Converting Quarterly title
The Official
Technical Magazine
of AIMCAL
small AIMCAL logo
  Search

Web Coating

Blogmaster: Dr. Edward D. Cohen

25 Latest Articles Current Articles | Archives | Search
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...

[Read the rest of this article...]

Posted in: Coating All Other
Actions: E-mail | Permalink | Comments (0) RSS comment feed | del.icio.us
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...

[Read the rest of this article...]

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
Actions: E-mail | Permalink | Comments (0) RSS comment feed | del.icio.us
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 ...

[Read the rest of this article...]

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
Actions: E-mail | Permalink | Comments (0) RSS comment feed | del.icio.us
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...

[Read the rest of this article...]

Posted in: Defects Characterization Causes & Cures
Actions: E-mail | Permalink | Comments (2) RSS comment feed | del.icio.us
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...

[Read the rest of this article...]

Posted in: Coating All Other, Coating Applicator Roll Coating, Coating Applicator, Slot Die, Slide, Curtain
Actions: E-mail | Permalink | Comments (0) RSS comment feed | del.icio.us
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
Actions: E-mail | Permalink | Comments (0) RSS comment feed | del.icio.us
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...

[Read the rest of this article...]

Posted in: Coating Applicator, Slot Die, Slide, Curtain
Actions: E-mail | Permalink | Comments (0) RSS comment feed | del.icio.us
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...

[Read the rest of this article...]

Posted in: Dryers & Drying
Actions: E-mail | Permalink | Comments (1) RSS comment feed | del.icio.us
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 ...

[Read the rest of this article...]

Posted in: Coating Solution Handling
Actions: E-mail | Permalink | Comments (0) RSS comment feed | del.icio.us
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...

[Read the rest of this article...]

Posted in: Coating All Other
Actions: E-mail | Permalink | Comments (1) RSS comment feed | del.icio.us

Blogmaster

Edward Cohen photo

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.