300. What are the operating points of manual development?
A: (1) Pour the developer into a container, dissolve it thoroughly with warm water, and mix it thoroughly before use. Note the developer's temperature and other development conditions.
(2) Using gasoline to wipe the marks left by the imposition adhesive tape on the stencil, and quickly and steadily place it in the groove with the photosensitive surface facing upward and shake the liquid to ensure that the plate is uniformly developed;
(3) It cannot be developed by pouring medicine, and it cannot be wiped with flannel.

301. What is the role of revision?
A: The role of the revision is to make up for the incompleteness of the printing plate graphic and text due to the defects of plate material or improper operation. Dirty spots, tape marks, redundant gauge lines, bottom ash and other faults appear on the plate to ensure the printing plate is blank. Part of the hydrophilicity and the cleanliness of the layout. Revisions include removing dirt and repairs.

302. What are the main points of work in addition to dirty?
Answer: There are three kinds of methods for removing dirty parts of the positive PS version: solvent method, photochemical method and tool method.
(1) In addition to the dirty of the solvent, the special dirt remover is used to remove dirt. In the state of slight wetness on the layout, use a brush or a dirty pen to paint the dirty agent and the dirty paste directly on the dirty spots to dissolve the dirty spots, and then rinse the plate with clean water. The dirt removing agent consists of a solvent for the ink and the photosensitive layer, a thickener for preventing diffusion of the dirt removing agent, a wetting agent for enhancing the dirt removing effect, and a dye for facilitating observation of the dirty work.
(2) Photochemical removal of dirt is the use of double exposure to remove dirt after main exposure. This method is suitable for removing dirt from the layout with a large amount of dirt. Including the scattering exposure in addition to the dirty and dirty except the dirty cover plate.
(3) The removal of dirt from the tool refers to the use of a scraping knife, a cutting needle or a pumice bar, and a dirty pen to remove the dirt by means of scraping, engraving, or grinding. In addition to dirty, we must first moisten the surface of the plate with water, and then scrape off the dirty spots. However, this method is easy to damage the layout, causing oxidation and dirty.

303. What is the main point of the repair work?
Answer: Patching is a corrective method for adding faults to incomplete faults in graphic parts, such as lack of paintings, broken lines, and missing points. The specific method is to first wash the repair site and blow it with hot air, and then trace the repair liquid, and then use hot air to dry the revised plate.

304. What is the purpose of baking?
A: The purpose of the roasting plate is to enhance the stability of the graphic and textural basis, corrosion resistance and mechanical strength, so as to improve the printing plate's resistance to printing force, and reduce the number of printing plate and printing plate changing. Generally, the low printing number (under 100,000 printing) ) No baking version is required.

305. What are the main points of work for baking?
A: Before roasting the plate, a clean protective layer of baking solution should be evenly applied on the neat plate, about 20 to 30 ml, dried, placed in a baking plate, and roasted at a high temperature of 230 to 250°C. 4 to 8 minute. After the baking is completed, it is cooled naturally and secondary development is performed to clean the layout.
306. What is the role of ink extraction?
A: The ink is rubbed on the plate to develop a layer of developing ink, which can enhance the lipophilicity of the graphic part and protect the photosensitive layer; it plays a role in protecting the light from light and preventing the photosensitive layer from decomposing; it makes the picture and text visible and easy to view the layout. Quality and development; can extend the printing plate storage time.

307. What is the main point of the job?
A: The ink should be printed in a slightly wet state (not too wet). Use a soft cloth or sponge to wipe the parts until all are evenly coated with the developing ink. Rinse with water to remove excess developing ink and blanks on the plate. The developing ink. In general, plates with poor lipophilicity and printing plates with long storage time must be inked.

308. What is the function of the wiper?
A: The first is to protect the layout, to avoid scratches on the layout, to prevent direct contact with the corrosive, oxidizing gas or dirt and dirt, etc., and to enhance and protect the hydrophilicity of the blank.

309. What are the main points of work for the protective rubber?
A: Under the slightly wet state of the plate, use a sponge and a soft cloth to uniformly spread the protective glue (such as gum arabic) with a concentration of 10 to 12 Baume on the plate, and blow or dry at low temperatures. Pay attention to the glue layer must be thin and uniform, after the glue must make the layout film fully dry, wiping station should be kept clean. Do not use deteriorating protective glue.

310. What is the quality standard for printing on the positive PS version?
Answer: The print quality standard of the positive PS version: the dot reproducibility is good, 2% of the cusps are not lost, 97% of the dots are not glued, the intermediate dots are not reduced by more than 3%, and the multi-version repeat error is not More than 3%. The printing plate is full of dots on the Internet. The edges of the dots are smooth and free of burrs. The width of the imaginary edge is not more than 4 μm. The non-baked version of the printing force should reach 80,000 impressions or more. The appearance is smooth, no creases, no scratches, and the layout is clean. Graphical position is correct and overprint performance is good.

311. What is the purpose of pre-printing plate quality?
Answer: (1) Inspect and identify printing plates that do not meet printing requirements due to operational errors and changes in natural conditions, and exclude them from printing on the machine;
(2) Identify the printing plate color, so that the printing color and the required printing plate are completely consistent, so as to avoid color errors and make the product obsolete;
(3) For the printing department can play a supervisory role.

---From "Printing Technology"