High-Basis-Weight Creped Tissue With Low Stiffness
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Solution Overview
Problem
Conventional tissue products face a dilemma in achieving high basis weight for softness and absorbency while maintaining low stiffness, as increased basis weight typically results in stiffness and reduced creping performance.
Innovation Solution
The development of multi-ply tissue products with basis weights greater than 20 gsm, featuring altered creping conditions to enhance machine-direction stretch and cross-machine direction stretch, resulting in low stiffness and high absorbency without compromising tensile strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If basis weight is increased to achieve thickness and absorbency, then softness and absorbency are improved, but stiffness increases and creping performance deteriorates
Solution Approach 1:
The patent changes the chemical parameters of the creping composition by incorporating specific polymers (polyvinyl alcohol, carboxymethyl cellulose, hydroxyethyl cellulose) and controlling pH levels (5.5-7.5) to enable effective creping at higher basis weights while maintaining softness and reducing stiffness
Solution Approach 2:
The patent uses composite creping compositions combining multiple polymers and additives work together to achieve the desired balance between basis weight, stiffness, and softness that cannot be achieved with single-component systems
2Quantity of substance
If basis weight is increased to achieve thickness and absorbency, then softness and absorbency are improved, but creping performance deteriorates
Solution Approach 1:
The patent modifies process parameters including pH control (5.5-7.5), polymer concentration (0.1-5%), and creping composition formulation to enable successful creping of high basis weight tissues that would otherwise be difficult to process
Solution Approach 2:
The creping composition acts as an intermediary substance between the tissue web and the creping surface, facilitating the creping process for high basis weight materials by providing controlled adhesion and release properties
Data Source
AI summary
The present invention provides multi-ply creped tissue products, and in particular embodiments creped wet pressed tissue products, having substantially higher per-ply basis weights, such as from about 20 to about 30 gsm, without the negative effects often associated with higher basis weight. As such, the tissue products are generally soft and flexible, having a softness value (measured as TS7) less than about 12.0 and a Stiffness Index less than about 20. While being soft and flexible, the instant tissue products are durable enough to withstand use, such as having a GMT greater than about 600 g/3″ and a Burst Index greater than about 12.0.