Sanitary tissue package
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Solution Overview
Problem
Existing film packaging type sanitary tissue packages face issues with difficult opening and high resistance during tissue extraction, especially when the bundle is small and lightweight, leading to lifting or falling of the package.
Innovation Solution
A sanitary tissue package with a flexible resin film overwrap wrapping and a take-out port forming portion featuring easy tear lines that form an end portion narrowing, widened, and wide portions, along with acute corners and free edge pieces, facilitating smooth extraction and preventing falling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a mere slit-shaped take-out port is used in overwrap wrapped package, then the package shape is retained well, but the resistance at the time of taking out the sanitary tissue is large
Solution Approach 1:
The take-out port is segmented into multiple functional zones: a chamfered portion for initial penetration, a widened portion for reduced resistance, and a wide portion for smooth extraction. This segmentation allows each zone to perform its specific function optimally while maintaining overall package integrity.
Solution Approach 2:
Different regions of the take-out port are given different geometric properties: the chamfered portion has an inclined surface for easy penetration, the widened portion has increased width for reduced friction, and the wide portion provides maximum opening for smooth extraction. This local differentiation of properties solves the contradiction between shape retention and extraction ease.
2Weight of moving object
If the number of sets forming the bundle is small and the weight of the bundle is light, then the package is compact and portable, but the entire package is likely to be lifted during extraction
Solution Approach 1:
The chamfered portion is designed to be penetrated first, creating an anchor point that stabilizes the package before tissue extraction begins. This preliminary action prevents the lightweight package from being lifted during the extraction process.
3Device complexity
If a mere chamfered rectangular, rectangular, or elliptical opening is used, then the package structure is simple, but the sheet easily falls into the package from the opening
Solution Approach 1:
The take-out port extends not only in the horizontal plane but also in the depth direction with the wide portion having a length greater than the bundle thickness. This three-dimensional configuration creates an L-shaped path that prevents tissues from falling back into the package while maintaining structural simplicity.
Data Source
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AI summary
To provide a film packaging type sanitary tissue package excellent in a take-out property and a fall prevention property. The problem is solved by a sanitary tissue package in which a take-out port forming portion surrounded by a pair of first easy tear lines that extends along a width direction in which folded edges of the sanitary tissue extend and is spaced apart in a depth direction orthogonal to the width direction and a pair of second easy tear lines that extends along the depth direction and connects end portions of the pair of first easy tear lines is included in a top surface part, the take-out port forming portion forms a shape having an end portion narrowing portion in which the pair of first easy tear lines gradually approaches each other from connection portions with respect to the second easy tear lines to a side of a center portion of the bundle in the width direction and a width therebetween narrows, a widened portion in which the pair of first easy tear lines is gradually separated from each other from a side of the end portion narrowing portion to the side of the center portion of the bundle in the width direction and the width therebetween widens, and a wide portion in which the pair of first easy tear lines is gradually separated from each other to bulge outward in the depth direction further toward the center portion of the bundle in the width direction from the widened portion, and by peeling off an inside of a range of the take-out port forming portion, acute corner portions are formed at positions between the first easy tear lines and the second easy tear lines, and free edge pieces including edges in a range from the end portion narrowing portion to the wide portion are formed.