Coating drum and system for vapor deposition
A vapor deposition system includes a drum. The drum includes a generally cylindrical drum core. A process ring is fixedly disposed on the drum core at a position radially outward of the drum core. The process ring includes an inner face that extends radially, an outer face that extends radially opposite the inner face, and an outer-facing surface extending between the inner face and the outer face. The outer-facing surface has a plurality of axial channels formed therethrough. A plurality of fluid coolant passages extends through the process ring. An annular gas channel is in communication with the plurality of axial channels. A fluid conduit assembly is configured to supply a fluid coolant to the fluid coolant passages and a thermal coupling gas to the annular gas channel. The axial channels direct thermal coupling gas toward the substrate.
1 . A drum for a vapor deposition system, comprising:
a generally cylindrical drum core;
a process ring fixedly disposed on the drum core at a position radially outward of the drum core, the process ring including:
an inner face that extends radially, an outer face that extends radially opposite the inner face, and an outer-facing surface extending between the inner face and the outer face, the outer-facing surface comprising a plurality of axial channels formed therethrough,
a plurality of fluid coolant passages that extend through the process ring,
an annular gas channel in communication with the plurality of axial channels,
an outer flange attached to the outer face of the process ring and to the drum core to attach the process ring to the drum core, the annular gas channel being defined by the outer flange and the outer face of the process ring, the annular gas channel being configured to supply a thermal coupling gas to the plurality of axial channels; and
a fluid delivery assembly comprising:
a first conduit configured to supply a fluid coolant to a plurality of inlet pipes connected to the fluid coolant passages at the outer face of the process ring;
a second conduit for providing a return path for the fluid coolant; and
a gas distributor configured to supply the thermal coupling gas from a gas inlet to a plurality of gas supply conduits connected to the annular gas channel,
wherein the drum core is axially disposed on the fluid delivery assembly.
2 . The drum of claim 1 , wherein, in operation, when a substrate is wrapped about at least a portion of the drum core, the thermal coupling gas exits from the axial channels and is directed onto the substrate.
3 . The drum of claim 1 , wherein the outer-facing surface extends from the outer face of the process ring axially to an inner face of the process ring.
4 . The drum of claim 1 , further comprising an outer flange attached to the outer face of the process ring and to the drum core to attach the process ring to the drum core.
5 . The drum of claim 4 , wherein the outer flange and the outer face define an outer fluid conduit therebetween.
6 . The drum of claim 5 , wherein the outer fluid conduit is in fluid communication with the first conduit of the fluid delivery assembly and is configured to permit the fluid coolant to enter the fluid coolant passages.
7 . The drum of claim 6 , further comprising an inner flange attached to the inner face of the process ring and to the drum core to attach the process ring to the drum core.
8 . The drum of claim 7 , wherein the inner flange and the inner face define an inner fluid conduit therebetween.
9 . The drum of claim 8 , wherein the inner fluid conduit is in fluid communication with the fluid coolant passages and is configured to permit the fluid coolant to exit the fluid coolant passages and return to the second conduit of the fluid delivery assembly.
10 . The drum of claim 1 , wherein each of the axial channels is a slot formed through the process ring and is open to the radially outer-facing surface.
11 . The drum of claim 1 , further comprising an outer flange attached to the outer face of the process ring and an inner flange attached to the inner face of the process ring.
12 . The drum of claim 1 , wherein the thermal coupling gas includes helium.
13 . The drum of claim 11 , wherein the outer flange and the inner flange both have a first diameter, and the process ring has a second diameter, wherein the first diameter is greater than the second diameter.
14 . The drum of claim 13 , wherein the first diameter is from about 0.001″ to about 0.004″ greater than the second diameter.
15 . The drum of claim 13 , wherein the first diameter is about 0.002″ greater than the second diameter.
16 . The drum of claim 15 , wherein, in operation, when a substrate is wrapped about the drum core and is extended between the outer flange and the inner flange a gap is formed between the substrate and the outer-facing surface that is about 0.001″ in depth.
17 . The drum of claim 16 , wherein the thermal coupling gas is fed to the gap during operation.
18 . The drum of claim 1 , wherein the first conduit and the second conduit are arranged concentrically along a central axis of the drum core.