Other Product Forms Considerations. RTM and VARTM Materials (Constituents – resin, fiber, tackifiers, cores, stitches/pins, special forms; also consumable materials) Processes (Fiber processing, ply cutting, lay-up, preforming, demolding, post-mold operations) Sandwich
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Hot melt, heat-activated ingredients, degassed liquid resin, viscosity, visual/color, cure parameters, other parameters
Liquid/aqueous and powder
Physical parameters (powder size, viscosity), cure parameters, ingredients/chemistry, other
Resin compatibilityRTM and VARTM Material Considerations (cont’d)
Braiding, specialty weaving, stitching, pinning, hybrids, special forms (T’s, H’s, etc.), automation, consumables
Lay-up and Preforming (MOST CRITICAL!)*
Special tooling/fixturing for complex shapes
Special details (braids, cores, T’s, noodles, etc.)
Ply cutting and handling – multi-ply packs/kits
Preform locating techniques (tooling pins, features)
Tackifiers, pins, stitches, etc.
Special tooling/fixtures and processesRTM and VARTM Process Considerations
* If the preform is wrong, STOP!
Gap measurement, vacuum check, bag check
Resin injection/infusion sequence/cycle
Critical heating areas, heat-activated ingredients/cure agents (preform=filter)
Bleed technique/sequence, bag check
Ramp-up, back pressure
Plumbing diagram (consumable plumbing, preheater)RTM and VARTM Process Considerations (cont’d)