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Hello,

Is there a way that a user can register another user? Example is that we have a security of a company wanting to register several individuals and pay for it with a company credit card, but the card is in her name.

Thanks,

Colin R.

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Adhesion is a word that covers many issues that are central to converters. At one extreme is the level of adhesion of an easily removable laminate. At the other is the need to ensure that a coating will remain stuck to the substrate during an aggressive tape adhesion test. In between there are pressure-sensitive adhesives, hot melt adhesives and fun ideas such as gecko tapes. And fighting against you are the ravages of time, temperature, humidity and light.

This course unites all these aspects by looking at the forces that hold things together (surface energy, chemical adhesion, \"nail adhesion\", entanglement), the forces that separate them (vertical pull and horizontal crack propagation), the extra effects that dissipate those separating forces and therefore enhance adhesion and the things that undermine adhesion in the long term.
By having a clear idea of what effects are important for each aspect of an adhesion issue, by clearing away some popular adhesion myths, and by having a set of practical tools to implement each relevant aspect of the theory, those who have attended the course will be able to make an incisive contribution to practical problem solving in the lab and in production, in formulation and in practical trouble-shooting.

If you would like your certificate or course booklet mailed to you for this course, please contact training@rolltoroll.org to share your mailing address.

Comments from past attendees:

\"Professor Abbott was very entertaining as a presenter. This class could have been torture, but he made it fun and interesting.\"

\"Great job, very informative and it was nice to see a different view on adhesion.\"

\"All topics were valuable because Professor Abbott touched each topic at a good level.\"

\"Very well taught and detailed! And appreciate the info provided for future use.\"

Course Instructor

The course is given by Professor Steven Abbott who combines his own academic and industrial coating experience to give you the best of both worlds - focusing only on the bits of theory that can give the maximum real-world impact.

Course Outline
Preliminaries

Getting comfortable with units and terminology

Sticking together

What holds things together?
What are the relative strengths of those effects?
The whole of adhesion science in 30min
Surface tension and surface energy
What are they?
How are they measured?
How are they measured in even more detail (and when would you bother)?
Good wetting does NOT equal good adhesion
Quick diagnostics for emergencies

Surface enhancement

Cleaning
Roughening (and why it doesn''t work like they say)
Increasing surface energy (corona, plasma ...)
... and why it''s often irrelevant and/or counter-productive
Chemical primer coatings (or how to shift the problem up one level)

A Crash Course in Rheology

The rheology you need for understanding adhesives
How to love G'' and G''''
The joys of Temperature-Time Equivalence & WLF

Polymers

A reminder of the basics
Why do we care about different molecular weights?
What is Tg and why does it matter?
Rigid polymers and floppy polymers - the science of snakes
What is the size of a polymer molecule - and why does it matter?
What is a DMA curve and why should we care about it?
Why we really need to know about solution viscosity and melt viscosity curves

Like attract like

Why does like attract like?
How do you know how \"alike\" two things are?
Using Hansen Solubility Parameters as a good enough guide
How \"like\" controls adhesion - HSP, the chi parameter, inter-penetration and more

Light adhesion

Why it is so easy...
... and why it can easily go wrong
How to be Spiderman

Strong adhesion

The violence of a tape test....
... and what is needed to survive it
... and why surface energy is 1000x too small to be relevant
Why thin layers can be stronger than thick ones
Why nail adhesion is not good enough
... and why we need entanglement
How to get entanglement
... likeness
... solvent
... heat
... and the real reason that corona treatments can sometimes work
Adding chemical bonding
Why aiming for super-strength can give super-weakness

Adhesion via dissipation

Pressure Sensitive Adhesives?
...complications, contradictions, insights, explanations
Why \"bad\" polymers give \"good\" adhesion
Dahlquist criterion and Chang windows
Controlled \"bad\" adhesion: Easy peel, Cohesive failure
The key measurements for PSA formulators

Hot melt adhesives

(Mostly) PSAs with the complication of hot application

Undermining adhesion

Temperature
Moisture
Ultra Violet light
Bad things in Production

A short-cut to lifetime measurement

Why 60-day adhesion tests give so little information for so much time
ASAP - how to get much more lifetime information in far less time

Applying it to real life

Trouble-shooting tips
Class discussion of attendees'' real-world issues

Who should take this course?

This course is suitable for Technical staff who have a need for a deeper understanding of adhesion that they can apply to their real-world formulation difficulties. No particular technical expertise is required, just some experience with general adhesion issues and a willingness to be open to ideas that can help solve those problems. Attendees will be provided with the necessary spreadsheets and apps to bring theory and formulae to life so that the ideas from the course can be applied straight-away to problems in the lab and on the production line.

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Converting School Online - Adhesion and Adhesives for Convertiers

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