The roller center distance, is refers to the adjacent two roller center distance, it is in the two roller gear quarter circle radius the sum.
The printing plate cylinder and the cylinder is printed hard surface pressure is not easy, after the deformation of printing pressure is achieved. By rubber cloth the roller press press of the rubber lining cloth deformation of the elastic force. Therefore, roller printing process in, rubber cloth roller and other two roller contact place, and not a straight line, but a width is setting value of curve, usually in the production of rubber cloth maximum compressive deformation value is called printing pressure, in fact, the largest compression value (deformation value) is two phase pressure roller radius of the cylinder liner, the paper, the thickness of the two roller with actual of the difference of the center distance.
Printing the effects of stress is:
(1) keep the rough surface achieve full access to the printing paper, rubber cloth. And the printing plate surface are in rough pore shape, for the rough surface, must be in certain pressure effect, and achieve a deformation and other reliable, full contact, overcome the printing the roughness and roughness, so that the ink, wetting liquid and solid surface to each other, achieve efficient transfer of adsorption.
(2) overcome molecular attraction, enhance the ink absorption force, printing ink between the molecules have certain gravity, when ink absorption ability more than ink molecule room gravity. Ink began to fracture in the middle of the displaced, printing ink, but in adsorption, the shift of transfer surface contact distance must close, can generate adsorption effect. So, only under certain pressure effect, between molecules of gravity, to better adsorption and transfer printing ink.
(3) pressure osmosis. Ink mark to paper, with links to material to produce the penetrating phenomena, paper printing ink on paper penetration can be divided into: pressure penetration and free penetration two physical phenomenon.