Importance of Cobb Sizing Test in Paper and Packaging Industry

Importance of Cobb Sizing Test in Paper and Packaging Industry

In any industries, the quality assurance of the products is dependent on many factors. One such factor is the quality of packaging used for packaging the products. The packaging of a product is solely responsible for protecting the products from any external threat such as water or moisture. A packaging material must have the ability to absorb any sort of moisture without losing its integrity. The manufacturers of the packaging materials also must ensure that the material they are suing for manufacturing the containers is capable enough to survive the moist condition that it may face during its usage.

It is fundamental for paper and packaging producer to comprehend the reason and standard working technique of Cobb value tester for quality appraisal of paper or folded fiberboard.

Reason for Cobb Sizing Test
Cobb sizing tester decides the measure of water or any fluid consumed by the paper, layered fiberboard, and paperboard in a given time frame under certain conditions. Water absorptiveness is an element of different attributes of paper or board, for example, porosity, measuring, and so forth The high Cobb estimation of the papers and cardboards demonstrates the capacity of the materials to hold or assimilate the dampness. Contingent on the utilization of the board, the Cobb esteem should be kept up. The test incorporates inspecting of the amount of water retained in a specific timeframe by non-bibulous paper having a thickness of 0.1 mm.

Standard Operating Procedure for Cobb Sizing Tester
Pacorr produces the best quality of Cobb Sizing Tester according to the standard techniques – TAPPI – T 441 and ISO – 1060 (Part 1) – 1966. The standard working method of Pacorr's Cobb Sizing Tester according to the referenced guidelines seems to be:

• A example of paperboard or ridged box more than the edges of the installation is taken. Presently gauge it to closest 0.1 gram.
• Now spot a plug sheet on the metal plate and afterward place the gauged example on it and brace the example immovably to forestall any sort of spillage between the example and the ring.
• To guarantee the release free bracing between the ring and the upper surface of the example during the test, utilize delicate versatile and non-spongy gasket of same inner measurement as of the ring.
• Now empty water into the installation according to the prerequisite of the example (reference 10mm stamping and 25mm. stamping) for 100ml and 250ml separately and start your stopwatch right away.
• Let the example inside the barrel shaped ring for 120 seconds (in the event of Paper) and 300 seconds (if there should arise an occurrence of folded sheets)
• Reject the examples that give any indication of spillage or spillage.
• If any fluid is gone through the sheet to the elastic tangle, the test isn't satisfactory and will be dismissed.
• The principles time span of 120 seconds on a solitary sheet utilizing 10 mL of water to wet is 1 cm profound. (Season of the test can likewise be changed according to the idea of the paper).
• Once the ringer of the stopwatch buzz, take out the example from the chamber.
• Now with the assistance of hand roller empty out the overabundance water from the example without applying any weight and pivoting the roller one time forward and one-time reverse way.
• On layered sheets, the roller is applied toward the path corresponding to woodwinds of the folded board.
• Now again gauge the example.

Formula to Calculate COBB Value
Cobb Value = Weight of the sample after testing – Weight of the sample before testing
It is extremely simple to work Pacorr's Cobb Sizing by following previously mentioned, working technique.