How to choose unit type narrow width flexographic

2022-08-21
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How to choose and buy a unit type narrow width flexographic printing machine (II)

because flexographic printing machines are good at comprehensive processing capacity, many devices can be added to the machine to complete special functions. Common options and configurations are: - non-stop paper receiving unit. When the paper roll is changed frequently to avoid printing thick paper, the non-stop paper receiving device can be selected, which can realize continuous operation, so as to reduce the working hours delayed due to frequent paper roll replacement and the paper waste caused by frequent shutdown. When the paper receiving mode of printed matter is rewinding mode, after using the non-stop paper receiving, it is also necessary to install the non-stop winding unit. The non-stop paper receiving unit is usually 60 Inch unwinding diameter, or 72 inch unwinding diameter can be selected. There are two ways to connect paper: lap joint and butt joint. Lap joint is used for printing thin paper, and butt joint must be selected for printing thick paper. 6-inch and 12 inch inflatable cores are commonly used. The non-stop paper receiving unit can usually be equipped with coil break detection, coil lifting device, coil flattening device, 12 "mandrel conversion device and electric paper storage device

-- corona treatment device. When printing plastic film or aluminum foil, corona treatment device needs to be selected to enhance the inking ability of the substrate surface. There are three kinds of special for plastic film, aluminum foil and plastic film and aluminum foil, and there are two-sided corona treatment and one-sided corona treatment

-- red ash dust removal device. When the surface of the substrate carries ash or paper powder and wool, the paper ash dust removal device can be selected to remove the dust and wool on the front or both sides of the paper by eliminating static electricity and dust collection device. There are two options: single-sided paper dust removal and double-sided paper dust removal

-- manual de curling device. When it is necessary to flatten the paper that is excessively curled due to its proximity to the cylinder core, it is usually possible to add a de curling device before the deviation correction device. To reduce the warpage of products after cutting

-- turnover device. When it is necessary to print on both sides of the substrate, the turnover device should be selected. The turnover device of flexographic printing machine can usually be installed on any printing unit as required

-- ink pump. According to experience, when more than 0.5 gallons of ink needs to be added within 1 hour during the printing process, it is necessary to choose to install the ink pump. It is best to use with closed doctor blade

-- closed doctor blade. If the closed doctor blade is selected, an ink pump needs to be installed

-- stripping/compounding device. When it is necessary to print on the back (glued surface) of self-adhesive face paper, the stripping/compounding device needs to be selected, and it needs to be used in conjunction with the turnover device to complete the printing on both sides of the same paper. The working principle is: when feeding paper, the face paper is downward, and the stripping device separates the bottom paper from the face paper. At this time, the gelatinization of the face paper is facing upward, and enters the printing unit. After printing the gelatinized surface, the composite device presses and combines the face paper and the bottom paper, and then turns the front face of the face paper upward through the turning device, and then prints the front face of the face paper

-- when the silk printing unit needs to print patterns with a certain thickness of scratch cover ink, Braille or frosted effect, it should choose the silk printing unit. For convenience, a fast moving track system should be selected, which can quickly move the silk printing unit to any flexographic unit. Since the rotary silk printing unit matched with the flexographic printing machine uses a nickel cylindrical printing plate, it also needs to be equipped with special plate making equipment and plate washing equipment. In addition, in order to improve the drying speed of silk printing ink in order to synchronize with the flexographic printing machine, most users use UV ink. Therefore, it is also necessary to equip the silk printing unit with a UV drying system for certain shrinkage

-- automatic registration system, which is divided into two parts: printing to printing and printing to die cutting. It can track the color code during the printing process to adjust the longitudinal automatic registration of the printing part or die cutting part. On some models, automatic registration is a standard configuration. Automatic registration system cannot be installed on models that cannot adjust 360 ° registration. In particular, in foreign countries, due to the stability of flexographic printing press and the high price of automatic registration system, users rarely use it

-- UV device, which can be used for UV glazing and UV ink printing. When it is used for UV glazing, it is installed on the last group of printing units, and is equipped with a hot air drying system or an infrared drying system at the same time. When it is not used for UV glazing, it can also be used for printing ordinary ink; UV devices can also be installed on all printing units, which are specially used for UV ink printing; The drying system for printing ordinary ink can also be installed at the same time to assemble a UV and ordinary ink printer

-- laminating device, which is used to compound cold pressing pre coating film on the substrate, and needs to be used in conjunction with the waste collection rewinding shaft, which is used as the winding shaft of the composite film

-- pneumatic slitting knife, optional when the substrate needs to be cut longitudinally. Installed on the die cutting station, the number of slitting knives can be determined according to needs. If the 16 inch model can generally be equipped with 10 knives at most, the pneumatic slitting knife is generally press cutting. If there are requirements for the smoothness of the edge after slitting, it is recommended to choose a shear slitting knife or a razor slitting knife

-- paper receiving platform. When the paper receiving after printing and die cutting does not adopt the rewinding method, the paper receiving platform should be selected, and the length of the paper receiving platform can be selected as required. Generally, the paper receiving table is equipped with a batch counter, which has the function of batch counting; And the speed of the conveyor belt can be adjusted

