Spinnerets

POY & FDY Filament

Hole to hole flow consistency, plate pattern, quench exposure and target Linear Density.

BCF & Industrial Yarn

Throughput, filament profile, pressure stability and robust cleaning practice.

Staple Fibre

High hole count, distribution across the active area and repeatable capillary condition.

Monofilament & Specialty

Application specific diameter or profile, material compatibility and surface finish.

Melt Spinning

Molten polymer extruded and solidified by cooling in air, water or another cooling medium.

Polymer rheology, temperature, capillary flow, die swell, quench pattern and throughput per hole.

Dry Spinning

Polymer solution extruded into heated gas while solvent is removed.

Solution compatibility, transition quality, hole profile, residence behaviour and solvent service material selection.

Wet Spinning

Polymer solution extruded directly into a coagulation bath.

High hole count, bath compatibility, jet stability, plate layout and corrosion resistant metallurgy where required.

Dry Jet Wet / Air Gap

Solution passes through an air gap before entering the coagulation bath.

Uniform capillaries, jet path, air gap stability, plate alignment and controlled solution delivery.

Melt

Polyester, polyamide, polypropylene, polyurethane and other melt spinnable polymers.

Dry

Acetate, acrylic, elastomeric and other compatible solution spun systems.

Wet / Air Gap

Rayon, acrylic, PAN precursor, aramid and other coagulation spun systems.

Round

General textile, industrial, staple and monofilament duties.

Tri lobal / Multi lobal

Modified lustre, cover, bulk, capillary channels or optical effects.

Hollow / Segmented

Lower apparent density, insulation, bulk or fluid transport functionality.

Flat / Ribbon / Slot

Surface area, flexural response, reflectance or application specific geometry.

Complex / Multicomponent

Sheath core, side by side, islands in sea or other engineered structures requiring matched polymer paths.

Diameter / Flow Area

Changes average velocity, shear and pressure requirement at a given throughput.

Can the target mass flow per hole be achieved within the approved pressure window?

Capillary Length / L/D

Changes pressure loss and the degree of flow development before the exit.

Does the profile remain stable and cleanable for the selected polymer?

Entry Transition

Influences acceleration, local shear and potential stagnation at the passage entrance.

Is the transition smooth, concentric and reproducible across the plate?

Polymer Viscosity

Changes pressure, shear stress, swell and sensitivity to temperature or residence time.

Which viscosity, IV/MFI or solution concentration basis governs the design?

Throughput Per Hole

Directly changes mass flow, jet velocity and downstream attenuation demand.

Is throughput defined per pack and per active capillary?

Temperature

Changes viscosity, relaxation and degradation risk.

Are normal, start up and maximum temperatures documented?

Capillary Size and Length

Verify tolerance, measurement method, sampling or 100% inspection and acceptance level.

Profile Symmetry and Orientation

Control widths, radii, angles, segment spacing and rotational position for irregular holes.

Entry and Transition

Check concentricity, surface condition and absence of machining damage or contamination.

Exit Face Condition

Confirm clean edges without burrs, dents, scratches, deposits or polishing damage.

Hole to Hole Consistency

Assess reproducibility across the active spinning area and identify plugged, worn or deformed capillaries.

Base Material

Strength at operating temperature, corrosion compatibility, machinability and dimensional stability.

Surface Condition

Specified working face, entry, transition and capillary finish; mirror, honed or other finish only where technically justified.

Plate Form

Circular, annular, rectangular, segmental or custom geometry to the verified pack interface.

Thickness and Support

Pressure loading, stiffness, seating and deflection risk across the active area.

Sealing and Location

Outside diameter/profile, lands, shoulders, bolt pattern, keys, orientation and gasket interface.

Cleaning Compatibility

Thermal, chemical, ultrasonic, hydrolytic or mechanical methods must not attack the alloy or precision surfaces.

Traceability

Material identification, drawing revision, serial or batch marking and agreed inspection documentation.

Linear Density – Decitex / Denier

Flow area and condition differences can change relative mass flow between holes.

Total Decitex / Denier is governed mainly by mass throughput and take up; compare both average and variation.

Filament Evenness

Hole to hole dimensional variation, deposits or partial blockage can disturb filament consistency.

