OFFSET solutions

Offset printing, also known as lithography, is a widespread technique in sheetfed presses. With webfed machines, it provides new opportunities starting with high quality packaging.

Perfect color matching, great image details : precision is a core strength of Offset printing.
Furthermore, such precision is guaranteed whatever the substrate thanks to the perfect contact between the blanket and the web even with recycled cartonboards.

Initially offering the best cost effectiveness on largest volumes, offset presses maintain this competitive edge now including lower quantities. Fastest and cheapest pre-press are part of the equation.

As opposed to flexography or rotogravure, the offset technique allows fine-tuning operations for a perfect ink control, thus granting the possibility to balance potential imperfections during the pre-press stage.

Main Applications

Komori-Chambon expertise

  • Automation

     

    The Komori-Chambon presses embed the high-end Komori offset automation in the web field.

  • Full control

     

    All servo-driven units are connected for distant monitoring and settings.

  • Mastering cardboard 

     

    The unrivaled web tension control ensures an outstanding printing quality.

  • Waste reduction

     

    Automated settings lower the start-up waste and allow flying changeovers.

Production flow insights

  • Printing plates are a key part in the offset process.
  • One plate is needed for each color unit
  • The average price being around 10 US dollars, a plate is by far the cheapest printing form
  • A plate is prepared according to the image file in around 1 minute via a CTP platesetter
  • Intelligent inking train (ink tank filling + ink film adjustment)
  • Easy and fast plate and blanket mount on cylinders (tightened or glued)
  • Instant 0 setting
  • Inker warm up and pre-inking in hidden time
  • High-end Komori PQC
  • Quick Color register
  • Pre-inking for reduced start-up waste
  • Safety device in case of web wrap-up around cylinders
  • Optional optical quality control (closed loop)
  • Most common technology is UV type, with intermediate color units dryers + a final dryer
  • Some markets exclude UV inks because of potential migration of ink photoinitiators. Therefore EB (Electron beam) curing can be selected
  • Flexo units can be added on the line either to apply varnishes or to print the inside box panels
  • Rotogravure units may be fitted in order to add metallic inks, holograms or large color patches
  • All designed and integrated by Komori-Chambon
  • Coatings, touch varnish, hot coil, cold foil…
  • Pre-setting of next job from CTP while the press is running
  • Automatic ink train washer
  • Fast plate change for new design / cylinder change if new layout
  • Cylinders shift without breaking the web

Printing units versions

Cassette type

Our cassette web offset presses are especially designed to ensure constant high quality production for any run length. Printing cassettes technology is best for productions with a limited number of repeats (like liquid packaging, ice cream cups…).

Sleeve type

The Sleeve Technology is perfect when you handle a versatile production and and flying changeovers. This system also provides a lower cost solution for a wide range of printing repeats. Your production flexibility is increased even more by choosing either a tightened or glued blanket.

Gallery

Available configurations

ROLL TO ROLL by-pass

The press includes a rewinder right after the printing units.
The converting stage will be proceeded offline

For more flexibility, the line can include a rotary die-cutter and a by-pass to transfer the web to the rewinder

ROLL TO ROLL direct

The press includes a rewinder right after the printing units.
The converting stage will be proceeded offline

ROLL TO BLANKS

The best configuration to take the maximum profit of your production line.

The inline rotary die-cutter, placed right after the printing stage, can be followed by a high speed delivery solution.

The carton roll is transformed into ready-to-ship blanks within 7 seconds.

ROLL TO SHEETS

The printed web can be converted in sheets thanks to a sheeter.

The sheets can be converted offline with a flat bed die cutter.

Specifications

  • Substrate type
    Paper, cartonboard, complex
  • Substrate characteristics
    Up to 600 gsm / 34 points
  • Max production speed
    375 m/mn standard
  • Max printing width
    Up to 1220 mm
  • Repeat
    1100 mm max

Usual options

  • Reverse printing
  • Flexo unit
  • Rotogravure unit
  • Dry Offset process
  • Closed loop optical inspection
  • Auto ink tank filler
  • Other upon request