-- fan folding driver. When it is necessary to fan the printed substrate, it is necessary to add a fan folding driver

-- die cutting tool lifting device, installed above the die cutting station, is used to lift the die cutting roller. If the width of the selected model is wide, it should be selected because the die-cutting tool is more reasonable. Some models should also be equipped with two sets of lifting devices because the distance between the first and last two sets of die cutting stations is long

-- image detection system, which is used to observe the printing quality during the printing process. Camera lenses with strobe lights synchronized with printing are generally installed in front of the die cutting station behind the printing unit, and the functions of different types of image detection systems are slightly different. It mainly includes: whether there is horizontal automatic scanning function; Whether there is image segmentation function of the display screen; Whether there is image memory function; Whether remote control operation is available; Resolution of lens; Multiple of display image, etc

-- the die-cutting pressure gauge and bridge plate can make the plastic formula design and recycling more flexible when adjusting the die-cutting pressure, so as to read the pressure value through the pressure gauge to achieve accurate adjustment. Protect the tool, so as to extend the service life of the rotary die-cutting tool

-- paper break detection device, which can be installed at the paper feeding position. When the paper breaks, it can realize automatic shutdown. And it can be installed at the waste discharge position, and it will stop automatically when the waste edge is broken. In order to avoid paper waste and machine failure caused by failure to shut down in time, it should be selected when printing fragile materials

-- vacuum waste suction device. When equipped with non-stop paper receiving, it is recommended to select a vacuum waste suction device to realize the automatic discharge of die-cutting waste edges. If the substrate is a thick paper, you should also choose the crushing system, first smash the waste edge, and then discharge it. Since the vacuum pump is noisy and has a roar, it must be installed in isolation from the printing press

-- bronzing unit, which can be installed on any printing unit, but will affect the printing speed; Since it is a continuous operation mode, anodized cannot skip steps, so anodized wastes a lot

-- when one machine is used to print extremely thick and thin materials, it should be equipped with another set of 3. Imprinting cylinders for hard and brittle materials. Note that the two sets of rollers cannot be mixed, and the order of each set of rollers from the first unit cannot be disturbed

-- plate loading machine. Although it is not a part of the printing machine, it is essential. The previous version has differences in size and function. There are roughly three types. One is the simplest one, which controls the accuracy of sticking plates by visual inspection; The second is a magnifying lens with cross hairs on the edge of the observation plate; Third, it is equipped with a camera lens and a display screen, which can observe the position of the cross hairs through the display screen, so as to control the accuracy of plate pasting

although these configurations are common, don't be complacent. The principle of configuration selection should be sufficient. Choose carefully according to the process of the product to be processed. Some of them are temporarily unavailable and can be matched or not. It is recommended not to match them first, and then match them when they are used in the future

in addition, some tools and materials should be purchased with the machine. Such as: plate cylinder, die-cutting knife roller, grain roller, doctor blade, knife wrapping sponge, double-sided adhesive tape for plate pasting, etc. However, the determination of the technical parameters of the plate cylinder, die-cutting knife roller and embossing roller all depend on the specific product conditions required by the users

IV. brand selection: at present, several brands of flexographic printing entering the Chinese market can be selected. The key points of selection are: the manufacturer should have a certain number of years of history in manufacturing flexographic printing machines and rich experience; The high market share indicates that the machine is recognized by users; There are many models or styles to choose from. Although users only need one model of machine products, many models prove the design strength of the manufacturer and the maturity of the model; It has strong strength and a certain production scale, so that it can still provide maintenance parts after several years; The equipment output is large, and the product interchangeability is good; All parts of the machine have part numbers for future maintenance and replacement of accessories

v. selecting agents: when choosing brands, we should also pay attention to selecting agents. Because flexographic printing is relatively unfamiliar to most users. Moreover, compared with other printing methods, flexographic printing requires much more technical support. Therefore, when the machine is bought back, the agent is required to help start the machine. A good agent should be responsible for the complete technical training. The so-called integrity means not only teaching the operator how to press the button, but also carrying out systematic teaching training; A good agent should have a deep understanding of flexographic printing, understand both the machine and the process, can not only give the best equipment configuration scheme according to the needs of users, but also help users solve the technical problems in the process of machine operation; The agent should also be able to provide all flexographic printing consumables and the tools and materials supporting flexographic printing. Thus, it can solve all the needs of users from equipment to technology and consumables

although a large number of offset printing machines and gravure printing machines can be completed on the flexographic printing camera, this does not mean that a flexographic printing machine can be equipped into a universal model in the high-end market. It's unrealistic and uneconomical to try to be able to do anything on a machine. Therefore, as mentioned at the beginning of this article, it is very important to determine the product direction when selecting and matching machines. Only by determining what to print, can we easily solve the problem of what to match with machines. Flexographic printing is not omnipotent, so don't try to equip the flexographic printing machine as omnipotent

source: China's printing market

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