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Kapok Fiber: Properties, Processing and Applications

Kapok or capok is a natural, cellulosic fiber. It is obtained from the seed hairs of kapok trees (Ceiba pentandra). Kapok is also called as silk cotton or java cotton. It is smooth, lightweight, unicellular, cylindrically shaped, hollow body, and very buoyant, and twist less fiber. But it quickly breaks down. Kapok fibers on its own are not suitable for spinning into yarn. Cause is very smooth, slippery and brittle. Therefore, fiber is difficult to spin into yarns

The specialty of the kapok fibre is, its yellowish color or light-brown with a silk-like luster. In contrast to the cotton fiber, the kapok fiber has single-celled plant hairs. This fiber is conventionally used as stuffing for insulation against sound and heat, and for bedding, life preservers, and other water safety equipment, sowing to its hollow air-filled lumen and high void content. Because of its excellent buoyancy. Due to have some unique features, kapok fiber-based materials have created area of opportunities in the various application fields.

We will be discussed below, everything of kapok fibre properties to applications.

Fig: Representative relationship between structure, properties, and applications for kapok fiber

Structure of Kapok Fiber:

Kapok fiber are homogenous circular cross section with wide air-filled lumen. Air filled lumen has wall thickness about 1-2μm. As a result, its cell wall is thin and covered with a thick layer of wax. Kapok fibers are found transparent with characteristic air bubbles in the lumen by the microscope observation. The cross section of kapok fibers is oval to round.

 

All process are described briefly

  1. Harvesting: The ripe unopened pods are normally harvested by knocking them off the tree. But it can also be cut from the tree or harvested when fall to the ground.
  2. Removing hulls: Kapok fiber is left in sunlight for drying of hulls. The fruits are hulled and seed and fibers are removed from the pods by hand.
  3. Removing seeds: The seeds lie loose in the floss and, with the help of some beating they fall to the bottom of the container where they are easily separated.
  4. Drying: Kapok fiber is dried under the sun for 3 -5 hours to complete drying.
  5. Bailing and packing: Kapok fibers are then packed in the form of bales and dispatched for further processing.

Properties of Kapok Fiber

Component of Kapok:

  1. Cellulose: 64%
  2. Pentose: 23%.
  3. Lignin: 13%

Advantages of Kapok Fiber:

  1. Light Weight.
  2. Hydrophobic and the good buoyancy effect.
  3. Thermal insulator.
  4. Bio degradable, etc.

Disadvantages of Kapok Fiber:

  1. The fibers are fragile and break easily.
  2. Irritant to lungs and needs extra care during work.
  3. Not suitable for weaving or spinning.
  4. Highly inflammable, etc.

End Uses of Kapok Fiber:

  1. Mattress or Pillow stuffing.
  2. Life-saving equipment.
  3. Yachts and boats furnishing, insulating materials in refrigeration systems.
  4. Construction of thermally insulated and sound proof covers and walls.
  5. Substitute of cotton in surgery.
  6. By products such as Kapok seed oil, and so on.

Special Applications of Kapok Fiber:

  1. Apparel Textiles:Once kapok fibre was considered unfit for textile fabrics. However, the weave-ability of kapok can be enhanced by blending with other fibers. Kapok fabric has met the basic requirements on apparel textiles, showing better performance than cotton fabric in some features such as: air permeability, durability, warmth retention, especially the warmth retention of plain-woven kapok fabric.
  2. Acoustical Material:Noise pollution is the excessive noise which borrow heavy damage and great stress on the activity and balance of human. Consequently, it is very important to develop economical and eco-friendly acoustical materials to control the noise pollution. Special structure of kapok is beneficial to the sound absorption. Due to kapok fiber has large lumen and thin cell walls, it increases the chance of friction between sound waves and fibers. Consequently, kapok fiber has excellent acoustical damping performance.
  3. Oil-Absorbing Materials:Over the production, storage, and transportation of oils are always possible risks of oil spillage. Oil spills often result in immediate and long-term environmental damage. To this minimize environmental issues some oil spill remediation products have been developed for the cleanup and recovery of oil spills. But this synthetic material will present serious environmental issues due to their non-biodegradable characteristics. Kapok fiber is a natural, inexpensive, hydrophobic–oleophilic agricultural product. It is considered to be a better alternative to the widely used synthetic materials. Kapok fibre exhibits high hydrophobic–oleophilic characteristics. This intrinsic nature makes kapok a high oil retentional fiber.

Safimex company has supplying Kapok Fiber with a good price for bulk order. If you are interested in this product, please feel free to contact us at info@safimex.com or click at https://www.alibaba.com/product-detail/Vietnamese-Capoc-For-Stuffed-OEM-Bag_10000014068906.html?spm=a2747.product_manager.0.0.7e4c2c3cFqR2VS

Source: Textile Blog

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