335. What is the structural characteristics of the PS version of the development machine?
A: PS version of the development of the machine from the perspective of the structure is the front and back of the two parts, the front and back end connected by the plate device. The front end completes the development and water washing work, and the back end finishes the wiping and drying work. According to the function of each part, it can be divided into platen, developing device, washing device, over-plating frame, glueing device, drying device, receiving platen, and transmission control device; according to working principle, it can be divided into racks. , transmission systems, liquid circulation and replenishment devices, developing devices, water washing devices, gluing devices, drying devices, electrical controls and operating systems.
336. What is the role of the PS version of the baking machine?
A: The PS version of the roasting machine is a special roasting device for the high-temperature roasting treatment of the positive-printed PS plate to improve the printing plate's resistance to printing.
337. What process defects may occur during plate making and printing?
A: In the process of plate making, there may be process defects such as lack of printing plate, poor development, uneven development, excessive development, dirty plate, peeling and separation of the photosensitive layer; in the printing process, the most common process failure , paste version, dirty version, off version, poor ink, poor print resistance and so on.
338. What are the causes and solutions to the failure of printing plates?
A: The cause of the malfunction: The printer has stains on the glass, foreign objects or dirt are attached to the original plate; the positive picture film on the original plate is improperly tiled; the vacuum seal of the positive picture and the PS plate is not enough; the pad of the printing plate is not Appropriate; before or after exposure to the PS version of the light before the development; excessive development (excessive development temperature, development time is too long, the developer is too thick, too much liquid, etc.).
Solution: Clean the glass or original with a cleaning agent; make a collage of the film 3mm away from the image; confirm that the PS plate and the film are in close contact and after exposure; adjust the pad of the plate to make it flat; work under a safe light ; Develop according to standard development conditions; do not replenish excess replenisher.
339. Printing plate uneven development causes and solutions?
Answer: The cause of the malfunction is that the activity of the developer is reduced (such as thin developer, too short developing time, too low temperature of the developer, no replenishment of the developing solution and the backflow of the rinsing fluid, etc.), and the presence of dirty spots or foreign matter hinders the development.
Solution: Develop according to the standard development conditions; replenish the developer in time with the specified amount; check the printing equipment; clean the equipment.
340. What is the cause and solution to the problem of peeling and peeling off the photosensitive layer of the printing plate?
A: The cause of the malfunction: improper use of the PS plate, causing artificial scratches and scratches; causing scratches and scratches under pressure; storing the PS plate in a vibrating room; high concentration of developer.
Solution: Do not rub the PS plate; store the PS plate holder in a stable place; the developer concentration should be appropriate.
341. What are the causes of and the solutions to the problem of narrowing of outlets and loss of small outlets during printing?
A: The cause of the malfunction is: overexposure (long exposure time, excessive overexposure to dirty); improper exposure (scattered light is more); poor quality of the original dot (low density, imaginary edge width); use the forward original sunshade; Improper adhesion (insufficient pumping, original unevenness, inclusion of foreign matter); excessive development (excessive development time, excessive development temperature, excessive developer concentration, etc.); photographic plate coating is too thick.
Solution: shorten the exposure time; reduce the second exposure time; reduce the light source lamp distance; the original density is too low when the plate should be re-mastered; system reverse original is the sun; maintenance Shaiban pumping system; the original leveling, remove the original and Foreign matter between PS plates; developed according to standard development conditions (determination of development time, constant temperature at 23°C, preparation according to standard formulation) and the like.
342. PS version of the difficulty of the development of the causes and solutions?
A: Reason: PS version is of poor quality (low sensitivity, too thick coating); underexposure (short exposure time, light source decay, large lamp distance, poor light source matching, high original fog); weak developing ability (The developer concentration is too low, the developer is fatigued, the developer temperature is too low, etc.).
Solution: Increase the exposure time or replace the PS plate; retest or increase the exposure time; replace the light source; remake the original plate; add or replace the developer; the hand temperature is 22°C, and the machine temperature is 25°C.
343. What are the reasons for the dirty layout?
A: The reason why the printed version of the printing plate is dirty is due to the quality of the PS version (non-uniform coating, reversed reproduction), exposure problems, development problems, and post-processing problems.
344. What are the causes and solutions to the problems caused by exposure on the layout?
A: The cause of the malfunction: uneven exposure and insufficient (the original transparency is not good, the aging of the light source, etc.); the original with dirty, large fog, scratches; the original position of the collage tape; the original with adhesive tape marks; printing version Machine glass has scratches, dirt spots, etc.
Solution: increase the lamp distance and increase the exposure time (use the gray ladder test, adjust the exposure time), replace the light source lamp; trim or re-make the original; remove excess tape or re-makeup; change with easy-to-rubber tape; Double exposure of the scattering film; use a glass cleaner to get dirty; keep the workplace clean.
345. What are the causes and solutions to the problem of dirt caused by the development of the layout?
A: Failure phenomenon: poor development (developing time is too short, the developer temperature is too low, developer thin or fatigue fade, manual operation is not standardized, the development of the machine failure, etc.); insufficient water washing (washing time is short, the amount of water is small, etc.).
Solution: re-adjust the development time, developer temperature; add new developer or re-equipment; regulate manual operation; check and adjust the development machine; extend the washing time; increase the amount of water spray to the developer.
---From "Printing Technology"
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