Two-Ply Moisturizing Tissue Paper Balancing Softness and Durability
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Solution Overview
Problem
Moisturizing tissues face challenges in achieving excellent sensory performance, particularly in terms of softness and durability, while maintaining strength equivalent to non-moisturizing tissues, and often suffer from low durability and nasal mucus adherence issues during use.
Innovation Solution
A two-ply tissue paper with a polyol-containing moisturizer, featuring specific tensile strength, elongation percentage, surface roughness, and friction coefficient values, optimized with needle and leaf bleached kraft pulp fibers and enhanced with dry and wet paper strength enhancers, to balance dry and wet tensile strengths and surface properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If moisture content is increased by adding a moisturizer to provide softness, then softness is improved, but durability and strength are lowered
Solution Approach 1:
The patent applies parameter changes by precisely controlling the moisture content within 8-15% and polyol content within 18-30%, rather than simply increasing moisture. This optimized parameter range maintains softness while preventing excessive moisture that would compromise durability. The patent also controls basis weight (16.0-25.0 g/m²) and physical properties (elongation 8-15%, friction coefficient 0.35-0.55) to achieve the balance between softness and strength.
2Strength
If moisture content is increased to improve softness, then softness is improved, but the tissue breaks more frequently during pop-up operation
Solution Approach 1:
The patent applies parameter changes by precisely controlling the moisture content within 8-15% and polyol content within 18-30%, rather than simply increasing moisture. This optimized parameter range maintains softness while preventing excessive moisture that would compromise durability. The patent also controls basis weight (16.0-25.0 g/m²) and physical properties (elongation 8-15%, friction coefficient 0.35-0.55) to achieve the balance between softness and strength.
3Strength
If moisture content is increased to provide softness, then softness is improved, but nasal mucus adheres to the finger holding the tissue
Solution Approach 1:
The patent applies parameter changes by precisely controlling the moisture content within 8-15% and polyol content within 18-30%, rather than simply increasing moisture. This optimized parameter range maintains softness while preventing excessive moisture that would compromise durability. The patent also controls basis weight (16.0-25.0 g/m²) and physical properties (elongation 8-15%, friction coefficient 0.35-0.55) to achieve the balance between softness and strength.
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
The tissue paper achieves excellent sensory performance with improved softness, durability, and smoothness, matching the strength of non-moisturizing tissues, and provides enhanced comfort and effectiveness in makeup removal and nasal use.
Implementation Method 1
has a moisture content increased by a hygroscopic action of the moisturizer
Data Source
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AI summary
To provide a moisturizing type tissue paper having excellent softness, smoothness, and strength. The problem is solved by a two-ply tissue paper containing a polyol-containing moisturizer. The two-ply tissue paper has a basis weight of 16.0 to 25.0 g/m2 per ply, a two-ply paper thickness of 145 to 180 µm, a dry tensile strength of 120 to 200 cN/25 mm in a lateral direction, a dry tensile strength of 275 to 450 cN/25 mm in a longitudinal direction, a wet tensile strength of 60 to 130 cN/25 mm in the lateral direction, a difference of 40 cN/25 mm or more between the dry tensile strength in the lateral direction and the wet tensile strength in the lateral direction and a value of (wet tensile strength in lateral direction)/(dry tensile strength in lateral direction) of 0.60 to 0.75, and an elongation percentage of 13.0 to 18.0% in the longitudinal direction.