Throat Width: Buying a Laminator That Fits Your Work

Throat width is the physical opening a laminator will accept. It is the one specification that cannot be worked around: no setting, no technique and no thinner pouch makes a sheet fit a slot narrower than the sheet.

The common sizes

• 9 inch (about 230 mm): takes letter and A4 fed portrait. The most common home and small-office size.
• 12–13 inch (about 320 mm): takes A4 landscape, legal, and A3 fed portrait on the wider models. The practical choice for a workplace.
• 17 inch and above: A2 and posters. Larger, slower to warm up, and more expensive.

Note the qualifier on 13 inch: A3 is 297 mm on the short side, so a 13-inch (330 mm) machine takes it and a 12-inch (305 mm) machine just about does. Check the millimetre figure rather than the inch label if A3 matters to you.

Buy one size larger than your current work

The most common regret is buying at exactly the size needed today. A 9-inch machine cannot do a single A3 job ever, and the moment one appears you are hand-feeding it to a print shop.

The step from 9 to 13 inch is usually modest in price and it removes an entire class of “we cannot do that here”.

The other specifications, in order of how much they matter

1. Warm-up time

The difference between a machine people use and a machine people avoid. Under 2 minutes and it gets switched on for a single card. Over 5 minutes and it gets switched on twice a week for batches.

Fast warm-up usually indicates more heating elements, which also gives more consistent results at speed.

2. Jam release

A lever that separates the rollers. Without one, a jam means either reverse (if fitted) or pulling against engaged rollers, which damages the drive. Treat this as essential rather than a feature.

3. Number of rollers

Two-roller machines are entry level. Four and six-roller machines apply pressure over a longer path, which produces flatter results with fewer bubbles, particularly on thicker pouches.

4. Adjustable thickness or speed

A single-setting machine is optimised for one pouch thickness. If you use both 3 mil and 5 mil, a machine with a selector will do both properly.

5. Cold setting

For heat-sensitive originals — thermal receipts, some photographs, anything already laminated. Uses pressure-sensitive pouches rather than thermal ones. Genuinely useful occasionally, and worth having if you ever laminate old documents.

6. Auto shut-off

A hot machine left on all night is a fire risk and a cost. Most modern machines have it; check.

Machine, or kit

Kits bundle the laminator with a trimmer, a corner rounder and a starter pack of pouches. They are good value if you need those things, and the corner rounder in particular is more useful than it looks — rounded corners are what stops laminate lifting.

Buy the machine alone if you already have a trimmer, or if you need a specific pouch thickness the kit does not include.

Duty and volume

Home machines are designed for intermittent use. Running fifty items back-to-back through a small machine will overheat it and the later items will come out wavy. If you regularly do batch runs, look at the stated duty rating or move up a class.

Space and cooling

Laminators need clearance behind them for the item to exit flat. A machine pushed against a wall curls its output. Allow the length of your longest sheet behind the machine, and let items cool flat under a weight if you want them dead flat.

Compare our Thermal Laminators and Laminator Kits, or ask us what fits your document sizes.