3D-shapeable thermoplastic paper materials
2013 (English)In: Nordic Pulp & Paper Research Journal, ISSN 0283-2631, Vol. 28, no 4, 602-610 p.Article in journal (Refereed) Published
The purpose of this work was to investigate to what extent it is possible to improve the thermoplastic properties of paper materials so that 3D-shapeable paper products can be manufactured. For that purpose, the addition of various chemical adjuvants, known to improve both tensile strength index and strain at break, was investigated. Adding polylactide latex was found to significantly improve both the tensile strength properties and strain at break of paper materials. To enhance their strainability, the paper sheets were cured at an elevated temperature of 150 degrees C. The improved strainability after curing is hypothesized to relate to the spreading of the polylactide latex (minimum film-forming temperature of 90 degrees C) on the fibre surfaces, improving the relative bonded area. Both the tensile strength index and strain at break improved significantly with no densification of the paper sheets. A second aim was to make double-curved board structures in a hydroforming equipment, using the sheets treated with polylactide latex under various conditions. Double-curved sheets with a nominal strain at break of over 20% could be formed by adding 20% polylactide latex. Hydroforming had to be done at temperatures exceeding the minimum film-forming temperature of the polylactide latex to significantly improve the strain at break during the forming operation.
Place, publisher, year, edition, pages
2013. Vol. 28, no 4, 602-610 p.
Deep-drawing, Hydroforming, Thermoplastic board, Polylactide latex, Bleached kraft pulp, Three-dimensional packaging materials, Tensile index, Strain at break
Paper, Pulp and Fiber Technology
IdentifiersURN: urn:nbn:se:kth:diva-140183DOI: 10.3183/NPPRJ-2013-28-04-p602-610ISI: 000328642400016ScopusID: 2-s2.0-84891841593OAI: oai:DiVA.org:kth-140183DiVA: diva2:688653
QC 201401172014-01-172014-01-172014-11-07Bibliographically approved