LFI process mixing head

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LFI process mixing head - Mixing PU components

Mixing PU components

  • High-pressure counterflow injection: Components are shot into a mixing chamber at high speeds where the speed energy is converted into mixing energy
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LFI process mixing head - Wetting glass fibers

Wetting glass fibers

  • The flow-oriented geometry of the cleaning piston generates a hollow, hose-shaped material flow and ensures optimum wetting of the shortened glass fibers
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LFI process mixing head - Chopping glass fiber rovings

Chopping glass fiber rovings

  • Cutting unit with cutter roller and pressure roller
  • Service-friendly: optimum accessibility with easy cutter roller replacement
  • Adjustable fiber quantity and length

Fibers and PU in composite material

The LFI-PU (long-fiber injection polyurethane) process is used in the production of high-strength, lightweight parts. The LFI process unit performs three main tasks that are crucial for ensuring the quality of the end product.

  • Transporting and chopping the roving
  • Mixing the reaction components
  • Wetting the fibers with the reaction mix

Core features

  • Transfer mixing head: Mixing the raw material components in a high-pressure, counterflow injection process
  • The flow-optimized geometry of the cleaning piston generates a hollow, hose-shaped material flow
  • The glass fibers chopped by the cutter head are forced by air pressure through the cleaning piston into the center of this hose-shaped flow where they are wetted with the reaction mix and, simultaneously, poured into the open cavity

Benefits for the customer

Versatile application, such as for instrument panel supports, interior parts and in combination with sandwich components in a honeycomb
Direct wetting of the fibers for maximum adhesion of the polyurethane matrix to the reinforcement material
Fiber quantity and length can be configured based on requirements, allowing for variation in them even in one article

Applications

Radiator grill for utility vehicle
Engine hood for combine harvester

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