Pole manufacturing plant
A mechanised system of manufacturing, utilising a track
mounted winding machine onto which both the glass
filament rovings and resin bath are mounted, is applied.
The filament winding machine is operated at calculated
speeds whilst moving alongside the rotating mandrels to
achieve maximum winding angles.
BEKA Schréder GRP poles are manufactured through
the filament winding process whereby continuous glass
rovings are fed through a polyester resin bath and wound
at an even tension onto a rotating mandrel, resulting in
a mass to resin ratio of 70:30 and making full use of the
tensile strength of the glass filament which is more than
that of steel.
After the winding process has been completed, the glass
filament structure is cured and then removed from the
mandrel for surface preparation.
A base coat of polyester resin that complies with the
requirements of SANS 1749 is applied, thereafter the
cured structure is further machined to receive a final gel
coat that is applied to a uniform thickness of between
250 and 500 microns.
In the mechanical assembly process, the pole is
machined to provide holes for base plate hookbolts,
cable entries, access door openings, as well as any other
details required. Spigot arrangements and surface base
plates, where required, are moulded into the pole and
secured in position with locking screws.
Throughout the manufacturing process, the pole is
subjected to stringent quality checks and tests.
Winding of glass filament Precision quality inspection Machining of cured pole Access door detail