Product Specification

COBB Tester Water Absorption Property Of Paper/Paperboard Paper Packaging COBB Testing Machine And Sample Cutter

Introduction to the COBB Testing Machine (COBB-01)

The COBB Testing Machine, also known as the COBB-01 COBB Tester, is a precise instrument designed for measuring the water absorption properties of paper and paperboard. This test is essential in evaluating the water resistance of materials used in packaging, printing, and various industrial applications. The COBB Testing Machine follows the internationally recognized Cobb method, making it a crucial tool for manufacturers, researchers, and quality control teams.

The COBB Testing Machine is specifically designed to test paper and cardboard with a basis weight above 50g/m², ensuring that results are accurate and reliable for materials such as packaging papers, corrugated boards, and other paper-based products. However, it is not suitable for unsized papers or those with low sizing degrees or excessive pinholes.

About the COBB Test

The COBB Testing Machine evaluates the water absorption capacity of paper or cardboard by measuring the mass of water absorbed by the material per unit area (g/m²). The test involves placing a known area of the material in contact with water for a specified duration and then measuring the increase in weight.

The test is essential for manufacturers and quality control labs to understand the water absorption properties of paper-based materials, which can affect printing, packaging, and overall product performance. Key parameters for testing include:

• Water Absorption Time: The duration the sample is in contact with water.
• Cobb Value: The calculated mass of water absorbed in grams per square meter (g/m²).

Why Choose the COBB Testing Machine?

The COBB Testing Machine is crucial for manufacturers looking to ensure the quality and durability of their paper and cardboard products. With the COBB Testing Machine, you can:

• Accurately assess the water absorption capabilities of paper and cardboard surfaces.
• Ensure that your materials meet industry standards for packaging, printing, and product performance.
• Prevent issues related to ink smudging, poor print quality, and compromised product integrity.

Whether you are in the packaging industry, food production, or any sector that uses paper and cardboard materials, the COBB Testing Machine is an indispensable tool for maintaining high-quality standards.

COBB Test Parameters

The COBB Testing Machine follows international standards such as GB/T1540, ISO 535, and TAPPI T441. Key parameters for the COBB Test include:

These precise parameters ensure that testing is consistent and reliable across different materials and test environments.

COBB Sample Cutter

For effective and accurate testing, the COBB Sample Cutter is a complementary tool that precisely cuts a sample with a diameter of Ø125mm. This ensures that each test sample is uniform and meets the specified testing area. The COBB Sample Cutter is particularly useful in corrugated board and carton production, quality control, and research departments.

Test Procedure with the COBB Testing Machine

1. Sample Preparation: Weigh the paper or cardboard sample before testing.
2. Water Absorption: Immerse one side of the sample in water for the recommended test duration.
3. Excess Water Removal: After the test time, remove the excess water using the standard metal roller.
4. Re-weighing: Immediately weigh the sample after excess moisture has been removed. The weight increase is used to calculate the Cobb Value.

Standards Compliant with the COBB Testing Machine

The COBB Testing Machine complies with a variety of international testing standards, ensuring that results are reliable and comparable across different industries. These standards include:

• GB/T1540: National standard for paper and board testing in China.
• ISO 535: International standard for water absorption of paper and paperboard.
• QB/T1668: Chinese national standard for testing paper and paperboard water absorption.
• TAPPI T441: Standard method for measuring water absorption in paper and paperboard.

Applications of the COBB Testing Machine

The COBB Testing Machine is widely used in industries where the water absorption properties of paper and cardboard are crucial. This includes:

• Packaging Industry: Ensuring the durability and performance of packaging materials.
• Food and Beverage Packaging: Ensuring that packaging materials can withstand moisture during storage and transportation.
• Printing Industry: Evaluating paper quality for printing purposes, ensuring that ink adheres properly and does not smudge.
• Laboratories and Research: Providing accurate data for research and development, especially in material science and product design.

COBB Testing Machine Advantages

• Durability: Made of high-quality stainless steel for long-lasting performance.
• Precision: The COBB Testing Machine offers highly accurate measurements with minimal error.
• Standard Compliance: Fully conforms to international testing standards for reliable results.
• Ease of Use: Simple operation with clear test parameters and easy-to-read results.

FAQs

1. What is the Cobb Value?
The Cobb Value represents the mass of water absorbed by 1 m² of paper or cardboard in a specified time under controlled conditions.

2. How is the COBB Test conducted?
The test involves immersing a paper sample in water, removing excess moisture, and measuring the increase in weight to determine the water absorption rate.

3. Why is the COBB Test important?
The COBB Test helps determine the suitability of paper and cardboard for various applications, such as packaging and printing, by evaluating their water absorption properties.

4. What is the purpose of the COBB Sample Cutter?
The COBB Sample Cutter ensures that paper and cardboard samples are cut to the exact size needed for accurate testing.

5. What standards are used in COBB testing?
The COBB Testing Machine adheres to international standards such as ISO 535, TAPPI T441, and GB/T1540 for reliable and comparable results.