Frosted Glass Enamel Composition for Wide Firing Range
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Solution Overview
Problem
Conventional methods for achieving a frosted appearance on glass containers, such as physical and chemical etching, are laborious, costly, and involve harsh chemicals, while simulating the hydrofluoric acid-etch effect has been challenging, especially in replicating the smooth texture and appearance of genuine acid-etched glass.
Innovation Solution
A lead-free and cadmium-free glass enamel composition comprising a reactive glass frit and a crystalline material, applied to a glass substrate and fired at a temperature of 550°C to 700°C, which imparts a matte or translucent appearance without the drawbacks of traditional etching methods, allowing for a wider firing temperature range and consistent properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If physical etching (sandblasting) is used to create frosted appearance, then the frosted effect is achieved, but the bottle strength is weakened and breakage increases
Solution Approach 1:
The patent applies an enamel coating that copies the visual appearance of sandblasted frosted glass without replicating the mechanical damage. The coating creates an optical illusion of etching while preserving the intact glass substrate, thereby achieving the desired aesthetic without compromising structural integrity.
2Shape
If chemical etching with hydrofluoric acid is used to create frosted appearance, then the frosted effect is achieved, but harsh chemicals are used and waste disposal costs increase
Solution Approach 1:
The patent replaces the harmful chemical etching process with a benign enamel coating application. Instead of using hydrofluoric acid that creates hazardous waste, the invention uses a safe firing process that cures the enamel coating to achieve the same visual effect without environmental or safety hazards.
3Shape
If conventional enamel composition is fired to produce frosted appearance, then the coating is applied, but the firing temperature must be tightly controlled
Solution Approach 1:
The patent modifies the enamel composition parameters (specific ratios of glass frit, crystalline material, and colorants) to create a formulation that is less sensitive to firing temperature variations. This compositional adjustment allows the enamel to cure properly and produce consistent frosted effects across a broader temperature range, reducing the need for precise temperature control.
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 provides a consistent frosted appearance with controlled gloss, light transmittance, and surface roughness over a broad firing range, reducing operational complexity and costs associated with traditional etching methods while avoiding the use of hazardous materials.
Implementation Method 1
The enamel is applied to a substrate, for example, a glass bottle, and subsequently fired to fuse the frit (and burn off the organic vehicle, if one is used), thus bonding the enamel coating to the substrate.
Implementation Method 2
fired to fuse the frit (and burn off the organic vehicle, if one is used), thus bonding the enamel coating to the substrate
Data Source
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AI summary
The invention provides an enamel composition that imparts a frosted appearance to glass articles such as bottles and windows while allowing a wide firing range and maintaining consistent properties such as gloss and light transmittance. The composition comprises a zinc borosilicate glass frit with one or more crystalline materials added thereto.