GMW GMW18647 PDF

Note: Nothing in this standard supercedes applicable laws and regulations.

Note: In the event of conflict between the English and domestic language, the English language shall take precedence.

Purpose/Material Description.

This standard provides the specification and qualification for polymers used in the Multi Jet Fusion process (MJF). Multi Jet Fusion is a powder bed additive manufacturing process. After a layer of powder is spread into the print chamber, liquid agent is applied via an ink-jet droplet delivery process. Typically, banks of jetting nozzles pass over the bed of powder to enable a high rate of liquid deposition. These tiny liquid droplets are applied locally to define part geometry for a single layer. The liquid is used to increase the heat absorption of the material. Next, an infrared heat source runs over the bed of powder to melt the powder locally where the liquid was applied. The liquid is evaporated in the melting process. Once the pattern is fused, the bed lowers, and another layer of powder is deposited. This next layer is melted on top of the previous layer in the same method. The printed objects are formed layer by layer and supported by the surrounding unfused powder. Parts tend to have good surface finish due the small layer thickness (approximately 80 μm). Key process variables include ink formulation (composition, solvent system, solid loading fraction), deposition temperature, substrate temperature, substrate stand-off distance, print pattern and deposition pattern (scan speed, droplet generation rate, hatch spacing, etc.)

Symbols.

The material abbreviation according to ISO 11469 is shown in Table B1.

Applicability.

Any component manufactured by the Multi Jet Fusion additive process.

Remarks.

None.