IF-B90 and IF-BA Bonnell Spring Machines: Make Your Own Spring Units at 60 Percent Less Cost

If you buy Bonnell innerspring units from a supplier, you pay roughly $0.45-0.65 per spring depending on steel gauge and quantity. For a queen mattress using 300 springs, that's $135-195 just for the spring unit. A factory making 500 queen mattresses per month spends $67,500-97,500 per year on innerspring units alone. That's money walking out the door every month — and you have zero control over steel quality, spring consistency, or delivery timing.

By bringing spring production in-house with the IF-B90 coiling machine and IF-BA assembly machine, the per-spring cost drops to roughly $0.18-0.25. The annual saving: $40,000-60,000 per year. The equipment pays for itself in 8-12 months. And you get full control over spring quality, steel sourcing, and production scheduling. If a customer places a rush order, you don't wait for your supplier — you make the springs yourself.

But in-house spring production isn't just about cost savings. It's about quality control. When you buy from a supplier, you're accepting their quality standards — which may change with each batch. In-house production means you control the steel wire source, the spring dimensions, the heat treatment temperature, and the final inspection. Every spring is to your specification.

Infinity Foam Machinery manufactures two machines that form the backbone of Bonnell spring production: the IF-B90 High Speed Computerized Bonnell Spring Coiling Machine and the IF-BA Bonnell Spring Assembling Machine.

IF-B90: High-Speed Spring Coiling at 80 Springs Per Minute

The IF-B90 produces Bonnell springs at 80 springs per minute. Each cycle: the wire is coiled into a spring, knotted at both ends, heat-treated, and collected. The computerized control system maintains consistent spring dimensions across the entire production run. Spring height, coil count, and knot tightness are programmable via the touchscreen panel. The auto-knotting mechanism forms consistent knots at both ends of every spring, eliminating the loose knots that cause springs to separate from the helical wire during mattress assembly.

The IF-B90 handles wire diameters from 1.2mm to 2.4mm and produces spring heights from 80mm to 200mm. The heat treatment system uses induction heating for precise tempering, ensuring every spring returns to its original shape after compression — no weak springs, no mattress sagging. The automatic collection system organizes finished springs for transfer to the assembly station. One operator can manage two IF-B90 machines simultaneously, as the coiling cycle is fully automated. A factory we worked with in Vietnam runs three IF-B90 machines with a single operator, producing 240 springs per minute — enough for 48 queen mattresses per hour.

Production output: A single IF-B90 running 8 hours produces approximately 38,400 springs, enough for 128 queen-size mattresses (at 300 springs each). A factory producing 500 mattresses per month needs roughly 4 days of IF-B90 operation, with the remaining days available for spare parts production or maintenance.

IF-BA: Assembly That Converts Springs Into Finished Mattress Units

The IF-BA Bonnell Spring Assembling Machine takes coiled springs from the IF-B90 and assembles them into complete innerspring units. It positions each spring, applies helical wires to interconnect the coils, and forms the border wire around the perimeter. The result is a finished Bonnell innerspring unit ready for mattress fabrication — with consistent spring spacing, proper helical wire tension, and clean border wire formation.

The automatic assembly process ensures consistent spring spacing and helical wire tension across the entire unit. Manual assembly typically produces 30-40 units per shift with 4-5 workers. The IF-BA produces 80-100 units per shift with a single operator. For a factory producing 500 mattresses per month, that's a reduction from 12-16 assembly workers to 5-6, saving $3,000-4,000 per month in labor costs. The automatic border wire former handles wire diameters from 3.5mm to 5.0mm, accommodating different mattress sizes and firmness requirements.

The combination of IF-B90 and IF-BA creates a complete in-house spring production line. The IF-B90 coils the springs, the IF-BA assembles them into units. The two machines together take up approximately 45 square meters of floor space — about the same as two shipping containers. A complete production line from wire to finished innerspring unit can be operational within 2 weeks of delivery.

IF-PPA: Upgrade to Pocket Springs for Premium Lines

The IF-PPA Fully Automatic High Speed Pocket Spring Assembly is the recommended upgrade path when you're ready to add pocket spring production. It produces individually wrapped pocket springs at high speed, assembled into finished pocket spring units. Pocket springs command a 30-50% price premium over Bonnell in most mattress markets.

The IF-PPA integrates seamlessly with your existing Bonnell production: it uses the same steel wire, the same factory floor space, and the same operator skill level. The dual capability coiling + pocket spring makes your factory more versatile and opens higher-margin product lines. Many of our customers start with Bonnell production and add pocket spring capability within 12-18 months as their mattress line expands.

Spring Production Comparison

Three Paths to In-House Spring Production

Path 1: IF-B90 only. Start by producing springs in bulk. Store them and assemble manually. Lowest investment, good for factories producing under 300 mattresses per month.

Path 2: IF-B90 + IF-BA. Full Bonnell production line. Coil and assemble in-house. Best for 300-1,000 mattresses per month. Saves 60% vs supplier cost.

Path 3: Add IF-PPA. Expand into pocket springs. Opens premium mattress lines at 30-50% higher margins. Ideal for factories producing 500+ mattresses per month with room to grow.