GRAVOR PRINTING TECHNOLOGY
Gravure printing, also known as gravure printing, is an advanced printing method widely used in the packaging industry.

How it works
Gravure printing is based on the principle of gravure printing, where images or writing are engraved into the metal surface of the printing cylinder. When the printing cylinder is dipped in ink, the ink fills these depressions. The squeegee removes the excess ink on the surface of the cylinder, leaving only ink in the depressions. When the printing cylinder contacts the printing material under high pressure, the ink from the depressions is transferred to the surface of the material, creating the print.

Advantages
Superior printing quality: This technology allows for the reproduction of images and text with high detail, especially continuous and smooth tones.

Fast printing speed: Modern gravure printers can achieve very high printing speeds, ideal for large-volume production.
Durability of the printing shaft: The printing shaft has a long life and can be reused many times without reducing the print quality. Long Vu Packaging Company has a policy of preserving the gravure printing shaft. Free for the first year of production, but the maintenance fee will be charged from the second year onwards.
Ability to print on many types of materials: This technology can be applied to many different types of materials such as paper, plastic, and thin metal.

Disadvantages
High initial cost: The production of printing shafts requires a large initial investment, so it is not suitable for small orders.
Large quantity requirements: To achieve production efficiency, it is often necessary to print large quantities, at least about 300kg.

Gravure printing technology system
The gravure printing system operates through two main stages:

Stage 1: Ink supply and ink wiping
Liquid ink is applied to the surface of the printing plate, where the ink will flow into the depressions of the printing element. A device called a squeegee will remove excess ink from the surface of the mold, leaving only ink in these depressions. This process ensures that only the ink in the printing elements is retained, helping to create sharp and precise images.

Stage 2: Ink transfer and fast ink drying technology
When printing, the ink in the depressions will be transferred to the surface of the material under high pressure, specifically the hot air created by the rotation of the printing system. The ink in the non-printing elements is wiped clean by the squeegee, leaving only the ink in the holes (printing elements). The ink from these holes will adhere to the surface of the material thanks to the high printing pressure. Because gravure printing ink has a low viscosity (about 0.1 Pa.s), after each printing unit, a drying unit is needed to dry the ink. This drying process helps the ink dry quickly, ensuring the print quality and durability of the product.

Gravure printing technology products
To reproduce the layers, the holes on the gravure printing cylinder can have the following forms:

Chemical etching method: The depth of the hole changes but the hole area remains the same.

Electronic engraving method: Both the depth and the area of ​​the hole change, allowing for very high quality image restoration.

Advantages

High restoration ability: Gravure printing has the ability to restore images with higher precision than typo and offset printing.
Durability of the printing cylinder: The printing cylinder is durable, if well preserved, it can be used for multiple reprints.
Fast printing speed: Modern gravure printing machines can achieve printing speeds of over 200 meters/minute.

Disadvantages
High cost: The cost of the printing cylinder is high, so this method requires printing large quantities (from 500,000 revolutions or more) to achieve production efficiency.