Any packaging material made of paper or pulp tends to absorb water. This reduces the strength of the packaging and also affects the packaged contents. In this regard, before using any material for packaging, it is important to check its water absorption and holding capacity. The COBB value is determined to evaluate the water absorption of the material. The test involves examining the amount of water absorbed by non-adhesive paper with a thickness of 0.1 mm over a period of time. The COBB value is the difference between the weight of the sample after testing and the weight of the sample before starting the test.
The COBB sizing tester determines the amount of water absorbed by paper, cardboard, corrugated board or paperboard in a given time under standard conditions. The sizing, porosity and similar various properties of paper are evaluated by its water absorbency. If the COBB value is high, the substrate has the ability to absorb and retain moisture. If the COBB value is low, it is understood that the substrate is resisting the penetration and retention of moisture. The COBB value should be maintained according to the paper or cardboard requirement.
The COBB sizing tester is used to check the water resistance of a box and measures the weight gain of the sample when exposed to water for a specified period of time. Paper and fiberboard attract and retain water molecules from the surrounding environment because these materials are hygroscopic. Water absorption is the main characteristic of various papers such as porosity. The COBB test is important because it tests the paper's ability to penetrate water and the amount of water absorbed by the cardboard surface evaluates the quality of the paper over a period of time. The instrument is the most suitable test method for performing corrugated board testing, paper testing and tissue testing. The correct COBB value helps the manufacturer use the right materials for packaging before supplying it to consumers.
Briefly, water absorbency (COBB value) is the mass of water that a 1 square meter sample of paper, cardboard or corrugated cardboard absorbs at a certain time under the conditions specified in standards such as TAPPI T 441.
Our organization also provides COBB dimensioning test services with its trained and expert staff and advanced technological equipment, among the numerous test, measurement, analysis and evaluation studies it provides for businesses in various sectors.
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