Hesperaloe Fiber Tissue for Cross-Machine Direction Strength
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Solution Overview
Problem
The challenge in producing tissue products is to balance softness and durability, as increasing one property often adversely affects the other, and there is a need for alternatives to Northern softwood kraft fibers due to supply constraints and economic pressures.
Innovation Solution
The use of hesperaloe fibers, processed through high yield pulping methods, to create tissue products with improved softness, strength, and bulk, potentially replacing up to 100% of Northern softwood kraft fibers without compromising strength, stiffness, or bulk.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If fiber length is reduced to increase surface softness, then softness is improved, but durability decreases
Solution Approach 1:
The patent changes the physical and chemical parameters of the fiber material by using hesperaloe fibers with specific properties (length-weighted average fiber length of 1.2-2.5mm, coarseness of 2-10 mg/100m, aspect ratio of 40-100) to achieve both softness and durability simultaneously, rather than relying on conventional wood fibers that require compromising one property for the other
Solution Approach 2:
The patent creates a composite fiber system by blending hesperaloe fibers with hardwood kraft fibers in specific ratios (at least 20% hesperaloe fiber by weight), combining the advantages of both fiber types to achieve improved cross-machine direction properties while maintaining softness and durability
2Productivity
If conventional wood fibers (NSWK) are replaced with alternative fibers, then supply constraints are relieved, but cross-machine direction properties deteriorate
Solution Approach 1:
The patent identifies and utilizes hesperaloe fibers with specific parameter ranges (fiber length 1.2-2.5mm, coarseness 2-10 mg/100m, aspect ratio 40-100) that naturally provide improved cross-machine direction properties, eliminating the need for NSWK while maintaining or enhancing strength
Solution Approach 2:
The patent targets specific performance requirements (cross-machine direction strength, softness, bulk) and selects hesperaloe fiber parameters that locally optimize these properties, particularly the aspect ratio and coarseness that enhance cross-machine direction behavior without compromising other qualities
Data Source
AI summary
Soft, durable and bulky tissue products comprising non-wood fibers and more particularly high yield hesperaloe pulp fibers are disclosed. The tissue products preferably comprise at least about 5 percent, by weight of the product, high yield hesperaloe pulp fiber and have relatively modest tensile strengths, such as a geometric mean tensile (GMT) less than about 1,000 g/3″, and improved durability and cross-machine direction (CD) properties, such as a CD Stretch greater than about 10 percent. Additionally, at the foregoing tensile strengths the products are not overly stiff. For example the tissue products may have a Stiffness Index less than about 10.0.