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Fiber production: spinneret filters

Melt filtration in the spinneret using GKD spin pack screens

High‑quality chemical fibers can only be produced from a clean, homogeneous polymer melt. Melt filtration upstream of the spinneret removes gel particles, agglomerates, and hard foreign particles. It reduces gels and therefore forms the basis for minimizing filament breaks and increasing the service life of the spinning block.

Spin pack screens made from metallic filter meshes by GKD provide a precise, ultra‑clean, and reproducible filtration foundation for both mono‑ and multifilament processes using polymers such as PET, PA, and PP.

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Practical challenges

Incomplete polymer melt residues, thermally aged particles, filler agglomerates, or foreign particles lead to filament breaks, surface defects, and spinneret blockages. What is needed are filter media with a defined pore structure and low tendency to clog, while at the same time providing long service life.

GKD Solutions

GKD manufactures and develops spin pack screens made from precisely woven stainless steel wire meshes. The screens are assembled as layered screen packs with graduated layers, e.g., combinations of square mesh and optimized twilled weaves, which are matched to the differential pressures occurring in the process.

Fineness and shear: Depending on the polymer and the system, the filter media are selected based on the required fineness and the necessary shear of the polymer.

Flow and pressure: Optimized weave types minimize differential pressure while providing high separation efficiency, ensuring uniform pressure distribution across the entire screen cross‑section
Material and resistance: Stainless steel grades as well as nickel or nickel‑based alloys for increased corrosion resistance
Cleanliness and quality: Screens made from repeatedly cleaned meshes, delivered particle‑free, with documented quality assurance
Customization: Geometry, construction, edging, and overall design tailored precisely to the specific system

Technical features

Materials: Stainless steel, optionally nickel and special alloys
Mesh types: Square meshes, optimized twilled weaves, multilayer laminates with support layers, metal fiber fleeces
Pores and mesh sizes: Fine to coarse gradations in screen packs, depending on the application
Temperature and chemical resistance: Suitable for typical spinning conditions of PET, PA, PPS, cellulose‑based polymers, and specialty polymers
Designs: Round, ring‑shaped, oval, or customer‑specific contours; clean cut edges; flat‑lying; edged or spot‑welded

Benefits for operators

Consistent filament quality: Homogeneous melt, reduced gel points, fewer filament breaks
Process reliability: Stable differential pressures, reduced spinneret clogging, predictable service life
Cost efficiency: Fewer shutdowns and less scrap, longer screen‑change intervals, lower energy consumption due to optimized pressure losses

Typical application areas

Mono- and multifilament, staple fiber, and yarn production
Polymers: PET, PA, PP, cellulose‑based polymers, and specialty polymers
Process steps: Spinneret filtration and screen changers (as central filters)
Extended applications: Filtration in spinning processes with higher recyclate content; handling of fluctuating raw material qualities

Your next step

Achieve reproducible filament quality with GKD spin pack screens. Our experts support you in optimizing your existing screens in terms of both quality and cost efficiency.