PRODUCT DETAIL

7D 64mm Hollow Conjugate Siliconized Virgin Fiber: From Extrusion to Application

In the modern high-precision textile market, the quality of your raw materials defines your brand’s longevity. 7D 64mm HCS Virgin Polyester Staple Fiber is widely considered the “industry standard” for premium filling due to its perfect balance of softness, support, and durability. Unlike recycled variants, Virgin HCS offers absolute purity and molecular consistency, ensuring a long-lasting, hypoallergenic product that meets the stringent requirements of global export markets.

At VNPOLYFIBER, we support your sourcing by providing the best QC team and expertise in the supply chain across Vietnam, China, Malaysia, Thailand, and Indonesia. This guide provides a deep-dive into the manufacturing excellence and strategic applications of this essential fiber.

1. The Engineering: The 4-Stage Manufacturing Process

The production of high-tenacity virgin polyester is a sophisticated sequence of chemical and mechanical events performed under strict temperature and pressure controls.

Phase 1: High-Purity Polymerization

Unlike recycled fiber, which starts with plastic waste, Virgin PSF begins with high-purity PTA (Purified Terephthalic Acid) and MEG (Monoethylene Glycol). These raw materials are polymerized at high temperatures to create long, unbroken molecular chains.

• Why it matters: This high molecular weight is what gives virgin fiber its superior tenacity (breaking strength) compared to recycled variants. In 2026, this durability is essential for products that undergo industrial laundering.

Phase 2: Hollow Extrusion & Heat Management

The molten polymer is forced through specialized spinnerets. These spinnerets are designed with a specific geometry to create a continuous void in the center of each filament.

• Thermal Intelligence: This hollow core traps air, providing a thermal barrier that makes the fiber 20% warmer and significantly lighter than solid polyester. For the end-user, this means warmth without the heavy weight of traditional materials.

Phase 3: 3D Conjugate Crimping (Mechanical Memory)

After extrusion, the fiber undergoes a “Conjugate” treatment. This involves a differential cooling process that causes the fiber to curl into a three-dimensional spiral.

• Omni-directional Resilience: Unlike standard 2D zig-zag crimps, the 3D spiral allows the fiber to act like a spring. It can be compressed from any angle and will bounce back to its original volume, ensuring the “fill power” of pillows and cushions stays consistent for years.

Phase 4: Precision Siliconization and Cut

The final stage involves applying a premium silicone emulsion to the fiber surface. This coating creates a “Slick” finish, allowing fibers to slide past one another without friction. Finally, the filaments are cut into the industry-standard 64mm length, optimized for high-speed industrial carding and blowing machines.

2. Strategic Advantages: The “Virgin” Difference

Choosing Virgin HCS over recycled materials is a strategic choice for brands focusing on the luxury, medical, or high-end hospitality sectors.

• Pristine Optical Clarity: Virgin fiber provides an “Optical White” finish. This is essential for high-end white bedding where even a slight yellow or grey tint (common in low-grade recycled fiber) is unacceptable.

• Dimensional Stability: It possesses a resilience that natural fibers lack. Our 7D 64mm HCS neither stretches nor shrinks, ensuring your final product—whether a luxury comforter or a sofa backrest—retains its original dimensions.

• Hypoallergenic Purity: Free from post-consumer contaminants, virgin fiber is the safest choice for baby toys, medical-grade padding, and sensitive-skin bedding.

• Moisture and Odor Control: Polyester is naturally hydrophobic. It repels moisture, which inhibits the growth of fungus, mold, and bacteria. At VNPOLYFIBER, we ensure our fiber’s finish helps eliminate bad odors for a more hygienic consumer experience.

3. Global Supply Chain Intelligence

Managing a supply chain in 2026 requires more than just a low price; it requires geographical resilience. VNPOLYFIBER leverages a multi-country network to protect your production from local disruptions:

• Vietnam: The ESG and trade-neutral hub with favorable FTAs for the EU and USA.

• China: The laboratory of the world, providing massive scale and high-tech modifications.

• Thailand & Indonesia: Strategic hubs for automotive-grade and high-tenacity industrial fibers.

