Disc-Shaped Glass Coating for Damage-Free Double-Sided Firing

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Solution Overview

Problem

Existing methods for applying glass-based coatings on both sides of a glass substrate result in deformation and damage due to high temperatures, especially when a second coating is fired on a first coating resting on a base plate, leading to partial melting and adhesion to the base plate.

Innovation Solution

The application of coatings with temperature-stable particles having an average particle size to layer thickness ratio (V = P/d) of at most 1 and at least 0.01, minimizing contact area and preventing damage during firing by using inert materials.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If a first coating is applied by heating on a glass substrate and then a second coating is fired on the first coating resting on a base plate, then both side surfaces can be coated, but the first coating suffers damage including partial melting and adhesion to the base plate

Engineering Contradiction:

Improvecoating application capabilityVSAvoidcoating integrity

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

A release layer is introduced between the first coating and the base plate to prevent direct contact. This intermediary layer allows thermal energy to pass through for heating the first coating while preventing mechanical adhesion and chemical reactions between the coating and base plate, thus resolving the contradiction between coating application capability and coating integrity

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The system is segmented into distinct functional layers: the base plate, the release layer, and the first coating. This segmentation allows each component to perform its specific function independently - the base plate provides structural support, the release layer prevents adhesion, and the coating provides the desired surface properties, thereby maintaining coating integrity during the heating process

Inventive Principle:

Principle #1Segmentation

2Reliability

If particles are integrated into the first coating to create elevations for preventing damage during firing, then coating protection is improved, but the coating surface becomes very rough with Ra in the double-digit micrometer range

Engineering Contradiction:

Improvecoating protectionVSAvoidsurface roughness

Core Design Contradiction:

ReliabilityVSManufacturing precision

Solution Approach 1:

The particle size parameter is optimized to a specific range that provides sufficient protection during firing while maintaining an acceptable surface finish. By carefully controlling the particle dimensions and distribution, the solution achieves a balance between coating protection and surface smoothness, avoiding the double-digit micrometer roughness caused by larger particles

Inventive Principle:

Principle #35Parameter changes

3Ease of manufacture

If the glass substrate is heated to very high temperatures above or close to the glass transition temperature for firing glass-based coatings, then the coating can be properly applied, but the glass substrate becomes deformable

Engineering Contradiction:

Improvecoating applicationVSAvoidsubstrate deformation

Core Design Contradiction:

Ease of manufactureVSShape

Solution Approach 1:

The release layer acts as a mediator that enables the heating process to proceed at high temperatures necessary for proper coating application while preventing the glass substrate from deforming. The layer allows thermal energy transmission while providing a stable interface that maintains substrate shape during the firing process

Inventive Principle:

Principle #24Intermediary (Mediator)

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 configuration achieves a non-stick effect, reduces mechanical stress, and allows for lower layer thicknesses with improved adhesion and scratch resistance, while maintaining the integrity of the glass element.

Implementation Method 1

The transformation temperature T g is generally determined by the intersection point of the tangents to the two branches of the expansion curve when measured at a heating rate of 5 K/min

Methodology Applied

Scientific EffectThermal expansion: Thermal Expansion

Implementation Method 2

using inert materials

Methodology Applied

Scientific EffectChemical inertness:

Implementation Method 3

coatings that are obtained by heating are to be applied to both sides of such a glass substrate

Methodology Applied

Scientific EffectThermal conduction: Conduction (thermal)

Data Source

PatentEP4613720A1Disc-shaped glass element, paste and method for the production thereof, use thereof and domestic appliance comprising such a glass element

Publication Date: 2025.09.10 SCHOTT AG

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AI summary

The present disclosure generally relates to a single-pane glass element having two side surfaces and a peripheral edge surface, each of which comprises at least one coating applied by heating on both side surfaces, a method for its production, and a household appliance comprising the pane-shaped glass element. A further aspect relates to the use of such a glass element.