#AskGlaston Episode 47: Is it possible to eliminate the white stripe by lowering the speed of the furnace?

12.2.2019

This week, we are dealing with these three questions:

  1. Is it possible to eliminate the white stripe by lowering the line speed in the furnace to 50 mm per second? Also, what are the bad side effects of doing this?
  2. What is the recommended transfer speed from a furnace to chiller for 6-mm coated glass?
  3. What temperature do you recommend having your furnace at before stopping the rollers?

Is it possible to eliminate the white stripe by lowering the line speed in the furnace to 50 mm per second? Also, what are the bad side effects of doing this?

Yes, the lower line speed helps to reduce the white stripes. However, very accurate movement and heating control are needed to prevent localized glass temperature differences. Too slow line speed at the end of the heating cycle can increase roller wave and edge kink.

What is the recommended transfer speed from a furnace to chiller for 6-mm coated glass?

Typically, the recommended transfer speed for 6-mm coated glass is around 300–400 mm per second. Thinner glass needs faster transfer speed than the thick glass.

What temperature do you recommend having your furnace at before stopping the rollers?

To be sure that there is no material weakening of the rollers, we recommend that furnace temperature before stopping the rollers is about 300 °C.

 

 

Related posts:

  1. #AskGlaston Episode 20: How can I remove white haze?
  2. #AskGlaston Episode 37: Why does glass come out of a tempering furnace with very small dents on it?
  3. #AskGlaston Episode 48: How to avoid edge kink in tempered glass?
  4. #AskGlaston Episode 32: How can we reduce the noise level of our flat glass tempering line?

Want to know more?

Sign up for Glastory newsletter

Share this story

About the author

Taneli Ylinen

As Product Manager of Flat Tempering at Glaston, Taneli is an enthusiastic developer. He enjoys brainstorming and seeing abstract ideas turn into real-world innovations and products that benefit customers and fulfill emerging market needs. He’s a Master of Engineering who spends most of his free time inside a garage working on the next big breakthrough. He has other hidden talents, too. Taneli once played a well-known character on a famous Finnish children’s TV show.

Related posts:

  1. #AskGlaston Episode 20: How can I remove white haze?
  2. #AskGlaston Episode 37: Why does glass come out of a tempering furnace with very small dents on it?
  3. #AskGlaston Episode 48: How to avoid edge kink in tempered glass?
  4. #AskGlaston Episode 32: How can we reduce the noise level of our flat glass tempering line?