Corrugated Boxes Of Foldable PS version of the sunning process three links

Corrugated Boxes Of Foldable PS version of the sunning process three links

 

In the printing industry (whether it is printing paper or printing iron), PS plate as a transmission medium for offset printing, it is usually aluminum alloy plate, thickness of 0.15 ~ 0.30mm, the surface is coated with a layer of photosensitive liquid; According to different use occasions and requirements, the size can be selected or ruled by itself. In the iron printing industry, the printing pattern depends on the plate cylinder, rubber cylinder and stamping cylinder three cylinders under the appropriate printing pressure, through the ink balance principle to transfer to the surface of the iron sheet, which the quality of the plate depends on the PS plate of the printing process and other influencing factors, it should be said that the plate quality is a prerequisite and fundamental for the quality assurance of printing products.

 

This article only explains and discusses some details that should be paid attention to in the process of drying the PS plate.

 

The drying process of PS version can be simply illustrated as three basic links, that is, exposure - development - adhesive.

 

1. Exposure

Exposure: The photosensitive PS plate is placed on the printing machine work table, the negative is placed, and the pattern on the negative is displayed on the PS plate by two exposures of main light and light input (Note: The exposure conditions of each type of PS plate recommend the use of ① light source of 3KW iodogallium lamp ② lamp plate distance of 1m).

 

The working procedure of printing is automatic control, but pay attention to the following basic details, mainly including:

1. The position of the teeth or the bite should meet the process requirements, and the version should generally be taken. (1) When the printing plate is the same size as the iron sheet, it should be noted that the blank in front of the page is ≥1mm and the cross line should be exposed, and the + word line should be exposed on both sides; (2) If the size of the iron sheet is surplus, it is necessary to negotiate with the merchant to clear the empty position of the remaining iron; Customers with special requirements for excess iron should meet the corresponding standard requirements in order to reserve when printing; (3) When the plate size exceeds the size of the iron sheet, you can first expose it and then use the iron sheet to cover the original position and expose it again to remove the excess image. These are special cases, and the general version should be in line with the size of the iron sheet, which is both economical and reasonable and in line with the process requirements.

 

If 0.23×712×512 / MRT4 tinplate is used to make the printing path of the crown cover, the plate core size is 712×505mm2, and the front of the plate can be appropriately left blank for 1 ~ 3mm when printing, and the tooth position can be left 4 ~ 6mm gap (this example refers to the Japanese Fuji Machinery PRIMEX-F450 printing machine plate description).

 

2. Before starting the printing machine, check whether the working table has foreign bodies such as ruler and revision knife, otherwise it will burst the glass frame of the machine.

 

3. After the PS plate is placed to be sized, it should be noted that the vacuum outlet on the side of the machine should not be covered.

 

4. Setting of exposure time: the main exposure time is usually set at 90 ~ 100S, and the auxiliary light is 15 ~ 20S. (1) The exposure time is too long, the pattern on the PS plate is brittle, easy to fall off and lose part of the network cable, and the printing plate has poor printing resistance; (2) Exposure time is not enough, insufficient exposure will appear pattern color light, empty and unreal; (3) When the lamp performance deteriorates for a long time, the exposure time can be appropriately extended or replaced.

 

5.PS version of the take: should be careful not to bend to make a "dead mark", otherwise it is easy to appear blurred pattern, empty ink, poor coloring when printing.

 

Second, development

The PS plate that is about to be exposed is placed flat in the developing tank, so that the developer is fully wet with it, and about 1 minute later, take out the plate on the washing table and rinse the dissolved coating with water, so as to show the "image". The following points should be noted when developing:

 

1. Formulation ratio of developer and water. In general, when purchasing PS version, a certain developer is distributed with the version, and the ratio of developer and water is best described as slightly greater than or equal to the proportion of the original concentrate, especially relative to the summer.

If the developer concentration is too high, the effective network will be cleared, and the concentration is not enough, the development time will be extended, which is easy to make the layout dirty and affect the durability of the PS version.

2. Control of development time. Under normal circumstances, it is appropriate to place the PS version in the liquid tank for about 1 minute (the layout will appear obvious bubbles during development). Too long development time will remove the "image" on the page, and the page will be dirty if the time is not enough.

 

3. If there are excess spots and images on the page after development, you can remove them with retouching paste, and then rinse with clean water (when retouching, you can dip a brush into an appropriate amount of retouching paste and gently apply it on the excess image or spots, stay for a while and rinse off with water).

 

4. Developing temperature. It is suitable to be carried out at room temperature (23±2℃), and too high room temperature will make the plate dot reduction worse; Too low temperature will reduce the development ability.

 

5. Development should be carried out in a dark room to avoid natural light. [next]

 

Three, protective glue

After development, the image graphic part and non-image graphic part of the PS plate surface should be coated with a layer of Arabic gum to prevent the printing plate from being dirty and the plate chafing during the printing process. Although the plate protection work is simple and easy, it should also be noted in actual operation, mainly in the following two aspects:

 

1. Apply glue:

(1) After the PS plate is cleaned with water after development, gently wipe off the excess water on the surface with a rubber scraper or sponge. When applying, you can use a non-depilatory cotton towel or sponge to dip an appropriate amount of protective glue on the page to wipe it vertically and horizontally, so that it can be uniform and thin (too thick and easy to peel off, too thin or uneven can not protect).

 

(2) After gluing, the version is placed on the workbench to dry (can be used in summer with fans, winter with far infrared, stool storage and use, with conditions, the baking machine can be used for better effect).

 

2. Clean plate: For re-used plates, after each use, gasoline or ink cleaning agent, cleaning paste, etc. can be used to clean the ink on the surface, so that it reveals the "primary color" and then glue. In addition to paying attention to the above three basic links, we should also understand the daily version protection and school version common sense closely related to it.

 

(1) Proofreading: proofreading is to check and proofreading the original sample of the negative on the school board, mainly including: ① the size of the manuscript; ② Core size; ③ Whether the "+" line and the center line of the layout coincide; ④ Whether the graphic cable is clear; ⑤ There are no scratches on the back of the negative (if necessary, use opaque adhesive tape or drawing pen, add pen, and remove pen to repair the layout).

 

Note: ① the plate size should be consistent with the size of the iron sheet; ② The page should have the "+" word and the center line, which is the basic sign of the standard version; (3) The printing plate is usually marked with Y, M.C, K (representing yellow, red, blue, black) four basic marks, and there are -10% ~ 100% of the network cable above the layout to indicate the sparse and dense network cable and the main pattern of the contrast.

 

(2) Storage and protection of printing plates: ①PS plate storage should avoid humidity and high temperature, recommended storage conditions of 10 ° C ~ 30 ° C, relative humidity is not greater than 65%, otherwise the page is easy to alkali damage PS plate; ② The room should be kept clean and dust-free to prevent direct sunlight; ③ When storing reusable printing plates, pay attention to the layout of the opposite side, while the middle is best separated by paper lining; ④ In the printing, such as dirty spots, scratches and other phenomena, you can shut down the page brushing PS plate cleaning solution and add a small amount of water in the bucket, in order to improve the print-resistance of the plate to obtain good printing quality.

 

In short, as a supplementary work of printing process preparation, the process is relatively simple, but the quality of the plate directly affects the quality of the printing product.

 

In summary, in the actual operation process, in addition to paying attention to the basic operating links in the printing process and the various factors that affect the quality of the printing process, the status and role of the printing plate in the iron printing process can not be ignored, because there is no qualified standard version, and then the exquisite pattern will not be presented.