Flexo printing technology
Flexo printing technology originated in the United States in the late 19th century. Over the years, this technology has been increasingly developed, allowing the printing of more complex, beautiful, and eye-catching images. Flexo printing is still very important in the packaging industry today. The popularity of bag packaging causes more and more packaging to switch from offset to flexo
Printing process overview
The printing material is a light-sensitive polymer. A layer of negative film is placed on the plate and then UV light is passed through it. Where light shines through, the polymer will harden. The remaining parts are still flexible and will be "washed out" in water or solvent and then cleaned.
The second way is to use a laser cutter to engrave directly onto the print.
The third way is to go through the molding process. The first step is to create a metal negative. This negative will be used to mold a primary casting. This mold will be used to stamp rubber or plastic compounds to create secondary prints. This is the print that will be used in the flexographic printing process
On the axis (mount the print on the shaft or put the print on the machine)
For each print color, a printout of that color must be made and mounted on an axis on the printer. For a complete image, the separated image on each axis must be correctly calibrated with the remaining axes. Mounting the correct plate on the shaft correctly is essential to print a quality product and minimize product defects. Therefore, the spooling should produce the same results for every print used. There were also several machines that made the shafting process more precise.
A flexographic product is created when the print is embossed on a surface that can be rubber, paper, or polymer. The printout is a stereoscopic negative of the design to be printed. Prints can be made by hand or with a digital cutter.
The simple structure of the flexographic printing machine
The ink will be rolled onto the print surface through the ink roller with a part immersed in the ink tray. The rollers directly roll the ink onto prints made of anilox or some similar material which helps them to hold and coat the ink at an even thickness. A scraper will scrape excess ink off the anilox shaft before coating the print. When the print roller comes into contact with the material to be printed, it leaves an image on it. After printing, the printed image will be passed through a drying chamber to dry the ink
Application of flexographic printing technology
Flexo's advantage over lithography is that it can use a variety of inks and a variety of media. Flexo printing products are extremely diverse. From carton boxes to soft packagings such as shopping bags, food packaging, milk cartons, and disposable cups... Some newspapers are now also switching from lithography to flexographic printing. Flexo inks also have a lower viscosity and are easier to dry, thereby speeding up production.
Flexo printing speed can be up to 750m/min with the most modern printers. For maximum efficiency, it is common to print large rolls and then shred them in cutters.
For more information, design consultation, and packaging printing needs, please contact:
Tam Thanh Industrial Joint Stock Company
PP factory: Ngoc Dong – Da Ton – Gia Lam – Hanoi
Complex factory: Hamlet Bai - Uy No - Co Loa - Dong Anh - Hanoi
Hotline: 0988 827 237 – 0904592386
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