Monitor package to package and within package mass variation under stable process conditions.

Cross Section and Profile Degree

Capillary outline and transition establish the nominal shape.

Final profile also depends on swell, drawdown, quench and solidification.

Tenacity

Non uniform filaments or defects may contribute to weak filaments and breaks.

Tenacity is indirect: polymer molecular condition, orientation, crystallinity and draw history are decisive.

Elongation

Flow or quench non uniformity can contribute to inconsistent draw response.

Elongation is indirect and must be assessed with the same draw and heat setting conditions.

Breaks / Operability

Burrs, contamination, plugged holes or unstable profiles can disrupt jet formation.

Record break rate, drip, smoke, pressure trend and affected hole positions during trials.

Appearance / Dye Uniformity

Cross section or mass flow variation can change optical response and downstream behaviour.

Correlate spinneret findings with dyeing, lustre, streaks and fabric inspection; other causes must also be excluded.

Incoming Condition

Record plate identity, drawing revision, service history, contamination and visible damage.

Cleaning Route

Define thermal / chemical / ultrasonic / mechanical stages, limits, rinsing and drying for the actual polymer.

Post Clean Inspection

Check every critical hole where required; verify face, transition, size / profile and residue status.

Repair Decision

Approve re polishing, deblocking or capillary repair only against documented dimensional limits.

Retirement Criteria

Remove plates with out of tolerance holes, cracks, excessive wear, distorted seating or unrecoverable damage.

Storage and Handling

Protect precision faces and capillaries from impact, corrosion, dust and mixed identity.

Approved Drawing

Revision, material, dimensions, datum system, hole profile, layout, tolerances and finish.

Material Record

Grade and certificate level where specified in the order.

Dimensional Report

Critical external dimensions, thickness, locating and sealing features.

Capillary Inspection

Method, acceptance basis and results for size/profile, length, symmetry, orientation and condition.

Visual / Face Inspection

Entry, exit, working faces, markings and absence of damage or contamination.

Identification and Packing

Part number, drawing revision, lot/serial identity and protection of precision surfaces.

01

Spinning route: melt, dry, wet or dry jet wet / air gap.

02

Polymer or solution, grade, additives, viscosity basis and operating temperature.

03

Product duty: POY, FDY, BCF, industrial yarn, staple, monofilament or speciality.

04

Total throughput, number of active packs and throughput per capillary.

05

Filament count, target Decitex / Denier and required cross-section/profile degree.

06

Capillary diameter / profile, length / L/D, entrance geometry and orientation.

07

Plate shape, outside dimensions, thickness, support and sealing interface.

08

Hole count, pitch, arrangement, active area and relationship to the quench field.

09

Material, hardness, surface finish, corrosion and cleaning requirements.

10

Approved drawing/sample, inspection plan, acceptance limits and documentation.

Fit And Sealing

Assembly, orientation, seating, leakage and removal condition.

Confirms machine interface and handling.

Pressure And Throughput

Start up, steady state and trend at controlled temperature and polymer condition.

Checks flow resistance and operational stability.

Filament Formation

Active holes, drip, smoke, profile stability, breaks and affected positions.

Identifies local capillary or process interaction.

Linear Density / Evenness

Average dtex/denier, variation and package to package consistency.

Confirms mass flow and process repeatability.

Tensile Properties

Breaking force/tenacity and elongation using the agreed method.

Confirms final product against the same downstream conditions.

Cross Section / Appearance

Microscopy, profile degree, lustre, dyeing or fabric result where relevant.

Links geometry to the commercial product objective.

Geometry and Fit

Approved drawing or verified sample, machine interface, sealing, orientation and active area.

Capillary Design

Profile, diameter/slit width, length/L/D, entry transition, count, pitch and layout.

Material and Finish

Selection against polymer/solution chemistry, temperature, pressure, cleaning and service life target.

Verification

Agreed dimensional, visual and capillary inspection with defined acceptance criteria.

Qualification

Plant trial plan covering fit, pressure, throughput, operability, filament geometry and product quality.

Supply Documentation

Quotation, approved specification, inspection records, identification, packing and delivery schedule.