Flexo Printer Slotter Machine: Technical Guide for Corrugated Converting

The flexo printer slotter is a key converting machine that prints graphics and cuts slots on corrugated board sheets. It is often used as a standalone unit or as the front section of a flexo folder gluer line.

What is a Flexo Printer Slotter?

A flexo printer slotter (also called printer slotter or flexo printer slotter die cutter) performs:

1. Flexographic printing on corrugated board

2. Slotting (cutting flap slots)

3. Scoring (creating fold lines)

4. Optional die cutting for special shapes

The output is printed, slotted sheets that are then folded and glued on a separate folder gluer — or the machine may include inline folding and gluing (becoming an FFG).

Machine Configurations:

Printer Slotter Only:

• Prints and slots sheets only

• Output goes to separate folder gluer

• Lower investment, more flexibility

• Common in small-to-medium factories

Printer Slotter + Folder Gluer (FFG):

• Integrated inline system

• Sheet enters, finished box exits

• Higher efficiency, less labor

• Standard for medium-to-large operations

Printer Slotter + Rotary Die Cutter:

• Adds die cutting capability for complex shapes

• Used for display boxes, retail packaging, die-cut designs

• Premium configuration for diverse product range

Printing Technology:

Flexographic Printing Process:

• Anilox roll meters ink onto printing plate

• Printing plate (rubber or photopolymer) transfers image to board

• Doctor blade controls ink film thickness

• Water-based inks standard for corrugated (eco-friendly, fast drying)

Print Quality Factors:

• Anilox roll line screen (lines per inch)

• Plate quality and mounting accuracy

• Board surface quality (liner smoothness)

• Ink viscosity and pH control

• Registration system precision

Color Configurations:

• 1-color: Most economical, logos and simple text

• 2-color: Standard for shipping boxes with branding

• 3-4 color: Retail-quality graphics, display boxes

• 6+ color: Premium quality, less common on corrugated

Slotting and Scoring:

Slotting:

• Rotary knives cut vertical slots for box flaps

• Adjustable slot positions for different box sizes

• Slot width and depth critical for folding quality

Scoring:

• Crease wheels create fold lines

• Score depth must match board caliper

• Too deep: Board cracks; Too shallow: Poor folding

• Offset scoring available for inside/outside fold requirements

Key Specifications:

Speed: 80-300 sheets/min

Max Sheet Size: Up to 1600×2800mm

Min Sheet Size: 350×500mm

Board Caliper: 2-10mm

Print Colors: 1-6

Power: 25-60 kW

Price Range (2026):

• 1-color printer slotter: $50,000 - $100,000

• 2-color printer slotter: $100,000 - $200,000

• 4-color printer slotter: $200,000 - $400,000

• With rotary die cutter: Add $80,000 - $200,000

Choosing the Right Configuration:

For Shipping Boxes Only:

• 1-2 color printer slotter + folder gluer

• Focus on speed and reliability over print quality

• RSC box designs only

For Retail and Display Packaging:

• 3-4 color with rotary die cutter

• Higher print quality anilox rolls and plates

• Complex die-cut shapes

For Mixed Production:

• 2-color printer slotter with quick-change print stations

• Separate flatbed die cutter for small-batch custom shapes

• Flexible folder gluer for various box styles

Maintenance Tips:

• Clean anilox rolls daily to prevent ink drying and plugging

• Check printing plate mounting before each run

• Replace slotting knives when cut quality degrades

• Calibrate registration system weekly

• Monitor ink viscosity and pH throughout production

Integration with Corrugating Line:

The printer slotter receives sheets from the corrugating line stacker. Key integration points:

• Sheet size must match corrugating line slitter scorer settings

• Production speed should balance with corrugating line output

• Board quality from corrugator directly affects print quality

• Moisture content at stacker exit affects feeding reliability

Contact Xuegong for complete corrugating and converting line solutions.