Synthetic Fibre Testing

A polyester filament with the right diameter but the wrong curvature will behave differently in spinning, texturing and finished fabric. OFDA by Robotic Vision delivers rapid, objective synthetic fibre testing for diameter, curvature and distribution, giving manufacturers and laboratories the data to control fibre properties at every stage from extrusion to end product.

Fibre Curvature and Diameter Measurement for Synthetic Fibres

Curvature is the primary reason synthetic fibre customers choose OFDA. In man-made fibres, curvature directly influences crimp retention, bulk development, fabric handle and processing behaviour. OFDA measures curvature alongside diameter in a single optical imaging run, delivering both metrics from the same sample in seconds. This combination of curvature and diameter data, reported with full distribution statistics, gives synthetic fibre producers a level of process insight that single-metric instruments cannot match.

OFDA technology has been applied to fibre measurement for more than three decades. While originally developed for wool, the optical imaging principle works across fibre types. The OFDA2000 handles rapid diameter and curvature testing on individual samples, and the OFDA4000 provides automated laboratory analysis of slivers with robotic sample handling, measuring 4,000 fibres for length with up to 80,000 simultaneous diameter measurements.

What OFDA Measures on Synthetic Fibres

A single OFDA run captures the core attributes that drive synthetic fibre performance and processing behaviour. Every result is reported with full distribution data, not just a mean, so quality teams and R&D can work from the complete picture.

Mean fibre diameter, reported in microns
Full fibre diameter distribution and standard deviation
Coefficient of variation across the sample
Fibre curvature, reported in degrees per millimetre
Curvature distribution for crimp uniformity assessment
Fibre length distribution for slivers on OFDA4000

Why Curvature Matters in Synthetic Fibre Production

In natural fibres, curvature relates to crimp character and handle. In synthetic fibres, curvature is an engineered property that determines how the fibre performs during processing and in the finished product. Texturised polyester, crimped nylon and heat-set acrylic all depend on controlled curvature for their bulk, recovery and tactile properties.

OFDA measures curvature on thousands of fibre snippets per sample, reported in degrees per millimetre. This provides manufacturers with:

Process verification: confirm that texturising, crimping or heat-setting is delivering the target curvature profile
Batch consistency: detect curvature drift between production runs before it reaches downstream processing
Product development: quantify the effect of process changes on curvature alongside diameter
Specification compliance: report curvature and diameter together for customer and internal specifications

Synthetic Fibre Types Measured With OFDA

OFDA's optical measurement principle works regardless of fibre polymer type. The instrument captures fibre cross-sections optically and analyses diameter and curvature from the image data, which means the same platform handles multiple synthetic fibre types without reconfiguration.

Polyester Fibre Testing

Polyester is the most widely produced synthetic fibre globally. OFDA supports diameter and curvature measurement on both staple and textured polyester, providing the distribution data that producers need for process control, incoming material verification and product development. Curvature measurement is particularly relevant for textured polyester where crimp retention and bulk are critical performance attributes.

Nylon Fibre Testing

Nylon fibres are used in applications ranging from apparel to technical textiles, and fibre diameter consistency directly affects tensile performance, dye uptake and fabric uniformity. OFDA provides rapid diameter and curvature data for nylon staple fibres, supporting quality control at the point of production and incoming verification at the mill.

Acrylic Fibre Testing

Acrylic fibres are valued for their wool-like handle, and curvature is central to achieving that character. OFDA measures both diameter and curvature on acrylic fibres, giving producers the data to verify that crimping processes deliver the target profile and that finished fibre meets specification for softness, bulk and processing behaviour.

Other Synthetic and Blended Fibres

OFDA can be used to measure a wide range of man-made fibres beyond the major types, such as polypropylene, aramid and recycled synthetic staple. For blended products containing synthetic and natural fibres, OFDA provides diameter and curvature data that supports blend verification and quality assurance. Contact Robotic Vision for free sample testing to confirm OFDA's suitability for your specific fibre type.

Synthetic Fibre Testing Across the Value Chain

OFDA supports measurement at multiple points in the synthetic fibre value chain. Using a consistent optical method from production through to finished product gives manufacturers, processors and customers comparable data throughout the chain.

Fibre production: verify diameter and curvature at extrusion, texturising or crimping
Incoming material verification: test staple fibre against purchase specification before processing
Process control: monitor diameter and curvature consistency across production runs
Product development: quantify the effect of process trials, new polymers or finish treatments
Customer specification: generate objective data for technical data sheets and customer reports

OFDA Instruments for Synthetic Fibre Testing

OFDA2000 for Synthetic Fibre QA

OFDA2000 is a rapid instrument suited to diameter and curvature testing on individual synthetic fibre samples. It delivers results in seconds and is used in both production facilities and laboratories for quality assurance, incoming material checks and specification verification.

