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What are the main printing processes of a printing plant?

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What are the main printing processes of a printing plant?

Date of release:2016-07-27 Author:admin Click:

1. Pre-press preparation for the printing plant


Preparations include: paper humidity control, ink preparation, dampening solution preparation, printing plate inspection, printing pressure adjustment, etc.


Paper humidity control is mainly to prevent the uneven moisture content of the paper caused by the environmental climate and cause the paper to deform and generate static electricity. This phenomenon is absolutely forbidden in printing.


2. Trial printing with printing plant


After the pre-press preparations are completed, you can load paper, plate, and start-up debugging. During start-up operation, the stainless steel tube should be adjusted to the paper feeding mechanism, paper delivery mechanism, ink feeding device, water feeding device, printing pressure and other aspects to ensure smooth paper feeding, moderate water supply and ink supply, and suitable printing pressure. , To print high-quality prints. After the above work is ready, run the machine for a while to make the ink supply and water supply moderate and even, and then add some printing paper on the paper feeding table for trial printing. If it is multi-color printing or chromatic printing, registration adjustment work is also required to determine whether the layout position is appropriate, whether the graphics and text are skewed, whether the head, foot, left and right size and direction are registered (usually register with the rule line) adjust). After the registration operation is completed, trial printing is started, and a few samples are printed for quality inspection.


Ink preparation work includes the preparation of special inks and the addition of some additives to conventional inks. If the viscosity of the ink is not suitable, you should add a varnish to increase or decrease the viscosity; if the ink is not dry, you can add a dry bath agent. Adding various additives must be based on the process, equipment, paper and environmental temperature, etc., and the amount should be appropriate.


The inspection of the printing plate includes: the inspection of the type and color of the printing plate, the thickness of the printing plate, the inspection of the size of the printing plate, the inspection of the rule line, the inspection of the depth of the printing plate, and the quality of the graphic and text of the layout, whether there is dirt Inspection of damage, scratches, etc.


Printing pressure adjustment: According to many factors such as printing plate thickness, paper specifications, blanket thickness, lining material thickness, printing process requirements and many other factors, select the appropriate cylinder lining so that the printing pressure meets the printing process and quality requirements.


3. Formal printing by the printing plant


Before the formal printing, add some pass paper, and reset the counter to zero after the pass paper is printed. Medium frequency induction heating equipment should always be sampled and checked during printing. Pay attention to changes in water, ink changes, printing plate endurance, blanket cleanliness, and whether the printing machine's oil and air supply conditions and operation are normal.


Four, post-press processing


After printing every day, or when each batch of prints is completed, post-printing processing operations must be carried out. Mahjong includes: cleaning of ink fountains, ink rollers, water rollers, blankets, and impression cylinders, and cleaning of printing plates and printed sheets. Handling and maintenance of printing presses, etc.


V. Special printing process for cover and color pages 1. Film lamination process is a process in which printed matter and plastic film are heated and pressurized by the dry cleaners.


The surface of the paper printed matter after being coated is smoother and brighter, and the gloss and abrasion resistance of the printed matter are improved.


2. Embossing embossing process is a process that uses concave-convex molds to produce plastic deformation of printed matter under a certain pressure, and the Shanghai Printing Factory thus performs artistic processing on the surface of the printed matter. After embossing, the surface of the printed matter presents patterns and textures of different depths, with obvious relief three-dimensional feeling, which enhances the artistic appeal of the printed matter.


3. Die-cutting The die-cutting process is a forming process in which a special die-cutting knife is made according to the design requirements of the printed matter, and then the printed matter or other substrates are rolled and cut into the required shape or cut under pressure.


4. UV glazing UV glazing is ultraviolet glazing. It is made by applying a special UV special coating agent precisely and evenly to the performance or local area of the printed matter, then irradiating it with ultraviolet rays, and then curing it in a dry bath at a very fast speed.


5. Hot stamping Hot stamping uses gold and silver foil as materials. With the help of a certain pressure and temperature, the printed matter and the hot stamping foil are pressed against each other in a short time, and the metal foil or pigment foil is pressed against the area on the hot stamping template. The process of transferring to the surface of printed matter. The area of the printed matter after hot stamping will show a strong metallic or other texture.


 

Humen Printing Factory



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