Non-Stick Cookware Coating with Hard Enamel for Scratch Resistance
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Solution Overview
Problem
Conventional non-stick coatings on cooking utensils are fragile and lack sufficient corrosion resistance, making them prone to scratches and chemical attacks, and existing reinforcement methods are costly, energy-intensive, and inefficient.
Innovation Solution
A cooking utensil with a hard rough enamel base between the substrate and non-stick coating, comprising a fluorocarbon resin layer with a heat-stable binder, where the enamel base has a specific composition and surface roughness to enhance adhesion and resistance, formed using an aqueous enamel frit slip and curing process that does not require complex or energy-consuming equipment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a non-stick coating is applied to the inner surface of a cooking utensil, then non-stick properties are achieved, but the coating becomes fragile and prone to scratches
Solution Approach 1:
The patent applies a multilayer composite coating system consisting of a primer layer containing sintered fluorocarbon resin (PTFE) combined with mineral or hard organic fillers (silica, quartz, or aluminium), topped with additional non-stick layers. This composite structure combines the low-friction non-stick properties of fluorocarbon resin with the high hardness and scratch resistance of mineral fillers, resolving the contradiction between non-stick performance and mechanical durability
Solution Approach 2:
The primer layer is formulated with a specific local composition different from the top layers: it contains sintered fluorocarbon resin particles mixed with hard fillers (15-40% by weight of mineral or hard organic fillers) and a binder resin. This localized variation in composition provides the base layer with enhanced mechanical strength and scratch resistance while the upper layers maintain the non-stick surface properties
2Strength
If the filler content in the primer layer is increased to reinforce mechanical properties, then scratch resistance improves, but the layer loses its cohesion
Solution Approach 1:
The patent optimizes the filler content parameter within a specific range of 15-40% by weight in the primer layer. This parameter optimization ensures sufficient scratch resistance while maintaining layer cohesion. Additionally, the binder resin content and type are adjusted to match the filler load, and the sintered fluorocarbon resin particle size and distribution are controlled to prevent aggregation and maintain structural integrity at optimal filler concentrations
3Strength
If a hard sub-layer or hard base is formed between the substrate and non-stick coating to reinforce mechanically, then scratch resistance improves, but the process becomes costly and energy-intensive
Solution Approach 1:
The patent merges the function of the hard reinforcing layer with the primer layer itself. The primer layer is formulated to simultaneously provide adhesion to the substrate, mechanical reinforcement through hard fillers, and a bonding surface for the top non-stick layers. This consolidation eliminates the need for separate hard base formation processes such as anodization or electric-arc spraying, reducing manufacturing complexity and energy consumption while maintaining scratch resistance
Solution Approach 2:
The primer layer is designed as a multi-functional layer that performs multiple roles: (1) provides adhesion to the metal substrate through chemical bonding, (2) offers mechanical reinforcement and scratch resistance via hard fillers, (3) creates a suitable surface for bonding top non-stick layers, and (4) contributes to the overall non-stick performance. This multi-functionality eliminates the need for separate specialized layers or complex manufacturing processes
4Strength
If alumina hard base is formed by anode oxidation to provide scratch resistance, then mechanical reinforcement is achieved, but corrosion resistance decreases and the process becomes costly
Solution Approach 1:
The patent uses a composite primer layer formulation combining sintered fluorocarbon resin particles with hard organic or mineral fillers (such as silica, quartz, or aluminum) dispersed in a binder resin. This composite structure provides both scratch resistance from the hard fillers and corrosion resistance from the fluorocarbon resin matrix, which forms a chemically inert barrier layer that protects the underlying substrate from detergent attack and moisture, unlike porous anodized alumina
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 significantly improves the mechanical, chemical, and physical performance of the non-stick coating, increasing scratch resistance by at least five times while maintaining non-stick properties and providing corrosion protection without the need for costly or energy-intensive processes.
Implementation Method 1
a coating is used containing a sintered fluorocarbon resin (e.g. PTFE)
Implementation Method 2
a hard rough base in enamel, between the inner surface of the utensil and the non-stick coating
Implementation Method 3
a fluorocarbon resin layer with a heat-stable binder
Data Source
AI summary
The present disclosure relates to a culinary article including a metal substrate having a concave inner face intended to be placed on a side in which food can be introduced into the article and a convex outer face intended to be placed facing a heat source. The inner face being coated in succession, starting from the substrate, with a hard enamel base, which is rough and contains no lead or cadmium, and then with a non-stick coating covering the hard layer. The present disclosure also relates to a method of manufacturing such an article.