Unit_3_-_Glass_Packaging (3)

Unit_3_-_Glass_Packaging (3) - The refiner receives the...

Info iconThis preview shows page 1. Sign up to view the full content.

View Full Document Right Arrow Icon
The glass furnace has multiple sections that include a melter, bridgewall, throat, and refiner, as well as one or more forehearths. The melter is the largest section, typically 50 ft long, 35 ft wide, and 6 ft deep, and is lined with fire brick which is a heat resistant ceramic. Here, the ingredient mix is exposed to heat and melted. Peak temperatures in the melter range from 2600-2900°F. The end of the melter is the “bridgewall”. The bridgewall, also referred to as a shadow wall, directs the molten glass to the “throat” underneath it. The throat is where the glass moves from the melter to the refiner. The bridgewall forces all glass passing through the throat to come from the bottom of the melter. This is because undesirable impurities in the glass float to the top, where they get trapped against the bridgewall. This floating mixture is referred to as “slag” and is usually composed of dirt, stones, and other foreign material that get into ingredients.
Background image of page 1
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: The refiner receives the glass as it passes through the throat. This glass is pure and the refiner performs the “fining” process and removes air bubbles by forcing them to float to the surface. Forehearths are ceramic lined troughs that convey glass from the refiner into glass container forming machines. The temperature of the glass is stabilized here so that it is the optimum temperature for forming containers. When glass enters the forehearth, it is about 2350°F and when it leaves it is about 2000°F. Colorant can also be added here, in addition to being added in the Batch House. Up to eight forehearths can be on one glass furnace, allowing each forehearth to design a different container simultaneously. Glass flows out of the forehearths through “feeders”, or “spouts”. Batch House...
View Full Document

{[ snackBarMessage ]}

Ask a homework question - tutors are online