Discussion on rotary screen printing and flat screen printing technology
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Screen printing is a very old printing method, which uses the mesh of the screen part of the screen to transfer the ink to form a pattern, which has been passed down to the present because of its simplicity and practicality. With the advancement of science and technology, the emergence of various new materials, new technologies and new equipment has accelerated the pace of screen printing technology. In the past few decades, a circular screen plate that has been integrally formed by metal nickel plating through a special process has been used. The automatic ink supply system transfers the ink from the rotary screen to the substrate by a built-in doctor blade, and follows the screen printing method. The advantages and features, and high-speed continuous operation, make up for the low speed and low efficiency of flat screen printing, is the embodiment of the latest technology of screen printing, and is also the best choice for upgrading the flat screen.
Flat screen printing and rotary screen printing, as the way of screen printing, have the characteristics and advantages of screen printing, mainly as follows:
First, the ink layer is thick and strong.
The thickness of the screen printed ink layer is generally up to 10 microns, particularly up to 20 microns, and the screen printing can reach 260 microns. The thickness of these ink layers is unachievable by other printing methods. The company logo, Braille and other products made with the characteristics of thick ink layer and strong stereoscopic effect have distinct characteristics.
Second, a wide range of ink types
Different types of inks such as oily, water-based, synthetic resin emulsion type, powder and other types of ink can be produced by screen, and the product is strong.
Third, low cost, simple production
The screen is easy to make, and the flat net and the round net can be reused, saving costs, and it is suitable for the long version and the short board. It is a good choice.
Since the rotary screen and the flat screen printing have the characteristics of screen printing, what is the difference between the flat screen printing and the rotary screen printing technology? What are the advantages of the rotary network?
First, stability
Since the flat screen is made of polyester mesh, the screen itself has a certain tension, and the screen is pressed by the scraper to make the ink form a pattern through the mesh. The process of pressing the blade will cause a certain deformation of the screen. Naturally, it will also cause deformation of the pattern.
The screen printing uses a nickel-plated metal mesh, and the mesh is composed of a stable hexagon. Due to the use of metal materials, the screen and the substrate adopt the roll-to-roll line contact, and the material itself has no tension, and the deformation phenomenon caused by the tension problem does not occur during the printing process, thereby effectively ensuring the printing quality of the pattern.
Second, high speed continuous operation
Because the flat screen printing is flat, the screen is lifted and lowered every time, and the scraper is stopped up and down. Therefore, the speed becomes a difficult problem for flat screen printing. Due to the change of the scraper up and down, the thickness of the ink layer will be uneven, which will affect the quality of the product.
The rotary screen printing uses a completely different operation mode from the flat screen. Its main features are high speed and stable printing. Through the built-in scraper and automatic ink supply system, the ink is transferred to the substrate during the continuous high-speed rotation of the rotary screen, without unnecessary pause time, continuous constant speed operation, speed up to 150 m / min (about 15,000 impressions per hour) ), the production efficiency has been multiplied.
Third, single machine, connection can be
Due to the limitation of speed, the printing mode of flat screen printing can not be produced online with other machines, and it is impossible to achieve multi-function.
The rotary screen printing can be run continuously at high speed by round and round printing. It is suitable for online production with offset printing, embossing, flexo printing, etc. For some special effects products that need to apply flat screen printing, only one die-cutting is needed now. Forming, shortening the process, saving time and labor costs, and taking advantage of various printing technologies through on-line production to achieve the best production capacity of the printing press.
If the customer does not need to produce on-line, it is only necessary to remove the rotary screen printing unit and install it on a separate platform to form a new rotary screen printing machine. The multi-function of one machine can play the practicality of the rotary screen printing machine.
As a kind of screen printing, rotary screen printing reflects new innovative technologies. In practical applications, it is an ideal choice for many printing companies to increase product added value and seize the high-end market. The use of rotary screen printing ink layer thick, strong hiding power and other characteristics, in the field of labeling, anti-counterfeiting and packaging printing applications are more and more extensive. It brings considerable economic benefits to customers, and is therefore the first choice for upgrading customers of flat screen printing customers.