MJF
Multijet Fusion
Overview
MJF parts are built within a build chamber. The part productivity depends upon the size of the object as it relates to the volume of the build chamber, the production time and finishing required. Because the core material is in powder form, it is possible to vertically stack parts within the build chamber.
Process Summary
- 1
Step 1
Printing
A thin layer of powdered material is evenly spread across the build platform by a re-coater blade. The inkjet array selectively applies a fusing agent and a detailing agent in tandem. The fusing agent binds the powder particles, whilst the detailing agent refines the edges and improves precision. The build platform then lowers by the preset layer height to allow every subsequent layer to be spread and jetted with each layer bonding to the previous one beneath it, until all slices of the object are complete.
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Step 2
Support Removal
Focuses on powder removal rather than physical support detachment and removal. The build chamber is removed from the machine and transferred to a de-powdering station. Here the base of the build chamber is pushed up to reveal the compacted block of powder commonly known as the build "cake". This is then broken down by hand to release the solid parts within, which are then brushed or blown free of most of the surrounding loose powder.
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Step 3
Surface Finishing
Sanding / Polishing Light sanding is possible for smoothing or prepping for coatings. Chemical Smoothing / Coating Vapor smoothing enhances surface quality and seals porosity. Dyeing Often done using proprietary technology for consistent colour replication. Painting / Priming Common for aesthetic parts; painting requires cleaning and priming due to porous surfaces. Gloss / Matte Control Typically matte by default; gloss can be added with coatings or finishes.
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Step 4
Curing / Heat Treatment
UV / Thermal Curing Non-applicable. Annealing / Stress Relief Non-applicable.
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Step 5
Assembly and Functional Finishing
Gluing or Bonding Superglue or epoxy works well for joining parts. Drilling / Tapping / CNC Common and effective for adding precision features. Inserts / Fasteners Heat-set threaded inserts are frequently used in functional parts.
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Step 6
Special Treatments
Infiltration / Sealing Optional epoxy or resin sealing for waterproofing or improving dye absorption. Functional Coatings Can be coated for colour, UV resistance, or chemical protection.
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Step 7
Productivity
MJF parts are built within a build chamber. The part productivity depends upon the size of the object as it relates to the volume of the build chamber, the production time and finishing required. Because the core material is in powder form, it is possible to vertically stack parts within the build chamber. This information relates to the potential productivity of a single machine. All AM types can be arranged together to form print farms or smart factories that will increase productivity. These collections of multiple units can also provide opportunities for varying degrees of automation.
Technical Information
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