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Web Coating

Blogmaster: Dr. Edward D. Cohen

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22

Coating-solution delivery system

Posted by Edward Cohen on May 22, 2012
Coating-solution delivery system
The solution-delivery system is a key element in producing a defect-free, coated substrate on a web-coating line. It supplies the coating applicator with the solution to be coated and has the following requirements:          • Deliver a solution or disp...

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Posted in: Coating Solution Handling
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08

Improved laboratory coating hardware

Posted by Edward Cohen on May 8, 2012
Improved laboratory coating hardware
An efficient laboratory and pilot scale coating process is essential to develop new products and to produce commercial quality coatings for initial market development and to meet the initial need for commercial product. A major component of the effective laboratory coating process is to use the same...

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Posted in: Laboratory & Pilot Coaters
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26

Increased drying capacity improves quality and productivity

Posted by Edward Cohen on April 26, 2012
Increased drying capacity improves quality and productivity
Ideally, neither the coating process nor the drying process should limit the product quality or the productivity of a coating line. However, often the dryer is rate limiting and this reduces the capability of the coating process. The reason for this is that in any coating process there is an optimu...

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Posted in: Dryers & Drying
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25

Online defect detection

Posted by Edward Cohen on April 25, 2012
Online defect detection
There several reasons for using online continuous defect detection system in a web coating line. In these systems various technologies are used to rapidly detect defects and store information about them in a computer database.   Online detection is superior to the off-line procedure in which...

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Posted in: Coated Product Measurement & Characterization
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03

Coating Method Trends

Posted by Edward Cohen on April 3, 2012
Coating Method Trends
Because of the wide range of product and requirements, many coating application techniques have evolved and are in routine use. There are 40 separate categories and a total of between 800- 100 configurations. These methods can be classified by the principles used to control the coverage, (coating we...

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Posted in: Coating Applicator Roll Coating, Coating Applicator, Slot Die, Slide, Curtain
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13

Air-Knife Coating Process

Posted by Edward Cohen on March 13, 2012
Air-Knife Coating Process
In regard to the coating process there is a basic principle that that need to be considered when selecting a coating process. There is no coating applicator that is effective for all coatings that are to be applied. As result, there are approximately 40 separate coating methods and about 1000 separa...

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Posted in: Coating All Other
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20

Know Your Coater Design Limitations

Posted by Edward Cohen on February 20, 2012
The number of new and upgraded products that are to be produced by the web coating process is continuing to expand. One of the characteristics of these new products are that they will be specialty products with relatively low volumes. In addition, each product will have very different product requir...

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Posted in: Coating All Other
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16

The Importance Of Procedures and Training

Posted by Edward Cohen on February 16, 2012
The typical coating line is a complex process that consists of 17 major components, table 1, each of which has many subsystems, that are necessary for the successful operation and can a cause defects if not functioning as specified.  The total number depends on the exact design of the coating l...

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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
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29

Web Coating Technology Continuing Education

Posted by Edward Cohen on January 29, 2012
The web coating process is a complicated, technically sophisticated process that has many basic modules, unwind roll, transport roll, prepare coating solution, coating application, dry coated film, online process control, optimize coating solution, and coating line process control. All of these are ...

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Posted in: Coated Product Measurement & Characterization, Coating All Other, 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, Laminating, Metallizing, Process Instrumentation & Measurements, Substrate Surface Treatment, Substrates, Web/Tech, Weblogs
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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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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.