Multilayer Polyethylene Insulation Jacket Flame Resistance
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Solution Overview
Problem
Existing insulation facings for building components face challenges with mold resistance, mechanical durability, and fire resistance, particularly due to the use of paper layers that are prone to mold growth and require adhesive laminating processes.
Innovation Solution
A fire retardant insulation jacket composed of multiple polymeric layers, including an inner and outer layer of low-density polyethylene and a high-density polyethylene intermediate layer, attached using heat and pressure without adhesives, providing improved flame retardancy and mechanical properties while maintaining a patterned appearance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If paper facing is used for insulation material, then cost is reduced and ease of manufacture is improved, but mold resistance deteriorates and mechanical durability worsens
Solution Approach 1:
The patent uses a composite structure with a polymeric outer layer bonded to a paper inner layer. The polymeric layer provides mold resistance and durability while the paper layer provides cost-effectiveness and ease of manufacture. This composite material approach resolves the contradiction by combining materials with complementary properties.
2Strength
If tri-directional scrim is added to reinforce paper facing, then mechanical properties such as tensile strength and tear resistance are improved, but device complexity and manufacturing complexity increase
Solution Approach 1:
The patent replaces the complex tri-directional scrim reinforcement with a simpler polymeric outer layer that provides both structural reinforcement and mold resistance. This polymeric layer acts as a protective facing that inherently provides the necessary mechanical strength without requiring additional scrim layers or complex bonding structures.
3Reliability
If polymeric material layer is added to protect paper from mold, then mold resistance is improved, but device complexity and number of layers increase
Solution Approach 1:
The patent employs a two-layer composite structure where a polymeric outer layer is bonded to a paper inner layer. This straightforward composite design provides mold resistance through the polymeric layer while maintaining simplicity in the overall structure, avoiding the need for multiple intermediate layers or complex configurations.
4Strength
If adhesive layers are used to bond facing to insulation material, then bonding strength is improved, but fire resistance deteriorates due to additional combustible material
Solution Approach 1:
The patent eliminates traditional adhesive layers in favor of a polymeric outer layer that is inherently bonded to the paper substrate. This approach removes the separate adhesive component that would add fire risk, while the polymeric layer itself provides both structural bonding and fire-resistant properties when properly formulated.
Solution Approach 2:
The patent uses a composite polymeric-paper structure where the polymeric layer serves dual functions: providing structural bonding to the insulation material and offering fire-resistant properties. This integrated composite approach eliminates the need for separate adhesive layers that would compromise fire resistance.
5Strength
If woven scrim or foil is overlaid on paper facing, then puncture resistance and durability are improved, but manufacturing complexity and cost increase
Solution Approach 1:
The patent employs a composite structure with a polymeric outer layer that inherently provides puncture resistance and durability. This polymeric layer replaces the need for overlaid scrims or foil, simplifying the manufacturing process while maintaining the necessary mechanical protection for the underlying paper and insulation material.
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 superior flame retardancy, mold resistance, and mechanical durability, passing ASTM C1136 standards with reduced char length and improved surface burning characteristics, while eliminating the need for adhesives and woven scrims, thus enhancing installation ease and aesthetic preservation.
Implementation Method 1
The inner layer, intermediate layer and outer layers are configured for attachment to each other with the use of heat, polymeric material, and pressure
Implementation Method 2
The inner layer, intermediate layer and outer layers are configured for attachment to each other with the use of heat, polymeric material, and pressure
Data Source
AI summary
A jacket configured to encase building component insulation is provided. The jacket comprises at least inner layer, an intermediate layer attached to the inner layer, and an outer layer attached to the intermediate layer. The inner layer, intermediate layer and outer layers are configured for attachment to each other with the use at least one of heat, polymeric material, and pressure. Additionally, the jacket complies with the standards of flame retardancy as provided by ASTM C1136.