This paper aims to study the application of various types of high-strength fibres in the recycled polyvinyl butyral matrix, esp. effects of sizing on properties of differently sized. For the verification of tensile test according to standard DIN EN 527-1 we used numerical results. The reinforced material was moulded and the fibres are inserted at a distance of 3 mm and 5 mm at the middle of the matrix and subsequently again at 150 °C by 10MPa and by the pressing time, 2 minutes pressed.
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