Patent ID: 9139462
Filing Date: 2015-09-22
Classification: C03B

Abstract:
1. A method of manufacturing a glass ribbon comprising the steps of: (I) providing a first pull roll apparatus including a first upstream pair of draw rolls and a second pull roll apparatus including a first downstream pair of draw rolls positioned downstream along a draw path from the first upstream pair of draw rolls; (II) forming a glass ribbon with a width extending between a first edge portion and a second edge portion; (III) operating the first pull roll apparatus such that at least one of the first upstream pair of draw rolls rotates to draw the first edge portion of the glass ribbon along the draw path; (IV) calculating a first downstream angular velocity of the at least one of the first downstream pair of draw rolls based on a first downstream equation including a predetermined diameter of the at least one of the first downstream pair of draw rolls and a predetermined ribbon velocity of the first edge portion of the glass ribbon downstream from the second pull roll apparatus; (V) operating the second pull roll apparatus such that the at least one of the first downstream pair of draw rolls rotates at the calculated first downstream angular velocity to further draw the first edge portion of the glass ribbon along the draw path at the predetermined ribbon velocity; (VI) monitoring an actual velocity of the first edge portion of the glass ribbon downstream from the second pull roll apparatus; and (VII) modifying the predetermined diameter in the first downstream equation based on the monitored actual velocity such that the predetermined ribbon velocity in the first downstream equation changes to substantially match the monitored actual velocity of the first edge portion of the glass ribbon downstream from the second pull roll apparatus without substantially changing the first downstream angular velocity.