Gypsum board surface water absorption measurement

                                   Gypsum board surface water absorption measurement

Summary of a water absorption apparatus, plaster surface

Plaster surface water absorption apparatus can Bob absorbent tester is based on GBT gypsum board, 9775-2008 rule of basic parameters and requirements. This standard applies to the determination of all kinds of paper or cardboard on the surface of the water. But is not suitable for accurate evaluation of paper or paperboard writing performance.

Paper and cardboard surface water quantity (Cobb) value: per unit area of paper and cardboard under certain pressure and temperature, absorbed by the surface of the water, within the time required in g / ㎡.

The specific formula is as follows: C = (G2 - G1) by 100.

Type:

C - to cuny water absorption value;

G2 - said that the sample quality after water absorption

G1 - said that the sample quality before water absorption.

Paper and cardboard absorbent paper and board tester is surface water imbibition experiment equipments, also called paper surface absorption weight tester. This instrument USES the absorption test of a variety of methods can (Cobb) test method, therefore, also known as Bob absorption apparatus.
Second, the plaster surface water absorption apparatus technology parameters:

1. The metal cylinder cross-sectional area is 100 + / - 0.2 ㎝ (corresponding diameter was 112.8 + / - 0.2 mm), drum up to 50 mm, cylinder ring surface contact with the sample parts should be smooth.

2. The blotting paper quantitative for 200 ~ 250 g / ㎡, the absorption rate of 75 mm / 10 min. When water absorbent single-layer quantitative less than 200 ~ 250 g / ㎡, you can use multiple layers to meet the requirements.

3. The test of water: 100 mm + / - 5 ml.

4. The size and weight: size: 250 * 300 * 420 (mm), weight: 15 kg