Laser-Induced Forward Transfer Coating for Packaging Substrates
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Solution Overview
Problem
Existing coating processes for packaging materials, such as screen printing, flexographic printing, and gravure printing, face limitations in image resolution and layer thickness, and are costly and complex due to the handling and maintenance of printing forms, making them uneconomical.
Innovation Solution
A method using a transparent donor substrate with a donor layer, positioned at a predetermined distance from the substrate, where an energy beam is directed to transfer the donor layer material onto the substrate without contact, allowing for flexible and cost-effective coating of various substrates with adjustable thickness and pattern, using a donor with a pressure-sensitive adhesive and optional additional coatings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If traditional printing methods (screen printing, flexographic printing, gravure printing) are used to coat substrates, then coating can be achieved, but image resolution is limited and layer thickness is limited by equipment constraints
Solution Approach 1:
The patent replaces traditional mechanical printing systems (screens, anilox rollers, printing plates, gravure cylinders) with a laser-based energy beam system. The laser beam directly transfers coating material onto the substrate without mechanical contact, eliminating equipment constraints on layer thickness and image resolution while enabling precise digital control of coating patterns.
Solution Approach 2:
The patent changes the fundamental parameter of material transfer from mechanical contact-based deposition to laser-induced forward transfer. By using laser energy to vaporize and propel coating material, the system achieves variable layer thickness control and high image resolution that are independent of traditional equipment limitations.
2Ease of manufacture
If traditional printing forms (screens, anilox rollers, printing plates, gravure cylinders) are used, then coating can be applied, but purchase, handling, cleaning and storage becomes complex and cost-intensive
Solution Approach 1:
The patent eliminates the need for physical printing forms by using a laser beam as the transfer medium. The digital control system replaces mechanical printing forms, eliminating all associated complexities of purchase, handling, cleaning, and storage while maintaining the ability to apply coatings efficiently.
Solution Approach 2:
The patent uses digital patterns to define the coating geometry instead of physical printing forms. The laser beam transfers material according to digitally controlled patterns, eliminating the need for physical copies (screens, plates, rollers) while maintaining pattern fidelity through digital data.
3Ease of manufacture
If traditional printing methods are used, then coating can be achieved, but production costs are high making printing uneconomical
Solution Approach 1:
The patent replaces expensive traditional printing equipment and forms with a laser-based system that has lower operational costs. The elimination of form manufacturing, handling, and maintenance expenses significantly reduces production costs while maintaining coating quality.
Solution Approach 2:
The patent changes the cost structure by eliminating the need for expensive printing forms and their associated lifecycle costs. The laser-based system converts fixed costs (form purchase and maintenance) into variable operational costs (laser energy and material), resulting in overall cost reduction for coating applications.
4Manufacturing precision
If laser-induced forward transfer is used to transfer material onto substrate, then coating flexibility and precision are improved, but energy consumption increases
Solution Approach 1:
The patent accepts increased energy consumption as a trade-off for achieving precise coating thickness control and pattern definition. The laser energy parameters (power, pulse duration, focus) are precisely controlled to minimize energy waste while achieving the desired coating quality and thickness uniformity.
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 flexible and economical coating of substrates with precise control over coating thickness and pattern, eliminating the need for printing forms and reducing handling costs, while improving adhesion and mechanical properties.
Implementation Method 1
directing at least one energy beam through the first side of the donor substrate onto the donor layer such that a portion of the donor layer is separated from the donor and transferred to the substrate
Data Source
Figure 1~2
Figure 3~4
AI summary
The invention relates to a method for coating a substrate (12) and comprises the steps of providing a donor (18) which has a transparent donor substrate (24) with a first side (24a) and a second side (24b) opposite it, wherein at least one donor layer (26) is arranged on the second side (24b), arranging the donor (18) at a predetermined distance (A) from the substrate (12), wherein the donor layer (26) faces the substrate (12), and directing at least one energy beam (32) through the first side (24a) of the donor substrate (24) onto the donor layer (26) according to an irradiation strategy, such that a portion of the donor layer (26) is separated from the donor (18) and transferred to the substrate (12). The invention further relates to a device (10) for carrying out such a method, as well as a cut and packaging made from a correspondingly produced substrate.