Glass melting

• US 3,997,315 A
• Filed: 04/25/1975
• Issued: 12/14/1976
• Est. Priority Date: 04/26/1974
• Status: Expired due to Term

• Current Assignee: Pilkington Brothers Ltd (Nippon Sheet Glass Company Limited)
• Original Assignee: Pilkington Brothers Ltd (Nippon Sheet Glass Company Limited)
• Inventors: Rhodes, William Jackson, Marshall, Derek
• Primary Examiner(s): Lindsay, Jr., Robert L.
• Application Number:
  US05/571,822
• Time in Patent Office: 599 Days
• Field of Search: 65/135, 65/178, 65/179, 65/136
• US Class Current: 65/135.3
• CPC Class Codes: C03B 5/182 by moving the molten glass along fixed elements, e.g. deflectors, weirs, baffle plates
• CPC Class Codes: C03B 5/187 with moving elements
• CPC Class Codes: C03B 5/205 Mechanical means for skimming or scraping the melt surface

Abstract

In a glass melting tank stirrers are provided between the refining and conditioning zones. The stirrers extend side by side across the path of forward glass flow and are driven by a motor so that they rotate about vertical axes out of phase with each other.

Claims

1. A method of producing molten glass comprising feeding glass forming material to one end of a glass melting tank, melting the material in a melting zone of the tank, refining and conditioning the molten glass in refining and conditioning zones before discharging the molten glass from the other end of the tank to a forming process, and stirring the molten glass in its path to the point of discharge in a region of the tank where the upper region of the molten glass flows in a forward direction towards the working end and the lower region of the molten glass flows in a return direction towards the melting zone, the stirring being effected by rotating at least one pair of adjacent stirrers about substantially vertical axes spaced side-by-side across the direction of glass flow, operating each pair of stirrers by rotating them out-of-phase with each other, the stirrers being shaped to cause horizontal movement of the glass and substantially no vertical movement thereby effecting horizontal attenuation of the molten glass.

2. A method according to claim 1, wherein the stirring is effected by rotating at least three pairs of stirrers arranged side-by-side across the direction of flow, the two stirrers of each pair being rotated out-of-phase with each other.