Eight inches is the length people ask for when the pack is small - and it is the length most often bought a size too short, because the bag that decides it is the widest one, not the usual one.
Seal length is the working width of the bar: the longest seal the machine can make in a single press. Around eight inches is the smallest length commonly asked for, and it is matched to genuinely small packs.
The trades that ask for it are the ones whose product is small and whose count is high: sachets and single-serve packets, spare parts and fasteners bagged in small quantities, jewellery and imitation jewellery, pharmaceutical strips and samples, seeds, screws, electronic components, and small food packets sold by the piece.
Before ordering at this length, do one thing. Lay the bag flat on the table, empty, and measure straight across the mouth from fold to fold. That measurement - not the bag's printed size and not its capacity - is what has to fit inside the seal bar.
It is right when every bag you seal is comfortably narrower than the bar, with a little margin so the operator is not aligning the bag precisely on every press. A machine used at exactly its limit is slower in practice, because placement stops being casual.
It is also right when bench space is short. A short bar means a small machine, and on a jewellery counter or a spares desk that is often the deciding factor rather than anything about the film.
Two situations catch people out, and both are worth checking before you order rather than after.
The first is the occasional wide bag. Most units have one product that comes in a bigger pack, and if that bag is wider than the bar it has to be sealed in two overlapping presses. The overlap is where it leaks, and the double line across the top is visible to whoever receives it.
The second is growth. If you are adding pack sizes, the seal bar is the part that stops you, and the cost difference between one length and the next is small against the cost of buying twice.
A short bar and a long bar are the same machine in every other respect. Choosing a shorter length does not make a machine gentler on thin film, and choosing a longer one does not make it capable of sealing a heavier liner.
Film thickness is a separate limit and it is set by the heating arrangement, not by the bar length. If your problem is that a heavy or laminated bag will not close, buying a longer machine will not fix it.
The width of your widest bag measured flat, what the bag is made of, and how many you seal in a day. We quote the seal length against your bag rather than asking you to pick one from a list, because the list is not the thing that decides it.
If the widest bag turns out to be wider than eight inches, we will say so - the point of asking is to stop you buying a machine that has to work in two passes.
The units that buy at this seal length usually have a second problem that has nothing to do with sealing: they are counting.
Bagging screws, washers, seeds, tablets, small components or beads means somebody is putting a fixed number into each bag, and that is almost always slower than the sealing. Buying a faster sealer when the count is the limit changes nothing at all, which is why we ask what happens before the bag reaches the machine.
Where the count is by weight rather than by piece, the useful upgrade is usually a scale at the bench rather than a different sealer. Where it is genuinely by piece, it stays manual until volumes are far higher than most units at this seal length have.
None of that stops a small bench sealer being the right machine. It just means the honest advice is often to spend the money elsewhere, and we would rather say that than sell you the next model up.
Lay the bag flat on the table, empty, and measure straight across the mouth from fold to fold. That measurement - not the bag's printed size and not its capacity - is what has to fit inside the seal bar. Buy a bar longer than that measurement.
You can, and it is what happens when the bar is too short - but the overlap is where the seal leaks and the double line is visible on the pack. It is not a plan, it is a symptom.
No. Length and film thickness are separate limits. A short machine is not gentler and a long one is not stronger on heavy film.
Send us your widest bag measured flat and we will confirm the length against it. That is more reliable than choosing a standard size and hoping.
Only if sealing is the slow step. At this size the count is usually slower than the machine, and a scale at the bench does more than a bigger sealer.
The width of your widest bag measured flat, what the bag is made of, and how many you seal in a day. That is enough for a straight answer — including the times when the cheaper machine is the right one.
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