The miracles of science™

Select Industry


Engineering Plastics

News

Stevenage, March 31, 2008

Smooth operator: Adjustment device for dishwashers relies on engineering polymers from DuPont

mechanism used to adjust the height of the upper baskets in dishwashers

A mechanism, used to adjust the height of the upper baskets in dishwashers and developed by Turkish appliance manufacturer Vestel, relies on the smooth, functional performance of DuPont™ Delrin® acetal resin and DuPont™ Minlon® mineral reinforced nylon. Both materials were selected for the application due to their combination of strength and dimensional stability, as well as additional benefits such as their appealing surface finish and overall colourability. The patented device is used on dishwashers in both the Turkish domestic market and across Europe.

The adjustment mechanism allows consumers to simply adjust the height of the upper rack of dishwashers, even when full, for greater convenience. It consists of four principal parts, all made from DuPont high performance polymers. A base plate, which is securely attached to the dishwasher’s upper basket using snap-fits, is moulded in a particularly low-wear, low-friction grade of Delrin®. It interlocks with a rail plate, moulded in a strong and stiff grade of Minlon®, which has integral wheels – moulded in Delrin® – that fit within the dishwasher rails and enable the basket to glide in and out for easy loading. Between the two plates, which slide above each other in a vertical motion, is a fixing plate made of Delrin®. It contains a star-shaped, rotating cog – also moulded in Delrin® – which locks the basket in place at the desired height.

The DuPont materials are integral to the smooth running of the adjustment mechanism due to their functional properties, which are maintained despite multiple wash cycles of up to three hours. Testing of the adjustable basket mechanism included push-pull tests with full loads. “We had previously trialled some other polymers, but had encountered problems in terms of warpage, which hindered the mechanism’s operation,” comments Orhan Hülagü, research and development engineer at Vestel’s dishwasher factory. “The DuPont materials provided the right combination of strength and dimensional stability, as well as additional benefits such as their appealing surface finish and overall colourability. With a large degree of interaction between the two materials, their low noise and low friction performance when in contact with each other adds to the overall convenience of the system.”

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 dimethylterephthalates, Tynex® nylon filaments, Vespel® parts and shapes, Zenite® liquid crystal polymers and 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.

# # #

EP-EU-2008-05
March 2008

Click here and save to download a 300dpi JPEG image of the photo.

Photo: DuPont
User-convenience: thanks to the performance of DuPont engineering polymers, the patented mechanism from Vestel allows users to smoothly adjust the height of the upper basket of dishwashers, regardless of where they hold it.

This press release is based on information provided by:

Vestel White Appliances (Dishwasher Plant)
Manisa, Turkey
Contact: Orhan Hülagü, R&D Engineer
Tel. : +90 236 226 30 00
Email: orhan.hulagu@vestel.com.tr
Web: www.vestel.com.tr

Media Contacts