Máy đo độ hấp thụ nước COBB

For measuring the absorption properties of water.

Standards: ISO 535, TAPPI T441, SCAN P12…
General Information:
Water absorptiveness (Cobb value) is the mass of water absorbed in a specific time by a 1 square meter sample of paper, board or corrugated under conditions specified in standards such as TAPPI T 441. Cobb sizing testers provide a simple, standardized method for fast determination of the quantity of water absorbed by a paper or board in a given time.
Technical Specification:
 According to TAPPI T 441
 Two version of operation : Manual clamping or Automatic clamping
 Two version of materials : Stainless steel construction or Aluminium construction for lighter
weight
 Area within cylinder: 100 square centimeter
 Supplied with couch roller, hand rolling, with 10 kg +/- 0.5 kg according to Tappi standard
specification with blotting paper, 8” x 8”, package of 500
Installation Requirements:
 Electrical connection: Not required
 Water connection: Not required
 Compressed air: Not required

TEST DESCRIPTION :
The Cobb equipment allows to measure the liquid amount that penetrates in a paper and board sheet. It is the calculus of the weight of the absorbed liquid in a specified
time per 1 m2 of paper or cardboard. Pour 100 ml of liquid in the cylinder vessel. Weight the dry sample (adjusting to the nearest milligram) and place it, with the face to be tested, in contact with the perimeter of the vessel.
Turn the vessel 180º by means of the lever. The timer will activate automatically. The liquid contained inner the cylinder will be now in contact with the sample. When the sound alarm is active, means that the programmed time for pre-notice has expired. Return the vessel to its initial position. Open the vessel cover, remove the tested wet sample and place it, with its wet face upwards, on a bottling paper. This bottling paper must be previously positioned on the movable support-basis
Once expired the determined time since the beginning of the test (see times according to applied standard), place a second bottling paper over the sample. Eliminate the exceed of liquid from the sample by passing the 10 Kg roller twice (one time forward and another time backward) over it. Be careful not to apply an additional pressure to
the roller when passing over the sample.

Afterward, fold the sample, with the wet side to the interior part, and weight it again.  Therefore, it will be possible to calculate, in grams per meter square, the increment
in mass that has suffered the sample due to the liquid absorption.
Besides of the Cobb equipment, to carry out a complete Cobb test, it is necessary to have blotting papers from 200 a 250g/m2 and an analitic scale with an accuracy of 0,001g.

WEIGHT AND DIMENSIONS (ONLY EQUIPMENT):
430 x 380 x 270 mm (WxLxH) / 20 Kg

WEIGHT AND DIMENSIONS WITH PACKING BOX :580 x 450 x 380 mm (WxLxH) / 30 Kg