Wet Sheet Package Label Structure for Airtight Resealing
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Solution Overview
Problem
Existing wet sheet flexible packages face issues with airtightness and volatilization of liquids due to gaps between sealing members and adhesive layers, leading to rapid drying of wet sheets, especially when the sealing member is made of synthetic resin and has a planar, hard structure that does not conform to the flexible film bag.
Innovation Solution
Incorporating a substrate with higher compression strength than the film bag between the adhesive layer and the film bag surface, allowing the sealing member to attach without generating gaps, and using a laminated label structure with a planar-viewed annularly shaped cut line to ensure a secure and wide dispensing opening.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a plastic molded member with a lid is attached to the adhesive layer to seal the dispensing opening, then the airtightness is improved and the lid can be opened and closed, but microscopic gaps are generated between the molded member and the adhesive layer causing the wet sheets to dry quickly
Solution Approach 1:
The patent replaces the rigid plastic molded member with a flexible sealing member made of a thin film that can conform to the contours of the adhesive layer. This flexible film sealing member eliminates microscopic gaps by adapting its shape to the adhesive surface, preventing liquid volatilization while maintaining the ability to open and close the dispensing opening.
Solution Approach 2:
The patent changes the physical parameters of the sealing member from rigid and planar to flexible and conformable. By altering the material properties and structural characteristics of the sealing member, it can now properly adhere to the adhesive layer without creating gaps, thus preventing liquid loss through volatilization.
2Ease of operation
If a self-adhesive label is repeatedly peeled off and re-attached to seal the dispensing opening, then the operation is easy and low-cost, but the airtightness becomes lower and the wet sheets tend to be dry
Solution Approach 1:
The patent separates the sealing function from the label function. The flexible sealing member is designed as a distinct component that can be repeatedly attached and detached without compromising airtightness, while the label serves only as an informational element. This segmentation allows the sealing mechanism to maintain reliability through multiple use cycles.
Solution Approach 2:
The patent introduces a flexible sealing member as an intermediary between the adhesive layer and the external environment. This intermediary component provides the actual sealing function, while the self-adhesive label can be easily removed and reattached without affecting the sealing performance, as the flexible sealing member maintains the airtight seal.
3Ease of manufacture
If a planar plastic molded member is pressed against the flexible film bag, then the sealing member can be attached, but the film bag deforms in a wave-like form generating microscopic gaps
Solution Approach 1:
The patent employs a flexible sealing member made of thin film material that can conform to the flexible film bag surface without causing wave-like deformations. This flexible sealing member adapts to the contours of the adhesive layer, ensuring precise surface contact and eliminating microscopic gaps that would compromise sealing effectiveness.
Solution Approach 2:
The patent transitions from a planar sealing member to a curved or contoured flexible sealing member that matches the curvature and surface topology of the film bag and adhesive layer. This curvature adaptation allows the sealing member to maintain continuous contact with the adhesive surface, preventing gap formation while preserving attachment simplicity.
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
Prevents volatilization of the impregnated liquid, maintaining the wet condition of the sheets over a longer period by ensuring a tight seal without deformation of the adhesive layer, facilitating easy removal and reattachment of the sealing member.
Implementation Method 1
a substrate provided between the adhesive layer and the surface of the film bag, and the substrate is composed of a film having higher compression strength than a film composing the film bag
Implementation Method 2
an adhesive layer exposed around the dispensing opening on the surface of the film bag
Data Source
Figure 1
Figure 2~3
Figure 4~5
AI summary
The present invention relates to a wet sheet flexible package 1, including a plurality of wet sheets 2 impregnated with a liquid; a film bag 3 that is a flexible film bag packaging the plurality of wet sheets 2 and including a dispensing opening 31; and a label 5 attached to a surface of the film bag 3, covering the dispensing opening 31, and being able to be peeled off. In the wet sheet flexible package 1, when the label 5 is peeled off from the film bag 3, the dispensing opening 31 is unsealed and an adhesive layer 53 is exposed around the dispensing opening 51 on the surface of the film bag 3. A substrate 54 is provided between the adhesive layer 53 and the surface of the film bag 3, and the substrate 54 is composed of a film having a higher compression strength than a film composing the film bag 53.