US3488177A - Device for trapping floating matter which floats atop a float glass molten metal bath - Google Patents

Device for trapping floating matter which floats atop a float glass molten metal bath Download PDF

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Publication number
US3488177A
US3488177A US604803A US3488177DA US3488177A US 3488177 A US3488177 A US 3488177A US 604803 A US604803 A US 604803A US 3488177D A US3488177D A US 3488177DA US 3488177 A US3488177 A US 3488177A
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US
United States
Prior art keywords
bath
molten metal
floating matter
pocket
metal bath
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US604803A
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English (en)
Inventor
Kiyoshi Itakura
Mamoru Hoshino
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nippon Sheet Glass Co Ltd
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Nippon Sheet Glass Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Nippon Sheet Glass Co Ltd filed Critical Nippon Sheet Glass Co Ltd
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Publication of US3488177A publication Critical patent/US3488177A/en
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Classifications

    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B18/00—Shaping glass in contact with the surface of a liquid
    • C03B18/02—Forming sheets
    • C03B18/18—Controlling or regulating the temperature of the float bath; Composition or purification of the float bath

Definitions

  • This invention relates to a device for trapping floating matter in an apparatus for manufacturing a glass ribbon, an apparatus wherein the glass is advanced over a bath of molten metal, and particularly to a device for trapping floating matter which floats atop the molten metal bath.
  • the object of this invention is to provide for the manufacture of sheet glass of good quality by eliminating the floating matter from the molten metal bath employed in the manufacture of the glass ribbon.
  • the foregoing object is achieved by the following invention device by which floating matter which floats atop the molten metal bath is trapped.
  • the invention device for trapping floating matter which floats atop the molten metal bath in a glass ribbon manufacturing apparatus which advances the glass over a bath of molten metal has at least one pocket provided in the neighborhood of the exit to said molten metal bath and adjacent thereto, it being separated from the bath :by means of a partition, the top of which, in at least a part thereof, being lower than the level of molten metal and that part submerged in the molten metal having an opening through which the molten metal can pass.
  • FIG. 1 is a plan view of one embodiment of this invention
  • FIG. 2 being a side view in vertical section taken along line A-A of FIG. 1
  • FIG. 3 being a partially magnified view of FIG. 1
  • FIG. 4 being a side view in vertical section taken along line BB' of FIG. 3
  • FIGS. 5 and 6 being side views in cross-section taken along respective lines CC and D-D of FIG. 3.
  • molten glass 1 flows from a forehearth 2 of the melting furnace down a lip-tile 3 to become a glass ribbon 4 which then advances over a molten metal bath 5.
  • the glass ribbon which has been cooled and sufliciently solidified then leaves the molten metal bath and is conveyed by means of a roller conveyor 6.
  • the device comprising a pocket 8 and a partition 9 adapted to trap matter which floats atop the molten metal bath is provided in both side walls of the bath at a position adjacent to the exit 7 of the bath.
  • Pocket 8 of the molten metal bath is defined by a floor 11, which is an extension of floor 10 of the bath, a side wall 13 which continues from a side wall 12 of the aforesaid bath, a side wall 15, which continues or extends from an exit wall 14 of the bath, a ceiling 17, which extends from a ceiling 16 of the bath, and an end wall 18 interconnecting said side walls 13 and 15.
  • Partition 9 separates the molten metal bath 5 and the pocket 8 of the bath.
  • the upper part of the partition at a part 19 thereof near the exit of the molten metal bath is made to be little lower than the level of the molten metal so as to permit the floating matter of the main bath 5 to overflow into the pocket 8.
  • the partition has in that part which is submerged in the molten metal an opening 20 by which the molten metal can pass into the main bath 5 from the pocket 8.
  • An opening 21 is disposed between the end wall 18 and the ceiling 17, and the top edge of the end wall 18 is inclined downwardly towards the pocket.
  • the molten metal near the surface of the bath advances towards the exit of the bath along with the advancing glass ribbon and hits the exit wall of the bath, a part becoming a surface stream which flows along the exit wall and passes over the part 19 to How into the pocket of the molten metal bath.
  • a major portion of the floating matter which floats atop the molten metal bath rides this stream which heads towards the pocket to become trapped therein.
  • the molten metal which has entered the pocket passes through the opening 20 of the partition and returns to the main bath.
  • the floating matter which has once been trapped in the pocket does not return to the bath and hence gradually accumulates in the pocket. Before the pocket becomes full of the floating matter, it is skimmed out from the opening 21 via the top edge of the end wall.
