Hollow Conjugate Dry Fiber or Hollow Conjugate Non Siliconized Fiber
Stays in Shape: Does not stretch, shrink, or warp; keeps its exact dimensions even under heavy pressure.
Better Blending: High-friction surface bonds perfectly with cotton or wool, staying stable during manufacturing.
Lightweight Warmth: Hollow fibers trap air to provide a strong thermal barrier without adding weight.
Clean & Durable: Naturally repels moisture, mold, and bacteria to prevent odors and extend product life.
PRODUCT DETAIL
In the specialized landscape of synthetic fiber manufacturing, the finish applied to a fiber is just as critical as its denier or structure. Hollow Conjugate Dry fiber represents a vital category of Polyester Staple Fiber (PSF) that serves industries where high friction and superior bonding are required. Unlike its siliconized counterparts, which are prized for their “slick” and soft touch, Dry HC fiber is engineered with a “harsh” or high-friction surface. This characteristic makes it the essential raw material for the production of thermal-bonded wadding, needle-punched non-wovens, and industrial-grade padding.
Produced in the high-capacity manufacturing centers of South East Asia and China, Hollow Conjugate Dry fiber is manufactured directly from PTA and MEG or high-grade PET chips. For manufacturers prioritizing sustainability, it is also available as a recycled product made from post-consumer PET bottles. Whether virgin or recycled, the 7D and 15D dry specifications provide the structural foundation for products that must maintain their integrity under heavy industrial use.
Difference between Hollow Conjugate Dry 7D and 15D ?
The choice between a 7D and 15D specification depends entirely on the required density and resilience of the final application. The 7 Denier (7D) fiber offers a finer profile, often used in applications where a balance between softness and structural stability is needed. In contrast, the 15 Denier (15D) fiber is a robust, high-density option designed for maximum support. Because these fibers are “Dry,” they do not contain the silicone coating that typically makes fibers slide past one another. This lack of lubrication is a strategic advantage in manufacturing processes that involve heat or mechanical interlocking.
The “Hollow” and “Conjugate” engineering remains consistent across these grades. Each fiber features a hollow core to trap air and a three-dimensional spiral crimp. This combination ensures that the material provides excellent loft and thermal insulation while maintaining a high degree of “bounce-back” resilience. For the furniture and construction sectors, this translates to a product that provides firm support without the slippery feel of siliconized fills.
The Role of Hollow Conjugate Dry Fiber in Industrial Bonding
One of the primary reasons manufacturers choose Hollow Conjugate Dry fiber is its superior compatibility with bonding agents and low-melt fibers. In the production of thermal-bonded wadding, dry fibers allow for a stronger chemical and mechanical bond. Because there is no silicone barrier on the surface of the 7D or 15D filaments, heat-activated binder fibers can “grip” the conjugate structure more effectively. This results in a more cohesive and durable web that will not separate or “migrate” over time.
This makes Dry HC fiber the preferred choice for the Non-Woven Industry. In processes like needle-punching, the higher friction of the dry fiber ensures that the needles can successfully interlock the filaments into a dense, stable mat. This technology is fundamental in the creation of automotive felts, geofabrics, and heavy-duty interlinings where structural strength is the most important performance metric.
Five Strategic Advantages of Hollow Conjugate Dry PSF
For procurement directors evaluating 7D and 15D Dry HC fiber for their lines, there are five key technical advantages that set this material apart:
Enhanced Dimensional Stability Polyester staple fiber does not warp. It neither stretches nor shrinks, and the lack of a slick finish ensures that the fibers stay in their designated position within a padding or wadding sheet. This resilience ensures that industrial products maintain their exact dimensions even under extreme pressure or environmental stress.
Superior Mechanical Bonding Dry fiber can be effectively combined with other materials such as cotton, wool, or binder fibers. This increases the quality of the final product and allows for a multiplicity of uses in the upholstery and construction sectors. The high-friction surface ensures that these blends remain stable during the carding and lapping processes.
Lightweight Volume and Thermal Insulation The hollow construction of the 7D and 15D grades ensures that the material remains lightweight, which is critical for the weight-sensitive automotive sector. Despite being light, the trapped air within the fibers provides an excellent thermal barrier, wrapping warm air and isolating cold air to maintain consistent temperatures.
Hydrophobic and Antimicrobial Properties Polyester naturally absorbs less moisture, which allows it to repel fungus, mold, and bacteria. In industrial applications like cleaner filters or geotextiles, this prevents the generation of bad odors and inhibits the destruction of the material by environmental factors, extending the product’s service life.
