DETROIT - DuPont Co. of Wilmington, Del., has developed a new, welding-enhanced nylon 6/6 to compete with nylon 6 resins in applications for automotive intake manifolds. In an apparent acknowledgement that two-piece, welded nylon air intake manifolds might overshadow one-piece manifolds made with lost-core molding techniques, DuPont Automotive introduced its welding-enhanced resin saying it has burst resistance equal to or better than nylon 6.
While automakers have designated both nylon 6/6 and nylon 6 for air intake manifolds, the latter primarily is used in two-piece manifold systems because it welds more easily and its welds have been stronger. Burst resistance is necessary in auto manifolds to prevent ruptures in the event of an engine backfire.
DuPont previously was an advocate of one-piece, lost-core molding technology, and several of its competitors said at the SAE Exposition that they view its introduction of a nylon 6/6 resin that can be welded as a major shift in its position.
DuPont also announced it has invested nearly $500,000 in vibration welding equipment to expand its technical services to support the development of welded, composite air intake manifolds throughout the world.
DuPont has installed vibration welding equipment at its technical facilities in Troy, Mich., and Geneva and said it plans to install a third vibration welding machine at a technical facility in the Asia-Pacific region by the end of this year.