People often say, "seven by plate, three by printing", no doubt that the quality of the printing plate is very important for gravure printing. Among them, the processing accuracy of plate cylinder is very important to overprint.

Plate, cylinder, machining accuracy, accuracy, main index

A printing plate cylinder circular runout, coaxiality, roundness and taper taper etc.. Among them, the processing accuracy of the plate cylinder is the most direct and critical factor, and other factors can be expressed in different degrees as the circular runout of the plate cylinder.

Circular Runout

Error one: the length of the printed path is changed more than that of the assembly

A larger runout of a plate cylinder causes a change in the film tension and varies the length of the entire printing path to varying degrees.

Effect two: taper hole deviation is will affect the printing register

In addition, the plate cylinder is through the two ends of the taper hole (slot) to locate and transfer torque, and the taper hole at both ends of the plate cylinder are respectively connected with the two fixed rack Version (with key) cone closely with two solid cone and the key version of the plate cylinder shaft respectively play a role direction and radial positioning, and driven by a taper hole plate cylinder movement.

If a printing plate cylinder at both ends of the taper hole deviation, makes solid cone and cone version cannot achieve close coordination, printing plate cylinder will affect the running accuracy, thus affecting the printing register.

Effect three: and the cone drum drum affect the smoothness of the concentricity

The other ends of the roller cone concentric plate and the plate cylinder degree has a direct impact on the smooth running of the plate cylinder. If a printing plate cylinder in installation (welding) when the cone cannot achieve good concentricity, will bring disadvantageous influence to the printing.

The deviation of the diameter of the plate cylinder causes the deviation of the registration

Generally used for OPP film, PET film printing, the printing plate cylinder diameter difference of 0.03mm, and for PE film printing, 0.05mm. If the printing cylinder diameter deviation is too bad, it will bring great difficulties to printing. So, in the processing of gravure cylinder, must strictly control the plate cylinder diameter error in size allowable deviation range, at the same time when the plate is installed version should be installed in strict accordance with the design version of order, otherwise it will not cause unnecessary register deviation.

The overprinting mark error affects the tracking accuracy of the system

The overprinting mark is the information source of the registration system, which records the data information of the registration (including horizontal registration and longitudinal alignment). In the printing process, the registration information is adjusted according to the change of the mark displacement. Therefore, the printing plate roller must ensure that the location of the overprint mark is accurate. If the error range is beyond the range of adjustment, it will affect the tracking accuracy of the system, and can not achieve the purpose of accurate overprint.

The cleanliness of the plate cylinder will affect the installation schedule

When the plate is installed, must ensure that the plate at both ends of the drum and the cone plate fixing head cleaning, not adhesion of inks and other impurities, otherwise it will affect the progress of the installation. After the version is finished, apply the hand test to check whether the plate cylinder is flexible or not. Before printing, the indexing plate or the radial runout meter can be used to detect whether there is a circle beating in the printing plate cylinder, so as to adjust the printing quality in a timely manner.

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