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Páginas: 13 (3053 palabras)
Publicado: 10 de octubre de 2012
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International Paper RDC Workshop
Steve Biller The Ward Machinery Company Cockeysville, MD
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International Paper RDC Workshop
Objectives:
• Not here to sell you anything. • Here to provide information that can help you achieve your objective. • On-going process!
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International Paper RDC Workshop
Components of a Rotary Diecutter Anatomy of a Cutting Die
®Components of the RDC
for:
International Paper RDC Workshop
• • • •
Feed Section Flexo Section Transfer Section Diecut Section
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Rotary Die Cutters
13000 66” x 80” (1675 x 2030mm) 15000 66” x 113” (1675 x 2870mm) 16000 66” x 125” (1675 x 3170mm) Maximum Speed 170 bpm
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Componants of the RDC • Feed Section
• Flexo Section • Transfer Section • Diecut Section
®Feed Section
Upper Feed Roll Lower Feed Roll
Side guide Feed Gate Vacuum Feed Table Assembly Vacuum Duct & Cross-tie Cross-
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Feed Section
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Side View
Feed Gates
Front View
The Feed Gates align the front edge of the sheets as they are waiting to be fed into the machine. They are a major influence on registration and prevent early and double feeds.
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A blower on thedrive side of the Feed Section draws air through the front cross-tie, vacuum ducts, and in the top of the feed table. This holds the sheets tight against the table.
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Vacuum Table Components
Idler Pulley Lifting Shafts Lifting Bar & Wear Strips
Vacuum Box
Tensioner Pulley Tensioner Spring
Feed Belt Timing Pulley
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Upper & Lower Feed Rolls
Feed Nip
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A BUpper Feed Roll
The No-Crush™ Upper Feed Roll is a dual durometer roll. This means the urethane covering is two different hardness. A harder longer wearing outer layer (A) and a softer, pliable inner layer (B). This combination makes a long lasting roll that will not crush the board.
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Upper Feed Roll
The grooves in the roll allow the pliable inner layer to expand (or displace) whenthe sheets pass through the nip. This prevents crushing of the board.
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Lower Feed Roll
The lower Feed Roll has a straight Knurl design. This design allow excellent grip and wear, while producing little to no paper dust.
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Componants of the RDC
• Feed Section
• Flexo Section
• Transfer Section • Diecut Section
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Print Section
Vacuum Transfer Anilox Roll BladeMetering System
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Dust Covers and Guarding Impression Cylinder Print Cylinder
Wipe Roll & Ink Pan
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Vacuum Plate Mounting
The Ward Vac-u-Mount™ plate mounting system uses vacuum to hold the special vacuum printing plate to the cylinder. No straps or tape is required.
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Vacuum Plate Mounting
Vacuum is drawn on the cylinder by a blower mounted on the drive side of themachine. Valves in the cylinder, below the lead edge mounting strip draw a vacuum through the screw thread-like groove in the cylinder.
Print Cylinder Blower Damper Valves
Exhaust
Blower Motor
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Hollow Journal
Chambered Blade System
Air Tube
Spring Upper Blade & Clamp Ink Chamber Lower Blade & Clamp Support Bar The End Dam is not shown in this view.
Support FrameCross-tie
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Chambered Blade System
Ink is pumped into a chamber created by the doctor blade support bar, the upper and lower blades and the anilox roll.
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(A)
Anilox Roll
Chambered Blade System
The Upper (or Doctor) blade (A) scrapes the ink from the surface of the anilox roll leaving ink only in the cells of the roll.
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Anilox Roll
Chambered Blade System
(B) The Lower(or Chamber) Blade (B) creates the bottom of the chamber and retains the ink.
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Wipe Roll System
Wipe Roll
Anilox Roll
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Ink is pumped into this trough. The wipe roll then works as a squeegee to remove ink from the surface of the anilox roll leaving ink in the anilox cells.
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Componants of the RDC
• Feed Section • Flexo Section
• Transfer Section
• Diecut Section
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