The Relationship Between Anilox Roller Cell Depth and LPI: How to Accurately Match Printing Requirements?

In the printing and packaging industry, the quality of the anilox roller directly affects ink transfer uniformity and print results. Among its key parameters, cell depth and LPI (lines per inch) play a critical role in determining ink volume, transfer efficiency, and print clarity.

As a professional printing roller manufacturer, JCTPRINT (www.jctprintco.com) will explain the relationship between cell depth and LPI to help you select the optimal anilox roller, improve print quality, and reduce costs.

1. What Are Anilox Roller Cell Depth and LPI?

(1) Cell Depth

Cell depth refers to the depth of each microscopic pit (cell) on the anilox roller’s surface, typically measured in microns (μm). It directly influences ink capacity and release performance:

• Deeper cells → Higher ink volume, suitable for high-coverage printing (e.g., white ink, spot colors).

• Shallower cells → More uniform ink release, ideal for fine-detail printing (e.g., high-resolution graphics).

(2) LPI (Lines Per Inch)

LPI indicates the number of cells per inch on the anilox roller. Higher LPI means denser cells, enabling finer print details:

• Low LPI (e.g., 150-200 LPI) → Best for corrugated boxes, thick cardboard, and coarse substrates.

• High LPI (e.g., 600-1200 LPI) → Used for films, labels, and premium packaging requiring precision.

  

2. How Do Cell Depth and LPI Affect Print Performance?

(1) Higher LPI = Shallower Cells

• High-LPI rollers (e.g., 800 LPI) have smaller, tightly packed cells with shallower depths to ensure smooth ink release.

• Ideal for high-precision printing (e.g., cigarette packaging, pharmaceutical labels), but ink volume is lower, potentially requiring adjusted ink viscosity.

(2) Lower LPI = Deeper Cells

• Low-LPI rollers (e.g., 200 LPI) feature larger, deeper cells that hold more ink, suitable for solid-area printing.

• Excessive depth may cause uneven ink release, leading to ghosting or ink misting.

(3) Optimal Matching Guidelines

3. How to Select Cell Depth and LPI Based on Substrate?

(1) Corrugated Printing

• Recommendation: 150-250 LPI, deeper cells

• Rough surfaces require higher ink coverage; deep cells ensure sufficient transfer.

(2) Plastic Films / Flexible Packaging

• Recommendation: 400-800 LPI, medium depth

• Prevents ink pooling while maintaining sharp detail.

(3) Labels, Cigarette Packaging (High Precision)

• Recommendation: 800-1200 LPI, shallow cells

• Ensures fine halftone reproduction and reduces clogging risks.

  

4. Frequently Asked Questions (FAQ)

Q1: What problems arise if cell depth is too high?

• Poor ink release, uneven prints, slow drying, and potential misregistration.

Q2: How to measure anilox roller LPI and cell depth?

• Use a microscope with CCD measurement or specialized inspection equipment (JCTPRINT offers testing services).

Q3: Do different inks (water-based/UV/solvent) require specific cell depths?

• Water-based inks: Lower viscosity, work best with shallower cells.

• UV inks: Higher viscosity, need slightly deeper cells (but excessive depth may hinder curing).

  
  

  

5. Conclusion: Optimize Print Quality by Balancing Cell Depth and LPI

Selecting the right cell depth and LPI is crucial for superior print results. If unsure, JCTPRINT provides expert guidance and custom anilox rollers tailored to your needs.