PLASTIC MOLDING TO CONTROL CREEP
Original Publication Date: 1983-Apr-30
Included in the Prior Art Database: 2004-Apr-04
Xerox Disclosure Journal
Complex molded plastic parts can be used for functional frames and bases on automatic reproducing equipment. At high compression loadings, the creep (dimensional change over time) of the plastic material may be stabilized and the molded plastic part strengthened by providing at least one cavity within the molded article having a reinforcing element inserted in it. Preferably, the cavity is integrally molded into the plastic part and is oriented such that the reinforcing element is in the direction of loading stress. Figures la, Ib, lc illustrate the simplest embodiment wherein a thin column or rod is inserted in a hole formed in the molded part. While the unreinforced plastic part is subject to creep and the unsupported thin column is subject to buckle, when used together the reinforced molded plastic part is capable of supporting substantial loads without creep or buckle. Other reinforcing shapes including angular shaped rods, channels and wire mesh can be precisely located in cavities to provide a reinforced plastic part. This structure enables the use of plastic frames which can take design loads in compression and bending.