Direct answer
Code verification must check more than ink presence. Define the expected date, batch and format from a controlled data source, inspect the correct print area, verify legibility and value, reject or stop on failure, and preserve records that link the result to the batch.
Define what “correct code” means
Specify text, format, date calculation, batch source, time zone, rollover and line identifier. Decide whether the system checks presence, readability, exact content or all three.
An ink sensor can detect a mark but cannot prove that the printed date is correct.
Control data entry and recipes
Transfer expected data from an approved production order or controlled recipe where practical. Use confirmation and access control for manual entry.
Record changes and prevent the printer and camera from using different product or date rules.
Create a stable image and print process
Control printhead distance, trigger position, encoder speed, ink or ribbon, substrate, drying and pack presentation. Use lighting that reveals low contrast without creating glare.
Test the longest code and fastest line speed, including start-up and after planned printer cleaning.
Define fault and product-hold responses
Set action for no code, unreadable code, wrong value and communication loss. Track the affected pack to a reject or stop the line before product identity is lost.
If the expected data cannot be verified, define the time window and product quantity to hold for investigation.
Information to prepare
- Approved code format and data source
- Date rollover and batch-generation rules
- Printer and camera recipe linkage
- Print area, contrast and pack control
- Presence, legibility and value acceptance
- Reject or line-stop response
- Audit trail and affected-product procedure
Coding Machinery
Date, batch, lot, barcode and QR coding routes for production packaging.