Film thickness determination of films and flkn films by micrometer

The structure of the simple and widely used micrometer (Fig. 97) is as follows: a horseshoe gauge 1, one end of which is tightly fixed on the measuring surface 2, and the other end is fixed by a twisted sleeve in which the micrometer thread 3 can be moved. Briefly; one end of the helix 3 is the second measuring surface, the thread 6 can be used to compensate the wear of the thread, and the nut 4 can be used to fix the micrometer wire when the micrometer is adjusted to a certain size. Ratchet point 8 creates constant pressure under the micrometric thread.

When the screw rotates fully (full rotation), the stroke can be measured on the scale of the horseshoe gauge 1, while the stroke when the screw turns less than one turn can be measured on the rotating wheel 5 installed on the medium by means of the dimension body. measured on the scale.

If the zero degree of the rotating wheel 5 does not coincide with the starting point on the scale of the gauge 1 when the two measuring surfaces are in contact, the measuring gauge must be adjusted to zero. Fix the micrometer line, loosen the amplitude difference 71 for one to two turns, and then turn the micrometer and the line-dimensional body. At the same time, adjust it again while paying attention to the coincidence of the scale machine, and then twist Tighten the cap 7, unscrew the screw 4 to forcibly check the coincidence of the scale machine.

When measuring the thickness of the coating film, it is easy to use the measuring scale indicator (Figure 98). In order to determine the thickness of the coating film, first measure the total thickness of the coating film together with the test panel (white iron, broken glass, etc.).

After that, peel off the paint film carefully and measure the thickness of the test panel in situ, and the difference between the two measurements is the thickness of the removed film. (Related instrument: Coating Thickness Gauge)

In order to obtain accurate results, it is necessary to measure the thickness at 5~10 points, and take the arithmetic mean value from the obtained data. Micrometer to measure the diameter of a flat surface) template of thick paper bell flowers. The thickness of the coating film is generally expressed in microns.

The thickness of the peeled paint film can be determined by direct measurement.