Laminated Non-Stick Cookware Coating for Thick Film Adhesion
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Solution Overview
Problem
Existing methods for applying non-stick coatings to cooking utensils, such as spray coating and high-impact bonding, face limitations in achieving thick, non-porous layers with good adhesion to various metal substrates, particularly stainless steel, and struggle with precision control of process conditions, leading to reduced durability and resilience against scratches and heat transfer issues.
Innovation Solution
A method involving the formation of a multilayer stack comprising a non-stick film and a metal substrate, where pressure is applied at room temperature followed by heating to laminate the stack, allowing for thicker non-stick films (0.003-0.009 inches) with improved adhesion and reduced porosity, enabling the use of stainless steel substrates and precise control of lamination conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If spray coating process is used to apply non-stick surface, then coating can be applied quickly, but the coating becomes porous and uneven in thickness
Solution Approach 1:
The patent replaces the spray coating mechanical system with a lamination process where a pre-formed polymer layer is bonded to the metal substrate through heat and pressure. This substitution eliminates the porosity and thickness uniformity issues inherent in spray coating while maintaining efficient production capability.
Solution Approach 2:
The polymer non-stick layer is pre-formed to the desired thickness and uniformity before being applied to the metal substrate. This preliminary preparation ensures consistent coating quality without the defects associated with spray coating, as the layer is manufactured separately with precise control over thickness and density.
2Strength
If non-stick coating thickness is increased above 0.002 inches, then protection against scratches improves, but solvent becomes trapped and adhesion decreases
Solution Approach 1:
The patent replaces the solvent-based spray coating system with a lamination process that uses heat and pressure to bond a pre-formed polymer layer. This substitution allows thicknesses greater than 0.002 inches without trapping solvent, as the polymer layer is applied without solvent and bonded through thermal-mechanical means.
Solution Approach 2:
The patent changes the bonding parameters from solvent evaporation at low temperature to heat and pressure application at elevated temperatures (typically 100-200°C). This parameter change enables the use of thicker polymer layers without adhesion problems, as the bonding mechanism does not rely on solvent removal.
3Productivity
If high impact bonding method is used, then bonding speed is fast, but it is difficult to achieve sufficient heat transfer through thicker polymer film
Solution Approach 1:
The patent employs a dynamic bonding process where heat and pressure are applied simultaneously and maintained for a controlled duration. This dynamic approach allows adjustment of process parameters based on polymer layer thickness, enabling effective bonding of thicker films while maintaining efficient production rates.
Solution Approach 2:
The patent uses a composite structure consisting of a metal substrate and a polymer non-stick layer bonded through controlled heat and pressure. This composite approach allows optimization of each layer's properties and the bonding interface, achieving both adequate heat transfer and bonding speed for thicker polymer films.
4Adaptability or versatility
If spray coating is applied after shaping the cooking utensil, then coating can be applied to complex geometries, but uneven distribution of coating occurs in corners and sidewalls
Solution Approach 1:
The patent applies the polymer non-stick layer to the metal substrate before shaping the cooking utensil. This preliminary lamination ensures uniform coating distribution across all surfaces, including corners and sidewalls, as the flat layers are bonded before the substrate is formed into its final complex geometry.
Solution Approach 2:
The patent separates the coating application step from the shaping step by laminating the polymer layer to the flat metal substrate first, then shaping the combined laminate. This segmentation allows uniform coating application on flat surfaces while accommodating complex final geometries without coating defects.
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 results in non-stick cooking utensils with enhanced durability, resistance to scratches, and improved heat transfer, as well as the ability to bond non-stick films to stainless steel, overcoming the limitations of existing techniques by achieving thicker, non-porous coatings with better adhesion and process control.
Implementation Method 1
heating the entire multilayer stack to form a laminate
Implementation Method 2
heating the entire multilayer stack to form a laminate
Implementation Method 3
applying pressure to the multilayer stack at room temperature
Data Source
AI summary
A method of making a cooking utensil and a cooking utensil made using the same. In some embodiments, a method of making a cooking utensil includes applying pressure and heat to a multilayer stack to form a laminate, the multilayer stack including a metal substrate and a first polymer film.