Laser Marking Composition Using Transition Metal Oxides
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Solution Overview
Problem
Conventional laser marking methods for products and packaging require high power lasers, which can be expensive, bulky, and risky for thin polymeric films, and may involve hazardous solvents and extensive maintenance.
Innovation Solution
A composition comprising transition metal oxides dispersed in a carrier with alkaline pH and sensitizing compounds, allowing for effective marking with low power lasers, reducing maintenance and risk of puncturing thin films.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If high power lasers are used for laser marking, then marking durability and contrast are improved, but the risk of substrate puncture increases and device cost/complexity increases
Solution Approach 1:
The patent changes the chemical composition parameters of the coating material by incorporating transition metal oxides (such as molybdenum trioxide, tungsten oxide, vanadium oxide) in specific concentrations (0.1-10% w/w). These material parameter changes enable the coating to undergo controlled chemical transformations under low power laser irradiation, producing durable marks without requiring high power that would puncture the substrate
Solution Approach 2:
The patent creates a composite laser-markable coating by combining transition metal oxides with carrier materials (polymers, resins, or inorganic matrices). This composite structure allows the coating to absorb laser energy efficiently and undergo controlled chemical changes that produce durable, high-contrast marks while using low power laser sources, thus avoiding substrate damage
2Manufacturing precision
If high power lasers are used for laser marking, then marking contrast is improved, but device size and cost increase
Solution Approach 1:
The patent modifies the optical and chemical parameters of the coating material by incorporating transition metal oxides that have specific laser absorption characteristics. These material parameter changes increase the efficiency of laser energy conversion and mark formation, allowing low power laser sources to produce high-contrast marks, thereby reducing the power, size, and cost requirements of the laser device
3Ease of operation
If conventional inkjet or thermal transfer printing is used, then marking capability is achieved, but maintenance requirements and downtime increase
Solution Approach 1:
The patent replaces conventional mechanical printing systems (inkjet printers, thermal transfer printers with cartridges and ribbons) with a laser marking system that uses a durable coating applied to the substrate. This substitution eliminates moving parts, print heads, and consumable cartridges that require maintenance, resulting in a maintenance-free marking system with minimal downtime
Solution Approach 2:
The laser-markable coating with transition metal oxides enables the substrate to be marked directly during the manufacturing process without requiring separate printing equipment or consumable replacement. The marking system becomes self-sufficient, eliminating the need for external printing devices and their associated maintenance requirements
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 robust, low-maintenance, and cost-effective laser marking with reduced risk of substrate puncture, using low power sources and avoiding hazardous solvents, while producing durable and reproducible marks.
Implementation Method 1
the laser radiation, and in particular to improved laser-sensitive compositions that may be applied to products or their packaging and which exhibit a colour change when irradiated by a laser
Implementation Method 2
it is believed that effective colour changes occur in the laser markable compositions of the invention when the transition metal undergoes ready changes in oxidation state when the composition undergoes localised heating brought about by laser irradiation
Implementation Method 3
the alkaline medium of the carrier, which typically incorporates ammonia or amine compounds, sensitizes the metal oxide and leads to the formation of complex coloured mixtures of metal oxides and ammonium salts
Implementation Method 4
when the composition undergoes localised heating brought about by laser irradiation
Implementation Method 5
when the composition undergoes localised heating brought about by laser irradiation
Data Source
AI summary
There are described compositions and methods for the laser marking of products or their packaging. The compositions comprise transition metal oxides, saccharides and/or flame-retardant agents, optionally with other additives, dispersed in a carrier.