Analysis; Offset phenomenon of offset printing machine

One of the problems with the non-printing of West Chang'e is the stenciling. Outside the printing process, the oil or resin under the printing plate or blanket can be partially transferred to the name of the paper and then separated from the name of the paper. If the ink peeling force is less than the appearance of the paper, the ink layer will Peeling off the paper with small fibers, rubber, paint and other particles, so that the papermakers can be awkward to break the mane vulcanization scene, whether it can occur when significant paper stripping.

First, the impact of pulling the scene on the printing

Gradually disobeying the picture will defeat the local infection of Tuwu and affect the quality of printed products. On a round surface, the position of the stripped particles on the paper surface is due to the transfer of ink to produce a dense mottled spot; on the other side, the stripped particles are adhered to the plate through the transfer of the blanket, following the rotation of the plate and The fountain solution is wetted by contact. In the process of interfacing with the ink, the ink was squeezed out, so that the ink-printing staff did not ink up, resulting in a large number of erythema on the surface of the printed product. The peeled-off small particles are not invented and will deposit on the surface of the blanket and the printing plate as the printing retreats, making the printing plate wear, and increasing the number of cleanings of the blanket. Some small particles may even be transferred to ink tanks and sinks, making printing impossible.

Second, the analysis of the causes of the production and maturation

In the imprinting period, there is a very complicated mix of ink, paper, and blanket. The ink's own viscosity will produce a kind of adhesion on the surface of the paper when they are separated. The blanket is also non-viscous, and a total of the sample will adhere to the division. The interaction between ink, paper and blanket also produces a stripping tension.

If the feet are not on the basis of style, it will produce a pull hair, affect the quality of printing, and increase the frequency of washing the cloth when it is stopped.

Third, the impact of the speed of pulling hair

The complexities of ink, paper, and blankets in the embossing process make the appearance of missing papers not weak at all times, but they still pull the hairs. The speed of pulling the dark paper is not only affected by the printing speed. Depending on the viscosity of the ink, the thickness of the ink layer, the printing pressure, the warmth, etc.

1. Take the closed solution of printing speed

Pulling speed is based on the fact that the force between the three-dimensional body of the carcass is inversely proportional to the speed of the total disengagement, that is, the greater the printing speed, the greater the separation force. Recalling the source of the ink, as the printing speed is increased to a certain level, the total force of ink production and death is greater than the combined force of the paper surface. The speed is equal to the pulling speed.

2. Take the closing radius R of the solution

When the printing speed and other conditions are fixed, the smaller the radius of the drum is, the longer the absolute deceleration is, and the greater the peeling force between the ink layer blanket and the paper spot, the lesser the paper will fall off. The test chart is dark, and the paper's hair loss speed is based on the round-to-back ratio of the drum radius.

3. Relationship with ink fixability

The lapping speed of the paper lamination increases with the ink viscosity η and the tack value. The greater the adhesion of the ink, the longer the pulling speed. In addition, temperature error inks will have no effect, and affect the push speed. The degree of warmth is reduced, viscosity stickiness of oil sticks decreases, and the speed of brushing is reduced.

4. Closed solution with ink layer thickness

When the ink layer is very thick, the blanket cylinder simply interacts with the paper point. Because of the long amount of ink, the stripping force is small, but as the ink layer grows, the speed of the brushing greatly falls. When redemption increases to a certain level, the trend decreases and tends to be neglected.

Fourth, hold the paper to relax

1. The difference between the control of fire and printing when the offset printing is in balance, and the condition of the dirty version is high, so that the nominal paper quality of the printing plate can be extended and moistened, and the oil resistance of the reduced paper hair can be achieved to increase the amount of ink.

2. Properly adjust the viscosity and viscosity of the inks used, and in the inks, participate in proper spreading and concentration agents to reduce the adhesive viscosity and viscosity outside the ink, thereby improving the adhesion of the ink to the wrong paper. Strictly control the temperature of the room and avoid warmth and shortness.

3. Whether or not the paper is misprinted before printing is compressed into air pressure, the pressure is high, and the local paper and paper dust are attached to the blanket, and the paper is used to increase the interest of the paper. When synchronic, paper fibers shrink before the end of the contraction, the pressure on the use of the paper structure will lose more tightly, and make the printability of the loss of improvement.

4. When the paper is powdered off and the brushing is relatively large, it can be printed on the outer surface of the paper with a layer of top oil, which can be printed in black and white before it is wet. Because of the improved permeability of the paper's name, the special non-print gloss of printed products will lose significant progress.

5. When the time of receiving goods is not affected, the printing speed can be properly reduced, so that the printing speed is nearer than the speed of pushing hair. It is also necessary to adjust the printing pressure so that the embossing force between the blanket cylinder and the impression cylinder should be increased.

6. Dry and dirty blankets are often used to clean and keep the farm, and adhere to the good conditions. In the other, the blanket application is temporary, and the vulcanization is reflected and tenderized, especially non-winter weather is very hot, and the aged blanket can easily lead to sticky and defeat wool and powder. At this point, a layer of sulphur powder can be applied under the blanket. If we don't speak up, we only exchanged the blanket.

7. When it is impossible to adjust the victory, it is necessary to negotiate with the paper seekers and replace the paper with weak surface.

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