Sealing Machine Discrete Heating Zones for Thermal Yield
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Solution Overview
Problem
Existing sealing machines for paper products wrapped in plastic or paper films suffer from energy inefficiencies and heat wastage, particularly due to non-uniform heat distribution and irreversible resistor coupling, leading to increased operational costs and reduced thermal yield.
Innovation Solution
A sealing machine with a feed channel and multiple sealing bands, each equipped with a resistor element and a control unit, allows for discrete heating based on package height, reducing energy waste by optimizing thermal yield and enabling flexible operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a single-piece rectangular sealing plate with a cylindrical electrical resistor is used, then the structure is simple and easy to manufacture, but the heat distribution is non-uniform and heat transfer efficiency is reduced due to clearance between the resistor and plate
Solution Approach 1:
The sealing plate is divided into multiple independent heating zones, each with its own resistor element. This allows different regions of the plate to have different thermal characteristics, enabling uniform heat distribution across the entire sealing surface while maintaining manufacturing simplicity through modular construction.
Solution Approach 2:
The single-piece sealing plate with one large cylindrical resistor is segmented into multiple smaller heating zones with individual resistor elements. This segmentation eliminates the clearance problem between the resistor and plate by using multiple contact points, improving heat transfer efficiency while keeping the overall structure simple and manufacturable.
2Reliability
If the electrical resistor is inserted into a blind hole in the sealing plate, then the resistor is secured in place, but the coupling is essentially irreversible and replacement is expensive
Solution Approach 1:
The resistor elements are designed to be movable and replaceable rather than permanently fixed. This dynamic design allows resistors to be easily removed and replaced when worn or failed, significantly improving ease of repair while maintaining reliable positioning during operation through simple mechanical retention features.
Solution Approach 2:
The resistor elements are designed as disposable or replaceable components that can be easily discarded and replaced. This approach makes maintenance cost-effective by allowing quick replacement of worn resistors without expensive repair operations, while the simple retention mechanism ensures reliable positioning during use.
3Power
If the sealing plate heats along the area affected by the cylindrical electrical resistor, then the resistor heating area is concentrated, but the side bands remain cooler and heat distribution is non-uniform
Solution Approach 1:
The heating function is segmented into multiple independent resistor elements distributed across the sealing plate. Each resistor heats its local zone, and the combination of multiple distributed heating zones achieves uniform heat distribution across the entire plate, eliminating the non-uniform temperature fields caused by a single concentrated cylindrical resistor.
Solution Approach 2:
Different regions of the sealing plate are equipped with their own resistor elements, giving each local zone its own heating capability. This local quality approach ensures that heat is generated uniformly across the entire sealing surface, preventing cooler side bands and achieving consistent temperature distribution.
4Reliability
If the sealing plate transfers heat to areas of the machine not involved in sealing packages, then the sealing function is maintained, but serious energy inefficiencies occur and components not suitable for high temperatures are heated
Solution Approach 1:
The heating function is segmented into discrete, localized resistor elements positioned only at the sealing zones. This segmentation prevents heat transfer to adjacent machine components not involved in sealing, as each resistor only heats its immediate local area, maintaining sealing reliability while eliminating energy waste and protecting temperature-sensitive 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
The proposed solution achieves optimal thermal yield by heating packages in a discretized manner, reducing energy waste, and allowing for flexible operation, making it easier to manufacture, assemble, and maintain.
Implementation Method 1
for each sealing band, at least one resistor element adapted to heat the sealing band
Data Source
Figure 1
Figure 2
Figure 3~6
AI summary
A sealing machine for sealing packages of products wrapped in films provided with at least one heat-sealable part, the sealing machine comprising - a feed channel for the products wrapped in films; - on at least one side of the feed channel, at least two sealing bands, specifically a lower sealing band and an upper sealing band arranged at a greater height than the lower sealing band, both extending parallel to the feeding direction of the products in the feed channel, - for each sealing band, at least one resistor element adapted to heat the sealing band, - a control unit operationally connected to the resistor elements, adapted to enable power supply of the resistor elements of the sealing bands, so as to heat a single band or several bands simultaneously depending on the height of the sealing face to be obtained.