Wrappable Laminated Textile Sleeve for Foil Crack Resistance
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Solution Overview
Problem
Textile sleeves with reflective foil layers used for protecting elongate members from high heat often suffer from cracking, particularly at the closure tape region, reducing their useful life and appearance.
Innovation Solution
A wrappable textile sleeve design featuring a polymeric film layer with a thinner thickness than a bonded metal foil layer, along with a woven textile layer and closure tape with a woven scrim and metal foil, where the metal foil layer is made of soft aluminum and the polymeric film is preshrunk polyethylene terephthalate, to prevent cracking and enhance flexibility and hoop strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a foil layer is applied to protect against high heat, then thermal protection is improved, but the foil layer becomes prone to cracking under high heat exposure
Solution Approach 1:
The patent applies a composite material structure consisting of a textile layer, polymeric film layer, and metal foil layer bonded together. This composite structure combines the thermal reflection properties of the foil with the flexibility and crack resistance of the polymeric film and textile layers, resolving the contradiction between thermal protection and crack resistance under high heat exposure.
Solution Approach 2:
The patent specifies precise thickness parameters for each layer: the polymeric film layer is 0.0001-0.0004 inches thick and the metal foil layer is 0.00035-0.0010 inches thick. By optimizing these dimensional parameters, the patent achieves the right balance between flexibility (preventing cracks) and thermal protection (foil functionality) under high temperature conditions.
2Ease of operation
If the polymeric film layer is made thinner to improve flexibility, then flexibility is improved, but the layer becomes less effective at preventing foil cracking
Solution Approach 1:
The patent optimizes the thickness parameter of the polymeric film layer to a specific range (0.0001-0.0004 inches) that provides sufficient flexibility for wrapping and conforming while maintaining enough structural integrity to prevent foil cracking. This precise parameter control resolves the contradiction between flexibility and crack prevention.
Solution Approach 2:
The composite structure combines the polymeric film with the metal foil layer and textile layer, where each material compensates for the weaknesses of the others. The polymeric film provides flexibility, while the foil provides thermal protection, and together they create a system where the thinner film still effectively prevents cracking due to the synergistic composite action.
3Temperature
If the metal foil layer is made thicker to improve thermal protection, then thermal protection is improved, but the overall structure becomes less flexible
Solution Approach 1:
The patent specifies the metal foil layer thickness within the range of 0.00035-0.0010 inches, optimizing this parameter to provide sufficient thermal protection while maintaining flexibility. By controlling the foil thickness parameter within this specific range, the patent resolves the contradiction between thermal protection and flexibility.
Solution Approach 2:
The composite material system allows the metal foil layer to be relatively thin (0.00035-0.0010 inches) while still providing effective thermal protection because the polymeric film and textile layers contribute to the overall thermal performance. The composite action enables reduced foil thickness without sacrificing thermal protection, thereby maintaining flexibility.
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 design significantly reduces cracking and extends the useful life of the sleeve by maintaining flexibility and hoop strength, even under high-temperature conditions, while maintaining a smooth arc and preventing kinking.
Implementation Method 1
The polymer film layer and the metal foil layer are bonded together by an adhesive
Implementation Method 2
The polymer film is a preshrunk polymer film
Data Source
AI summary
A wrappable textile sleeve and method of reducing cracking in a foil layer of a wrappable textile sleeve are provided. The sleeve includes an elongate wall extending along a longitudinal axis between opposite ends with lengthwise extending edges extending along the longitudinal axis between the opposite ends. The wall includes a textile layer, a polymeric film layer fixed to the inner textile layer and a metal foil layer fixed to the polymeric film layer. The polymeric film layer has a first thickness and the metal foil layer has a second thickness, wherein the second thickness is greater than the first thickness.