sop for operation of cobb tester
1.0. OBJECTIVE:
The objective of this SOP is:
1.1 To describe the procedure for finding cobb value of paper and board using cobb tester.
2.0. RESPONSIBILITY:
2.1 The Chemist – Quality Control Packaging shall be:
2.1.1. Responsible for carrying out the analysis as per the procedure.
2.1.2. Responsible for interpretation of the results obtained and recording of the same in Analytical Test Record Sheet.
2.1.3. Responsible for intimating any abnormal observation to Executive – Quality Assurance for necessary corrective actions.
2.2 The Executive – Quality Assurance shall be:
2.2.1 Responsible for ensuring the adherence of SOP.
3.0. ACCOUNTABILITY:
Executive – Quality Assurance
4.0. PROCEDURE:
4.1 OPERATION OF COBB TESTER:
4.1.1 Take a sample of paper /board, whose cobb value is to be determined.
4.1.2 Take the weight of the sample, specimen on weighing balance (W1).
4.1.3 Open the upper jaw of the Cobb tester with handle provided at the top.
4.1.4 Put the sample in between two jaws of the cobb value tester and tight it with the help of handle.
4.1.5 Then press the spring knob provided at right hand and invert the drum.
4.1.6 Add the appropriate quantity of water (10ml for paper and 25ml for corrugated board).
4.1.7 Keep it for 1 minute for paper and 30 minutes for board.
4.1.8 Then press spring knobs provided at right side and invert the drum to remove the water.
4.1.9 Remove the water, keep the sample over tissue paper and cover the sample with another tissue paper.
4.1.10 Move the roller forward and backward over the tissue paper to remove the water from the sample.
4.1.11 Again take the weight of sample on same weighing balance (W2).
4.1.12 Take the difference of the two weights i.e. (W2 – W1) and note the reading of cobb value.
4.1.13 Keep the drum to its original position i.e. handle on upper side.
Acceptance Criteria for Cobb value:
The Cobb value of respective sample shall be between 25 and 35.
5.0. REASON FOR REVISION:
This procedure is modified in order to be more effective in the line of action; responsibility and detail testing procedure and in-corporation of Acceptance Criteria. .
6.0. TRAINING:
Trainer — Executive – Quality Assurance
Trainee — Packaging Lab Personnel
7.0. DISTRIBUTION:
Certified Copy No. 1 : Head of Department – Quality Control
Reference Copy No. 3 : For Display near Cobb Tester
Original Copy : Head – QUALITY ASSURANCE
8.0. ANNEXURE:
Nil.
9.0. REFERENCE:
Manufacturer’s Manual
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