What Is The Difference Between Rotary Printing And Flexographic Printing?

Rotational printing and flexographic printing vary widely in their core principles, printing quality, cost-effectiveness, application areas and equipment characteristics. The specific analysis is as follows:
I. Core Principles and Process Differences
Rotation printing
How it works: Printing is accomplished by rolling the drum continuously. Paper (or other substrate) is continuously fed into the paper in the form of a drum, and images and text are transmitted by pressure between cylinders.
Type: Includes offset printing (e.g. newspaper printing) and gravure printing (e.g. packaging printing). The principle of offset printing is that oil and water cannot be mixed, whereas the gravure printing uses gravure grooves to store ink and scrape off excess ink.
Inking System: using long ink path design, through multiple cylinders to transfer ink, suitable for large area printing.
Flexographic Printing
How it works: letterpress printing, flexographic printing plates (such as resin plates) is a method of transferring ink through an a anilox rollers. Images and words on the plate are raised, and ink is evenly applied to the plate under pressure of an imprint roller. Ink transfer system: short ink path design only requires transfer roller, screen roller, plate roller roller and impression roller to achieve more accurate ink control.
Printing Plate Characteristics: soft, flexible, low shoreline hardness (25-60), excellent ink transfer performance, especially for alcohol-based inks.
ii. Print Quality Comparison
Rotation printing
Strengths: High printing accuracy (200 lines per inch), bright colors and clear layers make it ideal for high-quality, high-volume printing such as magazines and catalogs.
Weaknesses: Ink drying problems in gravure printing can lead to firmer shadows, while offset printing can lead to a lack of detail in highlights.
Flexographic Printing
Advantages: thick ink layers, high color saturation, suitable for packaging printing, remarkable effect. High quality resin plate and ceramic anilox rollers, printing accuracy up to 175 lines per inch, rich gradations.
Weaknesses: Notices increase significantly (16%-30%), highlights fade, solid shadows are likely. Changes in plate thickness can affect alignment accuracy. III. Cost-benefit analysis
Web Printing
Equipment costs: High initial investment, complex structure and high maintenance costs.
Production Efficiency: Fast printing (suitable for long-term use), low unit cost, suitable for orders of more than 1 million copies.
Flexibility: Change of print content requires replacement of plates and adjustment of cylinders, resulting in long setup times and difficulty in meeting the requirements of small batches and high varieties.
Flexographic Printing
Equipment costs: Investments are significantly lower than for monochrome offset printers, with only 30%-50% of a gravure press.
Production Efficiency: Fast printing (generally 1.5 -2 times faster than offset printers), double-sided, multicolored printing and inline reprocessing (e.g. varnish, embossing, die-cutting), shortening production cycles.
Flexibility: the plate making cycle is short, suitable for small and medium-sized orders, through digital plate changes technology, to improve plate making speed.
IV. INTRODUCTION INTRODUCTION Application and Material Compatibility
Web Printing
Main Applications: high volume paper printing materials, such as newspapers, magazines, catalogues, instructions, etc. Material Requirements: roll paper is generally required and paper has a certain thickness and strength. Special materials such as cardboard and plastic sheets are not suitable.
Flexographic Printing
Main uses: Packaging printing (such as corrugated boxes, plastic film, label, soft packaging), self-adhesive label, paper cups, paper bags, etc.
Material Compatibility: widely used in paper, cardboard, corrugated paper, film, aluminum foil, hose and other composites. It can even be printed on curved surfaces or three-dimensional substrates.
V. Equipment Features and operation maintenance.
Rotation printing
Complex structure: small size, the need for a precise tension system to maintain the flow of materials smooth, to minimize overprint deviation.
Operation and maintenance: high level of automation, but the need for specialized technical staff to operate and maintain, resulting in higher costs.
Flexographic Printing
Simple structure: short ink transfer path, fewer parts, simple structure, less processing materials.
Operation and maintenance: The anilox roller inking system eliminates complex ink mechanism, facilitates operation and maintenance, and provides rapid ink control.