Printing blanket manufacturing and species profile

Blanket for printing, which provides ink transfer during printing. The blanket has effective compressive properties, fast recovery force, strong adhesiveness, leaving no stickers, its slippery surface layer and fabric layer, the ink transfer Regardless of whether the outlet or the full version is more stable, the blanket transfer unit plays an important role in the printing process. With no blankets, printing cannot be completed.

A. Manufacture of Printing Blanket

Printing blankets are made from layers of specialized fabrics and synthetic rubber compounds. During manufacturing operations, fabrics and rubber are combined in a precisely controlled process using thermal and chemical energy. In addition, different compounds and structures give blankets. Different performance on the press.

The fabric layer of the printing blanket is different for each layer, and the fabric layer is composed of synthetic and natural fibers, and the strength and the resistance are different in each layer.

Printing blankets can be divided into two types:

Ordinary type

Fabric layer fabric layer

Adhesive layer adhesive layer

Surface rubber cushion

Surface rubber

Common type and air-cushion type comparison: When it comes to the air-cushion layer, the air-cushion layer is in the state of closed particles. It consists of synthetic elastomers and particles. The particles contain air. The compressibility between layers is determined by the air-cushion bubble and rubber compound. Blanket surface treatment is divided into three types, the first kind of casting: the use of vulcanized paper to form the surface of the polishing process. The second is grinding: The surface of the blanket is treated by a mechanical grinding process. The third is a chemical surface: The surface of the blanket must be treated with a specialized chemical structure. When it comes to the blanket layer, the printing blanket is composed of multiple layers of fabric. The number of layers refers to the number of layers of fibers contained in the rubber, generally divided into three layers and four layers. When it comes to blanket liners, blanket liners refer to the forces of mutual extrusion between the plate and the blanket, between the blanket and the blanket, and between the blanket and the printing or back roll. Printing machine liners are one of the most important parts of the printing process that need to be controlled effectively, and they are also crucial for obtaining print quality. All printed blanket liners should have certain characteristics. The proper liners will enhance the following characteristics: good print quality, the life of the blanket, and elasticity of the blanket. It can prevent stacking of ink, reduce plate wear, control the web well, reduce web breakage, and maintain a good overprint.

normal type

*Requires very accurate printing pressure

* Overfilling can cause printing problems

* The gap width is different in shutdown and operation

* Damage to the collision

Air cushion type

* Allows slight deviation in printing pressure

* Higher gasket flexibility

* The gap width is only slightly increased during shutdown and operation

* Collision rebound

The correct padding procedure is as follows: 1. Understand the cut length of the blanket and plate cylinder. 2. Measure the thickness of the blanket and its pads and plates and their pads. 3. Leave excess liner to compensate for the blanket installation and the thickness of the honing and filing. [All blankets will be 0.001"-.002"/0.03mm-0.05mm thick when installed. 4. Record the compression pressure. 5. Use a pad gauge to determine the height of the blanket to determine the compression pressure. 6. Adjust the pad to suit the printing conditions and understand the variable factors of the press for best results. In addition pad thickness measurement is also very important.

Blanket thickness can be measured on the press or off-machine, A. Off-machine measurement: Use a cady gauge thickness gauge to measure at four points determined by the ISO standard. B. Measurement on a Press: Three points on the roller were measured using Cobra Mike. There are several different types of blanket locking systems on the press: such as T-line bars, double-wrap bars, single-wrap bars, etc. that lock the blanket.

The proper installation procedure for the blanket is: 1. The printer is in a standby safe state, and when the plate has been installed, place the leading end or the collet end of the blanket in the winding rod or the locking system rod. 2. Insert and secure the liner at the leading end or the collet end of the blanket if necessary. 3. Turn off the printer. 4. Press the jog switch on the press and slowly rotate the roll to unwind the blanket and liner. 5. Put the printer in a safe, standby condition and place the end of the blanket in the winding rod or locking system rod.

The procedure for tightening the blanket is as follows: 1. Correctly install the blanket, tighten the blanket and fasten it with the spanner according to the predetermined settings. 2. When the printing press is in the standby printing state, the blanket roller is rotated several times and is still tightened in this state. 3. Make the pressure roller 〝 disconnect the print cartridge and tighten the blanket again. 4. When the printer first stops, tighten the blanket again. 5. The blanket now has proper tension and the blanket tension can only be adjusted in the event of a malfunction.

