Paper smoothness test method

The paper smoothness meter is a smart paper and paperboard smoothness performance testing instrument based on the internationally accepted working principle of the Bekk smoothing instrument. What is the specific test method for the paper smoothness meter? Kunshan Haida instrument technicians explain in detail for you:

1. Sample preparation

According to the provisions of GB/T450 sampling. On the sheet of paper that is drawn, the test specimens shall be taken uniformly at 15 mm from the edge of the banner and tested 10 times on the front and back sides. The area of ​​the test specimen shall be at least 60 mm×60 mm, and no pleats, wrinkles or visible marks shall be visible on the specimen. Cracks or other paper diseases. If there is a watermark, try to avoid it when testing.

2. Samples should be treated with temperature and humidity according to GB/T10739 and tested under the same atmospheric conditions.

3. Experimental procedure

1 Before testing smoothness, calibrate the instrument if necessary.

2 When testing, place the measuring surface of the specimen against the glass plate, place the pad and the upper platen on the sample, apply (100±2) kPa pressure, and generate a vacuum of 50.66 kPa in a large vacuum container. . Measure and record the time required to reduce the vacuum from 50.66 kPa to 48.00 kPa in seconds. If the time exceeds 300s. Use a small volume and retest with another sample. If the time is less than 15 s, the additional sample is used to test the time required for the vacuum to drop from 50.66 kPa to 29.33 kPa. The time from the start of the loading of the specimen to the time shall be approximately 60 seconds.

3 If you want to test the smoothness of the other side, apply another 10 samples for testing.

4 Calculation and Expression of Test Results

The smoothness of each side of the specimen shall be the arithmetic average of 10 measurements, expressed in seconds. And calculate the coefficient of variation of the test results. If a large vacuum container is used, the smoothness is the average of the measured values; if a small vacuum container is used, the smoothness is the average of the measured values ​​multiplied by 10; if the vacuum is reduced from 50.66 kPa to 29.33 kPa, the smoothness is Divided by the average of the measured value by 10.