Inductor Segmentation for Multi-Lane Packaging Sealing
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Solution Overview
Problem
Conventional sealing devices for packaging machines struggle to simultaneously heat working elements on multiple lanes efficiently and reliably, leading to temperature fluctuations and reduced efficiency, especially when handling small-sized articles like bouillon cubes.
Innovation Solution
A sealing device with separate inductive heating systems for each article track, utilizing individual conductor loops and flux guide devices to ensure symmetrical and uniform heating, minimizing energy losses and temperature deviations, and using ferromagnetic stainless steel for the sealing units to prevent corrosion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single central inductor is used to heat sealing units on multiple article tracks, then the device complexity is reduced, but temperature uniformity deteriorates causing inner grippers to become significantly warmer than outer ones
Solution Approach 1:
The single central inductor is divided into multiple separate conductor loops, with each loop assigned to a specific article track. This segmentation ensures that each sealing unit on each track receives uniform magnetic field distribution, eliminating the temperature gradient that occurred with the central inductor configuration.
2Device complexity
If heating cartridges are used for sealing, then the structure is simple, but energy efficiency deteriorates due to unnecessary energy losses
Solution Approach 1:
The contact-based heating cartridges are replaced with an inductive heating system using conductor loops. This substitution eliminates direct thermal contact and reduces energy losses through conduction and radiation, achieving higher energy efficiency while maintaining structural simplicity.
3Device complexity
If multiple sealing units are heated by a single inductor, then the device complexity is reduced, but reliability deteriorates due to temperature fluctuations beyond permissible ranges
Solution Approach 1:
The heating control is segmented by assigning separate conductor loops to each article track and sealing unit. This allows independent temperature control for each sealing unit, maintaining reliability by keeping temperature fluctuations within permissible ranges while managing multiple tracks.
Solution Approach 2:
Each conductor loop is optimized for its specific article track, providing localized heating control. This ensures that each sealing unit receives the precise energy input required for its position, maintaining consistent sealing quality across all tracks.
4Ease of manufacture
If heating cartridges are used, then ease of manufacture is improved, but productivity deteriorates due to inability to achieve high-speed simultaneous sealing on multiple lanes
Solution Approach 1:
The heating cartridges are replaced with inductive heating conductor loops that can be integrated into the sealing units. This enables simultaneous heating of multiple sealing units across multiple lanes through electromagnetic induction, achieving high-speed sealing while maintaining ease of manufacture through standardized components.
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 solution enables high-speed, reliable sealing of small-sized articles across multiple lanes with improved efficiency, maintaining temperature control within a narrow range and reducing energy losses, while preventing corrosion and ensuring consistent magnetic field distribution.
Implementation Method 1
The inductor, usually an electrical copper conductor, is subjected to a high-frequency alternating current by a generator. This alternating current generates a magnetic field that changes over time
Implementation Method 2
The heating in the sealing unit then results from eddy currents which are induced in the surface of the sealing unit by the time-varying magnetic field
Implementation Method 3
eddy currents which are induced in the surface of the sealing unit by the time-varying magnetic field (frequency dependence) and are converted into heat due to the electrical resistance of the material of the sealing unit
Implementation Method 4
This alternating current generates a magnetic field that changes over time, which forms approximately in a ring shape around the individual conductors and decreases sharply (B is proportional to 1/r) with increasing distance from the conductor
Data Source
Figure 1
Figure 2~3
Figure 4
AI summary
The present invention relates to a sealing device for a packaging machine for packaging small items on parallel product webs. In order to seal the items simultaneously during transport on parallel product webs in continuous operation with higher operating speed and higher reliability, the sealing device (1) according to the invention comprises at least one inductor (2) and at least one sealing unit (3) for each product web (B1, B2), which can be inductively heated by the inductor (2) in order to seal a packaging material associated with one of the items conveyed on the product web (B1, B2), wherein the inductor (2) has at least one separate conductor loop (21, 22) for each product web (B1, B2).