Coating processes – Direct application of electrical – magnetic – wave – or... – Pretreatment of substrate or post-treatment of coated substrate
Patent
1996-08-28
1998-11-17
Pianalto, Bernard
Coating processes
Direct application of electrical, magnetic, wave, or...
Pretreatment of substrate or post-treatment of coated substrate
118 35, 118 56, 118 70, 118500, 427140, 427271, 4273722, 427444, 427554, 427596, B05D 300, C08J 718
Patent
active
058373292
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE TECHNOLOGY
The present invention relates to a method for removal of organic thin film from a roller, and equipment for implementing this method. Specifically, the present invention relates to a method and equipment which use laser light to effectively remove organic film from the photosensitive drums used in photocopy machines, printers and facsimile equipment, fixing rollers, rubber rollers, magnetic rollers, and various other types of rollers. It further relates to a method and the necessary equipment to use laser light to process defective products generated in the process of roller manufacture, as well as various types of used rollers, enabling reuse of said rollers.
BACKGROUND OF THE INVENTION
Rollers are used in a variety of machines and devices. For instance, photosensitive drums, fixing rollers, rubber rollers, and magnetic rollers are used in photocopy machines, printers, facsimile machines, and other equipment. In general, such rollers are either cylinders with a high degree of concentricity formed of aluminum or some other metal, or else a similar metal cylinder, the surface of which has been treated in various methods and covered with a film. Fixing rollers often consist of aluminum cylinders with a fluoride resin coating; similarly, rubber rollers are often aluminum cylinders with a rubber coating. Photosensitive drums generally consist of a cylinder of aluminum or some other metal, to which an undercoating is applied, followed by coating with a layer containing titanium oxide or some similar material, a polycarbonate resin layer, and a film. Magnetic rollers are used to supply toner; often a metal cylinder is used without further modification.
The following problems with these rollers have been identified, relating to roller manufacturing and use:
(1) When forming the film on the metal cylinder surface, the metal cylinder is immersed in a container of liquid from which a film is to be formed, and said metal cylinder is then pulled upward. At this time, the bottom part of the immersed cylinder is completely covered, but the upper part remains uncovered. For this reason, the roller is unbalanced. It therefore becomes necessary to remove part of the film on the bottom, in order to finish the roller so that it is balanced.
(2) When magnetic rollers used for toner supply are used for long periods of time, styrene resins and other toner components tend to adhere to the roller surface and accumulate, so that an undesirable film is formed. Such an undesirable film on the magnetic roller adversely affects the magnetic and electrical properties of the toner, and degrades the quality of the resulting image.
(3) When rollers are used for extended periods of time, the film on the roller surface may receive damage in a non-uniform manner, or foreign matter may adhere to its surface. As a result, multiple sheets of paper for recording may be fed into the mechanism, the quality of photocopies may be deteriorated, or other problems may occur. Rollers which give rise to such problems during equipment use must be replaced, and in general, rollers which have been replaced cannot be refurbished and, therefore, are discarded. Because number of rollers which are thus discarded is very large, a means for recovery and refurbishing of the rollers is desired.
(4) In the process of manufacturing various rollers, such as photosensitive drums, fixing rollers, and rubber rollers which are used in photocopiers, printers and facsimile machines, defective products occur as a consequence of film formation processes. The rate of occurrence of such defective items is said to be at least 10%, and because it is not easy to recover and reuse such defective rollers, they are discarded. In conjunction with rollers discarded after replacement as described in (3) above, this represents a considerable waste of resources, and an appropriate means of roller reuse is sought.
(5) When forming a film on the surface of a roller during roller manufacturing, the film thickness may be non-uniform, or the film surface may be irre
Pianalto Bernard
Shinozaki Manufacturing Co., Ltd.
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