Isopipe with curb at the compression end and method for forming a glass ribbon

A fusion draw machine comprising a forming body comprising:

• an upper trough-shaped portion comprising two trough walls and a trough bottom, the upper trough-shaped portion defining a trough that is bounded by the two trough walls and the trough bottom, the trough configured to receive molten glass between the two trough walls and on the trough bottom;
• a lower wedge-shaped portion;
• a delivery end configured to receive the molten glass;
• a compression end comprising a curb;
• and a diverter positioned within the trough in contact with the trough bottom and between the two trough walls, the diverter comprising a width spanning a distance between the two trough walls of the upper trough-shaped portion;
• and an end cap coupled to the compression end and extending over the curb, wherein a height of the curb is greater than a height of the two trough walls at the compression end, the diverter attached to the end cap;
• wherein the diverter is attached to an auxiliary plate attached to the end cap, further wherein upper surfaces of the two trough walls extend along a plane, a first portion of the diverter located on a first side of the plane and a second portion of the diverter located on an opposing second side of the plane.

A method for producing a glass ribbon, comprising:

• melting batch materials to form molten glass;
• and
• introducing the molten glass into an apparatus comprising:
• a forming body comprising:
• an upper trough-shaped portion comprising two trough walls and a trough bottom, the upper trough-shaped portion defining a trough that is bounded by the two trough walls and the trough bottom, the trough configured to receive the molten glass between the two trough walls and on the trough bottom;
• a lower wedge-shaped portion comprising two opposing outer surfaces converging at a root;
• a delivery end configured to receive the molten glass;
• and
• a compression end comprising a curb;
• and
• an end cap coupled to the compression end and extending over the curb, wherein a height of the curb is greater than a height of the two trough walls at the compression end;
• and
• directing the molten glass out of the upper trough-shaped portion and over the two trough walls with a diverter positioned within the trough in contact with the trough bottom and between the two trough walls;
• wherein the diverter is attached to an auxiliary plate attached to the end cap.

An apparatus for producing a glass ribbon, comprising:

• a forming body comprising:
• an upper trough-shaped portion comprising two trough walls and a trough bottom;
• a lower wedge-shaped portion;
• a delivery end configured to receive molten glass;
• a compression end comprising a curb;
• and
• a diverter positioned on the trough bottom between the two trough walls, the diverter forming an angle relative to the trough bottom within a range from about 2° to about 4°;
• and
• an end cap coupled to the compression end and extending over the curb,
• wherein a height of the curb is greater than a height of the two trough walls at the compression end.