Hesperaloe Fiber Tissue Products for Softness and Durability Balance
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Solution Overview
Problem
The challenge in manufacturing tissue products is to balance softness and durability while maintaining bulk, as conventional wood fibers like Northern Softwood Kraft (NSWK) are under economic and environmental pressure, and alternatives such as Southern Softwood Kraft (SSWK) result in stiffer, harsher products.
Innovation Solution
The use of hesperaloe fibers, processed through high yield pulping, replaces at least 50% of NSWK fibers, maintaining or improving tissue product strength, stiffness, and bulk, and when blended with NSWK or SSWK fibers, enhances softness and durability without increasing stiffness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional wood fibers like NSWK are used to achieve softness and durability, then product softness and strength are improved, but production costs increase and environmental sustainability deteriorates
Solution Approach 1:
The patent changes the fiber source parameter from conventional wood fibers (NSWK) to alternative non-wood fibers (hesperaloe, bamboo, wheat straw) while maintaining the functional parameters of softness and strength. This substitution resolves the contradiction by providing cost-effective and environmentally sustainable alternatives that meet performance requirements
Solution Approach 2:
The patent creates composite fiber blends combining alternative fibers with conventional wood fibers or other alternative fibers. This composite approach allows optimization of both cost and performance, achieving the desired balance between softness, strength, and manufacturing economy
2Ease of manufacture
If SSWK fibers are used as alternative to NSWK, then production costs are reduced, but product softness deteriorates due to increased stiffness
Solution Approach 1:
The patent applies local quality by selecting specific alternative fibers (hesperaloe, bamboo, wheat straw) that possess locally optimal properties - these fibers provide both cost efficiency and maintained softness, unlike SSWK which fails the softness criterion. The selection is based on specific fiber characteristics such as lumen diameter, cell wall thickness, and fiber length
Solution Approach 2:
The patent uses composite fiber blends combining alternative fibers with conventional wood fibers or other alternative fibers in specific ratios. This composite approach allows optimization of both cost and softness, achieving the desired balance that SSWK alone cannot provide
3Strength
If fiber length is reduced to improve softness, then surface softness is improved, but product durability deteriorates
Solution Approach 1:
The patent changes the fiber morphology parameters by selecting alternative fibers that naturally possess optimal length-to-coarseness ratios. These fibers provide softness without sacrificing durability because their inherent structure (length, lumen diameter, cell wall thickness) creates effective hydrogen bonding networks that maintain strength
Data Source
AI summary
The present invention provides soft, durable and bulky tissue products comprising non-wood fibers and more particularly hesperaloe fiber. The inventors have discovered that high yield hesperaloe pulp fiber, when incorporated in amounts of at least about 5 percent by weight of the tissue product, produces products having a GMT less than about 1000 g/3″ and a GM Slope less than about 7.0 kg. At the foregoing tensile strengths and modulus the tissue products of the present invention are also generally soft, such as having a Stiffness Index less than about 10.0, and more preferably less than about 9.0, such as from about 7.0 to about 9.0.