Offset Bulge Pressure Rollers for Food Package Sealing
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Solution Overview
Problem
Automated packaging machines often trap air during transverse sealing of food packages, leading to weakened seals due to the traditional use of annular bulges on pressure rollers, which do not effectively remove air from the sealing process.
Innovation Solution
A pressure unit with rotatable pressure and anvil rollers featuring offset annular bulges around their rims, designed to apply varying pressure and direct trapped air away from the package, ensuring a stronger seal by removing air from the sealing process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If traditional annular bulges are used on pressure rollers, then sealing pressure is applied, but air is trapped in the sealing process
Solution Approach 1:
The patent applies asymmetry by offsetting the annular bulges of successive pressure rollers along the axial direction. Instead of all rollers having bulges at the same position, each roller's bulge is axially displaced relative to the previous one. This asymmetric arrangement creates a progressive pressure application pattern that pushes trapped air outward from the sealing zone, resolving the contradiction between applying sealing pressure and preventing air entrapment.
Solution Approach 2:
The patent implements dynamics by making the pressure application pattern variable along the sealing path. The offset bulges create a dynamic pressure distribution that evolves as material passes through successive rollers, transitioning from uniform pressure to progressive directional pressure. This dynamic approach allows the system to adapt the pressure distribution to actively expel air while maintaining sealing effectiveness.
2Object-generated harmful factors
If multiple pressure rollers with offset bulges are used, then air removal is improved, but device complexity increases
Solution Approach 1:
The patent applies local quality by concentrating the air-removal function in specific localized features (the offset annular bulges) rather than redesigning the entire roller system. Each roller maintains a simple cylindrical form with a localized bulge feature, keeping individual component complexity low while achieving the overall air removal objective through the coordinated arrangement of these simple local features.
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 offset bulges on the rollers effectively remove most trapped air, resulting in a more secure seal by applying extra pressure and directing air movement to prevent air from entering the package, thereby enhancing the sealing process.
Implementation Method 1
The first pressure roller comprises a first bulge extending and annularly around its rim surface, and the second pressure roller comprises a second bulge extending annularly around its rim surface. The first bulge is offset in relation to the second bulge in an axial direction of the first pressure roller and the second pressure roller.
Data Source
AI summary
The invention relates to a pressure unit (1) for sealing a package (2) for a food product, comprising a conveyor (3) for transporting the package (2) through the pressure unit (1) in a travelling direction (d), a first rotatable pressure roller (11) and a first rotatable anvil roller (21). The first pressure roller (11) is arranged opposite to the first anvil roller (21) to form a first nip (4) for receiving and rotationally engage with a portion (5) of the package, and arranged downstream of the first pressure roller (11) and the first anvil roller (21) in the travelling direction, a second rotatable pressure roller (12) and a second rotatable anvil roller (22). The second pressure roller (12) is arranged opposite to the second anvil roller (22) to form a second nip (6) for receiving and rotationally engage with the portion (5) of the package. The first anvil roller (21) and the second anvil roller (22), respectively, has a smooth rim surface (25). The first pressure roller (11) comprises a first bulge (15) extending annularly around its rim surface (18), the second pressure roller (12) comprises a second bulge (16) extending annularly around its rim surface (19), and the first bulge (15) is offset in relation to the second bulge (16) in an axial direction (7) of said first pressure roller (11) and the second pressure roller (12).