Gloss Control via Micro-Texture Height Difference
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Solution Overview
Problem
Existing 3D printing methods struggle to achieve a matte, satiny appearance for printed objects due to the glossy nature of cured ink surfaces, which is difficult to control and requires high-resolution scanning and data processing, and is impractical for reproducing the natural micro-texture and gloss of original objects.
Innovation Solution
A method is developed to control the gloss of a printed object's surface by defining a micro-texture with a repetitive pattern of elevated and depressed parts, using a gloss function to determine the required height difference for a target gloss value, and forming this micro-texture on the surface to reduce gloss, allowing for efficient data processing and precise gloss control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If high-resolution scanning is used to reproduce the natural micro-texture of the original object, then the gloss of the printed object can be made similar to the original, but the data processing becomes cumbersome and requires processing a huge amount of data
Solution Approach 1:
The patent segments the complex task of reproducing natural micro-texture into a simplified repetitive pattern of elevated and depressed parts. Instead of processing high-resolution scan data of the entire surface, the method uses a basic micro-texture unit that is repeated across the surface, dramatically reducing data processing requirements while maintaining gloss control effectiveness
Solution Approach 2:
The patent changes the approach from reproducing actual micro-texture geometry to controlling gloss through parameter adjustment. By varying the height difference parameter of the repetitive micro-texture pattern, the method achieves different gloss levels without needing to process or reproduce the complex geometric details of natural surfaces
2Manufacturing precision
If the printing resolution is increased to reproduce fine spatial frequencies of the micro-texture, then the gloss can be controlled more accurately, but the printing process becomes less efficient and more complex
Solution Approach 1:
The method segments the gloss control function into a repetitive micro-texture pattern that can be printed at standard resolutions. The pattern's simplicity allows it to be rendered efficiently without requiring high printing resolution, maintaining productivity while achieving the desired gloss control through the repetitive structure
Solution Approach 2:
The patent moves the gloss control mechanism from the lateral dimensions (fine spatial frequencies requiring high resolution) to the vertical dimension (height difference of the micro-texture). This dimensional shift allows gloss control to be achieved through height variation rather than through fine lateral detail, enabling standard printing resolutions to suffice
3Manufacturing precision
If a micro-texture with small height difference is used to reduce gloss, then the surface appears more matte, but the micro-texture becomes more visible to the naked eye
Solution Approach 1:
The patent applies local quality by creating micro-texture features at a scale specifically adapted to human visual perception. The elevated and depressed parts are sized and spaced to be below the resolution limit of the naked eye under normal viewing conditions, allowing gloss modification without visual detectability of the texture itself
Solution Approach 2:
The method carefully controls the height difference parameter within an optimal range that achieves sufficient gloss reduction (from 20 GU to less than 2 GU) while remaining imperceptible to the human eye. This parameter optimization balances gloss control effectiveness with visual imperceptibility
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
The method effectively reduces the surface gloss of printed objects from 20 gloss units to less than 2 gloss units, achieving a matte appearance while minimizing data processing requirements and maintaining the object's color impression, with the micro-texture being imperceptible to the naked eye.
Implementation Method 1
a gloss function that indicates a gloss value of a surface having said micro-texture, as a function of a height difference between a maximum height of the elevated parts and a minimum height of the depressed parts
Data Source
Figure 1~2L
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AI summary
A method of printing a color surface of an object (12) by printing dots of curable ink in several superposed layers, the method comprising the steps of: defining a micro-texture (28, 30), the micro-texture being a repetitive pattern of elevated parts (32) and depressed parts (34); establishing a gloss function that indicates a gloss value of a surface having said micro-texture, as a function of a height difference (H) between a maximum height of the elevated parts (32) and a minimum height of the depressed parts (34) of the micro-texture; assigning a target gloss value to at least a part of a surface area (22, 24) of the object (12); determining, on the basis of the gloss function, a required local height difference (H) corresponding to the target gloss value; and forming, on said at least one surface area (22, 24) of the object (12), the micro-texture (28, 30) with a height profile scaled to the required local height difference (H).