Food Packaging Container with Adhesive Cavity Seal
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Solution Overview
Problem
Existing plastic containers made of PET for food packaging face challenges such as deformation during heat sealing and contamination risks due to high sealing temperatures and adhesive application issues, which affect seal quality and recyclability.
Innovation Solution
A container design featuring a peripheral edge with a cavity filled with a heat-activatable adhesive bead, allowing for lower temperature heat sealing without deforming the container and minimizing adhesive dispersion, combined with a method for producing such containers using automated adhesive dispensing systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If heat sealing is performed at high temperature to seal PET containers, then the seal strength is improved, but the container peripheral edge deforms
Solution Approach 1:
A thermoplastic adhesive layer is introduced as an intermediary substance between the closure lid and the container peripheral edge. This adhesive layer has a lower melting point than PET, allowing sealing at reduced temperatures that prevent container deformation while still providing strong sealing through the adhesive's softening and bonding properties
2Reliability
If the container peripheral edge is contaminated with food substance, then the seal quality deteriorates, but multilayer sealing layers increase contamination resistance
Solution Approach 1:
The adhesive layer changes its physical parameters (viscosity, softening point) in response to temperature and contamination conditions. It can accommodate minor contamination while maintaining seal integrity through its specific softening characteristics, eliminating the need for complex multilayer structures
3Reliability
If adhesive is applied to the container peripheral edge, then seal reliability is improved, but adhesive dispersion causes production waste
Solution Approach 1:
The adhesive application is segmented into discrete controlled portions rather than continuous coating. The adhesive is applied in specific zones or patterns that ensure adequate sealing while minimizing excess material that could disperse and create waste during production
Solution Approach 2:
The adhesive is applied with varying distribution characteristics at different locations on the peripheral edge. Areas requiring stronger sealing receive more adhesive, while areas with lower requirements receive less, optimizing both seal reliability and material efficiency
4Reliability
If multilayer material with sealing layer is used, then seal fluid-tightness is improved, but recyclability of production trimmings deteriorates
Solution Approach 1:
The adhesive layer's thermal parameters (softening point, viscosity range) are specifically selected to enable effective sealing at temperatures below PET's melting point. This allows single-layer PET containers to achieve fluid-tight seals without contamination risk, maintaining material purity and recyclability while eliminating the need for multilayer constructions
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 approach ensures a strong, fluid-tight seal while maintaining container transparency and recyclability, reducing waste and production costs, and preventing food contamination during handling and storage.
Implementation Method 1
an adhesive layer in the form of a bead that fills the cavity formed in the peripheral edge and projects above it, said adhesive being an adhesive that can be activated with heat and having a softening or melting point lower than that of the plastic material of the container
Implementation Method 2
said adhesive being an adhesive that can be activated with heat
Data Source
Figure 1~3
Figure 4~7
Figure 8~9
AI summary
A container (1;20;30) made of plastic material for packaging products, in particular food products, is described, the container comprising a bottom (2), side walls (3) and a peripheral edge (5) extending substantially along the entire perimeter of the container (1;20;30), the container (1;20;30) being characterized in that said peripheral edge (5) has a cavity (7) having a substantially perimetral extension and open upwards, said cavity (7) being filled with an adhesive layer (8). A packaging (40) comprising a container as described above and a closure lid (41) sealingly applied onto the peripheral edge (5) by means of heat sealing are also described. Methods for the production of the aforementioned container (1;20;30) and the aforementioned package (40) are also described.