Coating Apparatus for Monolayer Metallic Particle Transfer
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Solution Overview
Problem
Conventional methods for applying metallic or metal-looking coatings to surfaces are wasteful and inefficient, as most of the coating remains on the carrier after use, leading to high costs due to the need for frequent replacement.
Innovation Solution
A coating apparatus that applies a monolayer of metallic or metal-looking particles to a donor surface using a fluid suspension, with a surplus extraction system to remove particles not in direct contact, allowing the donor surface to be recoated without increasing thickness, and a dryer to ensure the coating is ready for transfer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of substance
If a conventional film coated carrier is used for printing, then the coating can be applied to the substrate, but most of the film coating remains on the carrier after use, leading to waste and high costs
Solution Approach 1:
The invention changes the physical state and distribution parameters of the coating by applying it as a suspended fluid that forms a monolayer on the carrier surface. The fluid carrier allows precise control of coating thickness and distribution, enabling complete particle transfer to the substrate while the carrier can be recoated. This transforms the coating from a bulk film that remains on the carrier to a controlled monolayer that fully transfers.
Solution Approach 2:
The invention extracts only the necessary amount of coating material (a monolayer of particles) from the fluid suspension and applies it to the carrier surface. The fluid carrier is then completely removed after transfer, leaving no residual coating on the carrier. This extraction principle ensures that 100% of the applied coating material is utilized and transferred to the substrate.
2Quantity of substance
If multiple layers of particles are applied to the donor surface, then complete coverage is achieved, but the coating thickness increases and particles build up on areas not transferred to the substrate
Solution Approach 1:
The invention applies a slight excess of particles in fluid suspension to ensure complete coverage of the donor surface, then uses the fluid extraction system to remove the excess. This approach ensures 100% coverage is achieved while preventing particle buildup, as the fluid carrier allows precise control and removal of any surplus particles that are not needed for the monolayer.
Solution Approach 2:
The invention uses a fluid (liquid or gas) carrier to transport and distribute particles onto the donor surface. The fluid properties enable uniform distribution and precise control of particle placement. After application, the fluid is extracted using pneumatic or hydraulic means, leaving only the desired monolayer of particles on the surface without buildup in non-transferred areas.
3Duration of action of stationary object
If the donor surface is recoated after particle transfer, then exposed regions can be reused, but the process complexity increases
Solution Approach 1:
The invention enables continuous operation by allowing the carrier to be immediately recoated after particle transfer. The fluid suspension system and rapid extraction capability allow the donor surface to be prepared for the next printing cycle without interruption or complex regeneration processes. This continuous action maximizes carrier utilization and eliminates downtime between printing jobs.
Solution Approach 2:
The carrier surface automatically becomes ready for recoating after particle transfer because the fluid carrier is completely removed and the surface is left clean and exposed. No additional cleaning or preparation steps are needed - the carrier serves itself by being naturally prepared for the next coating cycle through the complete transfer and removal process.
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 the reuse of the donor surface by applying a monolayer of particles efficiently, reducing waste and costs, while maintaining the quality of the transferred coating on the substrate.
Implementation Method 1
the particles adhering more strongly to the donor surface than to one another
Implementation Method 2
a surplus extraction system operative to extract fluid and remove surplus particles that are not in direct contact with the surface
Implementation Method 3
a dryer to ensure the coating is ready for transfer
Data Source
Figure 1
Figure 2
Figure 3~4
AI summary
An apparatus is disclosed for coating a surface that is movable relative to the apparatus with a layer of metallic particles or particles having a metal-like appearance and reflectivity, the particles adhering more strongly to the surface than to one another. The apparatus comprises at least one spray head 1401 for directly or indirectly applying to the surface 12 a fluid stream within which the particles are suspended, a housing 1403 surrounding the spray head(s) 1401 and defining an interior plenum 1406 for confining the fluid stream, the housing having a rim 1404 adjacent the surface that is configured to prevent egress of particles from a sealing gap defined between the rim of the housing and the surface to be coated, and a suction source connected to the housing to extract from the plenum the sprayed fluid and particles suspended in the sprayed fluid. In operation, the suction source extracts substantially all particles that are not in direct contact with the surface, so as to leave only a substantially single particle layer adhering to the surface on exiting the apparatus.