COBB Sizing Tester To determine the capacity of water absorption Paper - Paperboard.
Models: CT-100, CT-50, CT-25, CT-10
Applicable Standards:
TAPPI T441, ISO 535, NF Q-03-018, NF Q-03-035, FEFCO 7, DIN 53132, EN 20535, SCAN P12
Test Description:
The COBB Sizing Tester is designed to measure the amount of liquid penetration into paper and cardboard sheets. The COBB value determines the degree of gluing, calculated as the weight of water absorbed over a specified time per 1 m² of material under standard conditions (ISO 535).
The device features a cylindrical container mounted on a metal base with a flexible sealing sheet. Samples are pre-weighed (accuracy: 1 mg) and placed inside the tester. A specified amount of distilled water (100 ml ± 5 ml) is poured into the container, and a timer is started. At the end of the selected period (e.g., 60 seconds), the water is drained.
Key Features:
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Quick Sample Clamping: Spring-loaded mechanism.
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Standard Test Area: 100 cm² sample area.
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10 kg Stainless Steel Roller: For effective water removal.
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Soft Rubber Sealing Gasket: Ensures no lateral water seepage.
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Material Construction: High-quality stainless steel for durability.
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Optional Models: Available in 100 cm², 50 cm², 25 cm², and 10 cm² test areas.
Additional Equipment Required:
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Blotter sheets (200–250 g/m²).
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Analytical balance (sensitivity: 0.001 g).
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Stopwatch.
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Graduated glass cylinder.
Specifications:
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Dimensions (W x D x H): 200 x 300 x 180 mm.
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Gross Weight (with roller): 18 kg (CT-100 model).
Optional:
A simple COBB apparatus is also available with screw-based sample clamping and a manual tightening knob. Models include test areas of 100 cm², 50 cm², 25 cm², and 10 cm².