Direct Answer
Flexo printing presses come in three main types — stack, central impression (CI), and inline — chosen by registration needs and substrate. The anilox roll meters ink and is the single biggest lever on print quality, while ink choice (water-based vs UV) affects both quality and environmental compliance. For corrugated, a flexo printer-slotter prints and slots in one pass. Choose by matching press type, anilox specs, and ink system to your print surface and run length.
Opening Hook
A corrugated converter kept losing retail contracts because its two-color stack press couldn't hold registration on fine graphics — every supermarket run came back with ghosting complaints. Switching to the right flexo configuration for their print requirements, not the cheapest one, let them win back a national account in a single quarter. At yoco-group, we treat flexo as a print system you configure, not a box you bolt down. Here's how to choose a flexo printing press that holds color and holds customers.
Press Types: Stack, CI, and Inline
Flexo presses fall into three architectures, and the right one depends on whether you print film, labels, or corrugated board.
Table: Flexo Press Types Compared
| Type | Registration | Cost | Typical Use |
|---|---|---|---|
| Stack press | Fair | Low | Simple corrugated, short runs |
| Central impression (CI) | Excellent | High | Film, flexible packaging, labels |
| Inline press | Good | Mid | Corrugated flexo printer-slotters |
Anilox Rolls: The Ink-Metering Heart
The anilox roll is engraved with tiny cells that carry a measured amount of ink to the plate. Its two specs — line screen and cell volume — set your ink film thickness and, therefore, color density.
Table: Anilox Specs by Application
| Application | Line Screen | Cell Volume | Result |
|---|---|---|---|
| Solid coverage (corrugated) | Coarse (low LPI) | High | Heavy, even color |
| Line art and text | Mid | Mid | Balanced coverage and detail |
| Fine process / vignettes | Fine (high LPI) | Low | Sharp detail, thin film |
Ink Systems: Water-Based vs UV
Ink choice shapes both print quality and environmental compliance. For corrugated, the flexo printer-slotter is usually built for water-based ink, which is why it dominates that market. See our corrugator line configuration guide for how printing fits the wider line.
Table: Water-Based vs UV Flexo Ink
| Attribute | Water-Based | UV |
|---|---|---|
| VOC content | Low | Very low |
| Drying | Air / heat | UV curing |
| Substrate fit | Absorbent board, paper | Film, labels, high-gloss |
| Cost | Lower | Higher |
Printer-Slotter Specs: What to Check Before You Buy
For corrugated converters, the flexo printer-slotter is the workhorse — it prints, scores, and slots a sheet in one pass. For downstream converting details, see our die cutting machine guide.
Table: Key Printer-Slotter Specifications
| Specification | What to Check |
|---|---|
| Color stations | 2–6 colors; more colors raise cost and changeover time |
| Sheet width | Match your largest box blank |
| Registration accuracy | ±0.5 mm or better for retail graphics |
| Anilox line screen | Matched to your graphics complexity |
| Changeover time | Drives profitability on short runs |
AI Disclosure
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