“MS Drum” Uncut High-Precision Drawn Aluminum Pipe for Photoconductor Drums

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For laser printers and copying machines

Picture of “MS Drum” Uncut High-Precision Drawn Aluminum Pipe for Photoconductor Drums

Photoconductive drums are said to be the heart of laser printers and copying machines. High-precision drawn aluminum pipes are the materials used in such drums. Through its own development, UACJ has succeeded in using precision extrusion and cold-drawing processes to achieve a mirror surface, eliminating the need for conventional machining and mirror surface processing.


  • Using the cold-drawing process to create an excellent surface and reduce surface-machining processes.
  • Achieves high dimensional precision (exterior and interior diameters, chatter pattern).
  • Organic solvents are unnecessary, allowing environmentally friendly water washing and eliminating the need for oil during production.
  • Automatic testers are used to test all products for dimensional accuracy and surface quality.
  • Ensuring stable product quality through consistent manufacturing process management spanning casting, extrusion, drawing and testing.


  • Photoconductive drum for laser printers and copying machines
Picture of Photoconductive drum products
Photoconductive drum products
Fig. Photoconductive drum

Product Characteristics

Superb dimensional precision and coated optical surface characteristics

Tolerance on outside diameter Approximately 1/5 of JIS
Chatter pattern*1 35 μm or less
Surface roughness*2 Ry ≦ 2 μm
  • *1 Assumed measurement at center, when tubes are supported at both ends and rotated
  • *2 Maximum height

Production Process

Comparison of conventional and new processes

Conventional process

Fig. Conventional process

New process

Fig. New process

Picture of Drum material production line
Drum material production line