Factory Price OEM Spiral 100 Sheets Notebook Printing Stock How To Check The Quality Of The Film

Factory Price OEM Spiral 100 Sheets Notebook Printing stock How to check the quality of the film

 

First, the importance of film

 

Film plays a connecting role in printing and is an indispensable link in printing. We all know the printing process is: manuscript → plate making → output film → proofing → printing → post-processing → finished products. Although the development of digital direct platemaking technology CTP is very fast, but it will take some time for widespread application. Now the traditional printing process film is still one of the key links of printing, no film can not print, can not print.

 

Second, check the purpose of the film

The earliest printing film was completed by photographic plate making, human factors and technical level have a great impact on the quality of the film, but now the printing film is generally the phototypesetting output machine interprets the produced files into digital image lattice data through rip, and then outputs the typesetting results to the film to complete. The film quality is affected by the degree of software rip perfection and the working experience of the production personnel, as well as the working experience of the scheduler. Production personnel and scheduler's understanding of the software determines whether the output film can be printed normally. The error rate is very high, so every printing company and pre-press company must check the film. The purpose of checking the film is to eliminate all kinds of adverse factors in the printing process or to avoid some possible printing process errors.

 

3. Tools for checking film

Magnifying glass, scale, Standard chromatography, oil pen, densitometer, dot Angle ruler [next]

 

Four, check the film steps

1. After getting the film, first confirm whether the film quantity is consistent with the use requirements, which generally includes monochrome film, four-color film, spot color film, and the film on the back is enough.

 

2. On the premise that the amount of film is appropriate. Check the film sheath. Under normal circumstances, on the plate with one of the large area of color as the benchmark, the other three pieces of film, in the normal thickness of the sleeve line is not allowed to have more than half line error. Text, line, image edge overlap should not be double.

 

3. Next, distinguish the color of each film. Some film color label CMYK, so don't talk about. Some film with no color code, you can use the film color block against the color on the original feature of the color block for identification, and marked with oil pen. If the film in question needs to be rearranged, it should be noted that the first and second rearrangement should also be marked differently.

 

4. Check film size. According to the work order to check whether the size of the film is the same as required, output film should be all the center line, sleeve line, cut line added. If there is a proof, according to the requirements of the finished product to do the process proof. If there is no proof sheet, check the dimensions according to the finished size requirements. Each relevant size must be checked item by item. If it is a handbag, cover or medicine box and other informal size requirements, more carefully check whether there is no sticky mouth, folding, bottom of the box, bleeding, white edge left enough. Finally, check whether the size of the film and the size of the bite can be printed normally (13mm on each side of the big turn plate, if the paper is not allowed, two sets of plates should be exposed).

 

5. It is also important to check the way of composition. The way of making up generally has self - copy version, big turn over version and big set version. What kind of format according to the specific situation, since the copy and the large plate should be symmetrical in the middle line, check whether the distance between the middle line and both sides is equal. The direction of the plate should be relative, the error of the front and back of the large plate should be within 1l, and all the corresponding lines can be matched. Also note that some of the need for post-binding or folding parts of the folding hand must be correct.

 

6. After the correct composition, you should also check the layout and text content. Check whether the changes made by the customer are correct, and then sample check whether the layout arrangement and content are consistent with the original manuscript. Careful proofreading should be carried out to prevent the mistakes made over and over again. The location of the Mosaic map must be accurate, and the content can be connected.

 

7. If there is only plastic cloth with color spray without proofing, it is necessary to check whether the color of the color plate of the four-color film is consistent with the color separation of the color spray draft, and the color on the color spray draft should correspond to the corresponding film.

 

8. If it is a rearrangement or change of arrangement, apply the new film and the old film colored version one by one check, the changed place has been changed or the color density or dot percentage has changed, the old and new film should be marked with oil pen. [next]

 

9. Carefully check the colorful flat net, transition net, there are no scratches on the picture, dirty points, virtual spots, laser lines, creases, stray points, whether the transition is smooth, etc.

 

10. With experience, if you cannot determine whether the density of the film can meet the printing requirements, use a densitometer to test the film, phototypeset film 3.4 or above, electrical fragment 3.8 or above.

 

11. If no sample is made or there are not obvious moire marks on the sample, check the Angle of the network cable. Generally, the Angle of the network cable is 0°, 15°, 45°, or 75°. If there are two color version of the network cable Angle is consistent, there must be moire, must change the Angle of the network cable.

 

12. If you feel that the film network cable is rough or the proofing dot is large, check whether the number of hair lines meets the needs of live parts. Offset paper printing in general 130l, newsprint in general 100l, coated paper in general 175l, high-grade printing in general 200l.

 

13. If there are some changes in the film after the completion of the inspection, it is best to use a striking pen to outline, clearly indicate the change place, if manual can not be changed, please re-hair film. Otherwise, the need for a long time, printing is difficult, easy to make mistakes, customer requirements are high, may not be able to do.

 

14. The excess corner lines within the finished line must be removed.

 

15. Some of the above checks may have been avoided in the production process, while some may not be used. It is too tedious.

 

16. Under normal circumstances, customers are required to proofing, proofing proofs can be found after a lot of problems and solve a lot of problems, combined with the film basically can ensure the normal printing on the machine. Film screen inspection is particularly important, should pay attention to, if there is a point is not suitable, the printed matter reflects the problem is uneven or halo.