Polysiloxane-Coated Insert Hose for Clean Resin Release
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Solution Overview
Problem
Existing insert hoses for trenchless sewer renovation face challenges with insufficient mechanical stability and separation effect against sticky resins, leading to potential tearing and residue issues during the removal process.
Innovation Solution
A liquid-tight multi-layer insert hose with a polysiloxane coating on the inner tube film, which reduces friction and enhances mechanical properties such as stretchability and puncture resistance, allowing for easy separation from hardened resin without leaving residue.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a multi-layer insert hose is used for trenchless sewer renovation, then mechanical stability is improved, but separation effect against sticky resins deteriorates
Solution Approach 1:
The patent applies a polysiloxane coating specifically to the outer surface of the inner tube film, creating a localized release layer with different properties than the bulk material. This allows the inner tube to maintain its mechanical strength while the coated surface provides excellent separation effect against sticky resins, resolving the contradiction between mechanical stability and ease of separation.
Solution Approach 2:
The patent creates a composite structure by coating the inner tube film with polysiloxane. The inner tube film provides mechanical stability while the polysiloxane coating provides release properties. This composite approach allows both requirements (mechanical strength and separation effect) to be satisfied simultaneously.
2Ease of operation
If the inner tube film is made thinner to reduce friction, then ease of insertion is improved, but mechanical strength deteriorates
Solution Approach 1:
The polysiloxane coating is applied only to the outer surface of the inner tube film that contacts the sliding film during insertion. This localized coating provides low friction properties without requiring the entire film to be thinner, thus maintaining mechanical strength while improving ease of insertion.
Solution Approach 2:
The polysiloxane coating acts as an intermediary layer between the inner tube film and the sliding film. It reduces friction during insertion while the underlying inner tube film maintains its mechanical strength, allowing the system to achieve both low friction and high strength without thinning the film.
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 coated inner tubular film exhibits improved mechanical strength, reduced friction, and excellent separation properties, preventing tearing and ensuring complete removal without residue, thus enhancing the trenchless sewer renovation process.
Implementation Method 1
The coated inner tubular film exhibits improved mechanical strength, reduced friction
Implementation Method 2
The inner film of the inflated liner is applied to the slip film, allowing the resin to cure—for example, using UV light from a UV light source slowly drawn through the interior of the inflated liner tube
Implementation Method 3
the preliner film also protects the inlets from excess resin penetrating the pipe, preventing resin plugs and blockages from forming. During the insertion process, a preliner performs a similar function to the sliding films described above for the pipe liner being inserted, reducing friction
Data Source
Figure 1~3
Figure 4~5
AI summary
Tubular film comprises at least one layer. At least one of the two outer sides of the tubular film at least regionally comprises a coating having at least one polysiloxane (4) and/or a coating and/or a configuration having at least one migrating compound. Independent claims are also included for: (1) an insert tube for trenchless sewer rehabilitation, comprising an external tubular film (5) which is liquid-tight, at least partially reflects and/or absorbs UV radiation and/or short-wavelength visible light, and is opaque or at least contact transparent, the internal tubular film (2), and a carrier material layer (4) arranged between these two films, which is impregnated with a reactive synthetic resin, where the coating and/or the configuration is placed on the outer side of the inner tubular film facing the substrate; and (2) coating the tubular film in flattened state, comprising unrolling the rolled tubular film before coating, rotating the rolled tubular film before or during introduction into a coating system, along its longitudinal axis or in circumferential direction by an angle which is not equal to 180[deg] , preferably 90[deg] , such that the edge present in the rolled state of the tubular film, is not present on the flattened tubular film in the two edge or edge regions, and are present on opposite spread surfaces of the tubular film, and coating in the coating system.