Define the process parameters of flexo printing to

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Clarify the process parameters of flexo printing and improve the quality of flexo printing products

flexo printing has developed rapidly in China and has become one of the fastest-growing printing methods. Flexographic printing has unique printing process requirements. Understanding various factors affecting flexographic printing quality, clarifying flexographic printing process parameters and formulating reasonable process flow are the premise of doing a good job in flexographic printing

the main factors affecting the quality of flexo printing are: flexo printing machine, photosensitive resin flexo and plate making, prepress processing technology, printing materials (web paper), tape, ink, roller, etc

I. mechanical process requirements of flexo printing machine

next, we will talk about the process requirements of flexo printing machine in combination with narrow width flexo printing machine (unit type)

1. Tension control system ensures accurate overprint

2. Sensitive pressure and tension adjustment ensures the accurate setting of printing pressure

3. The plate roller, wrinkle roller, ink transfer roller and impression roller should have high radial runout accuracy

4. Efficient and fast drying system to ensure the overprint effect

5. According to the printing material and the number of plate lines, configure the appropriate corrugation roller

II. Photosensitive resin flexo and plate making

1 Determine the thickness of the plate used according to the specific printing materials and the structure of the printing machine

2. According to the characteristics of the printing pattern, consider the exposure tolerance of the plate, determine the plate model, and ensure the reproduction of fine points of the number of high lines (such as 2% points of 60 lines/inch image)

3. The wettability of printing plate surface ink should be uniform

4. Ensure the same depth of the convex part of the printing plate, and ensure a balanced wall angle and sharp edges and corners

5. Ensure the hardness of the printing plate and control the hardness tolerance range

prepress process directly affects the plate making and final printing tension testing machine. It is applicable to the stretching, peeling, deformation, tearing, heat sealing, bonding, puncture force, opening force, low-speed unwinding force and other performance testing brush effects of plastic film, composite materials, adhesives, adhesive tapes, self-adhesive, medical patches, protective films, release papers, backplane materials, rubber, paper fibers and other products. The following points should be noted:

1 High resolution image scanning equipment is the key to flexographic color separation and reproduction, which makes fine flexographic printing with high line number possible

2. Take full account of the obvious color increment in flexographic printing

3. Accurate point compensation is applied in prepress processing to ensure the expected printing effect

4. High quality negative film output, advanced plate making system to ensure the quality of plate making

The development and application of

i technology further improved the quality of swing angle flexo printing

III. process requirements for printing ink

1 The primary color with an accurate certain tone, so that the desired effect can be achieved after the overprint of the basic color and the mixed color

2. Set the ink characteristics (viscosity/surface tension) according to the characteristics of the substrate

3. The proportion of colorant (pigment) in the ink is high enough to achieve sufficient color intensity with less ink transfer

4. The appropriate amount of solvent in the ink will not make the photosensitive resin plate swell due to immersion, but also make the ink meet the requirements of firm adhesion and non fading

5. The drying speed of ink should be compatible with the printing speed

6. The dried ink can resist acid, alkali, water, ultraviolet and abrasion, and is not affected by alcohol and grease

IV. properties of printing materials

1 Good adaptability, only absorb an appropriate amount of ink at the predetermined position, without affecting its normal drying speed

2. It has a certain degree of smoothness, inking and suitable rheological properties, which is composed of smooth areas

3. It has sufficient surface strength to prevent fuzzing, and its shape and size are stable

4. There are no adhesive dust particles on the surface of the paper

v. selection of adhesive tape

the selection of adhesive tape should be based on the characteristics of printing patterns

1. Choose hard tape when printing on the spot

2. Choose neutral tape when the field and point coexist

3. Choose soft tape for dot printing

various factors affecting flexographic printing quality do not exist independently. The influence of other factors should be considered when determining process parameters, that is, only when various factors affecting flexographic printing quality are coordinated, can ideal prints be obtained. Finally, we should emphasize that we must not ignore the impact of the operator's own level on the printing quality

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