Roto Printing Machine

Roto Printing Machine

The main feature of the roto printing machine is that the graphics and text on the printing plate are concave, and the blank part is convex, which is exactly the opposite of the layout structure of the relief printing machine. When printing on a roto printing machine, the entire surface of the plate cylinder is inked, and the ink on the blank part of the plate is scraped off with a squeegee, leaving the ink in the graphics and text, and then passing through the paper, which is pressed on the back of the paper by the impression cylinder The ink in the concave part is directly transferred to the paper surface, and finally the printed matter is piled up or rewound through the paper collection part.

Product Details

Roto Printing Machine
Description of roto printing machine:

The main feature of the roto printing machine is that the graphics and text on the printing plate are concave, and the blank part is convex, which is exactly the opposite of the layout structure of the relief printing machine. When printing on a roto printing machine, the entire surface of the plate cylinder is inked, and the ink on the blank part of the plate is scraped off with a squeegee, leaving the ink in the graphics and text, and then passing through the paper, which is pressed on the back of the paper by the impression cylinder The ink in the concave part is directly transferred to the paper surface, and finally the printed matter is piled up or rewound through the paper collection part.

Rotary gravure was once the main photo function of newspapers, but roto printing machine is still used for the packaging of commercial printed magazines, postcards, corrugated paper (cardboard) and other products.

 

 

Technical parameters of roto printing machine:

Model

JHAY-6800C

JHAY-B61100C

Printing width

800mm

1100mm

Material width

830mm

1130mm

Printing cylinder diameter

φ100-350mm

φ100-350mm

Printing speed

150m/min

150m/min

Unwind diameter

600mm

600mm

Rewind diameter

600mm

600mm

Register accuracy

±0.1mm

±0.1mm

Total power

130KW

144KW

Weight

18000KG

19000KG

Dimension

11000*2500*2500mm

11000*2700*2500mm

 

The above are the technical parameters of our two main products. Our roto printing machine has many similar products, which can be purchased according to demand.

According to the number of colors printed once by the unit, the roto printing machine can be divided into single color, four color, five color, six color and so on.

 

 

 

 

Features of roto printing machine:

1. The products of roto printing machine have the advantages of thick ink layer, rich layers, strong three-dimensional sense and good printing quality.

2. The ink layer dries quickly without powdering, and can enter the next process. Easy to use and extremely high production efficiency.The version is deep, the net is fine, the ink consumption is large, and the performance is very strong.

3. The roto printing machine is dry overprinting, not interfered by fountain solution, and the image quality and paper size are relatively stable.

4. The printing material has wide adaptability and can be used to print exquisite trademarks, color pictures, securities, decorative products and color newspapers.

5. The printing effect of roto printing machine is good, and the ink layer is thick. Generally speaking, the thickness of the printing ink layer is about 2ym, the relief printing is about 7m, and the rotogravure printing can reach 9-20Pm, second only to screen printing. The thick ink layer can produce many special effects, such as powerful three-dimensional effects, the advantages of printing on large-format rough paper, plastic film and metal foil.

6. High printing resistance, suitable for batch printing. Our roto printing machines are of good quality, durable and made for mass production.

7. Overprinting or indirect partial coating method is used when printing multi-colors, so that inks of various colors are distributed on the relevant parts of the printing plate surface as needed. The basic printing principle of multi-color printing is the same as that of printing monochromatic.

 

 

 

 

 

 

 

FAQ about roto printing machine:

 

1.What are the components of a roto printing machine?

2.What are the types of roto printing machines?

3.What is the working principle of roto printing machine?

4.What are the precautions for using roto printing machine?

5.What are the common faults of roto printing machines? (With exclusion method)

 

 

1.What are the components of a roto printing machine?

The main part of the roto printing machine is composed of paper feeding, ink feeding, printing, drying and receiving paper.

① Paper feeding part: There are separate sheet-fed roto printing machine and web roto printing machine, so paper pile type paper feeding and roll paper feeding are produced;

② Printing part: There are 3 types of vertical plate, horizontal plate and skew plate in the middle plate cylinder and platen cylinder. The plate cylinder is placed below. Generally, each unit has 1 plate cylinder and 1 platen cylinder . In order to increase the printing pressure, some are equipped with 2 impression cylinders;

③ Ink feeding part: there are direct ink feeding which immerses the printing plate cylinder in the ink tank and indirect ink feeding which transfers the ink to the printing plate cylinder by the ink discharge roller immersed in the ink tank. Inkjet method

④ Drying part: it uses the hot air flow heated by electricity or steam, and some uses infrared or far infrared lamps to dry the printed products;

⑤ Receiving part: single sheets of roto printing machine are piled up in piles, and roll paper is to cut or fold the paper tape and pile up or rewind into a paper roll.

