Manufacturing method of Foil type strain gauge

Abstract

The invention discloses a foil type strain gauge and a manufacturing method thereof. A macromolecular engineering plastic film is served as a substrate; a sensitive grid is firmly glued to a film substrate layer through a gluing layer; and a sealing layer is arranged on the surface of the sensitive grid. The manufacturing method comprises the following steps: performing plasma or corona treatment on one surface of the film substrate and then treating the surface by using a coupling reagent; coating epoxy resin or phenolic aldehyde-epoxy resin on the surface of the film substrate or one surface of a sensitive grid blank; gluing and curing the film substrate and the sensitive grid blank; processing the sensitive grid blank into the sensitive grid; and lastly, gluing the sealing layer on the surface of the sensitive grid. According to the manufacturing method provided by the invention, the problems of the substrate of high difficulty in processing, unequal and uneven thickness, and the like, are solved, and the working efficiency is increased; the peel strength between the sensitive grid and the substrate is increased; the sealing layer has an excellent function for protecting the sensitive grid; and various aspects of the strain gauge, such as moisture and thermal resistance, creep deformation, resetting consistency, and the like, are obviously improved.

Description

technical field [0001] The invention relates to a strain gauge and a manufacturing method thereof, in particular to a foil strain gauge and a manufacturing method thereof. Background technique [0002] At present, the known foil-type resistance strain gauge is to directly coat the polymer liquid resin insulating material on the surface of the rolled-formed metal foil, form a polymer insulating substrate after drying, and then use photolithography and etching on the metal foil. The technology makes the metal foil material form a sensitive grid, and then forms a welding terminal at the rear end of the sensitive grid. The defects of this method are: the production process is backward, the efficiency is low, the thickness of the substrate is difficult to control, the thickness of each substrate in the same batch is uneven, the thickness deviation between different batches is relatively large, and some maximum deviation More than 30%. The strain gauge produced by this method is...

AI Technical Summary

Problems solved by technology

The disadvantages of this method are: the production process is backward, the efficiency is low, the thickness of the substrate is difficult to control, the thickness of each substrate in the same batch is uneven, the thickness deviation between different batches is relatively large, and some maximum deviations more than 30%

The strain gauges produced by this method are prone to creep, return to zero scattered and unstable, and are sensitive to humidity and temperature changes, which may easily cause changes in the resistance of the strain gauge and zero signal; the substrate is relatively brittle and easy to break

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