Featured Research

from universities, journals, and other organizations

Deep cleaning with carbon dioxide

Date:
October 8, 2012
Source:
Fraunhofer-Gesellschaft
Summary:
In server components, hard disks, or clock mechanisms, the smallest impurities lead to malfunctions and short circuits; in optical components such as lenses, they impair quality because they scatter light; in threaded holes, they cause mechanical failure. The phenomena of progressive miniaturization and ever more complex components are presenting the manufacturers of cleaning technologies and tools with big challenges. However, cleaning with carbon dioxide (CO2) has proven itself an effective means of removing extremely fine dirt particles.

This cleaning tool removes even every fine dirt particles from areas inside components that are difficult to clean, for example boreholes and blind holes.
Credit: Copyright Fraunhofer IPA

In server components, hard disks, or clock mechanisms, the smallest impurities lead to malfunctions and short circuits; in optical components such as lenses, they impair quality because they scatter light; in threaded holes, they cause mechanical failure. The phenomena of progressive miniaturization and ever more complex components are presenting the manufacturers of cleaning technologies and tools with big challenges. However, cleaning with carbon dioxide (CO2) has proven itself an effective means of removing extremely fine dirt particles.

Related Articles


At the Fraunhofer Cleaning Technology Alliance booth, the Fraunhofer Institute for Manufacturing Engineering and Automation IPA is presenting a tool capable of completely removing processing residues from areas inside components that are difficult to clean, for example blind holes and boreholes. The tool was developed in the DeepClean collaborative project, where IPA researchers successfully combined different CO2 cleaning techniques in a single cleaning step: degreasing with supercritical CO2 and removing particles with CO2 snow crystals. "At a pressure from 74 bar upward and a temperature of 31 degrees Celsius, carbon dioxide changes into a new state, becoming supercritical.

In this state, it absorbs foreign matter such as oils and greases," explains IPA engineer Dr. Markus Rochowicz. Fitting the tool over the borehole hermetically seals the inside of the component. Then it is rinsed and degreased with supercritical CO2. When the cleaning tool is opened in the second stage of the process, CO2 snow is produced, and this removes particles from the component. The force of the CO2 snow crystals generated in the nozzle of the cleaning tool is so great that even the tiniest particles can be efficiently removed without damaging the cleaned surfaces. As the CO2 changes back from a solid to a gaseous state immediately after the cleaning, i.e. the snow crystals evaporate, the cleaned component stays completely dry -- an advantage with moisture-sensitive materials.

Cleaning laboratory open to outsiders for carrying out tests

The compact size of the cleaning nozzles not only means that the tool is suitable for manually cleaning components, it can also be integrated into very tight spaces in fully-automated assembly procedures -- for example in the auto industry, where it can be used to remove residues from the hydraulic system, the ABS, or the distribution block during the production process. The innovative tool also has benefits for other sectors: in medical engineering, for instance, where it can be used to clean endoscopes, cannulae, and the bases of dental implants. "The exhibit should also interest manufacturers from the semiconductor, pharmaceutical, optical goods, and aerospace sectors," anticipates Rochowicz. After the trade fair, the system will be available to companies for industrial cleaning tests in the IPA's highly specialized CO2 cleaning and analysis laboratories. The European Space Agency (ESA) has already used the laboratory infrastructure to look into ways of ensuring the absolute cleanliness of components for future missions to Mars.


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. "Deep cleaning with carbon dioxide." ScienceDaily. ScienceDaily, 8 October 2012. <www.sciencedaily.com/releases/2012/10/121008161808.htm>.
Fraunhofer-Gesellschaft. (2012, October 8). Deep cleaning with carbon dioxide. ScienceDaily. Retrieved November 23, 2014 from www.sciencedaily.com/releases/2012/10/121008161808.htm
Fraunhofer-Gesellschaft. "Deep cleaning with carbon dioxide." ScienceDaily. www.sciencedaily.com/releases/2012/10/121008161808.htm (accessed November 23, 2014).

Share This


More From ScienceDaily



More Matter & Energy News

Sunday, November 23, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

Microsoft Adds Robot Guards, Ushers In Sci-Fi Apocalypse

Microsoft Adds Robot Guards, Ushers In Sci-Fi Apocalypse

Newsy (Nov. 23, 2014) Microsoft has robotic security guards working at its Silicon Valley Campus. Video provided by Newsy
Powered by NewsLook.com
Toyota's Hydrogen Fuel-Cell Green Car Soon Available in the US

Toyota's Hydrogen Fuel-Cell Green Car Soon Available in the US

AFP (Nov. 21, 2014) Toyota presented its hydrogen fuel-cell compact car called "Mirai" to US consumers at the Los Angeles auto show. The car should go on sale in 2015 for around $60.000. It combines stored hydrogen with oxygen to generate its own power. Duration: 01:18 Video provided by AFP
Powered by NewsLook.com
Google Announces Improvements To Balloon-Borne Wi-Fi Project

Google Announces Improvements To Balloon-Borne Wi-Fi Project

Newsy (Nov. 21, 2014) In a blog post, Google said its balloons have traveled 3 million kilometers since the start of Project Loon. Video provided by Newsy
Powered by NewsLook.com
Raw: Paralyzed Marine Walks With Robotic Braces

Raw: Paralyzed Marine Walks With Robotic Braces

AP (Nov. 21, 2014) Marine Corps officials say a special operations officer left paralyzed by a sniper's bullet in Afghanistan walked using robotic leg braces in a ceremony to award him a Bronze Star. (Nov. 21) Video provided by AP
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:

Strange & Offbeat Stories


Space & Time

Matter & Energy

Computers & Math

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