Fiberglass Chopper Guns & Spray-up Roving Cutters
Technical specifications for composite chopper guns, internal and external mix pneumatic spray dispensers, roving cutter heads, and calibration procedures.
Buying notes and qualification boundaries
Chopper guns and spray-up equipment automate open-mold composite fabrication by simultaneously cutting continuous fiberglass roving, atomizing catalyzed thermoset resin, and depositing a uniform wet fiber-matrix slurry onto the mold surface. This process provides high deposition rates for fiberglass boats, truck fairings, bath modules, and storage tank end caps.
Equipment selection balances pneumatic air motor performance, tungsten carbide cutter blades, and delivery mixing mechanics. Internal mix guns combine resin and MEKP catalyst inside a static mixing chamber before tip atomization, minimizing hazardous VOC emissions and overspray fog; external mix guns impinge separate catalyst and resin streams outside the nozzle, eliminating solvent-flush cycling during brief production pauses.
Operating teams must calibrate chopper guns daily using test capture bags and digital scales to verify target glass-to-resin ratios (customarily 25% to 35% glass by weight). Verify fluid pressure regulators, roving tension guide ceramic eyelets, catalyst slave pump synchronization, and ergonomic counterbalanced boom suspensions.
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