The following items were reported by Plastics News correspondent Roger Renstrom from the SAMPE symposium and exhibition, held May 8-11 in Anaheim, Calif.
Nisa Core shows off new PE film backing
Honeycomb supplier Nida-Core Corp. markets an extruded polypropylene core that is thermofused to nonwoven polyester scrim to facilitate bonding.
Nida-Core H8PP Honeycomb, introduced at SAMPE, has a new polyethylene film backing that limits resin consumption but is porous enough to allow vacuum bagging. Nida-Core sees H8PP as an improvement on open-cell honeycomb, said President Damien J. Jacquinet.
The 8-year-old firm extrudes the material in a plant near Paris that employs 30. It has offices in Hoboken, N.J.
Thiokol Corp. group displays resin system
Thiokol Corp.'s Material Products Group has developed a prepreg resin system that can be stored at ambient temperatures for at least 11/2 years.
Existing systems begin to degrade after 30-60 days without refrigeration.
The solvent-free prepreg controls resin content within 1 percent, Thiokol's Scott Fletcher said. Resin content and flow can be tailored to customer requirements.
The Thiokol unit, located near Brigham City, Utah, has used the system on its Castor 120 solid rocket motor cases, with both fiber tow for the filament winding of the case and fabric for the skirt.
According to Fletcher, the outlife expectancy continues to increase.
Typically, the prepreg material costs about 15 percent less than standard modulus graphite tow, he said.
Bakelite AG expands operations in U.S.
German phenolic resins manufacturer Bakelite AG has expanded to the United States with formulated systems for use with composites, Alex Bottcher, manager of development and applications for fiber-reinforced plastics, said in an interview at the show.
Bill McKillip, president of distributor Advanced Resin Systems in Des Plaines, Ill., said marketing will focus on casting, brick refractory and laminate applications.
Dieter Sommerfeld, a Bakelite marketing and sales manager, recognized the potential for confusion with the U.S. tradename Bakelite, owned by Georgia Pacific for phenolic parts for aircraft interiors.
Bakelite AG, based in Iserlohn-Letmathe, Germany, manufactures industrial liquid and solid resins at three plants in Germany, two in Spain and two in Italy and contracts with Delta Resins & Refractories in Detroit to make liquid phenolic resins for the North American market.
SAMPE names six student winners
SAMPE awarded $2,600 in prizes to six winners in a student symposium.
Angela Trego of Richland, Wash., and Christopher Gabrys of Medford, N.J., tied for first place in the category for Ph.D. candidates. Trego, a student at Brigham Young University, presented a paper on improving structural damping of mechanical elements.
Gabrys of Penn State University presented a paper on fabricating thick filament-wound carbon epoxy rings. Each received $700, the largest awards.
Justin Berman of Virginia Beach, Va., received second place among Ph.D. candidates. Berman of the University of Illinois presented a paper about a three-phase cylinder model for thermal and transformational stresses.
Timothy Walsh of Cranberry Township, Pa., won first place among master's degree candidates. Walsh, also of Penn State University, presented a paper on the impact resistance of Spectra composites.
David Dooling of St. Louis and Dhirendra Bora of Kanata, Ontario, tied for first place among undergraduate seniors. Dooling, of the University of Dayton, analyzed rotational distributions from an overlapped NS spectrum via linear regression. Bora, of the University of Ottawa, presented an analytical model to predict flexural rigidity of a glass-fiber-reinforced, recycled plastic beam.
Tony E. Saliba, chairman of the University of Dayton's chemical and materials engineering department, said 90 students competed.