Abstract:
A composition suitable for use in the preparation of liquid toners of the negative type for electrostatic imaging, which comprises: an insulating non-polar carrier liquid; and toner particles micro-dispersed in said carrier liquid, which particles have been surface treated such that the toner material at the surface of the particles comprises halogenocarbon chains.
Abstract:
Toning apparatus (23) for toning an electrostatic latent image, having image and background portions at different potentials on an imaging surface (16). The apparatus comprises an endless toning surface (21) coated with a layer of concentrated liquid toner and engaging the imaging surface (16) at a toning region. The apparatus additionally comprises a source of voltage connected to the toning surface (21) and electrifying the toning surface (21) to a voltage operative to selectively transfer at least a portion of the layer to image portions on the imaging surface (16). A developed mass per unit area (DMA) controller having an input indicative of the DMA on the imaging surface (16) is operative to adjust the DMA on the toning surface (21) in response to the input.
Abstract:
A method for reducing ghost images caused by previous charging cycles of a photoreceptor including the steps of charging the photoreceptor to a first potential, selectively discharging portions of the photoreceptor to form a latent image thereon, recharging at least some of the selectively discharged portions to a second potential and developing the recharged latent image.
Abstract:
Apparatus for printing images on generally cylindrical objects (72), such as cans, comprising: an image bearing surface (12) having an image thereon; and an impression guide (71) which is generally parallel to and spaced from the image bearing surface, which guide supports said cylindrical objects in rolling contact with said image bearing surface, whereby images are transferred from said image bearing surface to surfaces of said cylindrical objects (72) in contact therewith.
Abstract:
A printing process for forming images or designs on a floor tile, comprising: (a) providing a protectively coated toner image or design on a floor tile base material; and (b) laminating the coating and image to the base material.
Abstract:
A printing process for forming high contrast color images on polymer surfaces, comprising: (a) forming a layer of substantially opaque liquid toner comprising polymer based toner particles and a carrier liquid, on an imaging surface; (b) transferring the layer to an intermediate transfer member; (c) heating the layer on the intermediate transfer member to a temperature at which the toner particles at least partially coalesce; (d) repeating (a) to (c) sequentially for at least one subsequent layer in at least one color, said at least one subsequent layer being transferred to the intermediate transfer member onto the opaque layer to form multiple layers on the intermediate transfer member; and (e) transferring the multiple layers to a polymer surface.
Abstract:
A method of temperature controlled electrostatic imaging for an imaging apparatus having a photoreceptor surface and a supply of liquid toner comprising charged toner particles and carrier liquid, the method including: charging the photoreceptor surface; selectively discharging portions of the charged photoreceptor surface to form an electrostatic latent image thereon; controlling the temperature of the liquid toner; developing the electrostatic latent image with the temperature controlled liquid toner to form a developed image; and transferring the developed image to a substrate to form a printed image thereon.
Abstract:
An image processing method comprising: providing a digital, continuous-tone, input image represented by an array of pixels, the array having a predetermined pixel resolution and each pixel having a gray level; dividing the array of pixels into a plurality of sub-arrays of pixels; determining a gray level contrast for each of the sub-arrays; if the gray level contrast of a given sub-array exceeds a preselected threshold, generating a high resolution, narrow gray level range, sub-array corresponding to the given sub-array; and if the gray level contrast of the given sub-array is below the preselected threshold, generating a low resolution, wide gray level range, sub-array corresponding to the given sub-array.
Abstract:
A method of adjusting imaging apparatus including: (a) charging a photoreceptor surface to a first voltage; (b) selectively discharging portions of the charged photoreceptor surface, with a beam of electromagnetic energy such as a laser beam or LED output, having a controllable power, to form a predefined electrostatic latent test image on the photoreceptor surface; (c) developing, using a second voltage different from the first voltage, a layer of charged toner particles onto the selectively discharged portions of the photoreceptor surface, thereby providing a developed test image corresponding to the latent test image; (d) measuring the apparent optical density of portions of the developed test image, including a solid print portion and a predetermined gray level portion; (e) comparing the measured solid and gray level optical densities with predetermined, desired, solid and gray level optical densities; and (f) adjusting the second voltage and the power of the laser beam based on the comparison between the measured and desired solid and gray level optical densities.
Abstract:
Imaging apparatus incorporating a substantially rectangular organic photoreceptor sheet having a backing layer, a conductive layer and a photoconductive layer, wherein along one edge of the sheet there is an exposed conductive area, a drum having a longitudinal cavity formed therein and including a slot formed between the cavity and the cylindrical surface of the drum into which the one edge of the photoreceptor sheet is inserted and a rotatable element within the cavity which, in a locking position, presses the sheet against a wall of the cavity, fixedly and removably holding the photoreceptor sheet in place.