Spunbonded Nonwoven Fabric Making Machine for Nonwoven Bag Production

Simplicity with lower Investment Risk:The machine layout is simpler and Ideal for small to medium-sized enterprises.
Lower Capital Cost: Significantly cheaper to purchase and install.This makes it the entry-point technology for many manufacturers.
Easier Operation and Maintenance: With only one spinning beam and drawing unit, the operational parameters are simpler to control.
High Production Efficiency: Its designed for continuous, high-speed production, leading to high output and excellent uptime.
Good Uniformity: Advanced Spinning systems can produce fabric with excellent cross-direction (CD) and machine-direction (MD)
uniformity.

Polymer → Extrusion → Spinning → Drawing → Web Formation → Bonding → Winding

1. Polymer Feeding & Extrusion System

This is the starting point where raw material is prepared and melted.

• Hopper & Dosing System: Granules or chips of polymer (e.g., PP, PET) are stored and precisely metered.

• Extruder: A large screw rotates inside a heated barrel to melt the polymer uniformly.

• Melt Pump (Metering Pump): A precision gear pump that ensures a constant, pulse-free flow of molten polymer to the spinneret, critical for filament uniformity.

2. Spinning Beam & Spinneret Assembly

This is the heart of filament formation.

• Spinneret: Located at the bottom of the spinning beam. It's a complex, heated block containing final filters and a thin plate (the spinneret) drilled with hundreds to thousands of precise holes. The molten polymer is forced through these holes to form a curtain of fine, molten filaments.

• Spinning Beam: A large, thermally controlled manifold that distributes the polymer melt evenly from the extruder to all parts of the spinneret.

3. Filament Quenching System

This section cools and stretches the filaments to their final fine diameter.

• Quenching Chamber: Located directly below the spinneret. Cross-flow cooling air (conditioned for precise temperature and humidity) is blown across the filaments to solidify them.

• Drawing Unit: The most critical for web quality. High-speed drawing air is introduced here to accelerate and stretch (attenuate) the filaments.

4. Web Formation System

This section disperses the filaments and deposits them onto a moving belt to form a uniform web.

• Diffuser: Located at the outlet of the drawing unit. It slows down and spreads out the high-velocity filament/air stream. Its design is crucial for eliminating "ropiness" and achieving random filament distribution.

• Forming Belt: A continuous, permeable conveyor belt (often a wire mesh) moving in a horizontal or inclined plane. The filaments are randomly laid onto it by suction from underneath, forming a coherent but unbonded web (batting).

• Forming Chamber/Box: The enclosure where the web is formed, maintaining controlled air flow.

• Suction Units: Located under the forming belt to remove process air and stabilize the web.

5. Bonding System

This is where the web gains its mechanical strength and integrity. There are two primary types, often used in combination.

• Thermal Bonding (Calendering): The most common method for spunbond.

  • Calender: A pair of heated steel rollers, one engraved and one smooth.

  • Engraved Roll: Features a specific point-bond pattern (e.g., diamond, square). Under heat and pressure, the filaments are fused at these bond points.

6. Winding & Finishing Section

The final stage where the finished fabric is prepared for shipment.

• Winder (Turret Winder): Automatically winds the fabric into large rolls (jumbo rolls). Features automatic cutting and transfer to start a new roll without stopping the line.

• Edge Trimmers & Slitters: Trim the selvages and slit the wide fabric into narrower rolls if required.