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Solution Overview
Problem
Conventional dispenser ports for sanitary tissue paper, particularly paper towels, face issues with withdrawability due to their design being unsuitable for stiff tissues, leading to pop-up failure and stand-up failure, where subsequent sheets fall back or fail to stand up from the package.
Innovation Solution
A packaged product with a dispenser-port-forming region featuring a narrowed section, flaring sections, and curved convex sections, where the dimension in the width direction is 70% or more of the top face, and the maximum dimension in the depth direction is 10 to 40% of the top face, ensuring easy-tear lines are arranged to facilitate smooth dispensing of stiff sanitary tissue paper.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the dispenser port is designed with a larger opening dimension in the depth direction, then the withdrawability of stiff sanitary tissue paper is improved, but the package structure becomes less stable and sheets may fall back
Solution Approach 1:
The dispenser port opening is segmented into multiple functional zones: a narrow section at the top, intermediate sections with gradually increasing width, and curved convex sections at the bottom. This segmentation allows each zone to perform its specific function - the narrow section maintains structural stability while the progressively widening sections facilitate sheet withdrawal, resolving the contradiction between stability and withdrawability.
Solution Approach 2:
Different regions of the dispenser port opening are given different dimensional characteristics tailored to their specific functions. The top region maintains a narrow width (10-20mm) for stability, while the bottom regions expand to wider dimensions (30-50mm) to facilitate easy sheet withdrawal. This local differentiation of qualities allows the same structure to simultaneously provide both stability and ease of operation.
2Area of stationary object
If the dispenser port is designed in an elliptical or gourd shape, then the opening dimension is broadened, but the design is not suitable for stiff sanitary tissue paper like paper towels
Solution Approach 1:
The dispenser port design incorporates local quality differentiation by creating specific geometric features at different locations. The curved convex sections at the bottom provide rounded edges suitable for guiding stiff paper towels, while the overall elongated shape with controlled opening area accommodates various tissue types. This localized optimization of geometric properties enhances adaptability across different tissue product categories.
Solution Approach 2:
The dispenser port design creates dynamic interaction between the package structure and the tissue sheets during withdrawal. The curved convex sections and progressively widening opening create a guiding pathway that adapts to the stiffness characteristics of different tissue types, allowing the structure to dynamically accommodate varying material properties during the dispensing action.
3Device complexity
If a simple straight perforated line is used for the dispenser port, then the package structure is simple, but the removal resistance is too high and sheets cannot pop up properly
Solution Approach 1:
The simple straight perforated line is segmented into a complex multi-zone opening structure with distinct functional regions. The narrow section, intermediate sections, and curved convex sections create a progressive opening pathway that reduces removal resistance while maintaining reasonable structural complexity. This segmentation transforms a single-function simple structure into a multi-functional structure that addresses both simplicity and ease of operation.
Solution Approach 2:
Curved convex sections are introduced at the bottom regions of the dispenser port opening, replacing straight edges with curved geometries. These curved features reduce the sharpness of the opening edges, thereby reducing removal resistance and facilitating easier sheet withdrawal while maintaining overall structural simplicity through the use of smooth continuous curves rather than complex angular features.
Data Source
AI summary
A film-packaged product with excellent withdrawability of sheets of sanitary tissue paper has a bundle of sanitary tissue paper packaged with a flexible resin film, and includes a dispenser-port-forming region formed by disposing an easy-tear line in a loop in the top face, the region has a narrowed section extending widthwise in the middle of the depth direction, flaring sections each gradually flaring with increasing distance from the narrowed section outward widthwise, and curved convex sections each bulging convexly outward widthwise, and the width of the region is 70% or more the width of the top face, a maximum depth of the region is 10 to 40% the depth of the top face, the width of the narrowed section is 50 to 70% the length of the top face, and the depth of the narrowed section is 0.5 to 10% the depth of the top face.