Laser Marking Cementitious Substrates Without Ink
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Solution Overview
Problem
Existing methods for marking coated substrates, such as ink-jet printing, are costly and prone to equipment failure, making them inconvenient and expensive for use on cementitious building products.
Innovation Solution
A method involving surface treatment of cementitious substrates through etching or radiation to create a watermark that is visible after applying a surface coating, using techniques like laser irradiation to form shallow channels or alter surface roughness, allowing for durable and cost-effective marking without expensive inks or delicate equipment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If ink-jet printing methods are used to mark coated substrates, then visual indicia can be applied to indicate product information, but the equipment requires constant maintenance and is prone to breakdown
Solution Approach 1:
The patent replaces mechanical ink-jet printing systems with a laser-based marking system. The laser beam directly etches or alters the coating material to create permanent markings, eliminating the need for mechanical printing heads, ink cartridges, and associated maintenance. This substitution of mechanical systems with optical/thermal energy delivery resolves the reliability issue while maintaining the ability to apply visual indicia.
Solution Approach 2:
The patent extracts and eliminates the ink delivery system from the marking process. Instead of using ink that is deposited and dried, the marking is achieved through direct laser interaction with the coating material, removing the ink reservoir, pumps, and delivery mechanisms that require maintenance and are prone to failure.
2Loss of information
If ink-jet printing is used to mark substrates, then visual markings can be applied, but expensive inks are required which increase product cost
Solution Approach 1:
The laser marking system replaces the ink substance with optical and thermal energy. The laser beam interacts with the coating material to create markings through ablation, discoloration, or structural changes, eliminating the need for expensive ink materials while achieving the same visual indicia application function.
Solution Approach 2:
The patent uses the substrate's own coating material as the marking medium. Instead of applying expensive external ink, the marking is created by modifying the existing coating through laser energy, effectively using a 'cheap' resource (the substrate itself) rather than expensive consumables.
3Ease of operation
If ink-jet printing heads are used for marking, then visual markings can be applied, but the equipment is delicate and breaks down easily during production
Solution Approach 1:
The patent replaces complex mechanical printing heads with a simplified laser delivery system. The laser beam can be precisely controlled through optical components and computer control, eliminating mechanical moving parts, print heads, and complex alignment mechanisms, thereby reducing device complexity while maintaining ease of operation.
Solution Approach 2:
The laser marking system is self-regulating in that the laser parameters (power, speed, pattern) can be automatically controlled through software, eliminating the need for manual adjustment of mechanical printing parameters. The system adapts to different marking requirements through programmable control rather than mechanical reconfiguration.
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
Enables durable and cost-effective marking of cementitious substrates by creating a visually perceptible watermark that is masked by subsequent coatings, reducing the need for expensive inks and minimizing equipment maintenance, while maintaining the substrate's integrity.
Implementation Method 1
treating at least a portion of an uncoated cementitious substrate to form indicia
Implementation Method 2
etching the surface to form said indicia
Implementation Method 3
The resulting watermark may also be described as a surface relief pattern... which is visually perceptible once a surface coating is applied over the impressed/embossed/etched region of the substrate
Implementation Method 4
The watermark is a recognizable image or pattern which is best revealed in various shades of lightness/darkness when viewed in reflected light
Data Source
AI summary
The present invention relates to methods for marking a coated substrate. In particular, the present invention relates to methods for marking a coated substantially cementitious substrate in the form of a cementitious building product. The method comprises the steps of treating at least a portion of an uncoated cementitious substrate to form indicia; and applying a surface coating on said cementitious substrate to at least partially cover said indicia such that a marking is formed.