Solid material comminution or disintegration – Processes – With heating or cooling of material
Reexamination Certificate
2001-10-02
2004-05-04
Rosenbaum, Mark (Department: 3725)
Solid material comminution or disintegration
Processes
With heating or cooling of material
C241S029000, C241S065000, C241S152200
Reexamination Certificate
active
06729565
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a process and processor for reusing a waste paint discharged from processes such as coating process of applying paint to a vehicle body.
2. Description of the Related Art Including Information Disclosed under 37 CFR 1.97 and 1.98
For instance, in a paint shop, a vehicle body is painted out by spraying coatings in a paint booth. In spraying coatings, there is some coating liquid which is not adsorbed onto the vehicle body due to spray missing (overspray). The missing spray coating enters into circulating water in a pit on the lower side of the booth, and is led to a settling (precipitation, deposit) tank together with the water. After some time period, soft cake-like masses settle and these are collected as waste paints. The waste paint is burnt up, or otherwise is dried and ground as a processed waste paint which is generally used for asphalt sheets and chipping resistant coatings.
However, the waste paint collected in the paint booth is not cured because it is not passed through a curing process. Therefore it is necessary to completely cure the waste paint to pulverize it for its reuse.
Examples of processors for drying and pulverizing the waste paint include a screw drying machine, a stirring drying machine and a rolling drying machine. Methods for processing the waste paint by using the screw drying machine, the stirring dryer and the rolling dryer are explained below.
FIG. 4
is a schematic view for explaining the screw drying machine. In the screw drying machine
100
, the waste paint placed in a hopper
101
is introduced into a screw dryer
105
by a screw conveyor
102
and a belt conveyor
103
, and dried in the screw dryer
105
to be pulverized, whereby the waste paint can be converted into resources.
The screw dryer
105
is provided with a cylindrical processing tank
106
into which the paint waste is introduced by the belt conveyor
103
, a rotating grinding rotor
107
having plural grinding rotors
107
b
mounted on a rotating axis
107
a
which is horizontally extended in a processing tank
106
, and a screw conveyor
108
disposed on the lower side of the processing tank
106
.
When the waste paint is introduced into the processing tank
106
, the grinding of the waste paint is started by rotation of the rotating grinding rotor
107
, and simultaneously its heating is started by steam. In the process of heating of the waste paint, the waste paint is melted to form a large mass having high viscosity (e.g., heated rice cakes). In this condition, the heating promotes the vaporization of a solvent in the waste paint to dry out the waste paint.
When the waste paint is heated, the curing of a resin component in the waste paint is proceeded, and as a result the cured waste paint is ground by the rotating grinding rotor
107
. The ground waste paint (i.e., resin powder) is fed as resources from the lower side of the processing tank
106
by the screw conveyor
108
.
On the other hand, the water and solvent contained in the waste paint are vaporized in the processing tank
106
, and the vaporized water and solvent are liquefied or condensed by a heat exchanger
109
to be discharged as condensed liquid. In this case, hydrocarbon is removed and only nontoxic gas is discharged. A reference number
109
a
is a vacuum pump for reducing pressure in the heat exchanger
109
.
FIG. 5
is a schematic view for explaining the stirring and drying machine. In the stirring and drying machine
110
provided with a stirring dryer
115
, the waste paint placed in a hopper
101
is introduced into the stirring dryer
115
by a screw conveyor
102
and a belt conveyor
103
in the same manner as the screw drying machine
100
, and similarly dried in the stirring dryer
115
to be pulverized, whereby the waste paint is converted into resources.
The stirring dryer
115
is provided with a cylindrical processing tank
116
having a bottom into which the paint waste is introduced by the belt conveyor
103
, a rotating grinding rotor (grinder)
117
with grinding rotors
117
b
mounted on a rotating axis
117
a
which is perpendicularly extended in the processing tank
116
, and an outlet
118
disposed on the lower side of the processing tank
116
.
When the waste paint is introduced into the processing tank
116
, grinding of the waste paint is started by rotation of the rotating and grinding rotor
117
, and simultaneously its heating is started by the steam. In the course of heating the waste paint, the waste paint is melted to form large masses having high viscosity (e.g., heated rice cakes). In this condition, the heating promotes the vaporization of a solvent in the waste paint to dry out the waste paint.
When the waste paint is heated, the curing of a resin component in the waste paint is proceeded, and as a result the cured waste paint is ground by the grinding rotor
117
. The ground waste paint (i.e., resin powder) is fed as resources from the outlet
118
provided on the lower of the processing tank
116
.
Water and solvent contained in the waste paint are vaporized in the processing tank
116
, and the vaporized water and solvent are liquefied or condensed by a heat exchanger
109
to form condensed liquid in the same manner as the screw drying machine
100
, and hydrocarbon is removed to discharge only nontoxic gas into atmosphere.
FIG. 6
is a schematic view for explaining the rolling drying machine. In the rolling drying machine
120
having a rolling dryer
121
, waste paint placed in a hopper
101
is introduced into the rolling dryer
121
by a screw conveyor
102
and a belt conveyor
103
in the same manner as the screw drying machine
100
, and similarly dried in the rolling dryer
121
to be pulverized, whereby the waste paint is converted into resources.
The rolling dryer
121
is provided with a box-shaped processing tank
122
into which the paint waste is introduced by the belt conveyor
103
, a pair of rotating drums
123
which are horizontally disposed opposite to each other in the processing tank
122
and which rotate in the opposite direction each other, a scraper blade
124
whose edge is contact with the surface of each of the drums
123
, and a screw conveyor
125
disposed on the lower side of the processing tank
122
.
A large mass of waste paint, which is introduced from the upper side of a processing tank
122
, is fed between a pair of rotating drums
123
opposite to each other, rolled therebetween under heating, whereby drying and grinding are started. The rolled and dried waste paint is adhered onto the surface of the rotating drums
123
to be moved by rotation of the drums, and scratched up by the scraper blade
124
. The scratched waste paint is fallen from the drums
123
and fed as resources from the lower side of the processing tank
121
by the screw conveyor
125
.
Water and solvent contained in the waste paint are vaporized in the processing tank
121
, and the vaporized water and solvent are liquefied or condensed by a heat exchanger
109
in the same manner as the screw drying machine
100
, and hydrocarbon is removed to discharge only the nontoxic gas into the atmosphere.
SUMMARY OF THE INVENTION
According to a method for processing the waste paint using the screw drying machine shown in
FIG. 4
, the collected waste paint is stirred under heating by the rotating grinding rotor
107
within the processing tank
106
and therefore it is gradually cured. In a beginning stage of the curing, the waste paint is increased in viscosity to become high viscous (such as in the condition of heated rice cake), and therefore resistance for rotating of the rotating grinding rotor
107
is increased and subsequently power for driving the rotor (e.g., consumed power of electric motor) is also increased. For the reason, it is required to switch the rotation number (speed) of the rotating grinding rotor
107
to a low rate and much time is taken for reduction of water content of the waste paint.
Also in the method for processing the waste paint using the stirring and
Kawaguchi Takayuki
Sonehara Kuniya
Yamakawa Tomihisa
Fuji Jukogyo Kabushiki Kaisha
Rosenbaum Mark
Smith , Gambrell & Russell, LLP
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