Tissue paper
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Solution Overview
Problem
Conventional moisturizing tissue paper struggles to achieve a balance between high levels of 'moistness' and 'smoothness' while maintaining 'toughness' and 'sensation of thickness', often compromising one quality for another due to the limitations of polyhydric alcohol and sugar-based moisturizing agents.
Innovation Solution
A two-ply tissue paper with a basis weight between 12.9 g/m² and 16.8 g/m², a paper thickness of 128 μm to 150 μm, and a chemical agent containing glycerin and 1,3-propanediol in a specific mass ratio of 83.7% or more, applied in an amount of 2.3 g/m² to 6.1 g/m², which enhances both moistness and smoothness while maintaining sufficient dry and wet tensile strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the content of conventional moisturizing agent is increased to enhance moistness, then the moistness is improved, but the stickiness is enhanced at the same time and the smoothness on surface is reduced
Solution Approach 1:
The patent changes the chemical composition parameters of the moisturizing agent by using a specific mixture of polyhydric alcohols (glycerin, propylene glycol, butylene glycol) in defined ratios, rather than simply increasing the content of conventional single agents. This compositional parameter change allows achieving high moistness while controlling stickiness through the synergistic effects of different alcohol types.
Solution Approach 2:
The patent employs a composite moisturizing system combining multiple polyhydric alcohols (glycerin, propylene glycol, butylene glycol) in specific proportions. This composite approach leverages the complementary properties of each component: glycerin for moisture retention, propylene glycol for smoothness and low viscosity, and butylene glycol for additional moisturizing with less stickiness, thereby achieving balanced performance.
2Quantity of substance
If the content of moisturizing agent is increased to improve softness and moistness, then the sensation of smoothness is provided, but the stiffness of paper is reduced making it difficult to provide the sensation of smoothness
Solution Approach 1:
The patent optimizes the concentration parameters of the moisturizing agent within a specific range (0.5-5.0 mass%) rather than using excessive amounts. This parameter control, combined with the multi-component formulation, provides sufficient moisture for softness while preventing over-softening that would compromise paper stiffness and handling properties.
Solution Approach 2:
The composite polyhydric alcohol system provides moisturizing efficiency at lower overall concentrations compared to single agents, reducing the burden on paper stiffness. The synergistic moisture-retention capabilities of multiple alcohols allow achieving desired softness with less total additive, thereby preserving paper structural integrity.
3Quantity of substance
If the concentration and coating amount of chemical solution are adjusted to improve moistness, then the smoothness and toughness are not impaired, but it has not been possible to perform quality improvement in which both of the moistness and the smoothness are improved
Solution Approach 1:
The patent optimizes multiple parameters simultaneously: the concentration of each polyhydric alcohol component, the total chemical solution concentration (0.5-5.0 mass%), and the coating amount. This multi-parameter optimization enables achieving high moistness while maintaining smoothness, overcoming the limitations of single-parameter adjustment in conventional systems.
Solution Approach 2:
The composite moisturizing system with specific alcohol ratios enhances moisture retention efficiency, allowing improved moistness without requiring excessive coating amounts that would compromise smoothness. The synergistic action of multiple alcohols provides superior performance at optimized concentrations.
4Quantity of substance
If an excessive content of moisturizing agent is used, then the moistness is enhanced, but the toughness is impaired and the sensation of thickness is reduced
Solution Approach 1:
The patent precisely controls the total moisturizing agent content within 0.5-5.0 mass% and optimizes the individual component ratios. This parameter control ensures sufficient moisture for enhanced moistness while preventing excessive softening that would impair toughness and reduce the sensation of thickness.
Solution Approach 2:
The composite polyhydric alcohol formulation provides high moisturizing efficiency at lower total concentrations compared to conventional single agents. The synergistic moisture-retention properties of multiple alcohols allow achieving enhanced moistness with less total additive, thereby preserving paper toughness and thickness sensation.
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 solution effectively achieves a high level of both moistness and smoothness, along with excellent toughness and sensation of thickness, as demonstrated by organoleptic tests and physical property measurements, without compromising the paper's strength or increasing stickiness.
Implementation Method 1
the conventional moisturizing tissue is one in which a water-retaining property in paper is increased due to a moisture absorption operation of the moisturizing agent
Implementation Method 2
both of 'smoothness' and 'moistness' are improved... capable of providing significant sensation of the 'smoothness'
Data Source
AI summary
[Problem] To provide tissue paper excellent in “moistness” and “smoothness”. [Solution] The problem can be solved by tissue paper being two-ply tissue paper, in which a basis weight per one ply is greater than 12.9 g/m2 and less than 16.8 g/m2, a paper thickness in the two-ply state is not less than 128 μm nor more than 150 μm, and a chemical agent containing glycerin and 1,3-propanediol in a total amount of 83.7 mass % or more and having a mass ratio between glycerin and 1,3-propanediol of greater than 1:0.14 and less than 1:6.64, is contained in an amount of greater than 2.3 g/m2 and less than 6.1 g/m2.