What are the shape of the dots, what are their characteristics, and why should they pay attention to the shape of dots?

A: The shape of traditional dot has square dots and round dots. Now more used is the chain point. Because of the different shapes, the perimeters of the same size are different. The round point has the largest perimeter, and thus the dot gain rate is the largest.
In the process from small to large, there are always sites that begin to overlap, as shown in Figure 2. In this part, because the overlap of the dots will cause a sudden increase in the density of the printed matter, thus destroying the continuity of the printed matter and causing the loss of certain levels of tone. For example, gradients can cause uneven transitions due to density jumps.
Of the above three types of dots, the square dots overlap at 50%, the circular dots overlap at about 70%, and the chain points are about 40% and 60%. In contrast, the image quality of the chain-shaped dot is better, because its overlap site avoids the midtones, and the overlap is divided into two, weakening the density jump. Because of this, if the image contrast is small and soft, such as a character image, a chain-shaped dot may be used; if the image contrast is large, a square or circular dot may be used.

Tapered Bearings

Tapered roller bearings refer to radial thrust rolling bearings with tapered rollers as rolling elements. There are two types: small cone angle and large cone angle. The small cone angle mainly bears the radial and axial combined load based on the radial load, and is often used in pairs, installed in reverse, the inner and outer seat rings can be installed separately, and the radial and axial clearance can be adjusted in installation and use; The large cone angle mainly bears the axial and radial combined load based on the axial load, and is generally not used alone to bear the pure axial load, and can be used to bear the pure radial load when it is used as a pair configuration (the end of the same name is relatively installed). The ability of a single row tapered roller bearing to withstand an axial load depends on the contact angle, i.e. the outer ring raceway angle, the greater the angle, the greater the axial load capacity. The most widely used tapered roller bearing is a single row tapered roller bearing. In the front wheel hub of the car, small double row tapered roller bearings are used. Four-row tapered roller bearings are used in heavy machines such as large cold and hot rolling mills

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