Packaging Tray Sealing Flange Rib Design
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Solution Overview
Problem
Existing packaging technologies face challenges in efficiently sealing polyethylene terephthalate (PET) containers with a film lid while maintaining high production throughput and minimizing contamination, which affects the seal's strength and recyclability.
Innovation Solution
A packaging tray design featuring a continuous rib and arrays of side ribs on the sealing flange, where the rib and side ribs are configured to concentrate heat and pressure for a quick and effective seal, and to guide contaminants away from the sealing area, ensuring a robust and contaminant-free bonding surface.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a polyethylene (PE) laminate is applied to the top surface of a PET tray to enable easy film sealing, then the sealing process becomes rapid and reliable, but the tray becomes more difficult to recycle as PE causes PET to turn cloudy or milky
Solution Approach 1:
The invention extracts the PE laminate layer from the tray structure, eliminating the contamination source while preserving the sealing function through direct PET-to-film bonding. This resolves the contradiction by removing the element that causes recyclability problems while maintaining sealing reliability through alternative bonding mechanisms.
Solution Approach 2:
The invention changes the bonding parameters by using controlled heating and pressure conditions that enable direct PET-to-film sealing without requiring a PE intermediate layer. This allows achieving reliable sealing through optimized thermal and mechanical parameters rather than through material layering.
2Ease of manufacture
If PET is directly bonded to PET film without PE laminate to improve recyclability, then recyclability is improved, but the sealing process requires longer time at elevated temperatures or higher temperatures which reduces production throughput
Solution Approach 1:
The invention optimizes the thermal and pressure parameters of the sealing process to achieve rapid PET-to-PET bonding. By controlling the heating temperature, pressure application, and sealing duration, the process achieves reliable seals within timeframes compatible with high-throughput production, resolving the contradiction between direct bonding recyclability and production speed.
3Ease of manufacture
If the bonding area is reduced to minimize PE contamination, then recyclability is improved, but the seal becomes weaker and more prone to failure
Solution Approach 1:
The invention creates a localized bonding zone with optimized properties - a specific bonding area with controlled geometry and surface characteristics that concentrates the sealing action. This localized approach ensures adequate seal strength while minimizing the overall bonding area and associated PE contamination, resolving the contradiction between seal strength and recyclability.
Solution Approach 2:
The invention prepares the bonding surface in advance through surface treatment or geometric configuration that enhances bonding efficiency. This preliminary preparation allows for effective sealing with reduced bonding area, as the pre-conditioned surface promotes stronger adhesion per unit area, thus maintaining seal strength while minimizing contamination.
4Productivity
If the packing plant operates at high assembly speed, then production throughput is maintained, but foodstuff spillage onto the sealing flange interferes with bonding and reduces seal effectiveness
Solution Approach 1:
The invention designs the sealing flange geometry to convert the harmful effect of spillage into a beneficial outcome. The geometric configuration causes spillage to naturally redirect away from the critical bonding zone, utilizing the spillage path to protect rather than harm the sealing area, thus maintaining both high speed operation and seal effectiveness.
Solution Approach 2:
The invention differentiates the sealing flange into zones with different functions - a contamination-resistant zone that receives spillage and a protected bonding zone that remains clean. This local differentiation allows the flange to handle high-speed operation spillage while preserving the integrity of the bonding area, resolving the contradiction between production speed and seal effectiveness.
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 achieves a strong and reliable seal with reduced contamination, maintaining high production throughput and improving the recyclability of PET trays by effectively removing contaminants and reducing the risk of seal failure and discoloration.
Implementation Method 1
concentrate heat and pressure for a quick and effective seal
Implementation Method 2
concentrate heat and pressure for a quick and effective seal
Implementation Method 3
concentrate heat and pressure for a quick and effective seal
Data Source
Figure 1~2
Figure 3~4
AI summary
A packaging tray (10) comprising a receiving body (16) surrounded by a peripheral flange (18), the flange (18) having an upper surface (20) for receiving a sealing film, wherein the upper surface (20) includes a single continuous rib (24) raised above the upper surface (20) and extending to surround the receiving body (16).