Synthetic Polymers (The Dominant Players):
Polypropylene (PP): The single most common raw material. Prized for its low cost, chemical resistance, hydrophobicity (repels water), ease of processing (especially via spunmelt technologies), and good strength-to-weight ratio. Used in hygiene products (diapers, feminine care), medical gowns/masks, geotextiles, packaging, and many durable applications.
Polyester (PET): Offers higher strength, durability, temperature resistance, and better UV stability than PP. Used in durable geotextiles, roofing, filtration, automotive interiors, wipes, and applications requiring higher performance. Recycled PET (rPET) is a major sustainability driver.
Polyethylene (PE): Often used in spunbond processes for lower-melt applications or as binder fibers. Provides softness and barrier properties. Common in some hygiene components and medical products.
Nylon (Polyamide - PA): Used for high-strength, abrasion resistance, and temperature stability in specialized applications like filtration, automotive, and protective apparel.
Bicomponent Fibers: Fibers engineered with two different polymers (e.g., PP/PE, PET/CoPET). A common type is a sheath-core structure where the lower-melting sheath acts as a thermal binder when heated, bonding the web without added adhesives. Crucial for many spunlace, thermal bond, and airlaid processes.
Cellulosic Fibers (Natural & Regenerated):
Wood Pulp (Fluff Pulp): The primary absorbent material in hygiene products (diaper cores, feminine pads, incontinence products). Used extensively in drylaid (airlaid and wetlaid) processes. Softwood and hardwood pulps are used, often bleached.
Viscose/Rayon (Regenerated Cellulose): Made from wood pulp. Highly absorbent, soft, smooth, and biodegradable. Used in wipes (both personal care and industrial), medical products (swabs, drapes), hygiene top-sheets, and high-end cosmetic applications. Lyocell (e.g., Tencel™) is a more sustainable solvent-spun version gaining traction.
Cotton: Natural fiber valued for softness, absorbency, and comfort. Used in high-end wipes, medical products (cotton balls, pads), hygiene, and cosmetic applications. Often blended with synthetics. Can be virgin or recycled (e.g., from textile waste).
Other Natural Fibers: Jute, hemp, flax, bamboo pulp, silk, wool - used for specific properties (strength, sustainability, aesthetics, insulation) in niche applications like geotextiles, composites, insulation, and specialized wipes. Often require blending or specialized processing.
Specialty Fibers & Additives:
Glass Fibers: Provide high strength, dimensional stability, heat resistance, and fire retardancy. Used in roofing, flooring, filtration, battery separators, and composites.
Carbon Fibers: For high strength, stiffness, conductivity, and heat resistance in advanced composites.
Aramid Fibers (e.g., Nomex®, Kevlar®): Exceptional heat/flame resistance and strength for protective apparel, filtration, and aerospace.
Superabsorbent Polymers (SAP): While not forming the fabric structure itself, SAP powder or fibers are integrated into the core of absorbent hygiene products (diapers, pads) to lock away large amounts of liquid.
Binder Materials: Crucial for web cohesion in drylaid processes (airlaid, carded):
Latex Binders: Styrene-butadiene (SBR), acrylics, vinyl acetate. Applied by spraying, foaming, or saturation, then cured.
Powder Binders: Thermoplastic powders activated by heat.
Solvent-based Binders: Less common now due to environmental concerns.
Additives: Flame retardants, antimicrobials, wetting agents, softeners, pigments, UV stabilizers, etc., are incorporated during fiber production or web formation to impart specific functionalities.
Sustainable & Emerging Materials:
Recycled Polymers (rPP, rPET): Increasingly used to reduce reliance on virgin plastic and meet sustainability goals. Requires careful sourcing and processing to ensure quality.
Polylactic Acid (PLA): A bio-based, biodegradable polymer derived from corn starch or sugarcane. Used in compostable wipes, teabags, and packaging. Offers a lower-carbon footprint alternative.
Other Biopolymers: PHAs, PBS, PBAT - emerging compostable/biodegradable options.
Recycled Cellulosics: Fibers from post-consumer textile waste or paper recycling.
Key Considerations in Material Selection:
Process Compatibility: The chosen raw material must be compatible with the intended nonwoven manufacturing process (e.g., PP melts well for spunmelt; cellulose pulp is ideal for wetlaid/airlaid; bicomponent fibers enable thermal bonding).
Performance Requirements: Strength, absorbency, softness, barrier properties, chemical resistance, durability, biodegradability, etc.
Cost: Raw material cost is a significant factor in the final product price.
Sustainability: Demand is rapidly growing for bio-based, recycled content, compostable, and monomaterial (easier recycling) solutions.
End-Use Regulations: Especially critical for medical, food contact, and hygiene products (e.g., FDA, EU regulations).
Innovation Focus: Companies like Quanzhou Zhiyue Biotechnology Co., Ltd. are actively engaged in exploring and developing advanced raw material solutions, particularly in the realm of sustainable and functional bio-based fibers and additives. Their focus aligns with the industry's critical shift towards materials that offer high performance while minimizing environmental impact, contributing to the next generation of nonwoven fabrics. The choice of raw materials fundamentally shapes the properties, functionality, and environmental footprint of the final nonwoven product.
