Plastic and nonmetallic article shaping or treating: processes – Mechanical shaping or molding to form or reform shaped article – To produce composite – plural part or multilayered article
Patent
1993-12-23
1995-08-22
Heitbrink, Jill J.
Plastic and nonmetallic article shaping or treating: processes
Mechanical shaping or molding to form or reform shaped article
To produce composite, plural part or multilayered article
2643281, 2643282, 26432812, 4251291, 425546, 425812, B29C 4514, B29C 4534
Patent
active
054437784
ABSTRACT:
A method for reducing the occurrence of voids and areas of porosity in injection molded parts. Vents are placed within the injection mold near areas of the molded part that are prone to the occurrence of voids and areas of porosity. A porous flow regulator is placed adjacent the vents to regulate the flow of the resin near the vent. The flow regulator allows air trapped within the mold to escape through the vents during molding. Allowing air trapped within the mold to escape reduces the occurrence of voids and areas of porosity in the molded part. A porous plug extends through the flow regulator and into the vent. The porous plug prevents excess quantities of resin from flowing out of the vent, thus reducing waste and also helping to maintain the flow regulator in place.
REFERENCES:
patent: 3822857 (1974-07-01), Tanie
patent: 4740145 (1988-04-01), Shurman
patent: 4876050 (1989-10-01), Horton
Eckler et al., "Development of Flow Models for SRIM Process Design," ASM, IEDS Adv. Compos. Conf. (1987).
Slocum et al., "Material and Process Effects on the Cost of Structural RIM," SAE Technical Paper Series International Congress and Exposition SAE No. 890199 pp. 33-41 (Feb. 27-Mar. 3, 1989).
Chan et al., "Modeling Nonisothermal Impregnation of Fibrous Media With Reactive Polymer Resin," Polymer Engineering and Science vol. 325 pp. 310-318 (Mid-Mar. 1992).
Heitbrink Jill J.
Tempress Incorporated
LandOfFree
Vent apparatus and method for thermoset injection moulding syste does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Vent apparatus and method for thermoset injection moulding syste, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Vent apparatus and method for thermoset injection moulding syste will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2139835