Ultrasonic Lace Sewing Machine
No needle and no thread. A 20 kHz horn vibrates against a steel pattern roller, and the non-woven or synthetic fabric running between them comes out welded, embossed or slit in a single pass. The seam is made inside the material itself — so the edge cannot fray, and there is nothing to re-thread.
The roller presses, the horn vibrates, the fibres melt together
Fabric is fed between two parts: a steel pattern roller above the table and an ultrasonic horn below it. The horn vibrates 20,000 times a second while the motor turns the roller, and the pressure between the two concentrates that vibration into the material. Along that narrow line the thermoplastic fibres soften, flow into each other and set again as the fabric leaves the roller.
Because the energy is applied only where the roller touches, the joint is a controlled band: the rest of the fabric is untouched, the surface keeps its hand, and the edge comes out closed instead of cut open. Change the roller and the same machine makes a different seam — a straight weld, a zigzag lace pattern, an embossed row or a clean slit.
Nothing is added to the joint. No thread, no glue, no tape and no needle holes — which is why a sealed edge cannot come undone the way a stitch can when one length of thread breaks.
Six parts, and what each one is for
The machine is a frame, a table, a head and a generator. The head travels on a heavy support board under a flat steel top, so a long run of fabric stays level from the first metre to the last, and the bottom mould holds the welding line in place instead of letting it wander with the material.
Speed is set once and held by a single motor drive. The roller is lifted by hand as standard, or pneumatically when the same movement is repeated all day. Because the generator is a separate box, it can sit where the operator can reach it — or be moved aside when the machine is built into a line.
The roller decides what the seam looks like
One machine, one generator, one head — the pattern lives in the roller. Swapping it takes minutes, and the same machine then seals a folded edge, embosses a quilted row, closes a filter pleat or welds lace.
Rollers are machined and hardened in our own workshop, so a pattern you already run can be re-made to match, and a new one can be cut from your drawing or from a sample of the seam you want. Send us a sample of the seam and we will tell you what it takes.
Four numbers are set for every job
Nothing about this machine is hidden in a menu. There is no needle to thread, no tension to balance and no stitch program to load — four settings cover the job, and they are all on the front of the generator.
Set them once for a material and write them down. Two production runs a month apart then come out the same, whichever operator is at the table.
Weld time
How long the 20 kHz energy is applied. Longer for thick felt and multi-layer non-woven, shorter for a thin film that would otherwise burn through.
Hold time
How long the roller keeps pressing after the vibration stops, so the seam sets under pressure instead of springing open as the roller lifts.
Amplitude
How far the horn travels. Turned down for delicate or coated fabric, turned up for heavy non-woven and dense filter media.
Counter
Counts the parts as they go through, so the operator knows where the batch stands without keeping a separate tally.
Machine data
Ultrasonic lace sewing machine — specification
| Item | Data |
|---|---|
| Source power | 220 V ± 5 V, 50/60 Hz, 6 A |
| Input power | 1500–2500 W, adjustable |
| Output frequency | 20 kHz |
| Working speed | 0–20 m/min |
| Roller size | Width 0–100 mm, diameter 50–60 mm |
| Working temperature | ≤ 25 °C |
| Roller lifting | Manual (pneumatic optional) |
| Start | Foot pedal, for hands-free feeding |
| Packaging dimension | 1200 × 600 × 1200 mm |
| Gross weight | 130 kg |
At a glance
The same head and generator, whatever pattern you run — only the roller and the three settings change.
Where a sealed edge replaces a stitched one
The machine is bought for one job and used for many. Anywhere two layers of non-woven or synthetic fabric have to be joined, closed or patterned, the same head does the work — only the roller changes.
Textile and apparel
Lace pattern cutting on garments and lingerie, seam sealing that stops fraying and adds durability, and quilting lines across a panel.
Medical and hygiene
Disposable gowns, masks, surgical drapes and covers — bonded non-woven instead of stitched, so there is no needle hole through the barrier.
Filtration
Air, liquid and oil filter media: pleat sealing, end seals and bag edges, welded without adhesives that could clog or outgas.
Packaging
Bags, pouches and packaging materials sealed or embossed to size, including ziplock and anti-counterfeit wine caps.
Stationery and print
Folders, document holders, book covers and packaging inserts, welded clean enough to be sold as the finished surface.
Branded and custom patterns
Your own pattern roller for a logo, a repeating motif or a lace design — cut to your drawing, so the pattern belongs to you.
Medical non-woven is where the difference is easiest to see. An ear loop welded onto a mask is bonded into the material along the whole contact line, so it has no stitch line to tear through and no needle holes in the barrier layer.
The same applies to a filter pleat, a gown seam or a bag edge: the joint is as continuous as the fabric around it, and it is finished the moment it leaves the roller.
See the full non-woven and textile application page for more of the work this machine does.
What changes when the thread goes away
| Sewing with thread | Ultrasonic sealing | |
|---|---|---|
| What you buy per metre | Needles, thread and bobbins to keep in stock | Nothing — the machine and the roller are the whole consumable list |
| The edge | Cut open, so it can fray and needs finishing | Welded closed in the same pass |
| Where it can fail | A broken or skipped stitch is a weak point in the seam | The whole contact line is bonded, so there is no single thread to break |
| Fabric surface | Needle holes along the seam; the join stiffens | No holes, so the surface keeps its hand and stays soft |
| Changing the material | Re-thread, re-tension and re-test for every fabric | Set three numbers, or swap the pattern roller |
| Thin film and coated fabric | Tends to tear at the stitch line | Amplitude and roller pressure are turned down to suit |
From the crate to the first metre in four steps
Level and power
The frame goes down flat and the table is levelled so the working line is horizontal. Single-phase 220 V, 6 A.
Fit the roller
The pattern roller goes onto the bottom mould and is lined up with the horn. The fixed suspension holds that line from then on.
Set the numbers
Amplitude, weld time and hold time on the generator; speed on the motor control. Write the setting down for the next run.
Run a metre
Feed your own material through on the foot pedal and look at the seam. Adjust once, and the setting is ready for the batch.
Not sure the seam will hold on your material? Send us the fabric — we run it on the machine, then come back with the pattern roller, the settings and a sample of the seam, before you place the order. Ask for a free process test.
Other welding and cutting equipment
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Questions buyers ask before ordering
Will it work on my fabric?
It works on synthetic and non-woven fabrics (polyester, nylon). Send a sample and we will confirm.
Can I order custom roller patterns?
Yes — engraved patterning rollers are made to your design for lace, trim and sealing.
How fast can it run?
Speed is set by material and pattern; we tune it during commissioning for a clean, fray-free seam.
What maintenance does it need?
Keep the rollers clean and the horn tuned; routine checks keep welds consistent.
Send us your fabric and the seam you want
Tell us the material, the width of the seam and the pattern you need. We will come back with the roller, the settings and the machine configuration that gets you there — and we test it on your own material first.
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