Spunbond vs. Meltblown: Key Differences Explained (A Manufacturer's Guide)
In the realm of nonwoven fabrics, the fundamentals are spunbond and meltblown technology-yet their distinction characterizes their application in products ranging from surgical masks to crop covers. As a 25+-year-old leading supplier of Fortune 500 businesses and medical facilities, we have witnessed first-hand how these products fail and budgets get wasted due to improper usage of these materials. This white paper cuts through the jargon, presenting a technical in-depth analysis of spunbond versus meltblown nonwovens based on laboratory data, industry guidelines, and practical application case studies.
Spunbond vs. Meltblown: A Quick Overview
| Factor | Spunbond | Meltblown |
|---|---|---|
| Fiber Diameter | 15–35 microns | 1–5 microns |
| Production Speed | 300–500 m/min | 30–100 m/min |
| Strength | High tensile (20–120 N) | Low tensile (5–15 N) |
| Primary Use | Structural layers | Filtration/barrier layers |
| Cost | 1.50–1.50–3.00/kg | 6.00–6.00–15.00/kg |
Manufacturing of Spunbond and Meltblown
1. Spunbond Nonwoven Process
Polymer Extrusion: Polypropylene pellets melted at 220–250°C
Filament Spinning: Extruded from spinnerets into continuous fibers.
Layering: Fibers scattered randomly into a web by aerodynamic dispersion.
Heat Bonding: Calender rolls (140–160°C) bond fibers together at point of contact
Principal Benefit: Fast production rate of up to 500 m/min for economical bulk rolls.
2. Melting Nonwoven Process
Polymer Extrusion: PP extruded like spunbond.
High-velocity air: Hot 300–500 m/s air blowing on the molten polymer that forms microfiber.
Web Building: Microfiber accumulation on a conveyor belt, fusing with residual heat.
Post-Treatment: Usually laminated or electrostatically charged for electrostatic filtering
Key Benefit: Extremely fine-fiber technology for effective capture of particles (e.g., N95 masks).
Critical Differences Explained
1. Fiber Structure and Properties
Spunbond:
Continuous filaments of equal diameters.
High tensile strength (ASTM D5034: 25–120 N/5cm).
Smooth surface–good for liquid repellency (AATCC 22 rating >4).
Meltblown:
Microfiber with disordered, entangled structure.
Low strength with high surface area (10–100 times spunbond).
Electret charging enhances particle filtration (e.g., 95%+ for PM0.3).
Case Study: A medical supply company blended spunbond (outer) with meltblown (middle) in making Level 3 surgical gowns, which saved material costs by 18% over SMS composites.
2. Material Properties Comparison
| Property | Spunbond | Meltblown |
|---|---|---|
| Basis Weight | 10–150 gsm | 15–200 gsm |
| Air Permeability | 100–500 cfm² | 10–50 cfm² |
| Filtration Efficiency | Blocks >50 μm particles | Blocks >0.3 μm particles |
| Hydrostatic Head | 50–200 cm (waterproof) | 5–20 cm (non-waterproof) |
Lab Note: Meltblown's filtration drops by 30% at 85% humidity unless hydrophobically treated.
3. Applications Breakdown
| Industry | Spunbond Uses | Meltblown Uses |
|---|---|---|
| Medical | Surgical gowns, drapes | N95 masks, filter media |
| Hygiene | Diaper covers, wipes | Sanitary napkin acquisition layers |
| Agriculture | Crop covers, weed control | Seed coating carriers |
| Filtration | HVAC pre-filters | HEPA filters, oil absorbents |
| Automotive | Seat liners, trunk covers | Cabin air filters |
Spunbond + Meltblown: SMS Fabric
SMS (Spunbond-Meltblown-Spunbond) composites leverage both technologies:
Structure:
Outer Spunbond (S): Attributed with strength
Middle Meltblown Filter (M
Inner Spunbond (S): Comfort, skin contact
Applications:
Medical: Isolation gowns, Level 2–4
Hygiene: High-quality topsheet diapers
Cost: 2.50
2.50–5.00/kg, depending on meltblown layer weight.
Trend in the industry: Post-COVID, demand for PPE increased 200% according to EDANA 2022 figures
Cost and production challenges
1. Spunbond Economics
Raw Material: Virgin PP ($1.30/kg) predominates; recycled PP conserves 15% but lowers strength.
Energy consumption: 0.8–1.2 kWh/kg (less for the higher
ROI Case: The packaging firm gained $120,000/annum by making a change from woven PP to 40 gsm spunbond.
2. Meltblown Economics Raw Material: High MFI PP of 35–45 g/10min, which is 20% more expensive than regular PP. Energy Use: 2.5–4.0 kWh/kg (high air pressure demands). COVID Impact: Meltblown prices spiked to 50/kgin2020;nowstabilizedat50/kgin2020;nowstabilizedat8–$15/kg.
Sustainability Comparison
| Factor | Spunbond | Meltblown |
|---|---|---|
| Recyclability | Easily recycled (monomaterial PP) | Harder due to fine fibers |
| Carbon Footprint | 1.8 kg CO2/kg | 3.5 kg CO2/kg |
| Bio-Based Options | Braskem Green PP (sugarcane) | Limited R&D |
Innovation: Our plant now uses 30% post-industrial PP in spunbond, reducing emissions by 22%.
FAQs from Engineers & Buyers
Q: Can meltblown be used alone without spunbond?
A: Rarely-its low strength requires support layers (e.g., spunbond or scrim).
Q: Which has better abrasion resistance?
A: Spunbond-its continuous filaments withstand 5,000+ Taber cycles (ASTM D3884).
Q: How to distinguish them visually?
A: Spunbond is smooth/opaque; meltblown is fibrous/translucent.
Q: Can spunbond provide filtration?
A: Only for large particles (>50 μm). Use meltblown or SMS for submicron filtration.
Technical Checklist for Material Selection
1.Define Requirements:
Filtration requirements? → Melt
Cost sensitivity? → Spunbond.
2.Compatibility Test
Perform air permeability (ASTM D737) and hydrostatic pressure (AATCC 127) tests
3.Verify Certifications
Medical: ISO 13485, FDA 510(k) where applicable
Sustainability: GRS, OEKO-TEX®.
Case Study: One HVAC company lowered filter replacements by 40% when they moved from spunbond to SMS with meltblown.
Why Trust Our Analysis?
Experience of 25+ years in production of 10,000+ tons of spunbond, meltblown, and
These include certifications of ISO 9001, ISO 14001, and BRCGS
Transparency: Third-party test report access through QR codes on rolls of products.
