The specimens of a textile floor covering are exposed, at constant load and slippage and for a prescribed number of double passages, to the action of a four-footed wheel (Tretrad), the feet of which are fitted with interchangeable rubber soles.
A Lisson Tretrad machine comprises a bed plate, a vacuum cleaning system and two Tretrad assemblies.
- Determination of mass loss of textile floor coverings, also used to assess fibre bind of synthetic pile carpets
- Determination of stair nosing: appearance change of textile floor coverings
- Determination of fibre bind on synthetic loop pile carpets
- Determination of fibre bind (hairiness) on needled floorcoverings and floor coverings without pile