Fire Door Glass Panel with Low Emissivity Coating
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Solution Overview
Problem
Conventional glass panels for fire doors are expensive and do not meet international fire resistance standards, as they require fireproof glass sheets that increase costs.
Innovation Solution
A single or double glazed glass panel with a heat reflecting coating of low emissivity applied to heat strengthened or thermally strengthened glass sheets, which reflects heat back to the flame, preventing temperature differences and strain within the glass, thus passing the ISO 834 flame insulating performance test at a lower cost.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If fireproof glass sheets are used to ensure fire resistance, then fireproof performance is improved, but manufacturing cost increases
Solution Approach 1:
The patent replaces expensive fireproof glass sheets with a combination of ordinary glass sheets and heat reflecting coatings. The coating system provides the necessary fire resistance at lower cost, effectively substituting costly specialized materials with cheaper alternatives that achieve the same functional outcome.
Solution Approach 2:
The patent creates a composite structure by applying multiple layers of heat reflecting coatings (including low emissivity coatings and silver coatings) onto ordinary glass sheets. This composite approach combines the base glass material with functional coatings to achieve fire resistance without using expensive fireproof glass throughout.
2Reliability
If heat reflecting coating with low emissivity is applied to heat strengthened glass sheets, then fire resistance is achieved, but manufacturing complexity increases
Solution Approach 1:
The patent modifies the surface properties of ordinary glass sheets by applying heat reflecting coatings with specific emissivity parameters (low emissivity coatings with emissivity of 0.82 or less, and silver coatings with emissivity of 0.05 or less). By changing the thermal radiation parameters through coating application, the patent achieves fire resistance without altering the fundamental glass material properties.
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 allows for inexpensive fire doors that meet international fire resistance standards by using heat reflecting coatings with emissivity of 0.07 or less on heat strengthened glass sheets, reducing manufacturing costs while maintaining fire resistance and crack resistance.
Implementation Method 1
Most of heat rays emitted from the flame or the like that is positioned on the side of the heat reflecting coating of the glass sheet are reflected back to the side of the flame by the heat reflecting coating
Implementation Method 2
forming a heat reflecting coating with a low emissivity on at least one surface of a glass sheet
Data Source
AI summary
A single glass panel for a fire door and a double glazed glass panel for a fire door that have a fireproofness with which the glass sheet passes an international standard ISO 0834 flame insulating performance test and are as inexpensive as possible. For example, the single glass panel for a fire door is obtained by forming a heat reflecting coating with a low emissivity on at least one surface of a glass sheet that is a heat strengthened glass sheet or is more thermally strengthened than a heat strengthened glass sheet, and the double glazed glass panel for a fire door includes a first glass sheet (2B) obtained by forming a heat reflecting coating (4) with an emissivity of 0.07 or less on at least one surface of a glass sheet that is a heat strengthened glass sheet or is more thermally strengthened than a heat strengthened glass sheet and a second glass sheet (2C) that is a heat strengthened glass sheet or is a glass sheet more thermally strengthened than a heat strengthened glass sheet, the first glass sheet (2B) and the second glass sheet (2C) being arranged to face each other with a gap therebetween such that at least one layer of said heat reflecting coating (4) is placed between the two glass sheets (2B) and (2C).