• Malaysia: The center for luxury hospitality-grade fiber with high-automation standards.

4. Key Applications: Why 7D 64mm?

The 7 Denier (7D) thickness is the “Goldilocks” of the industry—it is neither too soft (like 3D) nor too stiff (like 15D).

Premium Bedding & Hospitality

7D 64mm Virgin HCS is the definitive choice for Luxury Hotel Pillows. It provides a luxurious “feather touch” while being durable enough to withstand the repeated compression of a high-turnover hotel environment.

Furniture & Upholstery

For Sofa Backrests and Decorative Cushions, this fiber provides the “soft sink-in” feel that consumers associate with high-end furniture. Its 3D memory prevents the “flattening” that occurs with lower-grade fills.

Industrial Non-Wovens

Beyond filling, 7D fibers are fabricated into non-woven fabrics through compression. They are used in Automotive Sound Insulation and seat padding for their moisture-wicking properties and lightweight thermal efficiency.

5. The VNPOLYFIBER QC Commitment

We don’t just supply fiber; we provide peace of mind. Our best-in-class QC team performs rigorous checks on:

1. Denier Accuracy: Verifying thickness (±0.7) for consistent hand-feel.

2. Oil Content: Ensuring the correct percentage (0.5% ±0.05%) for optimal machine processing.

3. Crimp Frequency: Checking for 3–5 crimps per cm to guarantee loft.

We aim to serve one customer 1,000 times. Whether you are sourcing from Vietnam or China, VNPOLYFIBER ensures your technical specs are met with 100% transparency.

Conclusion

7D 64mm Virgin Hollow Conjugate Siliconized Fiber is the foundation of high-quality comfort. By investing in virgin purity and HCS engineering, brands can deliver products that are technically superior, hypoallergenic, and incredibly durable. Partner with VNPOLYFIBER today to orchestrate a resilient, high-quality Asian supply chain.

Technical Parameter

How to Choose the Right Denier for Your Production

Selecting the correct Denier is the most critical decision in fiber manufacturing. It determines the softness, strength, and “hand-feel” of your final product. Based on our latest technical specifications, here is a guide to choosing the perfect fiber for your industry.

1. Micro-Fibers (0.7D – 1.2D): The Premium Touch

These ultra-fine fibers are designed for products that require a luxurious, soft texture.

• Best For: Premium fleece, high-end cleaning cloths, and thermal bonding applications.

• Key Benefit: Provides a “silk-like” feel while maintaining excellent warmth-to-weight ratios.

2. Apparel & Performance Grades (1.4D – 3D)

This range is the “standard” for the clothing industry, balancing durability with comfort.

• Best For: Sportswear, underwear, and casual wear.

• Specialty Options:

  • 1.4D Solid: Ideal for Flame Retardant (FR) clothing textiles.

  • 1.5D – 3D Dope Dyed Black: Perfect for non-woven fabrics and dark apparel.

  • Anti-Pilling: Designed specifically to prevent “fuzz balls” on activewear.

3. Mid-Range Support (4D – 7D)

The “sweet spot” for items that need to be soft but also hold their shape.

• Best For: High-end bedding, thermal socks (Bamboo Charcoal), and furniture arm-padding.

• Key Benefit: Often available in Hollow Conjugate (7D) for better “spring-back” memory in cushions.

4. Industrial Heavyweights (8D – 15D)

These thick, high-tenacity fibers are built for maximum volume, structural support, and durability.

• Best For: Furniture cushions, mattress padding, toy stuffing (High Void Conjugate), and resin bonding.

• Key Benefit: The 15D hollow structure provides massive filling power and high resilience for heavy daily use.

Quick Reference: End-Use Matrix

Solid vs. Hollow vs. Conjugate: Choosing the Right Fiber Section

In the non-woven and textile industries, the “cross-section” of a fiber is just as important as its thickness. Whether you are producing high-density filters or high-loft cushions, the internal structure of the fiber determines how the final product performs.

1. Solid Cross-Section: Strength & Density

Solid fibers are continuous and dense, providing maximum structural integrity.

• How it works: These fibers have a completely filled core, making them heavier and more durable than hollow versions.

• Best For: * Non-woven Interlinings: Provides the necessary stiffness for garment structures.

