Solution spinning of man-made fibers

Fiber spinning from polymer solutions

Solution spinning is a method used to produce fibers from polymer solutions. In this method, a polymer is dissolved using a suitable solvent to form a solution, which is then extruded through a spinneret, that usually have multiple holes, to form fibers. There are several different types of solution spinning: 

• Wet spinning
• Air-gap (dry-jet wet) spinning
• Gel spinning
• Dry spinning
• Electrospinning

We specialize primarily in wet and air-gap spinning techniques, where a polymer solution is extruded into a coagulation bath containing a liquid that prompts the polymer to solidify, forming fibers. The coagulation bath is typically composed of a non-solvent for the polymer that causes coagulation and solidification.

Why man-made fibers?

Historically, natural fibers like cotton, flax and wool have been extensively used across various applications. However, man-made fibers offer a diverse range of properties and functionalities that may not be available in natural fibers. Man-made fibers can be engineered to have desired properties, such as diameter, length, and strength-elongation profile. Such fibers can exhibit superior durability and performance and be more cost-effective compared to natural fiber. Additionally, man-made fibers can be produced in large quantities to meet the demands of global markets. Examples of man-made fibers produced using solution spinning include viscose and lyocell, cellulose acetate, aramid (Kevlar) and elastane.

Bio-based and recycled fibers

Solution spinning offers a method for producing man-made fibers from a range of bio-based materials, including cellulose, lignin, alginate, chitosan, and proteins. These polymers can be sourced from both primary and secondary (e.g., recycled) raw materials. Chemical recycling of textiles can be achieved by fiber dissolution and subsequent coagulation into man-made fiber, addressing the challenges of textile waste and contributing to a more sustainable textile industry. 

Our offer

Our service portfolio covers comprehensive process development, with a focus on optimization of polymer dissolution, extrusion, coagulation, drawing (stretching), washing, spin finish application, drying, etc. Additionally, our facilities allow processing obtained fibers into staple fibres using crimping and cutting, or as filament yarns. Furthermore, we specialize in spinning these fibers into yarns and tailor them specifically for textile applications. Our services include:

• Formulation and optimization of spinning dopes (polymer solutions).
• Development and scaling-up of wet spinning and air-gap spinning.
• Development of filament and staple fibers.
• Prototyping for textile and composite applications.

We develop man-made fibers and fiber spinning technologies in close collaborate with our customers. We address your needs and deliver customized solutions that meet your requirements. Please contact us for more information.