Single-Piece Mineral Wool Door Panel with Acoustic Cavities

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Solution Overview

Problem

Existing mineral wool insulation panels in fire-rated doors lack a balanced combination of fire resistance and acoustic attenuation while often requiring multiple panels that complicate handling and increase the risk of thermal bridges.

Innovation Solution

A single piece mineral wool insulation panel with integrated acoustic cavities is used between structural plates, enhancing fire resistance and acoustic attenuation, and is designed to fit seamlessly within a door cavity without the need for additional panels, thereby improving handling and reducing thermal bridges.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If homogeneous mineral wool insulation panels are used to achieve fire resistance, then fire resistance is improved, but acoustic attenuation deteriorates

Engineering Contradiction:

Improvefire resistanceVSAvoidacoustic attenuation

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The homogeneous mineral wool insulation panel is segmented into multiple layers with different densities and acoustic cavity structures. This segmentation allows each layer to specialize in either fire resistance or acoustic attenuation, resolving the contradiction by enabling both functions to coexist in different portions of the overall insulation system.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Different regions of the insulation panel are given different properties: some layers have higher density and fire-resistant characteristics while other layers incorporate acoustic cavities for sound attenuation. This local differentiation allows the panel to simultaneously achieve fire resistance in certain zones and acoustic attenuation in others, resolving the contradiction between these two opposing requirements.

Inventive Principle:

Principle #3Local quality

2Object-affected harmful factors

If multiple insulation panels are used to improve acoustic attenuation, then acoustic attenuation is improved, but device complexity increases

Engineering Contradiction:

Improveacoustic attenuationVSAvoidpanel assembly complexity

Core Design Contradiction:

Object-affected harmful factorsVSDevice complexity

Solution Approach 1:

Multiple functional layers that would traditionally require separate panels are merged into a single integrated insulation panel. The panel combines fire-resistant mineral wool layers with acoustic cavity layers in one unified structure, eliminating the need for multiple separate panels and reducing assembly complexity while maintaining acoustic attenuation performance.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The single insulation panel is designed to perform multiple functions simultaneously: fire resistance, acoustic attenuation, and thermal insulation. By making the panel universal and multi-functional, there is no need to install separate panels for each function, thereby reducing device complexity while achieving the desired acoustic attenuation.

Inventive Principle:

Principle #6Universality (Multi-functionality)

3Manufacturing precision

If multiple insulation panels are used to fill cavity gaps, then complete coverage is improved, but ease of operation deteriorates

Engineering Contradiction:

Improvecavity coverageVSAvoidhandling

Core Design Contradiction:

Manufacturing precisionVSEase of operation

Solution Approach 1:

Multiple smaller insulation panels are merged into a single large-format insulation panel that can cover the entire door cavity in one piece. This eliminates the need to handle, position, and join multiple separate panels, significantly improving ease of operation and handling while maintaining complete cavity coverage.

Inventive Principle:

Principle #5Merging (Combining)

4Reliability

If additional elements are added to insulation panels to improve fire resistance, then fire resistance is improved, but manufacturing precision deteriorates

Engineering Contradiction:

Improvefire resistanceVSAvoidpanel homogeneity

Core Design Contradiction:

ReliabilityVSManufacturing precision

Solution Approach 1:

Instead of adding discrete elements throughout the entire panel, fire-resistant properties are concentrated in specific layers with controlled density variations. The acoustic cavities are systematically arranged in specific patterns rather than randomly distributed, maintaining manufacturing precision while achieving enhanced fire resistance through localized material property optimization.

Inventive Principle:

Principle #3Local quality

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 achieves improved fire resistance and acoustic attenuation with a lower mass panel, offering better sound reduction performance by 2-5 dB compared to homogeneous panels, while facilitating easier handling and assembly.

Implementation Method 1

acoustic attenuation, offering better sound reduction performance by 2-5 dB compared to homogeneous panels

Methodology Applied

Scientific EffectAcoustic absorption: Acoustic Absorption

Implementation Method 2

fire resistance, achieving improved fire resistance

Methodology Applied

Scientific EffectThermal insulation: Thermal Insulation

Data Source

PatentEP3412858B2Building structure with a mineral wool insulation panel and method ofmanufacturing the same

Publication Date: 2025.07.30 KNAUF INSULATION SPRL

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AI summary

A single piece mineral wool insulation panel, notably for a fire rated door, is provided with a plurality of acoustic cavities positioned between its first and second major surfaces.