Seal Bar Temperature Sensor Positioning for Accurate Detection
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Solution Overview
Problem
Conventional temperature control methods for sealing surfaces in packaging machines are inaccurate due to temperature differences caused by sealing conditions, structure of the seal bar, and ambient factors, making it difficult to achieve a satisfactory sealing state.
Innovation Solution
A seal bar design where the temperature sensor is positioned between the center line and an auxiliary line, parallel to the sealing surface, with a distance of 5 mm or less from the surface and a diameter less than 3 mm, allowing the detected temperature to accurately reflect the actual sealing surface temperature without being affected by sealing conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the temperature sensor is provided on the sealing surface to directly detect the temperature, then the temperature detection accuracy is improved, but the smoothness of the sealing surface is lowered
Solution Approach 1:
The temperature sensor is extracted from the sealing surface and repositioned to the side surface of the seal bar. This allows the sealing surface to remain smooth and free of sensor attachments, while the sensor still detects temperature through thermal conduction from the seal bar body, resolving the contradiction between detection accuracy and surface smoothness.
Solution Approach 2:
The seal bar body acts as an intermediary between the heating element and the temperature sensor. The sensor detects temperature on the side surface, and this temperature information is transmitted through the thermally conductive seal bar material to represent the sealing surface temperature, eliminating the need for direct sensor contact with the sealing surface.
2Shape
If the temperature sensor is inserted into the inside of the seal bar from a side crossing the short side of the sealing surface, then the sealing surface smoothness is maintained, but the temperature detection accuracy is reduced due to offset from the sealing surface
Solution Approach 1:
The temperature sensor is positioned at a specific location on the side surface of the seal bar - specifically at the center in the width direction and within a specific distance range (5-50mm) from the sealing surface in the length direction. This localized positioning optimizes the thermal conduction path to accurately represent the sealing surface temperature while maintaining surface smoothness.
3Shape
If the temperature is detected at a position different from that on the sealing surface, then the sealing surface smoothness is maintained, but the temperature control accuracy is reduced due to temperature differences caused by sealing conditions
Solution Approach 1:
The invention optimizes specific parameters of the temperature sensor positioning: the distance from the sealing surface (5-50mm) and the lateral position (center in width direction). By carefully controlling these parameters, the sensor detects temperature that accurately reflects the sealing surface conditions despite being positioned elsewhere, maintaining both surface smoothness and control accuracy.
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 configuration enables precise temperature control of the sealing surface, reducing temperature differences and ensuring accurate detection and reflection of temperature changes, thereby improving the sealing process.
Implementation Method 1
a heater (13) and a temperature sensor (14) are provided inside the main body (11)
Implementation Method 2
the temperature detected by the temperature sensor can easily correspond to an actual temperature of the sealing surface
Data Source
Figure 1
Figure 2~3(B)
Figure 4~5
AI summary
A technique for accurately detecting a temperature of a sealing surface which is not affected by sealing conditions or the like is provided. A seal bar (1) is a rod-shaped seal bar having a sealing surface (11a) and includes a heater (13) and a temperature sensor (14). The heater (13) is provided in a main body of the seal bar (1) and extends in an extending direction (D1) of the main body (11). The temperature sensor (14) is provided at a position between the sealing surface (11a) and the heater (13) in the main body (11) of the seal bar (1) and is inserted into the main body (11) of the seal bar (1) from an end surface (upper end surface (112) or the like) which intersects a long side of the sealing surface (11a).