Test methods for water absorption on various paper or cardboard surfaces

KBY-1 paper water absorption tester This instrument is designed according to the basic parameters and requirements specified in GB/T1540-2002 "Determination Method for Determining the
Water Absorption of Paper and Cardboard (Cobo Method)".
This standard is suitable for the determination of water absorption on various paper or cardboard surfaces
.
However, it is not suitable for accurate evaluation of the writing performance
of paper or cardboard.
Technical indicators: the internal cross-sectional area of the metal cylinder is 100±0.
2cm2 (the corresponding inner diameter is 112.
8±0.
2mm), the height of the cylinder is 50mm, and the contact part between the torus of the cylinder and the sample should be smooth
.
The amount of absorbent paper is 200~250g/㎡, and its absorption speed is 75mm/10min
.
When the single-layer quantitative amount of absorbent paper is less than 200~250 g/㎡, it can be superimposed with multiple layers to meet the requirements
.
Smooth metal flat roller: the length of the roller is 200±0.
5mm, and the mass should be 10±0.
5kg
.
Test water consumption: 100mm±5ml
.
Operation of the Kebo absorbency tester: 1.
Prepare the sample: cut the sample into 10 round specimens with a diameter of 125mm (5 on the front and back sides) to ensure the test area
of 100cm2 each.
2.
Place the sample: Before placing the sample, ensure that the cylinder torus in contact with the
sample is dry.
Take 100mL of distilled water with a glass graduated cylinder and pour it into the cylinder, and then place the weighed round specimen on the annular surface of the cylinder, the measured surface faces in the direction of water (downward), and cover the specimen gland on the specimen to fix it with the cylinder, and tighten
it with a compression nut.
Gently pull out the spring cylindrical pin, shake the shaker to turn the cylinder 180°, and then insert the spring cylindrical pin into the slot while timing
at the same time.
3.
Water absorption time: Water absorption time refers to the time
from the beginning of contact between water and the sample to the end of water absorption.
At this time, the Cobleau absorbency tester can be selected according to the different water absorption properties of paper and cardboard, and corresponds
to the lower surface.
The time may be extended or shortened if necessary, but this should be noted
in the test report.
At the end of water absorption for 10-15s, gently pull out the spring cylinder pin again, shake the shaker to turn the cylinder 180°, and turn the cylinder right
.
National standard: GB/T1540 Label: paper water absorption tester