Fiber Web Multi-Coating Transfer for Incompatible Polymers
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Solution Overview
Problem
Existing methods for applying multiple polymeric coatings onto fibrous substrates face challenges due to chemical or physical incompatibilities between materials, limiting the ability to combine beneficial properties and requiring multiple steps, which can lead to inconsistent bonding and processing issues.
Innovation Solution
A hybrid coating technique combining pan-fed reverse roll coating and dip and squeeze methods, where a fibrous substrate pre-coated with one polymeric material is contacted with a support coated with another, allowing for the transfer of the second polymeric material onto the first, enabling the application of chemically or physically incompatible materials in a single process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple polymeric coatings are applied using conventional techniques, then the ability to combine different material properties is limited, but the process complexity increases due to multiple steps and incompatibility issues
Solution Approach 1:
The coating process is segmented into distinct stages: first applying a compatible polymeric material that adheres well to the fibrous substrate, then applying a second polymeric material that may be incompatible with the substrate but is compatible with or can be bonded to the first coating layer. This segmentation allows each layer to be optimized independently for its specific function while avoiding direct incompatibility issues between the substrate and the second material.
Solution Approach 2:
The first polymeric coating layer acts as an intermediary between the fibrous substrate and the second polymeric coating. This intermediate layer mediates the interaction between potentially incompatible materials, allowing the second material to be applied without direct contact with the substrate, thereby enabling combination of material properties that would otherwise be incompatible.
2Adaptability or versatility
If multiple coating steps are used to apply different polymeric materials, then material property combination is enhanced, but manufacturing time and processing steps increase
Solution Approach 1:
The first polymeric coating is applied in advance as a preparatory step that creates a compatible surface for the second coating. This preliminary action establishes the foundation that enables subsequent coating application without requiring additional intermediate processing steps, thereby reducing overall manufacturing time while still achieving multiple material property combinations.
Solution Approach 2:
The coating process maintains continuity by applying the second polymeric material directly onto the first coating layer without interruption or removal of the first layer. This continuous application process eliminates idle time between steps and maintains productive action throughout the multi-coating sequence.
3Ease of manufacture
If conventional coating techniques are used for multiple coatings, then material application is possible, but bonding consistency and processing reliability deteriorate due to incompatibility
Solution Approach 1:
Each coating layer is designed with specific local qualities: the first layer has properties optimized for adhesion to the fibrous substrate, while the second layer has properties optimized for its specific functional requirements. This local quality differentiation ensures that each interface (substrate-coating1 and coating1-coating2) has the appropriate bonding characteristics, thereby maintaining reliability throughout the multi-layer structure.
Solution Approach 2:
The invention changes the bonding parameters at different interfaces: the first coating layer uses parameters optimized for substrate adhesion, while the second coating layer uses parameters optimized for bonding to the first layer. By adjusting these parameters independently at each interface, the system achieves consistent bonding reliability even when dealing with potentially incompatible materials.
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
This method allows for the effective application of multiple polymeric layers onto fibrous substrates, enhancing the combination of beneficial properties and improving the consistency and integrity of the coated fibrous composites, overcoming the limitations of individual coating techniques.
Implementation Method 1
a first polymeric material is applied onto a surface of the fibrous substrate
Implementation Method 2
joining the fibrous substrate and the support by contacting the first polymeric material with the second polymeric material
Data Source
AI summary
A method for applying multiple polymeric coatings onto a fibrous substrate. More particularly, a method for applying multiple polymeric coatings onto fibrous substrates without regard to chemical or physical incompatibilities of the polymeric coating materials. A first polymeric material is applied onto at least one fibrous substrate, and a second polymeric material is applied onto a support. The fibrous substrate and support are joined, contacting the first polymeric material with the second polymeric material, followed by separating the support from the fibrous substrate, such that at least a portion of the second polymeric material remains on the first polymeric material on the fibrous substrate.