It is the natural tendency of paper or pulp to absorb water or moisture from its environment, which can have a number of detrimental effects on the finished product. As a result, this absorption of moisture can weaken the material, leading to decreased strength and durability.

Moreover, if the material is used to package sensitive products, the water absorption can damage or even ruin the packed goods, making them unfit for your customers. Therefore, it is important to monitor the water absorptiveness of paper and other packaging materials in order to produce products with the desired performance. Thus, we at Presto have designed a high-quality lab testing instrument known as Cobb sizing tester. This highly standardized laboratory testing equipment has been designed to test the amount of liquid penetration into a sheet of paper or board in a given amount of time.

In this blog, we are going to provide you with information about Cobb sizing tester and how this quality testing equipment is useful in the packaging industry. Let’s get started with what exactly the cobb test entails & why it should be conducted in the packaging industry.

What is the Cobb sizing test and its importance in the packaging industry?

The Cobb sizing test is a method used to assess the water absorptiveness levels of the product over a certain amount of time. Water absorption is an important characteristic of paper and cardboard, and is largely determined by its porosity, sizing, and other physical properties.

With a cobb value these materials are able to absorb and retain more water, which is essential depending on their intended application. The Cobb size test measures the amount of water absorbed by a paper sample of 1 sq. meter over a specified period of time, providing an accurate assessment of its water absorptiveness. Monitoring this value is critical for ensuring that the paper or cardboard meets the required standards of performance.

The main purpose of conducting the Cobb sizing test will help the manufacturers in ensuring that quality material will be delivered to the customers. Now, let us discuss brief information about cobb tester. So, let us get started!

All about Presto Cobb sizing tester

The Cobb sizing test is an important quality test used in the packaging industry to determine the absorbent capacity of paper and paperboard. This test measures the amount of water that a sample of paper or paperboard can absorb in a specific amount of time under standardized conditions.

The results of the Cobb sizing test are used to assess the suitability of paper and paperboard for specific packaging applications. Thus, this quality test helps packaging manufacturers to select the appropriate paper and paperboard for their products, ensuring that the packaging materials are able to protect the contents and maintain their integrity during storage and transport.

Thus, we at Presto have designed a high-quality lab testing instrument known as a Cobb sizing tester machine to measure the water absorptiveness of a substance at a given period of time. It consists of a cylindrical container that is clamped to a flat base with flexible backing on which the sample will be placed.

This TAPPI T 441 Cobb Test will be performed on different industries including paper & packaging to ensure the quality of the material will be delivered.

Now, let us discuss brief information about Presto Cobb sizing tester.

Features of Presto Cobb sizing tester

The Presto Cobb Sizing Tester is reliable and accurate testing equipment for measuring the physical properties of paper and board products. This high-quality testing equipment has been designed with high-end features that make it easy for manufacturers to conduct cobb test for packaging material. Below we have listed the features of this quality lab testing equipment.

  • High: Grade stainless steel test area
  • Rugged structure with the corrosion-resistant main body
  • Lightweight and resilient
  • Fast Locking Mechanism
  • Single-handed High-Quality hassle-free operation
  • Highly accurate test results
  • Standards: IS 1060, TAPPI –T441

Now, let us discuss briefly the 

Technical specifications of Presto Cobb sizing tester

  • Sample Diameter: 130 mm (approx.)
  • Depth of cylinder: 60 mm
  • Diameter of rubber pad: 145 mm
  • Water level indicator in the cylinder: 10 mm and 25 mm
  • Weight of roller: 10 kg (approx.)

With these high-end features and technical specifications, one can easily test the water absorptiveness level of the machine and ensure that quality materials will be delivered to the customers. You can also read about the relevance of the Cobb sizing tests in the packaging industry.


In conclusion, the Cobb sizing test is crucial in the packaging industry as it helps manufacturers to select the appropriate packaging materials for their products. By measuring the absorbent capacity of paper and paperboard, this test enables manufacturers to ensure that their packaging materials can withstand exposure to moisture and other liquids, thus maintaining the quality of the product inside. The Presto cobb test paper is a reliable and efficient instrument that is widely used in the packaging industry for conducting this test. Its user-friendly interface and accurate results make it an invaluable lab testing instrument for assessing the quality of packaging materials, helping manufacturers to maintain high standards and ensure customer satisfaction. You can also give us a call at +91 9210903903 or email us at Our team of technical experts will consult you regarding all your needs and queries.

Content Source – TAPPI T 441 Cobb Test for the paper and packaging industry