Multilayer Pipe Bending via Localized Dielectric Heating
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Solution Overview
Problem
Multilayer plastic pipes with aggregates face issues where desired properties, such as barrier properties and bending shape retention, are compromised during dielectric heating due to overheating and inadequate thermal energy distribution.
Innovation Solution
Incorporating a solid semiconductor or nonconductor aggregate with a higher absorption factor in specific layers to control dielectric heating, ensuring balanced heat absorption and retention of material properties by adjusting the absorption factors and conversion temperatures of the plastics and aggregate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If dielectric heating is applied to achieve pipe bending, then the pipe becomes soft and bendable, but the barrier property of barrier layers partially or entirely diminishes due to overheating
Solution Approach 1:
The patent applies local quality by distributing different aggregates with specific dielectric properties to different layers of the multilayer pipe. Each layer receives an aggregate tailored to its specific heating requirements, allowing localized control of heat absorption during dielectric heating. This prevents overheating of barrier layers while ensuring sufficient softening of bending layers, thus resolving the contradiction between bendability and barrier property retention.
Solution Approach 2:
The patent changes the dielectric parameters (absorption factor, permittivity) of different layers by incorporating aggregates with specific properties. By adjusting the aggregate type and concentration in each layer, the heating behavior during dielectric processing is precisely controlled. This parameter adjustment allows the barrier layer to maintain its protective properties while bending layers achieve necessary softening, resolving the overheating issue.
2Ease of operation
If dielectric heating is applied to achieve pipe bending, then the pipe becomes soft and bendable, but the pipe does not retain its bending shape after heating
Solution Approach 1:
The patent implements local quality by assigning different aggregates to different layers based on their functional requirements. Bending layers are equipped with aggregates that provide sufficient dielectric heating for softening and shape retention, while barrier layers use aggregates that minimize heating to preserve structural integrity. This localized differentiation ensures both bendability during processing and shape stability after cooling.
Solution Approach 2:
The patent uses composite materials by combining plastics with various aggregates (such as metal oxides, ceramics, or other dielectric particles) to create multilayer structures with tailored dielectric properties. Each composite layer contributes specific characteristics: some layers enhance dielectric heating for bending, while others maintain thermal stability for shape retention. This composite approach resolves the contradiction between achieving bendability and maintaining post-heating shape stability.
3Use of energy by moving object
If aggregates are added to achieve dielectric heating, then heating efficiency increases, but the pipe loses specific desired properties due to overheating
Solution Approach 1:
The patent applies local quality by selectively adding aggregates with high dielectric loss factors only to layers that require heating for bending. Barrier layers and other heat-sensitive layers either receive no aggregate or receive aggregates with lower dielectric loss factors. This localized aggregate distribution maintains high overall heating efficiency while preventing overheating of specific layers, thus preserving material properties.
Solution Approach 2:
The patent changes the dielectric parameters of the pipe structure by incorporating aggregates with controlled absorption factors and permittivity values. By carefully selecting aggregate types and concentrations for each layer, the heating efficiency is optimized for bending operations while the thermal exposure of heat-sensitive materials is controlled. This parameter optimization resolves the contradiction between heating efficiency and material property retention.
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 effectively maintains the pipe's bending shape and barrier properties post-heating by confining heating to dielectric absorption, preventing overheating and ensuring uniform softening of layers for efficient bending deformation.
Implementation Method 1
aggregate Z facilitates the dielectric heating of the first layer and the pipe
Implementation Method 2
an absorption factor AZ is allocated to aggregate Z, wherein an absorption factor AK1 is allocated to the first plastic K1, wherein the absorption factor AZ is larger than the absorption factor AK1
Data Source
AI summary
A pipe (1) comprises at least one first layer (3) and one second layer (2), wherein the first layer (3) has a first plastic K1, wherein the first plastic K1 has a conversion temperature TUK1. The second layer (2) comprises a second plastic K2, wherein the second plastic K2 has a conversion temperature TUK2. The first layer (3) has an aggregate Z, wherein aggregate Z is not a polymer or copolymer. Aggregate Z is preferably a solid, wherein the solid is a semiconductor or nonconductor Aggregate Z facilitates the dielectric heating of the pipe.