Die For Producing Filaments, In Particular Glass Filaments And The Fibre Drawing System Thereof
A bushing for the manufacture of filaments, especially glass filaments including, on one of its faces a screen through which a molten material is intended to arrive via openings, and on its opposite face a bottom provided with plural orifices through which the molten material is intended to flow. A closure plate is attached and fastened to part of the total area of the screen.
1 - 11 . (canceled)
12 : A bushing for manufacture of filaments, comprising:
a screen on a first of the bushing face, through which a molten material is intended to arrive via openings;
a bottom on a second face opposite to the first face, the bottom provided with plural orifices through which the molten material is intended to flow; and
a closure plate attached and fastened to part of the surface of the screen at a point where a hottest stream of the molten material enters, the plate having a smaller area than the screen and having a shape matched to a shape of the hottest stream of the material.
13 : The bushing as claimed in claim 12 , wherein the plate is positioned to be offset relative to the overall surface of the screen.
14 : The bushing as claimed in claim 12 , wherein the plate is fastened to the first face of the screen which is intended to receive the incoming flow of the molten material.
15 : The bushing as claimed in claim 12 , wherein the plate is fastened at its periphery by welding at discrete points.
16 : The bushing as claimed in claim 15 , wherein the plate is fastened by a plurality of spot welds.
17 : The bushing as claimed in claim 15 , wherein the plate is fastened along at least two opposed lateral lines.
18 : The bushing as claimed in claim 12 , wherein the plate has a rectangular or oval or rhombic shape.
19 : The bushing as claimed in claim 12 , wherein the plate has a thickness of between 0.2 and 0.5 mm.
20 : The bushing as claimed in claim 12 , wherein the plate is made up of a same metal or alloy as that of the bushing.
21 : The bushing as claimed in claim 12 , wherein the plate is a solid plate or is pierced by orifices having diameters that differ from the openings in the screen.
22 : A fiberizing installation that includes a bushing as claimed in claim 12.