Experimental and results
Recycle toners (toners C and E) were examined in the
following test items which evaluate dust explosion
characteristics5.
1. Lower limit of explosion
To measure the lower explosive limit of toner, we used
an instrument which follows JIS Z 8818:2002 (Methods
for determining the lower limit of explosion of
combustible powder), a Hartmann measurement unit
(inner diameter; 70 cm, volume; 1.2 L) was used. There
are two ways to obtain dust cloud; fall down type and
blow up type. Here we used blow up type, and
attempted to ignite with the arc discharge of alternating
current. The lower concentration limit for explosion (g/
m3) is one of the most fundamental parameters, and
shows easiness of explosion. Test results are 65 g/m3,
75 g/m3 for Toner C and E respectively, and are
consistant with Nifuku et al.’s toner data (70 g/m3).
These values are similar to those of coal, plastics, which
make dust explosions.
Experimental and results
Recycle toners (toners C and E) were examined in the
following test items which evaluate dust explosion
characteristics5.
1. Lower limit of explosion
To measure the lower explosive limit of toner, we used
an instrument which follows JIS Z 8818:2002 (Methods
for determining the lower limit of explosion of
combustible powder), a Hartmann measurement unit
(inner diameter; 70 cm, volume; 1.2 L) was used. There
are two ways to obtain dust cloud; fall down type and
blow up type. Here we used blow up type, and
attempted to ignite with the arc discharge of alternating
current. The lower concentration limit for explosion (g/
m3) is one of the most fundamental parameters, and
shows easiness of explosion. Test results are 65 g/m3,
75 g/m3 for Toner C and E respectively, and are
consistant with Nifuku et al.’s toner data (70 g/m3).
These values are similar to those of coal, plastics, which
make dust explosions.
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