Traction Rolls for Use in Glass Making

Claim 2

A TRACTION ROLL FOR ENGAGING GLASS COMPRISING: A MANDREL, A ROLL BODY COMPRISING AN ASBESTOS MATERIAL MOUNTED ON SAID MANDREL TO PROVIDE RESILIENCY TO SAID ROLL BODY; AND A THIN LAYER OF A DENSE, DURABLE MATERIAL HAVING A DENSITY GREATER THAN THE DENSITY OF SAID ASBESTOS MATERIAL SURROUNDING SAID ROLL BODY, SAID DURABLE MATERIAL BEING SELECTED FROM THE GROUP CONSISTING OF ALUMINOSILICATE, AN OXIDE OF CHROMIUM, MANGANESE, IRON, COBALT, NICKEL, COPPER AND MIXTURES THEREOF, A SILICONE RUBBER AND AN ELASTIC HEAT RESISTANT, THERMOSETTING ORGANIC POLYMER HAVING IGNITION AND DEGRADATION POINTS ABOVE ABOUT 500*F., AND BEING SELECTED FROM THE GROUP CONSISTING OF POLYIMIDES, POLYOXAZOLIDONES, POLYSULFONES AND POLYTHENYL OXIDES.

Claim 3

The traction roll according to claim 1 wherein said layer of organic polymer is reinforced with refractory fibers.

Claim 4

The traction roll according to claim 2 wherein said reinforcing refractory fibers are asbestos fibers.

Claim 5

The traction roll according to clain 1, wherein said roll body is surrounded by a layer of an elastic silicone rubber which retains its elasticity on prolonged exposure to temperatures of about 1,000*F. and said elastic rubber layer is surrounded by a layer of an elastic heat resistant thermosetting organic polymer having an ignition and degradation temperature of above about 500*F. selected from the group consisting of polyimides, polyoxazolidones, polysulfones and polyphenyl oxides.

Claim 6

The traction roll according to clain 1, wherein said roll body is surrounded by a layer of an elastic silicone rubber which retains its elasticity on prolonged exposure to temperatures of about 1,000*F. and said elastic rubber layer is surrounded by a layer of an elastic heat resistant thermosetting organic polymer having an ignition and degradation temperature of above about 500*F. selected from the group consisting of polyimides, polyoxazolidones, polysulfones and polyphenyl oxides.

Claim 7

The traction roll according to claim 4 wherein said organic polymer is reinforced with asbestos fibers.

Claim 8

A traction roll for engaging glass, comprising: a roll body comprising a refractory material; a layer of silicone rubber surrounding said roll body; at least one ply of bias-wrapped, fiber glass cloth reinforced B-stage polyimide tape, heat cured in place about said layer of silicone rubber; and at least one ply of polyimide impregnated asbestos cloth heat cured in place about said at least one ply of bias-wrapped, fiber glass cloth reinforced B-stage polyimide tape.

Claim 9

A traction roll for engaging glass, comprising: a roll body comprising a refractory material; a layer of silicone rubber surrounding said roll body; at least one ply of bias-wrapped, fiber glass cloth reinforced B-stage polyimide tape, heat cured in place about said layer of silicone rubber; and at least one ply of polyimide impregnated asbestos cloth heat cured in place about said at least one ply of bias-wrapped, fiber glass cloth reinforced B-stage polyimide tape.

Claim 10

A TRACTION ROLL FOR ENGAGING GLASS, COMPRISING: A MANDREL; AND A ROLL BODY MOUNTED ON SAID MANDREL, SAID ROLL BODY MADE OF ASBESTOS IMPREGNATED WITH AN ALKALINE EARTH METAL SULFATE.

Claim 11

A TRACTION ROLL FOR ENGAGING GLASS, COMPRISING: A MANDREL; AND A ROLL BODY MOUNTED ON SAID MANDREL, SAID ROLL BODY MADE OF ASBESTOS IMPREGNATED WITH AN ALKALINE EARTH METAL SULFATE.

Claim 12

The traction roll according to claim 7 wherein said alkaline earth metal sulfate is magnesium sulfate.

Claim 13

IN A SHEET DRAWING MACHINE COMPRISING A DRAWING KILN AND THEREABOVE AN ENCLOSED COOLING CHAMBER COMPRISING A KILN PORTION. A LEHR PORTION AND A CONVEYING AND COOLING PORTION, EACH HAVING TRACTION ROLLS THEREIN, THE IMPROVEMENT COMPRISING, IN SAID KILN PORTION AND IN SAID LEHR PORTION, TRACTION ROLLS, EACH COMPRISING AN ASBESTOS ROLL BODY OVERLAID WITH ALUMINOSILICATE, AND, IN SAID CONVEYING AND COOLING PORTION, TRACTION ROLLS, EACH COMPRISING A ROLL BODY OVERLAID WITH AN ELASTIC MATERIAL FURTHER OVERLAID WITH A HEAT RESISTANT, THERMOSETTING, ORGANIC POLYMER HAVING AN IGNITION AND DEGRADATION TEMPERATURE OF ABOVE ABOUT 500*F. SELECTED FROM THE GROUP CONSISTING OF POLYIMIDES, POLYOXAZOLIDONES, POLYSULFONES AND POLYPHENYL OXIDES.

