Abstract: A system for removing a thin metal film is disclosed. The system comprises an inclined metal plate electrode for guiding a downward electrolyte flow, an auxiliary electrode placed on either the upstream or downstream side of the metal plate electrode such that a part of the auxiliary electrode is immersed into the electrolyte, and a power supply for applying a DC voltage to the both electrodes. The system is used to remove a metal thin film on the surface of an insulator by making the electrolyte flowing down the metal plate electrode strike against the metal thin film while the DC voltage is applied to the metal plate electrode and auxiliary electrode.

Abstract: A system for removing a thin metal film is disclosed. The system comprises an inclined metal plate electrode for guiding a downward electrolyte flow, an auxiliary electrode placed on either the upstream or downstream side of the metal plate electrode such that a part of the auxiliary electrode is immersed into the electrolyte, and a power supply for applying a DC voltage to the both electrodes. The system is used to remove a metal thin film on the surface of an insulator by making the electrolyte flowing down the metal plate electrode strike against the metal thin film while the DC voltage is applied to the metal plate electrode and auxiliary electrode.

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.

Abstract: A composite sorting apparatus for separating conductive materials from non-conductive materials comprising a drum electrode, needle-shaped electrodes, and a plate-shaped electrode, wherein the plurality of needle-shaped electrodes are arranged so that the interval X in cm (in) between discharge sections of adjacent needle-shaped electrodes with respect to the distance L1 in cm (in) from the tips of discharge sections to the drum electrode meets 0<X/L1≦3.

Abstract: A feed tray (22) for guiding tribo electrified plastic pieces (2) to a drum electrode (6) is provided with a vibrator (23), thereby making it possible to vibrate the plastic pieces (2) to form a thin uniform layer, and to reliably apply appropriate image force and centrifugal force to the plastic pieces (2) fed to the drum electrode (6); thus, the plastic pieces (2) can be separated according to kind with high precision.

Abstract: In a composite sorting apparatus comprising a drum electrode (4), needle-shaped electrodes (5), and a plate-shaped electrode (9) to separate a mixture (A) of a copper wire (A2) and plastic pieces (A1) into the copper wire (A2) and the plastic pieces (A1), the plurality of needle-shaped electrodes (5) are arranged so that the interval X(cm) between discharge sections (5a) of the adjacent needle-shaped electrodes (5) with respect to the distance L1(cm) from the tips of the discharge sections (5a) to the drum electrode (4) meets 0<X/L1≦3. Further, the discharge sections (5a) are each formed so that an area formed on the drum electrode (4) and to which corona ions are applied has a diameter three times as large as the distance L1(cm). Furthermore, a voltage (V1) applied between the needle-shaped electrodes (5) and the drum electrode (4) is set to meet 0.5 (kV/cm)≦V1/L1≦10 (kV/cm).

Abstract: A device for electrostatically separating different kinds of crushed plastic pieces and correctly sorting them according to kind. The device has a classifying section (40) for classifying plastic pieces according to size, a frictional charging device (17), a pair of drum type electrostatic separating devices (41), and collecting sections (26) disposed below the electrostatic separating devices. Partition walls (52-55) for partitioning the collecting sections are constructed to be horizontally movable according to the fall positions associated with the polarity and amount of electric charge of each plastic piece (16). Therefore, separation can be correctly effected without changing the voltage from a high voltage power source device (24).

Abstract: Supplying a predetermined amount of electric energy to a fine metal wire 4 in a short time causes the fine metal wire 4 to melt and evaporate. Following this phenomenon, a blasting substance 10 expands in volume, so that the evaporative expansion force resulting from the melting evaporation of the fine metal wire 4 is transmitted to and blasts a to-be-blasted object 5.

Abstract: The invention provides a plastic sorting method and apparatus, which, when plastic pieces comprising a plurality of types of resin plastics are agitated and frictionally charged, are able to impart the plastic pieces a necessary amount of charge or polarity for the thorough separation even if the difference in the amount of the different types of plastic pieces is large and to increase the recovery rate. If the amount of a specified type plastic pieces (1) to be recovered is small, the agitation and the electrostatic separation is carried out after adding the specified type plastic pieces (1) as auxiliary frictional charging material (21) into the frictional charging device (3), and the auxiliary frictional charging material (21) remains in the frictional charging device (3) and is used repeatedly.

Abstract: When plastic pieces of plural different types of resins fed into a hopper are agitated to be triboelectrically charged, the plastic pieces are not imparted with sufficient amounts of charges or proper polarities which are required for separation of the plastic pieces if there are great differences in quantity between the different types of plastic pieces. This makes it impossible to properly separate the plastic pieces. Where the amount of pieces of a particular plastic to be separated is small, pieces of the particular plastic are additionally fed as a triboelectrification agent into a triboelectric charger (3) and agitated with the plastic pieces. Thus, different types of plastic pieces (1) (e.g., PVC and PE) are prevented from being imparted with the same polarity and are imparted with different amounts of charges, so that the separation can assuredly be carried out in an electrostatic separating section (G) for recovery of the particular plastic pieces.

