Material Cobb Tester

Introduction

A material Cobb tester is an instrument used to measure the water absorption of the paper and the board by the Cobb method, and it is used in the paper, the packaging, and the quality control industries. The Cobb test measures the amount of the water absorbed by the surface of the paper or the board in a specified time, and it provides the Cobb value, expressed in grams per square meter, following the standard test methods, such as the ISO and the TAPPI standards; the material Cobb tester consists of a test device with the ring, a roller, a stopwatch or the timer, and the accessories, and it is used for the measurement of the water absorption of the paper, the board, and the corrugated board, for the assessment of the surface sizing, for the quality control, for the product development, and for many other applications; the material Cobb tester is an essential instrument for the paper testing. Material Cobb testers are used in the paper industry, in the packaging industry, in the quality control, in the laboratories, and for many other applications. With their Cobb measurement, material Cobb testers are essential for the paper water absorption assessment.

Cobb Tester T-S210CT

Cobb Tester provides a 100cm² standardized test area, ensuring accurate water absorption measurements for paper and board materials. It maintains a controlled water volume of 100 ml for ...

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Standards

ISO 535:2023-Paper and board-Determination of water absorptiveness-Cobb method

ISO 12048:1994-Packaging-Complete, filled transport packages-Compression and stacking tests using a compression tester

Complies with the above standards, but is not limited to them.

Features

1. Cobb tester for measuring water absorbency of paper, paperboard and corrugated board.

2. Standardized cylinder and roller method for reproducible Cobb value determination.

3. Suitable for paper manufacturing, packaging quality control and research laboratories.

4. Includes test cylinder, roller, specimen cutter and accessories for complete testing.

5. Supports evaluation of water resistance and sizing effectiveness of paper products.

FAQ

Q1: What testing scenarios is this instrument mainly applied to?

A: The Cobb tester is used in paper manufacturing, packaging industry, quality control laboratories and research institutions to measure the water absorbency (Cobb value) of paper, paperboard, corrugated board and other sheet materials. It supports paper quality assessment, sizing agent evaluation, packaging material selection, product specification compliance and research. The Cobb value indicates the amount of water absorbed by a specified area of paper under controlled conditions and time, which is critical for packaging applications where water resistance affects product protection, printing quality and structural integrity. It is essential for paper mills optimizing sizing formulations, packaging manufacturers verifying material suitability, and converters ensuring that paper and board products meet required water resistance specifications for food packaging, shipping containers and industrial applications.

Q2: What standards does the instrument comply with?

A: The test method follows ISO 535 for paper and board water absorptiveness (Cobb method), TAPPI T441, ASTM D3285 and the corresponding GB/T 1540 method. The instrument complies with relevant laboratory safety standards. Test cylinder area, water volume and contact time should follow the standard specification, typically 60 seconds for paper and 1800 seconds for board.

Q3: What is the warranty period for the whole machine and key components?

A: The tester, cylinder and roller are covered by a 12-month warranty. Specimen cutters, seals and blotting paper are consumables or accessories excluded from warranty. Damage from improper use or unauthorized repair is excluded.

Q4: Is this device difficult to operate? Is professional training required?

A: Operation requires basic training in specimen preparation, test procedure and weighing. We provide an operation manual and remote guidance. Proper specimen cutting, water temperature, contact time and blotting technique are important for accurate Cobb value measurement.

Q5: What is the typical lead-time for order delivery?

A: Standard models require 7-30 working days. In-stock units can ship within 3-7 working days. Custom configurations or large built-to-order systems may require additional time, and we confirm the exact schedule before order confirmation.

Q6: Is regular calibration required? What is the recommended calibration cycle?

A: Balance calibration should follow the laboratory quality system. Cylinder dimensions and roller weight can be verified periodically. Full method verification with a reference paper is recommended for accredited laboratories. No formal metrological calibration is typically required for the mechanical tester.

Q7: Are supporting consumables universal?

A: Blotting paper, specimen cutters and seals are available from laboratory suppliers, though blotting paper quality should match the standard specification. Long-term consumable cost is low, with blotting paper being the main recurring item.

Q8: Can I customize parameters or supporting accessories?

A: Customization includes cylinder size, roller weight and specimen cutter configuration. Additional blotting paper, cutters and accessories can be ordered separately. Custom orders extend delivery lead-time.

Q9: Does the purchase include on-site installation and commissioning service?

A: Standard delivery includes the tester, cylinder, roller and accessories with an operation manual. Remote commissioning guidance is provided. On-site service is not included for standard orders.

Q10: What types of samples are compatible with this equipment?

A: The tester handles paper, paperboard and corrugated board within the standard specimen dimensions. Very thick or very thin materials may require adjusted test parameters. Highly sized or coated papers may have very low Cobb values requiring longer contact time. Users should follow the standard method for specimen conditioning, water temperature, contact time, blotting technique and weighing procedure, selecting the appropriate contact time based on material type and expected absorbency level.