Misplaced Pages

Wrinkle-resistant or permanent press or durable press is a finishing method for textiles that avoids creases and wrinkles and provides a better appearance for the articles. Most cellulosic fabrics and blends of cellulosic-rich fabrics tend to crease or wrinkle. A durable press finish makes them dimensionally stable and crease-free. The finishing includes chemical finishing as well as mechanical finishing. Wrinkle-resistant finishes were developed in the early 20th century as a way to deal with fabrics derived from cotton, rayon, and linen, which were found to wrinkle easily and retain the wrinkles. These treatments have a lasting effect on the fabric. Synthetics like polyester, nylon, acrylic, and olefin have a natural resistance to wrinkles and a greater stability since they do not absorb water as efficiently.

These fabrics are textiles that have been treated to resist external stress and hold their shape. Clothing made from this fabric does not need to be ironed and may be sold as non-iron, no-iron, wash-and-wear, durable press, and easy care. While fabric cleaning and maintenance may be simplified, some wearers experience decreased comfort.

History

Advances in producing permanent press fabrics involved a series of agents that crosslink the cellulose-based fibers that comprise most clothing. Wrinkle resistant treatments have been used since 1929, when cotton fabrics were treated with a solution of urea and formaldehyde. The chemical treatment stiffened the fabric, thus making it wrinkle-resistant.

Starting in the 1940s, a series of urea-formaldehyde derivatives were introduced. Technical issues overcome included yellowing, odor, and the tendency of some agents to accelerate the degradation of fabrics by bleaches.

By the 1950s, fabrics made from synthetics and treated cotton were described as "wash-and-wear" to point out that there was no need to iron them. The claim was thought somewhat dubious in the sense that they could require some touch-up ironing. In 1953, Brooks Brothers manufactured wash-and-wear shirts using a blend of Dacron, polyester, and a wrinkle-free cotton that was invented by Ruth R. Benerito, which they called "Brooksweave".

In the 1960s and 1970s, the developments in the chemistry of textile-treatments led to the discovery of DMDHEU, a chemical agent that made possible a low-cost but superior-quality production of permanent-pressed fabrics, which are now known as durable-pressed finishes. However, these processes weakened clothes; as a result, they wore out faster.

The technology advanced especially rapidly in the early 1990s.

Wrinkle-resistant fabrics, alongside other factors, have reportedly caused a decline in ironing in the United States.

Process

Cross-linking is the chemical process to produce textiles with wrinkle resistance. Wrinkle resistance is achieved by the crosslinking of cellulose chains to stop the molecules from moving when in contact with water or other environmental stress. Cotton cellulose polymer comprises three different regions: the crystalline region, the amorphous region, and an intermediate region between them. Although in the crystalline region the cellulose chains are closely arranged, limiting their mobility, chains in the amorphous and intermediate regions are bonded together by weaker bonds making them more susceptible to breaking. There are two types of crosslinkers, which are the chemicals that bond together cellulose chains, the first ones only bond cellulose chains, while the second self-polymerize resins as well.

Compounds baring N-methylol groups, such as dimethylol ethylene urea (DMEU) and the related Dimethylol dihydroxyethylene urea (DMDHEU), are commonly used for the treatments because of their relatively low costs; however, they produce free formaldehyde, which has been identified as a potential human carcinogen, and it can also cause harmful dermatological effects. The use of titanium dioxide (TiO₂) (as a catalyst/ co-catalyst for these reactions) has become an alternative way to minimize the formation of free formaldehyde and fabric strength loss.

DMDHEU is the most commonly used durable-press finish. In this process, the chemical is first applied to the fabric. Then the fabric is heated to allow the chemicals to react with the cellulose molecules. In the reaction, the molecules of the fabric are bonded together to keep them from moving and causing wrinkles. For this reason, durable-press treated garments behave as synthetics. However, almost all the wrinkle resistant garments are made with poly/cotton blends fabrics.

There are problems with the post-curing process, the final step of the treatment, because if the process is not done perfectly the garment gets damaged and can even turn yellow. Companies have overcome the post-curing issues by producing wrinkle-resistant clothes using pre-cured fabrics.

Chemistry

The crosslinking agents that result in the permanent press finish are often derivatives of urea. Popular crosslinkers include DMDHEU (dimethylol dihydroxyethyleneurea) and DMEU (dimethylol ethylene urea).

