Heating assemblies providing a high degree of uniformity over a surface area
A uniform heating assembly including at least one first insulative substrate, at least one first common terminal, at least one second common terminal and a multiplicity of conductive filaments at least partially embedded in the at one insulative substrate and extending at least mainly along both electrically parallel and geometrically parallel paths between the at least one first common terminal and the at least one second common terminal.
1. A uniform heating assembly comprising:
at least one first insulative substrate;
a first common terminal;
a second common terminal, said first common terminal and said second common terminal being located adjacent the same edge of said insulative substrate;
a multiplicity of continuous conductive filaments at least partially embedded in said at least one first insulative substrate and extending at least mainly along both electrically parallel and geometrically parallel paths, each of said multiplicity of continuous conductive filaments extending between said first common terminal and said second common terminal, said multiplicity of conductive filaments generally not crossing over each other between said first and second terminals, adjacent edges of adjacent ones of said multiplicity of conductive filaments being separated by less than 0.030 inches (0.762 mm) along said geometrically parallel paths between said first common terminal and said second common terminal, said electrically parallel and geometrically parallel paths including straight portions and bent portions; and
at least one second insulative substrate located over said multiplicity of conductive filaments,
said uniform heating assembly providing heating to a temperature in excess of 300 degrees F. with a temperature variation of less than 20 degrees F. over the extent of the heating blanket.
2. A uniform heating assembly according to claim 1 and wherein adjacent edges of adjacent ones of said multiplicity of conductive filaments are separated by less than 0.020 inches (0.508 mm) along said geometrically parallel paths between said first common terminal and said second common terminal.
3. A uniform heating assembly according to claim 1 and wherein adjacent edges of adjacent ones of said multiplicity of conductive filaments are separated by less than 0.010 inches (0.254 mm) along said geometrically parallel paths between said first common terminal and said second common terminal.
4. A uniform heating assembly according to claim 1 and wherein adjacent edges of adjacent ones of said multiplicity of conductive filaments are separated by 0.008 inches (0.203 mm) along said geometrically parallel paths between said first common terminal and said second common terminal.
5. A uniform heating assembly according to claim 1 and wherein said uniform heating assembly provides heating to a temperature in excess of 300 degrees F. with a temperature variation of less than 17 degrees F. over the extent of the heating blanket.
6. A uniform heating assembly according to claim 1 and wherein said multiplicity of conductive filaments comprise a multiplicity of resistance wires.