Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

DuPont™ Hytrel® and DuPont™ Zytel® contribute to durable and lightweight all-plastic safety shoes

11.03.2008
Footwear and outerwear manufacturer Yakupoglu A.S. of Ankara, Turkey, uses DuPont™ Hytrel® thermoplastic polyester elastomer and DuPont™ Zytel® nylon to replace the metal eyelets and midsole support in its new durable and lightweight non-metallic safety shoes.

Hytrel® was selected for the shoe’s eyelets due to its flexibility, even at low temperatures, and its suitability for stitching to the leather upper. Zytel® was chosen for the shoe’s midsole support due to its high flexural modulus, helping to stiffen the polyurethane sole and provide more protection and comfort for the wearer. By changing to polymer components, Yakupoglu is able to save weight and manufacturing cost, while prolonging the lifetime of its shoes.


Photo: DuPont
For its new, non-metallic safety shoes, footwear manufacturer Yakupoglu A.S. uses flexible and stitchable DuPont™ Hytrel® thermoplastic polyester elastomer for the eyelets (top right and highlighted on shoe) and strong, stiff DuPont™ Zytel® nylon for its midsole support (pictured below, not visible on shoe as it is embedded in its sole).

The adoption of Hytrel® for the shoes’ eyelets and Zytel® for their midsole supports represented the final stage in Yakupoglu’s drive to replace metal in its safety shoes. “The availability of an all-polymer safety shoe can be of crucial significance to workers in industries where passing through metal detectors may be part and parcel of their jobs, for example luggage handlers at airports,” explains Ismail Harmandar, production manager at Yakupoglu. A reduction in the overall weight of the shoes, without impairing safety performance, and the elimination of potential corrosion sources are further benefits to the user. The manufacturing benefits of an all-polymer shoe include fewer material stocks and the deployment of cost-efficient manufacturing processes, according to Yakupoglu.

“The greatest challenge to date was finding a material to replace the steel commonly used for eyelets, where the right combination of flexibility and toughness over a wide temperature range was imperative in providing a durable component that could also be easily integrated into our overall production process. DuPont, and more specifically Hytrel®, provided that solution,” says Ismail Harmandar. Rows of four eyelets, measuring approximately eight centimetres in length and two centimetres high, are moulded in-house by Yakupoglu before being stitched to the leather upper by industrial sewing machines. “If the material is too stiff it will break during stitching, too soft and it may tear during use,” explains Ismail Harmandar further.

A 30% glass-reinforced grade of Zytel® nylon is used to produce the midsole support for the shoes, which runs under the arch of the foot above the polyurethane sole, and provides more protection and comfort for the wearer. The material was chosen for its high stiffness when flexed over multiple cycles, and processing ease. “The support provided by DuPont when determining which materials we could use for these applications was second to none. Whether material performance and analysis, processing advice or general design guidance, DuPont provided us with the best answers,” concludes Ismail Harmandar.

Part of Yakupoglu’s non-metallic range of safety footwear, the DuPont engineering thermoplastics currently feature in its UL 100 lightweight safety training shoe and the UL 110 lightweight safety boot. Both shoes are true non-metal constructions throughout, with the soles produced from a combination of polyurethane (PU) for the midsole and thermo-polyurethane (TPU) for the outsole. The non-metal toe caps of the shoes are made from thermoplastic and are resistant to 200 joules. Both models are S1 safety classified according to European Standard EN345, and have antistatic properties as well as being oil and slip resistant. They are available under Yakupoglu’s own brand of ‘YDS’ in Turkey or under national brands throughout Europe and the Middle East.

Yakupoglu is a company manufacturing various military and police footwear, garments and accesories, worker safety shoes and firemen boots. Founded in 1927, its product spectrum consists of safety footwear, uniform and tactical footwear, sport shoes, Goodyear welted and unit soled shoes, Gore-Tex breathable and water resistant boots, summer boots, winter boots and snow boots. Its ‘YDS’ branded safety footwear and equipment are produced according to norms EN ISO 20345 and EN ISO 20345.

