Rotary screen printing is so named because it uses a cylindrical screen that rotates in a fixed position rather than a flat screen that is raised and lowered over the same print location. Rotary presses place the squeegee within the screen. These machines are designed for roll-to-roll (web) printing on flexible materials ranging from narrow web films to wide-format roll textiles.
In rotary printing, the web travels at a consistent speed between the screen and a steel or rubber impression roller immediately below the screen. (The impression roller serves the same function as the press bed on a flatbed press.) As the web passes through the rotary unit, the screen spins at a rate that identically matches the speed of substrate movement.
The squeegee on a rotary press is in a fixed position with its edge making contact with the inside surface of the screen precisely at the point where the screen, substrate, and impression roller come together (Figure 1). Ink is automatically fed into the center of the screen and collects in a wedge-shaped "well" formed by the leading side of the squeegee and the screen's interior surface. The motion of the screen causes this bead of ink to roll, which forces ink into stencil openings, essentially flooding the screen without requiring a floodbar. The squeegee then shears the ink as the stencil and substrate come into contact, allowing the ink to transfer cleanly to the material.
In short, rotary printing is a continuous, stepless image-transfer method. The geometry of the screen and the position of the squeegee within the screen combine to provide both the screen-flooding and image-transfer functions in a single smooth operation that repeats with every revolution of the screen.
Changzhou?Liangru?International?Trade?CO.,?LTD is an expert supplier for totary screens and spare parts for textile dyeing,printing and finishing machinery in China.We are located in Changzhou city,near Shanghai and with very convenient transportation.We are the main member of China Member of Commerce.We have promoted hundreds of products to our foreign customers.Now our sales volume is increasing every year because we always pay more attention to the quality of the products and offer the most competitive price to our every customer,this is why we are successful.Every customer is warmly welcome to send us your inquiry,we must give you the best service and best quality with most competitive price,we believe we will have good cooperation under our perfect service.