Print Pad Mounting Tips

What kind of pad is chosen according to the specific situation, but in the same state, there is an optimal state of its choice. Let's analyze this optimal situation below.

After the liner is installed, it cannot be allowed to slide forward and backward under the blanket. If you slide, it is likely to cause the deformation of the print. How can it not slide relative to each other? As shown in Fig. 2.5, the outside of the pad is in contact with the blanket, and the inside is in contact with the roller, so both of these contact surfaces will generate frictional forces that impede the movement of the pad. When this friction is insufficient, the pad may slide relatively. Therefore, in order not to slide relative to one another, it is necessary to create sufficient friction. As mentioned earlier, there are two ways to increase friction:

1 Let the blanket tightly and evenly enclose the surface of the drum, ie generate enough friction.

2 to make the contact surface has the greatest friction coefficient:

a. The surface of the blanket should have the largest possible roughness (under the premise of ensuring accuracy);

b. The surface of the liner should have as large a roughness as possible;

c. The surface of the blanket cylinder should have the maximum roughness (under the premise of ensuring accuracy).

The first way to achieve this is to increase the tension of the blanket so that it creates a greater pressure in the contact surface; the key to achieving the second article is the choice of materials. From the actual situation, the material of the blanket and the roller is determined, especially the roller can not be replaced under normal circumstances, the blanket due to different manufacturers, the surface characteristics will be different. What the user can select is the roughness of the pad surface. From the perspective of increasing the coefficient of friction, the rougher the surface of the gasket is, the better. There are two reasons for this requirement:

1 From the contact surface point of view, the friction coefficient of the liner and the blanket contact is much greater than the friction coefficient of the liner and the cylinder, that is, the possibility that the liner slides relative to the cylinder surface. To eliminate this, The only possibility is to increase the friction coefficient.

2 From the inside of the liner, because the liner is generally laminated by several layers, the contact surface is not allowed to slide relative to each other. The frictional force between them that hinders their relative sliding must be greater than the frictional force generated by the two external contact surfaces (and blanket, and cylinder body). As a result, the rougher the pad surface, the less likely it is to slip relative to one another, and the smaller the number of layers in the pad, the less likely it is to slip.

In summary, the principle of selecting the liner is:

1 The friction coefficient is as large as possible, ie, the surface is as rough as possible;

2 The number of layers of the liner should be as small as possible;

3 The liner surface should be as flat as possible.

The last point is required by the printing process, otherwise the transfer of the imprint will be affected. From this principle, we will analyze the selection methods of three kinds of pads:

Soft liners: Soft liners are generally made of wool cloth, so the friction coefficient on the surface is absolutely guaranteed. When the pressure is insufficient, it can be adjusted by adding a small amount of paper. Overall, the number of layers is small.

Neutral liners: Neutral liners are generally made of rubber and paper. The friction coefficient on the surface of the tape is relatively large. The key issue is the choice of paper. The papers commonly used by printing manufacturers include: coated paper, newsprint paper, offset paper, cardboard, and kraft paper. Because of its small flexibility, paper jams are inconvenient to use. Coated paper surface is relatively smooth, so it should not be selected. Alternatives are offset paper, newsprint and kraft paper. These three types of paper surface can produce a large coefficient of friction, but from the perspective of the least number of layers, the use of kraft paper is slightly better. Regardless of the type of paper chosen, Article 3 of the above principle must be absolutely guaranteed.

The installation method of the gasket is generally to place it on the surface of the roller so that it can be evenly and evenly contacted, and some devices are equipped with a device that clamps the gasket. This device provides convenience for the installation of the gasket. If the blanket is not tight enough, it will cause the paper to wrinkle forwards or backwards.

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