Hygienic tissue paper
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Solution Overview
Problem
Conventional hygienic tissue paper rolls often tear or pull out extra sheets when attempting to cut at perforations, making it difficult to properly cut off a sheet without stability issues.
Innovation Solution
Hygienic tissue paper with first slits disposed in the longitudinal direction at predetermined intervals, where the slits extend in the width direction and include perforations with increasing cut lengths from the ends towards the center, allowing for stable cutting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional uniform perforations are used in tissue paper rolls, then the structure is simple and easy to manufacture, but the cutting reliability is poor causing sheets to tear or pull out extra sheets
Solution Approach 1:
The patent applies local quality by varying the perforation depth across different regions of the tissue paper. Specifically, the perforations have different depths in the longitudinal direction, creating zones with different cuttability. This allows the paper to be cut reliably at specific locations while maintaining structural integrity elsewhere, resolving the contradiction between cutting reliability and structural simplicity.
Solution Approach 2:
The patent segments the perforation structure into multiple depth zones along the longitudinal direction. By dividing the perforation depth into different segments (shallower regions and deeper regions), the patent creates distinct functional zones that control where cutting occurs. This segmentation enables reliable cutting at intended locations while preventing unwanted tearing or extra sheet removal.
2Ease of operation
If the tissue paper roll is not fixed during cutting, then the ease of operation is improved, but the cutting precision deteriorates causing improper cutting at perforation positions
Solution Approach 1:
The patent applies preliminary action by pre-forming perforations with varying depths before the cutting operation. These pre-formed depth variations create predetermined cutting zones that guide the cutting process. When the user pulls the tissue paper, the cutting naturally occurs at the pre-designed locations with appropriate depth, ensuring precise cutting even without fixing the roll, thus resolving the contradiction between ease of operation and cutting precision.
Data Source
AI summary
A hygienic tissue paper includes first slits that are disposed in a longitudinal direction at predetermined intervals, the first slits extending in a width direction intersecting the longitudinal direction, wherein the first slits each include perforations, and wherein a cut length of each of the perforations increases from at least one end in the width direction toward a central portion in the width direction.