Abstract: A melting/vaporization substance 2 is melted and vaporized by supplying an electric energy of a predetermined amount from an electric energy supply circuit to the melting/vaporization substance 2. An explosive blasting substance 3 is exploded by a phenomenon caused in a process of melting and vaporization of the melting/vaporization substance 2, so that a to-be-blasted object 4 is blasted by that explosive force.

Abstract: A fusible and vaporizable substance (for example, a thin metal wire is used) 2 is fused and vaporized by supplying thereto a predetermined amount of electrical energy from a capacitor 14 of an electrical energy supply circuit 10 for a short period of time, and nitromethane 3 is detonated by a phenomenon in the process in which the fusible and vaporizable substance 2 fuses and vaporizes, so that an object to be blasted 4 is reliably blasted by this detonation force.

Abstract: A conveyor (3) feeds batches of plastic chips (2) in feeding amounts W1 to a charging device (4). After the plastic chips (2) have been stirred and charged inside the charging device (4) for a certain period of time T, they are ejected in batches and fed continuously by a screw feeder (20) to a drum electrode (5) at a feeding amount per unit time W2. The feeding amount per unit time W2 is adjusted so as to satisfy W1/T≦W2≦v×B×H×D where v is the rotation speed of the drum electrode (5), B is a width of the drum electrode (5), H is an average thickness of the plastic chips (2) that have been fed onto the drum electrode (5), and D is a bulk density of the plastic chips (2).

Abstract: An electric screen device for preventing creatures from intruding into a water channel, which comprises a pair of opposed electrode assemblies disposed on opposite sides of a water intake channel, and a dc pulse applying device 13 for applying dc pulses between the electrode assemblies. In such electric screen device, the product of the peak value of the intensity of an electric field produced between the electrode assemblies by the dc pulse applying device and the body length of creatures to be prevented from intrusion into the water channel is not less than 0.1 V, the dc pulse applying time is within the range of 2-200 msec, and the duty factor of the dc pulse is not more than 0.5.

Abstract: Supplying a predetermined amount of electric energy to a fine metal wire 4 in a short time causes the fine metal wire 4 to melt and evaporate. Following this phenomenon, a blasting substance 10 expands in volume, so that the evaporative expansion force resulting from the melting evaporation of the fine metal wire 4 is transmitted to and blasts a to-be-blasted object 5.

Abstract: An apparatus which is constituted to supply electrical energy to a melting and vaporizing material (for example metal wire 6) so as to cause the melting and vaporizing material to melt and vaporize, thereby demolishing an object to be demolished (such as concrete 2) using the vaporization and expansion force generated at the time of melting and vaporization of the material; wherein either by providing a granular material 8 which ejects from a container following the generation of the vaporization and expansion force, or by using an inflammable material as demolishing material 46 in which the melting and vaporizing material is immersed, a to-be-demolished object is demolished with a strong demolishing force.

Abstract: A thin metal wire 8 is fused and vaporized by a predetermined amount of electrical energy supplied to the thin metal wire 8 for a short period of time, whereby a blasting substance 3 is expanded in volume. Therefore, a vaporization expansion force caused by the fusion and vaporization of the thin metal wire 8 moves a shock delivering member 22, so that the shock delivering member 22, colliding with a to-be-blasted object H1, delivers a shock to the to-be-blasted object H1, thereby blasting the to-be-blasted object H1.

Abstract: A discharge breaking system and a discharge breaking method for breakage and decomposition of objects to be ruptured such as destruction of base rocks and breakage of stones into small pieces at building lands, breakage for finishing tunnels and destruction of concrete buildings. A discharge breaking system is configured to supply or discharge electric energy charged or accumulated in a capacitor between a pair of electrodes in a short time for abrupt vaporization of a breaking substance for transmitting a pressure, thereby breaking an object to be ruptured with an expansion force generated by the vaporization. The discharge breaking systems has a structure wherein an end portion of a sheath member which covers a pair of metal cores for composing a cable is cut off to expose ends of the metal cores, and the exposed ends of the metal cores are submerged in the breaking substance and used as electrodes.

Abstract: Supplying a predetermined amount of electric energy to a fine metal wire 4 in a short time causes the fine metal wire 4 to melt and evaporate. Following this phenomenon, a blasting substance 10 expands in volume, so that the evaporative expansion force resulting from the melting evaporation of the fine metal wire 4 is transmitted to and blasts a to-be-blasted object 5.

Abstract: A frictional charging device (30) for charging crushed chips (1) of a plurality of kinds of plastics by stirring them. A stirring vessel (31) has a friction assisting material (52) put therein, the particles of the friction assisting material (52) being so formed that they are larger than the plastic chips (1). A delivery port (34) formed in one end of the stirring vessel (31) is provided with a plurality of delivery area wires (47) arranged at predetermined intervals and parallel to each other. The spacing between adjacent delivery area wires (47) is set larger than the plastic chips (1) and smaller than the particles of the friction assisting material (52).