  • the upper part of the partition in at least a part thereof is made slightly lower than the surface of the molten metal bath, but since the stream that proceeds towards the pocket is the faster the nearer it is to the bath exit, it is preferred that the upper part of the partition at that part thereof which is nearest to the bath exit is made lower, as shown in the drawings.
  • the opening in the partition should preferably be provided at a location which is as far away as possible from that part of the upper part of the partition which is made lower.
  • the length of the pocket 8 longitudinally of the molten metal bath should preferably be made as great as possible.
  • bath is disposed is not restricted to the position at the two side walls of the bath adjacent tothe exit thereof, as shown in the embodiment presented, but may be at any position so long as it is in the neighborhood of the bath exit. For instance, it may be disposed in the exit wall.
  • the device of this invention it becomes very easy to trap and remove the floating matter which floats atop the molten metal bath in the process which employs such a bath in the manufacture of glass ribbons, in consequence of which sheet glass not having surface defects can be obtained.
  • An apparatus for manufacturing glass ribbons by advancing the glass over a bath ofmolten metal comprising a main bath of molten metal means forming at least one pocket having floor, sidewalls, and end walls to receive molten metal from said main bath and floating matter which collects atop said molten metal, said pocket connected juxtaposed to said main bath in the area of the exit thereof; means defining an opening in one of said pocket walls for taking out the floating matter which has collected in said pocket; and a static partition which separates said main bath from said pocket having an upper edge part extending above the surface of said molten metal and having a lower edge part submerged in the molten metal bath; a portion of the upper edge part of said partition being lower than the level of the molten metal so as to facilitate the flow of the molten metal near the surface of the main bath into said pocket together with said floating matter, so that said metal and said floating matter pass atop said lower edge part which is disposed lower than the level of the main bath, and said static partition is provided with an opening, below said
  • An apparatus for manufacturing glass ribbons by advancing the glass over a bath of molten metal comprising means forming a main bath having a floor, or ceiling, side walls and end walls, one end wall being an exit wall; means forming two pockets to receive molten metal from the molten metal bath; said pockets disposed one each on both sides of said bath at the exit end thereof and adjacent to said main bath; said pockets each being defined by a first side wall projecting transversely from the side wall of-the main bath, a second side wall continuing from the exit wall of the main bath; an end wall interconnecting said first and second side walls; a pocket floor extending from the floor of the main bath, a pocket ceiling extending from the ceiling of the main bath, said floor and ceiling of the pocket interconnecting with the pocket Walls; means defining an opening being provided between said ceiling and said end wall of the pocket for taking out the floating matter which has accumulated in said pocket; static partitions in said molten metal which separate said main bath from and help define each of said pockets, said partitions having an uneven
  • a device according to claim 2 wherein the upper edge of the end wall of said pockets is inclined downwardly towards the inside of the bath.
  • a device wherein said static partitions are lateral of and parallel to the flow of the main metal bath; and wherein said second part of the upper edge of said static partitions is disposed downstream of the flow, and said opening below said first part of said static partitions is disposed upstream of said downstream second part.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Coating With Molten Metal (AREA)
  • Casting Support Devices, Ladles, And Melt Control Thereby (AREA)
  • Vertical, Hearth, Or Arc Furnaces (AREA)
US604803A 1966-01-17 1966-12-27 Device for trapping floating matter which floats atop a float glass molten metal bath Expired - Lifetime US3488177A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP225066 1966-01-17

Publications (1)

Publication Number Publication Date
US3488177A true US3488177A (en) 1970-01-06

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ID=11524095

Family Applications (1)

Application Number Title Priority Date Filing Date
US604803A Expired - Lifetime US3488177A (en) 1966-01-17 1966-12-27 Device for trapping floating matter which floats atop a float glass molten metal bath

Country Status (5)

Country Link
US (1) US3488177A (ko)
BE (1) BE692627A (ko)
DE (1) DE1596537C3 (ko)
ES (1) ES335716A1 (ko)
FR (1) FR1509348A (ko)

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3389983A (en) * 1963-07-23 1968-06-25 Pilkington Brothers Ltd Method and apparatus for removing dross from the surface of a molten metal glass sheet float bath

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3389983A (en) * 1963-07-23 1968-06-25 Pilkington Brothers Ltd Method and apparatus for removing dross from the surface of a molten metal glass sheet float bath

Also Published As

Publication number Publication date
DE1596537C3 (de) 1974-01-10
DE1596537A1 (de) 1971-03-04
BE692627A (ko) 1967-06-16
ES335716A1 (es) 1967-12-16
FR1509348A (fr) 1968-01-12
DE1596537B2 (de) 1973-06-07

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