Recyclable Food Packaging Box with Segmented Adhesive Bonding
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Solution Overview
Problem
Existing packaging boxes require disinfection, which causes disinfectant to enter the cavity between the outer paper shell and inner membrane, leading to softening of the packaging paper and increased defective products, while also failing to facilitate convenient recycling.
Innovation Solution
A packaging box design with a first adhesive part at the edge of the inner membrane for bonding with the outer paper shell, and a perforated line on the outer paper shell to facilitate easy separation during recycling, along with a second adhesive part around the perforated line to prevent water vapor entry and maintain structural integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the packaging box is soaked in disinfectant bath for sanitation, then the packaging box is sanitized, but the disinfectant enters the cavity between packaging film and wrapping paper causing softening of packaging paper and affecting integrity
Solution Approach 1:
The wrapping paper is divided into multiple independent tearing lines that extend to the edges, creating separate segments between the packaging film and wrapping paper. This segmentation allows the wrapping paper to be easily separated after disinfection, preventing disinfectant from penetrating deep into the cavity and causing softening.
Solution Approach 2:
Tearing lines are pre-set on the wrapping paper before disinfection. These pre-established separation paths allow for quick separation after the brief disinfection process, limiting the exposure time of the wrapping paper to disinfectant and preventing softening while still achieving sanitation.
2Strength
If the wrapping paper is completely bonded with packaging film, then the packaging box integrity is improved, but the recycling process becomes difficult
Solution Approach 1:
The bonding between wrapping paper and packaging film is segmented through multiple tearing lines that create independent sections. This allows the wrapping paper to remain attached during use for integrity, but enables easy separation during recycling by tearing along these pre-defined lines.
Solution Approach 2:
The bonding strength varies locally across the packaging box surface. Areas with tearing lines have reduced bonding strength to facilitate separation, while other areas maintain sufficient bonding for structural integrity during use. This local differentiation resolves the contradiction between integrity and recyclability.
3Ease of operation
If tearing lines extend to the four edges of packaging film and wrapping paper, then recycling convenience is improved, but water vapor enters the cavity causing softening
Solution Approach 1:
Instead of creating complete through-holes at edges, partial tearing lines are implemented that stop before completely penetrating the structure. This provides sufficient separation capability for recycling while maintaining enough structural continuity to prevent water vapor from freely entering the cavity.
Solution Approach 2:
The tearing lines act as intermediaries that provide a controlled separation path. They allow the wrapping paper to be peeled away during recycling while the adhesive bonding in non-tearing areas continues to provide a barrier against water vapor penetration during normal use.
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 design effectively prevents water vapor from entering the cavity during sanitization, maintains the hardness of the packaging box, and allows for easy separation and recycling of the inner and outer components, improving the yield rate and environmental protection.
Implementation Method 1
the edge of the inner membrane includes a first adhesive part, the first adhesive part is bonded with the outer paper shell
Data Source
AI summary
A packaging box includes an outer paper shell and an inner film. At least one edge of the inner film includes a first adhesive portion to be bonded with the outer paper shell. A perforation line or area is disposed on the outer paper shell. The inner film also includes a second adhesive portion, and the second adhesive portion surrounds the perforation line and bonds with the outer paper shell. A covering is disposed at the outside of the outer paper shell to cover the perforation line.