Retort Container End Sealing for High-Pressure Seam Integrity
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Solution Overview
Problem
Traditional retort containers constructed of metal are costly and may not be aesthetically appealing, and there is a need for containers that can withstand high internal pressures during retort processing without compromising seams, especially when made of thinner metal or non-metallic materials.
Innovation Solution
A retort container design where a metal end is thermally fused to the container body using heat-sealable materials, allowing for improved blow-off resistance and enabling the use of thinner metal or non-metallic materials, with the fusion process involving induction heating and cooling to secure the metal end to the container body without external pressure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional metal construction is used for retort containers, then seam integrity during retort processing is maintained, but cost increases and aesthetic appeal decreases
Solution Approach 1:
The patent employs composite construction by combining metal ends with non-metallic container bodies (plastic or paper). The metal end provides necessary strength and sealability, while the non-metallic body reduces overall metal consumption. This composite approach resolves the contradiction by maintaining seam integrity through proper design of the metal end and sealing mechanism while significantly reducing the quantity of metal required compared to traditional all-metal construction.
2Quantity of substance
If thinner metal is used for container body, then cost and weight are reduced, but blow-off resistance under high internal pressure deteriorates
Solution Approach 1:
The patent uses composite materials where the container body can be made of thinner metal, plastic, or paper while the metal end provides the necessary structural support and blow-off resistance. The metal end acts as a reinforcement that compensates for the reduced thickness of the container body, allowing cost and weight reduction without sacrificing essential strength properties.
Solution Approach 2:
The patent applies local quality by concentrating the metal material specifically at the end portions of the container where sealing and pressure resistance are most critical, while allowing the container body to use thinner or non-metallic materials. This localized application of metal provides blow-off resistance exactly where needed without requiring thick metal throughout the entire container structure.
3Quantity of substance
If non-metallic materials are used for container body, then aesthetics and cost are improved, but ability to withstand retort processing pressure deteriorates
Solution Approach 1:
The patent successfully implements composite materials by pairing non-metallic container bodies (plastic or paper) with metal ends. The non-metallic body provides aesthetic advantages and cost benefits, while the metal end provides the necessary pressure resistance to withstand retort processing. The combination resolves the contradiction by assigning different functional requirements to different materials in the composite structure.
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 solution enhances the container's ability to withstand high internal pressures during retort processing by ensuring a secure thermal bond between the metal end and the container body, allowing for the use of thinner metals or non-metallic materials and providing uniform radial expansion without compromising the seam integrity.
Implementation Method 1
induction heating the metal end to melt the first heat-sealable material
Implementation Method 2
cooling the first heat-sealable material so as to fuse the metal end onto the container body
Data Source
AI summary
A method is described for making a retort container having one or two metal ends. A heat-sealable material is present on one or both of the container side wall and the/each metal end. The/each metal end is seamed onto the container body, and the resulting container assembly is conveyed on a conveyor adjacent to an induction sealing head and then adjacent to a cooling device. A pressure belt engages the upper end of the container assembly to keep the metal end from coming off the container body during the induction heating and cooling processes.