Page 10 - Industrial_Technology_EXTRA_14th Septembert_2020_Classical

ADHESIVES...

Precise dispensing of

anaerobic adhesives

Anaerobic adhesives are the most popular type in industry, and are ubiquitous in

workshops everywhere, used as threadlockers and retaining compounds. Applications
for anaerobic adhesives that require more accuracy and precision in dispensing can
be challenging because of the unique cure mechanism. Here Peter Swanson,
Managing Director at adhesives specialist Intertronics, presents evidence for the use
of preeflow dispensers for anaerobic adhesives

ue to their easy handling and fast presenting a challenge
curing, anaerobic single component for application equip-
adhesives are popular in a wide variety ment. A system for
Dof bonding applications, most notably dispensing them needs to
locking together threaded parts like nuts and bolts be made of inert material,
or joining a bearing onto a shaft. Many of these preferably plastic components,
processes are workshop based and done by tubing and nozzles or needles.
manual application, but there are instances Metal dispense tips or pressure pots
when a more exacting approach is pose a contamination problem for
needed; for example in a non-manual anaerobic adhesives. Blockages can
automated assembly process, like occur in plastic hosing of small diameter
automotive magnet bonding, or the when left overnight as the anaerobic
production of form-in-place adhesive may gel.
sealing gaskets where a
profiled 3D bead is required. Precision dispensing
Anaerobic adhesives cure The preeflow eco-PEN is a precision volumetric,
under the absence of positive displacement, dosing/dispensing system
oxygen and in the that gives the user accuracy and repeatability by
presence of metal ions, means of a rotor, which turns inside a stator. By
and in these conditions this progressive cavity pump technology, the eco-
they cure quite PEN doses and dispenses a wide range of
quickly — usually material viscosities with no stress to the material,
advantageous, but providing absolute control. Numerous long-term

September 2020 • INDUSTRIAL TECHNOLOGY EXTRA • p10