Flying marking versus static marking
| Requirement | Flying or online laser | Static laser station |
|---|---|---|
| Product motion | Marks during continuous conveyor or web movement. | Product stops or is held stationary during the cycle. |
| Typical use | Dates, batches and variable data on packaging lines. | Parts, deeper engraving, larger fields or longer cycle times. |
| Timing | Trigger, speed signal, pitch and marking window are critical. | Fixture position and machine cycle control are critical. |
| Handling | Guides, belts or web control keep movement predictable. | A nest, fixture or axis locates the part. |
| Main constraint | Available time falls as line speed and code density increase. | Stop/start cycle can limit overall throughput. |
The parts that make mark-on-the-fly coding work
- Laser source: CO₂, fibre or UV selected by the material and mark.
- Scan head and lens: steer and focus the beam across the defined marking field.
- Product trigger: detects the leading edge or registration event at a repeatable point.
- Shaft encoder: reports conveyor or web movement so code geometry follows speed.
- Product handling: controls position, rotation, vibration, pitch and distance from the lens.
- Controller and data: generate dates, batches, serials and messages from the approved source.
- Guarding and interlocks: prevent hazardous laser access during operation and maintenance.
- Fume extraction: captures process emissions close to the mark.
How is maximum line speed established?
Published scan speed is not the same as proven production throughput. The real limit is the time needed to deliver enough energy for the complete code while the product remains within the usable field. Longer text, larger characters, dense Data Matrix codes and difficult substrates generally demand more marking time.
Product pitch also matters. A line may have a high conveyor speed but generous gaps, or a lower speed with almost no gap between products. Trial the densest message at peak speed and minimum pitch, then confirm the mark remains readable during acceleration, deceleration and normal variation.
Can an online laser be retrofitted?
Often, but a line survey should confirm the marking position, working distance, scan-head orientation, access and services. The conveyor must present the product steadily enough for the required code. Where a bottle, carton or pouch moves unpredictably, side belts, guides or an alternative coding position may be needed.
The integration should define start, stop, fault and ready signals; message selection; line-speed input; guarding interlocks; extraction monitoring; and any code-verification result. Review the wider CO₂ laser production-line integration requirements before treating the coder as a standalone unit.
Information for a reliable quotation
- Representative products and every material, colour or supplier variant.
- Exact code files, fonts, data length and smallest acceptable size.
- Products per minute, conveyor speed, product pitch and speed variation.
- Line photographs, video, drawings and available mounting space.
- Marking position, product orientation and focal-distance variation.
- Control, recipe, network and variable-data requirements.
- Environment, guarding, extraction and planned operator access.