  • Needle-punching: Withstands the mechanical stress of industrial needles.

  • Geotextiles & Water Transport: High-tenacity 1.2D solid fibers are engineered for industrial durability.

  • Apparel: Used in 1.4D to 3D ranges for sportswear, underwear, and casual wear.

2. Hollow Non-Conjugate: Insulation & Moisture Management

Hollow fibers feature a central air-filled core, similar to a tube.

• How it works: The trapped air acts as a thermal barrier, making the material 20% lighter than solid fiber while providing superior warmth.

• Best For: * Bamboo Charcoal Products: Ideal for shoe pads and thermal socks that require odor absorption and heat retention.

  • Thermal Bonding: Used in 6D to 15D ranges to create lightweight padding.

  • Filtration: Coarser hollow grades are excellent for air and medical filters.

3. Hollow Conjugate: Maximum Loft & Bounce

Conjugate fibers are engineered with a 3D spiral crimp, acting like a microscopic spring.

• How it works: The “spring-back” memory allows the fiber to recover its shape instantly after compression.

• Best For: * High-Void Filling: The premier choice for furniture cushions and luxury pillows (7D–15D).

  • Toy Padding: Provides a soft, safe, and durable fill for plush toys.

  • Resin Bonding: Ideal for creating high-loft wadding and batting sheets.

Video

How Pillows Are Made – YouTube

FAQ

1. What do you offer?

We supply a comprehensive range of fibers, including recycled hollow conjugate (both siliconized and non-siliconized) polyester staple fiber, hollow fiber, microfiber, virgin polyester staple fiber, and low-melt fiber.

2. What is it used for?

Our fibers are versatile and widely utilized across both the filling and non-woven industries, providing essential loft, durability, and texture for various consumer and industrial applications.

3. Are you a factory or a trading company?

We are primarily a manufacturer specializing in polyester staple fiber with years of industry expertise. To better serve our clients, we also operate a dedicated trading division that allows us to act as a one-stop solution provider.

In addition to our own fiber production, we source high-quality textile components (such as yarn and low-melt fibers) and finished goods (including foam, pillows, cushions, toys, and down/feather products) to ensure our customers have access to a comprehensive supply chain.

4. Where is your factory location?

To maintain a robust and flexible global supply chain, our manufacturing facilities are strategically located throughout Asia, specifically in Vietnam, China, Malaysia, Thailand, and Indonesia. If you would like to visit one of our sites, please contact your sales representative, and we will be happy to arrange transportation for you.

5. Can you accept free sample?

Yes, we provide free hand samples for quantities under 1 kilogram. Once a price is confirmed, we can prepare and dispatch your sample within 2–3 business days. Please note that while the sample is free, the freight costs are the responsibility of the client.

6. Can you provide ODM service?

Absolutely. We specialize in ODM (Original Design Manufacturing). This means we can customize the material composition, dimensions, quantity, packaging, and branding to meet your specific requirements. Your logo and unique specifications will be integrated into the final product.

7. How about your quality? What’s the minimum order Quantity (MOQ)?

We invite you to place a trial order to experience our quality firsthand. Our standard MOQ is 23,000 kilograms per order.

Regarding pricing, we maintain a no-bargain policy. We believe in transparency and efficiency, so we provide our most competitive offer upfront to save you time and ensure a straightforward procurement process.

8. Can I mix different items in one order?

Yes, for your convenience, we allow for a maximum of two different items to be mixed within a single container.

9. How can you guarantee the product quality?

Quality is the cornerstone of our business. We employ an experienced QC team that monitors every stage of production, from raw material inspection to the final manufacturing process. We utilize a range of advanced testing instruments to ensure our fibers meet strict industry standards.

Our business philosophy is simple: We aim to serve one customer 1,000 times, rather than 1,000 customers once. We prioritize long-term partnerships built on consistent excellence.

10. What’s the payment terms?

L/C at sight, 30% TT in advance are mostly accepted; other terms shall be negotiable by both sides

For more information, please feel free to contact :

Tony Tan

Mobile number: +84 90 466 5251 (Whatsapp/Wechat/Viber/Signal)