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What is "Dry Spinning" - Definition & Explanation
Last Updated on: 02-Mar-2023 (1 year, 2 months, 28 days ago)
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Magic of Dry Spinning: Creating High-Performance Fibers


Dry spinning is a specialized technique used in the textile industry to produce synthetic fibers. It involves the extrusion of a polymer solution through a spinneret, followed by solidification through the evaporation of solvents. This process creates fine, continuous filaments that are then collected and further processed into various textile products. This article provides a comprehensive understanding of dry spinning, including its history, types, tips for handling, and profiles of top international users and manufacturers.

History and Origin

Dry spinning has its roots in the early 20th century when scientists began exploring methods to produce synthetic fibers as alternatives to natural fibers. The technique emerged as a solution to produce synthetic fibers that were not suitable for wet spinning methods. Dry spinning gained significant attention and development during World War II, when the demand for synthetic fibers increased due to shortages of natural fibers. Nylon, one of the first commercially successful synthetic fibers, was produced using dry spinning, paving the way for further advancements in the field.

Types of Dry Spinning

Dry spinning encompasses several variations, each suited for specific polymer types and desired fiber properties:

  1. Acetate Dry Spinning: This process involves the use of cellulose acetate as the polymer, which is dissolved in a solvent before being extruded and solidified. Acetate fibers produced through dry spinning are known for their softness, drapability, and ability to retain color.
  2. Acrylic Dry Spinning: Acrylic fibers are produced through dry spinning by dissolving acrylonitrile copolymers in a solvent. The resulting fibers possess high strength, excellent thermal resistance, and a wool-like appearance, making them popular for various applications.
  3. Modacrylic Dry Spinning: Modacrylic fibers are a modified form of acrylic fibers, combining acrylonitrile and other monomers. They are known for their flame resistance, heat stability, and low shrinkage properties.
  4. Polyester Dry Spinning: Polyester fibers are produced through dry spinning by dissolving the polyester polymer in a solvent and solidifying it through evaporation. Polyester fibers are highly versatile, offering exceptional strength, durability, and resistance to wrinkles and abrasion.

Tips for Handling Dry Spun Fibers

Handling dry spun fibers requires specific considerations to maintain their quality and performance:

  • Proper Storage: Dry spun fibers should be stored in a cool, dry environment to prevent moisture absorption, which can degrade their properties.
  • Protection from Heat: Excessive heat exposure can cause melting or deformation of dry spun fibers. It is important to avoid direct contact with high heat sources.
  • Gentle Handling: Dry spun fibers are often delicate and can be susceptible to breakage. They should be handled with care to avoid unnecessary tension or stress.
  • Cleaning Instructions: Each type of dry spun fiber may have specific cleaning requirements. It is important to follow the manufacturer's instructions or consult professionals for proper cleaning methods.

Top International Users and Manufacturers

Dry spun fibers are widely used by various international brands in the textile industry. Here are some of the top users and manufacturers:

  1. DuPont: DuPont, a global leader in the chemical industry, has been a significant player in dry spinning technology. They have pioneered the production of nylon and polyester fibers through dry spinning, supplying materials to numerous industries worldwide.
  2. Eastman Chemical Company: Eastman is a prominent manufacturer of specialty materials, including fibers produced through dry spinning. Their extensive portfolio includes acetate and modacrylic fibers used in various applications such as apparel, home textiles, and industrial products.
  3. Kaneka Corporation: Kaneka is a Japanese company renowned for its innovation in dry spinning processes. They specialize in acrylic and modacrylic fibers, catering to industries such as fashion, automotive, and protective clothing.
  4. Toray Industries: Toray Industries is a multinational corporation that produces a wide range of fibers, including polyester fibers produced through dry spinning. Their products are utilized in diverse sectors, including apparel, automotive, and healthcare.
  5. Lenzing AG: Lenzing is a leading manufacturer of cellulose fibers, including acetate fibers produced through dry spinning. Their sustainable fibers find applications in clothing, home textiles, and personal care products.

Conclusion

Dry spinning is a vital technique in the textile industry, allowing the production of high-performance synthetic fibers with unique properties. It has evolved over the years, enabling the development of various fiber types and finding applications in diverse industries. Understanding the history, types, and handling tips associated with dry spinning provides valuable insights into the complex world of textile manufacturing and the global brands driving innovation in this field.


Dry-spinning
Dry spinning uses a solvent that evaporates in air. The dissolved polymer is extruded through the spinnerette into a chamber of heated air or gas, the solvent evaporates, and the fibre forms. The solvent is generally recovered for reuse. Acrylic is produced by dissolving the polymer in dimethyl formamide before dry spinning. Other fibres formed by dry spinning include acetate, triacetate, spandex, and aramid. The evaporated solvent is drawn upwards by the air stream, for collection and recycling, but almost impossible to contain all solvent within system.
Dry Spinning
In the dry spinning process, polymer is dissolved in a solvent before being spun into warm air where the solvent evaporates. This leaves the fibrous polymer ready for drawing.

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