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Blogmaster: Dr. Edward D. Cohen

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Defects Characterization Causes & Cures

13

Bubble spot sources

Posted by Edward Cohen on June 13, 2011
After the observed bubble spots in a coating have been identified as due to bubble in the coating, the next step is to determine the source of the bubbles and eliminate them. There are several potential sources for bubbles in a coating machine. Air can be introduced into the coating solution in the ...

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Posted in: Defects Characterization Causes & Cures, Dryers & Drying
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08

Accurate identification of bubble spots

Posted by Edward Cohen on June 8, 2011
The first step in eliminating bubble spots in a coated layer is to verify that the observed defect is a caused by a bubble. Accurate identification of bubbles is essential to eliminating them. Visually “bubble spots” appear as clear round spots with no coating in the final coated film. T...

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26

Consider contract coaters as part of product scale-up

Posted by Edward Cohen on May 26, 2011
Contract coaters, also called toll coaters, provide web-coating and converting services to assist other companies in the development and manufacture of web-coated products. Typically, they have extensive process facilities to accomplish this task. They have coating methods that can coat a wide range...

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Posted in: Coating Applicator Roll Coating, Coating Applicator, Slot Die, Slide, Curtain, Coating Solution Handling, Coating Solution Measurements & Characterization, Coating Solution Preparation, Defects Characterization Causes & Cures, Dryers & Drying, Laboratory & Pilot Coaters
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Blogmaster

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Dr. Edward D. Cohen

Dr. Cohen is a technical consultant in all aspects of the web coating process. His expertise includes thin film coating and drying process development, coating application and drying of thin films, polyester base development, film defect mechanisms, formulating coatings, image analysis techniques for characterizing coating films and litigation support.

He has over 45 years experience in coating research and manufacturing technology with the DuPont Company and as a technical consultant to the converting and composites industries

He has extensive publications in the field and has co-authored several books: Modern Coating and Drying Technology, Coating and Drying and Defects: Troubleshooting Operating Problems, and chapters in Kirk-Othmer Encyclopedia of Chemical Technology and Water and Solvent Based Coating Technology. His honors are the John Tallmadge Award for Contributions to Coating technology, the AIMCAL President's award in recognition of Meritorious Service to AIMCAL and the Converting Industry, and the ISCST Founders Award. He was the founding president of the ISCST. He has a Bachelor of Science in Chemical Engineering from Tufts University and a Ph.D. in Physical Chemistry from the University of Delaware.