Steel Sheet Coating Apparatus with Step-Wise Curing
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Solution Overview
Problem
Existing steel sheet coating methods, such as spray and dip coating, face challenges in achieving uniform thickness, and roll coating at low temperatures is not suitable for high heat-resistant coatings, leading to increased material costs and obscured surface characteristics.
Innovation Solution
A steel sheet coating apparatus and method that includes a cleaner, polisher, and coater with multiple coating rollers and a curing furnace with varying temperatures to apply a single-layer coated layer, enhancing adhesion and allowing high temperature curing for high heat-resistant coatings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a multi-layer coated structure is used to ensure adhesion and properties, then adhesion between steel sheet and coating is improved, but material cost increases and surface characteristics are obscured
Solution Approach 1:
The invention changes the chemical composition parameters of the coating to create a single-layer coating that achieves both adhesion and desired properties. The coating contains 5-50 wt% silane-modified polymer and 50-95 wt% inorganic oxide, creating a composition that provides inherent adhesion without requiring multiple layers
Solution Approach 2:
The invention uses composite materials by combining silane-modified polymer with inorganic oxide particles in a single-layer coating. This composite structure provides both adhesion properties and the desired coating characteristics, eliminating the need for separate primer and topcoat layers
2Ease of manufacture
If roll coating is performed at low temperature (≤250°C), then coating process is simpler, but high heat-resistant coating properties cannot be achieved
Solution Approach 1:
The invention changes the curing temperature parameter to high temperature (≥300°C) to achieve heat-resistant coating properties. The silane-modified polymer composition is specifically designed to cure at high temperatures, forming a cross-linked network that provides both adhesion and heat resistance in a single layer
Solution Approach 2:
The invention applies local quality by creating a coating with specific regional properties - the silane-modified polymer provides adhesion at the steel sheet interface, while the inorganic oxide provides heat resistance at the coating surface, both within a single-layer structure
3Reliability
If multiple coating layers are applied to achieve desired thickness and properties, then coating performance is improved, but coating thickness uniformity becomes difficult to maintain
Solution Approach 1:
The invention segments the coating functions within a single layer by incorporating both adhesive components (silane-modified polymer) and functional components (inorganic oxide) in one coating application. This eliminates the need for multiple coating passes and layers, maintaining thickness uniformity while achieving desired performance
Solution Approach 2:
The invention merges multiple coating functions (adhesion, heat resistance, and surface properties) into a single-layer coating system. The silane-modified polymer and inorganic oxide work together in one layer to provide all necessary properties, eliminating the need for separate primer and topcoat applications
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 method achieves a thin, uniformly coated single-layer on steel sheets with improved adhesion and surface characteristics, while stabilizing high heat-resistant coatings through step-wise temperature curing, preventing boiling and ensuring desired thickness and properties.
Implementation Method 1
a curing furnace that includes curing chambers that are configured to heat the steel sheet coated with the coating liquid, that have different heating temperatures, and that are configured to cure the coating liquid on the steel sheet based on heating the steel sheet in one chamber having a first temperature and then heating the steel sheet in another chamber having a second temperature greater than the first temperature
Implementation Method 2
a coater that includes a plurality of coating rollers that are configured to coat the polished surface of the steel sheet with coating liquid
Data Source
AI summary
A steel sheet coating method is performed by an apparatus that includes a cleaner configured to apply cleaning liquid to clean a surface of a steel sheet, a polisher that applies polishing liquid to the cleaned surface and includes at least one polishing wheel configured to polish the surface of the steel sheet, a coater that includes a plurality of coating rollers configured to coat the polished surface of the steel sheet with coating liquid, and a curing furnace including curing chambers that are configured to heat the steel sheet coated with the coating liquid, that have different heating temperatures, and that are configured to cure the coating liquid on the steel sheet based on heating the steel sheet in one chamber having a first temperature and then heating the steel sheet in another chamber having a second temperature greater than the first temperature.