Conductive Face Shield for High Voltage Headgear
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Solution Overview
Problem
Existing shielding garments for high voltage and electromagnetic fields are inadequate due to high electrical resistance, rigidity, discomfort, and degradation of conductive properties, failing to meet evolving safety standards and providing insufficient protection at high voltage levels.
Innovation Solution
A headgear with a transparent, electrically conductive face shield made of metallized aramid fiber fabric, integrated with a hood and visor, providing improved electrical conductivity, comfort, and reduced electromagnetic wave reflection, forming a continuous Faraday cage effective up to 1000 kV AC and 800 kV DC.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If stainless steel yarns are used in shielding garments, then electrical conductivity is improved, but rigidity increases making garments uncomfortable and hindering operator movement
Solution Approach 1:
The patent changes the material parameters by replacing stainless steel yarns with copper-coated or silver-coated polyester or nylon yarns. This material substitution reduces rigidity while maintaining electrical conductivity, resolving the contradiction between reliability (conductivity) and ease of operation (movement freedom).
Solution Approach 2:
The patent uses composite yarns consisting of a polymeric core (polyester or nylon) coated with conductive metal layers (copper or silver). This composite structure combines the flexibility of polymers with the conductivity of metals, simultaneously achieving both electrical reliability and operational comfort.
2Reliability
If stainless steel yarns are used in shielding garments, then electrical conductivity is improved, but electrical resistance between points remains high requiring considerable current to trigger conductivity
Solution Approach 1:
The patent changes the material composition from stainless steel to copper or silver coatings on polymeric yarns. Copper and silver have inherently lower electrical resistance than stainless steel, reducing the energy required to establish conductivity and eliminate the need for high triggering currents.
3Reliability
If rigid visors are used in shielding garments, then shielding protection is improved, but operator comfort and movement freedom are reduced
Solution Approach 1:
The patent replaces rigid visors with flexible face shields made from conductive fabric. This flexible shielding material maintains electrical continuity and shielding effectiveness while allowing operator movement and improving comfort, resolving the contradiction between protection reliability and operational ease.
4Ease of manufacture
If conventional shielding garments are washed, then hygiene is improved, but conductive properties degrade
Solution Approach 1:
The patent uses composite yarns with polymeric cores and metal coatings that are more wash-resistant than stainless steel constructions. The coated yarn structure protects the conductive metal layers during washing, maintaining electrical properties while enabling hygiene maintenance.
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
Enhances shielding protection and operator safety by ensuring effective electrical shielding, comfort, and visibility at high voltage levels, meeting stringent safety standards while reducing electromagnetic wave reflection.
Implementation Method 1
a continuous cover is formed, which creates a substantially perfect Faraday cage
Implementation Method 2
a transparent face shield made of an electrically conductive fabric, the fabric comprising a plurality of yarns... each of the plurality of yarns comprises a core externally covered with a coating made of a conductive metal
Data Source
AI summary
Headgear for a shielding garment for operating on components exposed to high voltage, or for operating at a safe distance proximate to high voltage parts, or for activities involving exposure to high electric and/or electromagnetic fields at any frequency and voltage is disclosed. The headgear comprises a cover element which is configured to cover the head of an operator and has an opening at least at an upper portion of the operator's face. The headgear further comprises a transparent face shield made of an electrically conductive fabric. The face shield is removably coupled to the cover element to close the opening and is electrically connected to the shielding garment. The fabric has a density ranging from 25 to 40 g/m2 and comprises a plurality of yarns having a yarn count ranging from 10 to 30 deniers, and each comprising a respective core externally covered with a coating made of a conductive metal.