Electroless metal coating of load bearing member for elevator system
A belt for an elevator system includes a plurality of tension members arranged along a belt width, a jacket material at least partially encapsulating the plurality of tension members defining a traction surface, a back surface opposite the traction surface together with the traction surface defining a belt thickness, and two end surfaces extending between the traction surface and the back surface defining the belt width. A metallic coating layer applied from a liquid solution is positioned over at least one end surface of the two end surfaces.
1. A method for forming a belt for an elevator system comprising:
forming one or more tension elements configured to extend along a belt length;
at least partially enclosing the one or more tension elements in a jacket material, the jacket material defining:
a traction surface;
a back surface opposite the traction surface together with the traction surface defining a belt thickness; and
two end surfaces extending between the traction surface and the back surface defining the belt width; and
applying a metallic coating layer to at least one end surface of the two end surfaces from a liquid solution to improve fire retardation properties of the belt;
wherein the metallic coating layer is applied discontinuously along the belt length, defining a plurality of coating blocks and a plurality of coating gaps arranged in an alternating pattern along the belt length.
2. The method of claim 1 , further comprising applying the metallic coating layer to the at least one end surface and a selected portion of the traction surface and/or the back surface.
3. The method of claim 1 , wherein the metallic coating includes one or more of nickel, copper, aluminum, chrome, zinc, tin, gold, silver or alloys thereof, or alloys of nickel and phosphorus, or nickel and polytetrafluoroethylene (PTFE), or nickel and boron or alloys or combinations thereof.
4. The method of claim 1 , wherein applying the metallic coating layer further comprises:
activating the at least one end surface to improve adhesion of the metallic coating layer to the at least one end surface;
submerging the at least one end surface in an electrolyte solution for a selected period of time, the electrolyte solution containing a selected metal material; and
removing the at least one end surface from the electrolyte solution, the metal material deposited at the at least one end surface to form the metallic coating layer.
5. The method of claim 4 , wherein activating the at least one end surface includes one or more of cleaning with an oxidant, depositing a seed metal layer including tin, platinum or palladium, surface cleaning with an organic oxidizer solution or a strong acid solution, plasma treatment, ozone treatment, corona treatment, or UV laser treatment of the jacket material.
6. The method of claim 1 , further comprising masking selected portions of the at least one end surface to prevent adhesion of the metallic coating layer at the selected portions resulting in the discontinuous metallic coating layer.
7. The method of claim 1 , further comprising applying the metallic coating via an electroless plating process.
8. The method of claim 1 , further comprising:
applying the metallic coating layer to a first end surface of the two end surfaces;
turning the belt 180 degrees; and
applying the metallic coating layer to a second end surface of the two end surfaces.
9. A belt for an elevator system comprising:
a plurality of tension members arranged along a belt width and extending longitudinally along a belt length;
a jacket material at least partially encapsulating the plurality of tension members defining:
a traction surface;
a back surface opposite the traction surface together with the traction surface defining a belt thickness; and
two end surfaces extending between the traction surface and the back surface defining the belt width; and
a metallic coating layer applied from a liquid solution disposed over at least one end surface of the two end surfaces;
wherein the metallic coating layer is discontinuous along the belt length, defining a plurality of coating blocks and a plurality of coating gaps arranged in an alternating pattern along the belt length.
10. The belt of claim 9 , wherein the metallic coating layer is disposed at the at least one end surface and a selected portion of the traction surface and/or the back surface.
11. The belt of claim 9 , wherein the metallic coating layer includes nickel, copper, aluminum, chrome, zinc, tin, gold, silver or alloys thereof, or alloys of nickel and phosphorus, or nickel and polytetrafluoroethylene (PTFE), or nickel and boron or alloys or combinations thereof.
12. The belt of claim 9 , wherein the metallic coating layer is configured to improve flame retardation properties of the belt.
13. The belt of claim 9 , wherein the jacket material is an elastomeric material.
14. The belt of claim 9 , wherein the metallic coating layer is applied via an electroless plating process.