Inkjet Printhead Scanning for 3D Coating Thickness
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Solution Overview
Problem
Existing ink jet printing technologies face challenges in achieving a predetermined film thickness on three-dimensional printing media efficiently, leading to increased time consumption due to the need for high resolution and precise ink discharge mechanisms, especially on surfaces with large angles of inclination or curved surfaces.
Innovation Solution
The method involves differentiating head-facing and non-head-facing areas on the printing medium during scanning processes, adjusting ink discharge amounts to ensure the non-head-facing areas achieve the same film thickness as head-facing areas, and optimizing ink distribution across multiple scanning processes to reduce positioning actions and enhance printing speed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the ink discharge amount is increased on segments with large angles of inclination to prevent clearance formation, then the coating thickness is improved, but the printing speed is lowered
Solution Approach 1:
The patent applies local quality by differentiating ink discharge strategies based on surface orientation. Head-facing areas receive standard ink discharge, while non-head-facing areas receive adjusted ink discharge to compensate for geometric factors. This localized adaptation ensures uniform coating thickness without uniformly increasing discharge across the entire surface, thereby maintaining printing speed.
Solution Approach 2:
The patent changes the ink discharge parameter dynamically based on the scanning process and surface orientation. By adjusting the discharge amount as a variable parameter rather than using a fixed high discharge rate, the system achieves uniform coating thickness on inclined surfaces while avoiding the penalty of consistently reduced printing speed.
2Manufacturing precision
If the printing medium is rotated to face all surfaces straight toward the printhead, then the coating thickness is improved, but the positioning time is increased
Solution Approach 1:
The patent segments the printing process into multiple scanning passes, with each pass handling different surface orientations. Instead of rotating the medium to face all surfaces straight toward the printhead, the system performs sequential scanning where head-facing and non-head-facing areas are processed in different passes, eliminating the need for repeated positioning operations.
Solution Approach 2:
The patent performs preliminary differentiation of areas into head-facing and non-head-facing zones before executing the ink discharge. This preliminary classification allows the system to pre-plan the scanning sequence and ink discharge amounts, avoiding the need for time-consuming real-time positioning adjustments during the printing process.
3Manufacturing precision
If high resolution and reduced ink landing interval are implemented to prevent coating thinning, then the coating thickness is improved, but the printing speed is lowered
Solution Approach 1:
The patent applies local quality by differentiating ink discharge strategies based on surface orientation. Head-facing areas receive standard ink discharge, while non-head-facing areas receive adjusted ink discharge to compensate for geometric factors. This localized adaptation ensures uniform coating thickness without uniformly increasing discharge across the entire surface, thereby maintaining printing speed.
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 allows for the formation of an ink coating with a predetermined film thickness on three-dimensional surfaces in shorter time without requiring advanced mechanisms for high resolution or increased ink discharge, thereby reducing printing time and improving image quality.
Implementation Method 1
scanning with a printhead for ink jet printing and discharging ink to a printing medium from the printhead
Data Source
AI summary
The invention aims to form an ink coating having a predetermined film thickness on a surface of a printing medium having a three-dimensional structure in shorter time. As solving means, a plurality of times of scanning process is included, ink 80 is discharged to head-facing areas (10a, 10c) in a state of facing straight toward a printhead 110 in one scanning process, and the ink 80 is discharged to a non-head-facing area (10b) so that the total film thickness of the ink coatings (11, 12) to be formed without facing straight toward the printhead 110 in two or more times of the scanning process becomes a predetermined film thickness T0.