Multilayered Polypropylene Pipe Structure for Barrier and Weldability
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Multilayered pipes with both reinforcement and barrier properties face issues with deteriorated welding and mechanical properties due to the addition of barrier layers, which can make them more brittle and reduce longevity.
Innovation Solution
A multilayered pipe design incorporating a polyamide barrier layer and a mineral fiber-reinforced layer, where the barrier layer can coincide with or be separate from the reinforcement layer, maintaining stiffness and durability while preventing brittleness, and allowing for effective welding without peeling off outer parts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a barrier layer is added to a multilayered pipe with reinforcement layer, then the barrier effect is improved, but the welding properties and mechanical properties deteriorate
Solution Approach 1:
An adhesive layer is introduced as an intermediary between the barrier layer and the reinforcement layer. This adhesive layer prevents direct contact between the barrier layer and polypropylene during welding, eliminating the harmful mixing effect while maintaining strong bonding between layers. The adhesive layer acts as a protective mediator that preserves welding properties despite the presence of the barrier layer.
Solution Approach 2:
The pipe structure is segmented into distinct functional layers: inner basis layer, reinforcement layer, adhesive layer, barrier layer, and outer layer. This segmentation allows each layer to perform its specific function independently, with the adhesive layer specifically dedicated to protecting the barrier layer's integrity during welding operations.
2Strength
If the reinforcement layer is thickened to maintain homogeneity and temperature resistance, then the pipe's strength is improved, but the pipe becomes more brittle
Solution Approach 1:
The reinforcement is distributed locally across multiple layers rather than concentrated in a single thick layer. The reinforcement layer and barrier layer are positioned at specific locations (inner and outer respectively), with the adhesive layer providing local bonding. This distributed local quality approach maintains temperature resistance while reducing overall brittleness compared to a single thick reinforcement layer.
3Object-affected harmful factors
If a barrier layer is added to the multilayered pipe, then the barrier effect is improved, but the pipe's longevity is reduced
Solution Approach 1:
The adhesive layer serves as a protective intermediary that prevents direct interaction between the barrier layer and polypropylene during welding. This mediation preserves the barrier layer's integrity and prevents degradation, thereby maintaining the pipe's longevity despite the presence of the barrier layer.
Solution Approach 2:
The adhesive layer is positioned beforehand between the barrier layer and reinforcement layer to cushion and protect the barrier layer from potential damage during subsequent welding operations. This prior protective measure prevents harmful effects before they can occur, preserving the pipe's long-term durability.
Data Source
AI summary
The present invention concerns a multilayered pipe comprising an inner basis layer (1) and an outer layer (2), the inner basis layer (1) and the outer layer (2) comprising polypropylene, and with a reinforcement layer (3, 6) reinforced with mineral fibers and located between the inner basis layer (1) and the outer layer (2), wherein at least one layer of the pipe located between the inner basis layer (1) and the outer layer (2) is a barrier layer (3) comprising polyamide.