Finishing - January-February 2020

36 BLAST CABINETS
Speedy clean
Guyson International has recently
installed a specially configured Guyson
Euroblast 7PF (Pressure Fed) blast
cabinet into one of the world’s leading
designers and manufacturers of switchgear
and instrumentation. The cabinet is to
provide a blast etched surface, on their range
of high voltage busbars, to improve adhesion
of a special non-conductive coating.
The company’s existing blast cabinet
system had suffered from several operational
problems, so the search was on for an
improved solution with better blast media
handling and operator efficiency. With three
tenders in place, the operators and
maintenance manager visited Guyson’s
‘component finishing centre’ at Skipton to try
out Guyson’s proposed manual blast system
on their components. “All of the operators
bought into the Guyson blast unit straight
away and it was their unanimous preferred
option” said their maintenance manager.
The chosen Euroblast 7PF blast cabinet is
from Guyson’s premier industrial quality
range and delivers exceptional component
access, with doors opening to the front, top
and side, and so facilitates easy loading of
components. In fact, with the blast chamber
being oblong rather than square in shape, it
proves a popular choice amongst customers
for blasting longer components. But due to
the length of some of their copper, silver and
tin electro-plated busbars being even longer
than the width of the Euroblast 7PF cabinet;
a special cabinet design was needed.
This was drawn up, in 3D CAD, by
Guyson’s in-house design team and
incorporated a
700 mm extension box on the left hand
side of the cabinet, supported by legs, and a
cut out profile in the right hand door (with
blanking door to prevent media escape) so
that longer busbars can be fed into the
cabinet for selective blast etching. The
remainder of the pressure fed blast system
includes a Guyson’s G27 pressure pot, C800
twin cartridge dust collector and a ‘High
Efficiency’ cyclone. This latter item is
designed to remove the majority of dust and
fines from reaching the dust collection unit,
thus extending the life of the filter cartridges
between changes.
Guyson Euroblast PF systems are designed
for speed, giving faster cleaning times (up to
four times faster than suction fed or venturi
systems) to meet higher production
requirements and at peak demand this blast
system can be working for the entire length
of a full shift so it is necessary that the blast
system quickly produces a perfectly keyed
surface for the powdered coating to adhere
to in the oven.
Finishing - January/February 2020