Wet Sheet Package Adhesive Sealing via Absorbent Sheet
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Solution Overview
Problem
Existing wet sheet packages experience a significant drop in sealing performance due to the adhesive strength reduction of the open/close flap when it gets wet from water or oil inside the package, leading to instability and quality issues.
Innovation Solution
A microporous liquid-absorbent sheet is securely attached to the top surface of the container near the output opening, making it adherable to the open/close flap, preventing the formation of a liquid film on the adhesion surface even when exposed to water or oil, thus maintaining adhesive strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If pressure-sensitive adhesive is coated on the open/close flap to seal the output opening, then sealing property is improved, but adhesive strength drops when the adhesive gets wet from water or oil in the inside liquid
Solution Approach 1:
A microporous liquid-absorbent sheet is introduced as an intermediary layer between the pressure-sensitive adhesive on the open/close flap and the inside liquid containing water or oil. This intermediate sheet absorbs the liquid before it can reach and wet the adhesive, thereby maintaining adhesive strength while preserving sealing functionality.
Solution Approach 2:
The invention employs a microporous liquid-absorbent sheet with porous structure that allows it to absorb water or oil from the inside liquid through capillary action. The porous material selectively absorbs liquid while preventing it from reaching the pressure-sensitive adhesive, thus resolving the contradiction between sealing and adhesive strength.
2Reliability
If an internal frame or tray is inserted to prevent wetting of the adhesive area, then sealing property is improved, but package bulk increases making it inconvenient to carry
Solution Approach 1:
Instead of rigid internal frames or trays that increase package bulk, the invention uses a flexible microporous liquid-absorbent sheet that can be conformally attached to the inner surface of the open/close flap. This thin film structure provides liquid protection without significantly increasing package volume, making it convenient to carry.
Solution Approach 2:
The invention extracts only the essential liquid-absorbing function from complex internal frame or tray structures, implementing it through a simple microporous sheet that performs the same protective function with minimal added bulk.
3Strength
If the area around the output opening is made less likely to get wet by inserting structures, then adhesive strength is maintained, but device complexity increases
Solution Approach 1:
The microporous liquid-absorbent sheet serves multiple functions simultaneously: it absorbs excess liquid, prevents wetting of the adhesive, and maintains the sealing property. This multi-functional approach avoids the need for multiple separate components, thereby reducing overall device complexity while maintaining adhesive strength.
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
This solution enhances the sealing properties and durability of the package by preventing adhesive strength loss, ensuring the wet sheets remain sealed and maintaining quality over repeated use.
Implementation Method 1
a microporous liquid-absorbent sheet exhibiting water absorbency or oil absorbency
Implementation Method 2
the liquid-absorbent sheet securely attached to the top surface of the container... preventing the formation of a liquid film on the adhesion surface
Data Source
AI summary
A wet sheet package storing folded wet sheets includes a package container and an open/close flap provided in the top surface of the container. An output opening through which to take out the wet sheets is provided at the approximate center in the top surface of the container, the open/close flap has a separation stopping part formed on one end, as deemed appropriate, in order to seal the output opening, and the open/close flap opens and closes the output opening by acting, together with the separation part of the top surface, as an open/close lid of the package container. A liquid-absorbent sheet with a void space at its approximate center is securely attached to the top surface of the container, and the open/close flap is adherably arranged on the top surface of the liquid-absorbent sheet.