For synthetic fibre customers, OFDA2000 is typically the primary instrument because curvature and diameter QA on individual samples is the core use case.

OFDA4000 for Laboratory Analysis

OFDA4000 is a fully automated laboratory instrument for slivers and high-throughput fibre analysis. Robotic sample handling combines with optical imaging to capture diameter and true length distribution in the same run. The OFDA4000 measures 4,000 fibres for length, with up to 80,000 diameter measurements taking place simultaneously.

For synthetic fibre laboratories processing large sample volumes or requiring length distribution data, OFDA4000 provides the throughput and automation to keep pace with production.

Why Choose Robotic Vision for Synthetic Fibre Testing

Curvature and diameter from a single sample in seconds
Full distribution reporting, not just a mean, for specification compliance
Works across polyester, nylon, acrylic and other synthetic fibre types
Same proven optical technology used across natural and synthetic fibre industries
Long-lasting calibrations with simple, documented procedures
Direct factory support backed by a global agent network
Free sample testing available to confirm suitability for your fibre type

Explore OFDA Synthetic Fibre Testing Instruments

Whether you need rapid curvature and diameter QA on the production floor or high-throughput laboratory fibre analysis for multiple product lines, Robotic Vision has a configuration to match. Contact the team to discuss your synthetic fibre testing requirements, or send up to six samples for a free report and results.

Frequently Asked Questions

OFDA measures mean fibre diameter, full diameter distribution, standard deviation, coefficient of variation and fibre curvature on synthetic fibres. OFDA4000 also measures true fibre length distribution in slivers. All outputs are generated from a single optical imaging run, giving manufacturers and laboratories a complete objective profile of the fibre including both diameter and curvature data in the same measurement.
Curvature is the primary reason synthetic fibre customers use OFDA. In man-made fibres, curvature is an engineered property that determines crimp retention, bulk development, fabric handle and processing behaviour. Texturised polyester, crimped nylon and heat-set acrylic all depend on controlled curvature. Measuring curvature alongside diameter provides a more complete picture of fibre performance than diameter alone.
Yes. OFDA's optical measurement principle works regardless of fibre polymer type. The instrument captures fibre cross-sections optically and analyses diameter and curvature from the image data. Polyester, nylon, acrylic, polypropylene and other synthetic fibre types can all be measured on the same platform without reconfiguration. Robotic Vision offers free sample testing to confirm suitability for specific fibre types.
OFDA2000 is a rapid instrument suited to diameter and curvature testing on individual samples for quality assurance, and is typically the primary choice for synthetic fibre customers. OFDA4000 is a fully automated laboratory instrument for slivers, measuring 4,000 fibres for length with up to 80,000 simultaneous diameter measurements. The right choice depends on whether your testing programme requires sliver length and diameter analysis or focused diameter and curvature QA on individual samples.
OFDA delivers full diameter and curvature distribution data in seconds, allowing quality teams to verify production output against specification, detect process drift between batches and confirm incoming material before downstream processing. Distribution data (SD, CV) is often more valuable than the mean alone because it reveals batch variability and distribution tails that affect processing performance and finished product consistency.
Yes. OFDA measures fibre curvature in the same run as diameter, reported in degrees per millimetre. Curvature data is computed from the same optical image used for diameter analysis, so both metrics come from a single sample with no additional preparation or handling. This is the core capability that drives synthetic fibre customers to choose OFDA over instruments that report diameter alone.
Yes. OFDA measures the diameter and curvature of the fibres in the sample regardless of whether they are synthetic, natural or blended. For identification of fibre types within a blend, OFDA can be paired with spectroscopic methods such as FT-IR or Raman. OFDA focuses on geometrical metrics (diameter, curvature, distribution), which supports blend verification and quality assurance alongside other analysis techniques.
OFDA reports full diameter and curvature distribution, not just a mean value. This includes standard deviation, coefficient of variation, distribution shape and percentage of fibres falling outside specification limits. For synthetic fibre producers, distribution data is often more important than the mean because it reveals process variability and distribution tails that directly affect processing behaviour, dye uptake uniformity and finished product performance.
Contact the Robotic Vision team or your local OFDA agent to discuss your fibre types, sample volumes and measurement priorities. Robotic Vision offers free sample testing on up to six samples, so you can see results on your own material before making an instrument decision. The team can recommend the right OFDA configuration, outline sample preparation for your fibre type and support installation and method development.