纸业废弃物可注塑或挤出塑料制品，减少聚丙烯使用量。
尽管纸张和纸板生产过程产生的废弃物有时能使用在混凝土中，但是大多数造纸废物最终被倒入垃圾填埋场。然而芬兰国家技术研究中心(VTT)的研究人员已经发现其可以被当作塑料制品的原料，实验室测试，表明造纸废弃物可以取代注塑或挤出塑料复合材料中50％的聚丙烯。通过调整造纸废弃物与聚丙烯的比例，可以调整塑料的强度、刚度、耐热性、外观和表面纹理等特性。到目前为止已经创造了塑料地砖和储存容器，它们由30％的造纸废物组成，如下图所示：
上述对废弃物的再利用，不仅可以避免大量造纸废物被倒入垃圾填埋场，还能降低塑料制品的生产成本，减少所需聚丙烯的用量。研究人员表示，造纸废物也有望被用于制作板条箱和托盘等物品。
详情介绍见这里：
VTT Technical Research Centre of Finland examined, as part of the EU’s Reffibre project, whether new industrial applications could be developed for various types of sludge and fly ash generated by the paper and board industry. Laboratory tests showed that these side streams can replace up to 50% of oil-based polypropylene. They can be used as a raw material in plastic composites made using injection moulding and extrusion.
Large quantities of various side streams are created during the manufacture of paper and cardboard. Part of these can be used instead of natural aggregates as a raw material in concrete or asphalt, or in construction. Large amounts of side streams still end up in landfills and incineration.
Side streams could be used to lower composite manufacturing costs, reduce the environmental impacts of production, and lower the total amount of waste. This would also reduce the production of oil-based plastics.
Laboratory tests showed that 50% of the raw-materials in injection-moulded composite could come from paper and board industry side streams. The amount of side streams has an effect on the product’s properties: strength, stiffness, heat resistance, appearance and the texture of the surface.
During the project, Plastec Finland Oy and Wiitta Oy produced floor tiles and storage containers, of which side-streams accounted for 30%. New applications are continually being sought – in the future, they may include pallets and crates, for example.
The possible legal restrictions still have to be explored prior to the product-specific use of side-streams in composites.
VTT coordinated the Reffibre project (No. 604187), which formed part of the EU’s Seventh Framework Programme, during 2013-2016. In addition to VTT, Technische Universität Darmstadt, Papiertechnische Stiftung, Instituto Tecnológico del Embalaje, Transporte y Logstica, Bumaga BV, Confederation des Industries Papetieres Europeennes CEPI Aisbl, Vrancart S.A. Adjud, Alucha SL, Papierfabrik Utzenstorf AG and Holmen AB participated in the project. The side streams used for the study were obtained from European companies.
资料来源：vttresearch，仅供参考。