Impulse Heat Sealers: How to Choose & Use One for Your Business

An impulse heat sealer melts and bonds plastic film to close a poly bag permanently, using a heated wire that pulses on for a fraction of a second rather than staying hot constantly. Bench top models come in seal widths from 200mm up to 1000mm, with a standard 2.4mm seal or optional 5mm and 10mm wide seals for heavier film. A cutter option trims excess film in the same motion, useful for both finishing bags and custom cutting from poly tubing. Choosing the right size comes down to your bag width and how many bags you’re sealing per shift. Buy a sealer too small and wide bags won’t fit under the bar. Buy one too large for occasional use and you’re paying for capacity you’ll never need. Pinpak’s impulse bench top heat sealers cover the full range, from a compact 200mm bar for small bags up to a 1000mm long arm model for wide or bulk sealing runs.

How an Impulse Heat Sealer Works

An impulse sealer runs a low voltage current through a heating wire for a set fraction of a second, just long enough to melt the film without scorching it. This is different to a constant heat sealer, which keeps the bar hot the whole time and suits continuous production lines rather than intermittent bag sealing. Because the wire only heats on demand, impulse sealers run cooler between uses and are the more practical choice for most packing benches sealing bags in batches rather than nonstop.

Choosing the Right Seal Width for Your Bags

Seal width refers to the length of the sealing bar, which needs to be at least as wide as the bag opening you’re sealing. Pinpak’s bench top sealers run from 200mm up to 1000mm. A 200mm or 300mm bar covers most small to medium poly bags, while 600mm to 1000mm long arm models suit wide bags or bulk packaging like firewood or produce bags. Getting bag and film thickness right matters just as much as sealer width. Our guide on choosing the right packaging thickness explains how gauge affects how a bag seals and holds under load.

Standard, Wide and Extra Wide Seals, 2.4mm to 10mm

The standard seal on most Pinpak bench top sealers is 2.4mm wide, enough for everyday LDPE, HDPE, CPP and BOPP poly bags. 5mm and 10mm wide seals are available on select sizes, giving a stronger bond for heavier film or bags that will carry more weight or handle rough transport. PVC and vinyl can also be sealed on these machines, which widens their use beyond standard poly bags into other flexible packaging materials.

Cutter Option, Trimming and Custom Bag Making

Adding a cutter to your sealer trims excess film in the same motion as sealing, leaving a clean, tidy edge instead of a loose flap of plastic. The cutter option also opens up custom bag making. Feeding stock poly tubing through the sealer lets you cut and seal bags to a length that isn’t available pre made, which can work out cheaper than ordering custom stock. Our article on reducing packaging material costs covers other ways businesses trim packaging spend without cutting corners on quality. For businesses running high volumes, the small extra cost of the cutter option usually pays for itself quickly in labour saved trimming bags by hand.

Bench Top vs Foot Operated Sealers

Bench top sealers are hand operated, lifting the bar down onto the bag, which suits lower volume sealing or businesses without a dedicated packing station. Foot operated sealers free up both hands to hold and position the bag, which speeds up sealing for businesses running higher volumes through a single station. Pinpak also stocks foot operated pedestal and auto foot operated bench models for businesses that outgrow a hand operated bar.

How to Use an Impulse Heat Sealer Correctly

Set the heat and pulse time to suit your film thickness, thicker film generally needs a slightly longer pulse to fully melt and bond. Keep the sealing bar clean. Built up residue from melted film reduces seal quality over time and can cause uneven or weak seals. Let the bar cool briefly between seals if running high volumes back to back, since overheating shortens the life of the heating wire and Teflon strip.

Frequently Asked Questions

What size impulse heat sealer do I need?

Match the sealer’s bar width to the widest bag you regularly seal, with a little extra room either side for comfortable positioning. A 200mm or 300mm sealer covers most small to medium poly bags used for retail or general packing. If you’re sealing wider bags for produce, firewood or bulk goods, step up to a 400mm to 1000mm long arm model. Buying larger than you need adds cost without benefit, so base the decision on your actual bag width rather than future guesswork.

What’s the difference between a standard and wide seal?

The standard seal on most impulse sealers is 2.4mm wide, which suits everyday LDPE, HDPE, CPP and BOPP poly bags under normal handling. A 5mm or 10mm wide seal creates a stronger bond, useful for heavier film, bags that will carry more weight, or products that go through rougher handling during transport. If your bags are regularly splitting at the seal rather than the bag material itself, stepping up to a wider seal is usually the fix.

Should I get a heat sealer with a cutter?

A cutter is worth the extra cost for most commercial users, since it trims excess film in the same motion as sealing, saving time compared to trimming bags by hand afterward. It also lets you cut and seal custom length bags from stock poly tubing, which can be cheaper than ordering pre made bags in a size that isn’t standard. For occasional or very low volume use, a standard sealer without a cutter is a reasonable way to save on upfront cost.

What materials can an impulse heat sealer seal?

Pinpak’s impulse bench top sealers handle LDPE, HDPE, CPP, BOPP, PVC and vinyl film. This covers most poly bags used across retail, food packaging, produce and general warehouse use. If you’re working with a less common film type, it’s worth confirming compatibility before buying, since some specialty laminates or very thick films may need a different sealing method altogether.

How do I stop my heat sealer producing weak or uneven seals?

Weak or uneven seals are usually caused by incorrect pulse timing, a dirty sealing bar or film that’s too thick for the seal width in use. Start by cleaning any melted residue off the bar and Teflon strip, then adjust the pulse time to suit your film thickness, testing on a scrap piece first. If seals are still failing consistently, the film may need a wider seal bar or the heating wire may be due for replacement. Matching seal width, seal thickness and cutter option to your bags is the fastest way to get clean, consistent seals without wasting film. 

Browse Pinpak’s full range of impulse heat sealers to find your size, or call 1300 421 527 to talk through the right model for your business.