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The whole bag may be put in a temperature-controlled oven, oil bath or water bath and gently heated to accelerate curing. Vacuum bagging is used broadly in the composites industry as well. [4] Carbon fibre fabric and fibreglass, along with epoxies and resins are popular materials laminated together with a vacuum bag operation.
Vacuum Assisted Resin Transfer Molding (VARTM) or Vacuum Injected Molding (VIM) is a closed mold, out of autoclave (OOA) [1] composite manufacturing process. VARTM is a variation of Resin Transfer Molding (RTM) with its distinguishing characteristic being the replacement of the top portion of a mold tool with a vacuum bag and the use of a vacuum to assist in resin flow. [2]
The vacuum bag technique involves the placing and sealing of a flexible bag over a composite lay-up and evacuating all the air from under the bag as schematically shown in Figure 6. Figure 6: Left: Details of vacuum bag lay-up. Right: Vacuum bag sealing and vacuum application results in atmospheric pressure on the repair region (prepreg)
The equipment is composed of a tool, a press, an injector, and a vacuum pump. [4] The key factors in the SQRTM process include precision machined closed mold tooling, high pressure presses, a high vacuum applied to the tool interior, and precise control of heating platens, injected resin volume, heat, and pressure. [citation needed]
Hence, composite structures built of pre-pregs will mostly require an oven or autoclave to cure. The main idea behind a pre-preg material is the use of anisotropic mechanical properties along the fibers, while the polymer matrix provides filling properties, keeping the fibers in a single system.
Vacuum bag molding, a composite material forming process This page was last edited on 18 March 2014, at 11:22 (UTC). Text is available under the Creative Commons ...