N026
Performance
of Breath-Synchronized PAPR (2)
Takeshi
Honda*1, Satoshi Kuriyama*1, Hisashi Yuasa*1, Kazushi Kimura*1,
Hitoshi Emi*1,
Kousuke Nozaki*1 and Shigeru Tanaka*2
*1: Hanno Laboratory, Koken ltd
568
Kawadera, Hanno, Saitama
357-0044,
Tel: +81-429-74-0519 Fax: +81-429-74-3667
e-mail:
honda@koken-ltd.co.jp
*2:
ABSTRACT
Breath-Synchronized
Blower Mask (BL-50) has a mechanism that supply air synchronized with wearer’s
breathing pattern flow from a fan installed in the half mask. To evaluate the
efficacy of BL-50 in the real life, performance evaluation of BL-50 was carried
out using actual breathing pattern of worker at a dusty workplace. Breathing
pattern of the worker was recorded in Data Recorder through laminar flow meter. Then, the obtained data was passed to a
breathing machine in the laboratory to replicate the breathing pattern of
worker. Responsibility against the actual breathing pattern and protection
performance of BL-50 were examined using this flow condition.
The
study was conducted about blower’s ability to trace varying breathing patterns
as well as about blower’s ability to prevent inward leakages.
As a result, it was confirmed that the BL-50
synchronizes with irregular breathing patterns, and that excessive exhaust
resistance has been lessened.
At
the same time, inward leakage has been tested in a same manner. BL-50 was set on the dummy head to
simulate inward leakage due to poor face seal when blower is not activated. Then,
with blower on, there found almost no inward leakage. This shows BL-50 controls
internal mask pressure, and is considered to give a high protection performance.
The results of this study suggest that BL-50 not only improves the disadvantage
of conventional blower masks but also has high protection performance in
comparison with negative pressure particulate respirators.