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Web Coating

Blogmaster: Dr. Edward D. Cohen

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02

CURL

Posted by Edward Cohen on January 2, 2012
CURL
Curl is the tendency of a coated film to curve towards the coated side of the film instead of lying flat can be created in several different parts of the web coating process, substrate manufacture, drying in coating line, lamination, storage and normal usage. Curl is caused in the dryer by  res...

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Posted in: Defects Characterization Causes & Cures
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26

Limits of coatability

Posted by Edward Cohen on December 26, 2011
Limits of coatability
In all coating processes  there is an operating region in which a uniform, stable defect free coating can be made. Outside of that region the coating is not stable  and defective coatings will be made will be produced. There are several variables, solution flow rate & wet thickness, rh...

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Posted in: Coating All Other, Coating Applicator Roll Coating, Coating Applicator, Slot Die, Slide, Curtain
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15

2012 AIMCAL Web Coating Webinars

Posted by Edward Cohen on December 15, 2011
I am in the process of developing the topics to be covered in the 2012 AIMCAL coating technology Webinar series. If there are any topics or presenters that you believe should be scheduled, send me the information. Ed Cohen
Posted in: Coating All Other
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13

Simultaneous Multilayer Coating Is A Practical Efficient Process

Posted by Edward Cohen on December 13, 2011
Simultaneous Multilayer Coating Is A Practical Efficient Process
One of the many technologies that will drive the growth of the web coating process (also called Roll-to-roll) is the development of Simultaneous Multilayer Coating process. Several technology and manufacturing advances have resulted in a process that has the ability to coat a wide range of propertie...

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Posted in: Coating Applicator, Slot Die, Slide, Curtain
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10

Drying Defects: Blisters

Posted by Edward Cohen on December 10, 2011
Drying Defects: Blisters
Blisters are drying defects that are often encountered in the web-coating process. They can either be a small, dome-like protrusions or a small recessed in the dried coating film. They tend to occur all over the surface of the coating. While they appear as two different types, protrusions and depres...

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Posted in: Dryers & Drying
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05

Where To Use Filters In The Coating Process

Posted by Edward Cohen on December 5, 2011
Where To Use Filters In The Coating Process
Comprehensive filtration is an efficient, low-cost method of reducing coating and drying defects that are the result of foreign material, contaminants, being introduced into the coated layer. In the ideal process these defects could be prevented by not introducing the contaminants at all components ...

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Posted in: Coating Solution Handling
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03

Coating & Drying Process Measurements

Posted by Edward Cohen on November 3, 2011
Coating & Drying Process Measurements
A coating line is comprised of many basic process elements and subsystems--all of which must perform as specified to obtain a high-quality, low-cost product. The important components of the coating line include the solution mixing process, the coating applicator and ancillary hardware, the dryer and...

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Posted in: Coating All Other
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28

AIMCAL 2011 Web Coating Conference

Posted by Edward Cohen on October 28, 2011
The AIMCAL Web Coating Conference was held in October 2011. The goal of the meeting is to provide a forum exchange of technical information personnel in the web coating Industry. There were sessions on Web Coating and Laminating Technology, Vacuum Web Coating Technology and Plenary sessions. The ...

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Posted in: Coated Product Measurement & Characterization, Coating All Other
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21

Help With Defect Samples

Posted by Edward Cohen on October 21, 2011
  I am in the process of collecting web coated Defect Samples to be used to prepare a “Defect Catalogue”.  If any one has extra defect samples that they can spare, I would appreciate your sending them to me. I would like to obtain sheets with the defect name and if possible th...

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Posted in: Defects Characterization Causes & Cures
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10

The Importance of Correctly Naming a Defect

Posted by Edward Cohen on October 10, 2011
One of the important required steps to eliminate a web-coating defect is to insure that correct name is initially given to the observed defect. This is important because there is no standard naming convention for the many defects that can be created in the web coating process. These defects often ha...

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Posted in: Defects Characterization Causes & Cures
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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.