| How Adhesives Really Work? |
|
| The dyne level of the application surface
is very important. Metal has a very high
dyne level and most adhesives stick well
to it. Unfortunately, paints commonly found
on many metal surfaces are not as attractive
to adhesives as the metal itself. Note that
the asset label is sticking to the paint
and not to the metal! Paints can, themselves,
have either a high dyne level or a low dyne
level. Generally, though, we have found that
paints have a high dyne level and are good
surfaces for asset tags or asset labels. |
|
 |
|
| Metal and "hard plastics" have "HSE" or
a "high surface energy". In plastics,
the surface energy of the substrate is increased
by oxidation of the surface through corona
discharge, or flame treating. At an molecular
level, oxygen atoms become available to bond
with the molecules of the adhesive. |
|
 |
|
| Certain polyolefins (such as a polypropylene
or polyethylene drum) have a very low surface
energy (20-35 dynes) and they require a much
softer adhesive for your asset label. |