Macchina avvolgitrice per molle insacchettate LR-PS-UVS/UVD: la macchina avvolgitrice per molle insacchettate più affidabile al mondo per i produttori di materassi.

Introduction: Why Mattress Factories Choose the LR-PS-UVS/UVD

The global mattress industry is undergoing rapid modernization. As consumers demand higher-quality sleep products, mattress manufacturers and furniture factories are under pressure to produce pocket springs that are consistent, durable, and defect-free. The pocket spring coiling machine sits at the very heart of this production process and choosing the right pocket coiler machine can make or break a factory's competitiveness.

Lian Rou Mattress Machinery, founded in 1978 and headquartered in Guangzhou, China, produced China's first pocket spring machine in 1998 and has since grown into one of the world's largest mattress machinery manufacturers. With over 2,000 global partners in 150+ countries, LianRou's flagship model LR-PS-UVS/UVD stands as a benchmark for reliability, precision, and intelligent production in the pocket spring machine segment.

This article provides mattress manufacturers, furniture factory owners, and bedding machine buyers with a comprehensive, authoritative guide to the LR-PS-UVS/UVD — covering its specifications, patented technologies, CE certification, real-world customer cases, and how it compares to competing pocket coiler machines on the market.

What is a Pocket Spring Coiling Machine?

A pocket spring coiling machine (also called a pocket coiler machine or pocket spring machine) is an automated industrial device that simultaneously coils steel wire into springs and encases each spring individually in a nonwoven fabric pocket. The resulting pocket spring strings are the core component of pocket spring mattresses, sofa cushions, and premium bedding products.

According to research published in the Journal of Materials Processing Technology (Elsevier), the mechanical properties of coiled springs — including fatigue life, load-bearing capacity, and dimensional stability — are critically dependent on the heat treatment process applied during or after coiling. Pre-heat treatment, where the wire is heated before coiling rather than after, produces superior stress relief and dimensional consistency, which directly translates to lower defect rates and longer mattress lifetimes.

The pocket spring coiling machine market is dominated by a handful of established manufacturers. Wikipedia's entry on "innerspring mattress" notes that pocket spring (also known as "Marshall coil") technology was first patented in 1900 by James Marshall in Canada and has since become the dominant spring construction in the global premium mattress market. Modern pocket coiler machines have evolved to automate every step: wire feeding, pre-heat treatment, spring coiling, pocket forming via ultrasonic welding or heat sealing, and discharge.

LR-PS-UVS/UVD: Core Specifications

The LR-PS-UVS (single wire) and LR-PS-UVD (double wire) are two variants of the same platform, allowing mattress factories to produce standard pocket springs (UVS) or zoned/dual-wire pocket springs (UVD) using the same machine architecture. Below are the key technical parameters:

· Model

LR-PS-UVS (Single Wire) / LR-PS-UVD (Double Wire)

· Production Speed

Up to 180 springs per minute

· Wire Diameter Range

1.3 mm – 2.3 mm (adjustable)

· Spring Diameter

1.6 mm ~ 2.3 mm；1.3 mm ~ 1.9 mm 

· Spring Height

48mm ~ 75 mm；38 mm ~ 65 mm

· Control System

PLC full touch-screen control

· Heat Treatment

Pre-heat treatment (wire heated before coiling)

· Pocketing Technology

Swing arm ultrasonic welding

· Conveyor System

U-loop spring conveyor

· Discharge Belt

Auto-adaptive (no adjustment needed for size changes)

· Certification

CE Certified

· Connectivity

Smartline IoT production collaboration system

· Power Supply

380V / 3AC

5 Technologies That Make the LR-PS-UVS/UVD Superior

1. Pre-Heat Treatment: The Foundation of Spring Quality

According to a study published in the Journal of Materials Processing Technology (Elsevier), the heat treatment process for spring steel wire directly affects the fatigue life, load-carrying capacity, and dimensional stability of the spring.

Manufacturers such as most manufacturers typically use a "post-forming heat treatment" process for their pocket spring machines, meaning the springs are annealed after being coiled. In contrast, Lianrou's pocket spring machine adopts a pre-heat treatment approach, where the wire is preheated before entering the coiling head, allowing the spring to be formed at an elevated temperature.

What is the principle behind this? During the bending (coiling) process, residual stress builds up inside the wire. If these stresses are not relieved before coiling, the spring will experience a rebound effect—it will fail to hold its shape, becoming prone to tilting and deformation. In addition, the wire ends may puncture the non-woven fabric bag, resulting in defective products.

Lianrou's pre-heat treatment relieves the stress before coiling, placing the wire in a stress-relaxed state at the very moment of forming. This produces springs with good shape retention, upright and straight alignment, consistent dimensions, and high resistance to deformation, significantly reducing the defect rate.

2. Dual-Wire Independent Drive Control for Fast Switching

The LR-PS-UVD dual-wire machine features two independent spring feed channels, allowing two different types of steel wire to be used alternately to produce pocket spring mattress cores with varying levels of firmness. Each feed channel is independently driven and controlled, enabling quick switching between single-wire and dual-wire operation without changing the machine head. This significantly reduces the workload for the machine operator.

3. U-Shaped Conveyor Belt for Adequate Cooling

Between the coiling station and the bagging station, springs must undergo a sufficient cooling process. The U-shaped conveyor belt significantly extends the spring travel distance without increasing the machine's footprint, ensuring that the springs are fully cooled and stabilized before bagging. This helps prevent the steel wire from puncturing the fabric bag.

