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Vinyl ester resin was also used on this part. The catalyst level added to the resin gave a gel time of about one hour. Infusion time was about 25 minutes. The resin was allowed to cure overnightatroomtemperature. Thepartwasmoldedoverainteriormoldandfloatedoffthe mold using a new process developed by Sunrez. This new process allowed for full vacuum against the part during infusion and floated off the mold by a few thousandths during cure. Thisallowedforazerodraftmoldandadditionalcompressiononthepart. Normallyavinyl estershrinksenoughinalaminateofthistypetolocktheparttothemold. Infusionwasalso accomplished with a vinyl ester resin. The catalyst level added to the resin gave a gel time of about one hour. Infusion time was about 25 minutes. The resin was allowed to cure overnight at room temperature. On all of the parts, except the leading edge, the infusion was done in a progressive zone pattern. Duetothevalueofthematerialsofthefullscalewingsection($20,000+per laminate) we decided that we would do zone filling to assure that the zone was properly wet out prior to opening the next zone. Filling times within the zones were very fast, which allowed us to infuse the total part in less than the 1 hour open time of the resin. Infusion on the scale wing section was accomplished by infusing the inside laminate first to assurewetout,theninfusingtheouterlaminate. Sincethiswasablindinfusionwedecided that we would witness the resin flowing to the outer edges of the inside laminate prior to infusing the outer skin. 2.6. Determine What Improvements are Needed In Phase II With the LS VARTM Process with Respect to Two Part Resin Systems, Complimentary Processes, Reinforcements, and Part Configuration and Submit Phase I Final Report. Based on the Phase I Program results, Sunrez will continue to develop new grid/infusion patterns and investigate more bagging materials. We have discovered some areas which need improvement in very specialized one off parts. When standard flat bagging films will be used which will have folds on shaped or compound curved parts, we can plan the grid system forfoldsinthetoplaminatebag. Onaproductionpartusingadedicatedtopvacuumbag these folds would not occur and the only allowances necessary are those involving reins flow speeds and zone control if required. Our results have shown us that a wide channel is more effective that a thin deep channel at the infusion point. And that a narrower taller channel is more effective at the vacuum point (the end of the resin run. ■1 0 -PDF Image | Affordable NDM Vacuum Assisted Resin Transfer Molding
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