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Continuous Inkjet Printer / Case Coder Resources

Date Coding Equipment: Comparing Today's Leading Date Coding Technologies

Key Takeaways

Continuous Inkjet (CIJ) printers print faster than contact-based date coders, at speeds up to 600 m/min, making them the standard choice for high-volume lines processing 300+ units/minute.
Integrated vision inspection (available on KEYENCE's MK-G Series via one-click LAN connection to IV4/CV-X Series) enables automated print verification and OCR validation, supporting traceability and quality-control programs.
Self-diagnostic maintenance cuts manual cleaning time dramatically and reduces solvent consumption, turning a multi-hour weekly task into a few minutes.
Non-contact printing works across metal, glass, plastic, paper, and flexible film without equipment changeover, so one printer can serve multiple product lines.
Variable data integration allows real-time printing of serialization, batch codes, and database-driven content, critical for compliance in food, pharmaceutical, and automotive manufacturing.

Date coding equipment is commonly used for printing expiration date, best by date, or manufacturing date on food packaging or products that require traceability. There are many factors to consider when selecting the right type of date coding equipment such as operating environment, production volume, materials being printed, as well as print content.

Why Date Coding Matters

Date coding equipment prints expiration dates, "best by" dates, manufacturing dates, lot numbers, and batch codes onto packaging and products. Beyond consumer information, this coding is often a regulatory requirement, supporting FDA, EU, and industry-specific compliance, and it's foundational to supply chain traceability, recall management, and inventory control.

Choosing the right date coder depends on four factors:

Operating environment — temperature, humidity, line speed, and available space
Production volume — units per minute and shift-length throughput needs
Substrate type — porous vs. non-porous materials, curved vs. flat surfaces
Print content — static text vs. variable data, single-line vs. multi-line, barcodes/QR codes

The sections below compare the major technology types, then take a deep dive into Continuous Inkjet, the technology best suited to high-speed, high-compliance production environments.

Date Coding Technology Comparison

Technology	Best For	Contact Type	Typical Speed	Substrate Range
Continuous Inkjet (CIJ)	High-speed, high-compliance lines	Non-contact	Up to 600 m/min	Metal, glass, plastic, paper, film
Handheld Stamper	Low-volume, irregular targets	Contact	Manual, low	Varies; prone to bleed/drying issues
Handheld Labeler	Retail, price/date labeling	Contact (label)	Manual, low	Flat or near-flat packaging
Roller Stamper	Conveyor-fed cardboard	Contact	Line-speed dependent	Cardboard, porous materials
Label Printing Machine	Batch food labeling	Contact (label)	Moderate	Water-resistant label stock
Hot Printer	Older pillow-pack machines	Contact	Moderate	Packaging film
Thermal Printer	Flexible print content, retail	Contact (heated head)	Moderate	Film, label stock

Understanding How Continuous Inkjet (CIJ) Technology Works

Continuous Inkjet is the workhorse of industrial date coding, a non-contact printing method built for speed, consistency, and integration with quality-control systems.

The basic process:

Ink pressurization — Ink is continuously forced through the nozzle.
Droplet formation — The ink stream breaks into tiny droplets.
Electrostatic charging — Selected droplets receive an electrical charge.
Deflection plate guidance — An electric field directs charged droplets onto the substrate.
Gutter recirculation — Unused droplets are captured and returned to the ink system.

Unlike drop-on-demand inkjet, CIJ continuously circulates ink, allowing for high-speed, non-contact printing on moving products. This makes CIJ well suited to fast production lines, including applications requiring printing from a distance, at an angle, or onto curved or irregular surfaces.

Advanced CIJ Features in Modern Systems

Variable Data Integration

Supports receiving real-time data from production databases (SQL, CSV, Excel)
Generates barcodes and 2D codes (GS1-128, DataMatrix) alongside text
Updates print content automatically as products or batches change, no manual reprogramming required

Print Quality Optimization

Industrial CIJ resolution typically ranges from 100–600 DPI
Multi-line printing (the MK-G Series supports up to 6 lines)
Character heights adjustable from roughly 0.6mm to 12.7mm depending on application

Substrate Versatility

Non-porous: glass, metal, plastic, using specialized inks formulated for adhesion
Porous: cardboard, paper, using fast-drying formulations
Typical operating temperature tolerance spans roughly -10°C to 45°C, though this varies by model and ink type

Common substrates in the field:

Cans

Packaging film

Cartons

Glass containers

MK-G Series: Integrated Features Worth Knowing

KEYENCE's MK-G Series is a continuous inkjet date coder built around two key differentiators: inspection integration, and self-diagnostic maintenance.

1. Integrated Vision Inspection

Most coding setups require pairing a printer with a separate inspection system, meaning multiple vendors, complex integration work, and manual programming to get the two systems talking to each other.

