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What is Sublimation Transfer Ink backflow?
Ink backflow refers to the ink flowing backward from the printhead to the ink cartridge or ink supply tube, causing pressure imbalance in the ink supply system, resulting in problems such as ink breaks, color mixing, incomplete printing, and printhead errors.
The micro-pressure ink supply system essentially relies on sealing + micro-negative pressure to maintain unidirectional ink flow. Once a leak or abnormal flow path occurs, backflow will occur.
Core reasons for ink backflow
Poor sealing, air entering the system
If the ink cartridges, ink plugs, ink supply tubes, and printhead interfaces in the ink supply system are not properly sealed, air can easily enter the system. The entry of air disrupts the pressure balance of the ink, causing the ink to flow in the reverse direction. Common situations include: the ink cartridge cover is not tightly closed; the connectors are loose or the gaskets are aging; the ink tubes are aging and have fine cracks; the printhead ink inlet is poorly sealed. Besides, all of these can cause the system to draw in air, resulting in backflow.
Sudden pressure changes.
Changes in the machine’s environment, such as a sudden drop in temperature or significant changes in external air pressure. Sudden large-scale ink extraction or aggressive cleaning after prolonged downtime. Repeated machine power cycles and frequent switching of negative pressure/one-way valves. These operations can cause the originally “stable small negative pressure” in the system to suddenly increase or decrease. Causing the ink to be instantly pulled back into the ink cartridge, resulting in backflow.
Ink/pipeline mismatch
If the fluidity and viscosity of the ink itself do not match the machine’s ink supply system, it may also lead to unstable Sublimation Transfer Ink ink supply. When the ink does not flow smoothly in the ink supply tube, intermittent flow and backflow may occur.
How to deal with ink backflow?
Check and restore the sealing of the ink supply system. Focus on checking these areas: Is the ink cartridge cover tightly closed?
Are the dye sublimation ink bags or cartridges damaged? And are the connectors loose? Are there any cracks in the aging ink tubes?
Is the sealing ring at the printhead ink inlet intact? A leak at any point can lead to backflow.
Eliminating air from the ink path: Air is the core factor causing backflow, so the remaining air needs to be expelled. Perform an ink suction operation to refill the ink tubes. Gently press the ink cartridge to release air and restore negative pressure balance; if the print head is severely affected by air, perform a small-scale powerful cleaning (depending on the equipment). The goal is to restore the ink path to a “full ink state” so that the ink supply pressure can be stable.
Confirming whether the ink flow is normal: If the ink viscosity is too high or there is sedimentation. It will cause uneven ink supply and lead to backflow. Suggestions: Check if the ink has exceeded its shelf life; thoroughly shake ink that has been stored for a long time.
Avoid low-temperature environments that can cause the ink to thicken. Once the ink condition returns to normal, the ink supply stability will improve.
