Rotary screen printing is a printing method that uses the scraper to make the color paste in the circular screen printed on the fabric under the pressure. Licheng Flat Screen Printer Factory ( https://www.hotairstenter.com/product/flat-screen-printing-machine.html ) will come to analyze this aspect for you.

1. Open round screen printing mechanism

Open-type rotary screen printing machine is usually composed of four parts: cloth feeding device, printing head, drying device and cloth falling device. At present, open-type rotary screen printing machines usually have eight types of open-type rotary screen printing machines such as eight-color, twelve-color, sixteen-color and twenty-four-color. There are two main types of printing machine: 640mm and 904mm. Among them, most of the 640mm flower-returning open screen printing machines. The open rotary screen printing machine has the advantages of simple operation, low labor intensity and high output, and is suitable for printing various fabrics. At the same time, it is suitable for printing various kinds of small batch fabrics.

(1) Cloth feeding device There are two types of cloth feeding device for open-type rotary screen printing machine: cloth car feeding and cloth roll feeding. When the cloth is rolled into the cloth, the swinging cloth guide roller can be pressed against the cloth roll, and the cloth is guided into the printing device by the rotation of the cloth guide roller. When the fabric is fed, the fabric is printed with the rubber track running forward. This crawler is coated with a thin layer of thermoplastic resin on the surface of the rubber roller, so that the fabric can be pasted smoothly. An infrared radiation heater is installed next to the rubber roller to heat the resin on the track. Thermoplastic resin coating can process 200,000 to 1 million meters of fabric at a time. If you find that the viscosity is not good, you can reapply a layer.

(2) Printing device The rotary screen printing device includes a rotary screen, a scraper, and a pulp feeding device.

1. The rotary screen is the flower version of the printing machine. Made of nickel metal, also known as nickel mesh, with hexagonal mesh. The ends of the rotary screen are fixed with bulkheads to prevent the deformation of the rotary screen during printing, which affects the accuracy of the flower and can withstand the pressure of the color paste and the scraper during printing. In order to improve the elasticity of the rotary screen and reduce the pressure, the rotary screen should be installed away from the center line of the support roller, generally about 16mm. Each rotary screen base has a reading device, which can show the pressure of the scraper in all directions.

2. The scraper of the Open Type Rotary Screen Printing Machine ( https://www.hotairstenter.com/product/ ) is installed on the scraper holder on the center line of the rotary screen. The scraper holder is equipped with both scraper and slurry feed tube. The squeegee is made of chromium, molybdenum, vanadium, and steel alloys. It has the characteristics of small friction coefficient and adjustable angle. When printing, the blade of the scraper is tangent to the inner circle of the round net. The scraper mainly applies pressure to the color paste, and the compound action of scraping is auxiliary.

The blade pressure and position of the open-type rotary screen printing machine can be adjusted to suit the printing of fabrics of various patterns and thick and thin color pastes.