Creped Tissue Web Design for Low Surface Roughness and High Bulk
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Solution Overview
Problem
Creped through-dried tissue sheets face challenges in achieving high bulk and softness while maintaining roll firmness, as they tend to lose bulk during winding and have limited flexibility and surface smoothness.
Innovation Solution
The use of high-topography papermaking fabrics and registered creping techniques to produce creped tissue webs with low surface roughness and high bulk, resulting in smooth and firm rolled tissue products with improved bulk and firmness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If creped tissue sheets are produced through conventional methods, then softness is achieved, but bulk is lost during calendaring and winding
Solution Approach 1:
The patent applies parameter changes by modifying the tissue sheet properties through controlled calendaring pressure and moisture content, and by adjusting the creping process parameters (creping blade angle, Yankee dryer speed, tissue web tension) to achieve optimal bulk retention while maintaining softness
Solution Approach 2:
The patent implements preliminary action by pre-conditioning the tissue web before creping through specific drying conditions and web preparation techniques, ensuring the tissue is properly prepared to maintain bulk during subsequent winding operations
2Strength
If basis weight of tissue sheet is increased to improve softness, then thickness increases, but achieving high sheet bulk becomes more challenging
Solution Approach 1:
The patent changes physical parameters including basis weight, moisture content, and caliper measurements to achieve the desired balance between softness and bulk, using controlled variations in these parameters during the manufacturing process
3Volume of moving object
If tissue roll is wound loosely to increase roll bulk, then roll bulk increases, but firmness decreases
Solution Approach 1:
The patent applies preliminary anti-action by pre-compressing the tissue web during the creping and winding process to counteract the tendency of the tissue to expand and lose firmness, ensuring the final roll maintains both bulk and firmness
Solution Approach 2:
The patent modifies winding parameters including wrap tension, winding speed, and roll density to achieve the optimal balance between roll bulk and firmness, using controlled parameter changes during the winding operation
4Strength
If creped tissue sheet surface roughness is reduced to improve smoothness, then softness perception increases, but bulk may be compromised
Solution Approach 1:
The patent applies parameter changes by controlling the calendaring pressure, temperature, and duration to achieve the desired surface smoothness while minimizing bulk loss, using precise parameter optimization
Data Source
AI summary
The present disclosure relates to creped tissue webs that demonstrate low surface-roughness and high sheet bulk. The present disclosure relates to a creped, single ply tissue web having a single wire probe mean deviation of MIU (MMD) of less than about 0.040 and a sheet bulk of greater than about 12 cc/g. The present disclosure also relates to a creped, multi-ply tissue web having a single wire probe mean deviation of MUI (MMD) of less than about 0.035 and a sheet bulk of greater than about 10 cc/g.