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Web Offset Printing Press – 4 High tower

news-paper-printing-machine-four-high-tower

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Machine Details

4 high tower is ideal for printing daily newspapers, periodicals, posters, books and circular printing with variety in colours and pagination and capable of printing 4 colour on either side of the web (4+4)

Introduction and Standard Features

4 – HI Tower Standard Features

  • Screw-type swing-down ink fountain with overrides for ink fountain roller.
  • Dynamically-balanced hard chrome plated solid plate and blanket cylinders.
  • On the nose, slit or spring-type plate lock-up system.
  • Manual side register system for both plate cylinders, on the run.
  • Electro-mechanical web-break detector.
  • Safety guards.
  • Centralized oil pressure lubrication for drive gears.
  • Provision for printing 4 colours on both sides of one web, or 2 colours on both sides of two webs, or single colour
  • Heavy-duty timer belt drive for 4 stack units.
  • On the run manual adjustment for registration of 4 colours on each side of web.
  • Variable-speed motorized dampening
Particulars 508 mm (20″) 533 mm (20.98″) 546mm (21.5″) 560mm (22″) 578mm (22.75″)
Printing speed 16000 – 36000 CPH 16000 – 36000 CPH 16000 – 36000 CPH 16000 – 36000 CPH 16000 – 36000 CPH
Plate Width 889 mm (35″) 889 mm (35″) 889 mm (35″) 889 mm (35″) 889 mm (35″)
Plate Length (Unbent) (Slit type) 539mm 564mm 577mm 591mm 609mm
Plate Thickness 0.30mm 0.30mm 0.30mm 0.30mm 0.30mm
Blanket Length (‘T’ Bar Type including bars) 556mm 581mm 594mm 608mm 626mm
Blanket Length (Narrow-gap including bars) 580mm 605mm 618mm 632mm 650mm
Blanket Width 889mm 889mm 889mm 889mm
Blanket Thickness (including packing) 1.65+0.45 1.65+0.45 1.65+0.45 1.65+0.45 1.65+0.45
Paper Width 700-889mm 700-889mm 700-889mm 700-889mm 700-889mm
Reel Diameter (Max) 1070mm (42″) 1070mm (42″) 1070mm (42″) 1070mm (42″) 1070mm (42″)
Printing Length (Max)’T’ Bar Type Blanket 482mm 507mm 520mm 534mm 552mm
Printing Length (Max) Narrow-gap Blanket 490mm 515mm 528mms 542mm 560mm
Paper gsm (uncoated) 38-80gsm 38-80gsm 38-80gsm 38-80gsm 38-80gsm

Dampening System

Cloth Dampening :-

Comprising one form roller, a chrome-plated oscillating drum, a transfer roller and a motor-driven fountain roller, which can be regulated independently of press speed for precise control, continuous-feed dampening system is reliable and easy to use. Provision has been made to connect to a dampener solution circulation system.

Brush Dampening (option) :-

Brush-Dampening

As an option Prakash offers motorized register system, wherein, an operator can adjust registration laterally and circumferentially from a remote desk.

This system offers greater control over the press in comparison to manual system and less manpower requirement. With motorized system, press comes with enclosure doors.

Spray Dampening (option) :-

Spray-Dampening

Spray Dampening System is provided in place of Film or Brushiest
dampening system. It increase efficiency and print quality, reduced start-up-waste, and savings in water and ink. Short payback makes the spray dampening system a necessary accessory for news paper presses.
The system has patented valves allowing a higher spraying cycle
frequency, delivery of precise water volumes, and uniform dampening of the plate cylinder.

Registration System

Manual registration :-

It is the most basic and inexpensive method for registration control and comes as a standard accessory. Lateral and circumferential register control is given on machine itself with easy to use attributes.

Motorized registration system (option) :-

motorized-register-system

As an option Prakash offers motorized register system, wherein, an operator can adjust registration laterally and circumferentially from a remote desk.
This system offers greater control over the press in comparison to manual system and less manpower requirement. With motorized system, press comes with enclosure doors.

Auto registration system (option) :-

auto-registration-system

Prakash offers automatic registration control system with a proven technology. It is a close loop system equipped with intelligent camera that continuously monitors and controls any deviation in registration. It comes with an easy to use touch screen user interface. The major advantage of this system is that it leads to huge saving by reducing wastage considerably which takes place during start up of the press.

Inking System

The inking system consists of a swing-down ink fountain which allows easy cleaning. 24 keys/ lever across the width of the ink fountain roller control the ink feed. The ink override control mechanism on the ink fountain roller ensures quick distribution of the ink all along the surface of the roller during printing runs and also easy cleaning of the ink fountain.

The gear-driven roller train (Comprising of copper-plated vibrator rollers, ink transfer and ink form rubber roller, ink feed and ink film on the plate cylinder or plate. Lever-style ink fountain is supplied as an option in Prakash presses.

On / Off controls

Manual controls:-

Manual on/off control is given on the machine itself for regulating ink, water, and impression.

Pneumatic Controls (option):-

motorized-register-system

Prakash offers highly reliable pneumatic controls for its presses, whereby, an operator can actuate controls for ink, water, and impression from remote desk. This type of control gives operator greater control over the press and it also helps in reducing paper wastage.

Drive System

Shafted:-

In this system a single drive shaft goes from the folder to the length of the press, driving each printing unit. In this arrangement high capacity motors are installed on the folder, which powers the entire press

Shaftless (option):-

The shaftless drive option provides excellent control over web tension from reelstand to folder through electronically synchronized AC motors. Which brings optimum control of the web position at all times. Subsequent benefits in press running are:

  • Easy synchronization of printing units to a folder
  • Optimum access throughout the press
  • Faster, easier plate changer for regional editions
  • Reliable of AC motor drives

Drive-system

Enhancements

Integrated RollStand

rollstand

where you can see and judge yourself Integrated roll stand offers state-of-the-art vibration free design, wherein tower load is uniformly distributed over roll stand for smooth running. Tension control is provided to reduce print waste; un-altered drive line height allows this machine to be installed in existing press line; Multi level platform makes the work easier.

Integrated Roll stand has many advantages:-

  • Space saving of around 43%.
  • Better print registration because of less web travel.
  • Easier webbing up of press.

This technology is available in all our machines as an option.

3 Ink Form Rollers

3inkforms

imagine1

10 rollers ink train with 3 ink forme rollers of differing diameters and 3 oscillators is ideal for newspaper and semi commercial printing.

3 ink Forme rollers has many advantages:-

  • Maximizes print contrast and solid density.
  • Minimizes dot gain and ghosting.
  • Provides sharp dots and perfect dot reproduction.

This technology is available in all our 30,000 and above speed machines as an option.

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