| The Analysis Of Phenomenon Of Pre-frothing |
| Phenomenon |
|
Analysis |
|
Measure |
| 1.Caking |
 |
hign temperature or uneven in pre-frothing
equipment |
|
reduce the stream pressure of pre-forthing |
 |
|
|
bed stirring effect in pre-frothing equipment |
|
increase stirring spead and improve stirring
structure |
|
|
|
no enough air |
|
increase enough air |
|
|
|
the raw material stored too long |
|
avoid storing raw material for too long time |
|
|
|
lack of liniment or not right proportionality |
|
put right amount of zinc stearate over 200 mesh |
|
|
|
hign temperature |
|
decrease stream pressure of pre-frothing |
|
|
|
2.Moist particles of
pre-frothing |
|
high water content of pre-frothing stream |
|
strength keeping of stream pipe,place stream
trap |
|
|
|
bad pre-frothing warmth-keeping |
|
strength warmth-keeping |
|
|
|
bad ventilation at the top of pre-frothing equipment |
|
inform the air conduit for stream escaping on
the top-
cover |
|
|
|
too much antistatic agent in raw material |
|
improve production plant to reduce antistatic
agent or
use better water-soluble agent |
|
|
|
3.Low-foaming
times |
|
long storage time of law material escaping of
foaming agent |
|
earlier use of low material which is bought
earlier,put
it in the cool place and use it within
the preserving
time |
|
|
|
low pre-frothing stream pressure or low
temperature |
|
increase stream pressure like opening widely
the
stream vaive |
|
|
|
the stream hole of foaming agent is blocked up |
|
clear the stream hole |
|
|
|
too fast feeding speed of raw material,too short
staying time |
|
decrease the feeding speed or raise the height
of outlet |
|
|
|
too much water stick on the surface of the raw
material |
|
test the water content of the raw material |
|
|
|
4.Pre-frothing
particles' creasing
and shrinking |
|
a little higher for frothing times |
|
right reduce frothing times adopt two times pro-
frothing so as to raise the frothing times |
|
|
|
temperature difference is too big,cooling is too fast |
|
when room temperature is low,use hot air to
remove
the raw material or increse fluidized
bed drying
system or reduce wind |
|
|
|
stream pressure is too high,the temperature is a
little higher |
|
volume so as to reduce the removing speed for
raw
material reduce the stream pressure or
turn down
stream inlet valve |
|
|
|
long staying time for frothing particles |
|
reduce the height of the outlet or increase the
feeding
speed of the inlet |
|
|
|
uneven particles |
|
use even-particles raw material instead |
|
|
|
mixing of nerw and old raw material |
|
use the same material as possible |
|
|
|
a little higher for frothing agent content |
|
open the package let the frothing agent to
escape
before use |
|
|
|
5.Pre-frothing-
particle's bad shape |
|
stirring fans is hurt |
|
adjust stirring fans' place |
|
|
|
air-blower's fans is hurt |
|
use spraying pipe to remove raw material |
|
|
|
bad shape particles in raw material |
|
inform the production plant |
|
|
|
6.Diffcult to control
the frothing times |
|
uneven feeding speed |
|
check whether the spiral machine is blocked up
the
low material |
|
|
|
unstable stream pressure |
|
is too moiset,cool it dried then use |
|
|
|
mix the new and old raw material |
|
check the stream-pipe system |
|
|
|
too frash raw-material |
|
use the same material as possible |
|
|
|
7.Frothing particles'
creasing and
shrinking |
|
no enough time for the frothed particles to be
mature |
|
store a few days before use right prolongs
mature time
according to room temperature |
|
|
|
a little higher temperature |
|
generally,froth two times after pre-frothing for 8
hours |
|
|
|
pre-frothing times a little higher |
|
reduce stream pressure or turn down stream
inlet
valve |
|
|
|
pre-frothing particles are hurt when removing with
wind |
|
reduce pre-frothing times check wind-removing
system,make sure pipe-wall is smooth |
|
|
|
8.The density is up
after being mature |
|
frothing particles shrink too much |
|
the angle for air-blower's fans is normal |
|
|
|
room-temperature a little lower |
|
reduce pre-frothing times |
|
|
|
not enough mature-time |
|
increase mature-time |
|
|
|
pre-frothing particles are hurt when removing with
wind |
|
increase mature-time |
|
|
|
| The Analysis For Shaping |
| Phenomenon |
|
Analysis |
|
Measure |
| 1.Bad bingding |
|
no enough time for heating |
|
prolong heating time or increase stream
pressure |
|
|
|
too high stream pressure |
|
prolong heating time or increase stream
pressure |
|
|
|
too long for mature-time |
|
reduce mature-time for 6 to 24 hours |
|
|
|
frothing particles'water content is too high |
|
blow cool-air to dry,prolong mature-time but no
more
than 24 hours |
|
|
|
moist stream,high water content |
|
remove the water from the stream |
|
|
|
frothing times is too high |
|
control the frothing times from being too high |
|
|
|
bad mould |
|
check whether the stream hole of mould is
blocked up;
whether accumulated filth in stream
room do harm to
heat-transfer. The mould is
not tight, the stream is
escaping |
|
|
|
2.Bad mould
unloading |
|
too long heating time |
|
reduce heating time |
|
|
|
3.Surface shrinking
of the products |
|
too high temperature |
|
reduce stream pressure |
|
|
|
not enough cooling |
|
increase cooling water, prolong cooling time |
|
|
|
rough mould surface |
|
coat mould-unloading agent or smooth the
surface |
|
|
|
4.Bad binding-
appearance of
products (even) |
|
too long heating time |
|
reduce heating time |
|
|
|
steam pressure is too high |
|
reduce stream pressure |
|
|
|
cooling too fast |
|
increase the temperature of cooling water,
reduce
cooling water, prolong cooling time |
|
|
|
no enough mature-time |
|
prolong mature-time from 6-24 hours |
|
|
|
not enough feeding or uneven feeding |
|
check whether the feeding inlet is blocked up,
increase
the prssure of the compressed air,
prolong feeding-
time increase mould's space
or use smaller pre-frothing particles instead |
|
|
|
frothing times is too high |
|
adjust frothing times |
|
|
|
5.Expanding of the
shaped products |
|
uneven feeding |
|
check whether the feeding inlet is blocked up,
increase
the pressure of the compressed air,
prolong feeding-
time increase mould's space
or use smaller pre-
frothing particles instead |
|
|
|
too much accumulated water in the mould |
|
prolong discharging time, increase blowing and
discharging stream or air |
|
|
|
uneven cooling and heating of the mould |
|
check whether the stream hole is blocked up,
increase
the stream hole |
|
|
|
not enough time for frothing |
|
prolong mature-time |
|
|
|
particles to be mature no enough cooling or uneven |
|
prolong mature-time, increase cooling water,
check the
condition of the component |
|
|
|
6.Good surface
binding but bad part
inside |
|
too high stream pressure, too fast heating speed |
|
reduce stream pressure, prolong heating-time |
|
|
|
no enough mature-time |
|
prolong mature-time |
|
|
|
moist pre-frothing particles |
|
forced-circulating cooling to dried |
|
|
|
frothing times is too low, old law-material |
|
increase frothing times with new law-material |
|
|
|
too much liniment |
|
inform production plant to reduce the liniment |
|
|
|
