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A Complete Guide to Spring Core Manufacturing: From Wire to Mattress Core |NAIGU

Explore the complete process of spring core manufacturing—from steel wire to finished mattress spring units. Learn how modern machinery improves quality, efficiency, and cost savings.

Jul 9th,2025 129 Lượt xem

Spring core manufacturing is at the heart of modern mattress production. From high-carbon steel wire to a durable and supportive spring unit, the entire process requires precision engineering and the right machinery. In this guide, we'll walk you through every step of spring core manufacturing and how automated solutions can improve productivity, consistency, and cost-efficiency in your mattress factory.

1. Wire Preparation: The Foundation of a Quality Spring

The process begins with high-quality steel wire, typically made of high-carbon or tempered steel. Wire preparation involves:

Descaling and Cleaning: To remove any rust, scale, or contaminants.
Straightening: Ensuring uniformity in diameter and tensile strength.
Coiling: The wire is formed into coils using CNC-controlled coiling machines.

✅ Recommended machine: Wire Coiling Machine for Mattress Springs

2. Spring Coiling and Knotting

The coiled wire is then fed into a spring coiling machine, where it is shaped into Bonnell, Offset, or Pocket springs, depending on the mattress design.

Key features:

Consistent coil height
Precise pitch control
Automatic knotting or welding at the spring ends

3. Heat Treatment for Spring Durability

To ensure each spring retains its shape and elasticity, heat treatment is applied after coiling:

Tempering ovens evenly apply heat to relieve internal stress and improve fatigue resistance.
Some systems integrate online heat treatment directly into the spring production line.

🔥 Pro tip: Proper tempering extends the lifespan of your mattress springs and reduces warranty claims.

4. Assembly into Spring Units

Individual springs are assembled into full spring cores using either:

Helical wire binding (for Bonnell/Offset units)
Ultrasonic welding (for pocket spring units)

This process is often done using fully automated spring assembly lines, which combine speed, accuracy, and reduced labor costs.

✅ Recommended machine: Automatic Spring Unit Assembly Line

5. Border Wire Frame and Edge Support

A border wire is applied to reinforce the spring unit’s perimeter, providing:

Structural integrity
Edge support during mattress use
Better performance in roll-packing

Automated border welding systems ensure secure and consistent attachment.

6. Quality Inspection and Compression Testing

Before the spring core moves to upholstery, it undergoes:

Visual and dimensional checks
Bounce and compression testing
Random unit load testing for consistency

Some manufacturers use inline inspection systems to detect defects in real time.

7. Optional: Pre-Compression or Zoning

For high-end mattresses, spring units can be customized with:

Zoning: Varying coil counts or wire gauges for ergonomic support
Pre-compression: To create firmer zones or softer comfort layers

✅ This adds value and differentiation in competitive markets.

8. Ready for Upholstery & Final Assembly

Once the spring core is completed and passes inspection, it is sent to the upholstery section where foam, fabric, and edge supports are added. For roll-packed mattresses, compatibility with compression and roll packing machines is crucial.