Self-adhesive thermal indicator

A self-adhesive temperature indicator with a flexible design and thin petal structure ensures secure attachment and accurate overheating detection on small-diameter wires, addressing peeling issues in existing indicators.

WO2026142470A1PCT designated stage Publication Date: 2026-07-02LLC TERMOELEKTRICA
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Patent Information

Authority / Receiving Office
WO · WO
Patent Type
Applications
Current Assignee / Owner
LLC TERMOELEKTRICA
Filing Date
2025-12-23
Publication Date
2026-07-02

AI Technical Summary

Technical Problem

Existing temperature indicators for electrical equipment, particularly those with small diameters, tend to peel off due to their thickness and flexibility issues, leading to inaccurate and unreliable overheating detection.

Method used

A self-adhesive temperature indicator with a flexible polymer film, irreversible temperature-sensitive element, and protective layer, designed to securely attach to wires up to 6 mm thick, with a thickness of no more than 200 µm and a flexible petal structure to ensure secure fixation and accurate temperature monitoring.

Benefits of technology

The solution provides reliable, fast, and accurate overheating detection on small-diameter wires by maintaining a tight seal and flexible attachment, enhancing the safety and reliability of electrical installations.

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Abstract

The utility model relates to devices for thermal indicator-based monitoring, and more particularly to a self-adhesive thermal indicator with thin tabs for installation on a wire of up to 6 mm in diameter. A self-adhesive thermal indicator for visually indicating that a threshold temperature has been exceeded comprises: a flexible polymer film having a layer of pressure-sensitive adhesive applied to the rear side thereof; and, attached to the front surface of the flexible polymer film, an irreversible thermal sensitive element which has an area that is not greater than 50% of the area of the flexible polymer film and which is covered on top by a protective layer. The thickness of the flexible polymer film without the adhesive layer is not more than 75 µm, the total thickness of the flexible polymer film, the thermal sensitive element and the protective layer is not more than 200 µm, and the thermal sensitive element is situated in the centre part of the flexible polymer film. The utility model provides for increased operational reliability and safety of electrical equipment as a result of the timely detection of heat-induced faults in wires by ensuring that the adhesive label is reliably affixed and that the thermal sensitive element lies snuggly against the wire throughout the entire service life thereof, which in turn allows accurate, fast and reliable temperature monitoring.
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