Method of applying powder to a substrate during a continuous process
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Solution Overview
Problem
Existing powder applicators in continuous process lines face challenges with powder control, efficiency, and clogging due to clumping, especially when applying powders to substrates in a continuous process, leading to waste and disruptions in the production line.
Innovation Solution
A recirculating powder applicator with a design featuring an inlet and outlet passage through the applicator body, a powder conduit, air inlet, and circulation chamber, where air recirculates a portion of the powder to ensure efficient deposition and minimize clumping, using a metered flow of powder and air pressure to achieve precise application.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If powder is applied to substrate in continuous process, then productivity is improved, but powder control and uniformity deteriorate due to clumping and dispersion issues
Solution Approach 1:
The patent uses a fluidized bed system where air is introduced to fluidize the powder, creating a controlled suspension that improves powder control during continuous application. The air flow prevents clumping while maintaining continuous operation, resolving the contradiction between productivity and uniformity.
Solution Approach 2:
The patent introduces air as an intermediary medium between the powder and substrate. This air medium fluidizes the powder and controls its delivery, enabling precise powder application during continuous processing without direct mechanical contact that would cause clumping.
2Area of stationary object
If powder is dispersed in air for application, then application coverage is improved, but powder control deteriorates due to difficulty in managing dispersed particles
Solution Approach 1:
The system uses controlled air flow to disperse and deliver powder to the substrate. The pneumatic system maintains powder in a fluidized state for coverage while controlling the air flow rate and distribution to prevent unmanageable dispersion, balancing coverage area with operational control.
3Ease of operation
If powder is exposed to moisture during application, then powder becomes easier to handle, but clumping occurs that disrupts continuous process
Solution Approach 1:
The fluidized bed system uses air flow to keep powder suspended and prevent moisture contact that would cause clumping. The continuous air flow maintains powder in a free-flowing state, improving handleability while preventing the clumping that would disrupt continuous operation.
Solution Approach 2:
The system maintains continuous air flow through the powder bed throughout the application process. This continuous pneumatic action prevents moisture exposure and clumping formation, ensuring both ease of operation and uninterrupted continuous process operation.
4Device complexity
If traditional powder applicator is used, then device simplicity is maintained, but powder waste increases due to inefficient application and clumping
Solution Approach 1:
The fluidized bed applicator uses pneumatic principles to achieve superior powder control and application efficiency. The air-fluidized powder bed enables precise delivery with minimal waste, justifying the increased device complexity through significant reduction in powder loss.
Solution Approach 2:
The system incorporates sensors and controls that monitor powder flow and application rates, providing feedback to optimize the fluidization air flow and powder delivery. This feedback mechanism minimizes powder waste by ensuring efficient application while maintaining the continuous 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
The solution enables over 95% of the powder to be effectively deposited on the substrate, reducing waste and preventing clogging, while maintaining a controlled and uniform application, even during long continuous processes, thus enhancing production efficiency and preventing disruptions.
Implementation Method 1
providing between 15 and 100 psi of air through an air inlet of the powder applicator
Implementation Method 2
the air recirculates a second portion of the powder within a circulation chamber of the powder applicator
Implementation Method 3
a depression formed around the exhaust aperture... the exhausted gas contains less than 5% of the powder dispersed within the air
Data Source
AI summary
A recirculating powder applicator includes an applicator body having an inlet on an upstream surface and an outlet on a downstream surface, wherein the inlet and outlet define a passage that extends transversely through the thickness of the applicator body, a powder conduit, an air inlet, an exhaust aperture located on one of the upstream or downstream surfaces, and a circulation chamber located on the interior of the applicator body. The powder conduit and air inlet are in fluid communication with the passage and the passage is in fluid communication with the circulation chamber. A method of applying powder to a substrate during a continuous process includes using a recirculating powder applicator.