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178. Introduce the promising rapid prototyping technology

Just as sophisticated urethane dispensing machines and CNC machine centers have found their way into polyurethane facilities, additive fabrication and rapid prototyping are gaining popularity in polyurethane processing, especially with these techniques' ability to reduce on development time and costs.

The key to Polyjet technology is a special inkjet with a built-in UV laser spraying to build each layer. Similarly, FDM feeds a plastic, wire-like filament unwrapped from a supply coil to a heated extrusion nozzle with an on-off valve spraying liquid polymer layer by layer. Polyjet is new and more costly than other processes featured here, but it has a niche for building small parts that require fine details. FDM offers more flexibility in polymers, with tradeoffs between strength and service temperature.

EBM uses a high-energy, precisely focused electron beam to melt fine metal powders layer by layer. The resulting product is solid and doesn't require any additional thermal treatment. This makes EBM not only faster, but allows it to build high-definition masters and products.

Reminder: Polyurethanes are not metals, so plan accordingly. In fact, urethanes have a thermal expansion coefficient 10 times that of most industrial metals! Be sure to take such factors into account and design smart to avoid big problems and delays in production tooling.