Paper and cardboard thickness measuring instrument is an indispensable common instrument for enterprises and departments such as cardboard, carton production, scientific research and commodity inspection. It is a special instrument for measuring the thickness of paper and cardboard. Its main technical indicators and performance parameters are in accordance with GB451•3 “paper and cardboardâ€. The relevant provisions of the "Measurement of Thickness" can be widely applied to the thickness measurement of paper, cardboard and other sheet materials, and therefore, also referred to as paper and cardboard thickness gauges.
Jinan Sanquan Middle Stone Paper and Cardboard Thickness Measuring Instrument CHY-U adopts the contact test principle to intercept a certain size sample. The thickness gauge measuring head automatically falls on the sample and is tested by fixed pressure and fixed contact area. The thickness value of the sample.
Paper and paperboard thickness measurement experiments can be divided into single layer thickness measurement, laminate thickness measurement, and banner thickness difference according to the number of layers of paper. The paper and paperboard thickness measuring instrument are described below:
1. Measurement of single layer thickness Five samples were folded in the longitudinal direction to form 10 layers. Then two sets of 1/100 m2 samples were cut in the transverse direction for a total of 20 samples. The thickness value of each sample is measured by a thickness meter. Each sample should be measured for one point. If the single layer tightness is measured, the mass of 20 samples is weighed by the balance and calculated according to GB/T451.2. .
2. Measurement of Laminated Thickness 40 samples were cut out from the five samples taken, and each of 10 stacks was stacked face up to prepare a stack of four samples. The thickness values ​​of the four stacks of samples were measured by a thickness gauge, and three points were measured for each stack. If the layer tightness is measured, the mass of 40 samples is weighed using a balance and quantified according to GB/T 451.2.
3. Measurement of the difference in thickness of the banner A single sheet of paper is randomly selected, and not less than six specimens are uniformly cut along the transverse web, and the thickness of each specimen is measured by a thickness gauge. Three points were measured for each piece of the sample, and the average value was taken as the measurement result of the piece of the sample.
4. The measurement process first adjusts the instrument zero point and places the sample between the open measuring faces. Slowly move the other measuring surface to the specimen at a speed of less than 3 mm/s during the test, taking care to avoid any impact. After the indicated value is stable, but should be read before the paper is "indented", the reading is usually completed within (2 ~ 5) s, and any pressure should be artificially applied to the thickness gauge.
The method for measuring the thickness of paper and paperboard is simple. In the course of the experiment, it should be strictly in accordance with the requirements of GB/T451.3 paper and paperboard thickness measurement method.
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