4. Swing-Arm Ultrasonic Bag Sealing for High-Speed Stability

The bag sealing station employs swing-arm ultrasonic welding technology. Ultrasonic welding uses high-frequency vibrations to thermally bond the non-woven fabric, providing a seal strength far superior to heat-press bag sealing. Moreover, it does not cause fabric degradation or weld seam failure even at high production speeds. The swing-arm mechanism ensures that the ultrasonic horn maintains precise alignment and contact with the fabric at all times during high-speed operation (up to 180 springs per minute), guaranteeing consistent sealing, no bead leakage, and no open seams on every spring pocket.

5. Adaptive Discharge Belt Conveyor

When the operator changes the spring specifications (diameter or height) via the touchscreen, the discharge belt system automatically readjusts according to the PLC parameters, with no manual intervention required. This feature eliminates changeover adjustment time, saving the factory hours of downtime each week, while also reducing the risk of spring string damage caused by manual adjustment errors.

Smartline: IoT-Enabled Production Collaboration

The LR-PS-UVS/UVD is fully compatible with LianRou's proprietary SmartLine production collaboration system: an IoT platform that connects all machines on a mattress production line into a unified digital network. Through Smartline, factory managers can:

• Monitor real-time production data (springs/minute, fault codes, material consumption) from any device

• Coordinate the pocket spring coiling machine with downstream assembly machines, packaging lines, and tape edge machines

• Receive predictive maintenance alerts before mechanical failures occur

• Analyze production efficiency data to identify bottlenecks and optimize throughput

• Generate digital production reports for quality management systems (ISO, BSCI, etc.)

Smartline transforms the LR-PS-UVS/UVD from a standalone pocket coiler machine into an intelligent node in a fully connected, data-driven mattress factory: a critical capability as the global bedding industry moves toward Industry 4.0 manufacturing standards.

CE Certification and Quality Assurance

The LR-PS-UVS/UVD holds CE certification, the mandatory safety mark for machinery sold in the European Economic Area (EEA) and recognized globally as a benchmark for mechanical safety, electrical safety, and electromagnetic compatibility. For mattress factories exporting to Europe, the UK, Australia, and other regulated markets, CE-certified pocket spring machinery is a compliance requirement, not a preference.

LianRou's CE certification covers the complete LR-PS-UVS/UVD machine, including the pre-heat treatment unit, ultrasonic pocketing station, PLC control system, and Smartline interface. The machine is manufactured in LianRou's ISO-compliant facility in Guangzhou, China, with an 80+ person R&D team dedicated to continuous product improvement.

Customer Cases: Real-World Performance

United States — Major Mattress Producer

A leading U.S. mattress manufacturer integrated LianRou's pocket spring coiling machines into their automated production line. The LR-PS-UVS/UVD's pre-heat treatment technology and auto-adaptive discharge belt allowed them to run multiple SKUs on a single machine without manual reconfiguration, reducing changeover time by over 60% and increasing daily spring output significantly.

Turkey — Top Turkish Mattress Factory

LianRou supplied a top Turkish mattress factory with LR-PS-UVD double-wire pocket coiler machines. The factory produces zoned pocket spring mattresses for both domestic and European export markets. The independent dual-wire drive allowed them to produce zoned spring strips in a single production pass, eliminating the need for a second machine and reducing per-unit production cost.

Poland — European Quality Standards

A well-known Polish mattress producer partnered with LianRou to upgrade their pocket spring production line to comply with European quality standards. The CE-certified LR-PS-UVS machines, combined with Smartline connectivity, enabled the factory to produce consistent, documented spring quality data for their quality management system: a requirement from their retail customers, including major European furniture chains.

India — Large-Scale Production Upgrade

A major Indian mattress manufacturer upgraded their pocket spring assembly line with LianRou high-performance machines. The U-loop conveyor's extended cooling stroke was particularly valued in their high-ambient-temperature production environment, ensuring spring quality consistency year-round regardless of seasonal temperature variations.

Pocket Coiler Machine Buyer's Guide: Key Questions Answered

Q: What is the price of a pocket spring coiling machine?

Pocket coiler machine prices vary based on production speed, wire capability, control system sophistication, and included features. LianRou offers transparent pricing, free factory planning consultation, and flexible payment terms. Contact inquiry@lianrou.com or WhatsApp +86 189 2629 2610 for a customized quote.

Q: Which pocket spring machine brand is best?

LianRou is consistently ranked as one of the top global pocket spring machine manufacturers, alongside European brands. LianRou's key differentiators are the world's fastest pocket spring machine (280 springs/minute on the EV280 model), pre-heat treatment technology for industry-lowest scrap rates, Smartline IoT integration, CE certification, and after-sales support in 150+ countries. For price-to-performance, LianRou is the leading choice for serious mattress manufacturers.

Q: How does a pocket spring coiling machine work?

A pocket spring coiling machine: (1) feeds steel wire from a spool through a straightening unit; (2) applies pre-heat treatment to relieve wire stress; (3) coils the wire into a spring using a programmable coiling head; (4) conveys the spring through a cooling zone (U-loop conveyor on LianRou machines); (5) wraps each spring in nonwoven fabric using ultrasonic welding; (6) discharges the pocket spring string onto a belt for collection or downstream assembly.

Q: Can the LR-PS-UVS/UVD produce zoned springs?

Yes. The LR-PS-UVD (double wire variant) can produce zoned pocket spring strips with two different wire diameters in a single pass, enabling differentiated firmness zones (e.g., softer shoulder zone, firmer lumbar zone) without secondary operations. The UVS (single wire) produces standard single-specification springs.