CARC Coating Applicator Nitrogen Purging and Preheating
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Solution Overview
Problem
Existing methods for applying touch-up CARC coatings are limited by the need for two-component mixing and difficulty in maintaining moisture exclusion during aerosol can filling, leading to degradation and inefficiencies in application, especially in military contexts where survivability and camouflage are critical.
Innovation Solution
The use of trigger and pump sprayers with a multi-stage agitation system and airless, non-propellant transference through a restricted orifice nozzle, along with preheating and nitrogen purging to prevent degradation, allows for convenient and effective application of single-component polymeric coatings, including CARC, while minimizing sediment formation and ensuring consistent atomization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If two-component CARC coating is used, then coating performance is improved, but device complexity and ease of operation deteriorate due to mixing requirements
Solution Approach 1:
The coating system is segmented into single-component formulations that can be applied independently, eliminating the need for on-site mixing of multiple components. Each component (base coat and clear coat) is provided as separate single-component systems that can be applied independently and cured separately.
Solution Approach 2:
The coating chemistry is changed from two-component systems to single-component systems with modified cure mechanisms. The single-component coatings use alternative curing methods such as UV curing or moisture curing that eliminate the need for component mixing while maintaining coating performance.
2Ease of manufacture
If traditional aerosol can filling is used, then ease of manufacture is improved, but reliability deteriorates due to moisture exposure and coating degradation
Solution Approach 1:
An inert atmosphere (nitrogen or carbon dioxide) is used to displace moisture and oxygen during the aerosol can filling process. This prevents moisture exposure to the coating material, eliminating degradation pathways while maintaining the ease of conventional aerosol filling operations.
Solution Approach 2:
The coating material is pre-prepared and pre-packaged in single-component formulations that are already protected from moisture. This preliminary protection eliminates the need for complex moisture-exclusion measures during filling, maintaining ease of manufacture while ensuring coating integrity.
3Productivity
If aerosol spray applicator is used, then productivity is improved, but device complexity and reliability worsen due to angle limitations and clogging
Solution Approach 1:
The spray applicator uses a dynamic pump mechanism that can be actuated in any orientation. The pump system adapts to different holding angles and positions, eliminating the 45-degree angle limitation of static aerosol systems. The dynamic actuation allows the user to position the applicator however needed for optimal coverage.
Solution Approach 2:
An intermediary pump mechanism is introduced between the coating reservoir and the spray nozzle. This pump system acts as a mediator that prevents direct contact between the coating material and the spray chamber, reducing clogging issues while maintaining aerosol-like application efficiency.
4Ease of operation
If single-component moisture cure CARC coating is used, then ease of operation is improved, but reliability worsens due to moisture exposure during filling
Solution Approach 1:
An inert atmosphere (nitrogen or carbon dioxide) is used to displace moisture during the aerosol can filling process. This prevents premature moisture exposure to the single-component moisture-cure coating, ensuring the coating remains stable during storage and application while maintaining ease of use.
Solution Approach 2:
The coating formulation is modified to use alternative cure mechanisms such as UV curing or controlled moisture curing. These parameter changes allow the coating to remain stable in single-component form during storage and application, eliminating the need for strict moisture exclusion while maintaining cure integrity.
Data Source
AI summary
A method of filling CARC (chemical agent resistant coating) applicators ensures integrity of the CARC paint. The method incorporates the steps of the steps of pre-priming a container and applicator with a solvent to ensure evacuation of air; pre-reducing the chemical agent resistant coating with a reduction thinning agent to a final viscosity such that the final assembled applicator produces an atomization mist suitable to apply said coating; agitating the pre-reduced coating on a paint shaker; continuously purging a hermetically sealed chamber with nitrogen or another dry inert gas; preheating all items that will come in direct contact with said coating to eliminate any residual moisture within each item; assembling said dry preheated items and immediately transferring them into said chamber inserting steel sphere agitation units into a dried container, such that each container contains three small spheres and one large sphere; transferring the coating into said chamber prior to opening said container; filling said container; and purging the filled container with nitrogen or other inert gas then immediately sealing said container and removing it from said chamber.