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Injection molding of glass fiber reinforced polypropylene composite foams with laminate skins

: Kasemphaibulsuk, P.; Holzner, M.; Kuboki, T.; Hrymak, A.

Society of Plastics Engineers -SPE-:
75th Annual Technical Conference and Exhibition of the Society of Plastics Engineers, SPE ANTEC 2017 : Anaheim, California, USA May 8-10, 2017
Bethel: SPE, 2017
ISBN: 978-0-692-88309-9
Society of Plastics Engineers (SPE ANTEC Annual Technical Conference) <75, 2017, Anaheim/Calif.>
Fraunhofer ICT ()

Sandwich panels which consist of discontinuous glass fiber reinforced polypropylene composite foam core and continuous glass-fiber reinforced polypropylene laminate skins were manufactured using industry-scale equipment in a streamlined manner. The process included the two stages: (1) continuous glass-fiber reinforced polypropylene laminates as the face skins were produced using an automated tape layup machine and a hydraulic press and (2) discontinuous glass-fiber reinforced polypropylene composite as the core was foam injection-molded onto the face laminates (i.e., overmolding) with a physical blowing agent, nitrogen. The results suggested that the addition of the laminate skins and foaming by the core-back (or mold opening) technique can greatly reduce weight of material needed to have the same bending stiffness and maximum bending force.