 

 

 

2.What are the types of roto printing machines?

① roto printing machines are divided into sheet paper and web rotogravure presses according to the paper used.

② The number of colors printed by the unit in one operation is divided into single color, four color, five color, six color, etc. There are also single-sided printing and double-sided printing.Overprinting with three primary colors of ink can print products with colors matching the original; in order to express the dark and dark parts of the screen, sometimes black, gray or other color overprints are added, called "four-color version", "five-color version" ...Spot colors are sometimes used in order to achieve the effect of pure ink color, concise and crisp.

 

 

 

3.What is the working principle of roto printing machine?

The text image of the roto printing machine is recessed, that is to say, the blank part of the rotogravure is on the same plane (layout), and the graphic part is located below the blank part, and the original image is expressed by the recessed layout of different depths Talk about the level, such a printing plate is called rotogravure.

The roto printing machine adopts the method of direct printing by circular pressure. The printing plate is directly made on the plate cylinder, and then the ink is immersed or sprayed to produce ink. There is no ink leveling mechanism. Due to the thick ink layer, fast drying ink with strong volatility is required, and a drying device is required.

The printing that reproduces the image with gravure is called gravure printing. The dark tone level on the original is the corresponding printed part on the rotogravure, and the depth of its low concave is large; otherwise, the brightest layer on the original is the corresponding printed part on the rotogravure, its low The depth of the depression is shallow. Therefore, the printed part of the intaglio plate expresses the depth of the printed image according to the difference of the ink contained in the depth of the depression.

图片1 

The graphic indentation on the printing plate of the roto printing machine changes with the density of the original color. Therefore, rotogravure printing is a conventional printing method that only has a thickness of an ink layer that can be used to indicate color density. The thickness is different to reflect the shadow of the ink. The thickness of the ink layer of the printed matter can reach 1-50 μm, so the density varies widely, the layer is rich, and the color is dense. In addition, the printing quality is stable, and the ink colors of different batches of printing are uniform.

图片2

The main feature of the roto printing machine is that the graphics and text on the printing plate are concave, and the blank part is convex, which is exactly the opposite of the layout structure of the relief printing machine. When the machine is printing monochrome, the printing plate is first immersed in the ink tank and rolled, and the entire printing plate surface is coated with ink layer. Then, the ink layer belonging to the blank part on the surface of the printing plate is scraped off, the convex part forms a blank, and the concave part is filled with ink. The machine transfers the ink in the recessed part to the printed matter by the action of pressure to obtain the printed matter.

 

 

4.What are the precautions for using roto printing machine?

① Before starting the machine, make sure that the drying cabinet exhaust and workshop ventilation are normal.

② During operation, do not put your hand into the running part of the machine, especially the clamping roller.

③ During operation adjustment during shutdown, the shutdown button should be locked.

④ When checking the machine, the main power switch on the main control cabinet must be turned off.

⑤ When doing electrical inspection, turn off the main power.

⑥ When feeding and cleaning on the hot roller in the drying oven, the heat source must be turned off first.

 

5.What are the common faults of roto printing machines? (With exclusion method)

① The phenomenon that the blocking ink dries in the holes of the printing plate, or the holes of the printing plate are filled with paper wool and paper powder, is called blocking. The methods of elimination are: increase the content of solvent in the ink, reduce the speed of ink drying, and use paper with high surface strength for printing.

② Periodic ink color changes appear on printed products with uneven ink density. The elimination methods are: correct the roundness of the plate cylinder, adjust the angle and pressure of the doctor blade, or replace with a new doctor blade.

③ Spots appear on the solid part of the ink overflowing the printed matter. The methods of elimination are: adding hard ink to increase the viscosity of the ink. Adjust the angle of the squeegee blade of the roto printing machine, increase the printing speed, and replace the deep mesh printing plate with a shallow mesh printing plate.

④ Blotting and blushing The printed images are graded and blurred, and burrs appear on the edges of the text. The elimination methods include: removing the static electricity on the surface of the substrate, adding polar solvent to the ink, appropriately increasing the printing pressure, adjusting the position of the squeegee, etc.

⑤ There are traces of the doctor blade on the scratched print. The elimination methods are: printing with clean ink without foreign matter mixing, adjusting the viscosity, drying property and adhesion of the ink. Use a high-quality doctor blade to adjust the angle between the doctor blade and the printing plate.

 


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