Tissue Paper Softener Composition for Strength-Softness Balance
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Solution Overview
Problem
Existing tissue paper faces a limit in improving softness due to the trade-off between softness and tensile strength, where increasing softener amounts leads to poor drying and creping, while reducing tensile strength makes the paper prone to tearing.
Innovation Solution
Tissue paper with a dry tensile strength of 250 cN/25 mm or greater and 400 cN/25 mm or less, a tensile elasticity of 7 N/mm2 or higher and 15 N/mm2 or lower, and a hand-feel value HF of 80 or higher, using a softener with a diethyl ether-extractable oil content of 0.1% by mass or greater and 1.5% by mass or less.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the amount of softener is increased to improve softness, then the softness of the tissue paper is improved, but the paper fails to stick to the dryer during drying and becomes difficult to crepe
Solution Approach 1:
The patent changes the chemical composition parameters of the softener by specifying a particular ratio of cationic polymer to fatty acid amide (0.5:99.5 to 45:55 by mass). This parameter optimization allows the softener to provide softness while maintaining adequate adhesion to the dryer, resolving the contradiction between softness improvement and drying/creping performance.
Solution Approach 2:
The patent uses a composite softener system combining cationic polymer and fatty acid amide in specific ratios. This composite approach creates a synergistic effect where the cationic polymer provides softness and the fatty acid amide enhances adhesion to the dryer, allowing both softness improvement and reliable drying/creping.
2Ease of operation
If the tensile strength is reduced to make the paper softer, then the softness of the tissue paper is improved, but the paper becomes more likely to be torn
Solution Approach 1:
The patent optimizes the softener composition parameters (specific ratios of cationic polymer to fatty acid amide) to achieve a balance where the paper maintains sufficient tensile strength (200-500 cN/25mm) while attaining the desired softness. The controlled softener formulation allows softness improvement without excessive tensile strength reduction.
Data Source
AI summary
Tissue paper containing a softener and having a dry tensile strength of 250 cN/25 mm or greater and 400 cN/25 mm or less in a longitudinal direction, a tensile elasticity of 7 N/mm2 or higher and 15 N/mm2 or lower, and a hand-feel value HF of 80 or higher, where the hand-feel value is measured using a softness analyzer (TSA), is provided.