Method and apparatus for removing fine particles from synthetic resin pellets
AssigneeTeijin Chemicals, Ltd.
InventorsAkira Kazamoto, Yoshiaki Oishi
Life of this patent
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Abstract
Fine particles which electrostatically adhere to synthetic resin pellets are separated from the pellets by bringing the pellets/fine particles mixture into contact with an ionized gas. The ionized gas eliminates the electrostatic adhesion between the synthetic resin pellets and the fine particles. The resulting fine particles may thereafter be readily separated from the pellets and the freed fine particles may be withdrawn in a gas stream. Removal of the fine particles to less than 40 ppm is possible. Apparatus for carrying out the method is also described as is a system for stocking synthetic resin pellets using the described apparatus.
Claims14
A method for removing fine particles electrostatically adhering to synthetic resin pellets from a particle mixture of synthetic resin pellets containing fine particles, said method comprising:
- (a) subjecting a gas to an ionization treatment to obtain an ionized gas;
- (b) contacting the mixture of the synthetic resin pellets containing the fine particles with the ionized gas to eliminate the electrostatic adhesion between the synthetic resin pellets and the fine particles to thereby obtain fine particles free from electrostatic adhesion;
- and
- (c) separating the resulting fine particles free from electrostatic adhesion from the synthetic resin pellets.
A method for removing fine particles electrostatically adhering to a synthetic resin pellet from a particle mixture of synthetic resin pellets containing fine particles which comprises:
- (a') subjecting a gas to an ionizing treatment to obtain an ionized gas;
- (b') causing the mixture of synthetic resin pellets containing the fine particles to flow downwardly into countercurrent contact with an upwardly flowing gas mixture containing a mixture of non-ionized gas and said ionized gas to thereby eliminate the electrostatic adhesion between the synthetic resin pellets and fine particles;
- and
- (c') conveying the resulting fine particles free from electrostatic adhesion with the gas mixture such that the fine particles free from electrostatic adhesion are separated from the downwardly flowing synthetic resin pellets.
An apparatus for removing fine particles from a particle mixture of synthetic resin pellets containing the fine particles electrostatically adhered thereto, said apparatus comprising:
- (a) a conduit-like structure providing a synthetic resin falling path which is bent in at least one position,
- (b.sub.1) a feed inlet for feeding said mixture to an upper portion of the synthetic resin falling path;
- (b.sub.2) a gas exhaust port situated in the vicinity of said feed inlet;
- (c.sub.1) a discharge outlet for discharging the synthetic resin pellets from a lower portion of the synthetic resin falling path;
- (c.sub.2) a port for blowing a non-ionized gas, said port being situated in the vicinity of said discharge outlet;
- and
- (d) a plurality of openings for blowing ionized gas, wherein each of said openings in said plurality of openings is connected to a source of ionized gas whereby ionized gas may be introduced into the conduit-like structure along the length of the synthetic resin falling path.
An apparatus for removing fine particles from a particle mixture of synthetic resin pellets containing the fine particles electrostatically adhered thereto, said apparatus comprising a tower having
- (a'.sub.1) a feed inlet for feeding the mixture, said inlet being situated in an upper portion of the tower,
- (a'.sub.2) a gas exhaust port situated in the vicinity of the inlet;
- (b'.sub.1) a discharge outlet for discharging synthetic resin pellets, said outlet being situated in a lower portion of the tower;
- (b'.sub.2) a port for blowing non-ionized gas, said port being situated in the vicinity of the discharge outlet;
- (c') at least two baffles mounted within the tower and forming a bent flow path for the synthetic resin pellets;
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- (d') a plurality of openings for blowing an ionized gas, each of said openings inside said plurality of openings being connected to a source of ionized gas and said openings being situated along the length of the tower for blowing the ionized gas in the direction towards the falling flow path of synthetic resin pellets falling through said bent flow path.
Dependencies are inferred from the claim text.