USED 2025 DAWSON MACHINERY CUSTOM INKJET , 4 INCH , 9 INCH MULTIPLE SIZES

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1. How They Work

Nozzles: Each head contains hundreds or thousands of microscopic nozzles (often 10–50 μm in diameter).

Droplet Formation: Ink is pushed through these nozzles in precise volumes (picoliters) and at exact timings to produce an image.

Firing Mechanism: The ink can be ejected by:

Thermal (Bubble Jet): Heats the ink to form a vapor bubble that pushes it out.

Piezoelectric: Uses a piezo crystal that flexes when voltage is applied, pushing ink out without heat.

Continuous Inkjet (CIJ): A continuous stream of ink drops is charged and deflected onto the substrate or into a waste stream.

2. Types of Inkjet Print Heads

Thermal Inkjet (TIJ)
Common in desktop printers (HP, Canon).
Lower cost, disposable heads.
Not suited for all inks (heat-sensitive inks may be problematic).
Piezoelectric Inkjet (PIJ)
Found in Epson, Ricoh, Konica Minolta industrial heads.
Can handle more ink types (UV-curable, solvent, aqueous, pigment).
Higher durability, precise droplet control.
Continuous Inkjet (CIJ)
Used in coding/marking applications (date codes, batch numbers).
Extremely fast, works on non-porous surfaces.

3. Key Performance Specs

Resolution (DPI): How many droplets per inch; higher DPI means sharper detail.

Drop Size: Measured in picoliters; smaller drops allow smoother gradients.

Firing Frequency: Determines speed (often in kHz).

Ink Compatibility: Solvent, water-based, UV, dye, or pigment-based inks.

Head Life: From a few liters of ink (disposable heads) to hundreds of liters (industrial heads).