Finally, choose a blanket cleaner to briefly describe. The selection of cleaning agents needs to be taken into consideration for safety, flammability, relevant regulatory requirements and cleaning effectiveness. Strong cleaning agents have a good cleaning effect but can cause swelling of the blanket and elimination of the plasticizer in the blanket. The flexible cleaning agent takes a longer time and more effort to clean, but does not damage the surface of the blanket. In addition, the drying speed and the choice of solvents specifically designed for cleaning the surface of the blanket are the right way.

B. Overview of printed blanket types

There are many types of printing blankets, which are divided into the following types by air-cushion blankets. The following is only for reference:

1. Fully air-cushioned rubber blanket: Suitable for high-speed rotation, newspaper and high-speed leaf-leaf machines. Resilience is best. It has the best flex resistance and long service life. The surface is finely ground and has a compensating effect on poor quality paper, which improves the printing quality.

2. Air-cushion eraser: Consider the performance of the full version and outlets. The surface is a mixture layer, easy to clean, long-term use, the surface is not easy to leave imprints.

3. Three-in-one rubber blanket: One layer of splicing layer can be integrated to withstand the strongest in India. In the middle cushion layer, unlike ordinary blankets, it is easy to have bubbles and make the product easy to lose its thickness due to printing pressure. Increase the frequency of replacing liners. The bottom is waterproof and anti-solvent, it will not be uneven due to water absorption, resulting in uneven pressure. The blanket surface is specially treated with charcoal. It is resistant to large and small size, and never produces paper marks due to long printing.

4. General grade air-cushion blankets: best suited for non-coated paper printing and board printing. Surface grinding particle size of 6u ~ 8u, the best paper for local papermaking poor printing.

5. Traditional blankets: economical and practical commercial printing blankets. The surface is oil-resistant, so even if you use regular solvents such as gasoline to clean it for a long period of time, it will not be easy to cause photochemical glazes or rubber stickiness.

6.UV special rubber blanket: Anti-UV resin component is added to the rubber blanket mixture, it can resist UV ultraviolet rays, and the rubber is not easy to powder. Fast recovery, no paper cuts due to size printing.

7. Partially coated rubber blanket: special binding layer, used for local cutting applications. At the interface between the cutting layer and the non-cutting layer, the hardness can be cut resistant, the carrying capacity is even, and the glazing effect is improved. After cutting, tear the edges without burrs and smooth the coating.

8. Metal Printing 2 PSC Blanket: Blanket developed specifically for two-piece metal printing. Pre-coated self-adhesive. Gum homogeneous without bubbles. Make printing pressure more even.

9. Friction-resistant blanket: The surface rubber mixture contains high-hardness carbon molecules, which greatly improves the friction resistance. Applicable to the printed material of the uneven surface. The rubber surface is not easy to wear and prolong the use of time.

10. Special cups for paper cups: No underlying canvas layer, moderate hardness, making the ink transfer more complete. When double-sided adhesive tapes are used, (even with low-cost double-sided tapes), the adhesiveness is greatly improved, and it does not slip off, which can save expensive double-sided tapes.

11. UV self-adhesive blanket: then the best adhesive viscosity to prevent damage to tear angle. The rubber surface contains UV-resistive UV resin for extended life in UV printing.

12. Report machine self-adhesive blanket: report printing machine has been used for a long time the gray blanket. The hardness is softer and the foam adhesive is used. To prevent plastic softening during storage, pay attention to humidity and temperature.

13.Dunlop report machine self-adhesive blanket: high viscosity adhesive, plastic deformation, degumming. Removing the blanket does not leave any residue that is difficult to remove. Good solvent resistance. Can be used for UV inks.

14. A variety of aluminum strip blankets.

There are various types of printing presses in the domestic printing industry, but mainly Japanese and European-based printing machines, as well as printing machines manufactured in Taiwan, the United States, Eastern Europe, and other countries. As long as these presses are lithographic presses, they all rely on the transfer of blankets to complete the printing process. The quality of the blankets also affects the pros and cons of printing quality. It can be seen that blankets play a very important role in the printing process. Role. On the other hand, there are many domestic agents for various kinds of blankets, but the main sources of supply are Japan, Europe and the United States. The choice of prices and quality is also diversified, and the specification, suitability, adjustment, maintenance, and cleaning of the blankets are also diversified. , please refer to the original factory specifications as the basis for your purchase, in order to pursue a good and beautiful print quality, please take care of your blanket on the printing press.