Tray Foil Local Heating for Sealing Integrity
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Solution Overview
Problem
Existing methods for arranging a foil in a tray face difficulties such as cutting warm foil, which is challenging, and achieving an airtight seal due to sagging and channel formation when components are not accurately positioned, leading to deformation and sealing issues.
Innovation Solution
The method involves heating a central zone of the tray foil to adhere to the abutting portions of the flange while keeping the outer edge non-heated, ensuring it remains flat and preventing channel formation, and using a device with heating zones to control foil deformation and positioning for precise fitting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the entire tray foil is heated to adhere to the tray, then the adhesion strength is improved, but the foil becomes difficult to cut and may deform causing channel formation
Solution Approach 1:
The patent applies heating locally only to the central zone of the tray foil that contacts the bottom and upright wall, while the outer edge remains unheated. This local differentiation allows the heated central zone to provide strong adhesion while the unheated outer edge remains flat and easy to cut, resolving the contradiction between adhesion strength and cutting ease.
2Area of stationary object
If the heated zone extends to the outer edge of the flange, then the adhesion coverage is improved, but channel formation occurs when flange components are not accurately positioned
Solution Approach 1:
The patent limits the heated zone to not extend beyond the tray opening to the outer edge of the flange. This creates a gradient where the heated central zone provides adhesion coverage where needed, while the unheated outer edge provides a stable, flat sealing surface that is tolerant of positioning variations, thus improving sealing reliability.
Solution Approach 2:
The unheated outer edge acts as a pre-prepared cushion or buffer zone that compensates for potential positioning inaccuracies of the flange components. By maintaining this unheated margin, the patent prevents channel formation that would otherwise occur if the heated zone extended to the flange edge, thereby cushioning against sealing failures.
3Strength
If the tray foil is heated to high temperature for adhesion, then the adhesion strength is improved, but the foil deformation increases causing sealing issues
Solution Approach 1:
The patent applies heat only to the central zone of the foil, creating a local quality difference where the heated area achieves strong adhesion while the unheated outer edge maintains its original flat shape. This spatial differentiation of thermal treatment resolves the contradiction between adhesion strength and foil flatness.
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 allows for reliable cutting of the foil and ensures an airtight seal by maintaining the outer edge of the tray foil flat, enhancing the rigidity and sealing integrity of the tray.
Implementation Method 1
heating a central zone of the tray foil
Implementation Method 2
The central zone of the tray foil is heated to above the softening temperature
Implementation Method 3
heating the sealing foil and the edge of the tray foil
Implementation Method 4
both foils will be heated such that the adhere to each other
Implementation Method 5
urging the heated central zone of the tray foil against the bottom, the upright wall and at least partially over the outwardly extending flange
Data Source
AI summary
Method for arranging a foil in a tray, comprising: - providing a tray (1) having a bottom, an upright wall, a tray opening and a circumferential outwardly extending flange composed out of at least two abutting portions; - providing a foil (7) having at least dimensions corresponding with the outer dimensions of the flange; - heating a central zone (15) of the foil; - urging the heated central zone of the foil against the bottom, the upright wall and at least partially over the flange, wherein the edge of the heated central zone runs over the interfaces of abutting portions. Intermediate product with a foil lying loose over a flange of the tray. Device comprising a mould (5) for receiving a tray (1), means for arranging a foil (7) over the mould, heating means comprising a plate which is arranged over the mould for heating the foil and means for urgin the foil in the mould.