Air and Water Barrier Roll Coatings for Easier Liner Removal
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Solution Overview
Problem
The removal of the release liner from a roll of air and water barrier sheeting can be difficult, especially when it is designed to be water vapor permeable, and can affect lap adhesion in some cases.
Innovation Solution
A combination of coating compositions on the air and water barrier sheet and the release liner is used, where the first coating has a lower peel adhesion to the liner than the second coating, allowing the liner to release from the pressure-sensitive adhesive and remain adhered to the second coating after application, facilitating easy removal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If the release liner is designed to be water vapor permeable to allow moisture transmission, then moisture vapor can pass through the barrier sheet, but the liner becomes difficult to remove from the pressure-sensitive adhesive
Solution Approach 1:
The patent applies different coating compositions with different peel adhesion properties to different regions of the liner. The first coating composition has lower peel adhesion to facilitate removal, while the second coating composition has higher peel adhesion to maintain attachment. This local differentiation of adhesive properties resolves the contradiction between allowing vapor transmission and enabling easy removal.
Solution Approach 2:
The liner is divided into different functional zones through the application of multiple coating compositions. The first coating composition creates a removable region, while the second coating composition creates a permanent attachment region. This segmentation allows the liner to simultaneously achieve vapor permeability and controlled removability in different areas.
2Object-generated harmful factors
If the liner is completely removed from the pressure-sensitive adhesive to improve water vapor permeability, then vapor transmission is enhanced, but lap adhesion is compromised
Solution Approach 1:
The patent maintains lap adhesion in critical regions by applying the second coating composition with higher peel adhesion to specific areas of the liner. This ensures that while the liner can be partially removed for vapor transmission, the lap joints maintain sufficient adhesion for structural integrity.
Solution Approach 2:
The second coating composition acts as an intermediary layer that mediates between the liner and the pressure-sensitive adhesive in lap joint regions. This intermediate coating ensures reliable adhesion in critical areas while allowing removal in non-critical areas for vapor transmission.
3Device complexity
If a single coating composition is used between the liner and pressure-sensitive adhesive, then the structure is simpler, but the liner cannot be easily removed while maintaining adhesion
Solution Approach 1:
Instead of using a single uniform coating, the patent segments the coating into multiple compositions with different peel adhesion properties. This segmentation enables differentiated functionality - easy removal in some areas and strong adhesion in others - resolving the contradiction between simplicity and operational ease.
Solution Approach 2:
The patent changes the peel adhesion parameter across different regions of the liner by using coating compositions with different adhesive properties. This parameter differentiation allows the liner to exhibit both easy removability and strong adhesion in different locations, overcoming the limitations of a single coating composition.
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 method enables easy and efficient application of the air and water barrier sheet by allowing the liner to remain adhered to the second coating composition, improving lap adhesion and simplifying the application process.
Implementation Method 1
The first coating composition has lower peel adhesion to the first major surface of the liner than the second coating composition has to the first major surface of the liner
Data Source
AI summary
The roll includes an air and water barrier article, a pressure sensitive adhesive disposed on the first major surface of the barrier article, first and second coating compositions disposed on the opposing second major surface of the barrier article, and a liner having a first major surface in contact with the first coating composition and the second coating composition. The first coating composition has a first peel adhesion to the first major surface of the liner that is lower than a second peel adhesion of the second coating composition to the first major surface of the liner. The pressure sensitive adhesive contacts a second major surface of the liner when wound in the roll, and a peel adhesion between the second major surface of the liner and the pressure sensitive adhesive is less than or equal to the second peel adhesion. There are also provided methods of applying barrier articles, films made using these barrier articles, and building envelopes made using such films.