Radiation imagery chemistry: process – composition – or product th – Color imaging process – Using identified radiation sensitive composition in the...
Reexamination Certificate
2003-04-29
2004-11-30
Le, Hoa Van (Department: 1752)
Radiation imagery chemistry: process, composition, or product th
Color imaging process
Using identified radiation sensitive composition in the...
C430S403000, C430S523000, C430S527000
Reexamination Certificate
active
06824964
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to an image forming method utilizing a silver halide color photosensitive material, and more specifically to an image forming method capable, in a low replenishment processing of a silver halide color photosensitive material, of suppressing a deterioration of a stain (sheet edge stain) on an end cut face (edge face) after the processing and improving stacking property of processed sheets, and an image forming method with reduced failure in the transporting of the silver halide color photosensitive material.
2. Description of the Related Art
In recent photoprocessing service industry, a color print system for obtaining a color print from a color negative film, a color reversal photosensitive material, a digital camera etc. has become popular not only in processing laboratories specialized in development and printing but also in ordinary photo shops. Exposure method in such color print system is principally divided into so-called analog exposure system in which an exposure is made by a light transmitted through a translucent photosensitive material such as a color negative film or a color reversal photosensitive material, and so-called digital exposure system in which digital information of an image stored in a memory device such as a semiconductor memory or information obtained by digitizing the image of the aforementioned translucent photosensitive material is printed as image information to form a color print for example with a semiconductor laser.
In such color print system, the photosensitive material is wound in a roll, then set in a magazine, mounted in the system and pulled out of the magazine for transporting. The photosensitive material, or so-called color photographic paper, has usually been transported by so-called roll transport in which the material is subjected to an exposure and a developing process in an uncut state and is finally cut into an individual print. However in order to clarify the boundary of each print, a shot information has to be formed and such portion is inevitably wasted. Therefore, there is commercialized a color print system employing a transporting method in which the photosensitive material is cut into a sheet of individual print, and then subjected to an exposure and a development process. Such transporting method employs a transporting system with paired transporting rollers and a transporting system with a conveyor belt to avoid an unevenness in a scanning exposure, after which the photosensitive material is supplied to developers. Such color print system, being utilized in processing laboratories and photo shops, is operated under various environments which are in fact different among these laboratories and photo shops and vary depending on the time in a day or the season. Particularly in winter, the color print system is often used in a dry environment, which often leads to troubles resulting from electrostatic charging of the color prints, such as a static mark, a transporting failure or a stacking failure. In particular, a stacking failure is encountered in a step of stacking and grouping the prints, obtained after the processing, into a unit of each color negative film or each digital information of a customer, and requires a manual resorting operation. Also in comparison with the aforementioned roll transport system, the sheet transport system used in the color print system tends to cause a transporting failure by electrostatic charging at the transfer of the photosensitive material from the paired transporting rollers to the conveyor belt.
On the other hand, certain color print systems employ a low replenishment processing of the photosensitive material, in order to alleviate the environmental burden and to reduce costs for recovery and treatment of the used solutions. In such low replenishment processing, components discharged from the silver halide photosensitive material to the developers are accumulated therein in larger amounts, and, for example an increased halogen accumulation leads to drawbacks such as a slower proceeding of image development, an aggravation of so-called edge stain, which is a brown stain caused by intrusion of the developers into an end cut face (edge face) of a laminated paper of polyethylene resin layers of a substrate (usually called color print material), and a deterioration of the solution stability. The edge stain becomes aggravated with time in a case that the photographic print is stored in a high temperature and/or high humidity condition. It is therefore desired, by the market of the color print laboratories, to provide a processing method capable of avoiding the edge stain, in the low replenishment processing for the aforementioned purposes.
The present invention is to solve the aforementioned drawbacks in the related technology, and to attain the followings. An object of the present invention is to provide an image forming method capable of suppressing a transporting failure in a silver halide color photosensitive material, and an image forming method capable, in a low replenishment processing of the silver halide color photosensitive material, of suppressing aggravation of a stain (edge stain) of an end cut face (edge face) after the processing and improving stacking property.
SUMMARY OF THE INVENTION
As a result of intensive investigations on failures encountered in an image forming method executed utilizing transportation with a paired transport rollers and/or a belt conveyor, the present inventors have found it possible, by introducing colloidal silica in a rear surface side (back layer) of the photosensitive material and by maintaining a surface resistance of 1.0×10
14
&OHgr; or less and/or a charge leak time of 200 seconds or less on the rear surface (surface of back layer) of the photosensitive material, to reduce a surface contact area with the paired transporting rollers and/or the belt conveyor, and to quickly eliminate the charge caused by peeling, thereby suppressing the transporting failure caused by charging. Also the paired transporting rollers are usually formed by hard rubber rollers or metal rollers having a high dimensional stability and the photosensitive material tends to be charged when it is brought into contact with such rollers and is peeled off therefrom, but it is found that inclusion of a specific fluorine type surfactant in the rear surface side of the photosensitive material reduces such charging tendency and the transporting failure, whereby the present invention has been made. Furthermore, as a result of intensive investigations, the present inventors have found that, in a development process with low replenishment amounts of a color developer and a desilvering bleach-fixing solution, use of a specific fluorine type surfactant in the silver halide color photosensitive material surprisingly suppresses aggravation of the edge stain of the photosensitive material and improves the stacking property of the photosensitive material after the processing, thereby reaching the present invention.
In the first aspect, the invention provides an image forming method (J) comprising the steps of:
cutting a silver halide color photosensitive material, which has, on a reflective substrate, photographic layers comprising at least one of each of a blue light-sensitive silver halide emulsion layer containing a yellow dye forming coupler, a green light-sensitive silver halide emulsion layer containing a magenta dye forming coupler, a red light-sensitive silver halide emulsion layer containing a cyan dye forming coupler, and a non-photosensitive hydrophilic colloid layer, into sheet form;
subjecting the sheet to imagewise exposure under transportation with at least one of paired transporting rollers and a belt conveyor; and applying development processing that includes color development, bleach-fixing, and rinsing, to the sheet
wherein said silver halide color photosensitive material comprises a back layer on a side of the reflective substrate opposite to the silver halide emulsion layers, said b
Ishizaka Tatsuya
Kato Atsushi
Yanagi Terukazu
LandOfFree
Image forming method does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Image forming method, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Image forming method will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3293480