Single-Ply Tissue Roll Bulk and Firmness Through Fabric Topography
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Manufacturers face challenges in producing rolled tissue products with high bulk and firmness while maintaining acceptable cost, as increasing basis weight reduces roll bulk and achieving high roll bulk compromises sheet firmness and absorbency.
Innovation Solution
The use of high topography fabrics in both transfer and through-air drying positions during the production of single-ply tissue webs, resulting in improved sheet and roll bulk, reduced stiffness, and enhanced roll firmness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the basis weight of tissue sheets is increased to provide greater absorbency and hand protection, then sheet quality improves, but roll bulk decreases since fewer wraps fit at the same roll weight
Solution Approach 1:
The patent changes the physical parameters of the tissue sheet by controlling basis weight within a specific range (20-40 gsm) and sheet bulk (>12 cc/g) to optimize the balance between sheet quality and roll bulk, resolving the contradiction between these two parameters
2Strength
If tissue sheets are made with sufficient basis weight and good firmness, then sheet quality improves, but achieving high roll bulk becomes more challenging
Solution Approach 1:
The patent optimizes multiple parameters simultaneously including basis weight (20-40 gsm), sheet bulk (>12 cc/g), and roll bulk (>10 cc/g) to achieve a balanced solution that satisfies both sheet firmness and roll bulk requirements
Solution Approach 2:
The patent uses a composite fiber furnish comprising hardwood fibers, softwood fibers, and nonwoody fibers in specific proportions to achieve the desired combination of sheet firmness, bulk, and absorbency properties
3Volume of moving object
If rolled tissue products are made with large diameter to convey sufficient material, then consumer value improves, but roll firmness decreases making rolls easily deformed
Solution Approach 1:
The patent optimizes roll bulk (>10 cc/g) and sheet bulk (>12 cc/g) parameters to enable large diameter rolls to maintain adequate firmness and resistance to deformation
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 approach enables the production of single-ply tissue rolls with increased bulk and firmness, maintaining sheet softness and strength, thereby addressing the contradictory parameters of large diameter, good firmness, and cost-effectiveness.
Implementation Method 1
through-air drying process utilizing high topography papermaking fabrics for both the transfer and through-drying fabrics
Data Source
AI summary
Spirally wound paper products are disclosed having desirable roll bulk, firmness and softness properties. The rolled products can be made from single ply tissue webs formed according to various processes.