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Glass Wool: Steam-Blown from an Electrically Reheated Glass Stream (Slayter, US 2,133,235)
Very fine glass wool needs very hot glass at the blower, but a stream loses heat on its way out of the furnace. Games Slayter of Owens-Illinois (filed 1933, US 2,133,235) reheated the stream as it left: it runs through a silicon-carbide element lined with platinum, then a steam blast draws it into fine filaments, which a conveyor carries under a roll that presses them into a loose mat.
Not given: the glass, any temperature, the current, the steam pressure and the sizes.
Source: G. Slayter, US 2,133,235 (1938), Figs. 1-4. Picture: his Fig. 1.
Advanced
Continuous (industrial)
Instructions
1
1
Melt and refine the glass
Melt and refine the glass
Melt and refine the glass in the furnace's tank, which feeds the forehearth continuously.
Materials for this step:
Unknown Glass1 continuous feedTools needed:
Glass Melting Furnace2
2
Feed it to the bushing
Feed it to the bushing
The refined glass flows along the forehearth, an extension of the furnace, to a well in its floor. A refractory bushing is held under the well by a ring. Raise or lower the refractory plug in the glass above the bushing to set the flow.
Tools needed:
Forehearth
Heat-Resistant Gloves3
3
Reheat the stream
Reheat the stream
The bushing carries a silicon-carbide element (Slayter used "Globars") with a hole through its middle and an arm on each side, cabled to terminals. A layer of platinum spun onto the inner surface keeps the glass off the element. Pass current through the element and the platinum: the glass is heated again as it runs through the hole, so it reaches the blower hot enough to blow very fine wool without overheating the forehearth.
Tools needed:
Silicon Carbide Heated Bushing
Step-Down Transformer4
4
Blow it into filaments
Blow it into filaments
Let the stream fall through a steam blower fed with steam by a pipe. The blast draws the glass out into fine filaments.
Tools needed:
Steam Blower
Steam Boiler
Safety Glasses5
5
Collect a loose mat
Collect a loose mat
The filaments gather on a conveyor, which carries them under a roll that presses the wool into a loose mat.
Tools needed:
Industrial Conveyor Belt
Compression RollMaterials
1- 1 continuous feedPlaceholder
Tools Required
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