Overview
The LABO LB-K100 Cobb Absorbency Tester is used to test the Water Absorbency of adhesive paper, which directly affects writing and printing results and material Appearance characteristics. The instrument evaluates Water Absorbency by measuring the increase in mass per unit area (g/m2) of the sample after contact with water for a specified time, which can be adjusted according to the water absorption capacity of the paper and Cardboard.
Features
1. The seat-type reversable structure is convenient and safe to use.
2. The main components are made of stainless steel.
Principle
The instrument starts the timing by placing the test surface of the sample down on the annular surface of the cylinder and fixing it, and turning the cylinder to make the sample contact with water. After the water absorption is over, turn the cylinder to remove the sample, suck up the excess water with absorbent paper and metal pressure roller, and then weigh it. The result is expressed in terms of the increased mass of the sample per unit area.
Applications
Water Absorbency Test of Adhesive Paper
Standards
GB/T1540、ISO535、QB/T1668、TAPPI T441
Steps
1. Use the sampling equipment to evenly cut the standard sample (125 +/- 5mm square or φ 125 +/- 5mm round).
2. Take 100ml of water with measuringflask and pour it into the cylinder.
3. Place the sample test face down on the annular surface of the cylinder, cover and clamp.
4. Flip the cylinder 180 ° and turn on the stopwatch at the same time.
5. 10s to 15s before the end of water absorption, turn the cylinder upright, release the lid and remove the sample.
6. At the moment of reaching the specified water absorption time, place the water absorption face down on the paved absorbent paper, and then place a piece of absorbent paper.
7. Immediately use a metal pressing roller to press back and forth within 4s without force to absorb the remaining water.
8. Weigh the sample and measure the arithmetic mean of each of the five measurement results on both sides.
Notice
- The cylinder surface and rubber pad in contact with the sample should be dried.
Hands should not touch the test area.
The sample should be discarded during testing when the cylinder seeps or the non-test area comes into contact with water.
