Thermoplastic Welding Device Preheating and Holding Mechanism
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Solution Overview
Problem
Existing welding devices for thermoplastic layers face challenges in alignment and moisture issues, particularly in tunnel construction and civil engineering, where large, unwieldy plastic sheets need to be aligned and clamped vertically, and high humidity affects welding quality due to trapped moisture.
Innovation Solution
A welding device with a preheating device for contactless preheating of plastic layers to evaporate contaminants before the heating process, and a holding device to secure the welding device to one plastic layer, allowing single-operator alignment and operation, even in vertical positions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If contact heating is used to evaporate moisture from thermoplastic layers, then moisture content is reduced, but evaporated moisture cannot escape in time due to lack of space, degrading weld quality
Solution Approach 1:
The patent introduces a preheating device that performs preliminary heating and moisture evaporation before the main welding heating process. By pre-evaporating moisture from the thermoplastic layers before they are clamped between heating surfaces, the system prevents water vapor from being trapped during welding, thereby maintaining high weld quality without compromising moisture removal effectiveness.
2Ease of operation
If two pressure rollers are used to clamp and align welding device with plastic layers, then joining pressure is applied, but alignment of three objects (two plastic layers and welding device) requires at least two assistants
Solution Approach 1:
The patent incorporates a holding device with holding elements that can be moved between a release position and a holding position. When in the holding position, these elements secure the welding device to one of the plastic layers, enabling the device to self-align and self-secure during operation. This allows a single operator to perform alignment and clamping tasks that previously required multiple assistants, significantly improving ease of operation while managing device complexity through automated positioning mechanisms.
3Adaptability or versatility
If welding device is positioned vertically for tunnel construction, then welding can be performed on vertical walls, but alignment and handling becomes more difficult
Solution Approach 1:
The patent employs a holding device with movable holding elements that can dynamically adjust between release and holding positions. This dynamic mechanism allows the welding device to be easily positioned and secured in vertical orientations during tunnel construction. The holding elements can be moved into engagement with the plastic layer to prevent the welding device from sliding down under gravity, making vertical operation as manageable as horizontal operation and thereby improving ease of operation in vertical positions while maintaining adaptability to different construction geometries.
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
Improves welding quality by allowing efficient evaporation of moisture and simplifies the alignment and clamping process, enabling single-operator operation in challenging environments like tunnel construction.
Implementation Method 1
designed for contactless preheating of the plastic layer, by which contaminants, in particular liquids, can be evaporated
Implementation Method 2
the welding device is designed to heat the plastic layer by contact heat transfer between the at least one heating surface and the plastic layers
Data Source
Figure 1
Figure 2a~2b
Figure 3
AI summary
Welding device for welding thermoplastic layers (2), comprising: - a heating device (3) with at least one heating surface (4, 5), wherein the welding device (1) is designed to heat the plastic layers (2) by contact heat transfer between the at least one heating surface (4, 5) and the plastic layers (2), - a joining device (6), preferably with at least two pressure rollers (7, 8), wherein the joining device (6) is designed to exert a pressure force on the plastic layers (2) for joining the plastic layers (2), wherein a preheating device (10) is provided in front of the heating device (3) with respect to a feed direction (9), which is designed for contactless preheating of the plastic layers (2).