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Case No.2
Paper dust ignited during repair work in
milling room of a paper manufacturing plant
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[Circumstances of Incident]
The accident occurred in the process
of tissue
milling and winding rolls (an intermediate
product) in a paper manufacturing
plant.
Following the instructions of an operations
chief to replace the cutter edge used
to
peel raw paper from the paper mill
dryer,
the victim turned on the switch to
rotate
the cylinder by compressed air and
cut the
raw paper by means of the cutter edge.
When the victim next tried to turn
on another
switch to start positioning the cutter
edge,
accumulated paper dust in a dust-collecting
system located between the dryer exit
and
the winding roll suddenly ignited,
injuring
the victim by the blast and heat from
the
flare-up.
Resulting fire was fed by floating
dust particles
(dust cloud) in the air and spread
throughout
the entire paper milling room.
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[Causes]
The following can be cited as the causes
of this accident.
1. Ignition causes
(1) Ignition of a paper dust layer
at a law
temperature
(2) Contact sparks from the dryer
(3) Friction sparks from the nozzle
and chain
of the dust collecting system
(4) Sparks due to static electricity
2.Concentration of dust, etc.
(1)The room humidity was partly below
15
percent.
(2)The dust-collecting system was designed
to release a large part of collected
air
after filtering.
(3)The dust-collecting method and capabilities
were inadequate, considering the accumulated
dust in the duct of the system
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[Type of business] Pulp/paper manufacturing
[Type of accident]Explosion
[Number of victims] One injured (not involving any absence from
work) |
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