Dynamic Sealing Time Control for Vacuum Packaging Machines
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Solution Overview
Problem
The existing vacuum packaging machines rely on user-set sealing times, which can be inappropriate due to variations in the sealing bar's temperature, leading to inconsistent sealing, overexertion, and deterioration of machine components.
Innovation Solution
A method that calculates the sealing time based on the time elapsed since the last packaging using a mathematical function, adjusting it within predefined maximum and minimum limits to optimize the sealing process and maintain consistent temperature conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a fixed user-set sealing time is used, then the sealing process is simple to operate, but the sealing quality becomes inconsistent due to temperature variations of the sealing bar
Solution Approach 1:
The sealing time is transformed from a fixed static value to a dynamic value that automatically adjusts based on the thermal state of the sealing bar. The control system continuously monitors temperature and modifies the sealing time parameter in real-time, allowing the system to adapt to changing conditions without requiring manual intervention or complex user settings.
Solution Approach 2:
A feedback loop is implemented where the temperature of the sealing bar is continuously measured and used to adjust the sealing time. The control system receives temperature data, processes it through a mathematical function, and automatically modifies the sealing duration to maintain optimal sealing conditions, ensuring consistent quality regardless of initial temperature variations.
2Manufacturing precision
If a longer sealing time is used to ensure proper sealing, then sealing quality improves, but the sealing bar undergoes overexertion and deterioration
Solution Approach 1:
The sealing time parameter is dynamically adjusted based on the actual temperature of the sealing bar rather than using a fixed conservative value. When the bar is already hot, the system reduces sealing time; when cooler, it increases sealing time appropriately. This optimized parameter adjustment achieves quality sealing while minimizing excessive thermal exposure and mechanical stress on the sealing bar.
Solution Approach 2:
Instead of always applying a excessively long sealing time to guarantee sealing quality, the system applies only the necessary amount of sealing time required for the current thermal conditions. This partial action approach avoids the harmful effects of overexertion while still achieving adequate sealing quality.
3Productivity
If the sealing bar temperature is allowed to vary, then the sealing process is faster, but the sealing consistency deteriorates
Solution Approach 1:
The system embraces temperature variations rather than attempting to maintain a constant temperature, dynamically adjusting the sealing time parameter to compensate for thermal fluctuations. This allows the sealing process to proceed at optimal speed for each thermal condition while maintaining consistent sealing quality through real-time parameter adaptation.
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 ensures independent operation, optimizes sealing time, achieves more homogeneous seals, extends the life of sealing bars, reduces maintenance costs, and prevents overheating or incomplete sealing.
Implementation Method 1
the packaging machine extracts, by means of a vacuum pump, the air from the chamber
Implementation Method 2
The bar has nichrome resistance that increases its temperature while the current passes through it
Implementation Method 3
transmitting the heat that it generates, melts the plastic of the bag, sealing it
Data Source
Figure 1
Figure 2
AI summary
The method comprises the steps of determining the time elapsed since the last vacuum packaging in the machine; calculating a sealing time as a function of said time; comparing said sealing time with a maximum sealing time and a minimum sealing time; applying said calculated sealing time if it is less than said maximum sealing time and greater than said minimum sealing time, or apply said maximum sealing time if the sealing time is greater than the maximum sealing time, or apply said minimum sealing time if the sealing time is less than the minimum sealing time; and continuing the vacuum packaging process by applying the sealing time of the application step. It makes it possible to provide a sealing time adjusted to the temperature conditions of the bar and therefore optimizing the total time of each cycle.