Importance

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Abstract

The core/casing-fibre consists of plastic such as polypropylene, polyethylene or a mixture of these raw materials or other thermoplastic polymers. The fibre diameter is 0.15 to 2.0 mm and the core/casing-fibre in a continuous or intermittent manner has a structured surface. This is produced by an embossing (5) which designed in a single-sided or multi-sided manner, and its depth is at least 10% of the average fibre diameter. The embossing (5) may be designed in a transverse or diagonal manner or in another shape to the fibre course, but in any case is incorporated after a stretching of the fibre by the factor 5 to 15. The core/casing-fibre is cut in section of 10 to 80 mm and grouped together into bundles of several thousand and wrapped in a water-soluble plastic film. Such fibres are used for increasing the tensile strength, for improving the post-failure behaviour or generally for the mechanical reinforcement in cement-bonded building materials, in particular concrete. The bundles may be worked into the building material together with the plastic film without any disadvantages.

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First Claim