3-Ply Tissue Paper Thickness and Roughness Control
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Solution Overview
Problem
Conventional multi-ply tissue papers struggle to balance softness, smoothness, and paper strength, making them unsuitable for effectively removing oil-based cosmetics like lipstick and foundation.
Innovation Solution
A 3-ply tissue paper with a specific paper thickness, arithmetic mean roughness, compression work, and compression recovery rate, combined with an aqueous moisturizer, is developed. The tissue paper is manufactured through calendaring and application of a chemical solution using a gravure roll and metal rolls.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the basis weight per each ply is increased to increase paper thickness and bulkiness, then the thickness texture and bulkiness can be exhibited, but it becomes difficult to obtain quality with softness and smoothness
Solution Approach 1:
The patent applies parameter changes by precisely controlling the paper thickness within 176-230 μm for three plies, arithmetic mean roughness Sa within 0.007-0.020 mm, compression work between 1.70-2.40 gf cm/cm², and compression recovery rate between 46.0-54.5%. These specific parameter ranges resolve the contradiction by finding the optimal balance point where thickness is sufficient for bulkiness while surface roughness and compression characteristics maintain softness and smoothness.
Solution Approach 2:
The patent uses composite materials by combining three sheets of 1-ply base paper with an aqueous moisturizer containing glycerin and other ingredients. This composite structure allows the tissue paper to achieve both thickness for bulkiness and the softness/smoothness required for skin contact, as the moisturizer component provides lubrication and softness while the multi-ply structure provides thickness.
2Ease of operation
If conventional moisturized tissue is designed with importance put on skin touch to provide softness and smoothness, then skin damage is reduced, but paper strength becomes poor and the tissue apt to break
Solution Approach 1:
The patent resolves this contradiction by changing the parameter ranges: paper thickness is controlled at 176-230 μm (not too thin to break), arithmetic mean roughness Sa at 0.007-0.020 mm (smooth for skin touch), compression work at 1.70-2.40 gf cm/cm² (balanced strength and softness), and compression recovery rate at 46.0-54.5%. These optimized parameters ensure the tissue is strong enough to break less while remaining soft and smooth for skin contact.
Solution Approach 2:
The patent uses a composite material structure combining three sheets of 1-ply base paper with an aqueous moisturizer containing glycerin, sorbitol, and other ingredients. This composite structure provides both strength (from the multi-ply paper structure) and softness/smoothness (from the moisturizer components), resolving the contradiction between paper strength and skin-touch quality.
3Ease of manufacture
If 2-ply tissue paper is used to maintain simplicity and cost-effectiveness, then manufacturing is easier and cost is lower, but the thickness texture and bulkiness are insufficient
Solution Approach 1:
The patent applies segmentation by dividing the tissue paper into three separate 1-ply base papers that are stacked and bonded together. This segmentation allows each layer to be manufactured independently using standard processes, maintaining manufacturing simplicity while achieving greater overall thickness and bulkiness through the combination of three layers rather than two.
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 resulting tissue paper is suitable for performing 'tissue off' of oil-based cosmetics, offering excellent softness, smoothness, and controlled strength, ensuring effective removal without damaging the skin.
Implementation Method 1
picking up a chemical solution with a gravure roll; transferring the picked-up chemical solution to a metal roll
Implementation Method 2
applying the transferred chemical solution to a surface of 3-ply base paper
Implementation Method 3
Calendaring a 3-ply base paper through between two metal rolls
Data Source
AI summary
Provided is 3-ply tissue paper suitable for performing “tissue off” and excellent in softness and smoothness.In the 3-ply tissue paper containing an aqueous moisturizer, a paper thickness for three plies is 176 to 230 μm, an arithmetic mean roughness Sa is 0.007 to 0.020 mm, and a compression work is 1.70 to 2.40 gf·cm/cm2 and a compression recovery rate is 46.0 to 54.5% for four sets of three plies, twelve plies in total.