Tissue paper

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Solution Overview

Problem

Conventional moisturized tissues prioritize skin touch but are poor in paper strength and have a dense surface, making them prone to breakage and difficult to absorb liquids like snot.

Innovation Solution

Moisturized tissue paper with a high proportion of NBKP (>70 mass %), a paper thickness of 220 to 330 μm, and a high polyol content (26.0 mass % or more), along with specific surface properties such as arithmetic mean curvature and developed area ratio, to enhance softness, strength, and snot wiping properties.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of operation

If the blending ratio of LBKP is increased to improve softness and surface smoothness, then the skin touch quality is improved, but the paper strength deteriorates and the tissue becomes prone to breakage

Engineering Contradiction:

Improveskin touch qualityVSAvoidpaper strength

Core Design Contradiction:

Ease of operationVSStrength

Solution Approach 1:

The patent applies parameter changes by precisely controlling the LBKP blending ratio within 10-40 mass% and the paper thickness within 200-350 μm. By optimizing these parameters, the invention achieves a balance where the surface remains smooth enough for skin comfort while maintaining sufficient strength to prevent breakage during use.

Inventive Principle:

Principle #35Parameter changes

2Ease of operation

If the surface layer is made dense to retain moisturizer and provide smoothness, then the moist feeling is improved, but the liquid absorption capability deteriorates

Engineering Contradiction:

Improvemoist feelingVSAvoidliquid absorption capability

Core Design Contradiction:

Ease of operationVSQuantity of substance

Solution Approach 1:

The patent applies local quality by creating a surface layer with specific properties (smoothness and moisturizer retention) while maintaining different properties in the bulk structure (porosity for absorption). The surface layer density is optimized to retain moisturizer, while the overall paper structure maintains sufficient porosity through controlled LBKP content to absorb liquids effectively.

Inventive Principle:

Principle #3Local quality

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 softness, moist feeling, firm feeling, and resistance to breakage while maintaining effective snot wiping properties due to the high NBKP content and polyol moisture retention.

Implementation Method 1

a chemical solution containing the moisturizer remains on the surface layer, and an effect such as a moist feeling from the chemical solution is likely to develop on a paper layer surface due to moisture increase resulting from moisture absorption

Methodology Applied

Scientific EffectMoisture absorption: Absorption (physical)

Data Source

PatentUS11686046B2Tissue paper

Publication Date: 2023.06.27 DAIO PAPER CORP

AI summary

Provided is a moisturized tissue excellent in strength and snot wiping property. In the moisturized tissue paper, a paper thickness is 220 to 330 μm, a basis weight is 15 to 18 g/m2 per ply, a proportion of NBKP in the pulp combination is more than 70 mass %, a chemical solution content is 26 to 32 mass %, an arithmetic mean curvature at a peak point of an outer surface in an unpressurized state (Spc (1)) is 4.0 to 4.8 (1/mm), and a developed area ratio at an interface on the outer surface (Sdr) is 0.020 to 0.030 (−).