Washing and drying machines

In older washing machines, the permanent press setting sprays moisture during the spin cycle to maintain the moisture content of the permanent press fabrics above a certain specified limit to reduce wrinkling. Most older clothes dryers feature an automatic permanent press setting, which puts clothes through a cool-down cycle at the end of the normal heated drying cycle. Modern dryers tend to include this as a standard feature.

Another solution

In the 2000s, wrinkle-reduction sprays were launched to provide more resistance to external stress and wrinkle recovery, which can be improved by spraying fabrics with aqueous emulsions made with vegetable oils. The sprays allow the fibers to slide closer to each other, helping them hold their shapes. Moreover, this process is cheaper and simpler, minimizing chemical waste and water/energy consumption. The more effective anti-wrinkle sprays have higher concentrations of vegetable oils that are low in unsaturated fatty acids.

References

1. "Durable Press Finish - an overview | ScienceDirect Topics". www.sciencedirect.com. Retrieved 2022-01-03.
2. ^ Pollack, Andrew (29 December 1993). "BUSINESS TECHNOLOGY; A Dream Unfolds for Cotton Shirts". The New York Times.
3. ^ Collier, Billie J. (2004-11-30). "Performance Finishes". Encyclopedia of Clothing and Fashion (PDF). Vol. 3. p. 32.
4. Bernard, Tara Siegel (10 December 2010). "When Wrinkle-Free Clothing Also Means Formaldehyde Fumes". The New York Times.
5. Fenner, Justin (2016-05-09). "Non-Iron Dress Shirts Are the Worst". GQ. Retrieved 2018-08-21.
6. Colman, David (3 April 2015). "Behold, the Non-Iron Shirt". The New York Times.
7. Epaminondas, George (2016-05-04). "The War Over Non-Iron Shirts". Wall Street Journal. ISSN 0099-9660. Retrieved 2018-08-21.
8. "Chemistry and nanotech work to make carefree clothing". Usatoday.Com. 2004-12-31. Retrieved 2019-04-30.
9. Helmenstine, Anne Marie (February 11, 2020). "Do You Know Why Clothes Wrinkle?". ThoughtCo.
10. ^ Yin Ling Lam; Chi Wai Kan; Chun Wah Yuen (24 June 2011). "Wrinkle-resistant finishing with dimethyloldihydroxyethyleneurea (DMDHEU) — the effect of co-catalyst". Textile Research Journal. 81 (14): 1419–1426. doi:10.1177/0040517510387206. S2CID 209344183.
11. ^ DeWitt, John W. (March 1994). "Wrinkle-resistant redux". Apparel Industry Magazine. 55 (3): 22. ProQuest 215439347.
12. Tracey, David (20 February 1995). "Dressing for Duress: No Wrinkles or Odors". International Herald Tribune. Archived from the original on 28 October 2005.
13. Koncius, Jura (2019-05-14). "No, millennials didn't 'kill' ironing. But there is a wrinkle for iron makers". Washington Post.
14. "Creating 'greener' wrinkle-resistant cotton fabric" (Press release). American Chemical Society. January 27, 2016. Retrieved July 23, 2020.
15. ^ Dong, Hao (2015). Formaldehyde-Free Wrinkle Resistant Treatment of Cotton Fabrics with Novel Aromatic Polycarboxylic Acids (Thesis). ProQuest 1738859748.
16. ^ Stefanovic, Bojan; Kostic, Mirjana; Bacher, Markus; Rosenau, Thomas; Potthast, Antje (15 July 2013). "Vegetable oils in textile finishing applications: the action mode of wrinkle-reduction sprays and means for analyzing their performance". Textile Research Journal. 84 (5): 449–460. doi:10.1177/0040517513495946. S2CID 98346981.
17. ^ Greco, Monica (October 1995). "Do WR shirts have a real future?". Apparel Industry Magazine. 56 (10): 40. ProQuest 215438740.
18. Fischer, Klaus; Marquardt, Kurt; Schlüter, Kaspar; Gebert, Karlheinz; Borschel, Eva-Marie; Heimann, Sigismund; Kromm, Erich; Giesen, Volker; Schneider, Reinhard; Wayland, Rosser Lee (2000). "Textile Auxiliaries". Ullmann's Encyclopedia of Industrial Chemistry. American Cancer Society. doi:10.1002/14356007.a26_227. ISBN 978-3-527-30673-2.
19. "Permanent press cycle for automatic washer - Whirlpool Corporation". Freepatentsonline.com. Retrieved 2019-04-30.

External links

• The dictionary definition of Permanent press at Wiktionary

• Textiles