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What is Glass?

For discussion and commentary regarding the Lesson and Project videos of the Bullseye Kiln-Glass Education Online program.

What is Glass?

Postby Chris_Petrauskas » Fri Nov 11, 2011 6:12 pm

Watch the Lesson at:
https://videos.bullseyeglass.com/videos/what-is-glass/

Please discuss and comment in this thread.

Thanks!
Chris Petrauskas
Bullseye Glass Co.
Portland, Oregon, USA
http://www.bullseyeglass.com
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Re: What is Glass?

Postby ggrata » Mon Mar 17, 2014 3:49 pm

How is it that BE can go from furnace to room temp in 45 minutes without the usual anneal cooling period as in when fusing?
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Re: What is Glass?

Postby marykaynitchie » Tue Mar 18, 2014 9:11 am

Excellent question!

This is because the sheets go on a conveyer mesh belt through a series of ovens with specific temperatures (gradually progressing from hot to warm) with air blowing evenly around the entire sheet, so that the temperature of the sheet is as uniform as possible throughout. (This long long tunnel of ovens is called a "lehr", pronounced like "lair" (or "layer", if you are from the South of the United States).

In contrast to this, in a stationary kiln, there is no blower, so the glass is more likely to stay hot on the insides and shelf side of the sheet compared to the edges and the top side. This temperature differential creates stress. To counteract this tendency, in a stationary kiln, the glass needs to progress through the different temperatures at a much slower rate than in the lehr.

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Re: What is Glass?

Postby ggrata » Tue Mar 18, 2014 9:33 am

Thanks Mary Kay.... that makes sense. Is 6 mm glass run through the same lehr?
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Re: What is Glass?

Postby marykaynitchie » Thu Mar 20, 2014 4:38 pm

Yes, it is.

MK
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Re: What is Glass?

Postby Eolane » Sun Mar 06, 2016 9:14 am

I was disappointed in that the visuals on the video vanished once we got to the factory section. I noticed the visuals were working down the black screen. Essentially, they kept getting lower until all that was left is a black screen even though the audio continued. Is this intentional or is there something I need to do to get the visual back up on the black screen?
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Re: What is Glass?

Postby jestersbaubles » Mon Mar 07, 2016 11:19 am

This sounds more like an issue with your internet connection and buffering of the content (slow, poor connection).

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Re: What is Glass?

Postby ibby.caputo » Sun Jan 21, 2018 3:11 pm

What happens to the glass that, once inspected, is determined to be not compatible for fusing, etc.?
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Re: What is Glass?

Postby marykaynitchie » Mon Jan 22, 2018 2:53 pm

Glass that is not compatible for fusing is gets a non-compatible grade, and is sold for stained glass or mosaic applications. Thanks for asking!

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