First, what is inverted hair

When printing solids, lines, or text, burrs are produced at the edges of the text. This is often referred to as inverted wool. Tip the burr toward the bite, and tip the burr toward the drag. It is consistent in the direction of the printing plate, blanket and printing, otherwise it may be crowded phenomenon, it may also be a double shadow phenomenon.

2. Influencing factors of puzzle books printing manufacturer

Inverted hair is produced when the following three factors are present at the same time:

1, the plate drum and rubber drum are not properly lined, so that the radius of the plate drum is not equal to the radius of the rubber drum, and the difference is large.

2, the surface of the paper has more paper, silt, sand, etc. fall off on the rubber cloth.

3, plate plate metal substrate is not hard enough.

The above three factors are not related to the impression cylinder.

3. Fault analysis and solution of puzzle books printing manufacturer

1, pour hair: the production of pour hair, in the case of the above three factors, when the R printing > R rubber plate surface linear speed is greater than the linear speed of the rubber sheet surface, the two produce sliding friction in the combined pressure, the two produce friction in the combined pressure, so that the ink on the plate and the rubber sheet are squeezed in the opposite direction to each other. Because R printing > R rubber 'fast, the ink on its surface elongates in the direction of the trailing tip; The linear speed of the rubber blanket surface is slow, and the ink on its surface is elongated in the direction of the bite.

The elongated ink stains on the printing plate are removed due to the grease removal action of the water roller and the water bucket potion and the ink receiving action of the ink roller. Although elongated ink stains are constantly produced, they are constantly removed. Therefore, the lengthening of ink on the printing plate is instantaneous, so it does not become the source of backward. The elongated ink stains on the rubber blanket cannot all be transferred to the paper. Due to the adhesive effect of ink imprinting, more paper debris accumulates in the imprinting place than elsewhere. These shedding materials are mixed with ink marks to become oily deposits. When sliding friction is generated through the plate and the rubber blanket imprint, it slides and accumulates on the rubber blanket in the direction of the force generated by the plate. As the oily deposits on the rubber cloth continue to increase and thicken in the direction of the imprinting, the printing plate sand in contact with the area is worn and damaged. It is also eroded by oil, gradually feels lipophilic, and finally produces burr phenomenon, and burrs will become longer and longer. This is the reason why the burr part of the plate shines when the hair is inverted.

Treatment method: Reduce the plate liner, increase the number of removed liners in the rubber cloth, and appropriately increase the center distance between the rubber drum and the impression cylinder. If the liner number of the rubber cloth meets the standard data, the center distance between the plate drum and the rubber drum should be reduced after the plate is removed from the liner.

2, down hair: when R printing > R rubber, under the three factors that produce down hair, it will produce down hair. Its impression elongates in the opposite direction and the inverted hair, and the generation principle is the same as the inverted hair.

Treatment: Reduce the liner in the rubber cloth, if the plate liner is lower than the standard data, you can increase the liner in the plate, at the same time, reduce the center distance between the impression cylinder and the rubber cylinder. If the plate liner thickness meets the standard data, the center distance between the three rollers needs to be reduced at the same time.

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