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JOHN DANIEL HOLDINGS LIMITED AND ITS SUBSIDIARIES
INTEGRATED ANNUAL REPORT 2011
Vinguard Limited is a public company registered in the Re-
public of South Africa and has in excess of 300 sharehold-
ers many of whom are table grape industry participants.
Vinguard Limited is a subsidiary of John Daniel Holdings
Limited.
The primary product of Vinguard is an insert used
when packaging table grapes, which eliminates fun-
gal infections and prolongs the shelf life of the grapes.
The Vinguard
TM
two stage SO
2
generating sheet was
developed over a period of 7 years at Stellenbosch Uni-
versity and has been in commercial use globally for four
years. The research was conducted in conjunction with
the South African Deciduous Fruit Producers Trust and
local table grape farmers. The technology that flowed
from this research was both new and innovative, utilis-
ing current and up to date knowledge in the fields of
polymer science and membrane transfer theory, with a
key focus on minimising SO
2
residue levels. Thus the Vin-
guard
TM
two stage SO
2
generating sheet is the most ad-
vanced SO
2
generating sheet on the international mar-
ket in the view of the directors.
The Vinguard manufacturing facility contains a one of a
kind, fully automated plant capable of manufacturing in
excess of 40 000 000 sheets per annum. The plant was
designed and built by Vinguards’ in-house team of engi-
neers and polymer scientists in conjunction with leading
experts in the fields of mechanical, electronic and electri-
cal engineering, production flow logistics, heat transfer
technology and flow dynamics.
The manufacturing process contains both automated
and manual quality control tests designed to ensure that
each and every Vinguard
TM
two stage SO
2
generating
sheet is produced according to specification.
Two-stage release and SO
2
residues
The Vinguard two stage SO
2
gas generating sheet rep-
resents the latest technology in the field of controlled
release. SO
2
gas is released through a monolithical re-
lease mechanism, similar to release systems used in the
pharmaceutical industry, and can be controlled and ma-
nipulated to suit any client’s specific requirements.
High SO
2
residue levels on table grapes are unaccept-
able to both the global table grape consumer and more
and more often to governments and regulating bodies
around the world. Retailers are continually striving to
Vinguard Limited