Sealed Container Flange Sealing with Protrusion Stamp
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Solution Overview
Problem
Existing sealed containers made from plastic laminated carton board face challenges in achieving airtight and moisture-tight seals due to overlapping double-layered flanges and potential tearing at corners, which complicates the sealing process.
Innovation Solution
The use of a stamp with local protrusions near each corner, including cylindrical protrusions across and on both sides of the step formed by the flange edge, and secondary line-shaped protrusions to distribute pressure evenly and prevent tearing, ensuring a reliable seal during the sealing process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If flange parts are folded outward to form a closed-circumferential flange, then the container structure is formed, but steps are created along the circumference making airtight sealing difficult
Solution Approach 1:
The stamp is designed with differentiated protrusions: main protrusions at corner steps and secondary line-shaped protrusions along the flange circumference. This local differentiation applies targeted pressure exactly where the step geometry creates sealing challenges, ensuring reliable seals without compromising the overall flange structure.
2Shape
If flange parts are folded outward at corners, then the container is formed, but the flange parts may be torn apart making corner sealing difficult
Solution Approach 1:
The main protrusions are positioned at the corner steps before the sealing process begins. These protrusions preemptively counteract the tearing force by concentrating pressure at the vulnerable corner regions during folding and sealing, preventing flange parts from tearing apart and ensuring corner integrity.
3Ease of manufacture
If uniform pressure is applied during sealing, then the sealing process is simple, but steps and corners are not adequately sealed
Solution Approach 1:
The stamp features localized protrusions that create non-uniform pressure distribution: main protrusions at corner steps and secondary line-shaped protrusions along the flange. This localized pressure enhancement ensures complete sealing at critical areas while maintaining overall process simplicity.
4Object-affected harmful factors
If plastic laminated carton board is used to reduce environmental burden, then environmental friendliness is improved, but the material cannot be plastically deformed requiring different production methods
Solution Approach 1:
The blank is divided into distinct functional zones: bottom part, side walls, corner connecting parts, and flange parts with folding lines. This segmentation allows the rigid plastic laminated carton board to be folded into the desired container shape without requiring plastic deformation, maintaining both environmental benefits and manufacturing feasibility.
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 method ensures a gas-tight and moisture-tight seal by distributing pressure across the steps and corners, preventing flange tearing and maintaining the integrity of the seal, even when using environmentally friendly plastic laminated carton board materials.
Implementation Method 1
the pressure on said sheet and said flange parts is higher across and on both sides of said step than in adjacent parts of said flange parts
Data Source
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AI summary
A method for producing a sealed container with a product to be preserved therein, wherein a tray is folded from a blank, wherein the blank comprises: a polygonal bottom part, side walls connected along folding lines with the sides of said bottom part, at each corner of said bottom part, two triangular corner connecting parts connected along folding lines with each other and two adjacent ones of said side walls, and flange parts connected along folding lines with each of said side walls and with at least one of each said two triangular corner connecting parts, wherein at least said flange parts have a plastic upper side, wherein said tray is folded by: folding said side walls in one direction relative to said bottom part, and at each corner of said bottom part, folding and fixing said two triangular corner connecting parts onto either the inner side or the outer side of one of the adjacent side walls, folding said flange parts outwardly such that a substantially flat closed-circumferential flange is formed at the upper side of the tray, wherein said tray is placed in a die with said product present in said tray, wherein a sheet is placed over the flange, and wherein a stamp is pressed against said sheet and said flange while the lower side of the flange abuts a counter press surface of the die, whereby said sheet is sealed against said flange, wherein said stamp is provided with local protrusions near each corner, wherein seen from above each of said protrusions extend across and on both sides of a step which is formed by the edge of a flange part which extends on top of the flange part below it, such that during sealing the pressure on said sheet and said flange parts is higher across and on both sides of said step than in adjacent parts of said flange parts.