Abstract: A method of waste-less molding of rubber is disclosed. The method includes, in a first step, providing unvulcanized rubber that forms rubber of a predetermined tensile strength when vulcanized. In a second step, a mold having an injection port and a mold cavity is provided. The injection port and mold cavity are in fluid communication for forming a rubber part within the mold cavity and a sprue connected thereto extending into the injection port. In a third step, the injection port is configured to have a first point of a first cross-sectional area and a second point of a second cross-sectional area wherein the ratio of the first cross-sectional area to the second cross sectional area with regard to the tensile strength of the rubber causes the sprue to fail at the first point prior to failing at the second point when sufficient tensile stress is applied to the part.

Abstract: The present invention relates to a laser-cutting method and system for processing shaped articles such as O-rings, seals, and gaskets. The article can be a polymeric material such as a rubber or elastomeric material. A web material having a shaped pattern of an article on its surface is provided. A laser beam is directed along the shaped pattern to cut the article from the web and trim away any flashing. The resulting cut article has a surface substantially free of any flashing, burrs, or other excess materials. Camera optical and positioning systems can be used with the laser system.