Solid material comminution or disintegration – Processes – With heating or cooling of material
Reexamination Certificate
1999-07-26
2001-11-06
Tolan, Ed (Department: 3725)
Solid material comminution or disintegration
Processes
With heating or cooling of material
C241S024120, C241S068000, C210S770000, C034S384000, C034S423000
Reexamination Certificate
active
06311906
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to waste paint generated during a painting operation and more particularly to apparatus and method for recycling waste paint to dry up the waste paint containing an amount of toxic substances in a vacuum dry method and completely remove water from the waste paint.
2. Description of Related Art
Typically, paint contains pigment, organic matter, inorganic matter, a drier, an additive, and resin. The paint has various physical properties in accordance with usage and contains an amount of water and thinner, thus having its unique smell. If waste paint generated during a painting operation is discharged as it is, it may cause environmental pollution such as air pollution, soil pollution, marine pollution, and water pollution, so it is defined as a particular toxic substance.
In a conventional treatment method, the waste paint is collected and burned up. However, this incineration of the waste paint costs a great deal and generates an amount of volatile organic compounds (VOC), causing secondary pollution.
To overcome the above problems, there have been developed methods and apparatus for recycling the waste paint. The method and apparatus for recycling the waste paint is disclosed in the application Ser. No. 96-6501 filed in Korea (the title of the invention is “Method and Apparatus for recycling waste paint”) in detail. Specifically, in a course of drying up the waste paint, electromagnetic wave generated by a magnetron is used as a primary energy source and hot air generated by a hot blast stove is used as a secondary energy source to remove water from the waste paint.
However, the above method and apparatus for recycling waste paint using the electromagnetic wave does not allow mass production and good drying. Moreover, a terrible smell that is given off by drying of the waste paint and fillers generated from the recycling process not only ruins worker's health but also causes environmental pollution. The fillers cannot be reused because the conventional recycling method of waste paint cannot remove a terrible stink from the fillers.
SUMMARY OF THE INVENTION
Accordingly, the present invention is directed to apparatus and method for recycling waste paint that substantially obviates one or more of the limitations and disadvantages of the related art.
An objective of the present invention is to provide apparatus and method for recycling waste paint, which removes a bad smell generated in the course of drying up the waste paint.
Another objective of the present invention is to provide apparatus and method for recycling waste paint, which dries up the waste paint using a vacuum dry method, thereby reducing secondary pollution and allowing mass production.
Still another objective of the present invention is to provide apparatus and method for recycling waste paint, which removes a bad smell from fillers, thereby allowing reuse of the fillers.
Additional features and advantages of the invention will be set forth in the following description, and in part will be apparent from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure as illustrated in the written description and claims hereof, as well as the appended drawings.
To achieve these and other advantages, and in accordance with the purpose of the present invention as embodied and broadly described, a method for recycling waste paint comprises the steps of: shaping the waste paint into a cake of a predetermine thickness while removing water from the waste paint using centrifugal force of a dehydrator; drying up and dehydrating the cake-shaped waste paint at about 80° C.~300° C. using a twin screw extruding method to remove water; drying up the waste paint dried up at the above step at about 100° C.~300° C. using a vacuum dry method to remove remaining water; pulverizing the waste paint dried up by the vacuum dry method into minute powder; separating the pulverized waste paint based upon density; and collecting and discharging dust, vapor, and gas generated during the above steps.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory and are intended to provide further explanation of the invention as claimed.
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patent: 5765293 (1998-06-01), St. Louis et al.
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patent: 5954970 (1999-09-01), St. Louis
Jacobson & Holman PLLC
Sam Sin Mechanical Engineering Co., Ltd.
Tolan Ed
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