Protective Pipe Jacket with Multilayer Diffusion Barrier Film
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Solution Overview
Problem
Plastic pipes lack sufficient diffusion or permeation tightness against undesired substances, requiring additional diffusion barriers like aluminum foil, which are costly and require careful handling to avoid damage.
Innovation Solution
A multi-layer composite film with a metal foil layer and/or plastic film with diffusion-inhibiting properties is used between plastic layers, allowing for thin layers and cost-effective production, with varying adhesion properties depending on layer sequences and orientation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If aluminum foil is used as a diffusion barrier, then diffusion tightness is improved, but material consumption and cost increase
Solution Approach 1:
The patent applies composite materials by combining multiple plastic layers (PE-RT, PP-R, PA6) in a multilayer structure to achieve diffusion barrier functionality without requiring thick aluminum foil. The composite structure leverages the complementary properties of each material: PE-RT for flexibility and stress crack resistance, PP-R for dimensional stability, and PA6 for gas barrier properties, thereby reducing aluminum consumption while maintaining diffusion tightness.
Solution Approach 2:
The patent changes the material parameters by transitioning from a single-material aluminum foil barrier to a multilayer plastic composite with specific thickness parameters (e.g., 2.0-4.0 mm total wall thickness with distributed layers). This parameter optimization allows achieving the required diffusion resistance through controlled thickness and layer composition rather than relying on thick metal foil.
2Reliability
If aluminum foil is used as a diffusion barrier, then diffusion tightness is improved, but handling difficulty increases due to bending radius constraints
Solution Approach 1:
The patent employs flexible shells by using thin-walled multilayer plastic construction (2.0-4.0 mm total thickness) that inherently provides flexibility and bendability. The combination of PE-RT (known for flexibility) with other layers creates a structure that can be bent to smaller radii without compromising the integrity of the diffusion barrier, eliminating the handling constraints associated with rigid aluminum foil.
Solution Approach 2:
The multilayer composite structure combines materials with different mechanical properties to achieve both diffusion tightness and flexibility. The PE-RT layer provides elongation and bendability, while the PA6 layer contributes to gas barrier properties, creating a composite that is both flexible for easy handling and effective as a diffusion barrier.
3Reliability
If PVDF protective coating is applied, then diffusion tightness is improved, but device complexity and manufacturing cost increase
Solution Approach 1:
The patent simplifies the device structure by integrating the diffusion barrier functionality directly into the pipe wall through a multilayer composite construction rather than adding separate PVDF coating layers. The multilayer structure (PE-RT/PP-R/PA6) is manufactured as an integrated component, reducing structural complexity compared to multi-layer coatings with adhesion promoters and separate protective jackets.
Solution Approach 2:
The multilayer pipe wall structure serves multiple functions simultaneously: it provides structural integrity, acts as the diffusion barrier, and eliminates the need for separate protective coatings. The PA6 layer specifically provides gas barrier properties while the overall structure maintains mechanical strength, combining multiple functions in a single integrated component.
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 solution provides a cost-effective diffusion barrier with improved adhesion and mechanical strength, allowing for smaller bending radii without risk of damage, while maintaining good diffusion tightness and nominal diameter.
Implementation Method 1
The individual layers of the multilayer composite film are laminated with an adhesion promoter
Implementation Method 2
A multi-layer composite film with a metal foil layer and/or plastic film with diffusion-inhibiting properties is used between plastic layers
Data Source
AI summary
The invention relates to a protective jacket pipe with a diffusion barrier and a core pipe made of a plastic material, as well as an extruded protective jacket. The invention aims to create a protective jacket pipe with good diffusion tightness that can be manufactured particularly cost-effectively and in which a high degree of variability with regard to the layer structure and adhesion to the core pipe or the protective jacket, or to other layers surrounding the core pipe, is ensured. This is achieved by designing the diffusion barrier between the core pipe and the protective jacket as a multilayer composite film with at least one metal foil layer and/or at least one plastic film with diffusion-inhibiting properties between different plastic layers, which can consist, for example, of polyethylene, polypropylene, polypropylene copolymer, polyamide, or other suitable thermoplastic materials.