A new comment from “David Tanner” was received on the post “Response to Query” of the weblog “Web Coating Blog”.
Comment:
I
would like to add to this post by saying that the Dyne Solutions that
referred to are availible from selected companies, in the UK and Europe
for instance CDE Products have manufactured Dyne solutions for over 20
years.
Effective Networking, A Path Through The Information Overload
Edward Cohen
Even though we live on large planet, with large physical dimension (a Volume of 1.0832073_1012 km_ and a Mass of 5.9736_1024 kg); technologies such as the Internet, Information Sciences, World Wide Web, rapid digital communications ,easily accessible databases and search engines have made it a very small world. It now possible to instantly communicate with persons all over the world and to obtain technical information from most countries, businesses and Universities.
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The Importance of Coating Process Support Systems
Edward Cohen
Ongoing technical projects are needed to improve the quality, cost & productivity of a coating line in order to remain competitive and rapidly develop new products. There are several important considerations when developing and identifying coater needs and deciding on the most effective programs too work on. These are:
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AIMCAl & CEMA will be sponsoring a Seminar on Coating & Laminating. The schedule is below. For more information and to register go to
www.AIMCAL.ORG
Response to Question on “Corona Treatment of metallized CPP film”
Rory Wolf
Enercon Industries Corporation|
rwolf@enerconmail.com
You mentioned that corona treatment of metallized CPP drops from 40 to 37 dynes in 15 days, but corona treatment of un-metallized CPP stays at 40 dynes after the same 15 days.
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Response to Question on “Modes of measuring or characterize plasma treatment efficiency on Kapton”
Rory Wolf
Enercon Industries Corporation|
rwolf@enerconmail.com
Measuring the treatment of a Kapton film is very similar to measuring the treatment level on any other film. Polyimide films are usually optimally surface treated by atmospheric plasmas, after which advancing contact angle measurements are utilized to gauge surface free energy imparted to the surface. Dyne solutions can also be used to gauge surface tension levels.
You used the term “treatment efficiency” in your subject heading. Treatment efficiency is relative to achieving a treatment level within a certain period of time, or within a certain cost objective. Adhesion is key, however. So optimizing adhesion within your efficiency parameters may be what you are referring to.
The October AIMCAL Fall Technical Meeting provided a forum for the exchange of Information between technical personnel in the web coating Industry. 60 papers were presented in three sessions as follows:
• Web Coating & Laminating
• Vacuum Web Coating
• Emerging technologies
In addition there were table to exhibits, which also provide an opportunity for additional technical discussions.
I found all of the presentations were outstanding and provided me with useful technology about the web coating process.
This discussion is a continuation of the role of the Substrate in the coating & drying process which was started in a previous entry “Role Of The Substrate Part 1 Substrate Structure”. This part will discuss the interaction of the substrate with the coating and drying process and its role in final product coating quality and the formation of defects.
The substrate is an integral part of the coating system and it can cause a wide variety of defects, spots, poor adhesion, poor winding properties, coating weight non-uniformity, poor planarity and lay-flat. If the incoming substrate has defects and does not meet specifications, then it will lead to a defective final product. The Old adage Garbage In Garbage Out) definitely applies to the substrate and the coating process. Defective substrate when coated will lead to defective product.
Comparison of Flame vs Plasma Treatment
Rory Wolfe
Enercon Industries Corporation
As a contributor to the AIMCAL blog, it’s great to have this opportunity to answer your question regarding the difference between corona and plasma relative to the treatment of PET or any other polymer films.
The chemical effect on film surfaces with corona will primarily include carbonyl and carboxylic acid along with an oxidative effect. Of course, a plasma system will allow for the deposition if an array of functionalities.
The following chart defines the difference between the processes.
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The substrate used in the coating process is a key element in the successful operation of a web coating process. The substrate is the carrier of the active coating layer. The effect of the substrate on the coating process needs to be understood, optimized and controlled to insure quality and cost. Web and support are also terms used to refer to the substrate.
The major areas of technical importance for the substrate are:
• Substrate structure
• Surface Properties treatments and coatbility
• Mechanical Properties
• Defects Arising from Substrate
• Substrate Flatness
• Specification of Substrate
• Substrate Manufacturing
• Substrate Roll winding & unwinding
• Substrate web handling in coating machine
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