Stratified Paper Towel Reducing Lint via Softwood Outer Layer
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Solution Overview
Problem
Existing paper towels generate high levels of lint during use, which is undesirable for consumers, and existing strategies to reduce lint often compromise other desirable attributes such as dry strength, wet strength, softness, absorbency, and hand-feel.
Innovation Solution
The development of a paper product with a stratified base sheet structure, where the outer layers are composed of at least 80% softwood fibers with specific length and coarseness characteristics, and a CD wet/dry tensile ratio between 0.025 and 0.035, to reduce lint generation while maintaining consumer-preferred attributes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If conventional paper towel materials and structures are used, then basic absorbency and softness are achieved, but high levels of lint are generated during use
Solution Approach 1:
The patent applies local quality by creating a stratified base sheet with different fiber compositions in different layers. The outer layer uses primarily softwood fibers (80-95%) to reduce lint generation, while the inner layer can have different fiber blends to maintain bond strength. This localized differentiation allows each layer to perform its specific function optimally without compromising the other.
Solution Approach 2:
The patent employs composite materials by combining softwood and hardwood fibers in specific ratios within the outer layer, while using different fiber compositions in the inner layer. This composite approach enables the paper product to simultaneously achieve low lint generation from the softwood-rich outer layer and high fiber bond strength from the strategically designed inner layer structure.
2Object-generated harmful factors
If lint reduction strategies are implemented, then lint generation is reduced, but other attributes such as dry strength, wet strength, softness, absorbency, and hand-feel are compromised
Solution Approach 1:
The patent segments the base sheet into multiple layers with distinct fiber compositions. The outer layer is optimized for lint reduction using softwood fibers, while the inner layer is designed to provide structural support and strength. This segmentation allows each layer to be independently optimized for its primary function without compromising overall product performance.
Solution Approach 2:
The patent applies local quality by creating a stratified base sheet with different fiber compositions in different layers. The outer layer uses primarily softwood fibers (80-95%) to reduce lint generation, while the inner layer can have different fiber blends to maintain bond strength. This localized differentiation allows each layer to perform its specific function optimally without compromising the other.
3Object-generated harmful factors
If lint reduction strategies are implemented, then lint generation is reduced, but softness and hand-feel are compromised
Solution Approach 1:
The patent applies local quality by creating a stratified base sheet with different fiber compositions in different layers. The outer layer uses primarily softwood fibers (80-95%) to reduce lint generation, while the inner layer can have different fiber blends to maintain bond strength. This localized differentiation allows each layer to perform its specific function optimally without compromising the other.
Solution Approach 2:
The patent employs composite materials by combining softwood and hardwood fibers in specific ratios within the outer layer, while using different fiber compositions in the inner layer. This composite approach enables the paper product to simultaneously achieve low lint generation from the softwood-rich outer layer and high fiber bond strength from the strategically designed inner layer structure.
Data Source
AI summary
Multi-ply paper products and methods of making such products includes providing a first furnish including a primary pulp having papermaking fibers with a weight-weighted average fiber length, a coarseness of about sixteen milligrams per one hundred meters or lower, and being at least eighty percent of the papermaking fibers of the first furnish, forming a nascent web having at least two layers, one of the layers being a surface layer of the nascent web and formed from the first furnish, dewatering the nascent web to form a dewatered web, and drying the dewatered web to form a multi-ply paper product. The multi-ply paper product includes a first ply and a second ply arranged such that an inner layer of the first ply is adjacent to an inner layer of the second ply and the inner layer of the first ply is attached to the inner layer of the second ply.