摘要:
A process for improving adhesion of a thermoplastic polymeric resin on a casting surface by using an electrostatic pinning wire in conjunction with a conductive shield. The method includes the steps of extrusion casting a sheet of molten polymer from a die, directing the cast sheet onto a moving, chilled and electrically grounded casting surface to solidify the polymer and extending a conductive wire transverse to a longitudinal axis of the sheet with the sheet between the wire and the chilled surface before the sheet contacts the chilled surface. An elongated conductive uninsulated shield parallel to the wire with the wire between the shield and the sheet is provided and a bias voltage is applied to the wire and the shield. The bias voltage of the wire is in the range of 6 to 15 kV, and the bias voltage of the shield is adjusted to be at least 5 kV lower than the voltage of the wire to maintain a desired current flowing from the wire and the shield to the sheet.
摘要:
A system for charging a photoreceptor (3) includes a first corona charging unit (2) a first corona electrode (4), a first shell electrode (6), and a first high voltage power supply (22). The shell electrode is connected through a resistor to ground and the high voltage power supply is connected to the first corona electrode. A second corona charging unit (10) has a second corona electrode (12), and a first grid electrode (14) connected to a second shell electrode (16). A first corona current from the first high voltage power supply to the first corona electrode and a return current from the first shell electrode to ground is sensed and a voltage on the high voltage power supply is adjusted to maintain a constant difference. The first corona charging unit charges the photoreceptor to at least 63% of the desired voltage.
摘要:
A method for charging an insulating object on a static dissipative surface with a constant current includes placing a corona electrode in close proximity to the insulating object; placing a shell electrode in close proximity to the corona electrode; connecting a high voltage power supply to the corona electrode; placing a counter electrode on a side of the static dissipative surface opposite the corona electrode; maintaining the counter electrode at a constant potential; raising the potential of the shell electrode to at least one tenth the magnitude of the potential of the corona electrode; sensing a first current from the high voltage power supply to the corona electrode; sensing a second current from the shell electrode to ground; and adjusting a voltage on the high voltage power supply to maintain a constant difference between the first current and the second current.
摘要:
The present invention is an intermediate transfer member for use in an electrostatographic machine. The intermediate transfer member includes an insulating support layer having an inner side and outer side, with a conductive layer disposed on at least the outer side. There is at least one conductive connection between the inner side of the insulating support layer and the conductive outer layer.
摘要:
A method is taught for curtain coating a liquid composition onto a moving web at a coating point where the moving web is supported on a backing roller. The web is partially wrapped around the backing roller, the backing roller including a relief patterned area on the surface thereof, the relief patterned area including relieved features and non-relieved features, the relieved features and the non-relieved features creating an electrostatic force difference exerted on the liquid composition at the coating point when an electrostatic field is applied thereto. A web speed is specified and the electrostatic force difference exerted on the liquid composition at the coating point is varied to determine a maximum electrostatic force difference for the specified web speed that achieves the predetermined acceptable level of coating thickness non-uniformity. The web is moved at the specified web speed and an operating electrostatic force difference is generated at the coating point that is not greater than the maximum electrostatic force difference for the specified web speed.
摘要:
A receiving sheet having a loose toner image on a surface of the sheet is transported from an image member to a fuser by continuing movement of the image member. To prevent disruption of the loose toner image and to accommodate any difference in speeds of the image member and the fuser, air is directed on the image side of the receiving sheet to force the receiving sheet against a curved guide positioned behind the receiving sheet.
摘要:
One or more toner images are transferred to an intermediate image member and then to a receiving sheet. The intermediate image member is made relatively conductive, for example, it has a resistivity less than 10.sup.9 ohm-cm facilitating transfer to the intermediate. To provide adequate allowance for variability for the impedance of receiving sheets a transfer backing roller forms a nip with the intermediate image member which transfer backing roller has a relatively low conductivity. For example, the transfer backing roller has a resistance of 10.sup.10 ohm-cm or greater.
摘要:
The use of electrographic printing to prepare prints which have a desired tactile feel or raised information in a controlled manner by utilizing a developer having toner particle size larger than 50 microns volume average diameter and carrier particles larger than the toner particle size such that the volume average distribution overlap between the toner distribution curve and carrier particle distribution curve is less than 35% and the carrier and toner particles have a volume average diameter size differential equal to or greater than 5 microns or the ratio of carrier-to-toner volume average diameter exceeds 1.25.
摘要:
A method and system for printing adjustable gloss image documents using a variety of toners where some toners have a relatively low melt viscosity and others have a relatively high melt viscosity. These toners are co-printed prior to fixing, on the receiver proximate to and overlying at least a portion of each other.
摘要:
Electrophotographic printing of one or more layers of toner using a method of enhancing fuser offset latitude to enable the printing of a wide range of toner mass laydown using electrophotography. This method encompasses the steps of forming multicolor toner images, determining the amount of clear overcoat mass laydown as a function of the color mass laydown or non-raised mass laydown and fusing the clear toner overcoat and the multicolor toner image at a fusing temperature determined by the maximum total mass laydown and the nip width to provide good adhesion to the receiver member while optimizing fuser offset latitude.