The DuPont Engineering Polymers business manufactures and sells Crastin® PBT and Rynite® PET thermoplastic polyester resins, Delrin® acetal resins, Hytrel® thermoplastic polyester elastomers, DuPont™ ETPV engineering thermoplastic vulcanizates, Minlon® mineral reinforced nylon resins, Thermx® PCT polycyclohexylene dimethyl terephthalate, Tynex® filaments, Vespel® parts and shapes, Zenite® LCP liquid crystal polymers, Zytel® nylon resins and Zytel® HTN high-performance polyamides. These products serve global markets in the aerospace, appliance, automotive, consumer, electrical, electronic, healthcare, industrial, sporting goods and many other diversified industries.

DuPont is a science-based products and services company. Founded in 1802, DuPont puts science to work by creating sustainable solutions essential to a better, safer, healthier life for people everywhere. Operating in more than 70 countries, DuPont offers a wide range of innovative products and services for markets including agriculture and food; building and construction; communications; and transportation.

The DuPont Oval, DuPont™, The miracles of science™, Hytrel®, Zytel® and all other product names denoted with ® are registered trademarks or trademarks of E.I. du Pont de Nemours and Company or its affiliates.

This press release is based on information provided by:
Yakupoglu A.Þ.
Havalimaný Yolu 20. Km.
06750 Akyurt-Ankara
Turkey
Tel. +90 312 398 12 13
Fax: +90 312 398 08 78
E-mail: info@yakupoglu.com.tr

Horst Ulrich Reimer | Du Pont
Further information:
http://www.dupont.com

More articles from Materials Sciences:

nachricht New approach improving stability and optical properties of perovskite films
14.02.2019 | City University of Hong Kong

nachricht Calculating correlated materials from first principles
14.02.2019 | Leibniz-Institut für Festkörper- und Werkstoffforschung Dresden

All articles from Materials Sciences >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: Regensburg physicists watch electron transfer in a single molecule

For the first time, an international team of scientists based in Regensburg, Germany, has recorded the orbitals of single molecules in different charge states in a novel type of microscopy. The research findings are published under the title “Mapping orbital changes upon electron transfer with tunneling microscopy on insulators” in the prestigious journal “Nature”.

The building blocks of matter surrounding us are atoms and molecules. The properties of that matter, however, are often not set by these building blocks...

Im Focus: University of Konstanz gains new insights into the recent development of the human immune system

Scientists at the University of Konstanz identify fierce competition between the human immune system and bacterial pathogens

Cell biologists from the University of Konstanz shed light on a recent evolutionary process in the human immune system and publish their findings in the...

Im Focus: Transformation through Light

Laser physicists have taken snapshots of carbon molecules C₆₀ showing how they transform in intense infrared light

When carbon molecules C₆₀ are exposed to an intense infrared light, they change their ball-like structure to a more elongated version. This has now been...

Im Focus: Famous “sandpile model” shown to move like a traveling sand dune

Researchers at IST Austria find new property of important physical model. Results published in PNAS

The so-called Abelian sandpile model has been studied by scientists for more than 30 years to better understand a physical phenomenon called self-organized...

Im Focus: Cryo-force spectroscopy reveals the mechanical properties of DNA components

Physicists from the University of Basel have developed a new method to examine the elasticity and binding properties of DNA molecules on a surface at extremely low temperatures. With a combination of cryo-force spectroscopy and computer simulations, they were able to show that DNA molecules behave like a chain of small coil springs. The researchers reported their findings in Nature Communications.

DNA is not only a popular research topic because it contains the blueprint for life – it can also be used to produce tiny components for technical applications.

All Focus news of the innovation-report >>>

Anzeige

Anzeige

VideoLinks
Industry & Economy
Event News

Global Legal Hackathon at HAW Hamburg

11.02.2019 | Event News

The world of quantum chemistry meets in Heidelberg

30.01.2019 | Event News

Our digital society in 2040

16.01.2019 | Event News

 
Latest News

Gravitational waves will settle cosmic conundrum

15.02.2019 | Physics and Astronomy

Spintronics by 'straintronics'

15.02.2019 | Physics and Astronomy

Platinum nanoparticles for selective treatment of liver cancer cells

15.02.2019 | Life Sciences

VideoLinks
Science & Research
Overview of more VideoLinks >>>