Paper making and fiber liberation – Processes and products – Non-uniform – irregular or configured web or sheet
Reexamination Certificate
1997-04-08
2001-04-17
Chin, Peter (Department: 1731)
Paper making and fiber liberation
Processes and products
Non-uniform, irregular or configured web or sheet
C162S125000, C162S201000, C428S211100, C428S409000, C428S537500
Reexamination Certificate
active
06217708
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a double-side and full color transfer paper for electrophotography having an improved traveling characteristic in an electrophotographic copying machine or a printer when a double-side copying operation is performed.
2. Description of the Related Art
Copying machines, printers and facsimile machines using the electrophotography are structured such that a charge pattern is formed on the surface of a photosensitive drum or a photosensitive belt containing amorphous silicon, an organic semiconductor and so forth to form a toner image by causing toner particles to adhere to the charge pattern. Then, transfer paper is brought into contact with the photosensitive surface to perform corona discharge or the like from the wire side of the paper so as to transfer the toner image to the transfer paper and fix the same with heat, pressure or the like to obtain a printed image.
Since the foregoing full color copying method uses toner in four colors, its transference mechanism is considerably different from that of the conventional white and black copying machine. It is important for the full color copying machine to accurately superimpose and transfer four color toner images. Therefore, -a transfer drum method has been employed which is arranged such that a transfer member, such as transfer paper, is supported on a transfer-member holding member, typified by a transfer drum, which is rotated in synchronization with a toner-image carrier, such as a photosensitive drum, and a toner image is transferred to the transfer paper supported around the transfer drum.
To improve productivity of the copying operation, a tandem method of forming a color image is employed by a portion of apparatuses, the method being structured such that a transference-member holding member in the form of an endless belt is employed and a plurality of image forming means corresponding to the colors are disposed along a direction in which the transference-member holding member is moved so as to sequentially transfer toner images in the respective colors on the transfer member held by the transfer-member holding member.
As described above, the transference mechanism and the like of the color copying machine are considerably different from those of the white and black copying machine. Therefore, considerably different characteristics are required for the transfer paper. Since there arise a variety of requirements in that the quality of the formed image must be improved and the state of curled paper must be stabilized, various improving means have been suggested (for example, refer to Japanese Patent Laid-Open No. 1-292354, Japanese Patent Laid-Open No. 4-268567, Japanese Patent Laid-Open No. 4-291351, Japanese Patent Laid-Open No. 4-337736, Japanese Patent Laid-Open No. 4-349468, Japanese Patent Laid-Open No. 5-341553, Japanese Patent Laid- Open No. 5-53363 and so forth).
In recent years, many color copying machines have a double-side mechanism. Thus, means for improving requirements for the double-side copy to satisfy, for example, prevention of set-off and improvement in the quality of the formed image have been suggested (refer to, for example, Japanese Patent Laid- Open No. 6-186769).
If the transfer paper suggested so as to form a color image or transfer paper which has been used in a white and black electrophotographic method is used in the double side copying operation of a copying machine using the full color electrophotographic method, a fact has been detected that a critical problem arises in the traveling characteristic, and more particularly in the traveling characteristic in a low temperature and low humidity state.
SUMMARY OF THE INVENTION
Accordingly, an object of the present invention is to provide a double-side and full color transfer paper for electrophotography having excellent traveling characteristic when a double-side copying operation is performed by a full color copying machine or a printer, and more particularly having excellent traveling characteristic in a low temperature and low humidity state.
According to the present-invention, there is provided a (1) A double-sideA and full color transfer paper for electrophotography comprising a paper layer divided into a felt side and a wire side, wherein the difference between the orientation of fiber in the felt side and that in the wire side of the paper layer is 0.1 to −0.1, and both of residual curvature of the transfer paper in a MD (in a movement direction of a paper machine) and that in a CD (in a direction perpendicular to the MD) are included in a range from 7 to −7 m
−1
, and (2) a double-side and full color transfer paper for electrophotography according to (1), wherein the expansion ratio of the transfer paper in the CD is 0.55 or lower.
The above and other objects and features of the present invention will be more apparent from the following description taken in conjunction with the accompanying drawings.
REFERENCES:
patent: 5637383 (1997-06-01), Sakurai et al.
patent: 1-292354 (1989-11-01), None
patent: 4-268567 (1992-09-01), None
patent: 4-291351 (1992-10-01), None
patent: 4-337736 (1992-11-01), None
patent: 4-349468 (1992-12-01), None
patent: 5-53363 (1993-03-01), None
patent: 5-341553 (1993-12-01), None
patent: 6-186769 (1994-07-01), None
James P. Casey, Pulp and Paper Chemistry and Chemical Technology, 3rd ed. (John Wiley & Sons, Inc.), 1039, 1734, 1980.
Harada Katsumi
Kato Masaru
Kurihara Tsutomu
Watanabe Harumi
Chin Peter
Fuji 'Xerox Co., Ltd.
Oliff & Berridg,e PLC
LandOfFree
Double-side and full color transfer paper for... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Double-side and full color transfer paper for..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Double-side and full color transfer paper for... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2530471