Shrink-Wrapping Heating Zone Control for Voltage Stability
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Solution Overview
Problem
Shrinking devices in the beverage industry experience high switching frequencies and voltage fluctuations due to high-power additional heating devices, leading to mechanical stress and mains faults, such as flicker effects.
Innovation Solution
A method and device that dynamically adjust the number of active heating devices based on actual temperature and operating parameters, switching from a basic heating mode with multiple devices to an additional mode with one extra device to maintain target temperature, reducing switching frequency and voltage fluctuations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If high-power additional heating devices are used to quickly reach target temperature, then heating speed is improved, but switching frequency increases causing voltage fluctuations and mechanical stress
Solution Approach 1:
The heating device is segmented into multiple independent heating elements (first additional heating device, second additional heating device, etc.) that can be operated separately. This allows the control unit to distribute the heating load across multiple elements rather than switching a single high-power element on and off frequently, thereby reducing switching frequency and voltage fluctuations while maintaining heating speed.
Solution Approach 2:
The system dynamically adjusts the operating state of heating elements based on real-time temperature feedback. The control unit monitors the actual temperature and dynamically switches between different heating configurations (e.g., using both additional heating devices, using only one, or using neither) to optimize heating performance while minimizing switching operations and electrical network stress.
2Measurement precision
If additional heating devices are frequently switched on and off to maintain target temperature, then temperature control precision is improved, but mechanical stress on heating elements increases
Solution Approach 1:
By dividing the heating system into multiple independent heating elements, the control unit can make finer-grained adjustments to heating output. Instead of frequently switching a single high-power element, the system can gradually adjust temperature by selectively activating or deactivating individual elements, thereby maintaining temperature precision while reducing mechanical stress from frequent switching.
Solution Approach 2:
The control unit implements a regulated switching strategy where additional heating devices are not switched on and off continuously, but rather in a more periodic and controlled manner based on temperature thresholds and heating phase. This reduces the frequency of switching operations and associated mechanical stress while still achieving the required temperature control precision.
3Speed
If high switching frequency is used to respond to temperature changes, then temperature regulation responsiveness is improved, but mains voltage fluctuations increase causing flicker effects
Solution Approach 1:
The heating load is segmented across multiple heating elements, allowing the control unit to achieve rapid temperature regulation by selectively activating elements rather than frequently switching a single high-power element. This segmentation enables responsive temperature control while distributing the electrical load to minimize voltage fluctuations and flicker effects on the mains network.
Solution Approach 2:
The control unit merges the heating output of multiple additional heating devices to achieve the required temperature regulation. By combining the output of multiple lower-power elements rather than relying on a single high-power element, the system maintains responsiveness while reducing the amplitude of individual switching events and their impact on mains voltage.
4Device complexity
If base heating load is provided by a single heating element, then device simplicity is improved, but thermal load on the element increases causing frequent switching
Solution Approach 1:
The base heating load function is segmented across multiple heating elements (first additional heating device, second additional heating device, etc.) rather than relying on a single element. This segmentation distributes the thermal load, reducing the stress on individual elements and their associated switching operations, thereby improving reliability while maintaining relatively simple device architecture.
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 reduces the frequency of heating device switching and voltage fluctuations, minimizing thermal loads and electrical network stress, while maintaining efficient temperature control, thereby enhancing energy efficiency and reducing mechanical stress on heating devices.
Implementation Method 1
The heat within the shrinking unit can be generated, for example, by electric heating devices
Implementation Method 2
each packaging group is transformed into a solid or fixed packaging unit or container by shrinking the shrink film under the influence of heat
Data Source
Figure 1~2
Figure 3~4
Figure 5
AI summary
The invention relates to a method for operating an apparatus (1) for heat-shrinking a sheet-like material onto a group of individual packs, having at least one heating zone (I, II) with a plurality of electrical heating devices (HR), wherein the method comprises the following method steps: - sensing the actual temperature in the region of the heating zone (I, II) and comparing the actual temperature (IT) in the region of the heating zone (I, II) with a desired temperature (ST); - switching into a first operating mode by reducing the number of active heating devices (HR) in the heating zone (I, II) to a predefined number of heating devices (HR) when the actual temperature (IT) in the region of the heating zone (I, II) has exceeded the desired temperature (ST), wherein the predefined number of heating devices (HR) was determined taking at least one operating parameter into consideration; and - switching from the first operating mode into a second operating mode by increasing the number of active heating devices (HR) in the heating zone (I, II) in order to increase the actual temperature (IT) in the region of the heating zone (I, II) to the desired temperature (ST).