The Printing plate forms a high-precision hollow cylinder. Which is not directly attached to the printing machine; instead, affixed to this sleeve,and installed into the machine. This enables "offline plate preparation", where changing the active part only requires replacing the sleeve in a few dozen seconds, greatly enhancing efficiency
Main advantages
Replacing the traditional integrated plate roller with a plate-fitting sleeve brings three major innovations:
* Efficiency revolution
The printer can pre-complete the plate loading on another set of plate-mounting sleeves while the machine is running. Once the work on the machine is finished, the old sleeve can be directly removed and replaced with a new one, compressing the changeover time from tens of minutes to just a few minutes or even tens of seconds.
* Flexible and adaptable
The inflatable core of the printing press is fixed. By replacing the plate-mounting sleeves with different wall thicknesses, the printing circumference can be adjusted from 130mm to 2000mm on the same machine, greatly expanding the equipment's capabilities.
* Quality improvement
High-quality sleeves feature a compressible buffer layer that absorbs vibrations during high-speed operation. This is crucial for printing delicate high-definition dot patterns, effectively reducing ink streaks and dot enlargement.
Common Classifications and Characteristics
Based on the material and function of the surface layer, it is mainly divided into the following two types
|
Category |
Features and Advantages |
Applicable scenarios |
|
Hard-surfaced sleeve |
The surface is hard, impact-resistant,and cut-resistant, and the price is relatively low |
Thick printing (1.7mm-7mm) is mainly used for printing corrugated cardboard, kraft paper bags, and other products that do not require high precision |
|
Soft/air cushion sleeve |
It features a compressible elastic surface layer, effectively absorbing vibrations and minimizing dot gain, ensuring high printing precision |
High-quality fine printing, such as labels, flexible packaging, barcodes, halftone images, etc |
Operating Principle
The installation of the plate-fitting sleeve requires the use of an air-expanding mandrel. During installation, compressed air (typically at a pressure of 0.3-0.5 MPa) is filled into the mandrel, and the gas escapes through surface pores, forming an "air cushion" between the mandrel and the inner wall of the sleeve. This causes the inner diameter of the sleeve to expand slightly, allowing it to be easily pushed in or pulled out. After the air source is cut off, the sleeve is firmly fixed to the mandrel
Product Detail Drawing
Key Points of Use and Maintenance
To ensure the accuracy and lifespan of the sleeve, routine maintenance is crucial:
*Installation specifications: Before assembly and disassembly, be sure to clean the mandrel and the inner wall of the sleeve. Use specialized tools to avoid violent impact. *After installation, check the radial runout, which should generally be controlled within ≤0.03mm.
*Daily storage: After cleaning, it should be stored vertically to avoid deformation due to pressure. The recommended storage environment is at a temperature of 15-25°C and a humidity of 40%-60%, and direct sunlight should be avoided.
*Service life: Under normal use and maintenance, the service life of the plate-mounted sleeve is typically 3-5 years or approximately 15 million revolutions
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