Injection Compression Molding of Long Glass Fiber Reinforced Polypropylene LNP Engineering Plastics Incorporated

Format:

Conference/Event

Author/Creator:

Gottgetreu, Scott R., author.

Conference Name:

International Congress & Exposition (1998-02-23 : Detroit, Michigan, United States)

Language:

English

Physical Description:

1 online resource

Place of Publication:

Warrendale, PA SAE International 1998

Summary:

A study has proven that by utilizing the injection compression molding (ICM) technique, mechanical properties of long-glass-fiber-reinforced polypropylene (LGFR-PP) are significantly enhanced compared to properties obtained employing standard injection molding (SIM). The ICM technique preserves the initial 11-mm long fiber glass lengths, allows lower injection pressures, reduces molded-in stresses, provides less warpage, and improves weldline strength. This study involved injection compression molding 1.5-mm and 3-mm thick plaques from 30%, 40% and 50% long-glass-fiber-reinforced PP, using SIM as the control. Tensile strength, flexural strength, and flexural modulus values, in both the flow and transverse direction, were generated on specimens cut out and machined from the respective plaques. Falling dart instrumented impact energies were also acquired. Greater benefits were realized at the thinner 1.5-mm substrate thickness. Falling weight impact energies were 25 to 45% higher. As part of the study, in-mold laminated ICM coverstock/substrate parts were produced for commercial applications development. By combining ICM with in-mold lamination, LGFR-PP materials allow automotive design engineers the capability to reduce part weight and cost by downgauging substrate thickness while maintaining high stiffness and impact strength

Notes:

Vendor supplied data

Publisher Number:

980724

Access Restriction:

Restricted for use by site license