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Caught between plug table and unit frame
during repair work on a plastic molding machine
|[Circumstances of Incident]
The accident occurred at a plant that
molded plastic products.
The plant operates on a 24-hour continuous
basis, with three working shifts per
On the day of the accident, the victim
working the night shift and was responsible
for operating two plastic molding machines
with the assistance of two foreign
who were employed by an in-site subcontractor.
At around 30 minutes after midnight,
victim and the two foreign workers
the die in the molding machine. When
work was completed, the victim gave
to the two workers to prepare the sheets
of plastic material, etc., and entered
inside of the machine.
After about 15 minutes had elapsed,
of the victim could be heard calling
need air!" followed moments later
a loud cry of "Air, air, air!"
The two workers ran to where they heard
voice. The victim, his chest caught
the plug table and the unit frame inside
the machine, was lying on his stomach
his arms outstretched.
One of the two workers who had rushed
the site was quick witted enough to
the machine's main compressed air supply
valve, causing the plug table and the
die to lift and release the victim.
the victim's chest was heaving up and
as he tried to suck air into his lungs,
breathing had stopped after about
The following can be cited as the causes
of this accident.
1 It is assumed that when the victim
the molding machine, he leaned the
part of his torso under the plug table,
to carry out replacement work and was
the controller when the plug table
die descended, trapping him by the
between the plug table and the unit
2 The reason the plug table, etc.,
was because the victim closed the valve
the main pipe that supplies compressed
to the molding machine. In other words,
machine employed a mechanism whereby
plug table, etc., are raised and held
the upper dead point by compressed
descend by their own weight when the
3 It is assumed that the reason the
closed the main compressed air supply
was the fear that compressed air would
gush out when the controller was removed.
|[Type of business] Plastic products manufacturing
[Type of accident]Caught
[Number of victims] One fatality