Network to expand its offset indeed have an adverse impact, then, how to control the expansion of dots? We know from the following aspects to talk about the specific operational measures.

    1.晒版master offset the exposure time

     Control exposure time, developing time and developer humidity, concentration ratio, is to reduce one of the ways to expand the network. Separation of the four-color film through晒版will be transferred to the network facsimile plates, the request to expand network as little as possible, 3% ~ 5% of outlets are not lost, 5% of the outlets do not expand, 95% -98% of the dots do not paste version, network firm, round particles are neat ideas, no white dots, the burr edge, rich layers Tone and clear. This requires an accurate version of the preparation of PS developer, according to the proportion specification formulation, exposure time gray-foot ladder,晒版Article signal to the data of control, printing plate, after drying out 5-10 times with the magnifying glass to check the ladder feet and signal loss paste version of article-level, network expansion.

     2. A reasonable choice packet liner materials and printing pressure

     Offset printing is a kind of indirect way necessary elastomer rubber roller between the plate dots Graphic Transfer to paper surface, the blanket and its lining are facsimile transfer packets between the media, there is no packet liner would be no printing pressure. Through the thickness of the offset press packet contrast adjustments, can get the best printing pressure, and enhance color printing products shades of uniformity and clarity of dots. Printing pressure is through the packet liner thickness and the roller center distance of two ways to regulate access to, the pressure should be based on printed materials with solid dots, graphic clarity, color and shading to the premise of affordable, and the volume of the smaller, the better to exert control network expansion deformation, accurate adjustment of printing pressure is critical. At work and used to accurately calculate the micrometer measuring rubber lining thickness of drum kits, adjusting the center distance between two rollers, in the network to expand the scope of the permit, the use of the smallest uniform printing pressure.

    3. Control the balance of ink dots to reduce the expansion of

     Control the balance of ink in order to improve the quality of printed products. Promote non-dirty version, paste version of the premise, the use of as little as possible the layout of water. Ink Offset Operator balance is also a measure of the technical level of standards, only to achieve a balance of ink on paper telescopic deformation of a small set of high accuracy, color, hue, hue in order to meet a number of proofs of the depth of consistent color printing, printing out the dots Granule yen is strong. Offset printing ink to avoid water big big墨层thickness outward expansion of the phenomenon of spreading of the dots, control 3% ~ 5% of the regional small bright dots are not transferred loss, 5% transferred between networks is not expanded, not scalable, dark tune regional 95% -97% of the dots and do not paste, ink control standards: Graphic solid dots clear, imprinted color hue accurate premise, the use of as little as possible of the ink.