Featured Research

from universities, journals, and other organizations

The Crack As A Tool: New Process Cut Brittle Glass Super-sharp

Date:
June 3, 2008
Source:
Fraunhofer-Gesellschaft
Summary:
We encounter glass everywhere -- as window and facade glazing, coffee-table tops and shelving. A new process makes it possible to cut the brittle material cost-efficiently and opens up new applications thanks to superior edge quality.

Dr. Rainer Kübler developed the LiST process -- a laser-induced stress separation process for flat glass.
Credit: Copyright Fraunhofer/Kai-Uwe Nielsen

We encounter glass everywhere – as window and facade glazing, coffee-table tops and shelving. A new process makes it possible to cut the brittle material cost-efficiently and opens up new applications thanks to superior edge quality.

Glass is a versatile, popular material for a wide range of applications. Cutting the glass is key to obtaining high-quality products. In the conventional process used to cut flat glass, a small cutter wheel scores a line into the glass. Pressure is then applied to the glass along this line so that it breaks. Unfortunately, glass splinters may come off in the process, producing defects known as micro-cracks. The glass consequently needs to be reworked by grinding and polishing, which costs time and money. Nonetheless, damages may remain in the glass that reduce its strength.

A great deal of time and money, limited design options – reason enough to develop a better, more effective process for separating glass. In a project funded by the Federal Ministry of Education and Research (BMBF), Dr. Rainer Kübler has been working with his five-strong team on a laser-induced stress separation process for flat glass that causes minimal damage. Dr. Rainer Kübler has been awarded the Joseph-von-Fraunhofer Prize 2008 for his work.

So what do the Fraunhofer scientists do that is different? Instead of scoring the glass mechanically, they do it by applying stress. “We have to heat the glass along the required separation line without damaging it,” explains Dr. Kübler. “We do it with a CO2 laser.”

The second part of the secret is to shock-cool the glass by means of a cooling nozzle following right behind the laser beam, blowing cold air onto a specific area of the glass. The temperature difference creates a stress field and, in turn, a crack. Then the thermal crack introduced into the surface by this process is opened by bending the glase plate until it separates. Extensive experience and numerical simulation have helped to manage the process and particularly the crack – to produce the crack in a controlled manner and use it as a tool.

“Our process has enabled us to produce extremely high-quality glass edges. And flawless, smooth edges mean firmer glass,” says Dr. Kübler. The stability of the edges determines the strength of the entire pane.

All of this opens up entirely new applications for the use of glass panes in architecture. Thanks to the flawless edges, the installed glass panes can be made thinner without sacrificing any of their reliability. And Grenzebach, the development partner, is a global player in glass production technology, providing the new process with ready access to a global market.

 


Story Source:

The above story is based on materials provided by Fraunhofer-Gesellschaft. Note: Materials may be edited for content and length.


Cite This Page:

Fraunhofer-Gesellschaft. "The Crack As A Tool: New Process Cut Brittle Glass Super-sharp." ScienceDaily. ScienceDaily, 3 June 2008. <www.sciencedaily.com/releases/2008/05/080529105403.htm>.
Fraunhofer-Gesellschaft. (2008, June 3). The Crack As A Tool: New Process Cut Brittle Glass Super-sharp. ScienceDaily. Retrieved April 25, 2014 from www.sciencedaily.com/releases/2008/05/080529105403.htm
Fraunhofer-Gesellschaft. "The Crack As A Tool: New Process Cut Brittle Glass Super-sharp." ScienceDaily. www.sciencedaily.com/releases/2008/05/080529105403.htm (accessed April 25, 2014).

Share This



More Matter & Energy News

Friday, April 25, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

Next Stop America for France's TGV?

Next Stop America for France's TGV?

Reuters - Business Video Online (Apr. 24, 2014) — General Electric keeps quiet on reports it's in talks to buy French turbine and train maker Alstom. Ivor Bennett reports on what could be an embarrassing rumour for the French government, with business-friendly reforms proving a hard sell. Video provided by Reuters
Powered by NewsLook.com
Raw: Obama Plays Soccer With Japanese Robot

Raw: Obama Plays Soccer With Japanese Robot

AP (Apr. 24, 2014) — President Obama briefly played soccer with a robot during his visit to Japan on Thursday. The President has been emphasizing technology along with security concerns during his visit. (April 24) Video provided by AP
Powered by NewsLook.com
Obama Encourages Japanese Student-Scientists

Obama Encourages Japanese Student-Scientists

AP (Apr. 24, 2014) — President Obama spoke with student innovators in Japan and urged them to take part in increased opportunities for student exchanges with the US. (April 24) Video provided by AP
Powered by NewsLook.com
UN Joint Mission Starts Removing Landmines in Cyprus

UN Joint Mission Starts Removing Landmines in Cyprus

AFP (Apr. 23, 2014) — The UN mission in Cyprus (UNFICYP) led a mine clearance demonstration on Wednesday in the UN-controlled buffer zone where demining operations are being conducted near the Cypriot village of Mammari. Duration: 01:00 Video provided by AFP
Powered by NewsLook.com

Search ScienceDaily

Number of stories in archives: 140,361

Find with keyword(s):
 
Enter a keyword or phrase to search ScienceDaily for related topics and research stories.

Save/Print:
Share:  

Breaking News:
from the past week

In Other News

... from NewsDaily.com

Science News

Health News

Environment News

Technology News



Save/Print:
Share:  

Free Subscriptions


Get the latest science news with ScienceDaily's free email newsletters, updated daily and weekly. Or view hourly updated newsfeeds in your RSS reader:

Get Social & Mobile


Keep up to date with the latest news from ScienceDaily via social networks and mobile apps:

Have Feedback?


Tell us what you think of ScienceDaily -- we welcome both positive and negative comments. Have any problems using the site? Questions?
Mobile iPhone Android Web
Follow Facebook Twitter Google+
Subscribe RSS Feeds Email Newsletters
Latest Headlines Health & Medicine Mind & Brain Space & Time Matter & Energy Computers & Math Plants & Animals Earth & Climate Fossils & Ruins