KNOXVILLE, Tenn.—A new process that Magnum Venus Products (MVP) developed for closed molding is reported to increase part production by decreasing injection times. The new technique, Fast Flow LRTM, is a blend of MVP’s Flex Molding Process and Light Resin Transfer Molding (LRTM). It uses collapsible resin channels for a faster resin flow, MVP said in a release.
Magnum Venus Products is a global manufacturer of fluid movement and production solutions for industrial applications in composites and adhesives markets. The company said the process was brought about by the need to achieve faster cure times for large parts using high-viscosity resins, such as fire retardant materials. Further trials and testing are currently underway with a large automotive manufacturer.
When using a traditional LRTM mold, resin flow speed is dependent on the distance between the resin channel and center of the part during injection. The Fast Flow LRTM technique uses the same silicone collapsible resin channels developed for the Flex Molding Process. It also leverages a unique channel arrangement that allows channels to be installed closer together to decrease the resin flow distance and speed up injection times, MVP said.
This process is reported to be capable of injecting a 50-square-foot part in under four minutes using only one injection port, while also delivering a good backside surface aspect equivalent to traditional LRTM. By injecting the resin from the center to the border, the part demolds with a finished look and no visible resin channels, wasted materials, or excess resin, the company said.
In the Fast Flow LRTM process, the female mold is constructed like an LRTM mold, but there are key differences in the counter mold construction. It’s built with a silicone skin including a collapsible resin channel, then reinforced with composites. For this step of the process, MVP said it developed a unique method to bond composites to silicone. The rigid counter mold is said to provide a high quality backside surface, while the silicone membrane shows the reinforcement of the produced part.
Magnum Venus Products (www.mvpind.com) collaborates with customers to offer tailored production systems to meter, mix, dispense, and apply materials. The company has provided equipment for numerous industries—including marine, infrastructure, pool and bath, oil and gas, transportation, aerospace, and wind energy—for more than 80 years.