Apparatus for separating plastic chips
AssigneeHitachi Zosen Corporation
InventorsHiroyuki Daiku, Masanori Tsukahara, Tetsuya Inoue, Hidehiko Maehata
Life of this patent
Estimating the term…
Abstract
A first and second electrostatic sorting sections are arranged below a tribo-electrifying device in this order in a vertical direction to form a sorting electrostatic field between a drum electrode and an opposing electrode. Plastic pieces separated from the other plastic pieces by the sorting electrostatic field in the first electrostatic separating section are introduced into a sorting electrostatic field in the second electrostatic separating section for second separation, thereby increasing the separation purity and recovery rate of plastic pieces.
Claims7
A plastic sorting apparatus, comprising:
- a tribo-electrifying section for causing plural types of plastic pieces to frictionally contact with one another for electrification;
- and
- an upper-stage electrostatic separating section, a lower-stage electrostatic separating section and a recovery section all of which are located below the tribo-electrifying section downwardly in this order,
- wherein
- the upper- and lower-stage electrostatic separating sections each comprises a metallic rotationally-movable electrode having a top portion onto which plastic pieces are fed, an opposing electrode located to oppose a portion of the rotationally movable electrode which moves rotationally downward, and a high-voltage power supply that applies a high voltage to said rotationally movable electrode and opposing electrode to form a separating electrostatic field therebetween,
- a connection section is provided for feeding plastic pieces separated toward the rotationally movable electrode in the upper-stage electrostatic separating section to the rotationally movable electrode in the lower-stage electrostatic separating section, and
- polarities applied by the high-voltage power supply respectively to the rotationally movable electrode and the opposing electrode in the upper-stage electrostatic separating section are opposite to those in the lower-stage electrostatic separating section.
A plastic sorting apparatus, comprising:
- a tribo-electrifying section for causing plural types of plastic pieces to frictionally contact with one another for electrification;
- and
- an upper-stage electrostatic separating section, a lower-stage electrostatic separating section and a recovery section which are arranged below the tribo-electrifying section downwardly in this order,
- wherein
- the lower-stage electrostatic separating section includes therein a lower-stage first electrostatic separating section to which plastic pieces separated toward the rotationally movable electrode in the upper-stage electrostatic separating section are fed via a connection guide section, and a lower-stage second electrostatic separating section to which plastic pieces separated toward the opposing electrode in the upper-stage electrostatic separating section are fed,
- the upper-stage electrostatic separating section and the lower-stage first and second electrostatic separating sections each comprises a metallic rotationally-movable electrode having a top portion onto which plastic pieces are fed, an opposing electrode arranged to oppose a portion of the rotationally movable electrode which rotationally moves downward, and a high-voltage power supply that applies a high voltage to the rotationally movable electrode and the opposing electrode to form a separating electrostatic field therebetween,
- the polarity of a high voltage applied to the upper-stage electrostatic separating section by the high-voltage power supply thereof is opposite to the polarity of a high voltage applied to the lower-stage first electrostatic separating section by said high-voltage power supply thereof, and
- the polarity of a high voltage applied to the upper-stage electrostatic separating section by said high-voltage power supply thereof is the same as the polarity of a high voltage applied to the lower-stage second electrostatic separating section by said high-voltage power supply thereof.
The plastic sorting apparatus according to claims 1 and 5, wherein the rotationally movable electrode comprises a cylindrical drum electrode located to be rotatable around a horizontal axis.
Dependencies are inferred from the claim text.