Transcript GELUID

Noise
In textile and
garment factories
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Hearing loss
Deafness due to a sudden loud noise may
cause temporary of permanent deafness.
Noise-induced deafness is permenent and due
to exposure of workers to 80 decibels for an
eight-hour day
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Noise induced
hearing loss (NIHL)
 Acoustic signal enters auditory canal, via the stapes
footplate hammering to the clochea. This hammering
causes the fluid within the clochea to push against the
ste hair cells.
 Hair cells then transmit a signal to the auditory system
within the brain.
Cochlea
 Ear exposure to excessive sound levels
overstimulates the hair cells, leading to cell death.This
is irreversible!!!
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Harmful noise
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What are we talking about?
Facts & Figures:
 25% of the Dutch workers are exposed to
harmful noise.
 We talk about 1.750.000 human beings!
 Estimated 250.000 people of mentioned
group already have permanent hearing loss.
(Source: CBS and Ministry of Social Affairs,
Association of Work related diseases FNV).
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Noise standard
 Maximum 80 decibels for an eight-hour day is
the recommended health standard.
 A rough measure of whether the noise in
which you work is too loud or not is to note
whether you have to shout to be heard when
you are about 30cm from other person’s ear
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International labour law
Obligations above 85 decibel:
 Employers need to take measures at the
noise source
 Workers are obliged to wear hearing
protection given by their employer
 Mark noise area’s
 Hearing test
 Education and training
 Hearing conservation program
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Maximum exposure time
With every 3 dB the amount of noise energy
doubles while the health exposure time decreases
with 50%.





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80 decibel
83 decibel
86 decibel
89 decibel
92 decibel
95 decibel
8 hours a day
4 hours a day
2 hours a day
1 hour a day
1/2 hour a day
1/4 hour a day
A difference of 3 dB(A) is hardly to perceive!!
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Geluidniveaus
dB(A)
At work
Private situation
130 Saw with diamant blade
120 Chain saw
Low flighing fighter jet
110 circular saw
Rock band
100
electric hand drill,
compressor,
90 Cutting torch, hand saw
Passing train on a railway
station
80 Along the highway
70 Moderate office
Vacuum cleaner
60 normal speech level
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Results noise measurement
 factory 1:
6 production lines >80 dB(A)
2 production lines >85 dB(A)
 factory 2:
5 production lines > 80 dB(A)
3 production lines > 85 dB(A)
400 to 500 workers at risc!!
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Locations were there are
noise problems
Noise source
Noise range dB(A)
dB(A) in the ear*
Slicing machine
83,1 – 85,9
67
Grater block
92,8 - 92,7
74
Box cleaning unit
82,3 – 85,1
64
Boxes in dish
washer
87,9 – 90,4
70
Boxes out of dish
washer
86,6 – 89,8
70
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After hearing
protection
DuoFit® Sonar®
Causes
 Several production lines next to each other at
work
 Radio increases noise level with + 2,5 dB(A)
 The sum of a lot of smaller noise sources in
the same work place or production line
 Overdue maintenance production lines and
equipment
 Contact noise steel boxes on the cutting
machine
 Lack of isolation and noise absorbing shields
at the pulverize machine
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Protection measures
 Above 80dBA: take measures
 Thumb rule: if you can hear each other while
speaking without raising your voice on one
metre distance, noice level is below 80 dB(A)
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Ear muffs
Worn out!
With radio and
communication
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Ear plugs
Right
Wrong
Uniplug
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Otoplastics
Custom made
Types: ER-9, ER-15 en ER-25.
Typenumber indicates demping in dB(A).
Good speech intelligibility
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Reducing moise levels at the
source
 Acquire silent machines and equipment
 Reduce noise leakage from inside machines
 Periodical maintenance of machinery and
equipment
 Balance rotating parts
 Reduce friction and resistance
 Isolate/damp vibration
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Organizational measures
 Purchase and replacement policy
 Changes to work schedule or operations
based on exposure to harmful noise
 Use noise absorbing materials in the work
space like baffles on the ceiling
 Place sound barriers around noisy
production lines
 Consider refurbishment to reduce noise
levels
 Mark noisy area’s
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More self measures!
 Discuss what measures are available to prevent
noise deafness with you safety officer or manager
 Agree rules of conduct
 Wear fitting hearing protection constently
 Help to remind each other to wear hearing
protection
 Turn off the radio in noisy area’s
 What counts at work, counts at home!
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Hearing protection
 The best hearing protection is the one the
employee will wear consistently and
correctly!
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Because..........
Hearing loss caused by noise can
never be cured
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