Sewer Liner Edge Welding Homogeneity
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Solution Overview
Problem
Existing liner tubes for sewer rehabilitation face challenges in continuous production, accurate manufacturing, and ensuring a strong, inseparable connection between the inner film tube and reinforcement layer, which affects durability and surface homogeneity.
Innovation Solution
The development of a liner tube with an inner film tube produced by connecting edge sections of a film web with a fleece layer, where the fleece layer extends to the longitudinal edges and is thermally welded with a film strip, creating a mechanically strong and homogeneous surface that remains connected to the reinforcement layer after curing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the fleece layer is removed in the area of longitudinal edges to facilitate welding, then the welding process becomes easier, but the connection between the inner film tube and reinforcement layer becomes weaker and less homogeneous
Solution Approach 1:
The fleece layer is extended to the longitudinal edges in advance before welding, ensuring that the fleece is already in position to provide mechanical interlocking with the reinforcement layer. This preliminary positioning eliminates the need to remove the fleece during assembly, maintaining both manufacturing ease and connection strength.
Solution Approach 2:
The fleece layer acts as an intermediary element between the inner film tube and the reinforcement layer. By extending it to the edges and welding it in place, it serves as a bonding medium that mechanically interlocks with both components, ensuring strong and homogeneous connection without requiring removal for welding.
2Reliability
If the inner film tube is made with a laminated fleece layer and overlapping edges, then the protective function is improved, but the surface homogeneity deteriorates and resin layer detachment risk increases
Solution Approach 1:
The fleece layer is extended uniformly to the longitudinal edges and welded to create a homogeneous surface structure. This eliminates the non-homogeneous overlapping areas that previously existed, ensuring consistent surface properties throughout the inner film tube while maintaining the protective function.
Solution Approach 2:
The welded fleece layer serves as a continuous intermediary between the inner film tube and reinforcement layer, creating a homogeneous bonding interface that prevents resin layer detachment while maintaining surface uniformity throughout the structure.
3Productivity
If the fleece layer is extended to the longitudinal edges and thermally welded, then the manufacturing complexity increases, but the continuous production capability and manufacturing precision are improved
Solution Approach 1:
The fleece layer is extended continuously to the longitudinal edges and welded in a continuous process, enabling uninterrupted production of the inner film tube. This continuous action eliminates the need for separate operations to handle edge preparations, improving productivity despite the added welding step.
Solution Approach 2:
The extension and welding of the fleece layer to the longitudinal edges are merged into a single integrated process step. This combines multiple functions (edge preparation, fleece positioning, and welding) into one operation, reducing overall process complexity while enabling continuous production.
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 solution results in a liner tube with improved surface homogeneity, reduced risk of resin layer detachment, enhanced flow behavior, and reduced risk of blockages, allowing for easier installation and disposal, while maintaining high mechanical strength and protecting the reinforcement layer during flushing.
Implementation Method 1
a film strip thermally welded to the film web is arranged on the side of the film web opposite the fleece layer
Implementation Method 2
which after the pulling the liner tube into the pipeline and expanding it with the aid of compressed air is cured by light from a radiation source
Data Source
Figure 1
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Figure 3
AI summary
A lining tube for rehabilitating sewers and effluent lines, with an inner film tube (2), which is produced by joining the edge portions (4a, 4b) of at least one film web (6), which has on its outer side a nonwoven layer (8), and with a reinforcing layer (10), which is arranged on the nonwoven layer (8) and comprises a roving (10) impregnated with a light-curable reactive resin and wound in particular in a helical form, is distinguished by the fact that the nonwoven layer (8) extends in the edge portions (4a, 4b) up to the respective longitudinal edge (6a, 6b) of the film web (6), that the edge regions (4a, 4b) of the film web (6) are placed one over the other in an overlapping region (12) with a width (B) of 0.1 to 10 mm, in particular 0.5 to 2 mm, and that arranged on the side (14) of the film web (6) opposite from the nonwoven layer (8) is a film strip (16) that is thermally welded to the film web and covers the overlapping region (12). The invention also relates to a method and an arrangement for producing such a lining tube.