| 摘要 |
<p>A method of manufacturing a building material comprises feeding a shredded plastics material with mineral fines (e.g. limestone) having less than 10 wt. % moisture to a mixer and mixing at elevated temperature. In one aspect of the invention, at least 80 wt. % of the shredded plastics has a particle size of less than 30 mm. In another aspect, the shredded material is a waste plastics material comprising at least 80 wt. % plastics. In a further aspect, the method is characterised by one or more of the following: the fines consist mainly of dust, at least 30 wt. % of the fines have a particle size greater than 63 microns and/or less than 4 mm, the materials are heated to 170-195{C during mixing, and a fire retardant is added to the materials in the mixer.</p> |
