Dry Film Thickness Gauge Measurement Principle and Precision Requirement

From:Linshang Time:2019/10/26 13:52:00 Browse:97
Membranes are mainly divided into dry and wet films. Different dry film thickness gauges have different measurement principles and measurement methods. The measuring principle of the dry film thickness gauge includes mechanical method, gravimetric method, magnetic method, etc.The precision requirements are different for each measurement method.

     Dry film thickness gauges are no stranger to many people and they are one type of coating thickness gauge. We believe that many people's conceptual boundaries between dry and wet films are not very clear. So what is the dry film and what is the wet film? What is the measurement principle of the dry film thickness gauge? Here we come to find out
    1.Distinction between dry film and wet film:
    The thickness of the paint film can be mainly divided into dry film thickness and wet film thickness and the dry film is a polymer compound. After being irradiated by ultraviolet rays, a polymerization reaction is formed to produce a stable substance attached to the material, thereby achieving the functions of blocking corrosion, weathering and electroplating. A wet film is a photosensitive ink that is sensitive to ultraviolet light.This ink can be cured by ultraviolet light.The most common dry and wet films around us are PCB dry film and wet film, both of which can be used as raw materials for circuit boards.
    The thickness of the film, wet film thickness, dry film thickness are clearly defined in the "Determination of film thickness of paints and varnishes"ISO 2808:2007.The dry film thickness is simply the thickness of the coating remaining on the surface after the coating has hardened.

dry film thickness gauge

    2.Dry film thickness gauge measurement principle and precision requirements:
    ● The measurement principle of the dry film thickness gauge first has a mechanical method.
    ● The measurement methods are:
    ● Thickness difference method (side indicator / dial gauge).The precision requires a mechanical bottom limit of 5 μm and an electronic lower limit of
    ● Depth gauge (side indicator / dial gauge). The precision requires a mechanical bottom limit of 3 μm and an electronic lower limit of 2 μm.
    ● Surface contour scanning. Precision requires a low limit of 2μm.
    2)The gravimetric analysis method is also one of the measurement principles of the dry film thickness gauge.
    Measurement method: mass difference method.
    3)Dry film thickness gauge optical method.
    ● The measurement methods are:
    ● Section method. The precision required error is ±2 μm and the reproducibility is ±5%.
    ● The cut method. The precision requires an upper limit of 2 μm and a reproducibility of ±10%.
   4)Dry film thickness gauge magnetic method.
    ● Measurement methods:
    ● The magnetic attraction is released from the tester.The precision required error is ±5 μm and the reproducibility is ±6%.
    ● Magnetic flux tester. The precision required error is ±3 μm and the reproducibility is ±5%.
    ● Inductive magnetic tester. The precision required error is ±2 μm and the reproducibility is ±3%.
    ● Eddy current tester. The precision required error is ±2 μm and the reproducibility is ±3%.
     5)Dry film thickness gauge radiation method.
     Measurement method: backscattering method.The precision requirement error is ±2% or plus or minus 0.5μm.
    6)Dry film thickness gauge photothermal method.
    Measurement method: thermal performance method. There is no specific requirement for precision.
    7)Dry film thickness gauge acoustic wave method.
    Measuring method: ultrasonic thickness gauge. The precision required error is ±2 μm and the reproducibility is ±5%.
    3.Linshang dry film thickness gauge.

LS221 dry film thickness gauge

    The Linshang dry film thickness gauges mainly include LS220, LS220B, LS221, LS223, LS220H. These dry film thickness gauges mainly use magnetic thickness measurement and eddy current thickness measurement.That is, it is suitable for the measurement of non-magnetic dry film on a ferromagnetic metal substrate such as steel. It is also suitable for the measurement of non-conductive coatings and anodized layers on non-magnetic metal substrates. The measurement accuracy of the instrument is ≤±(3% reading +2μm).In line with the national "Determination of film thickness of paints and varnishes" ISO 2808:2007,the national standard of IDT.

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