Length and diamter of carbon fibres

APPLICATION

Carbon Fibres

Fibre length and fibre diameter analysis of carbon fibres with image analysis

There are various procedures for the production of carbon fibres. In this application, they are obtained from coal tar in a special spinning process. The raw product consists of fibres with lengths in the lower two-digit millimetre range with diameters of at least ~ 10 microns, and has a crimped structure. This leads to strong linking of the raw material, which has high electrical conductivity, good treatability with resins or other binders and additionally excellent thermal insulation. These fibres are used, for example, in high-performance filters, floor coverings, clutches and brakes, as well as composite materials.

Repeatable measuring resulats for fibre length and fibre width

Diagram for particle shape of carbon fibres basing on LEFI
Q1 distribution of the fibre lengths from around 100 microns to 10,000 microns with an average fibre length x50 of around 2,200 microns | Reproducible measurement of three sub-samples

Distribution of the elongation shape parameter

Elongation, in particular, is a useful descriptive shape parameter for fibres that illustrates the ratio of fibre thickness to fibre length and can assume values between 0 and 1. High values close to 1 indicate compact fibres and low values near to 0 indicate long fibres.

  • Improvement of plastic compounds properties
  • Formulation of antistatic and conductive coatings
  • Reduction of the time required in fibre characterisation
  • Reproducible and complete dispersion of entangled fibres
  • High resolution for correctly determining the fibre length and fibre thickness

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Application strengths

  • Rapid and reproducible dispersion and measurement
  • Also powerful with entangled fibres
  • High statistical significance due to several thousand individual fibres per analysis
  • Length-to-thickness ratio > 1,000 possible
  • Reproducible, user-independent results

Customer benefits

  • Timely production inspection thanks to fast fibre characterisation
  • Improvement of physical fibre properties
  • Reduction of production defects
  • Avoidance of operator influences
  • Meaningful and reliable results

Typical configuration

QICPIC + FIBROS

QICPIC + FIBROS

boost:

Image Analysis | Dry
Fibre diameter: 1.8 µm - 5,000 µm
Fibre length: 500 µm - 30,000 µm
Sample amount: 0.5 g - 20 g

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Suited for

Typical applications

Applied for control of