How to adjust the printing pressure

What is the ambition printing pressure? Let us know first print pressure effect in printing. Print pressure means the printer is printing ink is transferred to the desired pressure on the substrate. Suppose the pressure is inappropriate, which would have led graphic prints outlets is not full, is not clear, pale ink, graphic distortion level is unclear; nap together will attack the paper, graphic bigger or smaller, constitute overprint ban; also make printing anti-Indian rate, shortened life expectancy and machinery blanket. Print selection pressure ambition is minimal, even print pressure, so that the product does not expand outlets, printing clear, full, colorful graphics, level-order scheduling solution. Print pressure variation amount is tight after closing the pressure between the two rollers, that is to the extent of paper distortion after compression. The maximum deformation of offset printing, we generally put the blanket cylinder lining is called printing blanket compression pressure (volume contraction). When the base is determined from the back, the size of the print pressure is by nature and thickness of the blanket cylinder and printing cylinder liner o to choices. Since the blanket and pad is an elastomer, so the two rollers offset can not be achieved relatively conflict-free rollover. This is the key issue in the ambition offset pressure difficult to solve. The blanket cylinder and the impression cylinder in the combined pressure state, the radius and do not meet the radius of the front squeegee pressure is not equal, and its value is not greater than and less than the internal pressure of the blanket cylinder co-radius? Squeegee at maximum by A radial force at the point of minimum radius R1 and the force at point B is not the same as R2, blanket cylinder compression of the roll at C constitute the convex hull, the highest point of the radius of the convex hull C is R3? radius point B is ? squeegee radius size packing after three radii R1 drum base with a change from the pressure to determine ambition: lead wire with a feeler or flattening 0.5mm to precisely adjust two drum roll pillow space to conform to the provisions of data. Scheduling drum base is a way to get away from the pressure of ambition. Another way is to change the scheduling pressure roller bag lining thickness. Due to the blanket cylinder liner is an elastic body, and the thickness of the larger, it is generally on the blanket cylinder of the thickness of the pad to make changes to achieve aspirations of pressure to print. But this approach work in practice is to use only under the condition of last resort. Because of changes in the blanket cylinder liners, resulting in changes in the diameter of the drum, the drum having a diameter ranging from three, then the circumferential speed range, so that conflict and increase the sliding contact area, then resulting in graphics, network deformation , prints attack "thick stick." Seen from Figure 1, in the combined pressure state, the blanket on the blanket cylinder must be kneaded down the depth, at the rear of the roll to form a convex hull, indicating that the blanket cylinder in the combined pressure state, its diameter is not reduced and is increasing? This increased activity in partial seizures combined pressure drum roll, the active effects to make blanket spread out? In order to adhere to the three cylinders of equal diameter, no conflict and plain blanket cylinder machine shall be specified in the instructions bag liner pad, not blindly increase? Usually less liner thickness of 0.5 ~ 0.7mm. Liner plates above the roller pillow 0.1mm, blanket roll pillow higher than 0.3mm, when combined pressure, Al? B1 of the convex hull of a larger two episodes? Figure 2? B? A plate of pad above roll pillow 0.2 ~ 0.3mm, blanket below the roll pillow 0.05mm? at A2, B2 at the onset of the convex hull of the smaller, of course, less conflict and plain, less wear plates, no nap and "taping" shortcomings attack, high resistance to printing plates, outlets expand less, the level of understanding, extend life expectancy of the machine, the motor power consumption is also small. From the above discussion it shows that, in the pressure range to print ambition, which is to ensure accurate implementation skills print, the printer is working properly, get the basic high-quality printing products. Internship work should precisely adjust the pitch of the drum base and squeegee lining thickness, and according to the paper, printing and working conditions, adhere to the print pressure within the pressure range of ambition, which is the fundamental problem of offset printing One.