CROWN CORK & SEAL CO. INC. -Michael McKenna was named president and chief operating officer of the Philadelphia-based producer of plastic and metal packaging. McKenna has been with the firm for 39 years. William Avery, who was president of the company, will retain his titles of chairman and chief executive officer.
DUPONT CO. - Craig Naylor was named vice president and general manager of DuPont Engi-neering Polymers, headquartered in Geneva, Switzerland. He succeeds Eduard van Wely, who was named vice president and general manager of DuPont's nylon fibers business. Also, three researchers at the Wilmington, Del., chemical company have won the 1995 Pederson Award for Technical Excellence: David England, Carl Krespan and E. Barry Jones.
ELKAY CORP. - David Fleck was named chief executive officer and president of the Shrewsbury, Mass., manufacturer of disposable medical products. He was vice president and general manager of Trend Plastics and Tool Tech Inc. in San Jose, Calif.
HOMELITE INC. - David Walker was named vice president of operations for the Charlotte, N.C., manufacturer of lawn and garden appliances and portable construction equipment. He was director of manufacturing operations. Homelite is a subsidiary of Deere & Co.
POLYGON CO. - Richard New-berry was named president and chief executive officer of the Walkerton, Ind., manufacturer of composite medical tubing, armature shaft insulation and bearings.
RESIN CORP. - Carol Lareau was named sales manager for the Chicopee, Mass., contract manufacturer of vinyl packaging and point-of-purchase displays.
REXENE CORP. - Jonathan Wheeler was named president of the firm's Condolidated Thermo-plastics Co. (CT Film) unit. He will remain executive vice president, administration, for the parent, a Dallas-based film and resin maker.
SEAWARD INTERNATIONAL INC.-Donald Murray was named chief financial officer of the Clearbrook, Va., plastic lumber manufacturer. He had been with Rubbermaid Commercial Products in Winchester, Va.