When a batch code is clear at the packing table but difficult to read at a warehouse rack or loading bay, the problem is not always the printer. Often, the code was approved for the wrong viewing distance.

There is no single “correct” batch-code size for every product in Malaysia. The practical question is: who needs to read or scan the code, where are they standing, and what must they do next? This guide gives production, QA and warehouse teams a simple way to make that decision before a new artwork or coding layout goes live.

Start with the person who uses the code

A batch code can be used by different people at different points in the workflow. An operator may check it close to the print station. A QA team member may inspect it during release. A warehouse team may identify an outer carton while handling stock. A customer may read it only after receiving the product.

These are different jobs. Write down the main user and action before deciding the character height or code location:

• Packing operator: confirm that the correct job or date was printed.
• QA checker: inspect the mark against the approved artwork or production record.
• Warehouse team: distinguish cartons, lots or destinations during picking, staging and loading.
• Receiver or customer: identify a batch when a product is already in use or under review.

One small code may be suitable for a close-up pack check but unsuitable as the only identifier on an outer carton. That does not automatically mean every code must be large; it means the design should match the real task.

Viewing distance changes the decision

Use the normal working distance, not an ideal close-up inspection, when assessing legibility. Ask the warehouse supervisor where the carton is normally read: in the hand, on a pallet, at a staging area or on a rack. Then look at a real sample from that position under normal site lighting.

A generic millimetre chart cannot replace this exercise. Pack format, code content, contrast, lighting, line breaks and the reader’s task all affect whether a mark is useful. The safest approach is to compare two or three candidate layouts on the actual material and approve the one that works in the real workflow.

Viewing distance vs. suggested character-height approach

Normal viewing situation	Suggested starting character-height approach	What to check on the printed sample
Close-up pack check at the print station	Start with the smallest candidate that keeps the full code clear.	Can the operator and QA checker read every character without moving the pack into unusually bright light?
Arm’s-length check during packing or release	Compare a medium candidate with the close-up option.	Can the code be read quickly at the normal standing position?
Outer carton at pallet, staging or loading area	Begin with a larger candidate or a separate carton layout.	Can the intended user identify the lot or batch from the usual floor position after normal handling?
Rack or distance-based identification	Do not rely on small batch text alone; consider a more visible outer-carton layout or a suitable scannable identifier.	Can the workflow identify the carton reliably without a close-up search?

This is a planning table, not a universal size standard. Confirm the final character height using printed samples on the actual pack, in the normal environment and with the people who use the code.

Code location, contrast and lighting are part of legibility

A larger code can still be difficult to use when it is placed across a carton seam, too close to a fold, under stretch wrap, on a curved pack, or in a low-light area. Position the code on a reasonably flat, visible area where it will not be hidden by normal handling, labels or closures.

Make the intended reading surface part of the artwork review. Check the finished pack rather than only a screen preview. If the background, coating or packaging material changes, repeat the sample check because the appearance of the mark can change too.

Human-readable text and machine-readable symbols need separate checks

A printed batch number, barcode, QR code or Data Matrix symbol may appear together, but they do not serve exactly the same purpose. Increasing the size of the human-readable text does not by itself prove that a machine-readable symbol can be scanned successfully.

Where a barcode or 2D symbol is used, test it with the scanner and process that will actually be used. Confirm the encoded data, the printed placement and the normal handling condition. For help deciding which data carrier is appropriate, see PTS Technology’s barcode, QR code and Data Matrix selection guide.

A practical sample-test method before approval

1. Define the job. State who will read or scan the code, what information they need and the normal viewing distance.
2. Prepare options. Create two or three layouts with different text size, line arrangement or print position.
3. Print on the real substrate. Use the actual carton, pouch, label or product surface where possible.
4. Check the normal environment. View samples at the packing line, warehouse location or loading point under ordinary lighting.
5. Test the handling path. Check after normal stacking, wrapping or movement if those steps may affect visibility.
6. Test scanning separately. If a machine-readable symbol is included, test it with the intended equipment.
7. Record the decision. Keep the approved artwork, print position, sample date and responsible reviewer with the job information.

This turns code-size approval into a repeatable workflow rather than a personal preference. It also supports the broader pre-start checks covered in PTS Technology’s batch-coding quality-control checklist.

Why outer cartons may need a different approach

The primary pack and outer carton may carry similar batch information, yet their readers and viewing distances can be different. A code read at arm’s length on a small pack can be different from a carton identifier used during storage or dispatch. Consider whether the outer carton needs a separate, more visible layout rather than simply copying the primary-pack mark.

Review the code again when carton dimensions, print panel, pallet pattern, warehouse layout or receiving process changes. A layout that worked for one product format is not automatically suitable for another.

Choose coding equipment after the visibility requirement is clear

It is easier to assess a coding solution once the required mark is defined. Prepare the intended content, available print area, target position, substrate and workflow. Then discuss the application with PTS Technology so the team can assess suitable BENTSAI coding options for the job. A sample check remains important before routine use.

Frequently asked questions

Is there one correct batch-code size for every Malaysian product?

No. The suitable size depends on the user, viewing distance, packaging, lighting, code content and workflow. Test on the actual product and at the actual point of use.

Should the code on an outer carton be larger than the code on the primary pack?

Not always. It may need a different layout when it is read farther away or during warehouse handling. Review each pack level according to its intended use.

Does larger human-readable text make a barcode or QR code easier to scan?

No. A machine-readable symbol should be tested separately with the intended scanner, encoded data and process conditions.

When should a warehouse team be involved in code-size approval?

Involve them when the code will be used for picking, staging, stock identification, loading or receiving. They can confirm the normal viewing distance and handling conditions.

What should be tested before approving a new code size?

Test printed samples on the actual substrate, from the normal viewing position, under ordinary lighting and after any handling that can affect visibility. Test scanning separately where relevant.

Plan the code around the real task

Before changing an artwork or coding layout, share a sample of the packaging, the intended code content, the print location and the people who need to use it. PTS Technology can help Malaysian manufacturers evaluate the application and discuss suitable BENTSAI coding options. Contact PTS Technology to arrange an application discussion.