Featured Research

from universities, journals, and other organizations

Textile Industry Could Get A "Charge" Out Of Greener Dyeing Process

Date:
August 23, 2001
Source:
North Carolina State University
Summary:
A textile scientist at North Carolina State University is developing a more efficient method of dyeing cotton that is not only less harmful to the environment, but also uses significantly smaller amounts of energy, water and salt in the dyeing process.

A textile scientist at North Carolina State University is developing a more efficient method of dyeing cotton that is not only less harmful to the environment, but also uses significantly smaller amounts of energy, water and salt in the dyeing process.

The key to the new process, called cationic fiber modification, is treating the cotton with a chemical that gives it a positive charge that attracts negatively charged dyes.

"The new process is much more efficient and saves about half of the time normally required to dye cotton. It uses one-third of the energy and only 20 percent of the water used in traditional methods, and no salt," said Dr. Peter Hauser, associate professor of textile engineering, chemistry and science.

Traditionally, cotton is dyed using water-soluble dyes, but these compounds don't naturally adhere well to cotton, so large amounts of salt must also be added to the mix to make the dye less soluble and better at adhering. The amount of salt needed sometimes approaches ratios of 1-to-1 by weight of the fabric. Large amounts of water are also needed -- it takes eight gallons of water to dye one pound of fabric.

In cationic fiber modification, a chemical called N-(3-chloro-2-hydroxypropyl) trimethylammonium chloride is applied to the cotton before it is dyed. The chemical gives the cotton fiber a permanent positive electrical charge, which strongly attracts the negatively charged dyes. All cotton dyes have negative electrical charges.

As a result of the electrical attraction, less dye is needed, Hauser says, and the colors in the fabric appear to be more vivid. There is no noticeable change in the texture of the cotton fiber.

Another benefit of the new process, he says, is that it can be done using standard dyeing and finishing machines, so manufacturers don't have to retool their operations.

Hauser is now focusing his research on how to streamline the new process even further. Currently, he says, one drawback is that the fabric has to be taken out of the manufacturing line to have the chemical applied. Then it must be given time to react with the chemical. This extra step significantly slows the process of dyeing and finishing, which are best completed as one uninterrupted process.

Hauser is working to overcome that problem, but the biggest hurdle may be convincing industry to embrace the new process.

"The textile industry is very slow to adopt change, (especially on) something like this that mainly reduces pollution and energy consumption. There's been some interest in this, but so far commercialization has been slow," Hauser said. "This is going to be driven by the people who need to reduce pollution from their plant, or want to save energy or double their production capacity without buying more equipment."

Hauser's research is sponsored, in part, by Dow Chemical Co., the manufacturer of the chemical that gives the cotton a positive charge.


Story Source:

The above story is based on materials provided by North Carolina State University. Note: Materials may be edited for content and length.


Cite This Page:

North Carolina State University. "Textile Industry Could Get A "Charge" Out Of Greener Dyeing Process." ScienceDaily. ScienceDaily, 23 August 2001. <www.sciencedaily.com/releases/2001/08/010823084131.htm>.
North Carolina State University. (2001, August 23). Textile Industry Could Get A "Charge" Out Of Greener Dyeing Process. ScienceDaily. Retrieved October 23, 2014 from www.sciencedaily.com/releases/2001/08/010823084131.htm
North Carolina State University. "Textile Industry Could Get A "Charge" Out Of Greener Dyeing Process." ScienceDaily. www.sciencedaily.com/releases/2001/08/010823084131.htm (accessed October 23, 2014).

Share This



More Matter & Energy News

Thursday, October 23, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

3D Printed Instruments Make Sweet Music in Sweden

3D Printed Instruments Make Sweet Music in Sweden

Reuters - Innovations Video Online (Oct. 23, 2014) Students from Lund University's Malmo Academy of Music are believed to be the world's first band to all use 3D printed instruments. The guitar, bass guitar, keyboard and drums were built by Olaf Diegel, professor of product development, who says 3D printing allows musicians to design an instrument to their exact specifications. Matthew Stock reports. Video provided by Reuters
Powered by NewsLook.com
Chameleon Camouflage to Give Tanks Cloaking Capabilities

Chameleon Camouflage to Give Tanks Cloaking Capabilities

Reuters - Innovations Video Online (Oct. 22, 2014) Inspired by the way a chameleon changes its colour to disguise itself; scientists in Poland want to replace traditional camouflage paint with thousands of electrochromic plates that will continuously change colour to blend with its surroundings. The first PL-01 concept tank prototype will be tested within a few years, with scientists predicting that a similar technology could even be woven into the fabric of a soldiers' clothing making them virtually invisible to the naked eye. Matthew Stock reports. Video provided by Reuters
Powered by NewsLook.com
Jet Sales Lift Boeing Profit 18 Pct.

Jet Sales Lift Boeing Profit 18 Pct.

Reuters - Business Video Online (Oct. 22, 2014) Strong jet demand has pushed Boeing to raise its profit forecast for the third time, but analysts were disappointed by its small cash flow. Fred Katayama reports. Video provided by Reuters
Powered by NewsLook.com
Internet of Things Aims to Smarten Your Life

Internet of Things Aims to Smarten Your Life

AP (Oct. 22, 2014) As more and more Bluetooth-enabled devices are reaching consumers, developers are busy connecting them together as part of the Internet of Things. (Oct. 22) 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