Geopolymer Cable Wrapping for Continuous Fire-Resistant Production
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Solution Overview
Problem
Existing methods for manufacturing fire-resistant cables using geopolymer compositions are lengthy, difficult to industrialize, and prone to contamination, with drying steps that are not continuous and hardening issues affecting mechanical properties and durability.
Innovation Solution
A method involving impregnating a non-woven fibrous material with a geopolymer composition, drying it, and then applying it around elongated electrically conducting elements to form a composite layer, using a coating process and controlled temperature to ensure quick, continuous, and contamination-free production.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If geopolymer composition is applied directly to form composite layer, then fire resistance is achieved, but contamination of cable constituent elements occurs
Solution Approach 1:
The process is segmented into three distinct steps: (i) impregnating non-woven fibrous material with geopolymer composition to form an impregnated tape, (ii) drying the impregnated tape to form a dried impregnated tape, and (iii) applying the dried impregnated tape around the cable. This segmentation prevents direct contact between liquid geopolymer composition and cable constituent elements, eliminating contamination while maintaining fire resistance.
Solution Approach 2:
The non-woven fibrous material acts as an intermediary carrier. The geopolymer composition is first impregnated into the fibrous material, then dried, and finally applied as a pre-formed dried impregnated tape. This intermediary approach allows the geopolymer to be delivered to the cable without direct application of the liquid composition, preventing contamination.
2Productivity
If traditional continuous drying method is used, then production efficiency is improved, but uniform drying and prevention of hardening are difficult to achieve
Solution Approach 1:
The drying process is separated from the composite layer formation process. The non-woven fibrous material is impregnated and dried in step (i) to form a dried impregnated tape before being applied in step (iii). This segmentation allows controlled drying of the tape in advance, ensuring uniform moisture removal without causing premature hardening, while enabling continuous production.
Solution Approach 2:
The impregnated tape is dried in advance before application to the cable. This preliminary drying action ensures uniform moisture distribution and prevents hardening issues that would occur if drying were attempted after cable assembly, while maintaining production efficiency through pre-processing.
3Quantity of substance
If geopolymer composition is applied in liquid form, then impregnation is effective, but hardening issues occur near the composite layer
Solution Approach 1:
The geopolymer composition is impregnated into the non-woven fibrous material and then dried in advance to form a dried impregnated tape. This preliminary action allows the geopolymer to be delivered in a stable, dry state to the cable, preventing premature hardening near the composite layer while ensuring effective distribution throughout the fibrous material structure.
Solution Approach 2:
The physical state of the geopolymer composition is changed from liquid to dry solid through the drying step. The composition is impregnated in liquid form for effective distribution, then dried to change its state to stable solid form for application, preventing hardening issues while maintaining effective impregnation.
4Ease of operation
If manual application method is used, then flexibility is maintained, but production speed is reduced
Solution Approach 1:
The dried impregnated tape is prepared in advance as a ready-to-apply component. This preliminary preparation allows the tape to be stored and then applied efficiently using automated equipment, combining the flexibility of pre-formed tapes with the speed of automated application processes.
Solution Approach 2:
The dried impregnated tape serves as an intermediary product that bridges manual flexibility and automated efficiency. The tape can be handled flexibly during application while enabling continuous, high-speed production through automated feeding and wrapping systems.
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 method results in a fire-resistant cable with improved mechanical properties, flexibility, and durability, while avoiding contamination and enabling continuous production, thus being economical and easy to implement on an industrial scale.
Implementation Method 1
impregnating a non-woven fibrous material with a geopolymer composition
Implementation Method 2
drying the impregnated tape obtained in step i)
Data Source
AI summary
A method of manufacturing a cable includes at least one elongated electrically conducting element and at least one composite layer surrounding the elongated electrically conducting element. The composite layer is obtained from at least one step of impregnation of a non-woven fibrous material with a geopolymer composition.