Plastic Packaging with Groove-Mounted Cardboard Framework
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Solution Overview
Problem
The packaging industry faces challenges in reducing plastic usage while maintaining mechanical strength, as well as environmental concerns related to recycling, particularly with cardboard reinforcement structures that require gluing and complicate the recycling process.
Innovation Solution
A bi-material packaging solution using a recyclable plastic container with a cardboard or bio-sourced external structure, where the cardboard is shaped to fit into a peripheral groove on the container, eliminating the need for gluing and allowing easy separation and recycling, and enhancing rigidity without complex manufacturing processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of substance
If the plastic wall thickness is reduced to reduce plastic usage and carbon footprint, then the environmental impact is improved, but the mechanical strength and rigidity of the container deteriorates
Solution Approach 1:
The patent combines plastic and cardboard materials to create a composite packaging structure. The plastic container provides moisture barrier and basic containment, while the external cardboard framework provides mechanical reinforcement and rigidity. This composite approach allows reduction of plastic thickness while maintaining overall structural strength.
Solution Approach 2:
The packaging is divided into two separate functional components: an internal plastic container for containment and an external cardboard framework for structural support. This segmentation allows each material to perform its optimal function independently, with the cardboard reinforcing the plastic without requiring adhesive bonding.
2Strength
If an external cardboard structure is added to reinforce rigidity, then the mechanical strength is improved, but the manufacturing complexity and cost increases due to gluing requirements
Solution Approach 1:
The patent extracts and eliminates the gluing step from the manufacturing process by designing a mechanical interference fit system. The cardboard framework is shaped with protrusions that engage with corresponding recesses in the plastic container, providing secure attachment without adhesives. This simplifies manufacturing and reduces costs while maintaining structural integrity.
Solution Approach 2:
The cardboard framework and plastic container are designed to self-assemble through mechanical interlocking features. The protrusions and recesses automatically align and secure the components together during assembly, eliminating the need for external gluing operations and simplifying the manufacturing process.
3Strength
If gluing is used to attach the cardboard structure to the plastic container, then the mechanical strength is improved, but the environmental harm increases due to harmful substances and recycling difficulties
Solution Approach 1:
The patent converts the potential harm of requiring strong bonding methods into a benefit by using mechanical interlocking instead of chemical adhesives. The protrusion-recess mechanism provides sufficient bonding strength without harmful substances, and the separable design actually facilitates recycling by allowing easy separation of the plastic and cardboard components.
Solution Approach 2:
The packaging design enables easy separation of the plastic container and cardboard framework through the mechanical interlocking mechanism. This facilitates selective recycling and material recovery, as the components can be detached without residue and processed separately through their respective recycling channels.
4Stability of the object's composition
If the cardboard structure is pre-formed into three-dimensional configuration before application, then the structural integrity is improved, but the manufacturing complexity increases due to additional forming steps
Solution Approach 1:
The cardboard framework is pre-cut and pre-shaped into its three-dimensional configuration before assembly with the plastic container. This preliminary forming ensures structural integrity and proper fit, while the design allows this pre-forming to be done efficiently without complex multi-step processes, as the framework is created as a single integrated piece.
Data Source
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Figure 3
Figure 4~5
AI summary
Packaging specifically suitable for containing food, comprising, on the one hand, a container made of a plastic-type material having a continuous base and peripheral wall (5), the upper edge (6) of the peripheral wall (5) opposite the base defining an opening and being provided with a peripheral rim (7) extending radially outwards, and on the other hand, an outer lining (40) cut from a flat blank of recyclable cardboard-type material and positioned in contact with the outer face of the peripheral wall (5), detachable means for attaching the lining (40) to the container being provided. These attachment means consist of a peripheral groove (8) running along the outer face of the peripheral wall (5) of the container, defining a housing space fitted for an upper edge of the lining (40) shaped to fit the shape of the groove (8).