Why You Should Use an 8-Inch Thermal Printer to Print A5 Barcode Labels

Many warehouse and manufacturing systems rely on A5 pallet labels containing high-density barcodes. Producing these labels on a standard 6-inch thermal printer is not always the most efficient approach, as the barcode orientation is often incorrect.

Microplex A4-width (8-inch) thermal printers allow large labels to be printed in their natural orientation, ensuring accurate barcode reproduction, high print speeds and reliable scanning in warehouse environments - without having to change your SAP®/ERP templates.

Thermal printers create images using a stationary printhead containing thousands of heating elements. As the printhead activates, the label media moves through the printer while the dots are being formed.

This means each printed pixel is created while the label is physically moving past the printhead.

Because of this process, the dots produced by a thermal printer are not perfectly round. Instead, they become slightly elongated in the direction the label is travelling.

For text and graphics this effect is usually insignificant. However, when printing precision barcodes, this physical behaviour of thermal printing becomes important.

The Challenge with Thermal Barcode Printing

An illustration of a printed pixel that is run against it’s natural orientation.

Why Barcode Direction Matters

Many logistics labels are produced in A5 format (210 × 148 mm).

On a typical 6-inch thermal printer, these labels often need to be rotated to fit within the available print width.

When the label is rotated, the barcode orientation changes and the bars end up running across the feed direction. This increases the risk of barcode distortion during printing. As the picture opposite illustrates, printing a barcode in the wrong orientation means the bars run across the print direction, which increases the risk of distortion and reduces scanning reliability.

For organisations that rely on fixed label templates generated by ERP systems such as SAP®, rotating or redesigning labels is often not practical.

This creates a common challenge in warehouse printing systems.

Barcode orientation relative to the print direction on a thermal printer can affect barcode accuracy and scanning reliability

Extending Printhead Life

Industrial thermal printers rely on precision printheads containing thousands of microscopic heating elements. These elements activate in rapid pulses to create the dots that form text, graphics and barcodes on the label surface.

Because the media moves through the printer during printing, each element must switch on and off extremely quickly while the label passes beneath the printhead.

When barcodes are printed in the correct orientation relative to the paper feed direction, each heating element is only active for a very short period of time as the label moves past. This distributes heat evenly across the printhead and allows the elements to cool between pulses.

However, when barcode bars run across the print direction, large sections of the printhead may remain active simultaneously in order to produce wide horizontal bars.

Correct barcode orientation distributes heat across the printhead more evenly, helping extend the life of the heating elements.

As illustrated above, when the barcode is aligned with the print direction, individual heating elements activate briefly as the media moves forward. The workload is distributed across the printhead rather than concentrated in one area.

When barcodes are printed perpendicular to the feed direction, the same elements may remain active for longer periods to generate wide bars. Over time this can lead to:

• increased thermal load on the printhead
• uneven heating across heating elements
• accelerated wear of individual pixels
• reduced printhead lifespan

Maintaining the correct barcode orientation therefore not only improves barcode readability, but also helps protect one of the most important components in the printer.

For high-volume warehouse and manufacturing environments, this contributes to more consistent print quality and longer operational life for the printhead.

Print Labels in Their Natural Orientation

The most effective way to maintain barcode accuracy, printing performance and printhead longevity is to ensure labels can be printed in their natural orientation.

When labels are printed without being rotated to fit the printer width, barcode bars remain aligned with the paper feed direction. This allows thermal printing elements to operate as intended, producing consistent bar widths while distributing heat evenly across the printhead.

Industrial printers designed with A4-width (8-inch) print capability allow large labels to be produced without adjusting the original label layout. This means barcode orientation can remain correct while maintaining high production speeds.

A typical VDA label used in the automotive industry contains a large amount of information and is best printed in its natural orientation using an 8-inch thermal printer.

Microplex Solutions

Microplex manufacturer a range of 8-inch wide printers that allow A5 labels to be printed in their natural orientation.

For organisations using SAP® or ERP-generated labels, Microplex printers allow existing hard-coded label formats to be printed correctly without requiring changes to the original system.

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