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COBB Tester
A COBB tester is a device specifically designed to measure the water absorption properties and moisture resistance of paper, cardboard and corrugated products under standard conditions and times. In many ways, it can be seen to be a perfect testing device that can be used in paper manufacturing, packaging applications, printing plants and quality control laboratories, with few subjective evaluation methods that would affect the poor performance of paper materials. The most common uses of a COBB tester include the direct measurement of water absorption capacity and surface hydrophobicity using newsprint, kraft paper, corrugated boards, paperboard substrates, coated papers, and other paper-based products made from a cellulose fibre base. A well-calibrated water delivery system will work in conjunction with a precise timing mechanism, incorporating an extensive library of standardised test methods and processes to facilitate a successful result. Newer clamping designs and scale graduation allow COBB testers to achieve repeatable and reproducible results, with consistent absorption values when evaluating surface treatments, coating performance or moisture barrier characteristics. Furthermore, COBB testers always provide a consistent test method that is usually accomplished by simply moving a test sample to the clearly defined measurement scale, enabling users to easily perform standardized tests and log water absorption values. Find some of the great deals on quality COBB testers here at Aajjo. Read more
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Cobb Sizing Tester
₹ 10,000
Get Best Price| Brand: Others |
| Area of opening of reservoir : 100 cm2 |
| Diameter of SS roller : 100 mm |
| Height of reservoir : 25 mm |
| Inner diameter of reservoir : 112.8 mm |
Cobb Sizing Tester
₹ 15,000
Get Best Price| Brand: Others |
| Area of opening of reservoir: : 100 cm2 |
| Diameter of SS roller: : 100 mm |
| Height of reservoir: : 25 mm |
| Inner diameter of reservoir: : 112.8 mm |
₹ 15,000
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Cobb Tester
₹ 18,500
Get Best Price| Brand: Others |
| Depth of cylinder : 60 mm |
| Diameter of rubber pad : 145 mm ± 1 mm |
| Roller length : 200 mm ± 1 mm |
| Sample Diameter : 130 mm (approx) |
Vertex Engineers and Associates
Thane, Maharashtra
COBB Tester
₹ 12,500
Get Best Price| Brand: Others |
| Color : Blue, Silver |
| Dimension : 270*400*300mm |
| Material : SS |
| Surface Finish : Color Coated |
COBB Sizing Tester
₹ 1,500
Get Best Price| Brand: Others |
| Brand : PRESTO |
| Depth Of Cylinder : 60 mm |
| Diameter : 130 mm (approx) |
| Item Code : PCS-23 |
Cobb Sizing Tester
₹ 70,000
Get Best Price| Brand: Others |
| Brand : Effective Lab India |
| Country of Origin : Made in India |
| Depth of cylinder : 60 mm |
| Diameter of rubber pad : 145 mm |
Analog Cobb Sizing Tester (Titing Type), Grade: A, 220VOLT
₹ 14,000
Get Best Price| Brand: Others |
| Brand : GLOBAL ENGINEERING CORPORATION |
| Country of Origin : Made in India |
| Display Type : Analog |
| Grade : A |
Analog Cobb Sizing Tester
₹ 14,500
Get Best Price| Brand: Others |
| Brand : SKE |
| Display Type : Analog |
| Minimum Order Quantity : 1 Piece |
| Weight : 16-20 KG. |
₹ 12,500
Cobb Sizing Tester
₹ 12,000
Get Best Price| Brand: Others |
| Body Material : MS |
| Brand : Kanjoliya |
| Standard : ASTMAs |
| Weight of Couch Roll : 10 Kg |
₹ 12,000
COBB Sizing Tester, Grade: Automatic
₹ 10,000
Get Best Price| Brand: Others |
| Delivery Time : 1 Weeks |
| Display Type : Digital |
| Material : SS |
| Production Capacity : 10 |
₹ 12,000
Digital COBB Tester, 240V
₹ 500
Get Best Price| Brand: Others |
| Brand : Sunshine Scientific |
| color : standard |
| Country of Origin : Made in India |
| Delivery Time : 1-2 Weeks |
Analog Paper Cobb Sizing Tester, 220V
₹ 14,000
Get Best Price| Brand: Others |
| Brand : Pinkcity Technology |
| Display Type : Analog |
| Finishing : Polished |
| Test Inside area : 100kg/cm2 |
Paper Cobb Sizing Tester, Grade: SS304
₹ 18,500
Get Best Price| Brand: Others |
| Cobb Diameter : 15 x 15 x 15 cm |
| Grade : SS304 |
| Material : Stainless Steel |
| Power Supply : Manual Operated |
COBB Sizing Tester, 240 V
₹ 10,500
Get Best Price| Brand: Others |
| Brand : K D Labs |
| Depth Of Cylinder : 200 mm |
| Frequency : 50 Hz |
| Height : 80 mm |
₹ 12,500
Cobb Sizing Tester
₹ 12,000
Get Best Price| Brand: Others |
| Absorbency paper : Good Cobb Value For Paper 30 |
| Couch roll : 10 Kg |
| Grade : Class A1 |
| Rubber Pad Diameter : 138 mm |
Mild Steel COBB Tester
₹ 21,000
Get Best Price| Brand: Others |
| Depth : 140 mm |
| Diameter : 130 mm |
| Height : 80 mm |
| Material : Mild Steel |
Analog Cobb Sizing Tester
₹ 1,100
Get Best Price| Brand: Others |
| Brand : Testronix |
| Country of Origin : Made in India |
| Depth : 60 mm |
| Display Type : Analog |
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COBB Tester related Questions/Answers
What is a cobb tester?
