Common technical problems of the most popular offs

Common technical problems of offset printing plates

release date: Source: China Packaging

various technical problems often occur in the packaging and printing industry. Today, China's paper industry starts with technical problems, and introduces offset printing in detail

briefly talk about the difference between UV printing plate and ordinary printing plate and CTP plate

UV ink suitability of various printing plates

classification ordinary PS UV ink PS CTP version

brand vps-a Vpu lh-pi

price is cheaper than UV PS version and more expensive than ordinary PS version

printing resistance is not ideal. Good

as the actual sales price is decided by individual consignment points, please contact individual consignment points for details

2. What are the main reasons why printing plates are easy to get dirty

(1) reason: insufficient exposure, poor transparency of Yang picture, aging light source, treatment method: Remake (2) thinking about the planned construction of the city's Trade Logistics Park Yang picture, appropriately adjust the exposure time

time: retest with a gray ladder, extend the exposure time, or replace the light source lamp

(2) cause: the glass of the plate printer is a little dirty, and there is adhesive tape residue on the positive picture. Treatment: remove dirt with glass cleaner and film cleaner

(3) cause: during development, poor development is caused by blister adhesion, and the developer orifice bubbles due to blockage. Treatment: eliminate the cause of foaming: the developer spray hole should be cleaned

(4) reason: hands are not clean (with fingerprint stains) when using PS version. Treatment: keep the mouth and back part during operation

(5) cause: thin glue. Treatment method: increase the glue concentration

(6) cause: the adhesive layer falls off (when the adhesive layer is not dry, it should be overlapped and stored again). Treatment: do not keep it under high temperature and humidity

(7) reason: after plate making, keep it under high temperature and humidity. Treatment: do not store under high temperature and humidity

(8) cause: the developer concentration is too low, and the development is not complete. Treatment method: adjust the developer to the standard concentration

3. How to improve the development quality of positive PS version

the dilution ratio of the developer should respect the proportion specified by the PS manufacturer, and use a small sample plate (use Fuji gray ladder to expose the PS plate after a certain amount of exposure, which can measure the concentration of the developer.) Manage the developer concentration

4. In the printing process, there is often a dirty phenomenon on the blank of the printing plate. How to solve it

(1) cause: when printing stops, the printing plate is not rubbed with protective glue. Treatment: rub protective glue

(2) cause: the blank part of the printing plate is not wet enough. Treatment method: appropriately increase the amount of water

(3) cause: emulsification and dirt. Treatment: adjust the balance between the ink and the bucket liquid, or replace the ink and the bucket liquid

5. Why are film collage publishing materials prone to falsehood

(1) cause: the positive film is not pasted properly. Processing method: paste the film more than 3mm away from the image

(2) cause: the developer concentration is too high. Treatment method: adjust the developer to the standard concentration

1. Briefly talk about the difference between UV printing plate and ordinary printing plate and CTP plate

suitability classification of UV inks for various printing plates ordinary PS UV inks PS CTP brand vps-a Vpu lh-pi

price is cheaper than UV PS version and more expensive than ordinary PS version

printing resistance is not ideal good

as the actual sales price is decided by the individual consignment points, please contact the individual consignment points for details

2. What are the main reasons why printing plates are easy to get dirty

(1) cause: insufficient exposure, poor transparency of positive pictures, aging light source, treatment method: weight 8 It can realize the fast/slow rise and fall adjustment of the beam when the sample is clamped. Make a new positive picture, and properly adjust the exposure time

: test again with a gray ladder, extend the exposure time, or replace the light source lamp

(2) cause: the glass of the plate printer is a little dirty, and there is adhesive tape residue on the positive picture. Treatment: remove dirt with glass cleaner and film cleaner

(3) cause: during development, poor development is caused by blister adhesion, and the developer orifice bubbles due to blockage. Treatment: eliminate the cause of foaming: the developer spray hole should be cleaned

(4) reason: hands are not clean (with fingerprint stains) when using PS version. Treatment: keep the mouth and back part during operation

(5) cause: thin glue. Treatment method: increase the glue concentration

(6) cause: the adhesive layer falls off (when the adhesive layer is not dry, it should be overlapped and stored again). Treatment: do not keep it under high temperature and humidity

(7) reason: after plate making, keep it under high temperature and humidity. Treatment: do not store under high temperature and humidity

(8) cause: the developer concentration clamping arm can be set according to the experiment, and the development is not complete. Treatment method: adjust the developer to the standard concentration

3. How to improve the development quality of positive PS version

the dilution ratio of the developer should respect the proportion specified by the PS manufacturer, and use a small sample plate (use Fuji gray ladder to expose the PS plate after a certain amount of exposure, which can measure the concentration of the developer.) Manage the developer concentration

4. In the printing process, there is often a dirty phenomenon on the blank of the printing plate. How to solve it

(1) cause: when printing stops, the printing plate is not rubbed with protective glue. Treatment: rub protective glue

(2) cause: the blank part of the printing plate is not wet enough. Treatment method: appropriately increase the amount of water

(3) cause: emulsification and dirt. Treatment: adjust the balance between the ink and the bucket liquid, or replace the ink and the bucket liquid

5. Why are film collage publishing materials prone to falsehood

(1) cause: the positive film is not pasted properly. Processing method: paste the film more than 3mm away from the image

(2) cause: the developer concentration is too high. Treatment method: adjust the developer to the standard concentration

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