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Introduction to COBB-01 Cardboard Water Absorption Tester
The COBB-01 Cardboard Water Absorption Tester is a precision instrument specifically designed to assess the water absorption capacity of paper and cardboard using the Cobb method. This tester is essential for determining the water absorption properties of various materials used in packaging, printing, and industrial applications. It plays a critical role in evaluating whether paperboard and cardboard meet required standards for moisture resistance, which is crucial for industries where moisture can affect product quality, such as food, beverage, pharmaceutical, and packaging sectors.
The Cardboard Water Absorption Tester is ideal for testing the water resistance of cardboard surfaces, particularly for high-surface materials like paperboard. However, it is not suitable for testing low-weight basic paper (below 50g/m²) or materials with extensive pinholes and low sizing degrees. Furthermore, it does not provide reliable results for unsized paper and embossed paper. Despite these limitations, the tester remains an indispensable tool for ensuring cardboard quality across many industries.
Understanding the Cobb Test
The Cobb test is a globally recognized method for measuring the water absorption rate of paper and cardboard. It determines how much water a surface can absorb over a specific period under controlled conditions. The result is expressed in grams per square meter (g/m²), representing the mass of water absorbed by the surface. The Cobb value is a crucial metric in industries that rely on paper and cardboard packaging, as it influences the material’s durability, print quality, and overall performance.
The Cardboard Water Absorption Tester follows international standards to perform these tests accurately. It offers flexibility in testing times to suit different materials, with recommended test durations ranging from 30 seconds to 1800 seconds. The longer the duration, the higher the precision in measuring water absorption for materials with various thicknesses and compositions.
COBB Test Time Recommendations
The following table provides the recommended times for water absorption and excess water removal during Cobb testing:
| Mark | Time to Remove Excess Water (S) | Time to Finish Absorbing Water (S) |
|---|---|---|
| cobb30 | 20±1 | 30±1 |
| cobb60 | 45±1 | 60±2 |
| cobb120 | 105±2 | 120±2 |
| cobb300 | 285±2 | 300±2 |
| cobb1800 | 1755～1815 | After removal of excess water 15±2 |
The test duration impacts the precision of the water absorption measurement, making it crucial for industries where even slight variations in water absorption can significantly affect the final product quality.
COBB Sample Cutter for Accurate Testing
An integral part of the Cardboard Water Absorption Tester is the COBB sample cutter, which accurately prepares test samples. The cutter swiftly produces circular samples with a diameter of Ø125mm, ensuring uniformity and precision. This stamping-type sample cutter is vital for producing consistent test results, especially in industries like corrugated board and carton production, research and development, and quality control inspections.
Why Do You Need a COBB Tester?
For industries involved in packaging, printing, and product protection, the Cardboard Water Absorption Tester is indispensable. Understanding the Cobb value helps manufacturers optimize paper and cardboard composition, ensuring that their products maintain moisture resistance, which is critical for preventing ink smudging, packaging failure, and product degradation.
Water absorption testing also aids in quality control, helping companies ensure that their products meet regulatory and industry standards. This is especially important in sectors like food packaging, pharmaceuticals, and consumer goods, where cardboard or paper packaging must maintain its integrity under various environmental conditions.
Advantages of the COBB-01 Cardboard Water Absorption Tester
The COBB-01 Cardboard Water Absorption Tester is a reliable and durable instrument, built to deliver precise results. Some of its key advantages include:
Test Principle of the COBB-01 Cardboard Water Absorption Tester
The principle behind the Cardboard Water Absorption Tester is straightforward yet highly effective. First, a sample is weighed before being exposed to water on one side for a specified period. After the exposure, the sample’s excess moisture is removed, and the sample is weighed again. The increase in weight (mass gain) per unit area, expressed in grams per square meter (g/m²), indicates the water absorption capacity of the tested material.
This method allows manufacturers and researchers to determine the water resistance of cardboard and paper surfaces, which is crucial in industries like packaging, where exposure to moisture can compromise product integrity.
Applications of the Cardboard Water Absorption Tester
The Cardboard Water Absorption Tester has broad applications across multiple industries, including:
Main Parameters of the COBB-01 Cardboard Water Absorption Tester
| Test Range | 1~500N(0.06~33.3 KN/m) |
| Compression Distance | 0.3~0.7mm |
| Clamping Length | 30+0.5mm |
| Test Speed | 3±0.1mm/min |
| Resolution | 0.01N |
| Sample Size | 15*75mm W*L |
| Gas Pressure | 0.5 MPa |
| Gas Port Size | Ф6 mm |
| Power | AC 110~220V 50Hz |
These technical specifications make the COBB-01 Cardboard Water Absorption Tester suitable for a wide range of applications, ensuring accurate and reliable results for any testing scenario.
COBB Sample Cutter Specifications
The COBB sample cutter is an essential accessory for ensuring that all samples used in water absorption testing are of the same size and shape, providing consistency across tests.