Continuous Pipe Coating Process with Segmented Curing
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Solution Overview
Problem
Coating large or heavy work pieces is laborious, energy-intensive, and time-consuming, with existing methods limiting throughput due to coating and cure times, and often requiring additional production steps and increased energy consumption.
Innovation Solution
A method involving translating a substrate through a spray zone to apply a fluid coating, followed by heating to form a cured coating, allowing for efficient coating of both sides of the substrate while moving, thereby reducing overall processing time and energy consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the substrate is coated and then set in a rack to dry or cure before coating the remainder, then the coating quality is improved, but the production time and rack space requirements increase
Solution Approach 1:
The substrate is conveyed continuously through the coating line, with multiple spray booths applying coating to different surfaces in sequence without interruption. The curing process occurs continuously as the substrate moves through heated zones, eliminating the need for stopping and rack drying. This continuous operation maintains coating quality while significantly reducing production time compared to batch processing with rack drying between coats.
Solution Approach 2:
The patent combines multiple coating applications and curing processes into a single continuous operation. Multiple spray booths apply different coats (primer, intermediate, finish) in sequence, and heating zones are integrated throughout the line to cure the coating continuously as the substrate moves, rather than separating these operations into distinct batch processes requiring rack storage.
2Speed
If curing temperatures are increased to speed up handling, then the handling time is reduced, but the coating quality and energy consumption are adversely affected
Solution Approach 1:
The curing process is divided into multiple heating zones distributed throughout the coating line, each providing moderate heat. This segmentation allows the substrate to be cured progressively as it moves through each zone, achieving full curing at lower temperatures than a single high-temperature zone would require, thereby maintaining coating quality while enabling faster throughput.
Solution Approach 2:
The substrate receives preliminary heating in early zones before subsequent coating applications, and continues receiving heat through later zones as it progresses through the line. This preliminary and continuous heating action ensures the coating cures properly at moderate temperatures throughout the process, rather than requiring a single high-temperature spike that would compromise quality.
3Manufacturing precision
If multiple coating passes are applied to ensure complete coverage, then the coating completeness is improved, but the energy consumption and processing time increase
Solution Approach 1:
The patent applies coating in multiple spatial dimensions by using several spray booths positioned at different locations along the conveyance path, each targeting different surfaces or areas of the substrate. This multi-dimensional approach ensures complete coverage through sequential application rather than requiring multiple passes of the same spray booth, thereby reducing the total number of heating cycles needed and lowering energy consumption.
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
This method enables quick curing of coatings, facilitating easier handling and managing workload and energy consumption, while maintaining coating quality by efficiently applying and curing coatings on both sides of the substrate during a single processing pass.
Implementation Method 1
spraying a fluid coating onto the first uncoated surface portion of the substrate to produce a first coated surface portion
Implementation Method 2
heating at least the first coated surface portion to form a first cured coating of the substrate
Data Source
AI summary
A substrate coating method may include: translating the substrate in a first direction through a spray zone while spraying a fluid coating on a first uncoated surface portion to produce a first coated surface portion; heating at least the first coated surface portion to form a first cured coating while translating the substrate through the heating zone in the first direction and a second, opposite direction; manipulating a second uncoated surface portion in a position to be spray-coated; spraying the fluid coating onto the second uncoated surface portion while translating the substrate in the first direction through the spray zone to produce a second coated surface portion; and heating at least the second coated surface portion to form a second cured coating while translating the substrate in the first direction through the heating zone. The method may thereby provide the substrate with the first and second cured coatings.