A web intaglio printing machine basically consisting of printing cylinders arranged in a satellite arrangement, ie, a gravure printing machine provided with gravure cylinders of various colors around a large common impression cylinder.
After the unwinding of the machine sheet by the feeding section, the printing roller enters the printing device through the transfer roller, and the six-color overprinting can be completed continuously. It is also possible to complete the one-side monochrome printing on the other side by the reverse printing device. After printing, rewind by the receiving department.
The printing device printing device mainly includes a roller member, a printing pressure adjusting device, a register error adjusting device, and a clutch pressure mechanism.
(1) Roller parts. Several color set plate cylinders are arranged around the impression cylinder.
Due to the different print sizes for each color group, the diameter of the plate cylinder is also different. Therefore, the center distance between the plate cylinder and the impression cylinder should be adjusted. In general, this is achieved by changing the high and low positions and the left and right positions of the plate cylinder.
(2) Adjustment of printing roller height and printing pressure.
1 adjustment of the height of the plate cylinder. When the diameter of the plate cylinder changes, the position of the plate cylinder should be adjusted first, and then the printing pressure should be adjusted.
2 adjustment of printing pressure. First, the clutch press mechanism is used to adjust the plate cylinder to be in the combined pressure state, and then the adjustment screws at the two ends of the plate cylinder are rotated to move the plate cylinder until an ideal and even printing pressure is obtained in the axial direction of the plate cylinder. The plate cylinder shaft is mounted in a sliding bearing, the position of the sliding bearing is fixed, and the plate cylinder can be adjusted along its axial direction. After adjustment, tighten the fastening screws to prevent the axial position of the plate cylinder during operation.
3 longitudinal registration error adjustment device. When the lateral register error is adjusted, the longitudinal register error can be adjusted. The longitudinal register error is adjusted by changing the circumferential position of the plate cylinder.
The double-side printing device is to expand the scope of use of the machine, and a double-side printing device can be set in the first color printing unit to achieve the single-side multi-color or one-side monochrome and the other side multi-color printing process requirements.
Ventilation and Drying Devices The ventilation and drying devices are one of the important components of the satellite gravure printing machine. The drying device consists of two parts, the inter-unit drying device and the post-press drying device. Since the space between satellite gravure printing press units is very short, it is not suitable to use a drying unit that occupies a large area, so a far-infrared dryer with a compact structure is generally used. Due to the large thermal deformation of the plastic film, special attention should be paid to properly controlling the drying temperature. Ventilation devices are generally used in conjunction with drying devices. A fan supplies the required wind source and blows the air through the ventilation nozzle to the printing surface to promote the solidification of the printed ink layer.
After the unwinding of the machine sheet by the feeding section, the printing roller enters the printing device through the transfer roller, and the six-color overprinting can be completed continuously. It is also possible to complete the one-side monochrome printing on the other side by the reverse printing device. After printing, rewind by the receiving department.
The printing device printing device mainly includes a roller member, a printing pressure adjusting device, a register error adjusting device, and a clutch pressure mechanism.
(1) Roller parts. Several color set plate cylinders are arranged around the impression cylinder.
Due to the different print sizes for each color group, the diameter of the plate cylinder is also different. Therefore, the center distance between the plate cylinder and the impression cylinder should be adjusted. In general, this is achieved by changing the high and low positions and the left and right positions of the plate cylinder.
(2) Adjustment of printing roller height and printing pressure.
1 adjustment of the height of the plate cylinder. When the diameter of the plate cylinder changes, the position of the plate cylinder should be adjusted first, and then the printing pressure should be adjusted.
2 adjustment of printing pressure. First, the clutch press mechanism is used to adjust the plate cylinder to be in the combined pressure state, and then the adjustment screws at the two ends of the plate cylinder are rotated to move the plate cylinder until an ideal and even printing pressure is obtained in the axial direction of the plate cylinder. The plate cylinder shaft is mounted in a sliding bearing, the position of the sliding bearing is fixed, and the plate cylinder can be adjusted along its axial direction. After adjustment, tighten the fastening screws to prevent the axial position of the plate cylinder during operation.
3 longitudinal registration error adjustment device. When the lateral register error is adjusted, the longitudinal register error can be adjusted. The longitudinal register error is adjusted by changing the circumferential position of the plate cylinder.
The double-side printing device is to expand the scope of use of the machine, and a double-side printing device can be set in the first color printing unit to achieve the single-side multi-color or one-side monochrome and the other side multi-color printing process requirements.
Ventilation and Drying Devices The ventilation and drying devices are one of the important components of the satellite gravure printing machine. The drying device consists of two parts, the inter-unit drying device and the post-press drying device. Since the space between satellite gravure printing press units is very short, it is not suitable to use a drying unit that occupies a large area, so a far-infrared dryer with a compact structure is generally used. Due to the large thermal deformation of the plastic film, special attention should be paid to properly controlling the drying temperature. Ventilation devices are generally used in conjunction with drying devices. A fan supplies the required wind source and blows the air through the ventilation nozzle to the printing surface to promote the solidification of the printed ink layer.
Geneva Watch Series Co., Ltd. , http://www.nsdigitalwatch.com