Vapor-Permeable Membrane With Spaced Adhesive Lines
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Solution Overview
Problem
Existing barrier membranes for buildings face issues with mechanical fasteners causing punctures and poor contact, while liquid adhesives reduce permeability, and self-adhesive membranes have limited permeability under adhesive coverage.
Innovation Solution
A self-adhesive vapor permeable membrane with spaced adhesive lines on a porous sheet layer, allowing for continuous application and improved adherence, using a slot die extrusion process to form parallel adhesive lines, ensuring high permeability and robust attachment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If mechanical fasteners (staples) are used to attach the barrier membrane, then the membrane can be securely attached to the structure, but the fasteners form punctures in the membrane and provide poor contact between the membrane and building structure
Solution Approach 1:
The patent replaces mechanical fasteners (staples) with a chemical bonding system using pressure-sensitive adhesive. The adhesive lines are applied to the back surface of the membrane, creating a chemical bond with the building structure that eliminates punctures and ensures continuous contact without mechanical penetration of the membrane material.
Solution Approach 2:
The patent introduces adhesive lines as an intermediary substance between the membrane and the building structure. This adhesive layer acts as a mediator that bonds the two surfaces together chemically, providing secure attachment while maintaining the integrity and continuity of the membrane without direct mechanical contact or punctures.
2Strength
If liquid adhesives are used to attach the barrier membrane, then the membrane can be adhered to the structure, but the permeability of the membrane is significantly reduced
Solution Approach 1:
The patent divides the adhesive application into discrete, spaced lines rather than a continuous layer. The adhesive lines are positioned at specific intervals across the membrane width, creating isolated adhesive bonds that secure the membrane while leaving large portions of the membrane surface uncovered and fully permeable to water vapor transmission.
Solution Approach 2:
The patent applies adhesive only in specific localized areas (spaced lines) rather than uniformly across the entire membrane surface. This creates different functional zones: adhesive lines provide attachment strength where needed, while the spaces between lines maintain full vapor permeability, optimizing both adhesion and moisture transmission properties in different locations.
3Strength
If self-adhesive membranes with continuous adhesive coverage are used, then the membrane adheres well to the structure, but the permeability is limited in areas covered by adhesive
Solution Approach 1:
The patent divides the adhesive application into discrete, spaced lines rather than a continuous layer. The adhesive lines are positioned at specific intervals across the membrane width, creating isolated adhesive bonds that secure the membrane while leaving large portions of the membrane surface uncovered and fully permeable to water vapor transmission.
Solution Approach 2:
The patent applies adhesive in a partial manner rather than complete coverage. By using spaced adhesive lines that cover only a portion of the membrane surface, the patent achieves sufficient adhesion strength for secure attachment while deliberately leaving areas uncovered to maintain optimal vapor permeability, avoiding the excessive adhesive coverage that would compromise moisture transmission.
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 membrane maintains high vapor permeability and secure attachment to structural surfaces, even on irregular surfaces, with improved resistance to debonding, especially in windy conditions, and can be applied in a wide temperature range without a primer.
Implementation Method 1
A plurality of spaced adhesive lines are applied to one surface of the membrane for use in adhering the membrane to a structural surface
Implementation Method 2
The membrane is permeable to the passage of water vapor... designed to control the flow of moisture in and out of the building
Data Source
AI summary
A self-adhesive vapor permeable membrane having a porous sheet layer. Formed onto one surface of the porous sheet layer are a plurality of individual adhesive lines. The individual adhesive lines are spaced across the width of the porous sheet layer and extent along the length of the porous sheet layer. Portions of the porous sheet layer between the individual adhesive lines remain free of adhesive.