Claim 14

IN A SHEET DRAWING MACHINE COMPRISING A DRAWING KILN AND THEREABOVE AN ENCLOSED COOLING CHAMBER COMPRISING A KILN PORTION. A LEHR PORTION AND A CONVEYING AND COOLING PORTION, EACH HAVING TRACTION ROLLS THEREIN, THE IMPROVEMENT COMPRISING, IN SAID KILN PORTION AND IN SAID LEHR PORTION, TRACTION ROLLS, EACH COMPRISING AN ASBESTOS ROLL BODY OVERLAID WITH ALUMINOSILICATE, AND, IN SAID CONVEYING AND COOLING PORTION, TRACTION ROLLS, EACH COMPRISING A ROLL BODY OVERLAID WITH AN ELASTIC MATERIAL FURTHER OVERLAID WITH A HEAT RESISTANT, THERMOSETTING, ORGANIC POLYMER HAVING AN IGNITION AND DEGRADATION TEMPERATURE OF ABOVE ABOUT 500*F. SELECTED FROM THE GROUP CONSISTING OF POLYIMIDES, POLYOXAZOLIDONES, POLYSULFONES AND POLYPHENYL OXIDES.

Claim 15

In a sheet drawing machine comprising a drawing kiln and thereabove an enclosed cooling chamber comprising a kiln portion, a lehr portion and a conveying and cooling portion, each having traction rolls therein, the improvement comprising, in said kiln portion and in said lehr portion, traction rolls, each comprising an asbestos roll body impregnated with alkaline earth metal sulfate, and, in said conveying and cooling portion, traction rolls, each comprising a roll body overlaid with an elastic material further overlaid with a heat resistant, thermosetting, organic polymer having an ignition and degradation temperature of above about 500*F. selected from the group consisting of polyimides, polyoxazolidones, polysulfones and polyphenyl oxides.

Claim 16

In a sheet drawing machine comprising a drawing kiln and thereabove an enclosed cooling chamber comprising a kiln portion, a lehr portion and a conveying and cooling portion, each having traction rolls therein, the improvement comprising, in said kiln portion and in said lehr portion, traction rolls, each comprising an asbestos roll body impregnated with alkaline earth metal sulfate, and, in said conveying and cooling portion, traction rolls, each comprising a roll body overlaid with an elastic material further overlaid with a heat resistant, thermosetting, organic polymer having an ignition and degradation temperature of above about 500*F. selected from the group consisting of polyimides, polyoxazolidones, polysulfones and polyphenyl oxides.

Claim 17

A traction roll for engaging glass, comprising: a roll body comprising a refractory material; a first layer of silicone rubber material surrounding said roll body; a second layer of a B-stage polyimide reinforced fiber glass cloth heat cured in place about said first layer; and a third layer of a polyimide impregnated asbestos cloth heat cured in place about said second layer.

Claim 18

A traction roll for engaging glass, comprising: a roll body comprising a refractory material; a first layer of silicone rubber material surrounding said roll body; a second layer of a B-stage polyimide reinforced fiber glass cloth heat cured in place about said first layer; and a third layer of a polyimide impregnated asbestos cloth heat cured in place about said second layer.

Claim 19

In a sheet drawing machine comprising a drawing kiln and thereabove an enclosed cooling chamber comprising a kiln portion, a lehr portion and a conveying and cooling portion, each having traction rolls therein, the improvement comprising, at least one pair of traction rolls each comprising a roll body comprising a refractory material and having a layer of heat resistant thermosetting organic polymer having an ignition and degradation temperature of above about 500*F. surrounding said roll body, said polymer being selected from the group consisting of polyimides, polyoxazolidones, polysulfones and polyphenyl oxides.

Claim 20

In a sheet drawing machine comprising a drawing kiln and thereabove an enclosed cooling chamber comprising a kiln portion, a lehr portion and a conveying and cooling portion, each having traction rolls therein, the improvement comprising, at least one pair of traction rolls each comprising a roll body comprising a refractory material and having a layer of heat resistant thermosetting organic polymer having an ignition and degradation temperature of above about 500*F. surrounding said roll body, said polymer being selected from the group consisting of polyimides, polyoxazolidones, polysulfones and polyphenyl oxides.

Claim 21

The improved sheet drawing machine as set forth in claim 12 wherein said layer includes: a first layer of silicone rubber material surrounding said roll body; a second layer of a B-stage polyimide reinforced fiber glass cloth heat cured in place about said first layer; and a third layer of a polyimide impregnated asbestos cloth heat cured in place about said second layer.

Claim 22

The improved sheet drawing machine as set forth in claim 13 wherein said first layer is a layer of silicone rubber; said second layer is at least one ply of bias-wrapped, fiber glass cloth reinforced B-stage polyimide cloth; and said third layer is at least one ply of polyimide impregnated asbestos cloth.