High Filling Power and Resilience The 3D conjugate crimp provides an excellent “spring-back” memory. Even without silicone, the 15D dry fiber offers massive filling power, allowing manufacturers to achieve a firm, supportive loft in sofa cushions and mattresses that siliconized fibers cannot match.
Manufacturing Excellence: From PET Chips to High-Density Fiber
The production of Hollow Conjugate Dry fiber is a high-precision polymerization process performed at high temperature and pressure. The journey from raw material—whether virgin PTA/MEG or recycled PET flakes—to the final 7D or 15D staple involves high-speed spinning and drawing to align the molecular chains for maximum tenacity.
After the spinning process, the polymer is cut into precise staple lengths, such as 32mm, 51mm, or 64mm. These staple fibers are then baled and shipped to factories in South East Asia, China, and beyond. Because they are “Dry,” these fibers are remarkably easy to be carded and are particularly good at bonding with low-melting fiber to create specialized wadding for the furniture and clothing industries.
Direct Applications of 7D and 15D Dry HC Fiber
Because of its unique “Dry” finish, this fiber is the material of choice for several high-demand industrial sectors:
Furniture and Bedding: Used as the primary fill for firm sofa cushions, hard mattresses, and heavy-duty furniture padding where support is more important than silkiness.
Automotive Interiors: Ideal for seat cushions, headrests, and sound-insulation felts where the material must bond with interior resins.
Non-Woven and Wadding: The foundational fiber for spray-bonded cotton, polyester wadding, and interlining for high-performance winter wear.
Filtration and Geotextiles: Used in cleaner filters and civil engineering fabrics where high tenacity and chemical resistance are required.
Conclusion: The Industrial Choice for Strength and Stability
Hollow Conjugate Dry 7D and 15D fiber represents the essential backbone of the industrial textile market. Its ability to provide firm support, superior thermal insulation, and exceptional bonding compatibility makes it the most versatile and cost-effective material for manufacturers focused on durability. By sourcing high-quality dry PSF from the advanced hubs of South East Asia and China, brands can ensure they are delivering products that are technically superior, environmentally responsible, and engineered for the most demanding applications.
Technical Parameter
Polyester Staple Fiber used in Non-woven Industry
| Luster | Denier | Cross Section | End-Use |
| SD | 1.5, 1.7, 2, 3, 4, 6 & 15 | Solid | Nonwoven Interlining, Sanitary Material, Microfiber and Thermal Bonding |
| FBR (Black) | 1.5, 1.7 & 3 | Solid | Needlepunch, Resin Bonding & Fiberfill |
| SD | 1.5 & 4.5 | Solid | Dyeable Fabric & High-Pile |
| SD | 6, 8 & 15 | Hollow and Hollow-Siliconized | Resin Bonding, Needlepunch, Fiberfill, Flame Retardant Fabric, Anti Bacteria & Platinum Photon Fiber |
| SD, BR,OBBR | 0.7, 1.1, 1.2, 1.4, 2.0, 6, 8, 12, 15 & 20 | Solid | Low Pilling, Knitting, Fiberfill, Thermal Bonding, Needlepunch, Infrared Fiber & Resin Bonding |
| SD | 2, 3, 4.5, 7, 12 & 15 | Hollow Conjugate | Resin Bonding, Needlepunch & Fiberfill |
| SD | 7 | Hollow Conjugate | Anti-Bacteria |
Polyester Staple Fiber as per Direct End Use
| Type | Denier | Section | End Use |
| Anti Pilling | 1.4, 1.5, 2, 2.5 & 3 | Solid & Hollow | Sportswear, Underwear, Casual wear |
| Bamboo Charcoal | 1.5, 1.7 & 6 | Hollow | Bedding, Shoe pad, Cushion, Thermal Sock |
| Spinning Use | 1.3, 1.4, 1.5 & 1.7 1.5 | Solid Hollow | Sportwear, Casual Wear, Underwear |
| Dopedyed Black | 1.5, 2 & 3 | Solid | Nonwoven, Casual wear, Sport wear, Underwear |
| Flame Retardant | 1.4 | Solid | Home, Comfort & Clothing textiles |
| Micro Fiber | 0.8 – 1.0 | Solid | Cloth & Fleece |
| High Tenacity | 1.2 | Solid | Yarn, Cloth & Water transport |
| High Void Conjugate | 3, 7, 12 & 15 | Hollow | Toy Padding, Badding, Furniture Cushion, etc |
| Regular Fiber | 2, 2.5, 3, 6 & 15 | Solid | Nonwoven, Filter medics, Padding, etc. |
FAQ
1. What do you offer?
We supply a comprehensive range of fibers, including recycled hollow conjugated (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)
