rate to achieve curing, the second oven is operated at a temperature for causing a cross linking percentage of the thermoset coating to rise at a rate of from about 35 to 60 percentage points during the period of about 0.05 minutes;
- d) a space between said first and second ovens sufficient to permit the powder melted in said first oven to be degassed prior to entering said second oven;
- and
- e) a quench station downstream of said second oven for quenching the coated article.
3 more elements
A system for manufacturing a coated article, comprising:
- a) a chamber for electrostatically applying a thermoset powder coating to a substrate;
- b) a first oven operably associated with said chamber, said first oven operated for heating the substrate and thereby the powder to a first temperature sufficient to melt the powder, permit degassing, and effect cross-linking conversion of the powder at a first rate;
- c) a second oven downstream and spaced from the first oven, the second oven operated for heating the substrate to a second temperature higher than the first temperature in order to effect cross-linking conversion of the powder at a second rate that is faster than the first rate to achieve curing, the second oven is operated at a temperature for causing a cross linking percentage of the thermoset coating to rise at a rate of from about 40 to 50 percentage points during the period of about 0.05 minutes;
- d) a space between said first and second ovens sufficient to permit the powder melted in said first oven to be degassed prior to entering said second oven;
- and
- e) a quench station downstream of said second oven for quenching the coated article.
3 more elements
Dependencies are inferred from the claim text.