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Variflo edge coating for precise feature control

IP.com Disclosure Number: IPCOM000226899D
Publication Date: 2013-Apr-23
Document File: 5 page(s) / 381K

Publishing Venue

The IP.com Prior Art Database

Abstract

This idea proposes to tie the dispense flow rate in a dispersion coating operation to the rate at which the dispenser travels over the surface being coated. The specific mechanism proposed is the use of an inverse time function block in an industrial controller to control the voltage to a fluid delivery pump. The specific example given is roller coating. Xerographic subsystems utilizing a belt roll fuser (BRF) are candidates for application of this idea. The idea can be used in the manufacture of the BRF. There are other possible uses in other industries and application areas such as flexible circuit fabrication.

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Variflo edge coating for precise feature control

This idea proposes to tie the dispense flow rate in a dispersion coating operation to the rate at which the dispenser travels over the surface being coated. The specific mechanism proposed is the use of an inverse time function block in an industrial controller to control the voltage to a fluid delivery pump. The specific example given is roller coating. Xerographic subsystems utilizing a belt roll fuser (BRF) are candidates for application of this idea. The idea can be used in the manufacture of the BRF.  There are other possible uses in other industries and application areas such as flexible circuit fabrication.

A key issue in various solution or dispersion coating operations is achieving a fine edge detail or border in a finished product. In some products or articles, such as belts composed of flexible substrates, the edge of the finished product can be trimmed. In cases where this is not possible, or where precise coating composition control is desired, a suitable method of controlling solution delivery rate of flow would be of considerable value. Without this, the finished coating either will have a ragged edge or thickness issues in the outer edge of the coating.  This idea uses an inverse time related function block in an industrial controller. The function block controls an output voltage that is used to regulate the speed of a fluid delivery pump to control the flow rate of the material at the beginning of the coating. The function block ties flow rate to the rpm of the roller as well as the traverse rate of the applicator. Using this method allows for obtaining a much cleaner edge and achieving the thickness specification within the first 5mm of the coating edge start.

Current methods of fuser belt fabrication involve flow coating of a solvated polymer dispersion which includes a polymer, cross linker, filler(s), and optionally other flow agents, surfactants or co-solvents. The liquid coating is deposited on a rotating cylinder or offset cylinder and then kept at a controlled environmental condition, either ambient or within a rotation oven, until most of the solvents are evaporated. The component is then introduced to a higher temperature oven until the coating is cross linked and any residual solvents or materials are removed. Alternatively, a secondary or tertiary liquid layer is coated upon the substrate to form a multi-layered article.

For fusing components, uniform compression is required for optimal fusing. Current methods of coating result in the area toward the...