The MK-G Series connects to KEYENCE vision and inspection systems (IV4 Series, CV-X Series) over a standard LAN cable:

IV4 Series link enables instant presence/absence inspection of the printed code
CV-X Series link adds full OCR verification of printed content
Settings, judgment character strings, and image capture triggers transfer automatically — no manual setup on the inspection side
Products with missing or incorrect print can be flagged before they leave the line

Easily link to a print inspection device with just a LAN cable.

Request a live demo of LAN-based print verification.

System components:

1

Continuous Inkjet Printer — MK-G Series
2

Intuitive Vision System — CV-X Series
3

Vision Sensor with Built-in AI — IV4 Series

2. Self-Diagnostic Maintenance

Traditional CIJ printers require regular manual cleaning to prevent clogged nozzles, dirty print heads, and unplanned downtime. The MK-G Series reduces this maintenance burden with:

Self-diagnosis identifies common issues and provides troubleshooting guidance
One-button cleaning replaces manual head-cleaning procedures
Smart startup — The MK Dock automatically initiates optimized head cleaning.
Optimized solvent usage — self-diagnosis tunes cleaning cycles to help reduce solvent consumption

	Conventional Head Cleaning	MK-G Series Uniform Cleaning
Process	Manual removal of ink adhered inside the head	Press a button - cleaning and troubleshooting handled automatically
Startup	Manual setup each time	Smart startup via MK Dock
Solvent use	Standard	Optimized through self-diagnosis

Conventional head cleaning

Manual cleaning had to be performed to remove ink that adhered inside the head.

Smart startup

Just placing the print head in the MK Dock starts optimal cleaning of the main head parts.

Alternative Date Coding Technologies

Continuous Inkjet isn't the right fit for every application. These alternative date coding technologies can make sense depending on production volume, substrate, and packaging setup.

Handheld Stampers

Fast-drying ink is transferred manually from type to the target surface. They're suited to low-volume or difficult-to-print applications, but can suffer from inconsistent pressure, bleeding, and drying.

Handheld Labelers

Handheld labelers apply printed date or price labels directly to products. They're useful in retail and low-volume environments, but manual applications can limit speed and consistency.

Roller Stampers

Roller stampers transfer water-based ink onto porous materials such as cardboard as they move along a conveyor. They're simple and effective for compatible substrates, but their ink limitations make CIJ more versatile across different materials.

Label Printing Machines

These machines use thermal printing to produce water-resistant labels with flexible layouts. They're well suited to batch labeling, but labels add consumable costs and an extra application step.

Hot Printers

Hot printers transfer ribbon-based ink onto packaging film using heat, often on older pillow-packaging lines. They remain practical for legacy equipment but offer less flexibility for modern variable data requirements.

Thermal Printers

Thermal printers use a heated print head and ribbon to apply changeable content without traditional type pressing. They're useful when print content changes frequently but remain contact-based and ribbon-dependent compared with CIJ.

Selecting the Right Date Coding Equipment: A Decision Framework

Use this quick self-check to gauge whether Continuous Inkjet is the right fit:

Production line exceeds 200 units/minute
Multiple substrate types require coding
Regulatory compliance requires reliable print verification
Variable data changes with each product (serialization, batch codes)
Non-contact printing is required (delicate surfaces, curved objects, moving targets)
Current maintenance routine takes several hours per week

Scoring guide: 0–2 checked → alternative technologies may suffice · 3–4 checked → CIJ is likely the better fit · 5–6 checked → CIJ is likely essential for your operation

Interested in improving your date coding process? KEYENCE's MK-G Series continuous inkjet printers combine LAN-based inspection integration with self-troubleshooting maintenance, built for reliable, high-speed operation.

Contact us to learn more about the MK-G Series and how it fits your production line

Contact us to learn more about how our advanced technology can help take your business to the next level.

Frequently Asked Questions

What's the Difference Between Continuous Inkjet and Drop-on-Demand Inkjet Printers?

Continuous inkjet (CIJ) systems circulate pressurized ink for high-speed, non-contact printing from a distance or at an angle. Drop-on-demand (DOD) systems eject ink only when needed, offering higher resolution at slower speeds. CIJ is best for high-speed production, while DOD suits detailed, lower-speed printing.

Can Continuous Inkjet Printers Print on Curved or Irregular Surfaces?

Yes. Because CIJ is non-contact, it's well suited to curved, cylindrical, or irregular targets, bottles, pipes, etc. since the print head doesn't physically touch the surface and can print from a range of distances and angles.

What Industries Require Date Coding Equipment?

Most manufacturing sectors that produce packaged or traceable goods use date coding, including food & beverage (expiration/lot codes), pharmaceutical (serialization and regulatory compliance), cosmetics (batch tracking), and electronics/automotive (component-level traceability for warranty and recall management).

How Do I Know if I Need Continuous Inkjet vs. a Simpler Date Coder?

Use the decision framework above. If your line runs at high volume, spans multiple substrates, or needs verified/variable print content, CIJ is typically the better long-term investment.

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