Hybrid Fiber Web Coating for Incompatible Polymeric Layers
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Solution Overview
Problem
Conventional 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 polymeric material, allowing for the transfer of the second 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 conventional coating techniques (pan-fed reverse roll coating or dip and squeeze) are used to apply multiple polymeric coatings, then coating application is achieved, but chemical or physical incompatibilities between materials limit the ability to combine beneficial properties and require multiple steps
Solution Approach 1:
The patent combines pan-fed reverse roll coating and dip and squeeze techniques into a hybrid single-step process. The support is pre-coated with first polymeric material using pan-fed reverse roll coating, then the fibrous web is dipped into second polymeric material and squeezed, achieving multiple coatings in one continuous operation without intermediate steps
Solution Approach 2:
The support acts as an intermediary carrier that is pre-coated with the first polymeric material. This support facilitates the transfer and bonding of incompatible polymeric materials by providing a stable base that allows subsequent coating of the second material without direct chemical interaction during application
2Reliability
If multiple coating steps are used to apply incompatible polymeric materials, then material compatibility issues are addressed, but processing time and number of operations increase
Solution Approach 1:
The support is pre-coated with the first polymeric material before the fibrous web is processed. This preliminary coating action ensures that the first material is already in place and properly positioned, allowing the second material to be applied directly without requiring separate coating operations
Solution Approach 2:
Multiple coating operations are merged into a single continuous process where the fibrous web receives both polymeric coatings in one pass through the coating apparatus, eliminating the need for separate coating steps and intermediate handling
3Shape
If dip and squeeze technique is used to apply liquid binder material, then yarn spreading is enhanced, but fluctuations in viscosity, line speed, and nip pressure cause substantial variations in liquid pickup
Solution Approach 1:
The support serves as an intermediary that controls liquid transfer. By pre-coating the support with a controlled amount of first polymeric material, the system buffers against fluctuations in viscosity, line speed, and nip pressure, ensuring more consistent liquid pickup on the fibrous web
Solution Approach 2:
The support is pre-coated with the first polymeric material under controlled conditions before contact with the fibrous web. This preliminary action establishes a consistent baseline coating that reduces the impact of subsequent process variations during the dip and squeeze operation
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 enables the efficient application of multiple polymeric layers onto fibrous substrates, enhancing the combination of beneficial properties and improving the consistency and integrity of the coated fibrous web, overcoming the limitations of individual coating techniques by facilitating the adhesion of dissimilar polymer materials.
Implementation Method 1
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.