Folded Absorbent Article With Release-Sheet-Free Adhesive Protection
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Solution Overview
Problem
Disposable absorbent articles that adhere to surfaces without a release sheet are needed to protect various surfaces from fluids, but existing solutions require a release sheet for adhesive protection.
Innovation Solution
A disposable absorbent article with a back sheet and an absorbent structure, where the back sheet has adhesive zones and treated zones that are aligned in specific folds to protect the adhesive during storage and exposure for use, eliminating the need for a separate release sheet.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a release sheet is used to protect the adhesive zone, then the adhesive is protected from contamination during storage and transport, but the device complexity increases due to the additional component
Solution Approach 1:
The back sheet is folded to align the adhesive zone with the treated zone, merging the protective function into the existing back sheet structure rather than using a separate release sheet. This eliminates the need for an additional component while maintaining adhesive protection during storage and transport.
Solution Approach 2:
Instead of using a separate release sheet to protect the adhesive, the invention uses the back sheet itself folded over to provide protection. The treated zone on the back sheet serves as the release surface, inverting the traditional approach where a separate release sheet would be used.
2Ease of operation
If the adhesive zone is exposed during storage, then application is simplified, but the adhesive becomes contaminated or loses effectiveness
Solution Approach 1:
The back sheet is pre-folded during manufacturing to align the adhesive zone with the treated zone, creating a protected configuration before storage. This preliminary action ensures the adhesive remains protected while allowing quick deployment by simply unfolding the back sheet during application.
Solution Approach 2:
The adhesive zone is nested within the folded back sheet structure, with the treated zone providing the release surface. This nesting protects the adhesive while maintaining easy access through the folding mechanism.
3Reliability
If a separate release sheet is used, then adhesive protection is ensured, but the quantity of material increases
Solution Approach 1:
The protective function traditionally requiring a separate release sheet is merged into the back sheet itself through folding. The treated zone on the back sheet serves dual purposes as both a structural component and a release surface, eliminating the need for additional material.
Solution Approach 2:
The back sheet is designed to serve multiple functions: as a structural component, as a protective cover for the adhesive zone, and as a release surface through its treated zone. This multi-functionality eliminates the need for a separate release sheet.
4Reliability
If the adhesive zone is protected during storage, then contamination is prevented, but the ease of application decreases due to additional steps
Solution Approach 1:
The back sheet is pre-folded during manufacturing to create the protected configuration. During application, the user simply unfolds the back sheet to expose the adhesive zone, making the process quick and intuitive without requiring additional steps to remove a separate release sheet.
Solution Approach 2:
The folded back sheet structure is self-contained and self-explanatory. The treated zone automatically serves as the release surface when folded over the adhesive zone, and the protection is automatically provided without requiring additional components or complex procedures.
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
The absorbent article effectively adheres to surfaces while keeping the adhesive protected during storage and transport, allowing for easy application without a release sheet, enhancing convenience and reducing contamination risks.
Implementation Method 1
The first adhesive zone and the second adhesive zone include pressure sensitive adhesive that has been applied in a slot coat pattern
Implementation Method 2
The first treated zone and the second treated zone include silicone that has been applied in a spray pattern
Data Source
AI summary
A method of making a folded absorbent article includes the steps of: providing an absorbent structure; providing a liquid-impermeable back sheet having a body-facing surface and a substrate-facing surface; joining the absorbent structure in facing relation to the body-facing surface of the back sheet to define an absorbent article; applying adhesive to the substrate-facing surface of the back sheet to define a first adhesive zone and a second adhesive zone; treating portions of the substrate-facing surface of the back sheet to define a first treated zone and a second treated zone; folding the absorbent article to align the first adhesive zone in facing relation with the first treated zone; and folding the absorbent article to align the second adhesive zone in facing relation with the second treated zone.