[Offtopic] Particle Emission Characteristics of Printers
stephen at melbpc.org.au
stephen at melbpc.org.au
Sat Aug 4 04:18:52 EST 2007
Of the .. "40% of the printers that were emitters, 27% were classed as
high submicrometer particle emitters"
School printers may pose health risk.
Harmful particle emissions found in study of several common laser
printers .. According to a recently published study, some commonly used
printers are emitting toner particles. From eSchool News staff.
August 3, 2007Some of the laser printers used in classrooms, dorms, and
school administrative offices could pose serious health risks as a result
of the harmful emission of toner particles, according to a study by
Australian researchers. According to the study, released Aug. 1 by the
Queensland Department of Public Works ..
Environ. Sci. Technol., ASAP Article 10.1021
Web Release Date: August 1, 2007
Copyright © 2007 American Chemical Society
Particle Emission Characteristics of Office Printers
Congrong He, Lidia Morawska and Len Taplin. International Laboratory for
Air Quality and Health, Queensland University of Technology, Brisbane, QLD
and Queensland Department of Public Works, Brisbane, QLD 4001, Australia
Received / Revised / Accepted June 27, 2007
In modern society, printers are widely used in the office environment.
This study investigated particle number and PM2.5 emissions from
printers .. <snip>
The monitoring of particle characteristics in a large open-plan office
showed that particles generated by printers can significantly (p = 0.01)
affect the submicrometer particle number concentration levels in the
office .. <snip>
. 3.2. Printer Emission Investigation:
Following the above findings, an investigation into printer emissions in
the building was conducted. Based on the ratio of particle concentrations
measured immediately after the printer printed one page, compared to the
background office concentrations, the investigated printers were
catalogued into four different classes, in terms of their particle
emission levels, including:
non-emitters (ratio 1); low emitters (ratio >1 and 5), medium emitters
(ratio >5 and 10); and high emitters (ratio >10).
A total of 62 different printers were investigated, including various
models from CANON, HP COLOR LaserJet, HP LaserJet, RICOH, and TOSHIBA.
Table 1 presents a summary of the results of the printer emission
investigations, including printer brand and name, and the class of
It can be seen that 37 of the printers were non-emitters, 6 were low, 2
were medium, and 17 were high emitters.
Overall, 60% of the investigated printers were non-emitters and of the 40%
that were emitters, 27% were classed as high submicrometer particle
It can also be seen that the same model of a printer (in this case the HP
LaserJet 5) can act as either a non-emitter or a high emitter, and further
investigation should be conducted for this phenomena..
In summary, the chamber measurements confirmed that particle emissions
start immediately after the printer starts operating, and they showed that
in general, size distributions of the particles generated by the printer
are monodisperse. They also showed that particle number and size
Table One: <http://pubs.acs.org/cgi-
More information about the offtopic