Plastic transfer molding techniques for the production of fiber reinforced plastic structures
Patent 4902215 Issued on February 20, 1990. Estimated Expiration Date: 
March 30, 2009. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
March 30, 2009. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 2913036 2977269 3055058 3553054 3575756 3775214 Method for molding fiber reinforced composite tube Method of molding resin-impregnated fabric layer using release sheet and absorbent sheet inside evacuated bag Process for manufacturing resin-impregnated, reinforced articles without the presence of resin fumes Resin impregnation process InventorApplicationNo. 333747 filed on 03/30/1989US Classes:425/406, PRESS FORMING APPARATUS HAVING OPPOSED PRESS MEMBERS156/382, Evacuated or fluid pressure chamber156/500, With casting, plastic molding, or extruding means425/389, By fluid pressure actuated flexible diaphragm425/405.1MEANS TO CREATE A VACUUM OR APPLY FLUID PRESSURE WITHIN A PRESS FORMING MOLDExaminersPrimary: Hoag, Willard E.Attorney, Agent or FirmForeign Patent References
International ClassesB29C 043/02B29C 043/20 B29C 043/18 AbstractA process, and apparatus for the production of fiber reinforced plastic structures, particularly high strength fiber reinforced plastic structures via an improved vacuum assisted technique. In apparatus which includes a fluid impervious outer sheet, or bag, provided with a resin inlet, marginally sealed upon a mold to provide a chamber in which can be place a fiber lay up and which in turn is provided with a vacuum outlet there is provided a resin distribution medium for location on one side of the fiber lay up of character which permits on application of a vacuum the ready, continuous flow of resin via the resin inlet into the chamber to the marginal edges of said resin distribution medium. Closure of the outer sheet, or bag, with the fiber lay up is prevented by the presence of the resin distribution medium while the flow of resin is continued throughout the resin distribution medium, the resin applied to one side of the fiber lay up, and the resin cured. The fiber reinforced plastic structure is removed from the mold after the resin has cured by peeling away the outer sheet, or bag, and resin distribution medium. The strength of the fiber reinforced plastic structures, and fiber reinforcement-to-plastic ratios are of quality and strength approximating structures made by the more complex prepreg-autoclave processes.Field of SearchVACUUM TREATMENT OF WORKTo degas or prevent gas entrapment Impregnation of batt, sheet, or filament Heat settable impregnant Joining a plurality of superposed fibrous or textile layers Utilizing a flexible, deformable, or destructable molding surface or material Woven or felted sheet-form work Including application of vacuum to hold, support, or sustain a preform against which material is molded Producing hollow work or a tubular article Producing multilayer work or article Providing escapeways for gases trapped or generated between layers To remove gas from between assembled laminae Evacuated or fluid pressure chamber With casting, plastic molding, or extruding means MEANS TO CREATE A VACUUM OR APPLY FLUID PRESSURE WITHIN A PRESS FORMING MOLD PRESS FORMING APPARATUS HAVING OPPOSED PRESS MEMBERS Vacuum or suction means By fluid pressure actuated flexible diaphragm | |
