Application Research of the hottest dry silver las

Research on the application of dry silver laser film hot drum imaging

Objective:

through the application of dry silver laser film hot drum imaging, observation, research and simulation experiments, provide a reliable basis for the image stability of dry silver laser imaging film and the normal maintenance of hot drum

materials and methods

1 Main equipment

1.1 the support of dry silver laser film is 0.175 mm polyester film, and the photosensitive layer is a packaging machine 'target' which combines extremely fine silver salt crystal particles with couplers, catalysts, etc. and polymer polymers=_ Blank> the transparent film is about 4 microns thick, and there is a thin protective layer on the surface of the photosensitive layer. The characteristic peak of photosensitive spectrum is 810 nm. There is no anti halo layer on the back of the support. The integrated film is installed in a special cassette operated by a manipulator and monitored by a computer, and then used together by pressing the "drop weight" key

1.2 take 8700 type as an example. The shape diameter of the hot drum is 160 mm, the length of the working surface of the drum is 410 mm, and the weight is 7.5 kg. The surface of the working surface of the hot drum is covered with a layer of soft, delicate, 1.5 mm thick thermal conductive synthetic rubber. The hot drum working layer is the driving wheel. About less than 180 above the hot drum "There are 20 small metal rollers with mirror finish and excellent rigidity wrapped around the semicircle, which is called the driven wheel. Its elastic pressure is designed to ensure the sliding fit between the film and the surface of the hot drum, and the transmission of the film is just right, so as to ensure the image quality. The outer circumference of the driven roller assembly is a thermal insulation layer. The whole driven wheel assembly is designed to facilitate rapid separation for maintenance needs. The drum core is a fixed body, and its structure is a concentric circular grid The internal organs are equipped with temperature sensors, and the power supply and control signal lines are input from one end. The inner diameter of the working face of the hot drum and the concentric electric drum core maintain a good sliding match without gap feeling. After startup, the hot drum works and rotates evenly all the time, without temperature gradient difference, so as to ensure the imaging quality

2 experimental observation of split simulated thermal imaging

2.1 first prepare the master film, use 810 nm dry view film as the copy film, and expose three image films on the contact copying machine with an infrared source for standby

2.2 feed a copy to the dry view8700 or 8100 laser imager host, start the host image correction function printing program, and the host hot drum completes the imaging of the copy. The imaging results are satisfactory and similar to those of the master film

2.3 use the heat source of the steam pressure cooker to develop the hot drum on another copy film, and operate it manually. Under the condition of avoiding light, the imaging temperature is approximately 120 ℃, and no satisfactory image is obtained

2.4 the third copy film is simulated into a constant temperature hot oil automatic film development with a clear mineral oil bath heated to 124 ℃. Satisfactory imaging results are similar to the first

through the comparative observation and analysis of the three experimental results, we have mastered the maintenance points of dry view hot drum imaging

3 observation of light experiment of dry silver laser film

3.1 place dry silver dry view film under direct sunlight (temperature 32 ℃), and observe that the original transparent film gradually changes to light red tea color after 4 hours. The control group placed in kraft paper had no staining

3.2 the film is placed under indoor artificial lighting (fluorescent lamp), and light gray photochemical staining can be seen after 72 hours of illumination

3.3 if the film is pasted on the surface of the incandescent lamp (the power is more than 4 (), and the room temperature is 24 ℃), the film will change color for O seconds at the contact point

4 destructive test of dry silver laser film image

put the image film in a 2000ml beaker, pour the experimental data, and arbitrarily delete and add 95 degrees of hot water. Within two minutes, it is observed that the image immediately begins to damage. When the water temperature drops to 80 degrees, replace it with 95 degrees of hot water, and the film turns black. However, the drug film layer is intact, and the drug film layer of the photosensitive imaging layer does not absorb water, does not swell, does not peel off, and is intact

5 experimental observation of dry silver laser film in PQ developing solution at 20 ℃

5.1 the film imaging layer surface shall be firmly and reliably observed without scratched film immersed in its developing solution, and without chemical oxidation-reduction anti protective device, that is, the drug film layer shall not be blackened. However, after careful observation of the cutting surface around the film, we can see that there is a tendency of blackening

5.2 blackening occurs when the film surface facial mask is removed and then immersed in the developer. The maximum density (4.0) can be reached after soaking for 10 minutes

5.3 make the imaging layer into powder and pour it into the bottle containing the developer, and the white particles will darken immediately

6 dry silver laser film photosensitive layer coating test observation

dry silver laser film photosensitive layer, using methyl methacrylate, coated on the photosensitive layer, observed that the drug film layer immediately began to swell and wrinkle. It is loose, damaged and easy to fall off, and the developer drops on it to blacken immediately

7 the silver laser film was placed under the irradiation field of the medical electron linear accelerator with a dose of 2000gy, which failed to obtain the stabilizing effect of the dry silver laser film image, but also did not cause image damage

7.4 the dry silver laser thermal imaging film archived by the ball friction and wear tester 8 was compared with the ordinary laser imaging film, and there was no significant difference in image quality. There is only a slight difference in the hue of the image, and there is also a hue difference between high and low density

results

Kodak DIY view dry laser thermal imaging printer has automatic image quality control technology, which ensures the high definition and consistency of each photo, but it is known from the above observation and research. It cannot solve the image quality problems caused by the damage of the hot drum surface and the instability caused by the film characteristics

dry silver laser thermal imaging film is a special kind of silver salt, infrared film. The properties of its photosensitive layer often accumulate with time, light and infrared acceptance, and the fog increases during imaging, because it only has imaging and no fixed image. Therefore, in a sense, it is an unstable image. The current method is mainly based on the performance characteristics of the film. In the custody of the image film, pay attention to avoid heat sources, reduce light and infrared rays, and do not contact organic solvents. Usually put it in a kraft paper pocket. Once the image is damaged, the hospital has the original image data saved and can be copied. Moreover, the imaging hot drum is a very important component of imaging quality, and it is also one of the most easily damaged and expensive components in the whole machine. Due to the hardware damage, the main factors affecting the image quality come from the hot drum components, including: the consistency of the surface temperature of the hot drum, the surface flatness and softness,

the pressure uniformity of the pressure roller, especially the aerosol crystals caused by high-temperature imaging will accumulate near the surface of the drum, resulting in line and dot shaped image artifacts

in view of this, hot oil tank imaging is an idea. At present, what we should do is to check whether the hot drum is normal before starting up every day. Can be put into operation

conclusion

dry silver laser film hot drum imaging is one of the best imaging quality among all kinds of dry film imaging devices at present. There are five reasons: ① using silver salt sensors and silver crystals below the micron level, the imaging is clear and rich in layers; ② The silver salt crystal adsorbed with a certain photosensitizer can be adapted to the corresponding laser spectral imaging source, which is expected to have smaller laser spots and clearer image quality; ③ A certain catalytic reagent is added into the photosensitive layer to realize thermal imaging, which eliminates various secondary processing processes necessary for the wet imaging of traditional gelatin layer sensors. ④ Silver laser film thermal drum imaging is not only useful in medicine, but also has important application value in engineering and military. ⑤ Dry silver laser film thermal drum imager equipment, when the geometric size of the thermal drum is changed, can be designed to synthesize various types of high-performance dry laser imagers with different imaging time (speed)

dry film imaging is still developing, and the image stability of dry silver laser film hot drum imaging is a temporary problem. It needs further verification