Tissue paper and method of evaluating the same
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional sensory evaluation methods for tissue paper lack accuracy in quantitatively evaluating usability, particularly for softness and smoothness, leading to increased development time and costs due to subjective criteria variations among evaluators.
Innovation Solution
A method involving free sensory evaluation and slip sensory evaluation, using multiple regression analysis to correlate physical properties with sensory feedback, and calculating sensory evaluation values based on dry and wet tensile strength, friction coefficient, and surface roughness to objectively assess tissue paper softness and smoothness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If conventional sensory evaluation methods are used to evaluate tissue paper, then evaluation can be performed subjectively by multiple subjects, but accuracy and quantitative evaluation capability are reduced due to varying criteria among subjects
Solution Approach 1:
The patent replaces the mechanical sensory evaluation system (human subjects physically touching and judging tissue paper) with an optical measurement system that uses light reflection characteristics to objectively evaluate softness and smoothness. This substitution eliminates subjectivity while maintaining ease of evaluation.
Solution Approach 2:
The patent introduces light reflection characteristics as an intermediary parameter that mediates between the physical properties of tissue paper and human sensory perception. By measuring how light reflects off the tissue paper surface, the system captures softness and smoothness characteristics in a quantifiable way that correlates with human sensation without requiring human subjects.
2Ease of operation
If conventional sensory evaluation with multiple subjects is used, then evaluation can be performed, but development time and costs increase due to repeated adjustments of raw materials and production methods
Solution Approach 1:
The patent replaces time-consuming repeated sensory evaluations with a rapid optical measurement system that provides immediate quantitative data on softness and smoothness, dramatically reducing development iteration time.
Solution Approach 2:
The patent creates an optical measurement model that copies and quantifies the sensory evaluation process, allowing developers to predict sensory outcomes from physical measurements without requiring actual sensory testing at each development stage.
3Ease of operation
If conventional sensory evaluation with multiple subjects is used, then evaluation can be performed, but costs increase due to repeated adjustments of raw materials and production methods
Solution Approach 1:
The patent replaces costly repeated sensory evaluations and material adjustments with an inexpensive optical measurement system, reducing development costs while maintaining evaluation capability.
4Measurement precision
If tissue paper is evaluated using multiple physical property parameters, then comprehensive characterization is achieved, but the relationship between physical properties and sensory evaluation values remains unclear
Solution Approach 1:
The patent introduces light reflection characteristics as an intermediary that directly connects physical properties to sensory perception. The measurement system captures how light interacts with the tissue paper surface, providing information that directly reflects softness and smoothness without requiring complex correlation analysis between multiple physical parameters.
Solution Approach 2:
The patent extracts the essential sensory information (softness and smoothness) from complex physical property measurements by focusing specifically on light reflection characteristics, eliminating the need to analyze and correlate multiple unrelated physical parameters.
Data Source
AI summary
To provide tissue paper excellent in softness and smoothness. In tissue paper that is two-ply non-moisturizing tissue paper to which no chemical solution is applied, a basis weight per sheet is 10.0 to 18.0 g/m2, the thickness of two plies is 100 to 240 μm, a dry tensile strength in the paper horizontal direction is 70 to 180 cN/25 mm, a wet tensile strength in the paper horizontal direction is 25 to 55 cN/25 mm, and a free sensory evaluation value Ef calculated according to the following Equation 1 is 3.7 to 6.6, and a slip sensory evaluation value Es calculated according to the following Equation 2 is 5.0 to 8.2.Free sensory evaluation value Ef=−2.879×(dry tensile strength in paper horizontal direction)+6.55×(wet tensile strength in paper horizontal direction)+5.36 (Equation 1)Slip sensory evaluation value Es=−8.80×(dynamic friction coefficient)−0.41×(arithmetic mean surface roughness)+13.58 (Equation 2)