Determination and Calibration of Carton Ring Pressing Strength Instrument

Cut 12.7 mm wide and 152 mm long specimens with a special cutter and insert them in the longitudinal and transverse directions, respectively. The specimen opening is facing forward. Half of the specimen is inserted inwards and half of the specimen is facing inwards. Adjust the pointer at zero.

Start the motor to make the upper platen evenly drop and compress the sample so that the edge of the sample is crushed. After the pointer no longer moves, lift the upper platen and record the maximum bending deformation of the spring plate ( the value of the dial indicator ) . The force required to crush the specimen from the stress-strain curve of the spring plate was found to be accurate to 1N .

In each packaging unit, 10 horizontal and vertical samples were taken from different paper samples taken and measured, and the results of the measurement were reported on the arithmetic mean, maximum, and minimum values ​​of all the measured values ​​in the vertical and horizontal directions.

The calculation is rounded off to 1N .

Ring Crush Tester Instrument Calibration

Non-parallel alignment of the upper and lower plate: placing a thickness of 0.5 ~ 0.8mm cardboard cut in standard sizes in the sample holder, a test start the instrument, i.e., when the spring plate is deformed to become stopped when 0.5mm, an inner diameter measured vertically dial indicator The 4- point distance difference of the trigger is the non-parallel degree of the sample under pressure, and the error does not exceed 0.5mm . Then continue to start, so that the upper platen down to 0.5mm stop, measure the degree of non-parallelism, so measured three times, continuous measurement of five samples, 15 times the measurement results, determine the absolute degree of non-parallel changes in the upper and lower plate Value, ( test time available 50kg spring plate ) .

Place the spring plate on a special bracket, place the lower plate and the sample plate on the plate girder, adjust the dial indicator to zero point, place the static pressure measuring head on the sample seat, and apply static pressure. Different pressure values ​​will be Corresponding flexural deformation is reflected on the dial gauge, so that a linear relationship diagram of force deformation is drawn, and the allowable difference is less than 0.01 mm, so as to correct the correctness of the force measurement value of the spring plate.

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