Dampers are a critical component in the ink delivery system of direct-to-film (DTF) printers. They regulate the flow and pressure of ink to the printhead, ensuring smooth, consistent, and high-quality printing while protecting the printhead from damage.
Here's a breakdown of their functions
- Pressure stabilization: As the printhead carriage moves back and forth at high speed, it creates pressure fluctuations in the ink lines due to inertia. A damper contains a flexible diaphragm that absorbs these minor pressure changes, preventing issues like ink dripping or starvation that can cause defects like banding.
- Ink filtration: Dampers often have a built-in micron-level filter that screens out impurities and small particles in the ink before they can reach the delicate printhead nozzles. This prevents clogs and greatly extends the life of the printhead, a costly component to replace.
- Air bubble removal: Air bubbles can enter the ink lines through supply tanks or loose connections. Dampers act as a reservoir where these bubbles can be trapped and vented out, preventing air from reaching the printhead. Air in the printhead can cause misfires and ink flow disruptions, leading to inconsistent print quality.
- Consistent ink supply: Dampers act as a small, secondary ink reservoir directly upstream of the printhead, ensuring a steady, reliable supply of ink even during high-speed, intensive printing jobs. This prevents "ink starvation," a common cause of print dropout.
- Protection for the printhead: By regulating pressure, removing bubbles, and filtering ink, dampers protect the printhead's delicate internal components from physical damage and stress.
Symptoms of a failing damper:
A failing or clogged damper will negatively impact print quality and can harm other printer components. Signs to look for include:
- Missing nozzles: A printer nozzle check reveals inconsistent or missing lines.
- Banding: Horizontal lines or streaks appear across the print, often caused by inconsistent ink flow.
- Ink dripping: Ink leaks from the printhead, which can indicate the damper's valve is not properly regulating pressure.
- Inconsistent quality: The overall print is uneven, faded, or shows color shifts due to inconsistent ink delivery.
Damper maintenance
Because dampers are a consumable part, they need to be replaced periodically - consider them like insurance policy for your printheads. How often depends on how much you use your printer, but we would say replacing the white dampers especially, about every 25-30 rolls of film you print