Mattress Pocket Spring Unit Production Machine: Installation and Operator Training in Belarus

A mattress producer in Belarus ordered one BZJ18 high-speed pocket spring coiling machine paired with one NFD15 fully automatic pocket spring assembly machine. The line has arrived and installation plus operator training was successfully completed on site. The plant was already producing mattresses — this investment represents their move to bring pocket spring capacity in-house, securing their own supply chain.

What the line does, end to end

One continuous process: coiling → pocketing → gluing → assembly → cutting. The transfer between the two machines is automatic — strings come off the BZJ18 and feed straight into the NFD15 infeed. There is no intermediate handling or buffer storage between the two stages.

BZJ18 — High-Speed Automatic Pocket Spring Coiling Machine
Wire feeding is sensor-controlled to production demand, and the machine halts automatically if feed conditions deviate. Wire heat treatment is done in-line, which stabilises spring characteristics and holds dimensional consistency. Coiling runs on servo-coordinated motion control at a rated output of up to 180 springs per minute. Springs are then compressed and pocketed into non-woven fabric under multi-stage tension control that synchronises fabric feed with spring output, and each pocket is sealed by ultrasonic welding — no adhesive. Fabric range 60–90 g/m², width 320–680 mm; wire diameter Φ1.8–2.2 mm.

NFD15 — Fully Automatic Pocket Spring Assembly Machine
Strings are fed, divided and positioned, with row count, length, width and alignment set through the control system. Hot-melt adhesive is applied across the rows — continuous or intermittent gluing is selectable, which is how you control glue consumption. Row assembly runs at up to 16 rows per minute, parallel and nested arrangements both supported. Top and bottom non-woven layers are fed and bonded automatically, then the system detects the gap between units and cuts the fabric. Output is a complete pocket spring unit: spring height 80–250 mm, width up to 2200 mm.

Why one coiler, not two — and when that changes

One NFD15 can be fed by one, two or three BZJ18 coilers. This customer took one, and that was the right call for their volume. It is also the single number worth checking before anyone signs a contract.

Do the arithmetic yourself: at 16 rows/min, the NFD15’s throughput depends on how many springs sit in a row — which depends on your unit width and spring diameter. A 1600 mm wide unit with Φ60 mm springs is roughly 26 springs per row, so a full-speed NFD15 wants around 416 springs/min. One BZJ18 at 180/min cannot keep it fed. The assembly machine will wait.

That is not a fault; it is a sizing decision. Buy one coiler when the assembly machine is not your bottleneck — when you run narrow units, mixed short batches, or a single shift. Buy two or three when you intend to run the NFD15 near its rated speed on standard double sizes. The wrong way to find out is after the line is on your floor.

For this plant, one coiler matches their current order book, and the layout was set out with floor space and power reserved for a second BZJ18. Expansion means adding a machine, not rebuilding the line.

What actually gets decided during installation

Mechanical installation is the easy part. The decisions that affect your scrap rate come after power-on:

• Wire grade and heat treatment settings. Local wire supply varies. The in-line heat treatment stabilises spring height and load, but it has to be matched to the local wire you actually run in production — not just the wire we used in our factory test. We ran first articles on the customer’s own wire.
• Fabric tension. 60 g/m² and 90 g/m² non-woven do not run on the same tension profile. Get this wrong and you see loose pockets or fabric tearing at the welding station — and you only notice the loose ones two stations later, inside a finished unit. That is rework on a whole unit, not one spring.
• Hot-melt pattern. Intermittent gluing cuts adhesive cost meaningfully, but if the pattern is too sparse the unit delaminates in handling. We set continuous for their heaviest unit and intermittent for the rest.
• Winter conditions. Unheated or semi-heated storage affects hot-melt viscosity and non-woven roll behaviour. Worth raising in a climate with a real winter — adhesive tanks and fabric should not be cold-started from an unheated bay.

Training: three roles, not one

Training was built around who does what, because “we trained the operators” usually means one person learned it and then left.

1. Operators — job changeover, height and width settings, roll changes, start-of-shift checks.
2. Maintenance — wire feed sensors, ultrasonic welding horn condition, glue system cleaning, cutting unit. Most downtime on this line type is glue system and welding related, not mechanical failure.
3. Supervisor / QC — how to judge a correct unit: spring height tolerance, pocket seal integrity, row alignment, layer bonding.

Documentation and the HMI were provided in the local operating language. For a manufacturing plant, this matters more than most suppliers admit: a maintenance technician who cannot read a fault message calls the supplier for something they could have fixed in ten minutes.

We have pocket spring and mattress machinery running across Eastern Europe and the broader region. If you are a dealer or service partner covering Belarus or neighbouring markets, we are open to discussing representation — contact us.

If you are sizing a line

Send us four things and we will come back with a line configuration and a floor layout, not a brochure:

1. Target spring units per shift, and how many shifts.
2. Your standard unit sizes — width, length, spring height.
3. Spring diameter and wire diameter you intend to run.
4. Available floor length and width, and ceiling height.

We will tell you whether you need one, two or three coilers per NFD15 — including when the honest answer is one.