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New use for paper industry's sludge and fly ash in plastics

Date:
February 27, 2017
Source:
VTT Technical Research Centre of Finland
Summary:
Researchers examined whether new industrial applications could be developed for various types of sludge and fly ash generated by the paper and board industry.
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Up to half of oil-based polypropylene can be replaced with paper industry side streams. Plastec Finland Oy and Wiitta Oy made a trial batch of floor tiles and storage containers, of which side-streams accounted for 30%.
Credit: Image courtesy of VTT Technical Research Centre of Finland

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.


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Materials provided by VTT Technical Research Centre of Finland. Note: Content may be edited for style and length.


Cite This Page:

VTT Technical Research Centre of Finland. "New use for paper industry's sludge and fly ash in plastics." ScienceDaily. ScienceDaily, 27 February 2017. <www.sciencedaily.com/releases/2017/02/170227120318.htm>.
VTT Technical Research Centre of Finland. (2017, February 27). New use for paper industry's sludge and fly ash in plastics. ScienceDaily. Retrieved May 26, 2017 from www.sciencedaily.com/releases/2017/02/170227120318.htm
VTT Technical Research Centre of Finland. "New use for paper industry's sludge and fly ash in plastics." ScienceDaily. www.sciencedaily.com/releases/2017/02/170227120318.htm (accessed May 26, 2017).

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