A Cobb tester is a laboratory instrument used to measure the water absorption capacity of paper, paperboard, and similar sheet materials. It determines the Cobb value, which represents the amount of water absorbed by a sample over a specific period, usually 60 seconds, and is expressed in grams per square meter (g/m²). This test is crucial in industries like packaging, printing, and construction, where moisture resistance directly affects product quality and durability. The Cobb tester helps manufacturers assess the water resistance and absorbency of materials, ensuring consistency and reliability in production. By measuring how much water a material absorbs, the Cobb tester supports quality control and helps prevent product failures due to excessive moisture uptake.
What is the use of a Cobb tester?
A Cobb tester measures how much water a sheet of paper, paperboard, corrugated fibreboard or textile absorbs. The result called the Cobb value, is the mass of water taken up by one square metre of the sample during a set time - it is reported in grams per square metre. Packaging printing and paper plants use the value to check that their products resist moisture plus keep their strength when humidity or water contact them during manufacture, storage or shipment. Knowledge of absorbency lets the plant keep quality at target, adjust the amount of sizing agent and stop the sheet from losing strength or changing dimensions. The Cobb tester therefore serves as a standard instrument for quality control but also for research in any field where material behaviour in the presence of water is important.
What is a Cobb test?
The Cobb test also called the Cobb sizing test, measures how much water paper, cardboard or corrugated fiberboard absorbs during a fixed time, normally 60 - 180 seconds. The result is given in grams per square metre (g/m²). A lower Cobb value shows that the material resists moisture better, a property that is essential for quality in packaging and printing.
What is the formula for the Cobb test?
The Cobb test formula measures how much water paper or paperboard soaks up. The standard Cobb number, given in grams per square metre, is found - subtracting the dry mass from the wet mass multiplying the difference by 100 and dividing the result by the test area in square metres. Cobb Value (g/m²) = (Wet Weight - Dry Weight) × 100 / Sample Area (m²). Wet Weight is the mass after water contact - Dry Weight is the mass before contact - Sample Area is the part that touches the water. When the test piece is 100 cm², the area equals 0.01 m² - the division by 0.01 turns into a multiplication by 100. The short form becomes Cobb Value = (Wet Weight - Dry Weight) × 100. This number shows how much water the sheet holds. Packers and papermakers use it to check quality.
How to use cobb tester?
To use a Cobb tester, cut a circular sample that exceeds 100 cm² and record its dry weight. Lay the sample between the clamping plate plus the water chamber then fix it firmly. Turn the unit until the sample touches the water and add 100 ml of water to the chamber. Start a stopwatch but also let the sample absorb water for the set period, usually 45 - 60 seconds. When the time ends, turn the unit back, lift the sample out and remove surplus water - rolling blotting paper over it. Weigh the damp sample to find the weight gain - this figure yields the Cobb value. The test measures how much water the paper takes up as well as serves as a check for quality in paper and packaging plants.
How much does a Cobb tester cost?
A Cobb tester usually costs between ₹10,000 and ₹35,000 in India. The exact price depends on the model, its features plus the manufacturer. A simple hand operated unit for laboratory or factory work sells for around ₹12,000 to ₹15,000. A fully automatic machine or one with extra options often reaches ₹60,000 or more. The price rises if the body uses stainless steel, if the readings are highly accurate or if the unit pours water by itself and shows results on a digital screen. Certain sellers add a warranty but also small accessories - large orders also change the final figure. For routine water absorption tests on paper or board, a dependable Cobb tester normally sits in the ₹12,000 - ₹15,000 band.
How to check cobb value of paper?
To check the Cobb value of paper, cut a 100 cm² circle and weigh it to obtain the dry weight (W1). Fix this disk in the Cobb tester plus clamp it firmly so that no water leaks. Add 100 ml of water to the chamber and allow the paper to absorb water for 60 seconds. At the end of the period, lift the sample out at once but also remove surface water - pressing it between blotting paper or an absorbent cloth. Weigh the damp sheet to obtain the wet weight (W2). Calculate the Cobb value with the formula - Cobb Value (g/m²) = (W2 - W1) × 100, because the test area equals 100 cm². The result shows the mass of water the paper takes up per square metre and serves as a key quality check for packaging as well as paper products.
What is a good cobb value?
A good Cobb value depends on the intended use of the paper. Broadly speaking a low Cobb value shows high water resistance and high quality in packaging plus printing papers. Many packaging grades work well with a Cobb value from 25 - 45 g/m². Papers that serve tropical climates or moisture sensitive tasks need a Cobb value below 30 g/m² for reliable performance. Blotting papers and other absorbent grades need the opposite - they often show Cobb values above 100 g/m² because they must take up water. A good Cobb value, therefore, is the value that meets the demands of the final use - the paper either resists or accepts moisture to give the required durability but also function.
What is the Cobb 60 test method?
The Cobb 60 test method is a standard way to find out how much water paper or paperboard absorbs in exactly one minute. It follows ISO 535 and similar rules. A cut sample is placed in a metal Cobb ring, 100 mL of water is poured on top and after 60 seconds the water is poured off and the wet sheet is blotted and weighed. The result called the Cobb value, is the mass of water held by one square metre of the sheet - it is reported in grams per square metre. Mills use the figure to check that boxes, bags or printing stock will resist water as expected. The one minute version is chosen for routine work because the steps are few plus the outcome repeats well.
