Printing is a process of mass reproduction. It is a kind of high-speed, continuous production. Its main purpose is to produce qualified and high-quality prints. Due to the large number of processes, there are many factors that affect the quality of the printed matter. The quality problem is often tens of thousands of scraps. In actual production, a large number of scrapped finished products or semi-finished products also occur from time to time.
Example 1: A printing house prints a product brochure for a special wire factory using a double-sided coated paper with a basis weight of 157 g/m2. The front and back sides are all in color printing, and the text description below one of the pictures should read "Paper Shell." The delay in the use of electric detonators" was due to proofreading mistakes as "paper shells expired electric detonator cords", which was just contrary to the original intention, resulting in economic losses of nearly 100,000 yuan.
Example 2: When printing in the printing shop of a printing plant, mistakenly remove the outer border lines of a few lines of text on a black plate as film collage traces. This will only be discovered when some products of the previous printing process enter the next process. The problem has to be reworked, and the missed border lines will be reprinted. Fortunately, the overprinting does not affect the accuracy of the graphic and text, but the waste of manpower, material resources, and product consumption brought about by the overprinting of the border line is not small, and delays the printing of other products, which affects the normal production.
Example 3: A printing company prints a product label of a food company. Because there are many varieties, different flavors are required to be distinguished by different ink colors, and the pictures are roughly the same, with only the difference of "xx taste". As a result, the printing plate was not carefully inspected during the printing process, and the error in the machine loading caused the product to be scrapped. This not only caused economic loss, but also delayed the delivery date, which affected the normal use of the label by the food company.
Example 4: A certain ticket printing house prints a batch of bills, which are covered with kraft paper and the head is tipped when the finished product is cut. In one fell swoop, dozens of bills became scrap. Because the bills were coded and the numbers couldn't be used without continuity, the scrapped parts had to be reprinted, and the entire production process was confusing because of the number problem.
There are many similar examples in actual production. Every link in the printing process is directly related to the final quality of the print, so no errors are allowed. From this we can see that the quality control of prints goes through each process and it is of great importance to sell to every operator.
To avoid the occurrence of printing quality accidents, the following measures can be taken: First, the self-test of each process in the copying process. The second is the mutual inspection between the upper and lower related processes during the replication process. Specifically speaking, each operator is required to perform routine inspections, but it is also necessary to carefully inspect the quality of the previous process, eliminate all kinds of hidden accidents, identify problems as early as possible, and minimize losses.
Here are some of the key procedures to discuss the issues that should be noted when performing quality checks in daily work.
The basic responsibility of the proofreading proofreader is to take responsibility for the manuscript. Through proofreading, the content on the proof meets the requirements of the manuscript and corrects all typographical errors. If any omissions or doubts are found in some places of the manuscript, the proofreader should give his opinion and be approved and corrected by the deputy seal unit. , you cannot modify the manuscript on the proof. In short, proofreading should be faithful to manuscripts, without neglecting any possible mistakes. “One-valued workmanship” is not an exaggeration for proofreaders. Proofreading is an important part of ensuring the accuracy of printed content.
Shaiban printing is the correct transfer of the image on the original plate to the printing plate. The original version is a graphic product made from the previous process, and it is a copy of the printing process. Therefore, the inspection of the original before printing is of utmost importance. Its inspection contents mainly include:
1 original name. Whether the content and the craft bill are consistent;
2 original specifications. Whether the quantity is in line with the craft bill;
3 whether the original yin and yang, positive and negative directions meet the printing process requirements;
4 whether the original quality and collage quality meet the printing requirements;
5 Are the necessary rules and various marks (such as label, color, etc.) complete? Are 6 sets of color registrations accurate?
Whether the 7-page layout is clean, whether there is residual waste tape, dirt, etc.; whether the Japanese version is flat and crease-free. Scratches and so on.
Checking the quality of printing plates after printing is an indispensable process. It can be said to be an important part of comprehensive quality control. Its purpose is to prevent unqualified printing plates from entering the printing process, causing unnecessary waste and rework. The main contents of the quality check of the plate:
1 inspection of the appearance quality of the printing plate: It includes the flatness of the plate, the cleanliness, and the uniformity of the wiper.
2 plate layout specifications check: It includes layout size, graphic location, mouth size. Folding relations, etc., control copying process sheet item by item inspection. The required plate size is accurate, the error is less than 0.5mm, the dimensional error between the chromatic plates is less than 0, 1mm, and the image ends are not sunbathing.
3 check the content of the text: check the content of the graphic with the original text is complete, with or without the phenomenon of damaged words, characters, lack of words; for multi-color version also check whether the color version is complete, with or without lack of color or sun drying phenomenon; The rules are complete and complete.
4 Check the quality of outlets with a magnifying glass to see if the outlets are full. Smooth and so on.
5 graphic and textual inspection: With the aid of a magnifying glass and a control strip, check the brightness of the printing plate according to the quality of the printing plate and the printing plate respectively. in. Dark dot reproducibility of different tone areas, too dark, too shallow printing plate can not be printed on the machine.
Printing the newly acquired printing plate will often affect the quality due to various factors (such as process operations, production environment, and the quality of workers) in the printing plate production process. Plates should be inspected before being placed on the machine, so that responsibilities can be separated and problems can be avoided between departments. Except for the smelting personnel and full-time personnel, the operator has the responsibility and obligation to review and inspect the printing plate quality. Only qualified plates can be used for loading. The contents of the inspection mainly include color. Depth of shades, virtual reality, error-free text, incomplete lines, and whether the plate format, cleanliness, and flatness meet the requirements.
In addition, in the printing production process to implement "three hard", diligent ink bucket. Diligently look at the layout of the water and diligently look at the proofs. "Sanqin" is an effective quality control measure in the printing process. Diligent ink fountain. Diligently looking at the surface of the sheet is an important task for maintaining the consistency of the ink of the printed material; diligently looking at the proofs requires the operator to always remove the printed sheets for inspection, mainly the accuracy of the printing position and the inspection of the image quality. The shorter the inspection interval, the better. This can greatly reduce the scrap rate.
The above only listed several important aspects of the printing process and analyzed them. The occurrence of printing quality accidents must be conducted in many ways and with multiple channels. Each operator should have a high sense of responsibility for his work. Only the joint efforts of all staff members can improve the quality of printed matter and reduce the occurrence of quality accidents. Enterprises create higher profits.
Dirty traces of printed products in the diagnosis of a case <br> Four-color machine finished the cover of the book, and then printed by the J2108 type monochrome machine seal two, closed three, sometimes this happens:
When the back of the print is a large solid patch or a large area shading, there will sometimes be a nearly 2 cm long buoy on the surface, and the buoyant color will be blue and red. This situation is often misunderstood by some operators as the four-color machine caused by the printed product does not dry, dirty back. In fact, when you check the unprinted paper on the feeder, you will find that the back of the paper is not dirty. Careful observation of the dirty marks, the feeling of dirty marks from the front of the graphic block, dragged down to the back caused by the pressure, so think of the paper above the roller brush wheel pressure is too heavy. Adjusting the pressure lightly, the prints are missing. Sometimes the dirt is dirty because it is mainly because some of the printed products do not dry, it is easy to cause people's misjudgments.

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