Thermal labels for scales and shipping: the right roll

Thermal label rolls for scales and shipping printers look alike, but they aren't interchangeable. The right roll depends on your printer type, label size, core size, and how long the label needs to last. Direct thermal labels are the most common in small stores. Match the roll to your printer's specs, and store spares away from heat and sunlight.

A mismatched roll jams, prints faintly, or doesn't fit at all. Here's how to get it right the first time.

Direct thermal or thermal transfer?

There are two main thermal printing methods.

Direct thermal. The printer heats special coated labels, and the coating darkens where it's heated. No ink or ribbon. Most scale label printers and many small shipping printers use this. Wikipedia's page on thermal printing explains how it works.

Thermal transfer. The printer heats a ribbon, which transfers ink onto the label. Labels last longer and resist heat and light better, but you need ribbons.

Direct thermal is simpler and cheaper for short-lived labels, like deli packs or shipping labels. Thermal transfer is better for labels that need to last months, like shelf labels in bright areas or asset tags.

Check your printer. A direct thermal printer can't use thermal transfer ribbons, and thermal transfer labels won't print on a direct thermal printer without a ribbon.

What sizes and specs matter?

Check four things before buying.

Label size. Width and height. Scale labels are often small. Shipping labels are larger, often 4 by 6 inches, but check what your printer and carrier need.

Roll diameter. The outside size of the full roll. It has to fit inside the printer.

Core size. The cardboard tube in the center. Printers are designed for specific core sizes.

Label type. Gap labels (with space between each label), black mark labels, or continuous rolls. Your printer's sensor needs the right type to find the start of each label.

Write your printer's specs on a card and keep it with your supplies. Anyone reordering can check it.

How do scale labels differ from shipping labels?

Scale labels are usually small and carry product name, weight, price per pound, total price, and a barcode. They're often printed at a deli, meat, or produce counter.

They need adhesive that sticks to plastic containers, wrap, and sometimes chilled or damp surfaces. Some are designed for refrigerated or frozen items.

Shipping labels are larger and carry addresses and carrier barcodes. They need to stay readable through handling and sometimes weather.

Using the wrong adhesive causes trouble. A standard label on a cold, damp container may peel off before the customer reaches the register.

How should you store thermal labels?

Direct thermal labels react to heat and light. That's how they print, and it's also how they fade or darken in storage.

Keep spare rolls in a cool, dry place away from sunlight.

Don't store them near ovens, fryers, heaters, or windows.

Keep them in their packaging until needed.

Use older rolls first.

Here's a hypothetical. A deli stores its spare scale label rolls on a shelf above the oven because it's convenient. Labels start printing gray and faint. Moving the rolls to a cool cabinet fixes it for the next batch. Heat damage is easy to cause and easy to avoid.

Browse the paper rolls category on NRS Marketplace to see the label and roll types available, and compare each against your printer's specs. For price guns and labels, check the label guns category.

It also pays to write the exact roll specs on the inside of the printer cover with a small label. When someone reorders in a hurry, they can match width, core, and label type in seconds instead of guessing, and you avoid a box of rolls that won't fit.