FIVE PARTS OF DUPONT DELRIN IN NEW BONE-CEMENT MIXER
06 December 2006 - DuPont Engineering Polymers

The DuPont acetal’s good elongation at yield makes it possible to mould a leaf-spring as an integral part of the trigger lever, thus eliminating the need for a metal return-spring and related assembly operations. The C-shaped antiscrew pull tab is held in place with a snap-fit, made possible by the acetal’s combination of toughness and stiffness. The ribbed driving shaft relies on the inherent lubricity of Delrin together with its high modulus and strength, which the ribbing requires; the mixing blades perform their task thanks to the material’s flex modulus. The rotary piston is also made of Delrin.

These parts in Delrin would not have been feasible, or would have been more costly, if designed in metals or other materials, according to Dottore Roberta Bidoia of the company bearing her name.

According to Bidoia s.a.s., the Italian company that developed it, the Bocemix offers many attractive features. These include:

faster cement preparation time,
improved mixing quality,
almost complete elimination of air and gas bubbles from the mixed cement
operation under permanent vacuum.
The mixer is a self-contained system, so there is no need for a separate injector. It is suitable for all types of cement (with some limitations for zirconium dioxide cement). Mixing can be done manually or with an electric power source. The transparent barrel allows visual inspection of the consistency of the cement.

The combination of characteristics of unreinforced Delrin acetal that made this design possible include a blend of toughness and stiffness, high tensile strength, dimensional stability and a low-friction surface.

The company, established in 1946, is a supplier of medical devices and instruments to doctors, hospitals and surgeons. The company's products portfolio includes osteosynthesis and laparoscopy equipment.

Apart from Delrin acetal resin, DuPont Engineering Polymers supplies a wide range of engineering thermoplastics for a broad range of uses, including special control and premium control grades for the healthcare industry.

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, Minlonmineral-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, industrial, sporting goods and many other diversified industries.

http://plastics.dupont.com

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