Glossary
D-1
P/N 7105144G
2008 Nordson Corporation
VersaBlue_NW
Appendix D
Glossary
Advance Distance
Distance between initiator and gun/application head.
Angel Hair
Fine threads of adhesive that are created when adhesive is incorrectly
transferred from the nozzle to the substrate. This could be caused e.g. by
poor shaving of high viscosity material at the nozzle.
Application Head
Refer to Gun.
Application System, Hot Melt
An arrangement of units and components that melt, feed, meter and apply
hot melt adhesive, e.g. bulk melter, melter, gear metering pump station, gun,
coating stand and heated hoses.
Application Weight
The weight (grammage) of the application material applied to a surface unit
of the substrate.
Determining the application weight: A circle cutter is used to cut several
100 mm
2
sized circles from the uncoated substrate. The cut out sections
should be evenly distributed on the substrate. The samples are each
weighed to exactly 0.01 g, and the average weight is calculated. The same
is done with the coated substrate. The number of samples taken depends
on how much the weights of the samples differ. The application weight is the
difference between the coated and uncoated substrate. The application
weight is usually stated in g/m
2
.
Assembly Handgun
Manually operated system component used to apply material as a bead,
dot, surface or spray application.
bar
Legal unit for pressure. The SI unit is Pascal (Pa). The unit commonly used
in the USA is psi. Refer to Conversions.
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