Ink-Filled Cartridge Air Bubble Localization for Discharge Reliability
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Solution Overview
Problem
Ink-filled cartridges with high viscosity curable resin fillers face intermittent discharge issues due to residual air bubbles, which cannot be completely removed by degassing treatments, leading to defects in hole filling processing for printed wiring boards.
Innovation Solution
The ink-filled cartridge design localizes air bubbles within the syringe by accumulating them at specific positions, ensuring a ratio of air bubble volumes that minimizes intermittent discharge, even when the ink is thawed, by maintaining the ink at a temperature of 10°C or lower and using a cartridge configuration where air bubbles are larger than 0.1 mm but less than 0.3 mm in diameter.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If degassing treatment by vacuum degassing or centrifugation is performed to remove air bubbles from high viscosity ink, then air bubble removal is attempted, but it is difficult to completely remove very small amount of air bubbles contained in the ink
Solution Approach 1:
The patent changes the physical state parameter of the ink by storing it in a frozen state at low temperature. This parameter change prevents the curing reaction of the resin and maintains the ink in a stable state where air bubbles do not expand, thereby achieving complete air bubble removal and preventing intermittent discharge during use.
2Stability of the object's composition
If ink is stored frozen to prevent curing reaction, then curing reaction is prevented, but volume of air bubbles increases as temperature changes when ink is thawed for use
Solution Approach 1:
The patent performs preliminary degassing treatment to remove air bubbles from the ink before freezing and storing it in the cartridge. By removing air bubbles in advance when the ink is in a controlled state, the harmful effect of air bubble expansion during subsequent thawing is prevented, ensuring stable discharge performance.
3Ease of operation
If air bubbles are present in ink filled in syringe, then intermittent discharge occurs from syringe at time of use, but complete air bubble removal is difficult due to high viscosity
Solution Approach 1:
The patent changes the temperature parameter by storing the ink in a frozen state during transportation and storage. This parameter change maintains the ink in a stable, non-curing state and prevents air bubble expansion. When ready for use, the ink is thawed to operational temperature, ensuring smooth discharge without intermittent flow caused by air bubbles.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach reduces intermittent discharge and ensures high-quality circuit board production by maintaining the ink at a temperature of 10°C or lower, effectively minimizing air bubble-induced defects in hole filling processes for printed wiring boards.
Implementation Method 1
the ink is stored frozen so that the curing reaction of the resin does not proceed within the syringe, before use
Implementation Method 2
when the ink is thawed for use
Data Source
AI summary
An ink-filled cartridge includes a cartridge, including a cylindrical syringe and a plunger, and an ink therein. The ink has a viscosity at 25° C. of from 50 to 2,000 dPa·s. The ink contains one or more air bubbles having a diameter of 0.1 mm or more. A total volume A of air bubbles in a portion of the syringe corresponding to a distance from a lower end of a discharge nozzle of the cylindrical syringe to a mid-point between the lower end and the plunger, and a total volume B of air bubbles in a portion of the syringe corresponding to a distance from the mid-point to the plunger, satisfy: 0≤A/B<1.0.