Color Rotogravure Printing Machine, SBY850A

Specifications

Processed MaterialsBOPP : 18-100μmCPP : 20-100μmPET : 12-100μmNYLON : 15-100μmPE : 35-100μmCellophane: 18-60μm Printing width: 400-850mm (model 850) Mechanical speed: (Max.) 200m/min (⌀150mm standard printing plate cylinder ) Printing speed: (Max.) 160-180m/min (⌀150mm standard printing plate cylinder ) Printing plate cylinder diameter: ⌀120- ⌀300mm Guide roller width: 900mm Unwinding roller diameter: Max. 600mm Rewinding roller diameter: Max. 600mm Paper core diameter: (Inner) ⌀76mm, (outer) ⌀96mm Unwinding tension: Max. 50N/m Unwinding traction tension: 0-25kg (frequency control)

Rewinding tension: Max 40N/m Rewinding traction tension: 0-25kg (frequency control) Printing registration accuracy: vertical registration ±0.1mm (automatic control) Printing pressure: 235kg Blade movement: ±5mm Drying method: Electric heating Power consumption for drying: 27kW per color Fan cooling: 0.75kW Main drive motor: 11kW (frequency motor) Power supply: 380V±10%, 50Hz, three-phase and four-wire Installed power: 185kW Operation power: 110kW Air supply: 0.8MPa dry compressed air Dimensions (Length x Width x Height): 15500×3000×3100mm Computer: Kesai 2000FV Total machine weight: 18500kg

Main Parts
Unwinding
Installation of material unwinding shaft on the rolling bearing device to minimize mechanical resistance and achieve minimal tension variation.
Automatic tension control with magnetic powder for two unwinding shafts, ensuring stable tension during roller changes.
High-precision processing of the film printing machine’s internal rotating frame to guarantee overall installation accuracy.
Pneumatic expanding unwinding shaft for quick and accurate replacement with precise centering.
During high-speed and non-stop roller changes, a pre-drive system is used to achieve optimal material feeding speed and automatic cutting, hence reducing material waste.
Film Feeding Tension (Infeed and Outfeed)
Rigid and flexible rollers are combined to ensure segmented tension distribution.
Ultra-low damping tension dancer roller to absorb tension fluctuations and ensure stable printing tension.
Precise tension setting through sophisticated pressure reducing valve.
Synchronous belt transmission for more accurate power transmission.
Printing
Heavy-duty blade structure to minimize streaking during high-speed printing. Air pressure control reduces workload, and three-point adjustment enables optimal blade angle.
Shaftless printing plate cylinder mounting with pneumatic clamping mechanism for improved plate changing efficiency.
Upper and lower floating rollers driven by ball screw transmission, with minimal gap and high repeatability in positioning.
Linkage between printing roller and guide roller using screw transmission to avoid film stretching and ensure accurate color registration.
Quick lifting is enabled to lock the printing rubber roller during machine stoppage.
Computer color registration system for higher registration accuracy, improved yield, and reduced labor intensity for operators.
Drying
Air recycling to power heat source so as to save energy.
Multiple airflow paths for thorough drying, thus preventing bubble formation.
Automatic temperature control for each drying unit in a convenient and precise manner.
High airflow speed and volume to create a low-temperature, high-speed drying method.
Easily opened oven for easy and quick access.
Negative pressure design inside the oven to prevent hot air leakage.
External oven design to enhance airflow and ensure effective drying.
Extended drying section is adopted to prevent ink transfer and sticking issues.

Cooling
Simple structure to reduce resistance to film movement.
Cooling design to thoroughly cool the film and restore its original state for accurate registration.

Rewinding
Flexible installation of rewinding shaft on the rolling bearing support for smooth operation.
During high-speed and non-stop roller changes, a pre-drive system is used to achieve optimal material feeding angle and speed, and automatic cutting function reduces material waste.
Adjustable rewinding tension to prevent uneven material winding.
Pneumatic expanding rewinding shaft for quick and accurate replacement with precise centering.

Machine Frame and Material Feeder
Cast wall panel with reduced internal stress for high stability.
Smooth layout of guide rollers for smooth film transportation.
Each guide roller is specially designed to eliminate lateral movement of materials during operation.
Use of stationary camera to address printing issues not visible to the naked eye and ensure accurate color registration.

Main Transmission
Utilization of vector frequency conversion to achieve low-speed, high-torque startup.
Accurate and smooth power transmission.

As a plastic bag film flexographic printing machine manufacturer based in China, we also provide label PS offset printing machine, automatic swing cylinder screen printing machine, label slitting machine, and much more.