Label Flexo Printing Machine

Label Flexo Printing Machine
Flexo label printing machine Characteristics: 1,The main motor adopts imported converter to govern to govern in a stepples way. 2,Feeding and discharging are controlled through magnetic powder brake and clutch(Japanese aut tension controller). 3,Unwinder systern is controlled by aoto-rectify...
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Product Details

Flexo label printing machine

Characteristics:
1,The main motor adopts imported converter to govern to govern in a stepples way.
2,Feeding and discharging are controlled through magnetic powder brake and clutch(Japanese aut tension controller).
3,Unwinder systern is controlled by aoto-rectify sensor.
4,Adopt ceramic mesh distributor roller,which is characterized by durability,wear resistance,and corrosion resistance.The doctors can be Used,which is more efficient for reducing the times for changing in order to increase the production efficiency.
5,The printing unit can register in 360 degrees.Each printing unit can indepen dently gear and loosen to have the units continue printing.
6,The printing units are equipped with a group of infrared dryers redpectively.
7,Each IR dryer device of printing unit can interchange of Uv dryer device.
8,The rooling devic is adopted clipping device qith air-expansion core shaft.
9,THe inking roller can aotomatically fall off at stoppage and transfer at low speed in order to keep the ink from being dry and solid.
10,The roll feeding, printing,polishing,aoto infrared drying,laminating and rolling can be processed in one processing.It is characterized by wide application,non-population of printing ink and fast drying,quick printing.So it is an ideal printing machine for the commercial bill to print high-Graded free adhesive trademark.

 Flexo label printing machine

printing speed

60m/min

Printing color

4-6 colors

Max web width

320mm

Max printing width

310mm

Max unwinding diameter

600mm

Max rewinding diameter

550mm

Printing circumference

175-320mm

Registering precision

±0.10mm

Overall dimensions

2000×1100×2100mm

Weight

1800Kg 

Flexography (often abbreviated to flexo) is a form of printing process which utilizes a flexible relief plate. It is essentially a modern version of letterpress which can be used for printing on almost any type of substrate, including plastic, metallic films, cellophane, and paper. It is widely used for printing on the non-porous substrates required for various types of food packaging (it is also well suited for printing large areas of solid color).

Process overview

1. Platemaking
The first method of plate development uses light-sensitive polymer. A film negative is placed over the plate,which is exposed to ultra-violet light. The polymer hardens where light passes through the film. The remaining polymer has the consistency of chewed gum. It is washed away in a tank of either water or solvent. Brushes scrub the plate to facilitate the "washout" process. The process can differ depending on whether solid sheets of photopolymer or liquid photopolymer are used, but the principle is still the same. The plate to be washed out is fixed in the orbital washout unit on a sticky base plate. The plate is washed out in a mixture of water and 1% dishwasher soap, at a temperature of approximately 40°C. The unit is equipped with a dual membrane filter. With this the environmental burdening is kept to an absolute minimum. The membrane unit separates photopolymer from the washout water. After addition of absorb gelatine for example, the photopolymer residue can be disposed of as standard solid waste together with household refuse. The recycled water is re-used without adding any detergent.

The second method used a computer-guided laser to etch the image onto the printing plate. Such a direct laser engraving process is called digital platemaking. Companies such as AV Flexologic, Polymount and Screen from The Netherlands are market leaders in manufacturing this type of equipment.

The third method is to go through a molding process. The first step is to create a metal plate out of the negative of our initial image through an exposition process (followed by an acid bath). This metal plate in relief is then used in the second step to create the mold that could be in bakelite board or even glass or plastic, through a first molding process.Once cooled, this master mold will press the rubber or plastic compound (under both controlled temperature and pressure) through a second molding process to create the printing plate.

2. Mounting

For every colour to be printed, a plate is made and eventually put on a cylinder which is placed in the printing press. To ensure an accurate picture is made, mounting marks are made on the flexographic plates. These mounting marks can be microdots (down to 0.3 mm) and/or mounting crosses. To make a complete picture, regardless of printing on flexible film or corrugated paper, the image transferred from each plate has to fit exactly in the images transferred from the other colors.Highly accurate and specific machinery is made for mounting these plates on the printing cylinders. One of the latest advances in this field is Fully Automatic Mounting Machine (FAMM), for which AV Flexologic won the FTA Technical Innovation Award in 2007.

3. Printing

A flexographic print is made by creating a positive mirrored master of the required image as a 3D relief in a rubber or polymer material. Flexographic plates can be created with analog and digital platemaking processes. The image areas are raised above the non image areas on the rubber or polymer plate. The ink is transferred from the ink roll which is partially immersed in the ink tank. Then it transfers to the anilox roll (or meter roll) whose texture holds a specific amount of ink since it is covered with thousands of small wells or cups that enable it to meter ink to the printing plate in a uniform thickness evenly and quickly (the number of cells per linear inch can vary according to the type of print job and the quality required).To avoid getting a final product with a smudgy or lumpy look, it must be ensured that the amount of ink on the printing plate is not excessive. This is achieved by using a metal scraper, called a doctor blade. The doctor blade removes excess ink from the anilox roller before inking the printing plate. The substrate is finally sandwiched between the plate and the impression cylinder to transfer the image.The sheet is then fed through a dryer, which allows the inks to dry before moving on.In the case a UV ink is used, the sheet does not have to be dried, but is dried from UV rays.

Operation

Operational overview

1. Fountain roller
The fountain roller transfers the ink that is located in the ink pan to the second roller, which is the anilox roller.

2. Anilox roller
This is what makes flexography unique. The anilox roller meters the predetermined ink that is transferred for uniform thickness. It has engraved cells that carry a certain capacity of inks that can only be seen with a microscope.

3. Plate cylinder
The plate cylinder holds the printing plate, which is soft flexible rubber. Sticky 2-way tape is used to mount the plate to the plate cylinder.

4. impression cylinder
The impression cylinder applies pressure to the plate cylinder, where the image is transferred to the substrate.

Flexographic printing inks
The nature and demands of the printing process and the application of the printed product determine the fundamental properties required of flexographic inks. Measuring the physical properties of inks and understanding how these are affected by the choice of ingredients is a large part of ink technology. Formulation of inks requires a detailed knowledge of the physical and chemical properties of the raw materials composing the inks, and how these ingredients affect or react with each other as well as with the environment. Flexographic printing inks are primarily formulated to remain compatible with the wide variety of substrates used in the process. Each formulation component individually fulfills a special function and the proportion and composition will vary according to the substrate.

There are five types of inks that can be used in flexography: solvent-based inks, water-based inks, electron beam (EB) curing inks, ultraviolet (UV) curing inks and two-part chemically-curing inks (usually based on polyurethane isocyanate reactions), although these are uncommon at the moment.Water based flexo inks with particle sizes below 5 µm may cause problems when deinking recycled paper.

Applications
Flexo has an advantage over lithography in that it can use a wider range of inks, water based rather than oil based inks,and is good at printing on a variety of different materials like plastic, foil, acetate film, brown paper, and other materials used in packaging. Typical products printed using flexography include brown corrugated boxes, flexible packaging including retail and shopping bags, food and hygiene bags and sacks, milk and beverage cartons, flexible plastics, self adhesive labels, disposable cups and containers, envelopes and wallpaper. A number of newspapers now eschew the more common offset lithography process in favour of flexo. Flexographic inks, like those used in gravure and unlike those used in lithography, generally have a low viscosity. This enables faster drying and, as a result, faster production, which results in lower costs.

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