Apparatus for coating glass sheet ribbon

• US 5,762,674 A
• Filed: 09/27/1995
• Issued: 06/09/1998
• Est. Priority Date: 09/27/1995
• Status: Expired due to Term

• Current Assignee: Glasstech Incorporated
• Original Assignee: Glasstech Incorporated
• Inventors: Vild, Michael J., Maltby, Robert J. Jr., Wetmore, Kenneth H.
• Primary Examiner(s): Czaja, Donald E.
• Assistant Examiner(s): Ruller, Jacqueline A.
• Application Number:
  US08/534,404
• Time in Patent Office: 986 Days
• Field of Search: 65/182.1, 65/182.2, 65/182.3, 65/193, 65/99.1, 65/99.2, 65/60.1
• US Class Current: 65/60.1
• CPC Class Codes: C03B 18/16 Construction of the float tank; Use of material for the float tank; Coating or protection of the tank wall
• CPC Class Codes: C03B 35/147 of the non-contact type
• CPC Class Codes: C03B 35/246 Transporting continuous glass ribbons
• CPC Class Codes: C03C 17/002 for flat glass, e.g. float glass
• CPC Class Codes: C03C 17/3417 all coatings being oxide coatings
• CPC Class Codes: C03C 2217/211 SnO2
• CPC Class Codes: C03C 2218/15 from the vapour phase
• CPC Class Codes: C03C 2218/36 Underside coating of a glass sheet
• CPC Class Codes: C03C 2218/365 Coating different sides of a glass substrate

Abstract

Forming apparatus (22) and a method for forming a glass sheet ribbon G delivered from a float tank (44) to a topside support device (74) having a downwardly facing surface to which a vacuum and pressurized gas are supplied to support the glass sheet ribbon (G) at its upper surface (52) while a coater (78) applies a coating (80) to its lower surface (54). Another coater (86) applies a coating (88) to the upper surface (52) of the glass sheet ribbon G. A coated glass sheet (32) cut from the glass sheet ribbon G has at least one surface, and as disclosed both of its surfaces (52,54), coated so as to be protected from deterioration caused by exposure to the atmosphere.

Claims

1. Glass sheet ribbon forming apparatus, comprising:

a float tank for receiving a bath of molten metal on which a newly formed glass sheet ribbon is floated and conveyed along a generally horizontal direction of conveyance for delivery from the float tank in a generally horizontal direction with upper and lower surfaces thereof respectively facing upwardly and downwardly;

a topside support device having a downwardly facing surface to which a vacuum and pressurized gas are supplied to support the glass sheet ribbon from above at the upper surface thereof downstream from the float tank; and

a coater for applying a coating to the lower surface of the glass sheet ribbon while the upper surface thereof is supported by the topside support device.

2. Glass sheet ribbon forming apparatus as in claim 1 wherein the coater is located directly below the topside support device.

3. Glass sheet ribbon forming apparatus as in claim 1 further including a conveyor that supports the glass sheet ribbon from below at a location spaced from the topside support device along the direction of conveyance, and a second coater for applying a coating to the upper surface of the glass sheet ribbon while supported from below by the conveyor.

4. Glass sheet ribbon forming apparatus as in claim 3 wherein the conveyor is a gas hearth conveyor for supplying an upward gas flow that supports the glass sheet ribbon from below.

5. Glass sheet ribbon forming apparatus as in claim 4 wherein the second coater is located directly above the gas hearth conveyor.

6. Glass sheet ribbon forming apparatus, comprising:

a float tank for receiving a bath of molten metal on which a newly formed glass sheet ribbon is floated and conveyed along a generally horizontal direction of conveyance for delivery from the float tank in a generally horizontal direction with upper and lower surfaces thereof respectively facing upwardly and downwardly;

a topside support device having a downwardly facing surface to which a vacuum and pressurized gas are supplied to support the glass sheet ribbon from above at the upper surface thereof downstream from the float tank;

a first coater that is located directly below the topside support device and that applies a coating to the lower surface of the glass sheet ribbon while the upper surface thereof is supported by the topside support device;

a gas hearth conveyor for supplying an upward gas flow that supports the glass sheet ribbon from below at a location spaced from the topside support device along the direction of conveyance; and

a second coater that is located directly above the gas hearth and that applies a coating to the upper surface of the glass sheet ribbon while supported from below by the gas hearth conveyor.