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Common Technical Problems Of Offset Printing Plate

Briefly talk about the difference between UV printing plate and ordinary printing plate and CTP plate.Common Technical Problems Of Offset Printing Plate

Common Technical Problems Of Offset Printing Plate

UV ink suitability of various printing plates

Classification PS version CTP version for ordinary PS version UV ink

Brand vps-a Vpu lh-pi

The price is cheaper than the UV PS version and more expensive than the ordinary PS version,Common Technical Problems Of Offset Printing Plate

Printing resistance is not ideal:Common Technical Problems Of Offset Printing Plate

As the actual sales price is determined by each consignment point, please contact each consignment point for details.

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

(1) Cause: the exposure is insufficient, the transparency of the positive picture is poor, and the light source is aging. Treatment method: remake the positive picture and adjust the exposure appropriately

Room: retest with a gray ladder, extend the exposure time, or replace the light source lamp.Common Technical Problems Of Offset Printing Plate

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

(3) Cause: during development, poor development is caused by blister adhesion, and the developer spray hole bubbles due to blockage. Treatment method: eliminate the cause of blistering:Common Technical Problems Of Offset Printing Plate.Common Technical Problems Of Offset Printing Plate

Clean the developer spray hole.

(4) Cause: hands are not clean (fingerprint stains) when using PS version. Treatment method: keep its mouth and back slightly during operation.Common Technical Problems Of Offset Printing Plate

(5) Cause: the glue is thin. Treatment method: increase the glue concentration.Common Technical Problems Of Offset Printing Plate

(6) Cause: the adhesive layer falls off (when the adhesive layer is not dry, it shall be overlapped and stored again). Treatment method: do not keep it under high temperature and humidity.Common Technical Problems Of Offset Printing Plate

(7) Reason: after plate making, keep it under high temperature and humidity. Treatment method: 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?Common Technical Problems Of Offset Printing Plate

The dilution ratio of the developer shall comply with the proportion specified by the PS manufacturer, and a small sample plate shall be used (Fuji gray ladder shall be used to measure the concentration of the developer after exposure according to a certain amount of exposure). The developer concentration shall be managed.Common Technical Problems Of Offset Printing Plate

4. In the printing process, there is often a dirty phenomenon on the blank of the printing plate. How to solve it?Common Technical Problems Of Offset Printing Plate

(1) Cause: when printing stopped, the printing plate was not rubbed with protective glue. Treatment method: wipe protective glue.Common Technical Problems Of Offset Printing Plate

(2) Cause: the blank part of the printing plate is not wet enough. Treatment method: appropriately increase the amount of water.Common Technical Problems Of Offset Printing Plate

(3) Cause: emulsification and dirt. Treatment method: adjust the balance between ink and bucket liquid, or replace ink and bucket liquid.Common Technical Problems Of Offset Printing Plate

5. Why are film collage publishing materials prone to falsehood?

(1) Cause: improper collage of positive film. Processing method: Collage the film more than 3mm away from the image part.

(2) Cause: the developer concentration is too high. Treatment method: adjust the developer to the standard concentration.Common Technical Problems Of Offset Printing Plate

1. Briefly talk about the difference between UV printing plate and ordinary printing plate and CTP plate.Common Technical Problems Of Offset Printing Plate

Classification of UV ink suitability for various printing plates PS version CTP version for ordinary PS version UV ink

Brand vps-a Vpu lh-pi

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

Printing resistance is not ideal

As the actual sales price is determined by each consignment point, please contact each consignment point for details.Common Technical Problems Of Offset Printing Plate

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

(1) Cause: the exposure is insufficient, the transparency of the positive picture is poor, and the light source is aging. Treatment method: remake the positive picture and adjust the exposure appropriately

Room: 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 method: remove dirt with glass cleaner and film cleaner.

(3) Cause: during development, poor development is caused by blister adhesion, and the developer spray hole bubbles due to blockage. Treatment method: eliminate the cause of blistering:Common Technical Problems Of Offset Printing Plate

Clean the developer spray hole.

(4) Cause: hands are not clean (fingerprint stains) when using PS version. Treatment method: keep its mouth and back slightly during operation.

(5) Cause: the glue is thin. Treatment method: increase the glue concentration.Common Technical Problems Of Offset Printing Plate

(6) Cause: the adhesive layer falls off (when the adhesive layer is not dry, it shall be overlapped and stored again). Treatment method: do not keep it under high temperature and humidity.Common Technical Problems Of Offset Printing Plate

(7) Reason: after plate making, keep it under high temperature and humidity. Treatment method: 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 shall comply with the proportion specified by the PS manufacturer, and a small sample plate shall be used (Fuji gray ladder shall be used to measure the concentration of the developer after exposure according to a certain amount of exposure). The developer concentration shall be managed.

4. In the printing process, there is often a dirty phenomenon on the blank of the printing plate. How to solve it?Common Technical Problems Of Offset Printing Plate

(1) Cause: when printing stopped, the printing plate was not rubbed with protective glue. Treatment method: wipe protective glue.Common Technical Problems Of Offset Printing Plate

(2) Cause: the blank part of the printing plate is not wet enough. Treatment method: appropriately increase the amount of water.Common Technical Problems Of Offset Printing Plate

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

5. Why are film collage publishing materials prone to falsehood?Common Technical Problems Of Offset Printing Plate

(1) Cause: improper collage of positive film. Processing method: Collage the film more than 3mm away from the image part.Common Technical Problems Of Offset Printing Plate

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

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